Case 1:17-cv-00770-JDW Document 369-38 Filed 04/12/24 Page 1 of 22 PageID #: 34347
`Case 1:17-cv-00770-JDW Document 369-38 Filed 04/12/24 Page 1 of 22 PagelD #: 34347
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`EXHIBIT 38
`EXHIBIT 38
`
`

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`Case 1:17-cv-00770-JDW Document 369-38 Filed 04/12/24 Page 2 of 22 PageID #: 34348
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`01111117UNIITIP11111111111111111111M1111111011111111M111111111511611111LIIIIIIIIIIIIIIMIL
`
`164411
`
`iuLITJTr
`
`=77zb
`Iiirr7777 ill
`
`F
`
`17WEktif
`
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`
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`
`4
`
`111q
`
`kilicTrET111 17711
`1111VAIONVERE SE 1 PrItEMgtHhEOM
`
`Ano
`
`UNITED STATES DEPARTMENT OF COMMERCE
`United States Patent and Trademark Office
`
`THIS IS TO CERTIFY THAT ANNEXED HERETO IS A TRUE COPY FROM
`THE RECORDS OF THIS OFFICE OF
`
`PATENT NUMBER 7828309
`ISSUE DATE November 9 2010
`
`By Authority of the
`Under Secretary of Commerce for Intellectual Property
`and Director of the United States Patent and Trademark Office
`
`Miguel Tarver
`Certifying Officer
`
`TRIAL EXHIBIT
`
`Ex 0001
`
`PITIIIMIltIkettEZEIM
`
`Ex
`
`00010001
`
`

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`Case 1:17-cv-00770-JDW Document 369-38 Filed 04/12/24 Page 3 of 22 PageID #: 34349
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`111111111111111111111111111j1111110111111111111111111111111111111
`
`12 United States Patent
`Berning et al
`
`10 Patent No
`45 Date of Patent
`
`US 7828309 B2
`Nov 9 2010
`
`54 ROAD BUILDING MACHINE
`75 Inventors Christian Berning Zillpich DE
`Dieter Simons Buchholz DE Markus
`Schafer Niederkassel DE
`73 Assignee Wirtgen GmbH DE
`
`Notice
`
`Subject
`
`to any disclaimer the term of this
`is extended or adjusted under 35
`USC 154b by 390 days
`
`patent
`
`21
`
`22
`
`86
`
`Appl No
`
`11885460
`
`PCT Filed
`
`Mar 9 2006
`
`PCT No
`
`PCTEP2006002151
`
`§ 371 c12 4 Date
`
`Nov 13 2007
`87 PCT Pub No W02006094795
`
`PCT Pub Date Sep 14 2006
`
`65
`
`Prior Publication Data
`
`US 20080203684 Al
`
`Aug 28 2008
`
`10 2005 011 052
`
`30
`Foreign Application Priority Data
`Mar 10 2005 DE
`51 Int Cl
`B60G 904
`200601
`52 US Cl
`2806154
`280124159
`58 Field of Classification Search
`2805506
`2805507 5508 6155 124106 124157
`280124158
`124159 12416 124161
`2806154
`See application file for complete search history
`
`56
`
`References Cited
`US PATENT DOCUMENTS
`
`3895820 A
`4247126 A
`5269556 A
`B1
`6669216
`7055832 B2
`
`Takahashi et al
`
`71975
`11981
`Claxton etal
`121993 Heyring et al
`122003 Elser etal
`62006 Germain
`
`2806158
`
`280124106
`2805508
`
`FOREIGN PATENT DOCUMENTS
`
`AT
`DE
`DE
`EP
`FR
`JP
`
`WO
`
`272 115
`
`19 63 704
`
`28 44 413
`0940274
`2 161 017 A
`2005053 377
`WO 9742377 A
`
`61969
`71967
`41980
`91999
`71973
`32005
`111997
`
`cited by examiner
`
`Paul N Dickson
`PrimaryExaminer
`Robert A Coker
`Assistant Examiner
`74 Attorney Agent or Firm Waddey
`Lucian Wayne Beavers
`
`57
`
`ABSTRACT
`
`Patterson PC
`
`pillar
`
`The invention relates to a road building machine whose left
`front wheel 4 or caterpillar
`right front wheel 6 or cater
`left rear wheel 8 or caterpillar and right rear wheel
`10 or caterpillar are connected to the road building machine
`chassis by means of an actuating
`element and are height
`to the road building machine frame
`adjustable with respect
`According to said invention different actuating elements are
`rigidly connected to the road building machine chassis and
`forcedly coupled to each other in such a way that the left front
`wheel 4 or caterpillar and the right rear wheel 10 or cat
`to the right front wheel 6 or caterpillar and the left
`rear wheel 8 or caterpillar are adjustable
`directions The all wheels 4 6 8 10 or caterpillars are
`road building
`The
`equally height adjustable
`machine provides a high operational
`stability the improved
`compensation of the adjustment of lateral hindrance inclina
`tion of the road building machine and the irregularities in the
`longitudinal direction thereof
`
`erpillar are height adjustable in the same direction and with
`
`respect
`
`in the opposite
`
`inventive
`
`2926023 A
`
`21960 Kraus
`
`280124106
`
`37 Claims 9 Drawing Sheets
`
`2
`
`Ex
`
`00010002
`
`

