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`c19) United States
`
`
`c12) Patent Application Publication
`c10) Pub. No.: US 2008/0315666 Al
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`(43) Pub. Date: Dec. 25, 2008
`
`Von Schonebeck et al.
`
`US 20080315666Al
`
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`(54)SELF-PROPELLED MACHINE FOR CUTTING
`
`OR MILLING, IN PARTICULAR A MACHINE
`(57)
`
`FOR WORKING DEPOSITS BY SURFACE
`MINING
`
`(52)U.S. Cl. ....................................................... 299/39.6
`
`ABSTRACT
`
`(73)Assignee:
`
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`(21)Appl. No.:
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`12/138,116
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`(22)Filed:
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`Jun.12, 2008
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`(30)
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`The invention relates to a self-propelled machine for cutting
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`or milling, and in particular to a machine for working depos­
`(75)Inventors:Winfried Von Schonebeck,
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`its, such for example as deposits of coal, ore, minerals, etc., by
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`surface mining, which has a chassis (1), which is carried by
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`Vettelschoss (DE); Gunter Hahn,
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`Konigswinter (DE)
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`track-laying units or wheels and which has a cutting or mill­
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`ing arrangement (2) and an arrangement (8) for adjusting the
`Correspondence Address:
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`height of the chassis to set the depth of cutting or milling. The
`STERNE, KESSLER, GOLDSTEIN & FOX P.L.
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`machine according to the invention is characterised in that the
`L.C.
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`driver's station (10) is not fixed on the chassis of the machine
`1100 NEW YORK AVENUE, N.W.
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`but on a component (SC) of the height-adjusting arrangement
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`WASHINGTON, DC 20005 (US)
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`
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`(8)which is connected to the chassis in such a way as to be
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`able to move. The basic principle of the machine according to
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`Wirtgen GmbH, Windhagen (DE)
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`the invention is that the driver's station is decoupled from the
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`shaking movements or vibrations from the arrangement (2)
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`for cutting or milling which are transmitted to the chassis, and
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`from the vibrations from the internal combustion engine for
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`driving the machine. This decoupling is accomplished by
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`having the height-adjusting arrangement (8) form a system
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`which connects the track-laying units or wheels to the chassis
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`not rigidly but in such a way that they are able to move. The
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`Jun. 20, 2007 (DE) .................... 102007028812.5-24
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`movable suspension causes the driver's station and the chassis
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`to be decoupled from one another. The means (SD) for adjust­
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`ing the components of the height-adjusting arrangement
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`which are connected to the chassis in such a way as to be able
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`to move cause the system to be damped in this case.
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`Foreig n Application Priority Data
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`
`
`Publication Classification
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`(51)Int. Cl .
`E21C 35/06 (2006.01)
`
`10 A
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`3 2 4 68 7
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`Page 1 of 11
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`CATERPILLAR EXHIBIT 1154
`CATERPILLAR v. WIRTGEN
`IPR2017-02188
`
`

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`Application Publication
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`Dec. 25, 2008
`US 2008/0315666
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`Dec. 25, 2008 Sheet 2 of 5
`Patent Application Publication
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`Patent Application Publication
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`Dec. 25, 2008 Sheet 4 of 5 US 2008/0315666 Al
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`Page 5 of 11
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`US 2008/0315666 Al
`Dec. 25, 2008 Sheet 5 of 5
`Patent Application Publication
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`Fig. 5
`21
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`17
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`17A
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`17C'
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`21A
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`22
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`Page 6 of 11
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`US 2008/0315666 Al
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`Dec. 25, 2008
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`1
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`[0009] This object is achieved in accordance with the
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`SELF-PROPELLED MACHINE FOR CUTTING
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`invention by virtue of the features of claim 1. Advantageous
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`OR MILLING, IN PARTICULAR A MACHINE
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`embodiments of the invention form the subject matter of the
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`FOR WORKING DEPOSITS BY SURFACE
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`dependent claims.
