JP2018191755A - Wheelchair lifting/lowering mechanism and wheelchair mounted with the same - Google Patents

Abstract

To provide a wheelchair lifting/lowering mechanism capable of lifting and lowering a wheelchair body to a floor surface and the ground, and provide a wheelchair where the wheelchair lifting/lowering mechanism is included, a backrest part can be tilted rearward to a seating surface, and a wheelchair body can be folded in the left and right central part when not in use.SOLUTION: A wheelchair lifting/lowering mechanism is capable of lifting and lowering a wheelchair to a floor surface, and is mounted in a wheelchair. The wheelchair lifting/lowering mechanism includes 4-places of lifting/lowering mechanisms vertically-installed in each of left and right front-rear edge vicinity of a seat surface part of the wheelchair, 1-place of drive unit for generating the turning force, and a turning force transmission unit for transmitting the turning force of the drive unit to the 4-places of lifting/lowering mechanisms. The lifting/lowering mechanism includes a screw rod capable of moving freely vertically while turning, and a screw rod-driving gear arranged coaxially with the screw rod, regulated in the vertical direction movement, and having an internal tooth screwed with the screw rod and an outer tooth screwed with the gear of the turning force transmission unit. The wheelchair lifting/lowering mechanism and the wheelchair with backrest inclination means can solve the problem.SELECTED DRAWING: Figure 16

Description

  The present invention includes a wheelchair lifting mechanism that can lift and lower a wheelchair body with respect to a floor surface and the ground, and the wheelchair lifting mechanism, and the backrest portion can be tilted with respect to a seating surface. It is related with the wheelchair which can be folded in a part.

  In Patent Document 1, an oil tank, a pump, and a pressure handle are arranged on one side of the wheelchair, a hydraulic cylinder is arranged on the left and right, a hydraulic pipe is arranged between the left and right, and the seat portion is moved up and down. A folding wheelchair is disclosed.

  In Patent Document 2, an elevating unit such as a gas cylinder or an electric actuator is disposed below the seat surface portion in the center portion in the left-right direction, and an X-shaped link capable of folding the machine frame supporting the seat surface portion in the left-right direction is provided. A wheelchair is disclosed.

JP 2013-34595 A JP 2008-259757 A

  In the invention of Patent Document 1, since an oil tank and a pump are arranged on one side and a hydraulic cylinder is arranged on both sides as an elevating mechanism, the overall weight becomes heavy and the left and right weight balance becomes heavy on one side and is difficult to handle. was there. In addition, since the backrest portion is not structured to be able to tilt backward, there is a problem that it is not easy to move the cared person to an automobile seat or the like by tilting the backrest portion backward.

  The invention of Patent Document 2 has a problem that the lifting unit such as a gas cylinder or an electric actuator is disposed below the seat surface portion in the center portion in the left-right direction as the lifting mechanism, so that it becomes heavy overall and difficult to handle. In addition, since the backrest portion is not structured to be able to tilt backward, there is a problem that it is not easy to move the cared person to an automobile seat or the like by tilting the backrest portion backward.

  The present invention was devised in view of such problems, and includes a wheelchair lifting mechanism that can lift and lower a wheelchair body with respect to the floor surface and the ground, and the wheelchair lifting mechanism, and the backrest portion is inclined backward with respect to the seating surface. An object of the present invention is to provide a wheelchair that can be folded at the left and right center when it is not in use.

  The wheelchair elevating mechanism according to claim 1 is a wheelchair elevating mechanism mounted on the wheelchair that allows the wheelchair to elevate, and the wheelchair elevating mechanism stands in the vicinity of the left and right front and rear ends of the seat surface portion of the wheelchair. Provided with four raising / lowering mechanisms provided, a driving part for generating a turning power, and a turning power transmission part for transmitting the turning power of the driving part to the lifting mechanism, and the lifting mechanism is rotated. A screw rod body that can move freely in the vertical direction, an inner tooth that is coaxially arranged with the screw rod body and that is restricted from moving in the vertical direction, and that engages with the screw rod body, and the rotational power transmission portion A screw for driving a rod body having external teeth to be engaged with the gear of the wheel, and when the screw rod body moves downward, the lower end of the screw rod body lands on the floor surface and the wheelchair. The floor is separated from the floor surface, and when the screw rod body moves upward, the lower end of the screw rod body is the floor surface. Et spaced apart from and wherein the to landing the wheelchair to the floor.

  A wheelchair lifting mechanism according to a second aspect of the present invention is the wheelchair lifting mechanism according to the first aspect, wherein the rotating power transmission portion is a left-right direction transmission shaft that transmits a vertical rotation in the left-right direction disposed on the front side or rear side of the wheelchair. A first form of a substantially U-shape in a plan view, provided with a longitudinal transmission shaft that transmits the vertical rotation disposed in the left and right sides of the wheelchair in the front-rear direction, or the left and right sides of the wheelchair Each of the first and second configurations has a second configuration in which two front-rear transmission shafts are arranged in parallel in a plan view. The elevating mechanism is disposed at all four positions of the front and rear end portions of the front-rear direction transmission shaft, and both end portions of the front-rear direction transmission shaft and the elevating mechanism are connected by a lifting force transmission gear mechanism. And

  The wheelchair lifting mechanism according to claim 3 is the bending according to claim 2, wherein the wheelchair lifting mechanism can be bent at approximately three positions of the both ends and the substantially central portion of the left-right direction transmission shaft in the first embodiment and can transmit rotational power. A rotation connecting means is provided.

  According to a fourth aspect of the present invention, in the wheelchair lifting mechanism according to any one of the first to third aspects, the drive unit is in a manual form by hand or an electric form by a motor.

  The wheelchair lifting mechanism according to a fifth aspect of the present invention is the wheelchair lifting mechanism according to any one of the first to fourth aspects, wherein the screw rod body of the lifting mechanism reaches an ascending end or a descending end when the drive unit is an electric form using a motor. And a control unit that controls the motor drive unit and the detection unit. The control unit starts operating the motor of the drive unit, and the rising end from the detection unit is provided. Alternatively, the motor is stopped by detecting the arrival at the descending end.

  The wheelchair according to claim 6 is equipped with the wheelchair lifting mechanism according to any one of claims 1 to 5.

  A wheelchair according to a seventh aspect is the wheelchair according to the sixth aspect, in which the backrest frame is moved backward from a substantially vertical posture with the backrest portion of the wheelchair as the center of rotation of the left and right lower ends of the backrest frame constituting the backrest portion. It is characterized by comprising tilting means that can be rotated to give any posture from a horizontal state to a posture tilted further downward.

  The wheelchair according to claim 8 is the wheelchair according to claim 6 or 7, wherein the backrest frame is part of the left and right parts of the substantially U-shaped frame that is the upper part in the pipe-like left and right frames that are the lower part. The length of the backrest frame in the longitudinal direction can be adjusted by inserting and sliding the U-shaped frame.

  Since the wheelchair lifting mechanism according to any one of claims 1 to 5 lifts not only the seat surface portion of the wheelchair but also the entire wheelchair, the backrest portion is inclined backward as compared with the case where only the seat surface portion is lifted. When this happens, there is no step between the seat frame and back frame, and there is no difference between the seat on the seat frame and the back seat on the back frame. Therefore, since the weight of the cared person is added to the backrest frame and the seat frame, the cared person can easily transfer, and there is an effect that the backrest seat or the like is not damaged.

  And it has the effect that it can attach to the wheelchair currently distribute | circulated on the market including the wheelchair in use by additional construction.