`

`Case 1:17-cv-00770-JDW Document 369-38 Filed 04/12/24 Page 4 of 22 PageID #: 34350
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`US Patent
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`Nov 92010
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`Sheet 1 of 9
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`US 7828309 B2
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`c1
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`vs
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`Nb
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`1 C
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`J
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`Ex
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`00010003
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`

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`Case 1:17-cv-00770-JDW Document 369-38 Filed 04/12/24 Page 5 of 22 PageID #: 34351
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`US Patent
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`Nov 92010
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`Sheet 2 of 9
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`US 7828309 B2
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`C41
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`I
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`Ex
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`00010004
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`

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`Case 1:17-cv-00770-JDW Document 369-38 Filed 04/12/24 Page 6 of 22 PageID #: 34352
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`US Patent
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`Nov 92010
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`Sheet 3 of 9
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`US 7828309 B2
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`N
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`Ex
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`00010005
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`Cmo
`IV
`1
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`1
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`Case 1:17-cv-00770-JDW Document 369-38 Filed 04/12/24 Page 7 of 22 PageID #: 34353
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`US Patent
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`Nov 92010
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`Sheet 4 of 9
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`US 7828309 B2
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`i
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`19
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`1
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`4
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`14
`
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`Ex
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`00010006
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`

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`Case 1:17-cv-00770-JDW Document 369-38 Filed 04/12/24 Page 8 of 22 PageID #: 34354
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`US Patent
`
`Nov 92010
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`Sheet 5 of 9
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`US 7828309 B2
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`4Pc=1
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`4N4
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`1
`
`f`r
`
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`
`90
`
`53 1
`
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`
`11N
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`Ex
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`

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`Case 1:17-cv-00770-JDW Document 369-38 Filed 04/12/24 Page 9 of 22 PageID #: 34355
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`US Patent
`
`Nov 92010
`
`Sheet 6 of 9
`
`US 7828309 B2
`
`Xkb Go
`
`Track
`
`Wheel base
`
`Milling width
`
`1700 mm
`6200 mm
`2000 mm
`Imo
`
`0
`
`Area ratio cylinder front rear
`
`1
`
`Threefold floating axle
`
`front
`
`front
`
`left
`
`0
`
`50
`50
`
`right
`
`200
`
`150
`50
`
`rear
`
`right
`
`0
`
`50
`50
`
`rear
`
`left
`
`0
`50
`50
`
`Unevenness
`Overall height
`
`Cylinder
`
`front
`
`center
`
`rear
`center
`
`left
`
`right
`
`center
`
`center
`
`machine
`center
`
`roller
`
`left
`
`roller
`
`right
`
`100
`
`0
`
`0
`
`100
`
`50
`
`9
`
`109
`
`Transverse tik
`
`Longitudinal 911
`
`588
`181
`
`front
`
`left
`
`rear
`
`Ex
`
`00010008
`
`