`MINING
`[0010] The self-propelled machine for cutting or milling
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`according to the invention is characterised in that the driver's
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`station is not fixed on the chassis of the machine. Even though
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`[0001] The invention relates to a self-propelled machine for
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`the known machines for cutting or milling have a driver's
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`cutting or milling, and in particular to a machine for working
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`station which is arranged on the chassis of the machine, the
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`deposits, such as deposits of coal, ore, minerals, etc., by
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`inventors have found that if the driver's station is fixed on the
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`surface mining.
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`chassis this leads to shaking movements or vibrations being
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`[0002] There are various kinds of self-propelled machines
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`transmitted to the driver's station when the machine is oper­
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`for cutting or milling which are known. These machines
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`ating. The inventors have found that, to reduce the shaking
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`include, in particular, machines for working deposits by sur­
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`movements or vibrations which are transmitted to the driver's
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`face mining and civil engineering machines for road-build­
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`station, it is an advantage if the driver's station is arranged to
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`ing, such for example as road-milling machines, which can be
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`have as direct as possible a link, or in other words as direct as
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`used to remove existing layers of the surfacing structure of
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`possible a connection, to the ground.
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`roads, and recyclers, which can be used to recondition exist­
`[0011] In the self-propelled machine according to the
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`ing road surfacings.
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`invention for cutting or milling, the driver's station is fixed on
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`[0003] The machines for working deposits by surface min­
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`the arrangement for adjusting the height of the chassis. It is
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`ing, which are also referred to as surface miners, have an
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`assumed in this case that the height-adjusting arrangements
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`arrangement for cutting rock which has a mechanically or
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`of the known self-propelled machines for cutting or milling
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`hydraulically driven cutting drum. Road-milling machines or
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`have components which are associated with the track-laying
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`recyclers have a milling arrangement which has a milling
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`units or wheels and which are connected to the chassis in such
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`drum. The cutting or milling drums are fitted with tool holders
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`a way that the said components are able to move when the
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`to receive the cutting or milling tools.
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`chassis is raised or lowered, and that they have components
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`[0004] While the cutting or milling arrangement is operat­
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`which are not able to move during the adjustment of height.
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`ing, shaking movements and vibrations occur in the machines
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`[0012] In the self-propelled machine according to the
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`for cutting or milling. Particularly when a machine for work­
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`invention, the driver's station is fixed on a component of the
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`ing deposits by surface mining is operating, the shaking
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`height-adjusting arrangement which is connected to the chas­
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`movements and vibrations, which occur particularly when
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`sis in such a way as to be able to move. This does not mean that
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`very hard granite or hard limestone is being quarried, are very
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`the driver's station is rigidly connected to the chassis and
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`severe. The person driving the machine is directly exposed to
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`therefore shares in the movements of the chassis but that the
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`these very severe shaking movements and vibrations.
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`driver's station is mounted on a component of the height­
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`[0005] Known surface miners have an enclosed and sealed­
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`adjusting arrangement which is connected to the chassis in
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`off driver's cab which is soundproofed and which has a rotat­
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`such a way as to be able to move. What is meant is this case by
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`able driver's seat. In the known surface miners, the driver's
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`the driver's station being fixed on a component which is
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`cab is fixed on the chassis, on which the cutting arrangement
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`connected to the chassis in such a way as to be able to move
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`is also arranged. In the case of road-milling machines and
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`is not only its being fixed on this one component but also that
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`recyclers too, the driver's station is fixed on the chassis.
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`the driver's station may be fixed on a plurality of components
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`[0006] A surface miner having a driver's cab which is fixed
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`which are connected to the chassis in such a way as to be able
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`on the chassis is known for example from EP 0 744 495 A2 or
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`to move. Nor, when the driver's station is said to be fixed on
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`DE 40 17 107 Al. In the surface miner known from EP 0 744
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`the movable component of the height-adjusting arrangement,
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`495 A2, the driver's cab is arranged at that end of the chassis
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`does this mean that a component of the driver's station has to
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`of the machine which is at the front in the direction of travel,
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`be connected directly to the component of the height-adjust­
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`whereas in the surface miner known from DE 40 17 107 Al
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`ing arrangement. Instead, to fix the driver's station in place, a
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`the driver's station is situated in the centre of the chassis of the
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`component of the driver's station may also be connected to
`machine.
