Adjustable, fusible, manually operable valve lock-open assembly
US5067510A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1991 |
| Grant date | Nov 26, 1991 |
| Priority date | — |
| Expiry date | Feb 11, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/1834
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An actuator shaft heat-sensitive locking apparatus is disclosed comprising a cylindrical housing having an axial bore. A shaft link is provided in the bore and is adjustable to contact gate valve actuator shafts of varying lengths. Once adjusted, the shaft link is movable axially between a first position and a second position, allowing the actuator shaft to close the gate valve. There is also provided a means movably extending through the housing for partially blocking the bore and a fusible element slidably mounted in the bore between the shaft link and the means for partially blocking the bore. The fusible element has both a solid state and a heat responsive state. In its solid state, the fusible elemnt prevents movement of the shaft link by enaging the bore blocking means; in its heat responsive state, the fusible element allows movement of the shaft link between the first position and second position. A mechanical release means is also provided surrounding the housing for axial movement in operative relation with the bore blocking means for remote operation. The mechanical release means allows the shaft link to move with the fusible element between the first position and the se…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.