`

`Case 1:17-cv-00770-JDW Document 369-38 Filed 04/12/24 Page 10 of 22 PageID #: 34356
`
`US Patent
`
`Nov 92010
`
`Sheet 7 of 9
`
`US 7828309 B2
`
`Track
`
`Wheel base
`
`Milling width
`
`1700 mm
`6200 mm
`2000 mm
`
`X
`
`Floating axle rear
`
`110
`
`1
`
`1
`
`front
`
`left
`
`0
`
`0
`0
`
`front
`
`right
`
`200
`200
`0
`
`1
`
`rear
`
`right
`
`0
`
`100
`100
`
`rear
`
`left
`
`0
`100
`100
`
`Unevenness
`
`Overall height
`
`Cylinder
`
`front
`
`center
`
`rear
`center
`
`left
`
`center
`
`right
`
`center
`
`machine
`center
`
`roller
`
`roller
`
`left
`
`right
`
`100
`
`0
`
`50
`
`r
`
`150
`
`50
`
`88
`
`188
`
`TransverseN
`
`Lontudinalriol
`
`1178
`181
`
`front
`
`rear
`
`Ex
`
`00010009
`
`

`

`Case 1:17-cv-00770-JDW Document 369-38 Filed 04/12/24 Page 11 of 22 PageID #: 34357
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`US Patent
`
`Nov 92010
`
`Sheet 8 of 9
`
`US 7828309 B2
`
`6c
`
`Track
`
`Wheel base
`
`Milling width
`
`1700 mm
`6200 Mr0
`2000 min
`
`front
`
`left
`
`0
`
`100
`100
`
`front
`
`right
`
`200
`100
`100
`
`Unevenness
`
`Overall height
`
`Cylinder
`
`Transverse PM
`
`Longitudinal 1
`
`000
`161
`
`Floating axle front
`I
`
`r
`
`rear
`
`right
`
`rear
`
`left
`
`front
`
`rear
`
`center
`
`center
`
`left
`
`center
`
`right
`center
`
`machine
`center
`
`roller
`
`roller
`
`left
`
`right
`
`0
`0
`
`0
`
`0
`0
`
`0
`
`100
`
`0
`
`50
`
`50
`
`50
`
`50
`
`50
`
`Ex
`
`00010010
`
`

`

`Case 1:17-cv-00770-JDW Document 369-38 Filed 04/12/24 Page 12 of 22 PageID #: 34358
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`US Patent
`
`Nov 92010
`
`Sheet 9 of 9
`
`US 7828309 B2
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`i
`
`cx c
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`R
`
`AO
`
`Ex 0001 001
`
`1
`
`itir
`
`