  In addition, the form of the rotational power transmission portion is a vertical transmission shaft disposed on the left or right side of the wheelchair and a left-right transmission shaft that transmits the vertical rotation disposed on the front or rear side of the wheelchair in the left-right direction. In the case of the first form having a front-rear direction transmission shaft for transmitting the rotation in the front-rear direction and having a substantially U-shape in plan view, the gear and the rotation shaft are used as the means for transmitting the rotational force. It is possible to synchronize the raising and lowering of the raising and lowering mechanisms by the mechanism of the rotating power transmission unit. In addition, when the form of the rotational power transmission part is the second form, the raising / lowering of the four raising / lowering mechanisms is synchronized by deciding the position of the ascending end or descending end with the detector and matching the start of operation with the control part. It can be made.

  Since the wheelchair lifting mechanism according to claim 3 can bend the right-and-left direction transmission shaft, the wheelchair lifting mechanism can be used when the wheelchair is not in use, such as during wheelchair storage, even if the power transmission section is in the first form. You can fold a wheelchair equipped with In the case where the rotating power transmission portion is in the second form, there is no obstacle in the left-right direction, so the wheelchair can be folded when not in use, such as during storage.

  In the wheelchair lifting mechanism according to the fourth aspect, the lifting mechanism can be lifted manually or electrically.

  Since the wheelchair according to claim 5 can be controlled to stop the operation of the drive unit 4 by detecting that the lift unit has reached the rising or falling end after the operation of the lifting mechanism is started, the driving unit is electrically operated. In the case of the embodiment, if the operator presses the start button for starting up / down, it can be automatically stopped at a predetermined position and the wheelchair can be moved up / down at a certain height.

  Since the wheelchair according to the sixth aspect is equipped with the wheelchair lifting mechanism, the wheelchair can be lifted and lowered with respect to the floor surface and the ground.

  In the wheelchair according to claim 7, when the cared person is transferred to a destination site such as an automobile seat, the height of the seat surface portion of the wheelchair is generally lower than the height of the automobile seat. When transferring, the height of the seating surface of the wheelchair can be made higher than the height of the car seat, and it can also be tilted downward at the rear, so that the cared person can slide easily and easily In addition, even when the vehicle seat is moved from the automobile seat to the seat surface portion of the wheelchair, the cared person can be easily and smoothly slid down and transferred.

  The wheelchair according to claim 8 can slide the substantially U-shaped frame at the upper end of the backrest frame in the longitudinal direction, so that the backrest frame can be lengthened when the cared person is transferred to an automobile seat or the like. It is easy to place the upper end of the frame on the car seat. When the caregiver pushes and moves the wheelchair, slide the approximately U-shaped frame at the upper end of the backrest frame in the longitudinal direction and shorten it. Since the upper end of the drowning frame can be lowered in the height direction, there is an effect that it is easy to see the front without obstructing the view of the person pushing the wheelchair.

It is a top view explaining the outline | summary of the 1st form (rotation power transmission part) of the wheelchair raising / lowering mechanism of this invention. It is a right view explaining the outline | summary of the 1st form (rotation power transmission part) of the wheelchair raising / lowering mechanism (a drive part is abbreviate | omitted) of this invention. It is a rear view explaining the outline | summary of the 1st form (rotation power transmission part) of the wheelchair raising / lowering mechanism (a drive part is abbreviate | omitted) of this invention. It is a longitudinal cross-sectional view of the raising / lowering mechanism explaining the structure of an raising / lowering mechanism. It is a figure explaining the raising / lowering state of the screw rod body of an raising / lowering mechanism, and is a figure which shows the time of a fall and a raise. It is a top view for explanation explaining composition of the 1st form (rotation power transmission part) of a wheelchair raising / lowering mechanism (a drive part is omitted) of the present invention. It is explanatory drawing of the A section of FIG. 6, and is a top view for description of the inter-shaft connection gear mechanism explaining the structure of the inter-shaft connection gear mechanism. It is a figure which shows the state which bent the left-right direction transmission shaft of the 1st form (rotation power transmission part) of the wheelchair raising / lowering mechanism (drive part is abbreviate | omitted) of this invention with the universal joint. It is a top view explaining the outline | summary of the 2nd form (rotation power transmission part) of the wheelchair raising / lowering mechanism of this invention. It is an explanatory top view explaining the composition of the 2nd form (rotation power transmission part) of the wheelchair raising / lowering mechanism (a drive part is omitted) of the present invention. FIG. 9 is an explanatory diagram of a detection state of a detector that detects the position of a screw rod body in a drawing of an elevating mechanism in a vertical cross-sectional view of a cylindrical body or a housing, and (a) shows a case where the screw rod body reaches the rising end position. It is a figure shown, (b) is a figure which shows the case where a screw rod body reaches | attains the descent | fall end position. It is explanatory drawing of a substantially U-shaped frame. It is a right view of the wheelchair before attaching a wheelchair raising / lowering mechanism. It is a right view of the wheelchair after attaching a wheelchair raising / lowering mechanism. It is a figure which shows the state which lifted up the wheelchair by the raising / lowering mechanism. It is a figure which shows the state which lifted up the wheelchair by the raising / lowering mechanism, and lowered the backrest part back below the horizontal surface by the inclination means. It is a figure which shows the state which lifted up a wheelchair a little with the raising / lowering mechanism, and inclined the backrest part back upwards slightly from the horizontal surface by the inclination means. It is a figure which shows the state when changing to the seat of a motor vehicle from a wheelchair. It is a figure which shows the state when changing to the wheelchair from the seat of a motor vehicle. It is explanatory drawing of the wheelchair which a seat surface sheet | seat does not raise / lower. It is explanatory drawing of the wheelchair which made it raise / lower only a seat surface part to the wheelchair of FIG. It is explanatory drawing of the wheelchair which attached the wheelchair raising / lowering mechanism of this invention to the wheelchair of FIG. 20, and made it raise / lower the whole wheelchair.

  The wheelchair lifting mechanism 1 according to the present invention is a wheelchair lifting mechanism 1 mounted on the wheelchair 2 that allows the wheelchair 2 to be lifted as shown in FIGS. 1 to 11. The four raising / lowering mechanisms 3 erected in the vicinity of the left and right front and rear ends of the seat surface part 20 of the wheelchair 2, the driving part 4 for generating a turning force, and the turning force of the driving part 4 are transmitted to the lifting mechanism 3. A rotating power transmission unit 5, and the elevating mechanism 3 is a screw rod body 30 that is freely movable in the vertical direction while rotating, and is arranged coaxially with the screw rod body 30 and in the vertical direction. A screw rod driving gear 33 having inner teeth 31 screwed with the screw rod body 30 and outer teeth 32 screwed with the gears of the rotational power transmission unit 5. As shown in FIG. 5, FIG. 14 or FIG. The lower end of the body 30 lands on the floor surface G to separate the wheelchair 2 and the floor surface G, and when the screw rod body 30 moves upward, the lower end of the screw rod body 30 is separated from the floor surface. The wheelchair 2 is landed on the floor.

  The wheelchair lifting mechanism 1 can be attached to the wheelchair 50 in the manufacturing stage, and can be additionally attached to the wheelchair 50 distributed in the market as shown in FIG. 13, for example. And the wheelchair raising / lowering mechanism 1 can raise / lower the wheelchair 2 with respect to the floor G (the ground is also the same).

  A total of four elevating mechanisms 3 are provided in the vicinity of the left and right front and rear ends of the seat portion 20 of the wheelchair 2. For example, the elevating mechanism 3 is attached along the outer walls of the four leg portions of the wheelchair 2, and the screw rod body 30 can be inserted into the cylindrical leg portions of the four wheelchairs 2. There is a form of attaching, or a form of attaching the lifting mechanism 3 to a frame in the vicinity of the four leg portions of the wheelchair 2. The mounting form is not limited as long as the wheelchair 2 can be stably mounted at a position where it can be lifted and lowered.

