JP2012096857A - Winch device, and assist apparatus for getting on and off wheelchair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winch device that can eliminate looseness of a traction member in a simple structure, and to provide an assist apparatus for getting on and off a wheelchair, the apparatus including the winch device.SOLUTION: The winch device 1 includes: the traction member 2; a drum 3 that can wind and unwind the traction member 2; a motor 4 that can rotate the drum 3; a ratchet mechanism 5 that is provided between the drum 3 and the motor 4, connects the drum 3 to the motor 4, and is made to be engaged when the drum 3 is rotated in an unwinding direction D2 of the traction member 2 and to be disengaged when the drum 3 is rotated in a winding direction D1 of the traction member 2; and a rotary force biasing means 6 that biases the drum 3 in the winding direction D1 of the traction member 2.

Description

  The present invention relates to a winch device and a wheelchair entry / exit assistance device, and more particularly to a winch device capable of winding a traction member and a wheelchair entry / exit assistance device including the winch device.

  2. Description of the Related Art Conventionally, a winch device that can wind up a pulling member is used when, for example, a wheelchair gets on and off a vehicle. As a winch device used for getting on and off a wheelchair, a device for getting on and off the wheelchair from the rear of the vehicle via a slope has been proposed. In this winch device, a traction member (belt) provided on the drum of the winch device is attached to the wheelchair. By rotating the drum in this state, the wheelchair is loaded onto and unloaded from the vehicle via the slope by winding and unwinding the belt.

  As a device for getting on and off this type of wheelchair, a wheelchair lifting device is proposed in, for example, Japanese Patent Application Laid-Open No. 2009-213734.

JP 2009-213734 A

  In the wheelchair lifting device described in the above publication, when the wheelchair lifting device is used to move on the slope and lift the wheelchair into the vehicle, the assistant is at a speed higher than the winding speed of the belt of the wheelchair lifting device. If the wheel is pushed up, the wheelchair is pushed up before the belt is wound, so that the belt becomes slack. In this state, when the assistant relaxes the force to support the wheelchair, the wheelchair moves downward by the amount of slack of the belt, which places a burden on the wheelchair rider.

  Also, when the wheelchair lifting device is used to move on the slope and pull the wheelchair out of the vehicle, if the assistant holds the wheelchair or the wheelchair comes into contact with an obstacle, the belt of the wheelchair lifting device The speed at which the wheelchair actually descends is lower than the feeding speed, which also causes the belt to become slack. When the assistant releases the wheelchair in this state or the contact between the wheelchair and the obstacle is released, the wheelchair moves downward by the amount of slack in the belt. This will put a burden on the passenger.

  In order to eliminate the slack of the belt, for example, it is considered to detect an amount of winding of the belt and the amount of rotation of the drum, and to install an electric control mechanism that determines and controls the difference to eliminate the slack of the belt. It is done. However, when such an electrical control mechanism is attached, the configuration of the apparatus becomes complicated.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a winch device capable of eliminating the slack of the traction member with a simple configuration and a wheelchair entry / exit assistance device including the winch device.

  The winch device of the present invention is provided between a traction member, a drum capable of winding and unwinding the traction member, a motor capable of rotating the drum, and the drum and the motor. A ratchet mechanism that is engaged when the drum rotates in the feeding direction of the member and can be released when the drum rotates in the winding direction of the traction member; Rotational force urging means for urging in the direction.

  According to the winch device of the present invention, since the drum and the motor are connected by the ratchet mechanism, the rotation of the motor is selectively transmitted to the drum using the engaged state and the disengaged state of the ratchet mechanism. be able to. Here, since the rotational force urging means urges the drum in the winding direction of the traction member, the rotational force urging means causes the drum to move in the winding direction of the traction member with the ratchet mechanism disengaged. Can be rotated.

  Therefore, the traction member that is drawn from the drum by the rotation of the motor while the engagement of the ratchet mechanism is held can be wound around the drum by the rotational force biasing means while the engagement of the ratchet mechanism is released. . Therefore, when the slack is generated in the pulling member fed from the drum by the rotation of the motor, the slack of the pulling member can be eliminated.

