US4602315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensating roll pin for heat sink mounting
Assignee: Aavid Thermalloy LLC
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Filing: 1984-08-24
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Granted: 1986-07-22
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Expires: 2004-08-24
Abstract
Abstract A compensating roll pin (10) is disclosed for use in securing a heat sink (12) to a circuit board (14). The roll pin (10) is formed by rolling a deformable material, such as annealed spring steel, into a generally cylindrical shape. The pin (10) has first and second end portions (22, 26) separated by a middle portion (24) of increased external diameter. The first end portion (22) can be inserted in the aperture (34) in the heat sink (12) and the middle portion (24) can be deformed within the aperture (34) to form a tight fit between the pin and heat sink. A substantial part of the middle portion (24) remains outside the aperture (34) in the heat sink. The second end portion (26) can be slidably inserted within the hole (38) in the circuit board (14) for an interference fit therebetween. The middle portion (24) forms a stop to prevent further insertion of the roll pin (10) within the circuit board (14) so that a gap of predetermined distance separates the heat sink and circuit board to enhance cooling.
Inventors
- 👤 Leonard S. Breese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:43
CPC Classifications
H; H10; H10W; H10W40/00; H10W40/60; H10W40/611; H10W40/20; H10W40/231
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
183 words
An apparatus for mounting an electrical component to a circuit board, comprising: a circuit board having at least one hole of a first predetermined diameter formed therein; a heat sink defining an aperture having a cross section of a second predetermined diameter; and a roll pin formed from a deformable material and having a generally cylindrical shape, the roll pin having a first end portion, a middle portion and a second end portion, the external diameter of the middle portion being greater than the external diameter of the first and second portions, the first end portion being located in the aperture in the heat sink, a portion of the middle portion being deformed and located in the aperture to provide a tight fit between the roll pin and the heat sink with a substantial portion of the middle portion external of the aperture, the second portion being located in the hole in the circuit board in an interference fit with the board, and with the middle portion contacting the circuit board and spacing the heat sink a predetermined distance from the circuit board.
Claim 2
Independent Claim
183 words
An apparatus for mounting an electrical component to a circuit board, comprising: a circuit board having at least one hole of a first predetermined diameter formed therein; a heat sink defining an aperture having a cross section of a second predetermined diameter; and a roll pin formed from a deformable material and having a generally cylindrical shape, the roll pin having a first end portion, a middle portion and a second end portion, the external diameter of the middle portion being greater than the external diameter of the first and second portions, the first end portion being located in the aperture in the heat sink, a portion of the middle portion being deformed and located in the aperture to provide a tight fit between the roll pin and the heat sink with a substantial portion of the middle portion external of the aperture, the second portion being located in the hole in the circuit board in an interference fit with the board, and with the middle portion contacting the circuit board and spacing the heat sink a predetermined distance from the circuit board.
Claim 3
Dependent Claim
13 words
The apparatus of claim 1 wherein said deformable material is annealed spring steel.
Claim 4
Dependent Claim
64 words
The apparatus of claim 1 wherein each of said first and second end portions defines a conical guide surface, the guide surface on the first end portion for assisting the insertion of the roll pin within the aperture in the heat sink, the guide surface of the second end portion for assisting insertion of the roll pin within the hole in the circuit board.
Claim 5
Dependent Claim
83 words
The apparatus of claim 1 wherein the roll pin further defines conical transition surfaces between the middle portion and each of the end portions, the transition surface between the first end portion and the middle portion assisting in the deformation of the middle portion as it is urged into the aperture and the transition surface between the middle portion and the second end portion acting as a stop to prevent the middle portion from being inserted within the hole in the circuit board.
Claim 6
Dependent Claim
28 words
The apparatus of claim 4 wherein the roll pin is coated with an electrically conductive material so that the heat sink and circuit board are in electrical communication.
Claim 7
Dependent Claim
27 words
The apparatus of claim 1, wherein said roll pin is formed with a gap between the facing edges of the material formed into the generally cylindrical shape.
Claim 8
Dependent Claim
29 words
The apparatus of claim 6, wherein the gap between the facing edges in the middle portion is larger than the gap between the facing edges in the end portions.
References Cited (Backward Citations)
US3688248A
Cited
US4076356A
Cited
US4097101A
Cited
US4403102A
Cited
US4321423A
Cited
US4526429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-21 | 1990-01-20 | 1990-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-21 | 1994-01-20 | 1994-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-21 | 1998-01-20 | 1998-07-22 | $7700.00 | Window Closed / Lapsed |