Patent ID: 7434637
Filing Date: 2008-10-14
Classification: B62D,Y10T

Abstract:
1. A working-machine steering apparatus comprising: left and right operating members; left and right clutches each operable, in response to operation of a corresponding one of said left and right operating members, to connect or disconnect, to or from a corresponding one of left and right drive shafts, rotational transmission from a drive source; and an assist mechanism, disposed between said left and right operating members and said left and right clutches, for assisting a force for operating any one of said left and right operating members when a corresponding one of said left and right clutches is to be brought into a disconnecting state, said assist mechanism comprising: first and second pulleys fitted over a rotation shaft of the drive source slippably relative to the rotation shaft; a first cord member wound on said first pulley in a U shape with pre-slack, said first cord member being engaged at one end by said left operating member and at another end by a member associated with said left clutch; and a second cord member wound on said second pulley in a U shape with pre-slack, said second cord member being engaged at one end by said right operating member and at another end by a member associated with said right clutch.