Fastener and captive frusto-conical washer assembly

Details Fastener and captive frusto-conical washer assembly Fastener and captive frusto-conical washer assembly

1977-09-29

1979-06-12

Frazier, Roy D.

Brushing, scrubbing, and general cleaning

85 50R, 339263R, F16B 3924

Patent

active

041577256

ABSTRACT:
There is disclosed a fastener assembly including a fastener or screw member having a head portion and an externally threaded body portion, and an improved novel washer design pre-assembled thereon and held in captive relation by the external thread form. The washer member comprises a frusto-conical body section which includes surfaces converging in a direction away from the fastener drive head, in contrast to the normal accepted practice of employing washer which surfaces converge toward the drive head. From this reversal of design numerous manufacturing and operational advantages result, most particularly when the washer includes a plurality of axially extending teeth disposed radially about the convex face thereof. When the assembly is engaged with a nut or a workpiece to clamp or join structural elements, the fastener head portion will bear directly over the teeth of the washer member urging them into biting engagement with the adjacent surface regardless of the degree of final assembly. Also, the reversed frusto-conical design permits the thread portion to be formed more closely to the head portion than could be attained with the prior art designs.

REFERENCES:
patent: 916421 (1909-03-01), Crittenden
patent: 1057686 (1913-04-01), Thomson et al.
patent: 2412120 (1946-12-01), Bouchard
patent: 2709470 (1955-05-01), Knohl
patent: 3777796 (1973-12-01), Takano
patent: 3960048 (1976-06-01), Wagner
patent: 3967875 (1976-07-01), Stanaitis

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