(12) United States Patent
`Bauer et al.
`
`USOO6773312B2
`US 6,773,312 B2
`Aug. 10, 2004
`
`(10) Patent No.:
`(45) Date of Patent:
`
`(54) ELECTRICAL PRESSURE CONTACT
`(75) Inventors: Monika Bauer, Bruchsal (DE); Frank
`Moskob, Karlsruhe (DE); Robert Dost,
`Olbronn (DE); Bernd Schumann,
`Bretten (DE); Andreas Kainz,
`Heilbronn (DE); Jirgen Veit, Bretten
`(DE)
`(73) Assignee: era-contact GmbH, Bretton (DE)
`(*) Notice:
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 0 days.
`
`(21) Appl. No.: 10/226,401
`(22) Filed:
`Aug. 23, 2002
`(65)
`Prior Publication Data
`US 2003/0049974 A1 Mar. 13, 2003
`Foreign Application Priority Data
`(30)
`Sep. 4, 2001
`(DE) ......................................... 101 43 200
`(51) Int. Cl. .................................................. HO1R 4/24
`(52) U.S. Cl. ........................ 439/824; 439/816; 439/840
`(58) Field of Search ................................. 439/824, 819,
`439/840, 846, 848, 10,842, 877, 29
`
`(56)
`
`References Cited
`U.S. PATENT DOCUMENTS
`
`2,724,096 A 11/1955 Klostermann ............... 339/255
`3,813,772 A
`6/1974 Adams ........................ 29/624
`4,743,201. A
`5/1988 Robinson et al. ........... 439/103
`
`
`
`5,641,315 A
`
`6/1997 Swart et al. ................ 439/824
`
`FOREIGN PATENT DOCUMENTS
`
`DE
`27 23 731 A1 11/1978
`DE
`43 17 255 C2
`1/1996
`EP
`O 435 408 B1
`7/1991
`FR
`2545.993 A1 11/1984
`* cited by examiner
`
`Primary Examiner Alex Gilman
`(74) Attorney, Agent, or Firm McCormick, Paulding &
`Huber LLP
`ABSTRACT
`(57)
`An electrical pressure contact includes a housing sleeve with
`an end facing the contact and an end facing away from the
`contact, a contact pin axially Slidably Supported in the
`housing Sleeve, which pin extends out of the housing sleeve
`at the Side facing the contact, which pin is a pushable into
`the housing sleeve against the biasing force of the a biasing
`element arranged in the housing sleeve, and through the
`conductive body of which pin the electrical contact is made,
`a terminal piece for fastening to an electrical Supply con
`ductor at the end of the housing facing away from the
`contact, and an axially flexible electrical conductor arranged
`in the housing sleeve between the terminal piece and the
`contact pin. The flexible electrical conductor is at its end
`facing the contact clamped into an axial bore formed in the
`end of the contact pin facing away from the contact and at
`its end facing away from the contact is clamped in an axial
`bore formed in the end of the terminal piece facing the
`COntact.
`
`16 Claims, 3 Drawing Sheets
`
`GHD
`1032
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`U.S. Patent
`
`Aug. 10, 2004
`
`Sheet 1 of 3
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`US 6,773,312 B2
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`10
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`24
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`U.S. Patent
`
`Aug. 10, 2004
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`Sheet 2 of 3
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`US 6,773,312 B2
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`T,
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`U.S. Patent
`
`Aug. 10, 2004
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`Sheet 3 of 3
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`US 6,773,312 B2
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`11
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`12
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`FIG 3
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`1
`ELECTRICAL PRESSURE CONTACT
`
`US 6,773,312 B2
`
`CROSS-REFERENCE TO RELATED
`APPLICATIONS
`This application is entitled to the benefit of and incorpo
`rates by reference essential Subject matter disclosed in
`German Patent Application No. 101 43 200.3 filed on Sep.
`4, 2001.
`
`FIELD OF THE INVENTION
`The present invention concerns an electrical pressure
`contact, including:
`a housing sleeve with a contact facing end and an end
`facing away from the contact,
`a contact pin axially slidably Supported in the housing
`sleeve, which contact pin extends out of the contact
`facing end of the housing sleeve, is pushable into the
`housing sleeve against the biasing force of a biasing
`element arranged in the contact sleeve, and through
`whose conductive body the electrical contact is made,
`a terminal piece for the fastening of an electrical Supply
`conductor to the end of the housing sleeve facing away
`from the contact, and
`a flexible electrical conductor arranged in the housing
`sleeve between the terminal piece and the contact pin.
