Valve actuator differential worm planetary gear drive
US4896562A · kind A · utility
10Cited by
3References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1988 |
| Grant date | Jan 30, 1990 |
| Priority date | — |
| Expiry date | Mar 24, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2025/209
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A valve actuator differential worm planetary gear drive provides forward or reverse motion to a valve stem, from an input from either a motor-driven worm or a handwheel driven worm, by using a plurality of planet gears to send motion to the sun gear. If the preference is to have the motor driven the valve primarily, the manual worm stays locked and the motor worm acts as a planetary arm. When it is desired to move the valve by hand, the motor gear is fixed and rotation of the handwheel worm gear transmits the power through the ring gear and the planet gears to the drive sleeve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.