Piston, method of making the piston and piston and cylinder unit

Details Piston, method of making the piston and piston and cylinder unit Piston, method of making the piston and piston and cylinder unit

1991-10-15

1992-12-29

Denion, Thomas E.

Expansible chamber devices

With assembly or disassembly facilitating means

92241, 92245, 92255, 2988804, 29888044, 72348, 72334, F01B 2900

Patent

active

051741920

ABSTRACT:
A piston for a door closer comprises metal cups on opposite ends of a stem. A plastics ring is a snap-fit in one of the cups and protrudes from that cup to seal against the wall of a cylinder. A groove in the side wall of the cup for receiving a rib on the ring is formed by pressing a substantially flat blank before the blank is formed into the cup.

REFERENCES:
patent: 1939683 (1933-12-01), Foehr
patent: 2129619 (1938-08-01), Longstreet
patent: 2305282 (1942-12-01), Taylor, Jr. et al.
patent: 4329916 (1982-05-01), Roeder

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