  As shown in FIG. 4, the elevating mechanism 3 is provided with a total of four standing rods in the vicinity of the left and right front and rear ends of the seat surface portion 20 of the wheelchair 2 and can be freely moved in the vertical direction while rotating. 30, and the inner teeth 31 that are arranged coaxially with the screw rod body 30 and are restricted from moving in the vertical direction and screwed with the screw rod body 30, and the gear 43 of the rotational power transmission unit 5. A screw rod body drive gear 33 having external teeth 32 is provided.

  The screw rod body 30 is a rod-shaped body, and a screw is engraved on the outer peripheral surface. Then, the screw rod body driving gear 33 having the inner teeth 31 is screwed in the inserted state, and when the screw rod body driving gear 33 rotates, the screw rod body 30 moves up and down while rotating. At the lower end of the screw rod body 30, a landing portion 35 having a flat surface whose bottom side is wider than the cross-sectional area of the screw rod body 30 is fixed by screwing or the like. The landing portion 35 enhances the stability for maintaining the posture of the screw rod body 30 with respect to the floor surface or the ground G.

  The screw rod driving gear 33 is a spur gear having internal teeth 31 and external teeth 32. Bearings are arranged on the upper side and the lower side, and can be rotated in the horizontal direction so that the vertical movement is restricted. Yes. The internal teeth 31 are screwed with the screw rod body 30, and the external teeth 32 are screwed with the gear 43 of the rotational power transmission unit 5.

  Next, as shown in FIGS. 1 and 6, the rotating power transmission unit 5 includes a left-right direction transmission shaft 6 that is disposed on the front side or the rear side of the wheelchair 2 and transmits a vertical rotation in the left-right direction. A first form having a substantially U-shape in a plan view with a front-rear direction transmission shaft 7 for transmitting the vertical rotation disposed in the left and right sides of the wheelchair 2 in the front-rear direction, or FIG. 9 or FIG. As shown in FIG. 10, there is a second configuration in which two front-rear transmission shafts 7, which are arranged on the left side and the right side of the wheelchair 2 and transmit the vertical rotation in the front-rear direction, are arranged side by side in a plan view.

  In both the first and second configurations, the lifting mechanisms 3 are disposed at all four positions of the front and rear end portions of the left and right front and rear direction transmission shafts 7, respectively. The lifting mechanism 3 is connected to a lifting force transmission gear mechanism 9. Moreover, in the case of the substantially U-shaped first form in the plan view, as shown in FIGS. 6 and 7, the left and right end portions of the left and right direction transmission shaft 6 and one end of the left and right front and rear direction transmission shaft 7 are used. Are connected by an inter-shaft connecting gear mechanism 8.

  In the case of the substantially U-shaped first form in the plan view, as shown in FIG. 4, FIG. 6 or FIG. Are connected via the lifting force transmission gear mechanism 9, and are connected to the left-right transmission shaft 6 via the inter-shaft connection gear mechanism 8.

  In the case of the second configuration arranged side by side in the plan view, as shown in FIG. 9 and FIG. 10, the front-rear direction transmission shaft 7 is different from the elevating mechanism 3 disposed at the front and rear of the left and right respectively. The transmission gear mechanism 9 is connected.

  As shown in FIG. 1, FIG. 2 or FIG. 9, the front-rear direction transmission shaft 7 only needs to be able to transmit the rotational force from the drive unit 4 so as to synchronize the lifting and lowering of the lifting mechanism 3. For example, a flexible shaft that can be bent may be used, or a linear rod-like body having rigidity may be used. For example, when a flexible shaft that can be bent is used in the central region of the front-rear direction transmission shaft 7, the front-rear ends of the front-rear direction transmission shaft 7 are connected to a bevel gear 41 and a coaxial rod-shaped rotation shaft. The joint 48 is used.

  Further, the left-right direction transmission shaft 6 in the case of the first form having a substantially U-shape in plan view has three positions, ie, substantially both end portions and substantially central portions in the left-right direction, as shown in FIGS. The bending rotation connecting means 10 which can be bent and can transmit rotational power is provided. An example of the rotation connecting means 10 is a universal joint. Thereby, as shown in FIG. 8, the left-right direction transmission shaft 6 can be easily bent.

  As shown in FIG. 4, the lifting force transmission gear mechanism 9 rotates the front-rear direction transmission shaft 7 in the horizontal direction around the external teeth 32 of the screw rod body driving gear 33 of the lifting mechanism 3. It has a function to transmit. In the lifting force transmission gear mechanism 9, a bevel gear 42 is disposed at the upper portion and a spur gear 43 is disposed coaxially with the bevel gear 42 at the lower portion. The upper bevel gear 42 is screwed with the bevel gear 41 disposed at the end of the left-right direction transmission shaft 7 to convert the vertical rotation of the front-rear direction transmission shaft 7 into a horizontal rotation, The lower spur gear 43 is engaged with the external teeth 32 of the screw rod drive gear 33 to rotate the screw rod drive gear 33 in the horizontal direction.

  Next, the drive unit 4 may be manually operated manually or electrically driven by a motor. As a power source of the drive unit 4 in the case of an electric form such as a motor, a cigarette lighter, a 12V battery, and a storage battery of an automobile can be used as a power source when a 12V power source is used. In the case of the manual mode, as shown in FIG. 3, FIG. 6, or FIG. 10, the drive unit connecting unit 18 corresponding to the end of the left-right transmission shaft 6 is manually rotated.

  In the case of an electric form such as a motor, for example, a method for controlling the ascending / descending time of the ascending / descending mechanism 3 such that the motor is operated for a predetermined time when a start button is pressed with a control unit set for an operating time, or As shown in FIG. 11, detectors 15 and 16 that detect that the screw rod body 30 of the elevating mechanism 3 has reached the rising end or the lowering end, and the driving unit 4 such as the motor and the detection means 15, 16, the start button is pressed, the motor of the driving unit 4 is started to operate by the control unit, and the motor is stopped by the detection of the rising end or the falling end from the detection means 15, 16. There is a way to make it. The rotation shaft of the driving unit 4 is connected to a driving unit connecting unit 18 corresponding to the end of the left-right direction transmission shaft 6 via a speed reduction unit. In the case of the electric form, the number of drive parts 4 such as motors is one when the rotational power transmission part 5 is in the first form as shown in FIG. In the case where the rotating power transmission unit 5 is in the second form, two places are provided.

  Examples of the detectors 15 and 16 include contactless detectors such as magnet switches and proximity switches, limit switches, and the like. As shown in FIG. 11, if the material of the screw rod body 30 of the elevating mechanism 3 is a magnetic material such as iron and the cylindrical body 34 into which the screw rod body 30 is inserted is a non-magnetic material such as aluminum, the magnet A switch can be used. For example, when the screw rod body 30 reaches the rising end position as shown in FIG. 11A, the magnet switch (detector 15) is turned on, and as shown in FIG. When reaching, the magnet switch (detector 16) is turned off.

  Next, as shown in FIG. 7, the inter-shaft coupling gear mechanism 8 is disposed at the end portions of the bevel gear 45 and the front-rear direction transmission shaft 7 disposed at both ends of the left-right direction transmission shaft 6. The bevel gear 46 is screwed, and the vertical rotation of the drive unit 4 is transmitted to the left and right front-rear transmission shafts 7 via the gear 45 disposed on the left-right transmission shaft 6. Since the number and size of teeth of the bevel gears 45 and 46 to be screwed are the same, the rotation of the left-right direction transmission shaft 6 and the rotation of the front-rear direction transmission shaft 7 are synchronized. .

