Dual action control mechanism
US4065052A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 4, 1976 |
| Grant date | Dec 27, 1977 |
| Priority date | — |
| Expiry date | Nov 4, 1996 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B3/06
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A thermostatically operated dual action control mechanism for controlling fluid actuatable devices such as the shutter and the fan clutch in the cooling system of a diesel engine in vehicles. A valve rod is provided and movable between first and second positions. A hollow passageway is provided in the valve rod, and in one position of the valve rod is open to allow fluid to flow through to one of two exhaust ports in the valve housing to actuate one of the devices. In the other position, the passageway is closed off by a reciprocating needle valve. A thermally responsive sensor element actuates the valve rod between the first and second positions thereof. A limit switch is provided and actuated by the needle valve in the second position of the valve rod and opens up a solenoid valve to allow fluid to flow to the other device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.