Power plants – Pressure fluid source and motor – Having plural energy input means – pumps or diverse pump outlets
Reexamination Certificate
1999-02-15
2001-07-31
Look, Edward K. (Department: 3745)
Power plants
Pressure fluid source and motor
Having plural energy input means, pumps or diverse pump outlets
C091S165000, C091S420000
Reexamination Certificate
active
06266960
ABSTRACT:
TECHNICAL FIELD
This invention relates generally to a hydraulic control for a quick coupler and more particularly to a hydraulic control which provides a constant pressure on the head of a hydraulic actuator to maintain engagement of the quick coupler.
BACKGROUND ART
In the operation of constructions equipment in recent years there has been a growing trend to utilize machines originally intended for a rather specific task in much more varied applications. In order to accomplish this, hydraulic coupling mechanisms have been developed to allow a machine to mount and utilize more than one implement or tool. It is desirable to be able to quickly detach one tool and attach the next tool using a hydraulic control to latch the implement to the machine and unlatch the implement. While proper measures are available to prevent the unexpected uncoupling of the implement from the machine, there are certain conditions that may cause the connection to loosen slightly and permit the implement to move with respect to the machine during operation. This not only is aggravating to an operator, but it also accelerates the wear of the various components.
The present invention is directed to overcoming one or more of the problems set forth above.
DISCLOSURE OF THE INVENTION
In one aspect of the present invention, a hydraulic control is adapted for use with a coupling to attach an implement to a machine. The hydraulic control includes a hydraulic actuator having a head end and a rod end. The rod end includes a piston rod engageable with the implement to couple the implement to the machine. A first system of pressurized fluid is connected to the head end of the actuator for providing a constant fluid pressure to the head end for engaging and maintaining the piston in engagement with the implement. A second system of pressurized fluid selectively connected to the rod end of the hydraulic actuator for disengaging the piston rod from the implement.
It can therefor be seen that a hydraulic control for a coupling device of this type for an extremely quick transition between implement changes while maintaining a constant hydraulic fluid pressure on the head end of the actuator to latch the implement to the machine.
REFERENCES:
patent: 4790084 (1988-12-01), Anderson et al.
patent: 4850790 (1989-07-01), Johnson et al.
patent: 5015008 (1991-05-01), Schupback
patent: 5049027 (1991-09-01), Morrison et al.
patent: 5107610 (1992-04-01), Fusco
patent: 2265601 (1993-10-01), None
patent: 58-121304 (1983-07-01), None
Bibb John S.
Dvorak Paul A.
Green Tim A.
Hildner Peter R.
Swick W. Chris
Caterpillar S.A.R.L.
Glastetter Calvin E.
Lazo Thomas E.
Look Edward K.
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