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`the movable component of the height-adjusting arrangement
`[0007] DE 10 2005 044 211 Al describes a self-propelled
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`via some other component, such for example as a strut or the
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`civil engineering machine, and particular a recycler or cold­
`like.
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`milling machine, which has a chassis which is carried by
`[0013] The basic principle of the machine according to the
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`running gear which allows the height of the chassis to be
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`invention for cutting or milling lies in the fact of decoupling
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`adjusted. A driver's station for a person driving the vehicle is
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`the driver's station from the shaking movements or vibrations
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`arranged on the chassis of the machine above the front wheels
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`of the arrangement for cutting or milling which are transmit­
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`of the running gear. The front and rear wheels of the running
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`ted to the driver's station or from the vibrations which are
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`gear are fixed to the chassis of the machine by means of
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`produced by the internal combustion engine for driving the
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`height-adjusting arrangements, thus enabling the height of
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`machine. This decoupling is advantageously accomplished
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`the chassis of the machine to be adjusted relative to the
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`by having the height-adjusting arrangement form a system
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`ground. If the height of the chassis of the machine is adjusted,
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`which connects the track-laying units or wheels to the chassis
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`there is also a change in the height of the driver's station above
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`not rigidly but in such a way that they are able to move. The
`the ground.
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`movable suspension causes the driver's station and the chassis
`[0008] The object underlying the invention is to provide a
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`to be decoupled from one another. What is achieved in this
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`self-propelled machine for cutting or milling whose comfort
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`way is that the driver's station, like the running gear of the
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`and convenience when being driven is improved.
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`machine, stands, as it were, "solidly on the ground", whereas
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`Page 7 of 11
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`US 2008/0315666 Al
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`Dec. 25, 2008
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`2
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`the sub-assemblies of the machine which have the cutting or
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`side of the machine, which is the opposite side from the drive
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`milling arrangement and the internal combustion engine are
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`side, the end-face of the cutting or milling drum then extends
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`carried by the running gear in such a way as to be adjustable
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`to a point close to the outside of the chassis, whereas on the
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`in height relative to the ground.
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`drive side the end face of the cutting or milling drum is set
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`back from the outer boundary of the chassis of the machine
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`[0014] The means for adjusting the components of the
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`for a relatively long distance. Hence, to achieve a steep angle
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`height-adjusting arrangement which are connected to the
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`of inclination, the non-drive side of the machine is used to
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`chassis in such a way as to be able to move advantageously
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`mill along the inclination. The fact that the driver's station is
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`cause the system to be damped. In a preferred embodiment,
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`arranged on the drive side is then of advantage in that the
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`the means for adjusting the movable components of the
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`person driving the machine cannot be endangered by stones
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`height-adjusting arrangement are means able to be actuated
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`coming from the inclination. If however there is no risk of
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`hydraulically and/or pneumatically which preferably have a
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`being hit by stones, it may also be advantageous for the
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`piston-and-cylinder arrangement.
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`driver's station to be arranged on the non-drive side, because
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`[0015] Because of the elasticity of the flexible lines for
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`the person driving the machine then has a better view of the
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`actuating the piston-and-cylinder arrangement and/or the
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`region which is being milled. Provision may therefore be
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`compressibility of the pressurised medium for actuating it,
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`made, in a preferred embodiment of the machine, to enable
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`the piston-and-cylinder arrangement able to be actuated
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`the driver's station to be arranged on either the drive side or
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`hydraulically and/or pneumatically acts as an element which
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`the non-drive side of the machine without the need for any
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`damps the shaking movements or vibrations. It has been
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`extensive conversion work.
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`found that, by fixing the driver's station on the height-adjust­
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`ing arrangement, the oscillations and vibrations which occur
`[0024] In a particularly preferred embodiment of the inven­
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`when the cutting or milling arrangement is operating, whose
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`tion, provision is made for the height-adjusting arrangement
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`amplitude and frequency are absolutely indeterminate, can be
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`to have parallelogram mountings associated with the indi­
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`effectively damped.
