Two-piece plastic fastener and apparatus for molding same

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Frangible member

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Details

411509, F16B 1304

Patent

active

045711348

ABSTRACT:
In a two-piece plastic fastener, initially molded as a unit, one piece is a grommet having a head with a flat front surface and forwardly projecting legs defining a sidewardly and forwardly opening slot; the other piece is a pin receivable through the head and forwardly slidable in the slot to an operative position holding the front ends of the legs flexingly diverged. As molded, a front end portion of the pin is connected with the head by a frangible flashing. A forwardly opening radially extending groove in the front of the head, opening from one side of the slot, defines a substantially flat forwardly facing groove surface that is rearwardly offset from and parallel to the front surface of the head and is flush with the front end surface of the pin. Cooperating ridges on the grommet legs and the pin confine the latter to lengthwise motion between the legs. In the molding apparatus, an elongated core element, lengthwise movable in mold-opening and mold-closing directions, defines the groove, the front end surface on the pin, and the rear portion of the slot.

REFERENCES:
patent: 2542144 (1951-02-01), Kearns
patent: 2941439 (1960-06-01), Rapata
patent: 3385158 (1968-05-01), Morin
patent: 3411397 (1968-11-01), Birmingham
patent: 3417438 (1968-12-01), Schuplin
patent: 3918130 (1975-11-01), Poe
patent: 4085651 (1978-04-01), Koscik
patent: 4276806 (1981-07-01), Morel
patent: 4405272 (1983-09-01), Wollar
patent: 4460298 (1984-07-01), Solarz et al.

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