  The winch device preferably further includes a power transmission mechanism that is interposed between the drum and the motor and transmits the driving force of the motor to the drum. The power transmission mechanism includes an outer ring and an inner ring connected to the outer ring. One of the outer ring and the inner ring is connected to the drum, and the other is connected to the motor. The ratchet mechanism includes a ratchet gear portion, a claw that can be engaged with and disengaged from the ratchet gear portion, and a claw urging member that urges the claw in the engagement direction with the ratchet gear portion. A ratchet gear portion is provided on one of the outer ring and the inner ring, and a claw and a claw urging member are provided on the other. The ratchet gear part and the claw engage with each other so that the driving force of the motor is transmitted to the ratchet gear part via the claw and the relative rotation of the ratchet gear part with respect to the claw in the feeding direction is suppressed. The engagement is released by the rotation of the traction member in the winding direction of the ratchet gear portion by the urging means.

  Thereby, since the driving force of the motor is transmitted to the drum by the outer ring and the inner ring, the apparatus can be miniaturized by arranging the inner ring inside the outer ring. Further, the ratchet mechanism includes a ratchet gear portion, a claw that can be engaged with and disengaged from the ratchet gear portion, and a claw urging member that urges the claw in the engagement direction with the ratchet gear portion. And the nail can be accurately engaged and disengaged. Further, the ratchet gear portion and the claw are engaged so that the relative rotation of the ratchet gear portion with respect to the claw in the feeding direction is suppressed, and the winding direction of the traction member of the ratchet gear portion by the rotational force biasing means Since the engagement is released by rotation, the drum can be accurately rotated in the winding direction of the traction member by the rotational force biasing means.

  Preferably, in the above winch device, the outer ring has an outer tooth row on the outer periphery, a recess for accommodating the claw on the inner periphery, a ratchet gear portion is provided on the outer periphery of the inner ring, and the driving force of the motor is external gear. When the inner ring is rotated relative to the outer ring by the rotational force biasing means, the engagement between the pawl and the ratchet gear portion is transmitted to the outer ring via the row and from the outer ring to the drum via the inner ring. The inner ring rotates so that the claw is received in the recess and the drum is rotated in the winding direction.

  Accordingly, the claw is accommodated in the recess of the outer ring, and the inner ring provided with the ratchet gear portion is rotated by the rotational force biasing means, so that the drum connected to the inner ring can be smoothly rotated in the winding direction. .

  The wheelchair boarding / alighting assistance apparatus of the present invention is a wheelchair boarding / alighting assistance apparatus for getting on and off a wheelchair, and includes a slope for raising and lowering the wheelchair relative to the vehicle and any one of the winch devices described above. When the wheelchair moves up and down the slope by the rotational drive of the motor of the winch device, the engagement of the ratchet mechanism is released by the rotation of the drum by the rotational force biasing means, and the slack of the traction member is wound around the drum.

  According to the wheelchair entry / exit assistance device of the present invention, when the wheelchair moves up and down the slope by the rotation drive of the motor of the winch device, the engagement of the ratchet mechanism is released by the rotation of the drum by the rotational force biasing means, Since the slack is wound around the drum, the slack of the pulling member can be eliminated. Therefore, it is possible to prevent the wheelchair passenger from being burdened by moving the wheelchair downward by the amount of the slack of the pulling member.

  As described above, according to the present invention, it is possible to provide a winch device capable of eliminating the slack of the traction member with a simple configuration and a wheelchair entry / exit assistance device including the winch device.

It is the schematic of the vehicle by which the wheelchair boarding / alighting assistance apparatus in one embodiment of this invention is arrange | positioned. It is a schematic fragmentary sectional view of the winch apparatus in one embodiment of the present invention. FIG. 3 is a schematic partial sectional view taken along line III-III in FIG. 2. FIG. 4 is a schematic partial sectional view taken along line IV-IV in FIG. 2. FIG. 5 is a schematic partial cross-sectional view taken along line VV in FIG. 4. It is a schematic fragmentary sectional view which shows the state by which the engagement of the ratchet mechanism was cancelled | released in the winch apparatus in one embodiment of this invention. It is the schematic which shows a mode that a wheelchair is boarded / alighted by the wheelchair boarding / alighting assistance apparatus in one embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this embodiment, as an example to which the present invention is applied, a case where the winch device gets on and off a wheelchair will be described.