`

`Case 1:17-cv-00770-JDW Document 369-38 Filed 04/12/24 Page 13 of 22 PageID #: 34359
`
`US 7828309 B2
`
`1
`ROAD BUILDING MACHINE
`
`RELATED APPLICATIONS
`
`This application is the US National Stage of International
`Application No PCTEP2006002151
`filed Mar 9 2006
`published in German and claims priority under 35 USC
`§119 or 365 to German Application No 10 2005 0110525
`filed Mar 10 2005
`relates to a road building machine
`The present
`invention
`in particular a road milling machine a recycler or a stabilizer
`ofwhich the left front wheel or caterpillar right front wheel or
`caterpillar left rear wheel or caterpillar and right rear wheel
`or caterpillar is adjustable in height by means of an actuating
`member
`When a road building machine of this type travels over an
`obstacle for example with only one front wheel this one front
`wheel
`is raised by the amount of the height of the obstacle
`remains on the road The road
`while the other front wheel
`building machine
`set obliquely with the
`is consequently
`result that the milling roller ofthe road milling machine or the
`millingmixing rotor of the recycler or of the stabilizer is also
`set obliquely This effect has an especially disruptive effect
`particularly when the track of the machine is relatively low in
`relation to the wheel base
`Various machines are known from the prior art which must
`react with a suitable way to unevenness in the ground on
`which these machines move so that
`the stability of the
`machines
`is not at risk
`US Pat No 4247126 describes an agricultural machine
`in which two front wheels and two rear wheels are provided
`Each individual wheel can be adjusted in height a working
`cylinder being provided on each wheel
`for this purpose The
`working cylinders are partially connected to one another by
`system being pro
`corresponding
`lines a hydraulic control
`vided which is designed such that either the front and the rear
`wheel on the left side or the front and the rear wheel on the
`right side of the agricultural machine can be raised or low
`ered Thus the machine when it moves transversely with
`to a slope can be straightened
`respect
`EP 0 836 659 B1 discloses a chassis of a road building
`machine said chassis having a frame carried on two front
`wheels and two rear wheels The front wheels of the known
`chassis are suspended such that they can follow changes in the
`transverse inclination of the road topping contradirectionally
`and to the same extent In order to couple the two front wheels
`in such a way that these move contradirectionally and to the
`same extent the guides of the two front wheels are connected
`to one another via a corresponding mechanical or hydraulic
`coupling device This arrangement which is often used in the
`prior art is also designated as a floating axle
`The road milling machine described in EP 0 940 274 A2
`likewise has two front wheels which are adjustable in height
`contradirectionally and by equal amounts On account of the
`positive coupling of the front wheels the known chassis can
`to elevations or depressions on one side of the road in
`react
`that one front wheel
`is lowered or raised while the other front
`a contradirectional movement
`wheel
`executes
`for
`If
`example there is an elevation of height a on one side the
`front wheel
`is raised in relation to the machine
`corresponding
`by a2 while the other front wheel
`is lowered in relation to the
`chassis by a2 Thus overall
`the machine is raised by only
`a2 thus improving the handiness ofthe machine and increas
`ing its driving comfort
`
`In the prior art described above there is the disadvantage
`is not possible to mount both the front wheels and the
`that
`
`it
`
`2
`
`5
`
`rear wheels floatingly with positive coupling in the way
`described since this would lead to an unstable position of the
`machine
`When the machine is traveling along and is moving along
`a straight path any obstacle in the form of an elevation or
`depression on one side of the machine is driven over not only
`by the floatingly mounted front axle but also by the nonfloat
`ingly mounted rear axle In the region of the nonfloatingly
`mounted wheels the obstacle then acts to its full extent on the
`0 vehicle frame This is detrimental
`to the stability of these
`machines Moreover where a road milling machine is con
`cerned the milling result is also impaired
`The object on which the present
`invention is based is
`therefore to improve the stability of the road building
`15 machines initially mentioned as compared with the prior art
`mentioned
`
`Furthermore the object on which the present
`invention is
`both of transverse
`based is to improve the compensation
`initially men
`inclinations of the road building machines
`occur wnen oosiacies
`are CII1V ell over alict
`11011CCI wind
`adversely influence the milling pattern of these road building
`machines and of unevenness in the longitudinal direction of
`these road building machines
`to the invention by
`This object
`is achieved
`according
`means of the features specified in patent claim 1 Advanta
`geous embodiments of the invention are the subject matter of
`the subclaims
`The road building machine according to the invention has
`rinht frsnt xx71waal nr Atar
`Lafi frnnt xx7111
`
`rsAtrwrsillAr
`
`20
`
`2 5
`
`30
`
`35
`
`a left rear wheel or caterpillar and a right rear wheel or
`pillar
`caterpillar When a front wheel
`is referred to hereinafter this
`is also understood to mean a caterpillar Each of said wheels
`is assigned in each case an actuating member with the aid of
`is connected to the chassis of the
`which the respective wheel
`road building machine and can be adjusted in height in rela
`tion to the frame or chassis of the road building machine The
`frame can thereby be adjusted in height and oriented in rela
`tion to the ground In this context a height adjustment of the
`40 wheels is simply referred to hereafter According to the inven
`tion the actuating members are connected rigidly to the chas
`sis of the road building machine and are positively coupled to
`one another The positive coupling is in this case designed
`such that
`front wheel and the right rear wheel are
`the left
`in the opposite direction to the right front
`45 adjusted in height
`wheel and the left rear wheel
`the left front wheel and the right
`rear wheel being adjusted in height in the same direction
`The road building machine according to the invention is to
`as meaning in particular
`be understood
`a road milling
`50 machine a recycler or a stabilizer Road building machines of
`this type are known to a person skilled in the art and therefore
`a general description of these road building machines
`in
`terms of their construction
`and functioning is dispensed with
`
`55
`
`If all
`
`hereafter
`the actuating members are designed identically for
`example if cylinders having identical cross sections are pro
`vided as actuating members the height
`adjustment
`takes
`place essentially by equal amounts on all
`the wheels This is
`to be understood
`the amounts may only
`as meaning
`that
`theoretically be exactly equal
`is to say on the precondi
`that
`for example the machine frame is infinitely rigid
`tion that
`is fully incom
`the contact area is totally inflexible and the oil
`pressible In practice however minor deviations
`cannot be
`avoided It
`is also possible however to design the actuating
`65 members differently for example to provide cylinders having
`different diameters with the result that the tilting behavior of
`the machine can be influenced correspondingly
`
`60
`
`Ex
`
`00010012
`
`

