Plastic drive fastener having tension-adjustment member

Details Plastic drive fastener having tension-adjustment member Plastic drive fastener having tension-adjustment member

1982-01-28

1984-09-11

Smith, Gary L.

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

Headed fastener element

Having resilient securing structure on shank

24453, F16B 1900

Patent

active

044707371

ABSTRACT:
The invention relates to a one-piece plastic fastener that has a shank, an enlarged head on a rear end of the shank, and resiliently movable bifurcations at the front end of the shank, the medial portion of the shank being wider than each of its ends to provide a shoulder and being flexingly contractable widthwise so that the fastener enters aligned holes in workpieces to be joined with a snap action. The shank is bifurcated along its length, and the forwardly opening slot between its bifurcations or legs is partially bridged by a tension-adjustment member, formed integrally with the bifurcations along one side thereof and extending inwardly from the side of the slot for a predetermined distance. The member controls or determine the amount of force required to move the legs or bifurcations toward each other during insertion into or removal of the fastener from the hole in the workpiece. Thus, fasteners of the same size and shape can be designed to fit workpiece holes of the same diameter but having different force requirements merely by changing the length of the tension-adjustment member during manufacture of the fastener and without otherwise changing the size or configuration of the fastener.

REFERENCES:
patent: 2909957 (1959-10-01), Rapata
patent: 3093027 (1963-06-01), Rapata
patent: 3413690 (1968-12-01), Pearson et al.
patent: 3485133 (1969-12-01), Rapata
patent: 3550217 (1970-12-01), Collyer
patent: 3722037 (1973-03-01), Jaeger
patent: 3803670 (1974-04-01), Johnson
patent: 3811154 (1974-05-01), Lindeman et al.
patent: 4122583 (1978-10-01), Grittner et al.

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