Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1984-08-24
1986-07-22
Tolin, G. P.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
165 803, 174 16HS, H05K 720
Patent
active
046023151
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.
REFERENCES:
patent: 3688248 (1972-08-01), Modrey
patent: 4076356 (1978-02-01), Tamburro
patent: 4097101 (1978-06-01), Holt
patent: 4321423 (1982-03-01), Johnson
patent: 4403102 (1983-09-01), Jordan
patent: 4526429 (1985-07-01), Kirkman
"Semiconductor Accessories," Thermalloy, Inc., pp. 9, 29 (1983).
Thermalloy Incorporated
Tolin G. P.
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