  First, a state in which the wheelchair boarding / alighting assistance device according to one embodiment of the present invention is arranged in a vehicle will be described.

  Referring to FIG. 1, a vehicle (automobile) 30 includes a rear door 31 and a rear portion 32 that is opened and closed by the rear door 31. FIG. 1 shows a state in which the rear door 31 is opened and the rear portion 32 is opened outside the vehicle 30.

  The wheelchair boarding / alighting assistance device 100 is for getting on and off the wheelchair 20 on the vehicle 30. The wheelchair entry / exit assistance device 100 mainly includes two winch devices 1 and a slope 101. In the present embodiment, two winch devices 1 are provided in order to improve the left and right stability when the wheelchair 20 is moved on and off the vehicle 30, but the number of winch devices 1 may be one. Good.

  The two winch devices 1 are provided at the rear portion 32 at a distance from each other in the left-right direction of the wheelchair 20. The winch device 1 is disposed on the floor of the vehicle 30 in the rear portion 32, for example. The respective pulling members 2 are fed out from the two winch devices 1, and the respective hooks 2 a provided at the distal ends of the respective pulling members 2 are respectively locked to the left and right frames 21 of the wheelchair 20.

  The slope 101 is for raising and lowering the wheelchair 20 relative to the vehicle 30. The slope 101 is provided so as to be connected to the rear portion 32. The slope 101 is provided so as to incline downward toward the ground outside the vehicle 30. The wheelchair 20 is placed on the ground outside the vehicle 30 with the slope 101 interposed therebetween. The slope 101 may be composed of a plurality of plates. The slope 101 may be foldable. Moreover, the slope 101 may be configured to be electrically extendable and contractible.

  For example, the wheelchair 20 is raised on the slope 101 and pulled up to the rear portion 32 in the vehicle 30 by winding the respective pulling members 2 by the two winch devices 1 from the state shown in FIG. The wheelchair 20 is placed in a space where the rear seat (not shown) of the vehicle is folded and vacated in the rear portion 32, for example.

Next, the configuration of the winch device according to the embodiment of the present invention will be described.
2 to 5, the winch device 1 includes a traction member 2, a drum 3, a motor 4, a ratchet mechanism 5, a rotational force urging means 6, a power transmission mechanism 10, and a casing 50. The feed gear 51, the clutch 52, the drum lock ratchet gear 53, the intermediate gear 54, and the motor shaft gear 55 are mainly included. In FIG. 3, the pulling member 2 is not shown.

  Referring to FIGS. 2 and 3, traction member 2 is configured such that one end is connected to drum 3 and the other end opposite to the one end is connectable to a to-be-towed object. The pulling member 2 is provided so as to be wound around the drum 3. As the pulling member 2, for example, a belt, a rope, a wire, or the like that can pull the object to be pulled can be applied.

  The drum 3 is provided so that the pulling member 2 can be wound and fed out. The drum 3 has a cylindrical body portion. The drum 3 is configured such that the pulling member 2 can be wound around the body portion. The motor 4 is provided so that the drum 3 can rotate. The motor 4 is configured to rotate the drum 3 by the driving force of the motor.

  The power transmission mechanism 10 is interposed between the drum 3 and the motor 4 and is provided so as to transmit the driving force of the motor 4 to the drum 3. The power transmission mechanism 10 includes an outer ring 11 and an inner ring 12. The inner ring 12 is disposed on the inner peripheral side of the outer ring 11 and is connected to the outer ring 11. The outer ring 11 and the inner ring 12 are arranged so that the rotation axis is located coaxially with each other, but is not limited thereto, and is not arranged such that the rotation axis is located coaxially with each other via a gear or the like. May be.

  The outer ring 11 is connected to the motor 4 via a feed gear 51 and the like. The outer ring 11 may be directly connected to the motor 4 or may be indirectly connected through, for example, a gear. The inner ring 12 is connected to the drum 3. The inner ring 12 may be directly connected to the drum 3 or may be indirectly connected through a gear or the like, for example.

  In the above description, the outer ring 11 is connected to the motor 4 and the inner ring 12 is connected to the drum 3. However, the present invention is not limited to this, and the outer ring 11 is connected to the drum 3 and the inner ring 12 is connected to the motor 4. Also good. That is, one of the outer ring 11 and the inner ring 12 only needs to be connected to the drum 3 and the other connected to the motor 4.

  The ratchet mechanism 5 is provided between the drum 3 and the motor 4 and connects the drum 3 and the motor 4. The ratchet mechanism 5 may be directly connected to the drum 3 and the motor 4 or may be indirectly connected via the power transmission mechanism 10 or the like. The ratchet mechanism 5 is configured to allow rotation in one direction and limit rotation in the other direction on the opposite side. Specifically, the traction member 2 is configured to allow rotation in the winding direction D1 and limit rotation in the feeding direction D2.

  The ratchet mechanism 5 includes a ratchet gear portion 5a, a claw 5b, and a claw urging member 5c. The ratchet gear portion 5a, the claw 5b, and the claw urging member 5c are each provided in a number of three, but the number is not limited to this, and the number of each may be singular or plural. The teeth of the ratchet gear portion 5a are inclined toward the feeding direction D2. The claw 5b is provided so as to be detachable from the ratchet gear portion 5a. The claw 5b is formed so as to engage with the teeth of the ratchet gear portion 5a in the feeding direction D2. The claw urging member 5c is provided to urge the claw 5b in the direction of engagement with the ratchet gear portion 5a. For example, a spring or a spring can be applied to the claw urging member 5c.

  The ratchet gear portion 5 a is provided on the outer periphery of the inner ring 12. A concave portion 11 b for accommodating the claw 5 b is provided on the inner periphery of the outer ring 11. The claw 5b is provided on the outer ring 11 so as to be rotatable so as to enter and exit the recess 11b. The claw urging member 5 c is disposed between the inner periphery of the outer ring 11 and the claw 5 b and is provided on the outer ring 11 so as to urge the claw 5 b toward the inner ring 12.

  In the above, the outer ring 11 is provided with the claw 5b and the claw urging member 5c, and the inner ring 12 is provided with the ratchet gear portion 5a. However, the present invention is not limited to this, and the outer ring 11 is provided with the ratchet gear portion 5a. The inner ring 12 may be provided with a claw 5b and a claw urging member 5c. That is, the ratchet gear portion 5a may be provided on one of the outer ring 11 and the inner ring 12, and the claw 5b and the claw urging member 5c may be provided on the other.

  The rotational force urging means 6 is provided to urge the drum 3 in the winding direction D1 of the traction member 2. The rotational force biasing means 6 is connected to the drum 3 and the casing 50, and is configured to bias the drum 3 in the winding direction D1 by the biasing force. As the rotational force urging means 6, for example, a spring can be applied.

  The outer ring 11 has an outer tooth row 11a on the outer periphery. The outer ring 11 is provided such that the outer tooth row 11a meshes with the teeth of the feed gear 51 and is rotatable in the winding direction D1 and the feeding direction D2. By engaging the claw 5b provided on the outer ring 11 and the ratchet gear portion 5a provided on the inner ring 12, the inner ring 12 is provided to be rotatable in the winding direction D1 and the feeding direction D2.

  The ratchet gear portion 5a and the claw 5b transmit the driving force of the motor 4 to the ratchet gear portion 5a via the claw 5b, and the relative rotation of the ratchet gear portion 5a in the feeding direction D2 of the drum 3 is suppressed. The ratchet gear portion 5a is configured to be disengaged by the rotation of the ratchet gear portion 5a in the winding direction D1 of the pulling member 2.

