Metal working – Method of mechanical manufacture – Shaping mating parts for reassembly in different positions
Patent
1975-08-21
1976-08-10
DiPalma, Victor A.
Metal working
Method of mechanical manufacture
Shaping mating parts for reassembly in different positions
29229, 29235, B23P 1902
Patent
active
039733173
ABSTRACT:
This invention provides a removal arrangement for a fastener element which includes spaced exterior portions of a first diameter with a frustoconical portion in between, the frustoconical portion tapering from the first portion to a shoulder that connects to the third portion. A resilient retainer ring fits within a groove in a grommet attachable to a workpiece and encircles the fastener element at the first and third surface portions, and is engageable with the shoulder for preventing separation of the fastener element from the retainer ring. In the removal of the fastener element, an expansible member is extended over the fastener to encircle it at the third surface portion, the expansible member presenting an exterior surface substantially that of the first diameter of the fastener, bridging between the first and second surface portions so that said fastener element can be withdrawn from the retainer ring. The withdrawal, preferably, is accomplished by a punch having an extension of the same diameter as an opening in the fastener element, and a second portion of the first diameter, with a shoulder in between for engaging one end of the fastener element, and a backup member for engaging the grommet and the workpiece to which the grommet is attached, the backup member having an opening receiving the fastener element as it is withdrawn from the retainer ring.
REFERENCES:
patent: 3099876 (1963-08-01), Lawless
patent: 3214832 (1965-11-01), Schwinghamer
patent: 3393439 (1968-07-01), Shriver
patent: 3765465 (1973-10-01), Gulistan
patent: 3846887 (1974-11-01), Woods et al.
Deutsch Fastener Corporation
DiPalma Victor A.
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