  Next, the wheelchair lifting mechanism 1 is mounted on a wheelchair 50 as shown in FIG. 13, for example. Thereby, as shown in FIG. 14, the wheelchair 2 equipped with the wheelchair lifting mechanism 1 is completed. The wheelchair 50 can be mounted at the manufacturing stage of the wheelchair 50, or can be mounted on the wheelchair 50 distributed in the market or the wheelchair 50 in use.

  The wheelchair 50 is provided with tilting means 12 for tilting the backrest frame 51 with the backrest portion 11 of the wheelchair 50 tilting about the left and right lower ends of the backrest frame 51 constituting the backrest portion 11 as the rotation center 52. As shown in FIG. 18 or FIG. 22, the backrest frame 51 can be rotated to an arbitrary posture from a substantially vertical posture to a posture in which the back frame 51 is tilted further downward from a horizontal state. As the angle to be inclined downward, for example, as shown in FIG. 16, it is possible to incline to the rear and about 15 ° below the horizontal, as shown in FIG. It can also be inclined at an inclination angle. In addition, a restricting means (not shown) for maintaining an inclined posture is also provided. The inclination angle can be arbitrarily set by the inclination means 12.

  Further, the backrest frame 51 is composed of a substantially U-shaped frame 53 as shown in FIG. 12 which is an upper part and a pipe-like left and right frame 54 which is a lower part, as shown in FIGS. In addition, the guide bar bodies 55 that are part of the left and right sides of the substantially U-shaped frame 53 that is the upper part are inserted into the pipe-shaped left and right frames 54 that are the lower part, and the substantially U-shaped frame 53 is slid. By doing so, the length of the backrest frame 51 in the longitudinal direction can be adjusted.

  As shown in FIGS. 20 to 22, the wheelchair 2 is provided with a seat surface sheet 71 on the seat surface portion 20 and a backrest seat 72 on the backrest portion 11, and the seat surface seat 71 and the backrest seat 72. A cushion 73 that can slide on is used. On the seat sheet 71 and the backrest sheet 72, a cushion cushion 73 on which a care recipient is seated is slid. Thereby, the cared person can be easily moved from the wheelchair 2.

  Next, as a method of raising and lowering the height of the seat surface portion 20 of the wheelchair 50 that tilts the backrest portion 11 with the tilting means 12 as shown in FIG. 20, only the seat surface portion 20 as shown in FIG. The case where it raises / lowers and the case where the wheelchair 2 equipped with the wheelchair raising / lowering mechanism 1 of this invention was raised / lowered as shown in FIG. 22 are compared.

  As shown in FIG. 21, when only the seat surface portion 20 of the seat surface sheet 71 is raised and lowered by lift means L such as a manual jack, for example, a veneer plate, a plastic plate, a wooden plate, a non-ferrous metal plate, an iron plate, etc. The seat surface sheet 71 and the backrest sheet 72 are connected by a hinge 75, but a vertical space S between the backrest sheet 72 and the backrest frame 51 is generated. There is a concern that the weight of the cared person is added to the hinge 75 and the hinge 75 is damaged due to repeated actions of the caregiver moving.

  In the case of the wheelchair 2 equipped with the wheelchair lifting mechanism 1 of the present invention, as shown in FIG. 22, the backrest frame 51 and the backrest seat 72 are in close contact with each other. Therefore, there is no fear of damage due to repeated actions of transfer of care recipients. As described above, when only the seat surface portion 20 is raised and lowered, there is a fear of damage due to repeated use, but in the case of the wheelchair 2 equipped with the wheelchair lifting mechanism 1 of the present invention, the wheelchair 2 is lifted and lowered so that the use is repeated. There is no fear of damage due to.

  Next, the usage method of the wheelchair 2 equipped with the wheelchair lifting mechanism 1 will be described. As shown in FIG. 18, for example, a case of transferring from the wheelchair 2 onto the vehicle seat 60 will be described. In this case, the height of the upper surface of the vehicle seat 60 is higher than the seat surface portion 20 of the wheelchair 2. For this reason, as shown in FIG. 15, the screw rod body 30 of the elevating mechanism 3 is protruded downward to separate the wheel of the wheelchair 2 from the ground G, and the height of the seat surface portion 20 of the wheelchair 2 is set to the height of the seat 60 of the automobile. Make it higher than the height of the top surface. Then, as shown in FIG. 16, FIG. 18, or FIG. 22, the backrest frame 51 is inclined backward and below the horizontal plane by the inclination means 12. Then, the substantially U-shaped frame 53 of the backrest frame 51 is pulled out, and the tip of the substantially U-shaped frame 53 is placed on the seat 60 of the automobile. Since the height of the seat surface portion 20 of the wheelchair 2 is now higher than the height of the upper surface of the seat 60 of the automobile, the transfer can be facilitated.

  Thereby, the cushion 73 on which the cared person is placed can be easily moved from the wheelchair 2 in the direction S1 shown in FIG.

  Next, as shown in FIG. 19, for example, a case of transferring to the wheelchair 2 from the automobile seat 60 will be described. In this case, as shown in FIG. 19, the screw rod body 30 of the elevating mechanism 3 is raised so that the height of the seat surface portion 20 of the wheelchair 2 is lower than the height of the upper surface of the seat 60 of the automobile. Then, the backrest frame 51 is tilted rearward by the tilting means 12 as shown in FIGS. Then, the substantially U-shaped frame 53 of the backrest frame 51 is pulled out, and the tip of the substantially U-shaped frame 53 is placed on the seat 60 of the automobile. Since the height of the seat surface portion 20 of the wheelchair 2 is now lower than the height of the upper surface of the automobile seat 60, the transfer can be facilitated.

  Thereby, the cushion 73 on which the cared person is placed can be easily moved from the automobile seat 60 in the direction S2 shown in FIG. 19 to the wheelchair 2.

DESCRIPTION OF SYMBOLS 1 Wheelchair raising / lowering mechanism 2 Wheelchair 3 Lifting mechanism 4 Drive part 5 Rotation power transmission part 6 Left-right direction transmission shaft 7 Front-rear direction transmission shaft 8 Interaxial connection gear mechanism 9 Lifting force transmission gear mechanism 10 Bending rotation connection means 11 Backrest part 12 Inclining means 15 Detector 16 Detector 18 Drive portion connecting portion 20 Seat surface portion 30 Screw rod body 31 Internal teeth 32 External teeth 33 Screw rod body drive gear 34 Cylindrical body 35 Grounding portion 48 Joint 50 Wheelchair 51 Backrest frame 52 Rotation Center 53 Substantially U-shaped frame 54 Pipe-shaped frame 55 Guide rod body 60 Seat 70 Wheelchair 71 Seat surface seat 72 Backrest seat 73 Seat cushion 75 Hinge G Floor or ground L Lifting means S Clearance S1 Direction S2 Direction

  The present invention includes a wheelchair lifting mechanism that can lift and lower a wheelchair body with respect to a floor surface and the ground, and the wheelchair lifting mechanism, and the backrest portion can be tilted with respect to a seating surface. It is related with the wheelchair which can be folded in a part.

  In Patent Document 1, an oil tank, a pump, and a pressure handle are arranged on one side of the wheelchair, a hydraulic cylinder is arranged on the left and right, a hydraulic pipe is arranged between the left and right, and the seat portion is moved up and down. A folding wheelchair is disclosed.

  In Patent Document 2, an elevating unit such as a gas cylinder or an electric actuator is disposed below the seat surface portion in the center portion in the left-right direction, and an X-shaped link capable of folding the machine frame supporting the seat surface portion in the left-right direction is provided. A wheelchair is disclosed.

JP 2013-34595 A JP 2008-259757 A

  In the invention of Patent Document 1, since an oil tank and a pump are arranged on one side and a hydraulic cylinder is arranged on both sides as an elevating mechanism, the overall weight becomes heavy and the left and right weight balance becomes heavy on one side and is difficult to handle. was there. In addition, since the backrest portion is not structured to be able to tilt backward, there is a problem that it is not easy to move the cared person to an automobile seat or the like by tilting the backrest portion backward.

  The invention of Patent Document 2 has a problem that the lifting unit such as a gas cylinder or an electric actuator is disposed below the seat surface portion in the center portion in the left-right direction as the lifting mechanism, so that it becomes heavy overall and difficult to handle. In addition, since the backrest portion is not structured to be able to tilt backward, there is a problem that it is not easy to move the cared person to an automobile seat or the like by tilting the backrest portion backward.

  The present invention was devised in view of such problems, and includes a wheelchair lifting mechanism that can lift and lower a wheelchair body with respect to the floor surface and the ground, and the wheelchair lifting mechanism, and the backrest portion is inclined backward with respect to the seating surface. An object of the present invention is to provide a wheelchair that can be folded at the left and right center when it is not in use.

The wheelchair elevating mechanism according to claim 1 is a wheelchair elevating mechanism mounted on the wheelchair that allows the wheelchair to elevate, and the wheelchair elevating mechanism stands in the vicinity of the left and right front and rear ends of the seat surface portion of the wheelchair. Provided with four raising / lowering mechanisms provided, a driving part for generating a turning power, and a turning power transmission part for transmitting the turning power of the driving part to the lifting mechanism, and the lifting mechanism is rotated. A screw rod body that can move freely in the vertical direction, an inner tooth that is coaxially arranged with the screw rod body and that is restricted from moving in the vertical direction, and that engages with the screw rod body, and the rotational power transmission portion A screw for driving a rod body having external teeth to be engaged with the gear of the wheel, and when the screw rod body moves downward, the lower end of the screw rod body lands on the floor surface and the wheelchair. The floor is separated from the floor surface, and when the screw rod body moves upward, the lower end of the screw rod body is the floor surface. Et spaced by landing the wheelchair on the floor, the rotational force transmission unit, the left-right direction transmission shaft and of said wheelchair for transmitting the vertical rotation be disposed on the front side or rear side of the wheelchair in the lateral direction It has a front-rear direction transmission shaft that is transmitted on the left side and the right side in the up-down direction, and is arranged on the left side and right side of the wheelchair. A second configuration in which two longitudinal transmission shafts that transmit the vertical rotation in the longitudinal direction are arranged in a plan view, and both the first and the second configurations are the left and right longitudinal transmissions. The elevating mechanism is disposed at all four positions on the front and rear end portions of the shaft, and both end portions of the front and rear direction transmission shaft and the elevating mechanism are connected by a lifting force transmission gear mechanism.

The wheelchair elevating mechanism according to claim 2 is the folding mechanism according to claim 1 , wherein the wheelchair elevating mechanism can be bent at approximately three positions of the both ends and the substantially central portion of the left-right direction transmission shaft in the first embodiment and can transmit rotational power. A rotation connecting means is provided.

A wheelchair lifting mechanism according to a third aspect of the present invention is characterized in that, in the first or second aspect , the drive unit is in a manual form by hand or an electric form by a motor.

The wheelchair lifting mechanism according to a fourth aspect of the present invention is the wheelchair lifting mechanism according to any one of the first to third aspects, wherein the screw rod body of the lifting mechanism reaches an ascending end or a descending end when the drive unit is an electric form using a motor. And a control unit that controls the motor drive unit and the detection unit. The control unit starts operating the motor of the drive unit, and the rising end from the detection unit is provided. Alternatively, the motor is stopped by detecting the arrival at the descending end.

The wheelchair according to claim 5 is equipped with the wheelchair lifting mechanism according to any one of claims 1 to 4 .

A wheelchair according to a sixth aspect of the present invention is the wheelchair according to the fifth aspect , wherein the backrest frame is moved backward from a substantially vertical posture with the backrest portion of the wheelchair as the center of rotation at the left and right lower ends of the backrest frame constituting the backrest portion. It is characterized by comprising tilting means that can be rotated to give any posture from a horizontal state to a posture tilted further downward.

The wheelchair according to claim 7 is the wheelchair according to claim 5 or 6 , wherein the backrest frame is part of the left and right sides of the substantially U-shaped frame that is the upper part in the pipe-like left and right frames that are the lower part The length of the backrest frame in the longitudinal direction can be adjusted by inserting and sliding the U-shaped frame.

Since the wheelchair lifting mechanism according to any one of claims 1 to 4 raises and lowers not only the seat surface portion of the wheelchair but also the entire wheelchair, the backrest portion is inclined backward compared to the case where only the seat surface portion is raised and lowered. When this happens, there is no step between the seat frame and back frame, and there is no difference between the seat on the seat frame and the back seat on the back frame. Therefore, since the weight of the cared person is added to the backrest frame and the seat frame, the cared person can easily transfer, and there is an effect that the backrest seat or the like is not damaged.

  And it has the effect that it can attach to the wheelchair currently distribute | circulated on the market including the wheelchair in use by additional construction.

  In addition, the form of the rotational power transmission portion is a vertical transmission shaft disposed on the left or right side of the wheelchair and a left-right transmission shaft that transmits the vertical rotation disposed on the front or rear side of the wheelchair in the left-right direction. In the case of the first form having a front-rear direction transmission shaft for transmitting the rotation in the front-rear direction and having a substantially U-shape in plan view, the gear and the rotation shaft are used as the means for transmitting the rotational force. It is possible to synchronize the raising and lowering of the raising and lowering mechanisms by the mechanism of the rotating power transmission unit. In addition, when the form of the rotational power transmission part is the second form, the raising / lowering of the four raising / lowering mechanisms is synchronized by deciding the position of the ascending end or descending end with the detector and matching the start of operation with the control part. It can be made.

Since the wheelchair elevating mechanism according to claim 2 can bend the right-and-left direction transmission shaft, the wheelchair elevating mechanism can be used at the time of non-use such as during wheelchair storage even if the turning power transmission portion is in the first form. You can fold a wheelchair equipped with In the case where the rotating power transmission portion is in the second form, there is no obstacle in the left-right direction, so the wheelchair can be folded when not in use, such as during storage.

The wheelchair lifting mechanism according to claim 3 can be lifted or lowered manually or electrically.

Since the wheelchair according to claim 4 can be controlled to stop the operation of the drive unit 4 by detecting that the lift unit has reached the ascending or descending end after the operation of the elevating mechanism is started, the drive unit is electrically operated. In the case of the embodiment, if the operator presses the start button for starting up / down, it can be automatically stopped at a predetermined position and the wheelchair can be moved up / down at a certain height.

Since the wheelchair according to the fifth aspect is equipped with the wheelchair lifting mechanism, the wheelchair can be lifted and lowered with respect to the floor and the ground.

In the wheelchair according to claim 6, when the cared person is transferred to a destination site such as an automobile seat, the height of the seat surface portion of the wheelchair is generally lower than the height of the automobile seat. When transferring, the height of the seating surface of the wheelchair can be made higher than the height of the car seat, and it can also be tilted downward at the rear, so that the cared person can slide easily and easily In addition, even when the vehicle seat is moved from the automobile seat to the seat surface portion of the wheelchair, the cared person can be easily and smoothly slid down and transferred.