`

`Case 1:17-cv-00770-JDW Document 369-38 Filed 04/12/24 Page 14 of 22 PageID #: 34360
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`US 7828309 B2
`
`3
`
`The positive coupling
`according to the invention ensures
`that the road building machine according to the invention has
`in a road
`high stability this being particularly important
`building machine having a narrow track On account of the
`required transport dimensions the track is generally rela
`tively narrow The road building machine according to the
`invention puts into practice virtually a floating mount of both
`the front axle and the rear axle with the result that stability is
`decisively improved The building machine
`therefore
`is
`capable of driving safely over surfaces with a relatively high
`inclination without the risk of the machine overturning Fur
`thermore the permissible height of an obstacle which can be
`driven over by only one wheel of the machine is doubled as
`compared with the prior art In this case a permissible height
`of an obstacle is to be understood as meaning the height which
`can be compensated by the raising or lowering of all
`the
`the wheels
`wheels of the building machine just such that all
`stand on the road without
`in the case ofone ofthe wheels the
`point being reached at which the wheel has completely run
`is to say the machine is blocked
`out or run in that
`In the road building machine according to the invention
`the actuating members are designed as doubleacting work
`ing cylinders with a first and a second working chamber
`which are filled with a pressure medium the working cylin
`ders being connected to one another by coupling lines A
`pressure medium which may be considered is for example a
`hydraulic oil
`According to an advantageous embodiment of the road
`building machine according
`to the invention the working
`cylinders are arranged in such a way that the filling ofthe first
`working chamber or the emptying of the second working
`chamber causes
`a lowering of the wheel while the filling of
`the second working chamber or the emptying of the first
`causes a raising of the wheel
`working chamber
`in relation to
`the frame
`In a further preferred embodiment of the road building
`machine according to the invention a first working cylinder is
`provided for the height adjustment of the left
`front wheel a
`second working cylinder is provided for the height adjust
`ment of the right
`front wheel
`a third working cylinder is
`provided for the height adjustment of the left rear wheel and
`a fourth working cylinder is provided for the height adjust
`ment of the right rearwheel
`In order to afford particularly simple positive coupling
`according to the invention in a particularly preferred embodi
`ment of the road building machine according to the invention
`the first working chamber of the first working cylinder
`connected to the first working chamber ofthe second working
`cylinder the second working chamber of the second working
`cylinder is connected to the second working chamber of the
`the first working chamber of the
`fourth working cylinder
`is connected to the first working
`fourth working cylinder
`chamber of the third working cylinder and the second work
`ing chamber of the third working cylinder is connected to the
`second working chamber of the first working cylinder via
`coupling lines
`However since the positive coupling
`can also be imple
`mented by connecting
`the other working chambers in each
`embodiment of the road
`case in a further advantageous
`building machine according to the invention the second work
`ing chamber of the first working cylinder is connected to the
`second working chamber of the second working cylinder
`the
`first working chamber of the second working cylinder is con
`nected to the first working chamber of the fourth working
`the second working chamber of the fourth working
`cylinder
`cylinder is connected to the second working chamber of the
`third working cylinder and the first working chamber of the
`
`is
`
`5
`
`4
`third working cylinder is connected to the first working cham
`ber of the first working cylinder via coupling lines
`In a further advantageous embodiment ofthe road building
`machine according to the invention the first and the second
`working cylinder are connected to one another via a first
`coupling line the second and the fourth working cylinder are
`connected to one another via a second coupling line the
`fourth and the third working cylinder are connected to one
`line and the third and the first
`another via a third coupling
`10 working cylinder are connected to one another via a fourth
`coupling line
`
`15
`
`In a particularly preferred embodiment of the road build
`ing machine according to the invention the working cylinders
`form together with the coupling lines a closed system This
`the possibility of other hydraulic
`however does not rule out
`being connected in another operating mode of
`components
`the chassis
`
`20
`
`In a particularly preferred embodiment of the road build
`ing machine according to the invention therefore the cou
`pling lines can be connected to a pressure medium source
`andor a pressure medium sump via working lines with the aid
`of a valve control
`if appropriate with the positive coupling
`being briefly canceled As a result further settings on the front
`25 or rear wheels can be carried out independently of the positive
`according to the invention thus making it possible
`coupling
`to use the chassis on terrains of the most diverse possible
`form It
`is therefore possible for example to orient the road
`building machine according
`to the invention horizontally
`is standing on ground with a transverse incli
`30 even though it
`nation in order at the same time to level out this ground by
`machining
`A pressure medium source may be understood as meaning
`for example an oil pump in which case the pressure medium
`35 sump may be formed by discharged oil within a collecting
`container
`
`is
`
`In a further advantageous embodiment ofthe road building
`machine
`according
`to the invention the valve control
`designed such that all
`the wheels are raised in a first operating
`40 mode and are lowered in a second operating mode this taking
`place in each case by the same amount
`In a further particularly advantageous embodiment of the
`road building machine according to the invention the valve
`is designed such that each individual wheel can be
`control
`raised in a first operating mode of the valve control and can be
`lowered in a second operating mode of the valve control
`embodiment of
`In a modification of the abovementioned
`the road building machine according to the invention only
`one of the two front wheels is raised in a first operating mode
`and is lowered in a second operating mode This means that
`the capability for the individual setting ofthe wheels relates to
`only the two front wheels
`According to a further advantageous embodiment of the
`road building machine according to the invention the valve
`in a specific operating mode of
`control is designed such that
`the left and the right front wheel or the left
`the valve control
`and the right rear wheel or the left rear wheel and front wheel
`or the right rear wheel and front wheel are adjusted in height
`in the same direction and by the same amount
`In a particularly advantageous embodiment of the road
`building machine according to the invention the valve control
`can be operated in an operating mode restoring the positive
`the user can
`this ensures that
`coupling In this embodiment
`the positive coupling in order to carry out addi
`65 also cancel
`tional settings on the individual wheels before he changes to
`the positive coupling mode again
`
`45
`
`50
`
`55
`
`60
`
`Ex
`
`00010013
`
`

