Clinch type fastener

Details Clinch type fastener Clinch type fastener

1974-10-29

1976-07-06

Britts, Ramon S.

Brushing, scrubbing, and general cleaning

29520, 151 4172, F16B 39282

Patent

active

039676692

ABSTRACT:
A self-clinching fastener and method of engagement thereof with an aperture section of sheeted material. The fastener includes a shank portion and an enlarged head, said shank portion having a tapered extruding section thereon of larger diameter than the aperture in said sheet material. The initial assembly steps resulting in said extruding section engaging and deforming a portion of the sheet material about said aperture to resize said aperture to a predetermined diameter, such that said shank will now be closely engaged with the aperture walls, and if desired the effective length of said aperture may be increased by the production of a rimmed hole. Accordingly, upon the further embedding of the fastener head into said sheet material, a portion of said material will be displaced radially inwardly to fill a relatively wide annular groove formed in said fastener shank thereby assuring a firm mechanical interlock. In addition, the fastener head may include a plurality of radially disposed projections which, when embedded in the sheet material, preclude relative rotation; and advantageously, the aforesaid radial projection may be provided with outwardly and downwardly tapering undersurfaces which tend to force displaced material radially inwardly and thereby assure complete filling of the locking groove.

REFERENCES:
patent: 1112525 (1914-10-01), Darling
patent: 1686468 (1928-10-01), Rosenberg
patent: 3137336 (1964-06-01), Wing
patent: 3221791 (1965-12-01), Rosan
patent: 3242962 (1966-03-01), Dupree
patent: 3367685 (1968-02-01), Church et al.
patent: 3399705 (1968-09-01), Breed et al.
patent: 3461936 (1969-08-01), Rosan et al.
patent: 3535678 (1970-10-01), Gulistan
patent: 3578367 (1971-05-01), Harvill
patent: 3782436 (1974-01-01), Steiner

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