`
`BACKGROUND OF THE INVENTION
`Electrical pressure contacts of this type serve, for
`example, to conduct current between elements which are
`movable relative to one another. Therefore the contact pin
`has a two-fold function: On one hand it can make a Spring
`loaded mechanical contact with an opposite contact movable
`relative to the housing Sleeve. On the other hand, an elec
`trical contact can be made through its current conducting
`body. Electrical pressure contacts of this type are used in
`large numbers, especially in railroad couplings.
`In customary electrical pressure contacts of the above
`mentioned kind, the flexible electric conductor is formed by
`Strands, which are rigidly Soldered to the contact pin and to
`the terminal piece. Generally, Several Strands are pleated and
`are So pre-twisted that they can accommodate a pushing of
`the contact pin into the housing sleeve without the Strands
`becoming bucked, to avoid damage to the Strands.
`Nevertheless, in customary electrical pressure contacts, as a
`result of a large number of contact reciprocations, the
`Strands unfortunately often become damaged, especially
`broken. Moreover, the making of Such electrical pressure
`contacts is relatively time consuming and expensive.
`EP-O-435 408 B1 shows an electrical pressure contact
`intended to avoid these problems. In a case of this pressure
`contact, no Stranded conductors are used. Instead of this, the
`contact pin is partially formed as a hollow cylinder whose
`wall is provided with several longitudinal slots, whereby
`wall Sectors are achieved which are formed as Springy,
`current conducting contact tongues. These contact tongues,
`on their inner Sides, lie Slidable on a current conducting
`housing sleeve, So that current can flow through the contact
`tongues and the housing sleeve to the terminal piece. The
`making of Such a Stranded conductor-free pressure contact
`is, however, Similarly expensive.
`DE-4-317 255 C2 shows an electrical pressure contact for
`completely-automatic or Semi-automatic railroad vehicle
`coupling with a housing sleeve of plastic and a sliding sleeve
`
`2
`Slidably Supported in the housing Sleeve, which sliding
`sleeve transitions into a hollow formed contact pin. A
`metallic contact sleeve is insertable into this hollow contact
`pin from the outside, which metallic contact sleeve at its
`contact facing Side carries a contact plate, and at its side
`facing away from the contact is crimped to a cable end. In
`this type of pressure contact, the contact pin therefore
`creates only a mechanical contact, while the electric contact
`has to be created through a conductor positioned in the
`interior of the contact pin. Such a construction requires
`therefore an increased number of construction components
`and a more expensive assembly, which increases the pro
`duction costs.
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`SUMMARY OF THE INVENTION
`The invention has as its object the provision of an
`electrical pressure contact of the previously mentioned kind,
`which is of Simple construction, can be made economically,
`and which has a long Service life, that is, can withstand an
`especially high number of contact reciprocations without
`damage.
`This object is solved by way of an electrical pressure
`contact of the aforementioned kind in that the braided
`tubular conductor at its end facing the contact is clamped in
`a bore formed in the end of the contact pin facing away from
`the contact, and at its end facing away from the contact is
`clamped into an axial bore formed in the end of the terminal
`piece facing the contact.
`Further, the respective Sections of the contact pin and of
`the terminal piece into which the conductor ends are inserted
`in the bores, are pressed radially inwardly and with a
`preSSure which is So measured that the braided tubular
`conductor on one hand is Sufficiently clamped So that it
`cannot become loosened and provides a good electrical
`contact, and on the other hand that the braided tubular
`conductor is not damaged by the pressing. This type of
`fastening is called crimping.
`By the direct crimping of the conductor with the contact
`pin and with the terminal piece, the construction of the
`electrical pressure contact of the invention is simple and its
`manufacture is economical. Especially, its manufacture is
`Significantly leSS expensive than in the case of Soldered
`connections.
`In contrast to a pressure contact with Soldered
`connections, the preSSure contact of the invention has a
`higher Service life. For one thing, with an overheating of a
`Soldered pressure contact, the danger exists that the Solder
`becomes plastic and the Stranded conductor “unsolders
`itself, that is, the connection becomes unmade. AS another
`thing, in the case of a Soldered Stranded conductor, the
`danger of breakage is higher than in the case on a crimped
`Stranded conductor. Among other things, that is because in
`the case of Soldering Solder can penetrate from the Soldered
`location through the flexible conductor and stiffen the flex
`ible conductor with the result that the flexible conductor is
`easily broken by the axial movement of the contact pin.