`

`Case 1:17-cv-00770-JDW Document 369-38 Filed 04/12/24 Page 15 of 22 PageID #: 34361
`
`US 7828309 B2
`
`5
`
`6
`
`The invention is explained in more detail below by means
`of exemplary embodiments with reference to the accompa
`nying figures in which
`FIG 1 shows a diagrammatic illustration of a first embodi
`ment of the road building machine according to the invention
`FIG 2 shows a diagrammatic illustration of a second
`embodiment of the road building machine according to the
`invention
`FIG 3 shows a diagrammatic illustration of a third embodi
`ment of the road building machine according to the invention
`FIG 4 shows
`a diagrammatic illustration of a fourth
`embodiment of the road building machine according to the
`
`invention
`FIG 5 shows a diagrammatic illustration of a fifth embodi
`ment of the road building machine according to the invention
`FIGS 6a 6b 6c show the driving behavior of the road
`building machine according to the invention
`in comparison
`with the prior art and
`FIG 7 shows a diagrammatic illustration ofthe road build
`to make clear
`ing machine according
`to the invention
`
`its
`
`stability
`FIG 1 shows a first embodiment of the road building
`machine according to the invention which in the form of the
`road milling machine mentioned initially has a milling roller
`W FIG 7 which is arranged between the front and the rear
`wheels of said machine By contrast
`the road building
`machine according to the invention in the form of the recy
`cler or stabilizer mentioned
`initially has a millingmixing
`rotor W FIG 7 which is arranged between the front and the
`rear wheels of the road building machine
`A milling roller ofthis type or a millingmixing rotor of this
`type is known as such to a person skilled in the art and
`an exact description of the milling roller or of the
`therefore
`millingmixing rotor is dispensed with this at this juncture
`The road building machine according to the invention has
`front wheel 4 a right front wheel 6 a left rear wheel 8
`a left
`and a right rear wheel 10 which are merely indicated in FIG
`1 The wheels 4 6 8 10 allow a movement of the chassis in
`the driving direction which is indicated in FIG 1 by the arrow
`12 Each wheel 4 6 8 10 is assigned an actuating member
`which allows the height adjustment of the respective wheel 4
`6 8 10 The illustration of the connection between the actu
`ating member and the individual wheel has been dispensed
`with for the sake of clarity Here for example a guide device
`may be provided which is connected to the actuating member
`and on the end of which the corresponding wheel 4 6 8 10 is
`suspended via a bracket
`In the embodiment illustrated the actuating members are
`the working cylinders
`designed as working cylinders all
`in terms of their construction and their dimen
`being identical
`sions in the exemplary embodiment Thus the left front wheel
`4 is assigned a first working cylinder 12 the right front wheel
`6 is assigned a second working cylinder 14 the left rear wheel
`8 is assigned a third working cylinder 16 and the right rear
`is assigned a fourth working cylinder 18 However an
`wheel
`arrangement of working cylinders of different piston diam
`eters is also possible The characteristic of the road building
`machine
`can be influenced
`by different cylinders being
`arranged on the front axle and the rear axle
`The working cylinders 12 14 16 18 are designed as
`doubleacting working cylinders so that the working cylin
`ders 12 14 16 18 have in each case a piston side first work
`ing chamber 20 22 24 26 and a piston rodside second
`working chamber 28 30 32 34 which are separated from
`one another by pistons located in the cylinder The first and
`the second working chambers 20 22 24 26 28 30 3234 are
`filled with a pressure medium which in the present case is a
`
`25
`
`hydraulic oil What
`the working cylinders
`is applicable to all
`12 14 16 18 is that a filling of the first working chamber 20
