Patent ID: 7426796
Filing Date: 2008-09-23
Classification: E02F

Abstract:
1. A control system for controlling the release of an accessory from a quick hitch coupler coupling the accessory to a hydraulically operable arm of a machine, the hydraulically operable arm being operable by a pressurized hydraulic system of the machine the coupler having: a body member adapted for coupling to the arm; an engagement mechanism, arranged on the body member, for releasably engaging the accessory, the engagement mechanism being actuatable to move the engagement mechanism between a first accessory engaged state in which the engagement mechanism engages the accessory securely for working of the accessory by the arm and a second accessory disengaged state in which the accessory is removable from the coupler; wherein the control system incorporates a safety control for preventing actuation of the engagement mechanism from the accessory engaged state to the accessory disengaged state if the hydraulic pressure in at least one selected part of the hydraulic system operating to move the coupler relative to the arm does not exceed a threshold value.