| 摘要 |
638,976. Locking rods. HOUPLAIN, R. B. June 13, 1946, No. 17710. [Class 80 (iii)] An irreversible transmission mechanism between an operating lever 2 and an actuated shaft 1 comprises a cam member 3 secured for rotation with the shaft 1 but having a certain amount of radial play and spring-pressed jamming balls or rollers 6, 61 between cam slopes 5, 51 on the member 3 and a fixed ring 8. The lever 2 carries a finger 9 which projects between the balls 6, 61 to release any jamming action on operation of the lever in either direction to actuate the shaft 1. Reverse movement from the shaft 1 to the lever 2 is prevented by the balls jamming and thrusting the opposite surface of the cam member 3 against the surface of the ring 8 to provide a frictional resistance against movement as distinct from a purely jamming or wedging action of the balls. In a modified arrangement three pairs of wedging balls are provided adapted on reverse driving to act between the cam and a fixed drum mounted for a certain amount of resilient transverse movement to move the drum into frictional engagement with a flange on the driven shaft. In another modification three pairs of balls act on reverse driving movement to grip a ring member to expand a fixed circular spring into frictional engagement with a drum secured to the driven shaft. |