  In the winch device 1 of the present embodiment, the driving force of the motor 4 is transmitted to the outer ring 11 via the outer tooth row 11 a, transmitted from the outer ring 11 to the drum 3 via the inner ring 12, and is applied by the rotational force biasing means 6. When the inner ring 12 rotates relative to the outer ring 11, the engagement between the claw 5b and the ratchet gear portion 5a is released, and the claw 5b is received in the recess 11b so that the drum 3 is rotated in the winding direction D1. The inner ring 12 is configured to rotate.

  Referring to FIGS. 4 and 5, feed gear 51 is connected to intermediate gear 54 via clutch 52. The intermediate gear 54 is connected to the motor shaft gear 55. The motor shaft gear 55 is connected to the rotating shaft of the motor 4. The casing 50 has an intermediate gear accommodating portion 50 a that accommodates the intermediate gear 54 and a motor accommodating portion 50 b that accommodates the motor 4.

  The motor 4 is configured to generate a driving force by rotating the rotation shaft. The motor 4 is supported by the casing 50 so that the rotating shaft can rotate. The motor shaft gear 55 is supported on the rotation shaft so as to be rotatable in the rotation direction of the rotation shaft of the motor 4. Teeth are provided on the outer periphery of the motor shaft gear 55. Teeth are provided on the outer periphery of the intermediate gear 54. The intermediate gear 54 is rotatably provided by meshing the teeth of the intermediate gear 54 with the teeth of the motor shaft gear 55. A clutch 52 is provided between the intermediate gear 54 and the feed gear 51. The rotation of the intermediate gear 54 is transmitted to the feed gear 51 by the clutch 52. Teeth are provided on the outer periphery of the feed gear 51. The feed gear 51 is rotatably provided by meshing the teeth of the feed gear 51 with the external tooth row 11 a of the outer ring 11.

  Thus, the winch device 1 of the present embodiment is configured such that the driving force of the motor 4 is transmitted to the outer ring 11 via the motor shaft gear 55, the intermediate gear 54, the clutch 52, and the feed gear 51. ing.

  Further, as shown in FIG. 3, a drum lock ratchet gear 53 is provided. The drum lock ratchet gear 53 is for locking the rotation of the drum 3. The drum lock ratchet gear 53 is connected to the drum 3. The drum lock ratchet gear 53 is provided to be engageable with a ratchet lever (not shown). When the drum lock ratchet gear 53 is engaged with a ratchet lever (not shown), the drum 3 is locked so as not to rotate in the feeding direction D2. Accordingly, the traction member 2 is held by the drum 3 so as not to be fed by locking the drum 3 so as not to rotate the drum 3 in the feeding direction D2.

  By providing the winch device 1 described above, the wheelchair boarding / alighting assisting device 100 according to the embodiment of the present invention moves the wheelchair 20 on and off the vehicle 30 by moving up and down on the slope 101 with the winch device 1 as shown in FIG. It is configured as follows. When the wheelchair 20 moves up and down the slope 101 by the rotation drive of the motor 4 of the winch device 1, the wheelchair entry / exit assistance device 100 is disengaged from the ratchet mechanism 5 by the rotation of the drum 3 by the rotational force biasing means 6. The slack of the pulling member 2 is configured to be wound around the drum 3.

Next, the operation of the winch device according to the embodiment of the present invention will be described.
First, the winding and feeding operation of the traction member 2 in a state where the ratchet mechanism 5 is engaged will be described. In the state where the ratchet mechanism 5 is engaged, the ratchet gear portion 5a and the claw 5b are engaged. Referring to FIGS. 2 and 3, the driving force of motor 4 is transmitted to outer ring 11. When the claw 5 b provided on the outer ring 11 and the ratchet gear portion 5 a provided on the inner ring 12 are engaged, the driving force of the motor 4 is transmitted from the outer ring 11 to the inner ring 12. The outer ring 11 and the inner ring 12 rotate together. As a result, the drum 3 connected to the inner ring 12 rotates in the winding direction D1 and the feeding direction D2.

  When the traction member 2 is wound, the outer ring 11 is rotated in the winding direction D1 by the driving force of the motor 4, so that the drum 3 connected to the inner ring 12 is rotated in the winding direction D1 and the traction member 2 is moved. It is wound up. On the other hand, when the pulling member 2 is extended, the outer ring 11 is rotated in the supply direction D2 by the driving force of the motor 4, whereby the drum 3 connected to the inner ring 12 is rotated in the supply direction D2 and the pulling member 2 is moved. It is paid out.

  Next, the winding operation of the pulling member 2 in a state where the engagement of the ratchet mechanism 5 is released will be described with reference to FIG. When the ratchet mechanism 5 is disengaged, the ratchet gear portion 5a and the claw 5b are disengaged. In a state where the ratchet mechanism 5 is disengaged, the claw 5b is housed in the recess 11b, and the ratchet gear portion 5a and the claw 5b are not engaged. Since the engagement between the ratchet gear portion 5a and the claw 5b is released, the driving force of the motor 4 is not transmitted from the outer ring 11 to the inner ring 12 even when the outer ring 11 is rotating. Therefore, since the driving force of the motor 4 is not transmitted to the drum 3 connected to the inner ring 12, the drum 3 is not rotated by the driving force of the motor 4.

  On the other hand, the drum 3 is urged by the rotational force urging means 6 in the winding direction D1. Therefore, in a state where the engagement between the ratchet gear portion 5a and the claw 5b is released, the drum 3 is rotated in the winding direction D1 by the urging force of the rotational force urging means 6. As a result, the pulling member 2 is wound around the drum 3. Since the rotational force biasing means 6 biases the drum 3 in the winding direction D1, the drum 3 rotates in the feeding direction D2 in a state where the engagement between the ratchet gear portion 5a and the claw 5b is released. That is limited.

  Next, with reference to FIG. 7, operation | movement of the wheelchair boarding / alighting assistance apparatus provided with the winch apparatus of one embodiment of this invention is demonstrated.

  First, the case where the wheelchair 20 is pulled up is demonstrated. This case corresponds to the case where the pulling member 2 is wound up. When the winch device 1 moves up on the slope 101 and pulls up the wheelchair 20 to the rear portion 32, the pulling member 2 is pulled downward by the weight of the wheelchair 20 and the rider 60. That is, tension is generated in the traction member 2 by the driving force of the motor 4 that rotates the drum 3 and the weight of the wheelchair 20 and the rider 60.

  Due to this tension, as shown in FIG. 2, the ratchet gear portion 5a and the claw 5b are engaged and engaged. Therefore, when the outer ring 11 rotates in the winding direction D1 by the driving force of the motor 4, the drum 3 connected to the inner ring 12 rotates in the winding direction D1 and the traction member 2 is wound up. In this state, the pulling member 2 is not slackened.

  On the other hand, when the assistant pushes up the wheelchair 20 at a speed faster than the winding speed of the traction member 2 while using the winch device 1, the wheelchair 20 is pushed up before the traction member 2 is wound up. The member 2 is slackened.

  Then, the case where the wheelchair 20 is pulled down is demonstrated. This case corresponds to the case where the pulling member 2 is extended. Even when the winch device 1 descends on the slope 101 and pulls down the wheelchair 20 from the rear portion 32, the pulling member 2 is pulled downward by the weight of the wheelchair 20 and the rider 60. That is, also in this case, tension is generated in the traction member 2 by the driving force of the motor 4 that rotates the drum 3 and the weights of the wheelchair 20 and the passenger 60.

  As shown in FIG. 2, the ratchet gear portion 5a and the claw 5b are engaged with each other by this tension. Therefore, when the outer ring 11 is rotated in the feeding direction D2 by the driving force of the motor 4, the drum 3 connected to the inner ring 12 is rotated in the feeding direction D2 and the traction member 2 is fed out. In this state, the pulling member 2 is not slackened.

  On the other hand, when the assistant holds the wheelchair 20 while using the winch device 1 or when the wheelchair 20 comes into contact with an obstacle, the wheelchair 20 actually descends below the feeding (feeding) speed of the traction member 2. Since the speed to perform is slower, the pulling member 2 is loosened.