Since the wheelchair according to claim 7 can slide the substantially U-shaped frame at the upper end of the backrest frame in the longitudinal direction, when the cared person is transferred to an automobile seat or the like, the backrest frame is lengthened and the backrest is placed. It is easy to place the upper end of the frame on the car seat. When the caregiver pushes and moves the wheelchair, slide the approximately U-shaped frame at the upper end of the backrest frame in the longitudinal direction and shorten it. Since the upper end of the drowning frame can be lowered in the height direction, there is an effect that it is easy to see the front without obstructing the view of the person pushing the wheelchair.

It is a top view explaining the outline | summary of the 1st form (rotation power transmission part) of the wheelchair raising / lowering mechanism of this invention. It is a right view explaining the outline | summary of the 1st form (rotation power transmission part) of the wheelchair raising / lowering mechanism (a drive part is abbreviate | omitted) of this invention. It is a rear view explaining the outline | summary of the 1st form (rotation power transmission part) of the wheelchair raising / lowering mechanism (a drive part is abbreviate | omitted) of this invention. It is a longitudinal cross-sectional view of the raising / lowering mechanism explaining the structure of an raising / lowering mechanism. It is a figure explaining the raising / lowering state of the screw rod body of an raising / lowering mechanism, and is a figure which shows the time of a fall and a raise. It is a top view for explanation explaining composition of the 1st form (rotation power transmission part) of a wheelchair raising / lowering mechanism (a drive part is omitted) of the present invention. It is explanatory drawing of the A section of FIG. 6, and is a top view for description of the inter-shaft connection gear mechanism explaining the structure of the inter-shaft connection gear mechanism. It is a figure which shows the state which bent the left-right direction transmission shaft of the 1st form (rotation power transmission part) of the wheelchair raising / lowering mechanism (drive part is abbreviate | omitted) of this invention with the universal joint. It is a top view explaining the outline | summary of the 2nd form (rotation power transmission part) of the wheelchair raising / lowering mechanism of this invention. It is an explanatory top view explaining the composition of the 2nd form (rotation power transmission part) of the wheelchair raising / lowering mechanism (a drive part is omitted) of the present invention. FIG. 9 is an explanatory diagram of a detection state of a detector that detects the position of a screw rod body in a drawing of an elevating mechanism in a vertical cross-sectional view of a cylindrical body or a housing, and (a) shows a case where the screw rod body reaches the rising end position. It is a figure shown, (b) is a figure which shows the case where a screw rod body reaches | attains the descent | fall end position. It is explanatory drawing of a substantially U-shaped frame. It is a right view of the wheelchair before attaching a wheelchair raising / lowering mechanism. It is a right view of the wheelchair after attaching a wheelchair raising / lowering mechanism. It is a figure which shows the state which lifted up the wheelchair by the raising / lowering mechanism. It is a figure which shows the state which lifted up the wheelchair by the raising / lowering mechanism, and lowered the backrest part back below the horizontal surface by the inclination means. It is a figure which shows the state which lifted up a wheelchair a little with the raising / lowering mechanism, and inclined the backrest part back upwards slightly from the horizontal surface by the inclination means. It is a figure which shows the state when changing to the seat of a motor vehicle from a wheelchair. It is a figure which shows the state when changing to the wheelchair from the seat of a motor vehicle. It is explanatory drawing of the wheelchair which a seat surface sheet | seat does not raise / lower. It is explanatory drawing of the wheelchair which made it raise / lower only a seat surface part to the wheelchair of FIG. It is explanatory drawing of the wheelchair which attached the wheelchair raising / lowering mechanism of this invention to the wheelchair of FIG. 20, and made it raise / lower the whole wheelchair.

  The wheelchair lifting mechanism 1 according to the present invention is a wheelchair lifting mechanism 1 mounted on the wheelchair 2 that allows the wheelchair 2 to be lifted as shown in FIGS. 1 to 11. The four raising / lowering mechanisms 3 erected in the vicinity of the left and right front and rear ends of the seat surface part 20 of the wheelchair 2, the driving part 4 for generating a turning force, and the turning force of the driving part 4 are transmitted to the lifting mechanism 3. A rotating power transmission unit 5, and the elevating mechanism 3 is a screw rod body 30 that is freely movable in the vertical direction while rotating, and is arranged coaxially with the screw rod body 30 and in the vertical direction. A screw rod driving gear 33 having inner teeth 31 screwed with the screw rod body 30 and outer teeth 32 screwed with the gears of the rotational power transmission unit 5. As shown in FIG. 5, FIG. 14 or FIG. The lower end of the body 30 lands on the floor surface G to separate the wheelchair 2 and the floor surface G, and when the screw rod body 30 moves upward, the lower end of the screw rod body 30 is separated from the floor surface. The wheelchair 2 is landed on the floor.

  The wheelchair lifting mechanism 1 can be attached to the wheelchair 50 in the manufacturing stage, and can be additionally attached to the wheelchair 50 distributed in the market as shown in FIG. 13, for example. And the wheelchair raising / lowering mechanism 1 can raise / lower the wheelchair 2 with respect to the floor G (the ground is also the same).

  A total of four elevating mechanisms 3 are provided in the vicinity of the left and right front and rear ends of the seat portion 20 of the wheelchair 2. For example, the elevating mechanism 3 is attached along the outer walls of the four leg portions of the wheelchair 2, and the screw rod body 30 can be inserted into the cylindrical leg portions of the four wheelchairs 2. There is a form of attaching, or a form of attaching the lifting mechanism 3 to a frame in the vicinity of the four leg portions of the wheelchair 2. The mounting form is not limited as long as the wheelchair 2 can be stably mounted at a position where it can be lifted and lowered.

  As shown in FIG. 4, the elevating mechanism 3 is provided with a total of four standing rods in the vicinity of the left and right front and rear ends of the seat surface portion 20 of the wheelchair 2 and can be freely moved in the vertical direction while rotating. 30, and the inner teeth 31 that are arranged coaxially with the screw rod body 30 and are restricted from moving in the vertical direction and screwed with the screw rod body 30, and the gear 43 of the rotational power transmission unit 5. A screw rod body drive gear 33 having external teeth 32 is provided.

  The screw rod body 30 is a rod-shaped body, and a screw is engraved on the outer peripheral surface. Then, the screw rod body driving gear 33 having the inner teeth 31 is screwed in the inserted state, and when the screw rod body driving gear 33 rotates, the screw rod body 30 moves up and down while rotating. At the lower end of the screw rod body 30, a landing portion 35 having a flat surface whose bottom side is wider than the cross-sectional area of the screw rod body 30 is fixed by screwing or the like. The landing portion 35 enhances the stability for maintaining the posture of the screw rod body 30 with respect to the floor surface or the ground G.

  The screw rod driving gear 33 is a spur gear having internal teeth 31 and external teeth 32. Bearings are arranged on the upper side and the lower side, and can be rotated in the horizontal direction so that the vertical movement is restricted. Yes. The internal teeth 31 are screwed with the screw rod body 30, and the external teeth 32 are screwed with the gear 43 of the rotational power transmission unit 5.

  Next, as shown in FIGS. 1 and 6, the rotating power transmission unit 5 includes a left-right direction transmission shaft 6 that is disposed on the front side or the rear side of the wheelchair 2 and transmits a vertical rotation in the left-right direction. A first form having a substantially U-shape in a plan view with a front-rear direction transmission shaft 7 for transmitting the vertical rotation disposed in the left and right sides of the wheelchair 2 in the front-rear direction, or FIG. 9 or FIG. As shown in FIG. 10, there is a second configuration in which two front-rear transmission shafts 7, which are arranged on the left side and the right side of the wheelchair 2 and transmit the vertical rotation in the front-rear direction, are arranged side by side in a plan view.

