Stop mechanism for worm gear set

Details Stop mechanism for worm gear set Stop mechanism for worm gear set

F - Mech Eng,Light,Heat,Weapons

16

H

251/20, 74/213

F16H 1/16 (2006.01) F16K 31/54 (2006.01)

Patent

CA 1126716

P-337 STOP MECHANISM FOR WORM GEAR SET ABSTRACT A worm gear set (12) particularly adapted for use as a valve actuator (10) includes a stop mechanism (14) having a blocking member (32) and a stop (34) that cooperate to terminate rotation of the worm (18) thereof in order to limit the extent of rotation of the gear (22) driven by the worm while preventing lockup due to excessive torque applied to the worm. An actuator (36) on the gear preferably moves the blocking member from a nonblocking position to a blocking position as the gear approaches an extreme of rotary movement whereupon the stop which is mounted on the worm is engaged by further worm rotation with the blocking member to terminate worm rotation and thereby limit the extent of gear rotation. A first adjuster of the stop mechanism controls the rotational position of the gear at which the actuator moves the blocking member into the blocking position, while a second adjuster of the stop mechanism is adjustable to control the rotational position of the worm at which the stop engages the blocking member upon movement thereof into the blocking position.

346070

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