Oil hydraulic circuit for gripping device
US4502723A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 23, 1983 |
| Grant date | Mar 5, 1985 |
| Priority date | — |
| Expiry date | Jun 23, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/4135
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A gripping device includes a plurality of articulate gripping fingers coupled to a support structure turnable with respect to a neck structure. The articulate fingers respectively have first and second segments pivotally movable by oil hydraulic cylinders. Oil hydraulic pressure is applied to the oil hydraulic cylinders from an oil hydraulic pump. A pilot relief valve which can provide a variable relief pressure according to a pilot pressure, is provided on the discharge line leading from the oil hydraulic pump, and can be connected to a directional control valve to an oil hydraulic cylinder, which can provide a variable pilot pressure according to the extent of depression of a clamping force setting pedal provided in an operator's room.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.