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`vidual track-laying units or wheels. The parallelogram
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`mountings preferably each have an upper and a lower com­
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`[0016] The fixing of the driver's station on the height-ad­
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`ponent which are each hingeably connected to the chassis at
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`justing arrangement also gives the advantage that the height
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`one end, and a component which is hingeably connected to
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`of the driver's station relative to the ground remains
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`the other ends of the upper and lower components and from
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`unchanged when the height of the chassis relative to the
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`which the track-laying unit or wheel is suspended. In this
`ground is changed.
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`particularly preferred embodiment, the driver's station is
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`[0017] A further preferred embodiment of the invention
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`fixed on the component which is hingeably connected to the
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`makes provision for the driver's station to be rotatable on a
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`upper and lower components of the parallelogram mounting.
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`vertical axis. The driver's station may preferably be rotated
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`This component maintains its position relative to the ground
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`of the track-laying independently of the rotary movement
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`when the chassis is raised or lowered. The position of the
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`units or wheels when the machine is being steered.
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`driver's station therefore remains unchanged too when the
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`[0018] The driver's station is preferably arranged above the
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`chassis is raised or lowered.
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`track-laying unit or wheel and substantially above the point at
`[0025] The component which hingeably connects the upper
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`which the track-laying unit is suspended to rock or the wheel
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`and lower components of the parallelogram mounting may
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`is fixed to be able to turn. The person driving the machine then
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`take different forms. Preferably, the said component takes the
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`stands or sits exactly above the track-laying unit or wheel by
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`form of a cylindrical component, such as a pillar for example.
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`which the track-laying unit or wheel stands solidly on the
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`ground. This arrangement has proved to be optimum with
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`[0026] The driver's station is preferably carried by a fixing
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`regard to reducing the shaking movements or vibrations.
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`arrangement which encloses the cylindrical component in
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`[0019] The driver's station which is rotatable on a vertical
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`such a way as to be rotatable on a vertical axis. The driver's
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`axis may however also be arranged next to the axis of rotation.
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`station is preferably arranged above the cylindrical compo­
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`The distance from the axis of rotation may preferably be of a
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`nent so that the person driving the machine can see the track­
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`size such that the driver's station can pivot out to the outer
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`laying units or wheels to allow him to check the steering
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`that the boundary of the chassis. This has the advantage
`movements.
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`person driving the machine can obtain a better view of the
`[0027] The fact of the driver's station being fixed on the
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`region that is being milled if the driver's station is rotated.
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`height-adjusting arrangement also proves to be advantageous
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`[0020] The driver's station preferably has a rotatable driv­
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`in that the driver's station can be arranged at a relatively low
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`er's seat, thus enabling the driver to change the direction in
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`point but when so arranged always remains above the height­
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`which he is looking by rotating the driver's seat, regardless of
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`adjusting arrangement. This gives a better view to the side,
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`any movement of the driver's station in rotation.
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`thus enabling the person driving the vehicle to watch the
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`[0021] Because the driver's station maintains its height
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`unloading of the material which has been cut or milled away.
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`above the ground, the driver's station can be climbed into
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`[0028] An arrangement for adjusting the height of the chas­
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`from a ladder of the same length in any of the working
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`sis which takes the form of a parallelogram mounting is of
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`positions. The ladder for climbing into the driver's station is
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`particular advantage when the-machine according to the
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`preferably a ladder which can be unfolded.
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`invention for cutting or milling is a machine for working
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`[0022] The driver's station is preferably in the form of a
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`deposits by surface mining ( a surface miner). When however
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`driver's cab which protects the driver from falling fragments,
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`the machine according to the invention is a road-milling
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`dust and dirt and also noise.
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`machine or recycler, the arrangement for adjusting the height
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`[0023] In a further preferred embodiment, the driver's sta­
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`of the chassis advantageously takes the form of a straight-line
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`tion is arranged on what is termed the drive side of the
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`mounting having two components able to be displaced rela­
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`machine, on which the drive unit for the cutting or milling
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`tive to one another of which one component is connected to
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`arrangement is also arranged. On what is called the non-drive
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`the chassis and from the other of which components the
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`Page 8 of 11
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`US 2008/0315666 Al
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`Dec. 25, 2008
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`3
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`track-laying unit or wheel is suspended. The driver's station is
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`those parallelogram mountings which are arranged at the
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`connected in this embodiment to that component of the
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`front end of the chassis are identified by reference numeral 8.
