Work machine

A work machine comprising:

• an operator seat;
• a work device having a hydraulic actuator;
• a support bracket disposed on a side of the operator seat;
• an operation box pivotally supported by a first lateral shaft disposed on the support bracket to be rotatable about the first lateral shaft, the operation box having an operation lever;
• an unload lever swingably supported by the operation box, the unload lever being configured to be swung to select whether or not to supply an operation fluid to the hydraulic actuator;
• a cam body pivotally supported by a second lateral shaft disposed on the operation box to be rotatable about the second lateral shaft, the cam body having a cam groove, the cam groove having a first side and a second side opposite to the first side in a lengthwise direction of the cam groove;
• a fourth guide pin to move in the cam groove in accordance with the swinging of the unload lever, the fourth guide pin being positioned on the first side of the cam groove when the unload lever is positioned to a pushed-down position and positioned on the second side of the cam groove when the unload lever is positioned to a pulled-up position;
• a pressing member to provide a biasing force with which the cam body is to be turned about the second lateral shaft;
• and
• a switch mechanism to switch a direction of the biasing force to a first direction where the cam body turns to a third direction when the fourth guide pin is at the first side of the cam groove and to a second direction where the cam turns to a fourth direction opposite to the third direction when the fourth guide pin is at the second side of the cam groove.

A work machine comprising:

• an operator seat;
• a work device having a hydraulic actuator;
• a support bracket disposed on a side of the operator seat;
• an operation box pivotally supported by a first lateral shaft to be rotatable about the first lateral shaft, the operation box having an operation lever;
• an unload lever swingably supported by the operation box, the unload lever being configured to be swung to select whether or not to supply an operation fluid to the hydraulic actuator;
• a cam body pivotally supported by a second lateral shaft disposed on the operation box to be rotatable about the second lateral shaft, the cam body having a cam groove, the cam groove having a first side and a second side opposite to the first side in a lengthwise direction of the cam groove;
• and
• a sixth guide pin to moves in the cam groove in accordance with the swinging of the unload lever, the sixth guide pin being positioned on the first side of the cam groove when the unload lever is positioned to a pushed-down position and positioned on the second side of the cam groove when the unload lever is positioned to a pulled-up position, the unload lever comprising a lock portion to lock the sixth guide pin when the sixth guide pin is at the second side of the gam groove.