Patent ID: 7828107
Filing Date: 2010-11-09
Classification: E02F,F16H,Y10T

Abstract:
1. A forward/reverse control system for a work machine, said system being provided with a front attachment control lever, a first forward/reverse control means and second forward/reverse control means for instructing forward, reverse or neutral of said work machine, a switching instruction means for instructing a switch from a first control state in which forward/reverse switching control is performed by said first forward/reverse control means to a second control state in which forward/reverse switching control is performed by said second forward/reverse control means, and a control means for controlling said work machine in accordance with an instruction by said first forward/reverse control means, an instruction by said second forward/reverse control means or an instruction by said switching control means, and said control means being set such that with an operation of said first forward/reverse control means, said second control state is cancelled to return to said first control state, wherein: said system is provided, in addition to said first forward/reverse control means, with a cancellation instructing means for instructing a cancel of said second control state, said second forward/reverse control means is disposed in the vicinity of but not on the front attachment control lever, said control means is set such that in accordance with an instruction of a cancel by said cancellation instructing means, said second control state is cancelled to return to said first control state, and wherein: said first forward/reverse control means comprises a control lever unit having a control lever that is shiftable to a forward position that instructs forward, a reverse position that instructs reverse, or a neutral position that instructs neutral and maintainable at said forward position, reverse position or neutral position; said second forward/reverse control means comprises a switch unit having a control member that is shiftable to a forward position that instructs forward, a reverse position that instructs reverse or a neutral position that instructs neutral and maintainable at said forward position, reverse position or neutral position, said switching instruction means comprises another switch unit comprising said cancellation instructing means and another control member that is shiftable to a switching state in which a switch from said first control state to said second control state is instructed or to a cancellation state in which a cancel of said second control state is instructed and is maintainable in said switching state or cancellation state; said control means is set such that, when neutral has been already instructed by both of said first forward/reverse control means and said second forward/reverse control means upon switching of said switching instruction means to said switching state, said first control state is switched to said second control state; and said switching instruction means is set such that, upon switching to said first control state by an operation of said first forward/reverse control means with said switching instruction means having been already switched to said switching state, any instruction by said switching instruction means is canceled until said switching instruction means is switched to said cancellation state.