Patent ID: 8863640
Filing Date: 2014-10-21
Classification: E02F,F15B,Y10T

Abstract:
1. A control system for extending and retracting a ram of a hydraulic coupler for coupling an attachment to an arm of an excavator or back hoe, said control system including an indication device for providing an audible and/or visual alert to an operator, and an electrical circuit having a power supply for driving said indication device, a first switch comprising a pressure switch communicating with a ram extension line of a hydraulic circuit of the coupler, the first switch opening when the pressure in the ram extension line exceeds a predetermined pressure, and a second switch comprising a flow switch communicating with a feed line of the hydraulic circuit of the coupler, the second switch closing when there is fluid flowing within the feed line, the first and second switches being connected in parallel between the power supply and the indication device to control the supply of power to the indication device whereby the control system operates the indication device to provide an audible and/or visual signal to the operator in the event of a loss of hydraulic pressure as determined by the closing of the first switch and operates the indication device to provide an audible and/or visual signal to the operator in the event of the detection of hydraulic flow when there should be none as determined by the closing of the second switch output of the flow sensor and/or pressure sensor.