Pneumatic door closer having resilient braking sleeve and cooper

Details Pneumatic door closer having resilient braking sleeve and cooper Pneumatic door closer having resilient braking sleeve and cooper

1983-08-08

1984-11-20

Silverberg, Fred A.

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

Checks and closers

Pneumatic

16 80, 16 86R, 16341, 16DIG17, 92 10, 92 85R, 92 85B, E05F 316

Patent

active

044830440

ABSTRACT:
Door speed is controlled by a pneumatic dashpot including a spring-loaded piston having a piston rod which extends through an elastomeric silicone rubber braking sleeve which is longitudinally compressed as the door opens to increase the friction between the piston rod and the sleeve. One or more enlargements on the piston rod provide increased friction as the rod moves through the braking sleeve to control closing speed and to provide greater wind resistance.

REFERENCES:
patent: 1818250 (1931-08-01), Harrah et al.
patent: 2212789 (1940-08-01), Newell
patent: 2224147 (1940-12-01), Ehlers
patent: 2569616 (1951-10-01), Mann
patent: 2650386 (1953-09-01), Edwards
patent: 2666944 (1954-01-01), Stehlin
patent: 2897534 (1959-08-01), Pickerell
patent: 2940552 (1960-06-01), Freyler

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