`In a preferred embodiment the biasing mechanism is
`formed by a helical Spring.
`In a preferred embodiment, the flexible electrical conduc
`tor is formed by a braided tubular conductor. A braided
`tubular conductor having at least Some degree of flexibility
`can fan out under axial loading and in this way can accom
`modate the axial loading without the Strands of the Stranded
`conductor becoming buckled and thereby broken. Since a
`braided tubular conductor is compressible in the axial
`direction, it can be simply arranged along the housing sleeve
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`3
`axis. This represents a large Simplification in comparison to
`the Stranded conductors used in customary pressure
`contacts, which for example are assembled with a given
`preliminary twisting between the contact pin and the termi
`nal piece So that they upon axial loading lie together in
`loops. To make Such a preliminary twisting, the contact pin
`must always be rotated in a given way relative to the
`terminal piece. This requires means for holding the contact
`pin in the rotated position. In the pressure contact of the
`invention with a braided tubular conductor Such means are
`however not required, which benefits a simple construction
`of the pressure contact.
`In an advantageous development, the flexible electrical
`conductor is a braided tubular conductor made of Strands of
`copper. A braided tubular conductor can especially well
`accommodate an axial compression without thereby becom
`ing damaged. A braided tubular conductor can therefore be
`designed relatively large while Still providing a Sufficient
`flexibility. That is, it can indude a large number of Strands So
`that the electrical resistance of the pressure contact is
`lowered.
`In a further preferred embodiment, the flexible electrical
`conductor is formed by the helical Spring. This spring can in
`a way Similar to the described Stranded conductor be
`crimped to the contact pin and to the terminal piece. This
`leads to a yet simpler construction of the pressure contact
`and to a yet lower manufacturing cost. Moreover, Such type
`of pressure contact is of a significantly higher Service life
`because the danger of breaking the flexible conductor by
`reciprocations of the contact is practically foreclosed.
`In the event the helical Spring does not serve for the
`transmission of current, the terminal piece in a preferred
`embodiment has a first cylindrical Section facing the contact
`which is arranged coaxial with the housing sleeve and is
`received in the end of the helical Spring facing away from
`the contact. Thereby, the helical Spring, at its end facing
`away from the contact, is held in position in a simple way.
`The contact pin preferably has in its circumferential
`Surface a Surrounding groove arranged perpendicularly to
`the pin axis, in which groove a locking ring is received,
`which locking ring on its side facing the contact forms a stop
`for an inwardly facing radial shoulder on the end of the
`sleeve facing the contact, and which locking ring on its side
`facing away from the contact forms a Stop for the Spring. If
`the Spring is not crimped to the contact pin for the trans
`mission of current, it sits on the Side of the locking ring
`facing away from the contact and thereby presses the contact
`pin in the contact direction. The movement of the contact pin
`in the contact direction is limited in that the side of the
`locking Spring facing the contact engages the inwardly
`facing Shoulder of the housing sleeve. The construction with
`the locking ring and groove is decidedly simple and eco
`nomical to make. Especially, the contact pin, except for the
`groove, can have a simple cylindrical circumference which
`is favorable for its manufacture.
`In an advantageous way, the terminal piece has a Second
`cylindrical Section whose diameter corresponds to the inter
`nal diameter of the housing sleeve and which has a crimping
`Surface over which the housing sleeve is crimped. Such a
`crimped connection between the terminal piece and the
`housing sleeve is robust and economical to manufacture.
`In an advantageous further development, the mentioned
`crimping Surface has a Surrounding groove. The housing
`sleeve is pressed into this groove and is thereby rigidly
`connected with the terminal piece.
`Preferably the terminal piece has on the side of the second
`cylindrical Section facing away from the contact an axially
`arranged threaded bolt for connection to the electrical Supply
`conductor.
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`US 6,773,312 B2
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`4
`Preferably the contact pin has a rounded contact Surface
`facing the contact. The rounding of the contact Surface has
`the effect that the contact pin can make contact with an
`opposed contact Surface even if it does not exactly perpen
`dicularly encounter the opposing contact Surface. In a pre
`ferred further development, the rounded contact Surface is
`gold-plated to avoid corrosion which would impair the
`electrical contact.
`In a further preferred embodiment, a contact pin of Silver
`is inserted into the end of the contact pin facing the contact.
`By way of Such a contact pin, a very well conducting,
`corrosion resisting contact is formed. In an advantageous
`further development the contact pin has a gold-plated con
`tact Surface.
