EP0487018B1 - Elément de contact à ressort - Google Patents

Elément de contact à ressort Download PDF

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Publication number
EP0487018B1
EP0487018B1 EP91119693A EP91119693A EP0487018B1 EP 0487018 B1 EP0487018 B1 EP 0487018B1 EP 91119693 A EP91119693 A EP 91119693A EP 91119693 A EP91119693 A EP 91119693A EP 0487018 B1 EP0487018 B1 EP 0487018B1
Authority
EP
European Patent Office
Prior art keywords
sleeve
spring
piston
contact pin
guide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91119693A
Other languages
German (de)
English (en)
Other versions
EP0487018A1 (fr
Inventor
Josef Gramer
Michael Seelinger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Feinmetall GmbH
Original Assignee
Feinmetall GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Feinmetall GmbH filed Critical Feinmetall GmbH
Publication of EP0487018A1 publication Critical patent/EP0487018A1/fr
Application granted granted Critical
Publication of EP0487018B1 publication Critical patent/EP0487018B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
    • H01R11/11—End pieces or tapping pieces for wires, supported by the wire and for facilitating electrical connection to some other wire, terminal or conductive member
    • H01R11/18—End pieces terminating in a probe

Definitions

  • the invention relates to a spring contact pin according to the preamble of claim 1.
  • Spring contact pins are known which are used, for example, for contacting test points on a circuit board to be tested. They connect the connections of a test device with the test points mentioned, the test device checking the conductor track formation of the printed circuit board for perfect function. Of course, further areas of use of such spring contact pins are also conceivable, but these will not be dealt with in detail here.
  • a known spring contact pin is designed as a rotary spring contact pin. Its contact part is provided with a helix that extends approximately to the contact point.
  • the edge region (outlet region of the contact part) of a sleeve, which receives a helical compression spring and guides a piston of the contact part, is flanged in the direction of the interior of the sleeve in such a way that a guide for the helix is formed. If the contact part is axially displaced relative to the sleeve, the guide causes the helix to rotate.
  • the piston which essentially carries out the current transmission from the contact part to the sleeve, is subject to only a relatively small and even wear, so that the electrical properties of the rotary spring contact pin remain approximately constant over its life.
  • the known rotary spring contact pin has the disadvantage that there is a tendency to increase the wobble play of the contact part relative to the sleeve; that is, the clearance between the above-mentioned parts increases, in particular with larger transverse forces, so that both the electrical and the mechanical properties deteriorate.
  • a spring contact pin which has a contact part which is provided with a slot on the end side, in order to enable it to be pushed into a sleeve provided with an inwardly projecting, pressed-in projection.
  • Both the sleeve and the contact part are circular cylindrical, so that the contact part can assume any rotational position within the sleeve.
  • DE-A-3 332 187 discloses a contact module whose sleeve has a cross-sectional contour which, together with an area of a contact part located within the sleeve, forms an anti-rotation device. Such a contact module requires expensive special sleeves to form this anti-rotation device.
  • the invention has for its object to provide a spring contact pin, the contact part is guided precisely and in a simple manner in the sleeve.
  • the projection forms a rotation lock for the guide part, which is designed as a polygonal bar, in particular triangular bar or square bar, with flat surfaces.
  • the design of the guide part as a polygonal rod results in a heavy-duty rotation lock for the contact part.
  • the guide member has a smaller diameter than the piston and the guide section, so that the projection forms a stop for the piston in the fully sprung-out position of the spring contact pin and a stop for the guide section in the fully sprung-in position of the spring contact pin.
  • the projection protruding into the interior of the sleeve takes on a multiple function in that it not only brings about the anti-rotation device but also the two stop positions of the spring contact pin.
  • the protrusion is formed by a crimping of the wall of the sleeve. As seen in the longitudinal section of the spring contact pin, the sleeve is thus drawn in in a step-like manner, as a result of which material solidification takes place at this point.
  • the guide part can be designed as a triangular bar. According to a further embodiment, however, it is also possible for the guide part to be designed as a square rod.
