Patent US1260338A successfully refreshed from Google Patents.
Patent US3867003A successfully refreshed from Google Patents.
US3867003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semi-conductor clamping means
Assignee: Cableform Ltd
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Filing: 1973-05-30
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Granted: 1975-02-18
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Expires: 1993-05-30
Abstract
Abstract A clamping means for clamping a semi-conductor device between two heat sink clamping pieces, comprise a plurality of bolts holding the clamping pieces together through the intermediary of a plurality of disc spring washers and insulation pieces, the disc spring washers having a saturation characteristic such that above a certain deflection further deflection does little to increase the spring force.
Inventors
- 👤 John Morton
- 👤 Keith Drummond Stevens
- 👤 Graham Spencer Thexton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:15
CPC Classifications
H; H10; H10W; H10W40/00; H10W40/60; H10W40/611; H10W72/00; H10W40/625
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
190 words
An insulated heat sink clamp assembly for use with a semiconductor, comprising; a pair of opposed clamping pieces of an electrical and heat conducting material for engagement at opposite sides of the semi-conductor to be clamped therebetween; and force transmitting means positioned within the outer periphery of the clamping pieces for drawing the clamping pieces into intimate contact at opposite faces of the semi-conductor, said force transmitting means comprising a pair of bolt assemblies disposed in spaced relation within and extending transversely through the clamping pieces for flanking relation at opposite side edges of the semi-conductor, means on the bolt assemblies for exerting a predetermined pressure on the semiconductor, said bolt assemblies including electrical-insulating means thereon for insulating said assemblies from at least one of said clamping pieces, said clamping pieces forming electrical terminals for the semi-conductor to be clamped, said means for exerting a predetermined pressure including disc-spring washer means through which force is transmitted to the clamping pieces and the semi-conductor said spring-disc washer means having deflection saturation characteristics such that a predetermined force is imposed on said semiconductors by said clamping pieces when saturation deflection is reached.
Claim 2
Dependent Claim
190 words
An insulated heat sink clamp assembly for use with a semiconductor, comprising; a pair of opposed clamping pieces of an electrical and heat conducting material for engagement at opposite sides of the semi-conductor to be clamped therebetween; and force transmitting means positioned within the outer periphery of the clamping pieces for drawing the clamping pieces into intimate contact at opposite faces of the semi-conductor, said force transmitting means comprising a pair of bolt assemblies disposed in spaced relation within and extending transversely through the clamping pieces for flanking relation at opposite side edges of the semi-conductor, means on the bolt assemblies for exerting a predetermined pressure on the semiconductor, said bolt assemblies including electrical-insulating means thereon for insulating said assemblies from at least one of said clamping pieces, said clamping pieces forming electrical terminals for the semi-conductor to be clamped, said means for exerting a predetermined pressure including disc-spring washer means through which force is transmitted to the clamping pieces and the semi-conductor said spring-disc washer means having deflection saturation characteristics such that a predetermined force is imposed on said semiconductors by said clamping pieces when saturation deflection is reached.
Claim 3
Dependent Claim
44 words
The clamp assembly as claimed in claim 1 in which discspring washer means comprises an equal number of nested spring disc-washers on each bolt assembly, an innermost one of said spring-disc washers being in intimate electrical current-conducting realtion with one of said clamping pieces.
Claim 4
Dependent Claim
63 words
The clamp assembly as claimed in claim 1 in which said clamping pieces are elongated, plate-like elements, said bolt assemblies comprising both located adjacent outer end margins of the plate-like elements so that the bolts are relatively remote from the clamping area of the clamping pieces engagable with the semi-conductor whereby clamping force imposed upon the semiconductor is substantially equalized over the semi-conductor.
Claim 5
Dependent Claim
91 words
The clamp assembly as claimed in claim 3 in which said clamping pieces include opposed parallel faces having portions engagable at the opposite faces of the semi-conductor, each clamping piece having a pair of mutually parallel, transverse bores normal to the parallel faces, one of each of the bore portions of a clamping piece being co-axial to a bore portion of the other clamping piece, the electrical insulating means of the bolt assemblies including collar portions extending into a bore portion for orienting the bolt assemblies normal to the parallel faces.
Claim 6
Dependent Claim
73 words
The clamp assembly as claimed in claim 4 in which said bore portios include an enlarged counter-bore opening into the outer surface of the clamping pieces receiving the head of the bolt within the clamping piece, the bolt assemblies including pairs of nut elements, one nut element mounting the bolt on one clamping piece and the other nut element engaging the spring disc washer means and urging it against the other clamping piece.
Claim 7
Dependent Claim
88 words
The clamp assembly as claimed in claim 4 in which the bore portions of the clamping pieces in which the insulated collar portions engage is substantially larger in cross section than the bolt to space the bolt from the clamping piece bore portion and provide a substantial insulating air-gap therebetween, the bore portions of the other clamping piece being substantially complimentary to the cross section of the bolt assembly for assisting in maintaining the parallel relation of the opposed parallel faces of the clamping pieces engaging a semi-conductor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |