Body-weight-supported gait lift

1. A body-weight-supported gait lift, comprising:

a rail that is provided in a position above a head of a gait trainee and extends in a front-and-rear direction;

a travel base that is attached to the rail in a manner capable of being self-propelled;

a lifting device that is hung on the travel base and lifts the gait trainee to reduce a part of a body weight of the gait trainee loaded on legs of the gait trainee,

wherein the lifting device is hung in a manner relatively displaceable in the front-and-rear direction with respect to the travel base within a predetermined range; and

a control device that causes the travel base to be self-propelled forward when the gait trainee moves forward and the lifting device is relatively displaced forward with respect to the travel base within the predetermined range, and causes self-propelling of the travel base to stop when the travel base is self-propelled forward faster than the gait trainee moves and then the lifting device is relatively displaced rearward with respect to the travel base within the predetermined range, thereby causing the travel base to be self-propelled forward in accordance with a pace of the gait trainee,

wherein a hoisting device that hoists the lifting device is attached to the travel base,

wherein the travel base includes a shaft extending in the front-and-rear direction,

wherein an upper portion of lifting device is engaged with the shaft in a manner relatively displaceable in the front-and-rear direction and relatively non-displaceable in a circumferential direction so that the lifting device is hung on the travel base, and

wherein the hoisting device rotates the shaft to hoist the lifting device.

2. The body-weight-supported gait lift according to claim 1 , wherein the control device causes the travel base to be self-propelled rearward when the gait trainee moves rearward and the lifting device is relatively displaced rearward with respect to the travel base within the predetermined range, and causes self-propelling of the travel base to stop when the travel base is self-propelled rearward faster than the gait trainee moves and then the lifting device is relatively displaced forward with respect to the travel base within the predetermined range, thereby causing the travel base to be self-propelled rearward in accordance with the pace of the gait trainee.

3. The body-weight-supported gait lift according to claim 2 , wherein the control device includes:

a stop sensor that detects when the lifting device has reached a predetermined reference position with respect to the travel base;

a forward-movement sensor that detects when the lifting device has reached a forward position anterior to the predetermined reference position; and

a rearward-movement sensor that detects when the lifting device has reached a rearward position posterior to the predetermined reference position, and

wherein the travel base is self-propelled forward upon detection by the forward-movement sensor, the travel base is self-propelled rearward upon detection by the rearward-movement sensor, and self-propelling of the travel base is stopped upon detection by the stop sensor.

4. The body-weight-supported gait lift according to claim 2 , wherein the control device includes:

a forward-movement sensor that detects when the lifting device has reached a predetermined forward position with respect to the travel base; and

a rearward-movement sensor that detects when the lifting device has reached a rearward position posterior to the predetermined forward position,

wherein, in a predetermined forward-movement mode, the travel base is configured to be self-propelled forward upon detection by the forward-movement sensor and self-propelling of the travel base is stopped upon detection by the rearward-movement sensor, and

wherein, in a predetermined rearward-movement mode, the travel base is confirmed to be self-propelled rearward upon detection by the rearward-movement sensor and self-propelling of the travel base is stopped upon detection by the forward-movement sensor.

5. The body-weight-supported gait lift according to claim 1 , wherein the hosting device rotates the shaft in the circumferential direction to hoist the lifting device.

6. The body-weight-supported gait lift according to claim 1 , wherein the hoisting device includes:

a hoisting motor as a power source for hoisting the lifting device; and

a hoisting-force transmission mechanism that transmits a power of the hoisting motor to the shaft to rotate the shaft in the circumferential direction.

7. The body-weight-supported gait lift according to claim 6 , wherein the hoisting-force transmission mechanism includes:

a first pulley attached to a rear-end portion of the hoisting motor;

a second pulley attached to a rear-end portion of the shaft to rotate together with the shaft; and

a belt that is looped over the first pulley and the second pulley to transfer the power of the hoisting motor to the shaft.

8. The body-weight-supported gait lift according to claim 1 , further comprising:

a hoisting-device supporting protrusion that extends in a direction orthogonal to the longitudinal direction of an extension of the travel base.

9. The body-weight-supported gait lift according to claim 8 , wherein, below the travel base, the hoisting device is attached to the hoisting-device supporting protrusion.

10. The body-weight-supported gait lift according to claim 1 , wherein, on an outer peripheral surface of the shaft, rotation-preventing grooves are recessed and extend in the front-and-rear direction.

11. The body-weight-supported gait lift according to claim 10 , further comprising:

a reel attached to the shaft in the manner relatively displaceable in the front-and-rear direction and relatively non-displaceable in the circumferential direction,

wherein the rotation-preventing grooves are engaged with the reel for displacing the lifting device in the front-and-rear direction.