  • the piston is arranged at one end of the guide part and the guide section is arranged at the other end of the guide part.
  • the guide part thus goes directly into the other two components mentioned.
  • the end face of the piston is acted upon by the helical compression spring.
  • the end face preferably has a conical shape.
  • the piston has the same diameter as the guide section. This makes it possible to use a sleeve with the same inside diameter over its length (apart from the projection design).
  • the side forces on the contact part which may occur during deflection are absorbed by the projection formation and do not act in the edge region of the sleeve, but are effective due to the position of the guide part in a section located far from the edge region of the sleeve. Due to the distance from the edge area, the sleeve has a much greater mechanical strength here, so that - even when relatively large lateral forces occur on the contact part - there are no undesirable deformations which would lead to an increase in wobble.
  • the Contact part of the spring contact pin according to claim 4 is guided on both sides of the guide part within the sleeve, this being done on the one hand by means of the piston and on the other hand by means of the guide section, so that there is a construction that guarantees precise properties and high resilience.
  • the bearing of the guide part which can introduce relatively large forces into the sleeve wall, lies far from the edge region of the sleeve and can consequently absorb large stresses without self-deformation or deformation of the sleeve.
  • the drawing illustrates the invention with the aid of an exemplary embodiment, namely the figure shows a longitudinal section through a spring contact pin.
  • the spring contact pin 1 has a sleeve 2 which has an open edge region 4 at one end 3 and an end wall 6 closing it at its other end 5. It consists of an electrically conductive material, in particular metal.
  • a contact part 7 is guided axially inside the sleeve 2.
  • the contact part 7 has at one end a piston 8, to which a guide part 9 designed as a square rod 16 connects, which merges into a circular-cylindrical guide section 10.
  • the contact part 7 has a contact head 11, which is provided with a contact point 12.
  • the piston 8 has a conical end face 13 at its end facing away from the guide part 9.
  • the outer surface 14 of the piston 8 has one circular cross section (circular cylinder), as well as the inner wall 15 of the sleeve 2.
  • the guide part 9, which has a smaller diameter than the piston 8, is designed as a square rod 16.
  • the piston 8 merges with the ring part 17 into the guide part 9 due to the different diameters.
  • an annular step 18 is in turn formed, which leads to the larger-diameter guide section 10.
  • the diameter of the guide section 10, which is circular in cross section, is the same size as the diameter of the piston 8.
  • the contact head 11 has a round section 19 which is larger in diameter than the guide section 10 and merges into a triangular tip 20. This has the contact point 12.
  • the sleeve 2 has a projection arrangement 21 which interacts with the guide part 9.
  • the projection arrangement 21 is formed by four projections 22, which are distributed uniformly over the circumference of the sleeve 2 and which are created by flanging the wall 23 of the sleeve 2 inwards.
  • Each projection 22 interacts with a surface of the guide part 9 designed as a square rod 16.
  • a collar 24 protruding from the outer surface of the sleeve 2 is formed. This serves to fix the spring contact pin 1 within a device, not shown.
  • a helical compression spring 25 is arranged in the interior of the sleeve 2 and is supported with an end region on the end face 13 of the piston 8.
  • the contact part 7 is always acted upon axially by the force of the helical compression spring 25, also in the spring-loaded position shown in the figure.
  • the contact part 7 is secured against rotation due to the guide part 9 designed as a cylindrical square rod 16 (or polygonal rod). When the contact part 7 is deflected, it is thus ensured that the contact head 11 maintains a constant angular position relative to the sleeve 2.
  • the piston is preferably made of copper beryllium and is galvanically nickel-plated and gold-plated.
  • the sleeve is preferably made of nickel silver and is gold-plated.
  • the helical compression spring 25 is made of silver-plated spring steel. Particularly good properties result when the helical compression spring has a preload of 60 cN in the fully extended position of the rotary spring contact pin 1. After a spring travel of about 6.5 mm, the spring force is preferably 150 cN. Overall, a maximum spring travel of approximately 8 mm is provided.

