PROBLEM TO BE SOLVED: To provide a work machine capable of performing stable assisting action.SOLUTION: An assist mechanism which applies a force in a direction of flipping up an apron is disclosed, including a first tubular member and a second tubular member movable on the same axis. A second support point and one end of a gas spring are connected to the first tubular member. The other end of the gas spring is connected to the second tubular member. A first projection part provided at the second tubular member comes in contact with a second projection part whose rotational center is a third support point, for changes in a direction decreasing a distance between the third support point and the second support point, and thereby, a force required for flipping up an apron gradually decreases within a range of a specified angle in which an apron angle increases. The gas spring is configured to contract at a point where the apron falls.SELECTED DRAWING: Figure 5【課題】安定したアシスト動作が可能な作業機を提供すること。【解決手段】同一軸上で移動可能な第１の筒状部材と第２の筒状部材とを有し、第１の筒状部材には第２の支点とガススプリングの一端とが接続され、第２の筒状部材にはガススプリングの他端が接続され、第２の筒状部材に設けられた第１の突部が第３の支点を回動中心とする第２の突部に接触して第３の支点と第２の支点との距離を縮める方向に変化することにより、エプロンを跳ね上げるのに要する力は、エプロン角度が増加する所定角度範囲内において徐々に減少し、ガススプリングは、エプロンが下降した地点において収縮するように構成されるエプロンを跳ね上げる方向に力を作用させるアシスト機構を開示する。【選択図】図５
