Patent ID: 8515628

Claim:
A working machine comprising: a working arm; a hitch arrangement attached to the working arm and configured to be removably secured to a working implement; one or more sensors configured to determine an orientation of a working implement secured to the hitch arrangement and to output a signal indicative of the orientation of the working implement secured to the hitch arrangement with respect to gravity; a control module configured to receive the signal from the one or more sensors, the control module further configured to detect whether the hitch arrangement is in a permitted orientation or an unpermitted orientation, wherein the permitted orientation is a position where the working implement is less likely to fall from the hitch arrangement, and the unpermitted orientation is a position where the working implement is more likely to fall from the hitch arrangement, and the control module being further configured to perform a safety function in response to receipt of the signal such that the safety function is performed if the orientation of a working implement secured to the hitch arrangement with respect to gravity is an unpermitted orientation; and a user operable control coupled to the hitch arrangement and configured to actuate a closure of the hitch arrangement between an open position and a closed position, the closure being adapted to releasably secure the working implement to the hitch arrangement, wherein the safety function includes preventing the closure from moving from the closed position to the open position.