  In both cases where the wheelchair 20 is pulled up and when the wheelchair 20 is pulled down, the traction member 2 may be slack as described above. In this case, the tension is not generated in the pulling member 2 due to the slack of the pulling member 2. In the state where this tension is not generated, no force is applied so that the ratchet gear portion 5a and the claw 5b maintain the engagement. It becomes larger than the force which acts so that nail | claw 5b may hold | maintain engagement.

  As a result, the engagement between the ratchet gear portion 5a and the claw 5b is released by the urging force of the rotational force urging means 6. Then, the rotational force biasing means 6 rotates the drum 3 so that the slack of the pulling member 2 is taken up. When the slack of the pulling member 2 is wound up, the ratchet gear portion 5a and the claw 5b are engaged again. As a result, the tension is generated again, so that the state in which the drum 3 is rotated by the rotational force urging means 6 ends.

  Therefore, the slack of the pulling member 2 is eliminated by winding the slack of the pulling member 2 with the rotational force biasing means 6. Thereby, it is suppressed that the pulling member 2 loosens and the wheelchair 20 moves below, and this places a burden on the passenger 60 of the wheelchair 20. Therefore, safety is improved. Usability is also improved.

Next, the function and effect of the embodiment of the present invention will be described.
According to the winch device 1 of one embodiment of the present invention, since the drum 3 and the motor 4 are connected by the ratchet mechanism 5, the motor using the engaged state and the disengaged state of the ratchet mechanism 5. 4 rotations can be selectively transmitted to the drum 3. Here, since the rotational force urging means 6 urges the drum 3 in the winding direction of the traction member 2, the rotational force urging means 6 pulls the drum 3 with the ratchet mechanism 5 disengaged. The member 2 can be rotated in the winding direction.

  Therefore, the pulling member 2 fed from the drum 3 by the rotation of the motor 4 while the engagement of the ratchet mechanism 5 is maintained is applied to the traction member 2 by the rotational force biasing means 6 while the engagement of the ratchet mechanism 5 is released. Can be rolled up. Therefore, when the traction member 2 fed from the drum 3 is slackened by the rotation of the motor 4, the sag of the traction member 2 can be eliminated.

  Further, according to the winch device 1 of the embodiment of the present invention, the outer ring 11 and the inner ring 12 transmit the driving force of the motor 4 to the drum 3, so that the inner ring 12 is arranged inside the outer ring 11. The device can be miniaturized. The ratchet mechanism 5 includes a ratchet gear portion 5a, a claw 5b that can be engaged with and disengaged from the ratchet gear portion 5a, and a claw urging member 5c that urges the claw 5b in the engagement direction with the ratchet gear portion 5a. Therefore, the ratchet gear portion 5a and the claw 5b can be accurately engaged and disengaged. Further, the ratchet gear portion 5a and the claw 5b are engaged so that the relative rotation of the ratchet gear portion 5a with respect to the claw 5b in the feeding direction D2 is suppressed, and the ratchet gear portion 5a by the rotational force biasing means 6 is engaged. Since the engagement is released by the rotation of the pulling member 2 in the winding direction D1, the drum 3 can be accurately rotated in the winding direction D1 of the pulling member 2 by the rotational force biasing means 6.

  Further, according to the winch device 1 of one embodiment of the present invention, the claw 5b is accommodated in the recess 11b of the outer ring 11, and the inner ring 12 provided with the ratchet gear portion 5a is rotated by the rotational force biasing means 6. Therefore, the drum 3 connected to the inner ring 12 can be smoothly rotated in the winding direction D1.

  According to the wheelchair entry / exit assistance device 100 according to the embodiment of the present invention, when the wheelchair 20 moves up and down the slope 101 by the rotation drive of the motor 4 of the winch device 1, the rotation of the drum 3 by the rotational force biasing means 6 is performed. Since the engagement of the ratchet mechanism 5 is released and the slack of the pulling member 2 is wound around the drum 3, the slack of the pulling member 2 can be eliminated. Therefore, it is possible to prevent a burden on the passenger 60 of the wheelchair 20 by moving the wheelchair downward by the amount of the slack of the pulling member 2.

