Screw and captive compression spring fastener assembly

Details Screw and captive compression spring fastener assembly Screw and captive compression spring fastener assembly

1978-02-10

1980-05-27

Zugel, Francis K.

Brushing, scrubbing, and general cleaning

F16B 3924

Patent

active

042045665

ABSTRACT:
There is disclosed a fastener assembly comprised of a screw fastener member having a driver head, a threaded shank portion and an unthreaded shank portion intermediate the threaded shank portion and the driver head. The unthreaded shank portion also includes a protruding portion defining an effective diameter greater than the major diameter of the threaded portion. This portion is formed by rolling a groove into the unthreaded shank portion in such a manner as to provide an annular projection having a tapered surface portion. There is further included a helical compression spring member having at least one end portion formed to an inner diameter larger than the major thread diameter, but smaller than the diameter of the protruding portion of the unthreaded shank portion. The compression spring is coaxially interfitted with the screw member with a selected one of the end portions axially advanced so as to be expanded and engaged over the protruding portion, thereby maintaining the spring member in captive relation at the unthreaded shank portion between the protruding portion and the driver head.

REFERENCES:
patent: 3437119 (1969-04-01), Dey
patent: 3505921 (1970-04-01), Wigam
patent: 3746067 (1973-07-01), Gulistan
patent: 3777796 (1973-12-01), Takano
patent: 3913649 (1975-10-01), Stanaitis
patent: 4064921 (1977-12-01), Kose

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