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  • Measuring Leads Or Probes (AREA)

Claims (4)

  1. Tige de contact à ressort (1), avec un élément de contact (7) électriquement conducteur, pouvant être déplacé axialement dans un manchon électriquement conducteur (2) et pourvu d'un piston (8), élément qui est sollicité axialement par la force d'un ressort de pression à boudin (25) disposé dans le manchon (2), présente à son extrémité libre, située en dehors du manchon (2), un point de mise en contact (12) et possède une partie de guidage (9) qui, lors d'un déplacement axial de l'élément de contact (7), coopère, en vue de l'association relative de l'élément de contact (7) par rapport au manchon (2), avec au moins une saillie (22) qui est formée par un rabattement vers l'intérieur de la paroi (23) du manchon (2), la partie de guidage (9) présentant un plus petit diamètre que le piston (8) et qu'un tronçon de guidage (10) et la saillie (22) constituant une butée pour le piston (8) dans la position totalement sortie de la tige de contact à ressort (1) et une butée pour le tronçon de guidage (10) dans la position totalement rentrée de la tige de contact à ressort (1), et la partie de guidage (9) étant disposée à l'intérieur du manchon (2) et l'élément de contact (7) présentant entre la partie de guidage (9) et le point de mise en contact (12) le tronçon de guidage (10) de forme de section circulaire, qui est monté dans la région terminale associée du manchon (2), caractérisée en ce que la saillie (22) forme un blocage en rotation pour la partie de guidage (9), qui est réalisée sous la forme d'un barreau polygonal, notamment d'un barreau triangulaire ou d'un barreau carré (16), à faces planes.
  2. Tige de contact à ressort selon la revendication 1, caractérisée en ce que le piston (8) est disposé à une extrémité de la partie de guidage (9) et le tronçon de guidage (10) à l'autre extrémité de la partie de guidage (9).
  3. Tige de contact à ressort selon l'une des revendications précédentes, caractérisée en ce que le côté frontal (13) du piston (8) est sollicité par le ressort de pression à boudin (25).
  4. Tige de contact à ressort selon l'une des revendications précédentes, caractérisée en ce que le piston (8) présente le même diamètre que le tronçon de guidage (10).
EP91119693A 1990-11-20 1991-11-19 Elément de contact à ressort Expired - Lifetime EP0487018B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9015855U DE9015855U1 (de) 1990-11-20 1990-11-20 Federkontaktstift
DE9015855U 1990-11-20

Publications (2)

Publication Number Publication Date
EP0487018A1 EP0487018A1 (fr) 1992-05-27
EP0487018B1 true EP0487018B1 (fr) 1995-08-02

Family

ID=6859542

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91119693A Expired - Lifetime EP0487018B1 (fr) 1990-11-20 1991-11-19 Elément de contact à ressort

Country Status (2)

Country Link
EP (1) EP0487018B1 (fr)
DE (2) DE9015855U1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29519413U1 (de) * 1995-12-07 1996-01-25 TSK Prüfsysteme GmbH, 32457 Porta Westfalica Prüfstift
JP7098886B2 (ja) * 2017-07-04 2022-07-12 日本電産リード株式会社 接触端子、検査治具、及び検査装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4289367A (en) * 1979-12-10 1981-09-15 John Fluke Mfg. Co., Inc. Spring loaded connector pin
US4504780A (en) * 1982-08-25 1985-03-12 Marsella John R Test probe
US5009613A (en) * 1990-05-01 1991-04-23 Interconnect Devices, Inc. Spring contact twister probe for testing electrical printed circuit boards

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Jahrbuch der deutschen Gesellschaft für Chronometrie e.V., Bd. 30, 1979, s. 269-273 *

Also Published As

Publication number Publication date
EP0487018A1 (fr) 1992-05-27
DE9015855U1 (de) 1991-02-07
DE59106145D1 (de) 1995-09-07

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