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`straight-line mounting from which the running gear is sus­
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`The four track-laying units 6A, 6B are suspended on the
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`pended. In this embodiment, the components which are dis­
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`parallelogram mountings 7, 8 to rock thereon, the track-lay­
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`placeable relative to one another preferably have an outer
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`ing units being able to be moved in relation to the chassis in a
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`hollow cylinder which is connected to the chassis and in
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`vertical plane. However, because the track-laying units stand
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`which an inner hollow cylinder is guided to be longitudinally
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`on the ground, it is the chassis 1 which is raised or lowered
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`displaceable. To allow the chassis to be raised or lowered, a
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`relative to the ground.
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`piston-and-cylinder arrangement, which can be actuated
`[0039] The individual components of that parallelogram
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`hydraulically or pneumatically, is preferably arranged in the
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`mounting 8 which is arranged at the front end of the chassis
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`inner hollow cylinder. The piston-and-cylinder arrangement
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`and which is associated with that track-laying unit 6A which
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`once again constitutes a damping element to allow shaking
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`is on the left in the direction of travel are shown enlarged in
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`movements or vibrations to be kept away from the driver's
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`FIG. 2. The front left-hand parallelogram mounting 8 for
`station.
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`suspending the front left-hand track-laying unit 6A in such a
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`[0029] Embodiments of the invention will be explained in
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`way as to rock has a top link SA and a bottom link SB which
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`detail below by reference to the drawings. In the drawings:
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`are each hingeably connected to the chassis 1 at one end, thus
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`[0030] FIG. 1 is a view from the side of a machine for
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`enabling the top and bottom links SA, SB to pivot on respec­
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`working deposits by surface mining,
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`tive horizontal axes 9, 10. The other ends of the two links SA,
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`SB are connected to the top and bottom ends of a vertical pillar
`[0031] FIG. 2 is an enlarged view from the side of detail A
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`SC. This being the case, the two links SA, SB and the pillar
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`of FIG. 1, showing the driver's station of the machine shown
`SC
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`form a parallelogram, with the pillar SC being able to be
`in FIG.1,
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`moved up and down in a vertical plane.
`[0032] FIG. 3 is a plan view of the machine of FIG. 1,
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`[0040] To allow the pillar SC to be raised or lowered, the
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`B ofFIG. 3, [0033] FIG. 4 is an enlarged plan view of detail
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`parallelogram mounting 8 has a piston-and-cylinder arrange­
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`showing the driver's station and
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`ment SD, with one end of the piston SD' of the piston-and­
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`[0034] FIG. 5 is a simplified schematic view of a further
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`cylinder arrangement SD being hingeably connected to the
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`embodiment of the arrangement of the driver's station on a
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`bottom end of the pillar SC and one end of the cylinder SD"
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`civil engineering machine.
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`thereof being hingeably connected to the chassis 1. By
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`[0035] FIGS. 1 and 3 are views from the side and in plan of
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`retracting and extending the piston of the piston-and-cylinder
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`a machine for working deposits by surface mining which will
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`arrangement, the pillar SC of the parallelogram mounting 8 is
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`be referred to in what follows as a surface miner. The surface
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`respectively raised and lowered if the running gear is not
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`miner for cutting rock has a chassis 1 which takes the form of
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`standing on the ground. However, because the running gear is
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`a welded structure which is stiff in bending. Arranged on the
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`standing on the ground, it is the chassis which is raised or
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`chassis 1 is a cutting arrangement 2 having a cutting drum 3
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`lowered if the piston-and-cylinder arrangement SD is actu­
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`which is provided with tool holders (not shown) to receive the
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`ated, thus changing the depth of cut.
