Title: Arrangement for adjustably urging a semi-conductive element against a heat sink

Abstract: A flat surface of a planar power semiconductive element, such as a thyristor or diode, is adjustably urged downwardly against a heat sink in electrical and thermal contact therewith by means of a spring-loaded eccentric element. The spring extends transversely over the opposite surface of the semiconductive element between a pair of anchor members carried by the heat sink. The eccentric is secured to an intermediate portion of the transversely extending spring, and is adapted to rotate in a vertical plane whereby successive portions of the eccentric periphery are urged with different pressures downwardly against the opposed surface of the semiconductive element, either directly or through an insulating spacer element. If desired, a pair of flattened abutment areas may be established on diametrically opposed portions of the eccentric periphery to correspondingly define a two-position stable adjustment of the bearing pressure.

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Inventors: Kovar, Jiri (Prague, CS)
Kafunek, Pavel (Prague, CS)
Reichel, Pavel (Prague, CS)
Pokorny, Oldrich (Prague, CS)
Pellant, Michal (Prague, CS)
Kratina, Jindrich (Prague, CS)
Zuna, Jaroslav (Prague, CS)

Application Number: 745201
Filing Date: 1976-11-26
Publication_date: 1978-08-01
Assignee: CKD Praha, oborovy podnik (Prague, CS)
Primary Class(es): 257/718 165/80.2, 174/52.3, 257/E23.084
Other Classes:
US Patent Ref:

3226466	Dec, 1965	Martin	357/81.
3436603	Apr, 1969	Vogt	357/81.
3467897	Sep, 1969	Hoffmann et al.	357/81.
3624452	Nov, 1971	Hayward	357/81.
3688159	Aug, 1972	Robbins	357/81.
3715632	Feb, 1973	Warburton	357/81.
3743893	Jul, 1973	Yamomoto	357/81.
3808471	Apr, 1974	Grandia	357/81.

Other Refs: 439,034

Jan, 1975	SU

Primary Examiner: James, Andrew J.
Assistant Examiner:
Attorney: