Fusible, resettable lock open device
US9982515B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 2015 |
| Grant date | May 29, 2018 |
| Priority date | — |
| Expiry date | May 12, 2036 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K35/04
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A locking apparatus for attaching to an end of a valve actuator includes an assembly body, the assembly body releasably securable to a valve actuator. The assembly body has a stem bore for receiving an actuator stem, and a plunger orifice through a sidewall of the assembly body. An immobilizer assembly has a plunger extending through the plunger orifice, and biased radially outward and moveable between a radially inner position where the immobilizer assembly extends over the stem bore, and a radially outer position where an inner end of the immobilizer assembly is radially outward of the stem bore. A segmented housing circumscribes the assembly body and is moveable between a first position where the plunger is in the radially outer position and a second position where the plunger is in the radially inner position. A fusible band selectively retains the segmented housing in engagement with the immobilizer assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.