Door control device

Details Door control device Door control device

1989-03-30

1990-07-03

Seidel, Richard K.

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

Checks and closers

Liquid

10 58, 10 64, 10 79, E05F 314

Patent

active

049379143

ABSTRACT:
The piston of a door control device is assembled from a channel and cups welded on to opposite ends of the channel. A valve assembly is mounted in one of the cups. Rollers extend between opposite sides of the channel and co-operate with teeth on a rotatable member to which a control arm is secured.

REFERENCES:
patent: 409961 (1889-08-01), Goodenough
patent: 1309056 (1919-07-01), Angell
patent: 1359144 (1920-11-01), Angell
patent: 1833121 (1931-11-01), Norton
patent: 3845670 (1974-11-01), Grayson
patent: 4502180 (1985-03-01), Harrison et al.
patent: 4744125 (1988-05-01), Scheck et al.

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