`22 24 26 or an emptying of the second working chamber 28
`a lowering of the associated wheel 4 6 8
`30 32 34 causes
`5 10 while the filling of the second working chamber 28 30
`32 34 or the emptying of the first working chamber 20 22
`24 26 causes a raising of the wheel 4 6 8 10
`The working cylinders 12 14 16 18 are connected to one
`lines Thus the first and the second
`another via coupling
`io working cylinder 12 and 14 are connected to one another via
`line 36 the second and the fourth working
`a first coupling
`cylinder 14 and 18 are connected to one another via a second
`coupling line 38 the fourth and the third working cylinder 18
`and 16 are connected to one another via a third coupling line
`15 40 and the third and the first working cylinder 16 and 12 are
`connected to one another via a fourth coupling line 42
`The first coupling line 36 connects the first working cham
`ber 20 of the first working cylinder 12 to the first working
`chamber 22 of the second working cylinder 14 The second
`20 coupling line 38 connects the second working chamber 30 of
`the second working cylinder 14 to the second working cham
`ber 34 of the fourth working cylinder 18 The third coupling
`line 40 connects the first working chamber 26 of the fourth
`working cylinder 18 to the first working chamber 24 of the
`third working cylinder 16 The fourth coupling line 42 con
`nects the second working chamber 32 of the third working
`cylinder 16 to the second working chamber 28 of the first
`working cylinder 12 The working cylinders 12 14 16 18
`form together with the coupling lines 36 38 40 42 a closed
`30 system
`The functioning of the road building machine according to
`the invention from FIG 1 is described below When the road
`building machine
`to the invention drives for
`according
`front wheel 4 of the chassis 2 over an
`example with the left
`35 obstacle of for example a height of 400 mm the piston in the
`first working cylinder 12 is retracted by 100 mm on account of
`the weight of the vehicle The pressure medium is thus
`pressed out of the first working chamber 20 of the first work
`ing cylinder 12 via the first coupling line 36 into the first
`40 working chamber 22 of the second working cylinder 14 In
`this case the pressure medium is pressed out of the second
`working chamber 32 of the third working cylinder 16 via the
`fourth coupling line 42 into the second working chamber 28
`of the first working cylinder 12 On account of the positive
`45 coupling the pistons in the second and the third working
`cylinder 14 16 are moved in the opposite direction to the
`piston of the first working cylinder 12 and by the same
`amount that is to say 100 mm Since the second and the third
`working cylinder 14 16 in turn are connected to the fourth
`so working cylinder 18 via the second and the third coupling line
`38 40 in the way described above this has the effect
`that the
`piston in the fourth working cylinder 18 is moved in the same
`direction and by the same amount as the piston of the first
`working cylinder 12 Thus the left front wheel 4 and the right
`rear wheel 10 are adjusted in height in the opposite direction
`to the right front wheel 6 and the left rear wheel 8 the left
`front wheel 4 and the right rear wheel
`10 being adjusted in
`height in the same direction and the height adjustment
`taking
`the wheels 4 6 8 10 It may be
`place by equal amounts on all
`60 noted that the pistons of the cylinders are moved by only 100
`mm while the height of the obstacle is 400 mm with the
`result that the driving comfort and stability are improved In
`level of the road building machine is
`this case the overall
`raised by 100 mm in this exemplary embodiment
`Further embodiments
`of
`road building machine
`the
`according to the invention are described below with reference
`to FIGS 2 to 4 and all have the same basic structure and
`
`55
`
`65
`
`Ex
`
`00010014
`
`