  In addition, although the case where the winch apparatus was connected to the wheelchair was demonstrated above, it is not limited to this, The winch apparatus may be connected to the trolley | bogie etc. Moreover, although the above demonstrated the case where the wheelchair boarding / alighting assistance apparatus was arrange | positioned in the vehicle, it is not limited to this, The wheelchair boarding / alighting assistance apparatus may be arrange | positioned at the entrance of a building, etc. Moreover, the wheelchair boarding / alighting assistance device may be disposed in a nursing device or facility.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention can be applied particularly advantageously to a winch device capable of winding a traction member and a wheelchair entry / exit assistance device including the winch device.

  1 winch device, 2 pulling member, 2a hook, 3 drum, 4 motor, 5 ratchet mechanism, 5a ratchet gear, 5b claw, 5c claw biasing member, 6 rotational force biasing means, 10 power transmission mechanism, 11 outer ring, 11a External tooth row, 11b Recess, 12 Inner ring, 20 Wheelchair, 21 Frame, 30 Vehicle, 31 Rear door, 32 Rear, 50 Casing, 50a Intermediate gear housing, 50b Motor housing, 51 Feeding gear, 52 Clutch, 53 Drum Ratchet gear for locking, 54 intermediate gear, 55 motor shaft gear, 60 passenger, 100 wheelchair entry / exit assist device, 101 slope, D1 winding direction, D2 feeding direction.

Claims (4)

A traction member;
A drum capable of winding and unwinding the pulling member;
A motor capable of rotating the drum;
It is provided between the drum and the motor, connects the drum and the motor, becomes engaged when the drum rotates in the feeding direction of the traction member, and in the winding direction of the traction member. A ratchet mechanism that enables disengagement when the drum rotates;
A winch device, comprising: a rotational force biasing means for biasing the drum in the winding direction of the pulling member. A power transmission mechanism that is interposed between the drum and the motor and transmits a driving force of the motor to the drum;
The power transmission mechanism includes an outer ring and an inner ring connected to the outer ring,
One of the outer ring and the inner ring is connected to the drum, the other is connected to the motor,
The ratchet mechanism includes a ratchet gear portion, a claw that can be engaged with and disengaged from the ratchet gear portion, and a claw urging member that urges the claw in an engagement direction with the ratchet gear portion,
The ratchet gear portion is provided on one of the outer ring and the inner ring, and the claw and the claw urging member are provided on the other,
The ratchet gear part and the claw are
The driving force of the motor is transmitted to the ratchet gear portion through the claw, and is engaged so that relative rotation of the ratchet gear portion with respect to the claw in the feeding direction is suppressed,
2. The winch device according to claim 1, wherein the winch device is configured to be disengaged by rotation of the pulling member of the ratchet gear portion in the winding direction by the rotation force urging member. The outer ring has an external tooth row on the outer periphery, and has a recess for accommodating the claw on the inner periphery,
The ratchet gear portion is provided on the outer periphery of the inner ring,
The driving force of the motor is transmitted to the outer ring via the outer teeth row, and is transmitted from the outer ring to the drum via the inner ring,
When the inner ring rotates relative to the outer ring by the rotational force urging member,
The engagement between the claw and the ratchet gear portion is released, the claw is accommodated in the recess, and the inner ring is configured to rotate so as to rotate the drum in the winding direction. Item 3. The winch device according to Item 2. A wheelchair entry / exit assistance device for getting on and off a wheelchair,
A slope for raising and lowering the wheelchair relative to the vehicle;
A winch device according to any one of claims 1 to 3,
When the wheelchair moves up and down the slope by the rotational drive of the motor of the winch device, the engagement of the ratchet mechanism is released by the rotation of the drum by the rotational force biasing member, and the slack of the traction member is A wheelchair entry / exit assistance device configured to be wound on a drum.

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