Low power valve actuator
US5085401A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 1990 |
| Grant date | Feb 4, 1992 |
| Priority date | — |
| Expiry date | Jul 16, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/18648
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A low power valve actuator includes a small motor that rotates an Acme drive screw. The rotary motion of the drive screw is translated into linear motion of a drive nut-traveling block, which is guided along and held against rotation by a pair of spaced parallel guide rods. A cantilever pin carried on the traveling block engages in a groove extending longitudinally of, a Scotch yoke lever, which translates the linear motion back into rotary motion at a further mechanical advantage. The Scotch yoke lever is reinforced and strengthened by reason of the fact that the groove is not a through-slot, but extends only partially through the lever arm. The device is made more compact by reason of the fact that the groove in the Scotch yoke lever can actually extend over the top of the valve stem.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.