`

`Case 1:17-cv-00770-JDW Document 369-38 Filed 04/12/24 Page 16 of 22 PageID #: 34362
`
`US 7828309 B2
`
`8
`
`first
`
`7
`functioning as were described with reference to FIG 1 and
`therefore identical parts are given the same reference symbols
`and the above description applies correspondingly For this
`features of the further embodi
`reason only the additional
`ments are dealt with below
`In the second embodiment shown in FIG 2 the first cou
`line 40 via a
`pling line 36 is connected to the third coupling
`line 44 Furthermore the second coupling
`connecting
`line 38 is connected to the fourth coupling line 42 via a second
`connecting line 46 Moreover a first working line 48 is pro
`vided which is connected to the first connecting line 44 and
`a second working line 50 is provided which is connected to
`the second connecting line 46 The first and the second work
`ing line 48 50 issue into a pressure medium sump a pressure
`medium source 54 in the form of an oil pump being provided
`furthermore in the first working line 48
`The second embodiment has furthermore a valve control
`a first directional valve 56 in the first con
`which comprises
`necting line 44 a second directional valve 58 in the second
`line 46 and a third directional valve 60 in the
`connecting
`working lines 48 50 When the third directional valve 60 is
`into the position a while the first and the second
`brought
`directional valve 56 58 are opened pressure medium flows
`from the pressure medium source 54 via the corresponding
`lines into the second working chamber 28 30 32 34 of the
`working cylinders 12 14 16 18 In reaction the pressure
`medium is pressed out of the first working chamber 20 22 24
`26 of the working cylinders 12 14 16 18 and is discharged
`lines into the pressure medium sump
`via the corresponding
`52 In this first
`operating mode the positive coupling
`described above is consequently
`canceled briefly and the
`wheels 4 6 8 10 are raised by equal amounts In a second
`operating mode in which the third directional valve 60
`assumes the position B while the first and the second direc
`tional valve 56 58 are opened conversely
`a lowering of the
`wheels 4 6 8 10 by equal amounts takes place As a result of
`the second and the third directional
`the closing of the first
`valve 56 58 60 as illustrated in FIG 2 the valve control can
`be brought again into an operating mode in which the positive
`coupling described above is restored
`The directional valves are preferably electromechanically
`actuated valves The devices required for actuating the valves
`are generally known to a person skilled in the art Preferably
`the valves are spring prestressed so that after the height
`correction of the building machine they assume their initial
`The
`position again as soon as they are no longer activated
`road building machine then behaves in the same way as in the
`first exemplary embodiment
`FIG 3 shows a third embodiment of the road building
`machine according
`to the invention the third embodiment
`resembling the second and the first embodiment and there
`for iden
`fore the same reference symbols are used hereafter
`tical parts the preceding description applying correspond
`from the embodiments
`ingly and only the differences
`described above being dealt with below This embodiment
`allows the individual activation of all the wheels so that
`is
`possible to predetermine exactly a b