Hydraulically actuated coupler for industrial, agricultural, or earth-moving vehicle
US4850790A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1988 |
| Grant date | Jul 25, 1989 |
| Priority date | — |
| Expiry date | Jun 27, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/3663
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In an industrial, agricultural, or earth-moving vehicle, a charging pump, which delivers hydraulic fluid under pressure remaining substantially constant while the vehicle is operating and a coupler are combined. In the coupler, a hydraulically actuated piston-cylinder mechanism is used to wedge a pin into an orifice in an implement, thereby to couple the implement to the vehicle, and to withdraw the pin, thereby to uncouple the implement from the vehicle. A directional valve, which is connected between the pump and the piston-cylinder mechanism, is switchable by an operator of the vehicle between a first stage wherein the directional valve allows hydraulic fluid delivered by the pump to actuate the piston-cylinder mechanism in a forward direction, thereby to wedge the pin into the orifice, and a second stage wherein the directional valve allows hydraulic fluid delivered by the pump to actuate the piston-cylinder mechanism in a reverse direction, thereby to withdraw the pin. A normally closed, pilot actuated check valve, which is connected between the directional valve and the piston-cylinder mechanism, checks flow of hydraulic fluid from the piston-cylinder mechanism to the directi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.