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`cutting tools (not shown). The drive unit (not shown) having
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`[0041] The surface miner has a driver's station 10 which is
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`the internal combustion engine for driving the machine is
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`in the form of an enclosed, soundproofed driver's cab. Situ­
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`situated in the chassis 1. The mechanical transmission for
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`ated in the driver's cab 10 is a rotatable driver's seat lOA for
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`transmitting force from the internal combustion engine to the
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`the person driving the machine. The driver's cab 10 is glazed
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`cutting or milling drum is situated on what is termed the drive
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`all round, thus given the person driving the machine a view in
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`side of the machine which, in the present embodiment, is that
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`all directions. It has left-hand and right-hand driver's doors
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`side of the machine which is on the left in the direction of
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`1 OB, 1 OC. The person driving the machine is able to reach the
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`travel. On what is termed the non-drive side of the machine,
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`driver's cab 10 by means of a ladder 11 whose length can be
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`which is the opposite side from the drive side, the end-face of
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`adjusted. The ladder 11 comprises bottom and top portions
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`the cutting or milling drum then extends to a point close to the
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`llA, llB which are hingeably connected to one another. The
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`outer side of the chassis, whereas on the drive side the end­
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`ladder can be folded upwards with a piston-and-cylinder
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`face of the cutting or milling drum is set a relatively long
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`arrangement llC.
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`of the distance back from the outer chassis boundary of the
`machine.
`[0042] The driver's cab 10 is so arranged that its centre of
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`[0036] The material which is cut and comminuted by the
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`gravity is situated above the track-laying unit or wheel and
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`cutting drum 3 is picked up by a loading means 4 which
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`substantially above the pillar SC of the parallelogram mount­
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`comprises a wide pick-up belt downstream of the cutting
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`ing 8, the driver's seat lOA too being situated above the pillar.
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`drum 3 in the direction of travel and a succeeding discharge
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`It is accessible to the person driving the machine from both
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`belt 6 for unloading onto transport vehicles. The height of the
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`sides by means of a walkway 13 which extends round it.
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`discharge belt 6 can be adjusted and it can be pivoted to both
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`[0043] In what follows, the way affixing the drivers' cab 10
`sides.
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`on the arrangement for adjusting the height of the chassis,
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`[0037] The chassis 1 can be moved on two front and two
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`which is what distinguishes the surface miner according to the
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`rear track-laying units 6A and 6B which are arranged at the
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`invention, will be described in detail.
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`front and rear ends of the chassis 1, and the depth of cut is
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`[0044] The parallelogram mounting 8 has components
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`adjusted by raising or lowering the said chassis.
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`which are movable relative to the chassis 1 and these include
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`[0038] The arrangement for adjusting the height of the
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`the top and bottom links SA and SB and the pillar SC and,
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`chassis 1 has parallelogram mountings which are associated
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`basically, the piston-and-cylinder arrangement SD too. The
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`with the individual track-laying units 6A, 6B and of which
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`driver's cab 10 is fixed, on one of the components of the
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`those parallelogram mountings which are arranged at the rear
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`parallelogram mounting 8 which are hingeably connected to
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`end of the chassis are identified by reference numeral 7 and
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`the chassis 1, to be rotatable on a vertical axis.
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`Page 9 of 11
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`

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`US 2008/0315666 Al
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`Dec. 25, 2008
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`4
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`[0045] In the present embodiment, the chassis is fixed on
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`arrangement having a cutting drum, what is provided is a
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`the pillar SC of the parallelogram mounting 8 to be rotatable
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`milling arrangement (not shown) having a milling drum.
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`on a vertical axis. Because the running-gear unit 6A stands on
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`However, the milling arrangement having the milling drum
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`the ground, the position of the driver's cab relative to the
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`also produces shaking movements or vibrations when oper­
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`ground remains unchanged if the piston-and-cylinder
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`ating, to which the person driving the machine ought not to be
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`arrangement SD of the parallelogram mounting 8 is actuated.
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`exposed. Added to these there are also, once again, the vibra­
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`tions from the internal combustion engine used to drive the
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`[0046] Fixing the driver's cab 10 on the pillar SC of the
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`machine. The suspension of the running gear of the road­
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`parallelogram mounting 8 has the crucial advantage that the
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`milling machine or recycler differs from the running-gear
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`driver's cab is decoupled from the chassis 1. Because ofthis
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`suspension of the surface miner in that a straight-line mount­
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`decoupling, shaking movements or vibrations which occur
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`ing is provided rather than a parallelogram mounting.
