Fastener

Details Fastener Fastener

2011-03-01

2011-03-01

Estremsky, Gary (Department: 3677)

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Having structure to restrict rotation of threaded, mating...

Comprising a thread lock

C411S168000

Reexamination Certificate

active

07896597

ABSTRACT:
A fastener for fastening a heat sink to a printed circuit board via a back plate comprises a head and a shaft extending from the head. The shaft comprises a first and second engaging portions and a connecting portion therebetween. The first and second engaging portions have outer threads on exteriors thereof. Two cutouts are defined in the connecting portion. The back plate defines four thread holes machined with inner threads for engaging with the outer threads. In use of the fastener, an elastic force is produced to the fastener due to a deformation of the two cutouts during the threading. The elastic force helps the outer threads to have a secure engagement with the inner threads whereby the fastener can firmly engage with the back plate even when the fastener is subject to vibration or shock.

REFERENCES:
patent: 2035055 (1936-03-01), Dyer
patent: 2224659 (1940-12-01), Stoll
patent: 2427560 (1947-09-01), Johnson
patent: 2542377 (1951-02-01), Turkish
patent: 2555662 (1951-06-01), Schneider
patent: 2576438 (1951-11-01), Beach
patent: 2670022 (1954-02-01), Oldberg et al.

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