BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a working machine having a lever device and a working machine having the lever device.

Description of Related Art

As a working machine provided with a lever device such as an unload lever device, the working machine disclosed in Japanese Unexamined Patent Publication No. 2017-48522 is previously known.

Japanese Unexamined Patent Publication No. 2017-48522 discloses a technique for configuring a guide pin provided on the unload lever to engage with a guide groove provided on a support bracket under the state where the unload lever is pulled up (an unloading state), so that it is prevented from shifting to a loading state against the operator's intention when the operator pushes down a portion (the operation lever or the like) other than the unload lever.

SUMMARY OF THE INVENTION

A lever device according to one aspect of the present invention includes: a base pedestal; a movable body pivotally supported by the base pedestal to be rotatable about a first lateral shaft; a lever supported by the movable body to be swingable; a cam body having a cam groove, pivotally supported by the movable body to be rotatable about a second lateral shaft and configured to rotate about the second lateral shaft according to swinging of the lever; a guide pin provided on the base pedestal and inserted to the cam groove; and a first biasing member configured to press the cam body in a direction to rotate the cam body about the second lateral shaft. The cam groove includes: an intermediate groove portion curved to be convex in a direction separating from the first lateral shaft; an upper groove portion communicated with an upper end portion of the intermediate groove portion and curved in the direction separating from the first lateral shaft; and a lower groove portion communicated with a lower end portion of the intermediate groove portion and curved in the direction approaching the first lateral shaft. The lever is configured to swing between: a push-down position at which the guide pin is arranged in the upper groove portion; and a pull-up position at which the guide pin is arranged in the lower groove portion. The cam groove is provided in the cam body in front of the second lateral shaft. The first biasing member has: one end connected to a first connector portion provided on the base pedestal; and the other end connected to a second connector portion provided on the cam body, is arranged behind the second lateral shaft when the lever is located at the push-down position, and is arranged in front of the second lateral shaft when the lever is located at the pull-up position.

