Patent ID: 7845367

Claim:
A lock device for an operation pattern selecting valve in a working machine including: a plurality of hydraulic actuators for actuating a multi-joint front of the working machine and a swing device for swinging an upper swing structure; a plurality of hydraulically operated control valves for controlling said hydraulic actuators, and pilot valves for operating the control valves; tilt-type control levers installed on the left and right of an operator's seat and each serving as a control lever for the pilot valves, each of the tilt-type control lever being tilted forward, rearward, leftward and rightward; and an operation pattern selecting valve interposed in lines between operating hydraulic fluid chambers of each of the hydraulically operated control valves and the pilot valves for supplying pilot hydraulic fluid to the associated operating hydraulic fluid chambers, for selecting the hydraulic actuators actuated by each of the tilt-type control levers and/or selecting an operating direction of each of the hydraulic actuators for the operating direction of each of the tilt-type control levers, the operation pattern selecting valve being configured such that an end plate is attached to an end face of a cylindrical body in which a turn-type spool is housed and a turn-type control lever is attached to a shaft of the turn-type spool so as to project from the end plate in a radial direction of the shaft; the lock device comprising: a screw element screwed into a threaded hole formed in the end plate; a first bracket fixed to said screw element or formed integrally therewith, said first bracket being formed with a first lock hole; a second bracket having a fitting portion fitted to the turn-type control lever, said second bracket being formed with a second lock hole; and a lock; wherein the fitting portion of the second bracket is formed with an attachment hole through which a body shaft of said turn-type control lever is inserted axially, and the screw element is screwed into the threaded hole of the end plate adjacent said turn-type control lever to secure said first bracket to the end plate, the fitting portion of said second bracket is fitted to the turn-type control lever by inserting the body shaft of the turn-type control lever axially into said attachment hole formed in the fitting portion of the second bracket to connect said second bracket to the turn-type control lever, and said lock is insertably attached to the first and second lock holes of said first and second brackets for locking the turn-type control lever.