Rotary switch valve
US4372341A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 28, 1980 |
| Grant date | Feb 8, 1983 |
| Priority date | — |
| Expiry date | May 28, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86863
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A rotary switch valve, particularly for use in a vehicle where the operator may wish to face in either direction such as on a tractor where implements or attachments may be mounted on either the front or rear ends. The valve consists of at least two passageways for allowing passage of hydraulic fluid, which passageways pass through both a casing and a spool, relative rotational movement being allowed between them. Upon 180.degree. relative rotational movement, the passageways feed fluid from the outlet ports in a sense opposite to that when the spool and casing were in their original positions. The steering system of the vehicle, therefore, will continue to direct the vehicle in its normal sense.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.