Wheelchair

A folding wheelchair on which a wheelchair user can be seated, the wheelchair comprising:

• a left side frame that axially supports a drive wheel on a left side of a body;
• a right side frame that axially supports a drive wheel on a right side of the body;
• an upper support arm that couples the left side frame and the right side frame and is folded to the up direction in a central portion thereof in a left-right direction, the upper support arm including a first upper arm component that constitutes a left portion of the upper support arm, a second upper arm component that constitutes a right portion of the upper support arm, and an upper coupling member that rotatably couples a right end portion of the first upper arm component and a left end portion of the second upper arm component;
• a lower support arm that couples the left side frame and the right side frame, is folded to the down direction in a central portion thereof in the left-right direction, and is provided below the upper support arm, the lower support arm including a first lower arm component that constitutes a left portion of the lower support arm, a second lower arm component that constitutes a right portion of the lower support arm, and a lower coupling member that rotatably couples a right end portion of the first lower arm component and a left end portion of the second lower arm;
• an engaged section that is provided to the upper support arm and the lower support arm;
• an engagement section that engages the engaged section and thereby prevents relative displacement in the up-down direction of the central portions of the upper support arm and the lower support arm in the left-right direction;
• and
• an operation section for a switching operation of the engagement section from an engagement state with the engaged section to a disengagement state, the operation section including a lever-like member having an intermediate portion in the front-rear direction which is rotatably attached to the upper coupling member by an attachment shaft which extends in the left-right direction;
• wherein
• the engaged section includes a first pin that protrudes from the first upper arm component in a body front-rear direction, and a second pin that protrudes from the second upper arm component in the body front-rear direction;
• an engaged plate is disposed in front of the right end portion of the first lower arm component and the left end portion of the second lower arm component, and is rotatably attached to the right end portion of the first lower arm component and the left end portion of the second lower arm component, the engaged plate having a left protruding section and a right protruding section;
• the engagement section includes a left engagement member supported by a portion on the left side of a central portion in the left-right direction of the upper coupling member via a left rotary shaft, a right engagement member supported by a portion on the right side of a central portion in the left-right direction of the upper coupling member via a right rotary shaft, and an urging member that urges each of the left engagement member and the right engagement member to the engagement position;
• when the upper support arm and lower support arm are folded from the unfolded state, the left pin and the right pin engage with the left engagement member and the right engagement member in the folded state;
• when a front portion of the lever-like member of the operation section is lifted, the rear portion of the operation section moves downward and presses downward the left engagement member and the right engagement member, and the left protruding section and the right protruding section disengage from the left engagement member and the right engagement member;
• and
• when the upper support arm and lower support arm are unfolded from the folded state, the left protruding section and the right protruding section engage with the left engagement member and the right engagement member in the unfolded state.