Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Impact driven fastener – e.g. – nail – spike – tack – etc. – Of sheet metal
Patent
1988-02-29
1989-02-21
Eley, Timothy V.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Impact driven fastener, e.g., nail, spike, tack, etc.
Of sheet metal
24573, 411509, 411514, 411516, 411520, 174 164, 4034061, H05U 720
Patent
active
048060640
ABSTRACT:
Disclosed is a compensating roll pin securing a heat sink to a circuit board. The roll pin comprises a deformable body of resilient material, such as annealed spring steel, formed into a generally cylindrical body having first and second end portions separated by a middle portion of enlarged external diameter and an axially extending gap in the surface of the body. A method of use is also disclosed wherein the first end portion of the roll pin is inserted into an aperture in a heat sink and the middle portion deformed within the aperture to form a tight fit between the pin and heat sink. A substantial part of the middle portion remains outside the aperture in the heat sink. The second end portion is inserted into a hole in a circuit board and forms an interference fit therewith. The middle portion forms a stop to prevent further insertion of the roll pin into the circuit board so that a gap of predetermined distance separates the heat sink and circuit board to enhance cooling.
REFERENCES:
patent: 4301589 (1981-11-01), Fredriksson
Eley Timothy V.
Thermalloy Incorporated
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