Low profile force indicating fastener, especially for semiconduc

Details Low profile force indicating fastener, especially for semiconduc Low profile force indicating fastener, especially for semiconduc

1977-11-25

1979-06-26

James, Andrew J.

357 81, 85 62, H01L 2342, H01L 2344, H01L 2346

Patent

active

041594835

ABSTRACT:
A low profile semiconductor clamp with force indicating means is disclosed. A resiliently compressive spring washer, such as a belleville, is incentrically disposed within and bowed above an annularly larger indicator washer. The washers rest on a base member to which a clamping force is to be applied by tightening a nut down on a threaded stud extending freely up through the base member and the washers. A load washer is disposed between the nut and the spring washer. In unclamped condition, the load washer rests on the spring washer and hence is spaced above the indicator washer, whereby the indicator washer may be freely manually rotated about the stud. Upon tightening the nut, the load washer compresses the spring washer until the load washer engages the indicator washer to impede manual rotation thereof due to its frictional binding between the load washer and the base member. Engagement of the indicator washer by the load washer corresponds to a certain vertical deflection of the spring washer which in turn corresponds to a certain loading force, whereby frictionally retarded rotation of the indicator washer affords an indication that the desired loading force has been attained.

REFERENCES:
patent: 2188356 (1940-01-01), Jeans
patent: 3323403 (1967-06-01), Waisman
patent: 3405597 (1968-10-01), Elsner et al.
patent: 3786168 (1974-01-01), Jaecklin et al.
patent: 3948141 (1976-04-01), Shinjo
patent: 4020734 (1977-05-01), Bell
patent: 4072081 (1978-02-01), Curtis et al.
Wakefield Semiconductor Heat Sink and Thermal Products Distributor Products Catalog, No. 102, p. 6; 8/1973.

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