  In both the first and second configurations, the lifting mechanisms 3 are disposed at all four positions of the front and rear end portions of the left and right front and rear direction transmission shafts 7, respectively. The lifting mechanism 3 is connected to a lifting force transmission gear mechanism 9. Moreover, in the case of the substantially U-shaped first form in the plan view, as shown in FIGS. 6 and 7, the left and right end portions of the left and right direction transmission shaft 6 and one end of the left and right front and rear direction transmission shaft 7 are used. Are connected by an inter-shaft connecting gear mechanism 8.

  In the case of the substantially U-shaped first form in the plan view, as shown in FIG. 4, FIG. 6 or FIG. Are connected via the lifting force transmission gear mechanism 9, and are connected to the left-right transmission shaft 6 via the inter-shaft connection gear mechanism 8.

  In the case of the second configuration arranged side by side in the plan view, as shown in FIG. 9 and FIG. 10, the front-rear direction transmission shaft 7 is different from the elevating mechanism 3 disposed at the front and rear of the left and right respectively. The transmission gear mechanism 9 is connected.

  As shown in FIG. 1, FIG. 2 or FIG. 9, the front-rear direction transmission shaft 7 only needs to be able to transmit the rotational force from the drive unit 4 so as to synchronize the lifting and lowering of the lifting mechanism 3. For example, a flexible shaft that can be bent may be used, or a linear rod-like body having rigidity may be used. For example, when a flexible shaft that can be bent is used in the central region of the front-rear direction transmission shaft 7, the front-rear ends of the front-rear direction transmission shaft 7 are connected to a bevel gear 41 and a coaxial rod-shaped rotation shaft. The joint 48 is used.

  Further, the left-right direction transmission shaft 6 in the case of the first form having a substantially U-shape in plan view has three positions, ie, substantially both end portions and substantially central portions in the left-right direction, as shown in FIGS. The bending rotation connecting means 10 which can be bent and can transmit rotational power is provided. An example of the rotation connecting means 10 is a universal joint. Thereby, as shown in FIG. 8, the left-right direction transmission shaft 6 can be easily bent.

  As shown in FIG. 4, the lifting force transmission gear mechanism 9 rotates the front-rear direction transmission shaft 7 in the horizontal direction around the external teeth 32 of the screw rod body driving gear 33 of the lifting mechanism 3. It has a function to transmit. In the lifting force transmission gear mechanism 9, a bevel gear 42 is disposed at the upper portion and a spur gear 43 is disposed coaxially with the bevel gear 42 at the lower portion. The upper bevel gear 42 is screwed with the bevel gear 41 disposed at the end of the left-right direction transmission shaft 7 to convert the vertical rotation of the front-rear direction transmission shaft 7 into a horizontal rotation, The lower spur gear 43 is engaged with the external teeth 32 of the screw rod drive gear 33 to rotate the screw rod drive gear 33 in the horizontal direction.

  Next, the drive unit 4 may be manually operated manually or electrically driven by a motor. As a power source of the drive unit 4 in the case of an electric form such as a motor, a cigarette lighter, a 12V battery, and a storage battery of an automobile can be used as a power source when a 12V power source is used. In the case of the manual mode, as shown in FIG. 3, FIG. 6, or FIG. 10, the drive unit connecting unit 18 corresponding to the end of the left-right transmission shaft 6 is manually rotated.

  In the case of an electric form such as a motor, for example, a method for controlling the ascending / descending time of the ascending / descending mechanism 3 such that the motor is operated for a predetermined time when a start button is pressed with a control unit set for an operating time, or As shown in FIG. 11, detectors 15 and 16 that detect that the screw rod body 30 of the elevating mechanism 3 has reached the rising end or the lowering end, and the driving unit 4 such as the motor and the detection means 15, 16, the start button is pressed, the motor of the driving unit 4 is started to operate by the control unit, and the motor is stopped by the detection of the rising end or the falling end from the detection means 15, 16. There is a way to make it. The rotation shaft of the driving unit 4 is connected to a driving unit connecting unit 18 corresponding to the end of the left-right direction transmission shaft 6 via a speed reduction unit. In the case of the electric form, the number of drive parts 4 such as motors is one when the rotational power transmission part 5 is in the first form as shown in FIG. In the case where the rotating power transmission unit 5 is in the second form, two places are provided.

  Examples of the detectors 15 and 16 include contactless detectors such as magnet switches and proximity switches, limit switches, and the like. As shown in FIG. 11, if the material of the screw rod body 30 of the elevating mechanism 3 is a magnetic material such as iron and the cylindrical body 34 into which the screw rod body 30 is inserted is a non-magnetic material such as aluminum, the magnet A switch can be used. For example, when the screw rod body 30 reaches the rising end position as shown in FIG. 11A, the magnet switch (detector 15) is turned on, and as shown in FIG. When reaching, the magnet switch (detector 16) is turned off.

  Next, as shown in FIG. 7, the inter-shaft coupling gear mechanism 8 is disposed at the end portions of the bevel gear 45 and the front-rear direction transmission shaft 7 disposed at both ends of the left-right direction transmission shaft 6. The bevel gear 46 is screwed, and the vertical rotation of the drive unit 4 is transmitted to the left and right front-rear transmission shafts 7 via the gear 45 disposed on the left-right transmission shaft 6. Since the number and size of teeth of the bevel gears 45 and 46 to be screwed are the same, the rotation of the left-right direction transmission shaft 6 and the rotation of the front-rear direction transmission shaft 7 are synchronized. .

  Next, the wheelchair lifting mechanism 1 is mounted on a wheelchair 50 as shown in FIG. 13, for example. Thereby, as shown in FIG. 14, the wheelchair 2 equipped with the wheelchair lifting mechanism 1 is completed. The wheelchair 50 can be mounted at the manufacturing stage of the wheelchair 50, or can be mounted on the wheelchair 50 distributed in the market or the wheelchair 50 in use.

  The wheelchair 50 is provided with tilting means 12 for tilting the backrest frame 51 with the backrest portion 11 of the wheelchair 50 tilting about the left and right lower ends of the backrest frame 51 constituting the backrest portion 11 as the rotation center 52. As shown in FIG. 18 or FIG. 22, the backrest frame 51 can be rotated to an arbitrary posture from a substantially vertical posture to a posture in which the back frame 51 is tilted further downward from a horizontal state. As the angle to be inclined downward, for example, as shown in FIG. 16, it is possible to incline to the rear and about 15 ° below the horizontal, as shown in FIG. It can also be inclined at an inclination angle. In addition, a restricting means (not shown) for maintaining an inclined posture is also provided. The inclination angle can be arbitrarily set by the inclination means 12.

  Further, the backrest frame 51 is composed of a substantially U-shaped frame 53 as shown in FIG. 12 which is an upper part and a pipe-like left and right frame 54 which is a lower part, as shown in FIGS. In addition, the guide bar bodies 55 that are part of the left and right sides of the substantially U-shaped frame 53 that is the upper part are inserted into the pipe-shaped left and right frames 54 that are the lower part, and the substantially U-shaped frame 53 is slid. By doing so, the length of the backrest frame 51 in the longitudinal direction can be adjusted.

  As shown in FIGS. 20 to 22, the wheelchair 2 is provided with a seat surface sheet 71 on the seat surface portion 20 and a backrest seat 72 on the backrest portion 11, and the seat surface seat 71 and the backrest seat 72. A cushion 73 that can slide on is used. On the seat sheet 71 and the backrest sheet 72, a cushion cushion 73 on which a care recipient is seated is slid. Thereby, the cared person can be easily moved from the wheelchair 2.

