Re-usable expandable plastic nut for two-piece fastener

Details Re-usable expandable plastic nut for two-piece fastener Re-usable expandable plastic nut for two-piece fastener

1987-02-09

1988-04-26

Wilson, Neill R.

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

Having separate expander means

Bulged by axially contracting ends

411 55, F16B 1304

Patent

active

047401230

ABSTRACT:
A two-piece fastener comprises a screw and a plastic nut for releasably securing together two apertured panels. The screw comprises a screw head and a threaded screw shank insertable in the aperture of one panel. The nut comprises a nut head, a nut shank insertable in the aperture of the other panel, and a bore extending through both the nut head and nut shank to receive the screw shank. The nut shank has an expandable portion, a screw-engaging portion, and a common wall therebetween. The bore has an unthreaded bore region through the nut head and through expandable nut shank portion, an intermediate bore region through the common wall and in a part of the screw-engaging nut shank portion, and a threaded bore region through the screw-engaging nut shank portion. The expandable nut shank portion comprises a plurality of thin, flexible, resilient walls, each connected between the common wall and the nut head. Each flexible wall has a parabolically shaped recess on its inner surface along which it can bend. Each adjacent pair of flexible wall is separated by a slit which extends axially from the common wall and through the nut head. A single thread on the wall of the intermediate bore region engages the screw thread to maintain the screw and nut in pre-assembled condition and to guide the screw thread into engagement with discrete screw-engaging thread sections formed in the threaded bore region.

REFERENCES:
patent: 3365999 (1968-01-01), Perlin
patent: 3385156 (1968-05-01), Polos
patent: 3404596 (1968-10-01), Ryder
patent: 4571136 (1986-02-01), Peek
patent: 4639175 (1987-01-01), Wollar
patent: 4674931 (1987-06-01), Schwind et al.

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