Stop mechanism for worm gear set
US4220053A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1979 |
| Grant date | Sep 2, 1980 |
| Priority date | — |
| Expiry date | Mar 30, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/2063
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.