Patent ID: 6898877
Filing Date: 2005-05-31
Classification: E02F

Abstract:
1. A method of setting a maximum angle of rotation of a boom of an excavating machine, the rotation of the boom produced by a hydraulic cylinder, the excavating machine having an encoder for digitizing an angular position of the boom, the encoder coupled to a hydraulic valve for controlling hydraulic pressure to the hydraulic cylinder, comprising the steps of: (a) pre-rotating the boom to the maximum angle of rotation; (b) digitizing the angular position of the boom when the boom is at the maximum angle of rotation in a direction; (c) rotating the boom to an angle less than the maximum angle of rotation; and (d) generating a signal on each occasion subsequent to step (a) that the boom rotates in the direction beyond the maximum desired angle of rotation, whereby the signal causes actuation of the hydraulic valve which prevents further rotation of the boom in the direction by the hydraulic cylinder.