  Next, as a method of raising and lowering the height of the seat surface portion 20 of the wheelchair 50 that tilts the backrest portion 11 with the tilting means 12 as shown in FIG. 20, only the seat surface portion 20 as shown in FIG. The case where it raises / lowers and the case where the wheelchair 2 equipped with the wheelchair raising / lowering mechanism 1 of this invention was raised / lowered as shown in FIG. 22 are compared.

  As shown in FIG. 21, when only the seat surface portion 20 of the seat surface sheet 71 is raised and lowered by lift means L such as a manual jack, for example, a veneer plate, a plastic plate, a wooden plate, a non-ferrous metal plate, an iron plate, etc. The seat surface sheet 71 and the backrest sheet 72 are connected by a hinge 75, but a vertical space S between the backrest sheet 72 and the backrest frame 51 is generated. There is a concern that the weight of the cared person is added to the hinge 75 and the hinge 75 is damaged due to repeated actions of the caregiver moving.

  In the case of the wheelchair 2 equipped with the wheelchair lifting mechanism 1 of the present invention, as shown in FIG. 22, the backrest frame 51 and the backrest seat 72 are in close contact with each other. Therefore, there is no fear of damage due to repeated actions of transfer of care recipients. As described above, when only the seat surface portion 20 is raised and lowered, there is a fear of damage due to repeated use, but in the case of the wheelchair 2 equipped with the wheelchair lifting mechanism 1 of the present invention, the wheelchair 2 is lifted and lowered so that the use is repeated. There is no fear of damage due to.

  Next, the usage method of the wheelchair 2 equipped with the wheelchair lifting mechanism 1 will be described. As shown in FIG. 18, for example, a case of transferring from the wheelchair 2 onto the vehicle seat 60 will be described. In this case, the height of the upper surface of the vehicle seat 60 is higher than the seat surface portion 20 of the wheelchair 2. For this reason, as shown in FIG. 15, the screw rod body 30 of the elevating mechanism 3 is protruded downward to separate the wheel of the wheelchair 2 from the ground G, and the height of the seat surface portion 20 of the wheelchair 2 is set to the height of the seat 60 of the automobile. Make it higher than the height of the top surface. Then, as shown in FIG. 16, FIG. 18, or FIG. 22, the backrest frame 51 is inclined backward and below the horizontal plane by the inclination means 12. Then, the substantially U-shaped frame 53 of the backrest frame 51 is pulled out, and the tip of the substantially U-shaped frame 53 is placed on the seat 60 of the automobile. Since the height of the seat surface portion 20 of the wheelchair 2 is now higher than the height of the upper surface of the seat 60 of the automobile, the transfer can be facilitated.

  Thereby, the cushion 73 on which the cared person is placed can be easily moved from the wheelchair 2 in the direction S1 shown in FIG.

  Next, as shown in FIG. 19, for example, a case of transferring to the wheelchair 2 from the automobile seat 60 will be described. In this case, as shown in FIG. 19, the screw rod body 30 of the elevating mechanism 3 is raised so that the height of the seat surface portion 20 of the wheelchair 2 is lower than the height of the upper surface of the seat 60 of the automobile. Then, the backrest frame 51 is tilted rearward by the tilting means 12 as shown in FIGS. Then, the substantially U-shaped frame 53 of the backrest frame 51 is pulled out, and the tip of the substantially U-shaped frame 53 is placed on the seat 60 of the automobile. Since the height of the seat surface portion 20 of the wheelchair 2 is now lower than the height of the upper surface of the automobile seat 60, the transfer can be facilitated.

  Thereby, the cushion 73 on which the cared person is placed can be easily moved from the automobile seat 60 in the direction S2 shown in FIG. 19 to the wheelchair 2.

DESCRIPTION OF SYMBOLS 1 Wheelchair raising / lowering mechanism 2 Wheelchair 3 Lifting mechanism 4 Drive part 5 Rotation power transmission part 6 Left-right direction transmission shaft 7 Front-rear direction transmission shaft 8 Interaxial connection gear mechanism 9 Lifting force transmission gear mechanism 10 Bending rotation connection means 11 Backrest part 12 Inclining means 15 Detector 16 Detector 18 Drive portion connecting portion 20 Seat surface portion 30 Screw rod body 31 Internal teeth 32 External teeth 33 Screw rod body drive gear 34 Cylindrical body 35 Grounding portion 48 Joint 50 Wheelchair 51 Backrest frame 52 Rotation Center 53 Substantially U-shaped frame 54 Pipe-shaped frame 55 Guide rod body 60 Seat 70 Wheelchair 71 Seat surface seat 72 Backrest seat 73 Seat cushion 75 Hinge G Floor or ground L Lifting means S Clearance S1 Direction S2 Direction

Claims (8)

A wheelchair lifting mechanism attached to the wheelchair that allows the wheelchair to be lifted and lowered,
The wheelchair lifting mechanism includes four lifting mechanisms that are erected in the vicinity of the left and right front and rear ends of the seat surface portion of the wheelchair, a drive unit that generates turning force, and the turning force of the driving unit to the lifting mechanism. A rotating power transmission section that transmits power,
The elevating mechanism is screwed into the screw rod body that is freely movable in the vertical direction while rotating, and the screw rod body that is arranged coaxially with the screw rod body and restricted in the vertical movement. A screw rod body drive gear having internal teeth and external teeth that are screwed with the gears of the rotating power transmission unit;
When the screw rod body moves downward, the lower end of the screw rod body lands on the floor surface to separate the wheelchair and the floor surface, and when the screw rod body moves upward, the screw rod A wheelchair lifting mechanism characterized in that the lower end of the body is separated from the floor surface to land the wheelchair on the floor surface. The rotating power transmission unit includes a left-right direction transmission shaft that transmits a vertical rotation provided on the front side or the rear side of the wheelchair in a left-right direction, and a vertical direction rotation provided on the left side and the right side of the wheelchair. The first and second forms of a substantially U-shape in a plan view or a vertical rotation disposed on the left and right sides of the wheelchair are transmitted in the front-rear direction. A second configuration in which two front-rear transmission shafts are juxtaposed in plan view,
In both the first and second configurations, the elevating mechanisms are disposed at all four positions on the front and rear end portions of the left and right front and rear transmission shafts, and both end portions of the front and rear direction transmission shaft and the elevating mechanism are moved up and down. The wheelchair lifting mechanism according to claim 1, wherein the wheelchair lifting mechanism is connected by a force transmission gear mechanism.   The bending rotation connecting means capable of being bent and capable of transmitting rotational power is provided at substantially three ends of the left-right direction transmission shaft in the first embodiment, and substantially at the center. The wheelchair lifting mechanism described.   The wheelchair elevating mechanism according to any one of claims 1 to 3, wherein the driving unit is in a manual form by a manual operation or an electric form by a motor.   When the drive unit is an electric form by a motor, the detection unit that detects that the screw rod body of the elevating mechanism has reached the rising end or the lowering end, and the motor driving unit and the detection unit are controlled. 5. A control unit configured to start the operation of the motor of the driving unit by the control unit, and stop the motor by detecting the arrival of the rising end or the falling end from the detection unit. The wheelchair lifting mechanism according to any one of the above.   A wheelchair comprising the wheelchair lifting mechanism according to any one of claims 1 to 5.   A posture in which the backrest portion of the wheelchair is tilted further downward from a horizontal state by rotating the backrest frame backward from a substantially vertical posture with the left and right lower ends of the backrest frame constituting the backrest portion as a rotation center The wheelchair according to claim 6, further comprising a tilting means capable of causing any posture up to.   The backrest frame is formed by inserting the left and right parts of the substantially U-shaped frame that is the upper part into the pipe-shaped left and right frames that are the lower part and sliding the U-shaped frame. The wheelchair according to claim 6 or 7, wherein the length of the frame in the longitudinal direction is adjustable.

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