`In a preferred embodiment, the housing sleeve contact pin
`and terminal piece are made of brass with a Small amount of
`lead, especially from CuZn38Pb2. Such a material is suffi
`ciently conductive, economical, machinable, and crimpable
`after a Suitable heat treatment. It allows therefore a simple,
`rapid, and economical manufacture of the pressure contact.
`A housing sleeve made of this material is in the case of
`Similar wall thicknesses significantly more stable than one
`made of plastic. Such an electrical preSSure contact has in
`itself, that is, without the inclusion of a plastic plate or the
`like, a high Stability and is therefore universally usable.
`BRIEF DESCRIPTION OF THE DRAWINGS
`Further advantages and features of the inventive Solution
`will be apparent from the following description, which in
`combination with the accompanying drawings, explain the
`invention by way of three exemplary embodiments. The
`drawings are:
`FIG. 1 a longitudinal Section through an electrical pres
`Sure contact embodying the invention with a braided tubular
`conductor and a gold-plated contact Surface,
`FIG. 2 a longitudinal Section through an pressure contact
`embodying the invention with a braided tubular conductor
`and a silver contact pin,
`FIG. 3 A longitudinal Section through an electrical pres
`Sure contact embodying the invention in which the braided
`tubular conductor between the contact pin and the terminal
`piece is formed by the helical Spring which biases the
`contact pin.
`DETAILED DESCRIPTION OF THE
`PREFERRED EMBODIMENTS
`FIGS. 1 through 3 show different embodiments of elec
`trical pressure contacts embodying the invention with a
`housing Sleeve 1, which housing sleeve has a contact facing
`end (upper in FIGS. 1 to 3) and an end (lower in FIGS. 1 to
`3) facing away from the contact. The housing sleeve axis is
`indicated by the reference number 10.
`A contact pin2 is axially slidably Supported in the housing
`sleeve 1. This contact pin is biased in the contact direction
`by a helical Spring 4.
`The contact pin has a Surrounding groove 11 in its
`circumferential Surface, which groove is oriented perpen
`dicular to the axis 10. A locking ring 6 is received in this
`groove, which locking ring, with its Side facing the contact
`(upper side in FIGS. 1 through 3) can come into engagement
`with a radial inwardly facing shoulder 12 of the housing
`sleeve. By way of the locking ring 6 and the housing sleeve
`shoulder 12, the movability of the contact pin in the contact
`direction is limited.
`In FIGS. 1 and 2, the helical Spring 4 engages the Side of
`the locking ring 6 facing away from the contact. At the end
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`US 6,773,312 B2
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`of the housing Sleeve 1 facing away from the contact, the
`housing sleeve 1 is closed by a terminal piece 3. In FIGS. 1
`and 2, the helical Spring engages this terminal piece 3 with
`its end facing away from the contact. The terminal piece 3
`has a first cylindrical Section 13 facing the contact, the
`diameter of which is Smaller than the internal diameter of the
`spring 4. In FIGS. 1 and 2, this cylindrical section 13 is
`received in the Spring 4 and holds the Spring in position.
`The terminal piece 3 has a Second cylindrical Section 14,
`the diameter of which corresponds to the internal diameter
`of the housing Sleeve 1. On its cylindrical circumferential
`Surface is a Surrounding groove 15. The circumferential
`Surface of the cylindrical Section 14, with its Surrounding
`groove 15, forms a crimping Surface over which housing
`sleeve 11 is crimped. To the side of the cylindrical section 14
`facing away from the contact is connected an axially
`arranged threaded bolt 16 to which an electrical Supply
`conductor can be connected in a known way. The biased
`contact pin 2 of the described kind can therefore make a
`Spring loaded mechanical pressure contact with an opposite
`contact. In the illustrated examples of pressure contacts
`embodying the invention, the contact pin 2 and the terminal
`piece 3 are made of CuZn38Pb2. This material is sufficiently
`conductive to create an electrical contact through contact pin
`2 and terminal piece 3. Contact pin 2 and terminal piece 3
`are connected by way of an axially flexible electrical con
`ductor.
`In FIGS. 1 and 2, the flexible electric conductor is formed
`by a flexible braided stranded tube of copper to provide the
`resulting braided tubular conductor 5. This braided tubular
`conductor 5 has one end inserted into a bore 20 in the contact
`pin 2 and has its other end inserted into a bore 21 in the
`terminal piece 3, and each end is rigidly damped in its
`respective bore 20 or 21. That is, the corresponding Sections
`of the contact pin 2 and of the terminal piece 3 with the
`inserted braided tubular conductor 5 are pressed radially
`inwardly and with a pressure which is So measured that the
`strands of the braided tubular conductor 5 are rigidly enough
`pinched that they cannot loosen and that a good electrical
`contact is Supplied, without on the other hand these Strands
`being damaged by the preSSure. This type of fastening is
`called crimping.
