Improved friction lock
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jul 3, 1984
Issued Date -
N/A
app pub date -
May 28, 1981
filing date -
Jun 6, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A mechanical lock normally preventing axial motion of a rod with respect to a housing includes a coil spring which normally encircles and grips the rod tightly. The coil spring is mounted on the rod between a fixed bushing and a rotatable bushing. The two bushings are identical and interchangeable to reduce the cost and complexity of the device. The rotatable bushing is rotated by an actuating lever to unwind the spring so as to increase its diameter and thereby to release its grip on the rod. Both the fixed bushing and the rotatable bushing include beveled faces which permit the last few turns at both ends of the spring to become cocked on the rod to provide a true locking engagement with the rod. The last few turns of the spring adjacent the rotatable bushing are immediately released by a minimum of rotation of the bushing since it is not necessary for the unwinding of the spring to be transmitted through the entire length of the spring.
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