(under subclass 452) Device wherein the actuating transmission becomes frictionally held in position upon cessation of the actuating power, by the characteristics of the transmission proper.
(1) Note. Included in this subclass are patents to clamps with worm gearing or screw-and-nut drives (sometimes called "irreversible" drives), and drives comprising an actuating cam or wedge if of comparably high mechanical advantage.
(2) Note. A manually-operated wedge drive for a clamp would be classified here rather than in "manual actuation" if it is evident from the disclosure that it is intended to be self-binding.
SEE OR SEARCH THIS CLASS, SUBCLASS:
462, for a brake, latch or lock provided to hold a clamp in position.
