Pneumatic door closer having resilient braking sleeve and cooperating piston rod incremental braking enlargements
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United States of America Patent
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-
Nov 20, 1984
Issued Date -
N/A
app pub date -
Aug 8, 1983
filing date -
Sep 27, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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