1981-05-28
1984-07-03
Butler, Douglas C.
Brakes
Rod
188 77W, 192 81R, 297375, B65H 5910
Patent
active
044574061
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.
REFERENCES:
patent: 2393242 (1946-01-01), Flogaus
patent: 2750994 (1956-06-01), Howell, Jr.
patent: 2890477 (1959-06-01), Miller
patent: 3249180 (1966-05-01), Torossian
patent: 3874480 (1975-04-01), Porter et al.
patent: 3998302 (1976-12-01), Schupner
patent: 4099777 (1978-07-01), Chekirda
patent: 4294339 (1981-10-01), Granger et al.
Butler Douglas C.
P. L. Porter Company
LandOfFree
Improved friction lock does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Improved friction lock, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Improved friction lock will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1626436