Re-usable plastic drive rivets

Details Re-usable plastic drive rivets Re-usable plastic drive rivets

1988-02-18

1989-08-15

Gall, Lloyd A.

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

Having separate expander means

Frangible member

411 51, 411 72, F16B 1306

Patent

active

048569500

ABSTRACT:
A re-usable plastic drive rivet is of the type comprising an axially extending shank in association with an axially extending drive pin which is axially drivable into a bore extending axially through the shank. In order to permit release of the entire drive rivet by means of an unscrewing operation, without damaging the workpieces to which the drive rivet is secured, the outer surface of the shank has a thread formation thereon with the outer surface of the drive pin having a non-cylindrical outline complementary to a similar non-cylindrical peripheral outline of the interior wall of the bore. The non-cylindrical outlines can be substantially cylindrical apart from inter-engagable axial ribs and grooves. The shank can be integrally formed with the drive pin through means of frangible connections, but alternatively the shank can be preassembled with the drive pin by inserting the drive pin into the bore through the shank.

REFERENCES:
patent: 2159580 (1939-05-01), Zifferer
patent: 3196733 (1965-07-01), Cohen et al.
patent: 3417653 (1968-12-01), Staats et al.
patent: 3765295 (1973-10-01), Ptak
patent: 4233881 (1980-11-01), Carrier
patent: 4269246 (1981-05-01), Larson et al.
patent: 4642010 (1987-02-01), Bradley et al.
patent: 4648766 (1987-03-01), Wollar

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