Automatic closure mechanism for double-acting doors
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United States of America Patent
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Aug 28, 1990
Issued Date -
N/A
app pub date -
Apr 9, 1985
filing date -
Mar 5, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved automatic door closure is provided for a door which has a door post mounted by two or more members attached to a door jamb. The door closure comprises a roller which is mounted on the door jam, a cam which is mounted on the door post so that it will rotate with the door post but is capable of limited movement relative to the post in an axial direction, and a spring for urging the cam against the roller as the door is swung between open and closed positions. The cam is contoured so as to cause it and the roller to coact with spring arranged to cause the door to return from open to closed position without any operator applied force. In a preferred embodiment of the invention, the door closure apparatus comprises a compression spring for urging the door to close, and an adjustable mechanism for varying the force exerted by that spring.
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