Double break-off screw

Details Double break-off screw Double break-off screw

1975-04-14

1976-02-10

Parsons, Jr., Marion

85 9R, F16B 3102

Patent

active

039371212

ABSTRACT:
A double break-off screw fastener is described, which conceals its mode of fastening by means of a "dummy" free-floating middle shaft. The inventive screw contains three sections, a threaded section which does the actual fastening; a middle shaft section which helps to internally fasten the threaded section before breaking-off; and an outer head section which breaks from the middle shaft, thus leaving the middle shaft in a free-floating state. To the outer observer, the middle shaft is free turning giving the impression of a fastening screw. In reality, however, it is nothing more than a dummy member, which carefully conceals the well hidden internal screw thread.

REFERENCES:
patent: 1970071 (1934-08-01), Bengtsson
patent: 3444775 (1969-05-01), Hills
patent: 3512447 (1970-05-01), Vaugan

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