`By way of the direct crimping of the braided tubular
`conductor 5 with the contact pin and with the terminal piece,
`the pressure contact of the invention distinguishes itself
`from customary pressure contacts in which a cable or
`Stranded wire is rigidly Soldered to the contact pin and to the
`terminal piece. The crimping of the Strands offers, in com
`parison to a Soldering of the Strands, the advantage that in
`50
`manufacturing it is less expensive and the Service life of the
`preSSure contact is increased. For in the case of a Soldered
`Strand there exists the danger that in the event of overheating
`the pressure contact may become unsoldered. Moreover, the
`stranded cable can become stiffened by the solder and
`therefore more easily breakable.
`In use of a pressure contact, the contact pin 2 is pushed
`into the housing sleeve 1 and the braided tubular conductor
`5 is axially compressed. Such an axial compression can be
`optimally accommodated by the braided tubular conductor 5
`in that it fans out. This therefore avoids the individual
`strands of the braided tubular conductor 5 becoming kinked
`and breaking whereby the service life of the electrical
`preSSure contact of the invention is increased.
`In the case of customary preSSure contacts, generally
`Several Stranded conductors are pleated and are assembled
`with the housing sleeve 1 with a given preliminary twist, So
`
`6
`that upon axial compression they lie in loops without
`buckling. In connection with this it must be assured that the
`contact pin2 is held at a given fixed angular position relative
`to the housing 1. A customarily used rotation guard for this
`purpose is therefore not required with the braided tubular
`conductor 5 of the pressure contact of the invention, which
`Simplifies the construction and reduces the manufacturing
`costs. Since a braided tubular conductor 5 can especially
`well accommodate an axial compression, it can be designed
`entirely larger, that is, to contain a larger number of con
`ductor Strands, without it becoming too stiff and therefore
`Susceptible to failure. Therefore the pressure contact with
`the braided tubular conductor 5 of the invention can be
`designed especially for the transmission of higher currents.
`In a further embodiment of the pressure contact of the
`invention, the braided tubular conductor between the contact
`pin 2 and the terminal piece 3 is formed alone by the helical
`Spring 4, which at the same time biases the contact pin 2.
`One such electrical pressure contact is illustrated in FIG. 3.
`The contact pin 2 has on its side facing away from the
`contact an axial bore 22, and the terminal piece 3 on its side
`faring the contact has and axial bore 23. The ends of the
`Spring 4 are received in these bores and are crimped to the
`contact pin and the terminal piece respectively. Such con
`Struction is simple and of high Service life because the Spring
`4 is not Sensitive to compression.
`In FIG. 1, the contact pin 2 has a rounded gold-plated
`contact Surface 24. Because of the rounding, a good elec
`trical contact can be made through this contact Surface with
`an opposite contact Surface, even if the contact pin 2 does
`not encounter the opposite contact Surface entirely perpen
`dicularly. Alternatively, the contact pin 2 can be provided
`with a silver pin 7, which is illustrated in FIGS. 2 and 3. The
`silver pin 7 has an elongated section 25 by means of which
`it is received in an axial bore 26 of the contact pin 2. The pin
`further has a head 27 with a pre-curved contact surface
`facing toward the contact, which contact Surface can like
`wise be gold plated.
`In all of the described embodiments, the electrical pres
`Sure contact of the invention is distinguished by a simple
`construction of a few simply made and quickly and eco
`nomically assembled pieces. For example, the contact pin in
`FIGS. 1 and 2 has an essentially cylindrical form, which in
`the illustrations is narrowed down only as a result of the
`crimping with the braided tubular conductor 5. This espe
`cially requires no two-part construction with Sections of
`different diameters to provide a stop for the shoulder 12. The
`terminal piece 3 makes possible at the same time the
`fastening of the braided tubular conductor 5 and/or Spring 4,
`the closure of the housing sleeve 1 by means of the cylin
`drical crimp surface provided with the groove 15, and the
`connection of a supply conductor by a threaded bolt 16. The
`crimped connection shown in the illustrations between the
`Second cylindrical Section 14 of the terminal piece 3 and the
`housing sleeve 1 is quickly and economically made and is
`very robust. In the illustrated examples the housing sleeve 1
`is likewise made of CuZn38Pb2, which is economical,
`machinable, current conducting and crimpable, and thereby
`permits a rapid, Simple and economical manufacture of the
`electrical pressure contact of the invention.
