Door control device having piston assembly with separately forme

Details Door control device having piston assembly with separately forme Door control device having piston assembly with separately forme

1982-11-26

1985-03-05

Silverberg, Fred A.

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Checks and closers

Liquid

16 58, 16 62, 16 85, 16DIG9, 16DIG10, E05F 310

Patent

active

045021805

ABSTRACT:
The piston assembly of a hydraulically controlled door closer has a tubular wall, plugs secured in end portions of the wall and a separate rack secured inside the tubular wall between the plugs by formations on the plugs.

REFERENCES:
patent: 1123810 (1915-01-01), Shaw
patent: 1674756 (1928-06-01), Wuchert
patent: 1770250 (1930-07-01), Norton
patent: 3426383 (1969-02-01), Lasier et al.
patent: 3546734 (1970-12-01), Pollack et al.

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