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`when the cutting drum 3 and the internal combustion engine
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`are running to operate the machine are not transmitted
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`[0052] The straight-line mounting 17 of the road-milling
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`directly to the driver's cab. In this case, the piston-and-cylin­
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`machine has an outer hollow cylinder 17 A which is fixed on
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`der arrangement SD of the parallelogram mounting 8 consti­
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`the chassis 18 of the road-milling machine. FIG. 5 shows only
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`tutes a damping element which reduces the shaking move­
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`one of the total of four straight-line mountings 17 which the
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`ments or vibrations. Basically, it is equally possible for the
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`road-milling machine has. The straight-line mounting in
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`driver's cab to be fixed on some other movable component of
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`question is the straight-line mounting on the drive side of the
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`the parallelogram mounting such for example as on the top or
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`machine, which is on the left in the direction of travel.
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`bottom link SA, SB. However, fixing it in this way has proved
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`[0053] Arranged to be longitudinally displaceable in the
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`to be more costly and complicated structurally because these
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`outer hollow cylinder 17 A of the straight-line mounting 17 is
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`components change their position relative to the ground when
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`an inner hollow cylinder 17B whose bottom end is connected
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`the piston-and-cylinder arrangement SD is actuated.
`to a strut 19 to which a wheel 20 which is able to turn on a
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`[0047] The driver's cab 10 is carried by a fixing arrange­
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`horizontal axis 20' is fixed or from which a track-laying unit
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`ment 12 which has a vertical pillar 12A fixed to a base-plate
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`able to pivot on the axis 20' may equally well be suspended.
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`l0D of the driver's cab and a bracket 12B which is connected
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`Situated inside the inner hollow cylinder 17B is a piston-and­
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`to a plain bearing 23 which is mounted on the pillar SC of the
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`cylinder arrangement 17C whose piston 17C' is fixed to the
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`parallelogram mounting 8. The driver's seat l0A in the driv­
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`chassis 18 and whose cylinder 17C" is connected to the strut
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`er's cab 10 is mounted above the parallelogram mounting 8,
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`19.By actuating the piston-and-cylinder arrangement 17C,
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`on the axis of the pillar SC, in this case. Because the person
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`the outer and inner cylinders 17 A, 17B are displaced relative
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`driving the machine is not situated in front of the pillar SC in
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`to one another and the height of the chassis 18 is thus adjusted
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`the direction of travel but directly above it, he is able to see the
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`relative to the ground.
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`front track-laying units 6A to allow him to check the steering
`[0054] The civil engineering machine whose running-gear
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`movements.
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`suspension is shown in FIG. 5 is described in detail in DE 10
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`[0048] To allow the cab to be turned about the pillar SC of
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`2005 044 211 Al, the disclosure of which is hereby incorpo­
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`the parallelogram mounting 8, a piston-and-cylinder arrange­
`rated by reference.
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`ment 14 is provided whose piston 14A is hingeably connected
`[0055] In the civil engineering machine shown in FIG. 5,
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`to the bracket 12B of the arrangement 12 for fixing the driv­
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`which has a straight-line mounting 17 rather than a parallelo­
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`er's cab 10 and whose cylinder 14B is hingeably connected to
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`gram mounting for the individual wheels, the driver's station
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`the chassis 1. When the piston 14A of the piston-and-cylinder
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`21, which is only shown schematically and which is in the
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`arrangement 14 is retracted or extended, the driver's cab 10
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`form of an enclosed driver's cab having a driver's seat able to
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`turns on a vertical axis regardless of the position of the track­
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`be rotated on the axis 21A', is once again fixed on a compo­
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`laying unit 6A.
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`nent of the mounting which is movable relative to the chassis,
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`[0049] To steer the surface miner, the front track-laying
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`this component being, in the present case, the inner hollow
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`units 6A are turned on a vertical axis. Each track-laying unit
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`cylinder 17B of the piston-and-cylinder arrangement 17. In
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`is provided for this purpose with a further piston-and-cylinder
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`this case the fixing is not directly on the inner hollow cylinde