`What is claimed is:
`1. An electrical pressure contact, comprising:
`a housing sleeve with a contact facing end and an end
`facing away from the contact,
`a contact pin Slidably Supported in the housing sleeve,
`which pin at the contact facing Side of the housing
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`7
`sleeve protrudes out of the housing sleeve, is pushable
`into the housing sleeve against the bias of a biasing
`element arranged in the housing sleeve, and through its
`conductive body an electrical contact is made,
`a terminal piece at the end of the housing sleeve facing
`away from the contact for the fastening of an electric
`Supply conductor, and
`an axially flexible electric conductor arranged in the
`housing sleeve between the terminal piece and the
`contact pin, Said flexible electric conductor being a
`braided tubular conductor,
`characterized in that the flexible electric conductor at its end
`facing the contact is clamped in an axial bore in the end of
`the contact pin facing away from the contact and at its end
`facing away from the contact is clamped in an axial bore
`formed in the end of the terminal piece facing the contact.
`2. An electrical pressure contact according to claim 1,
`further characterized in that the housing sleeve, the contact
`pin, and the terminal piece are made of brass with a Small
`amount of lead, especially of CuZn38Pb2.
`3. An electrical pressure contact according to claim 1,
`further characterized in that the braided tubular conductor
`comprises Strands of a conductor material.
`4. An electrical pressure contact according to claim 3,
`further characterized in that the conductor material of the
`braided tubular conductor comprises Strands of copper.
`5. An electrical pressure contact according to claim 1,
`further characterized in that the contact pin has a rounded
`contact Surface facing the contact.
`6. An electrical pressure contact according to claim 5,
`further characterized in that the contact Surface is gold
`plated.
`7. An electrical pressure contact according to claim 1,
`further characterized in that a contact pin of Silver is inserted
`into the end of the contact pin facing the contact.
`8. An electrical pressure contact according to claim 7,
`further characterized in that the contact pin has a gold-plated
`contact Surface.
`9. An electrical pressure contact according to claim 1,
`further characterized in that the terminal piece has a Second
`
`15
`
`25
`
`35
`
`US 6,773,312 B2
`
`8
`cylindrical Section whose diameter corresponds to the inter
`nal diameter of the housing sleeve and has a crimping
`Surface over which the housing Sleeve one is crimped.
`10. An electrical preSSure contact according to claim 9,
`further characterized in that the crimping Surface has a
`groove Surrounding the Second cylindrical Section.
`11. An electrical pressure contact according to claim 9,
`further characterized in that the terminal piece on the Side of
`the Second cylindrical Section facing away from the contact
`has an axially arranged threaded bolt for connection with the
`electrical Supply conductor.
`12. An electrical preSSure contact according to claim 1,
`further characterized in that the biasing element is a helical
`Spring.
`13. An electrical pressure contact according to claim 12,
`further characterized in that the terminal piece has a first
`cylindrical Section facing the contact, which first cylindrical
`Section is arranged coaxial with the housing sleeve and is
`received in the helical Spring.
`14. An electrical pressure contact according to claim 12,
`further characterized in that the contact pin has in its
`circumferential Surface a Surrounding groove arranged per
`pendicularly to the contact pin axis, in which groove a
`locking ring is received, which locking ring on its side
`facing the contact forms a stop for a radial inwardly facing
`shoulder on the end of the housing facing the contact and on
`its Side facing away from the contact forms a stop for the
`Spring.
`15. An electrical pressure contact according to claim 12,
`further characterized in that the flexible electric conductor is
`formed by the helical Spring.
`16. An electrical pressure contact according to claim 15,
`further characterized in that the contact pin in its circum
`ferential Surface has a Surrounding groove arranged perpen
`dicularly to the pin axis in which a locking ring is received,
`which locking ring on its side facing the contact forms a stop
`for a radial inwardly facing shoulder at the end of the
`housing facing the contact.
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`Page 8 of 8 (PGR2021-00078)
`G&H DIVERSIFIED MANUFACTURING, LP v. DYNAENERGETICS EUROPE GMBH
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`Page 8 of 8 (PGR2021-00078)
`G&H DIVERSIFIED MANUFACTURING, LP v. DYNAENERGETICS EUROPE GMBH
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