Transporter vehicle
US8731787B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 2011 |
| Grant date | May 20, 2014 |
| Priority date | — |
| Expiry date | Mar 30, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/0971
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A control valve device comprises two direction control valves. The direction control valve includes an expansion side variable throttle portion and a contraction side variable throttle portion. The direction control valve includes an expansion side variable throttle portion and a contraction side variable throttle portion. When a hoist cylinder is telescopically operated to raise or lower a vessel, as the hoist cylinder approaches a stop position, a controller determines that the hoist cylinder gets close to the stop position. Based upon this determination, the controller variably adjusts a flow passage area of the direction control valve using the variable throttle portions or variably adjusts a flow passage area of the direction control valve using the variable throttle portions in such a manner as to slow down or speed up the telescopic speed of the hoist cylinder corresponding to the weight in the side of vessel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.