초록 ▼

A quick coupler for coupling an implement to a work machine is provided with a control system that substantially prevents inadvertent and unintended release of the implement from the machine. Inadvertent and unintended release of the implement is prevented by requiring two separate switches to be ac

A quick coupler for coupling an implement to a work machine is provided with a control system that substantially prevents inadvertent and unintended release of the implement from the machine. Inadvertent and unintended release of the implement is prevented by requiring two separate switches to be actuated to release the implement. Actuation of one switch supplies pressurized fluid to a fluid circuit connected to an actuator operable to release the implement from the machine. However, the pressurized fluid supplied in response to actuation of the one switch is not sufficient to activate the actuator. Concurrent actuation of a second switch raises the pressure of the fluid supplied to the actuator fluid circuit to a level sufficient to activate the actuator, thus releasing the implement.

대표청구항 ▼

[ What is claimed is:] [1.]1. A control system for a fluid actuator, comprising:a pressurized fluid source supplying fluid at a first pressure and, on demand, at a second pressure higher than said first pressure;an actuator fluid circuit connected between said source and said actuator;a first switch

[ What is claimed is:] [1.]1. A control system for a fluid actuator, comprising:a pressurized fluid source supplying fluid at a first pressure and, on demand, at a second pressure higher than said first pressure;an actuator fluid circuit connected between said source and said actuator;a first switch operable, when actuated, to selectively supply fluid from said source to said actuator circuit;a relief valve intermediate said source and said actuator, said relief valve permitting the flow of fluid to said actuator only if the fluid pressure is at least said second pressure; anda second switch operable, when actuated, to raise the fluid pressure supplied by said source from said first pressure to said second pressure;whereby pressurized fluid is supplied to said actuator only by concurrent actuation of said first and second switches.