Gravity return hinge having an axle rod in an axle sleeve
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United States of America Patent
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-
Jul 5, 1983
Grant Date -
N/A
app pub date -
Jun 3, 1981
filing date -
Jun 3, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An automatic return hinge having a primary and a secondary hinge, the primary hinge being furnished with an axle rod with spiral grooves, three locating balls in an axle sleeve roll along the spiral grooves on the axle rod as the door is opened and closed.
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