Spring-return type actuator
US4702150A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 26, 1985 |
| Grant date | Oct 27, 1987 |
| Priority date | — |
| Expiry date | Nov 26, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T17/085
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A spring-return type actuator for valves including a piston cylinder mechanism, a movement conversion-transmission means disposed in the piston cylinder mechanism for converting reciprocation of a piston into a rotary motion of a valve drive shaft, a spring mechanism disposed in series relative to the piston cylinder mechanism, and a plurality of tie rods each including a male member having one end thereof attached to a flange portion of one side wall of the spring mechanism and having an external thread portion, and a female member having one end thereof screwed into a flange portion of the other side wall of the spring mechanism and having an internal thread portion helically meshed with the external thread portion of the male member and having a winglike member attached to the outer periphery thereof for engaging the female member with the outer periphery of the spring box to prevent the female member from rotating, and each tie rod having a length set larger than the free length of a spring when assumed immediately before the leading end of the external thread portion is released from its state kept in mesh with the internal thread portion so as to prevent the one side wall of …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.