Wheelchair

1. A wheelchair comprising:

a main body;

a wheel rotatably provided in the main body;

a seat disposed on a top surface side of the main body;

a seat link mechanism by which the seat is supported to be movable up and down between a raised position and a lowered position on the top surface side of the main body;

a brake mechanism which inhibits the wheel from rotating in interlock with the seat link mechanism, when the seat is raised from the lowered position to the raised position;

a footrest provided on a front side of the main body, and

a leg link mechanism which drives the footrest in a vertical direction between a lifted-up position and a grounded position,

wherein the seat link mechanism is configured to move in interlock with the leg link mechanism to drive the seat from the lowered position to the raised position when the footrest is lowered in a grounded direction.

2. The wheelchair of claim 1 , wherein

the brake mechanism comprises an operation lever which is manually worked to compulsorily release a brake applied on the wheel in a state in which the brake is applied on the wheel while the seat is lowered.

3. The wheelchair of claim 1 , wherein

the footrest includes a bottom surface which entirely lands when the footrest is driven in a vertical direction by the leg link mechanism.

4. The wheelchair of claim 1 , wherein

the leg link mechanism is provided with a height adjustment mechanism configured to adjust a height of the footrest in a vertical direction.

5. The wheelchair of claim 3 , wherein

the bottom surface of the footrest comprises a non-slip means which contacts a floor when lands.

6. The wheelchair of claim 4 , wherein

the leg link mechanism comprises:

a first link, one end of which is pivotally attached to the front side of the main body;

a second link, one end of which is pivotally attached to a higher portion than the one end of the first link on the front side of the main body; and

a member constituting the height adjustment mechanism to which other ends of the first link and the second link are pivotally attached, and

the seat link mechanism comprises:

a fourth link, one end of which is coupled to the one end of the second link to move in interlock with rotating motion of the second link, and an other end of which is pivotally attached to a front end side of the seat; and

a fifth link, one end of which is pivotally attached further backward on a top surface of the main body than the fourth link, and an other end of which is pivotally attached to a back end side of the seat, the fifth link being configured to rotate with the fourth link and to raise the seat when the fourth link rotates in interlock with the second link of the leg link mechanism.

7. The wheelchair of claim 1 , wherein

the leg link mechanism is configured to lower the footrest from a lifted-up position to a grounded position while moving the footrest in a direction in which the footrest approaches a front of the main body, and

the seat link mechanism is configured to raise the seat while moving the seat toward the front of the main body.

8. The wheelchair of claim 1 , wherein the brake mechanism comprises:

a slide link comprising an engagement member at one end, the slide link being provided to be slidable along a back-and-forth direction of the main body;

a rotation link, one end of which is rotatably provided in the main body, and an other end of which engages with the engagement member provided at the one end of the slide link, the rotation link being configured to rotate in interlock with a sliding motion of the slide link;

a brake link, one end of which is rotatably provided in the main body, and an other end of which is provided with a brake member configured to press the wheel and inhibit the wheel from rotating;

a first interlock link, one end of which is integrally provided at the one end of the rotation link, which is a rotation fulcrum;

a second interlock link, one end of which is pivotally attached to an intermediate part of the brake link, and an other end of which is pivotally attached to an other end of the first interlock link, the second interlock link being configured to transmit rotating motion of the rotation link to the brake link via the first link; and

a transmission means configured to, when the seat is raised from the lowered position and the seat link mechanism is worked, transmit movement of the seat link mechanism to the brake link via the slide link, the rotation link, and the first and second interlock links, and press the brake member against the wheel by rotating the brake link.

9. The wheelchair of claim 1 , further comprising

An urging means configured to elastically urge the seat link mechanism in a direction in which the seat is raised.

10. The wheelchair of claim 9 , wherein

the urging means is configured to raise the seat by moving the seat link mechanism when a load on the seat is removed.