Patent US4701702A successfully refreshed from Google Patents.
US4701702A
Expired / Lapsed
US
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Contact pin having a spring under tension
Assignee: Feinmetall GmbH
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Filing: 1987-01-16
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Granted: 1987-10-20
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Expires: 2007-01-16
Abstract
Abstract A spring-loaded contact pin for testing a plurality of closely spaced contacts of a test sample includes a casing in which a plunger is movably guided and under the influence of a spring in tension. In order to allow a simultaneous testing of these contacts, the casing as well as the plunger of the contact pins have an oblong cross section which means that the dimension in one direction is longer than the dimension in a direction normal to the one direction.
Inventors
- 👤 Gustav Kruger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:30
CPC Classifications
G; G01; G01R; G01R1/00; G01R1/02; G01R1/06; G01R1/067; G01R1/06711; G01R1/06716; G01R1/06722; H; H01; H01R; H01R11/00; H01R11/11; H01R11/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
184 words
A spring-loaded contact pin for contacting a test piece for its electrical operativeness, comprising: an elongated conductive casing of oval cross section, open at opposite ends and formed with a pair of generally planar sides joined by rounded edges such that, in cross section, said casing forms an oval having a longitudinal axis parallel to said sides and along which a major dimension of the oval cross section is at least twice a transverse dimension thereof as measured along a transverse axis perpendicular to said sides, said casing being of uniform cross section over its entire length; a conductive plunger slidable in said casing and of an oval cross section corresponding to that of said casing, said plunger having a pointed tip at one end projecting from one of said ends of said casing and being formed opposite at a shank of said plunger remote from said tip with a window elongated along a longitudinal axis of said plunger; and a tension spring received in said window and anchored to said casing and said plunger for resiliently urging said tip out of said casing.
Claim 2
Dependent Claim
184 words
A spring-loaded contact pin for contacting a test piece for its electrical operativeness, comprising: an elongated conductive casing of oval cross section, open at opposite ends and formed with a pair of generally planar sides joined by rounded edges such that, in cross section, said casing forms an oval having a longitudinal axis parallel to said sides and along which a major dimension of the oval cross section is at least twice a transverse dimension thereof as measured along a transverse axis perpendicular to said sides, said casing being of uniform cross section over its entire length; a conductive plunger slidable in said casing and of an oval cross section corresponding to that of said casing, said plunger having a pointed tip at one end projecting from one of said ends of said casing and being formed opposite at a shank of said plunger remote from said tip with a window elongated along a longitudinal axis of said plunger; and a tension spring received in said window and anchored to said casing and said plunger for resiliently urging said tip out of said casing.
Claim 3
Dependent Claim
15 words
The contact pin defined in claim 1 wherein said spring is welded to said plunger.
Claim 4
Dependent Claim
24 words
The contact pin defined in claim 1 wherein said plunger and said window project out of the other of said ends of said casing.
Claim 5
Dependent Claim
29 words
The contact pin defined in claim 1, further comprising an anchor pin spanning the walls of said casing and extending through said window, said spring engaging said anchor pin.
Claim 6
Dependent Claim
44 words
The contact pin defined in claim 1, further comprising stop means for retaining said plunger in a neutral position relative to said casing and from which said tip can be pressed into said casing and toward which said plunger is urged by said spring.
Claim 7
Dependent Claim
34 words
The contact pin defined in claim 5 wherein said casing has a tapered lower end section to provide said stop means, said plunger abutting against said tapered end section when in said neutral position.
Claim 8
Dependent Claim
27 words
The contact pin defined in claim 5 wherein said plunger has a projection adapted to abut said other end of said casing and forming said stop means.
Claim 9
Dependent Claim
38 words
The contact pin defined in claim 1 wherein said cross section of said casing has a length of 1 to 10 mm along said longitudinal axis and a width of 0.4 to 3 mm along said traverse axis.
Claim 10
Dependent Claim
26 words
The contact pin defined in claim 1 wherein said casing is made from a copper base alloy and said plunger is made of steel or copper-beryllium.
References Cited (Backward Citations)
US4321532A
Cited
DE3332187A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |