WO2013085043A1

WO2013085043A1 - Wheelchair locking device

Info

Publication number: WO2013085043A1
Application number: PCT/JP2012/081822
Authority: WO
Inventors: 堀口　賢治; 貴行田原; 弘行稲垣; 東　千晴
Original assignee: トヨタ車体株式会社
Priority date: 2011-12-09
Filing date: 2012-12-07
Publication date: 2013-06-13
Also published as: CN103987353B; CN103987353A; JP2013121415A; JP5821594B2

Abstract

Provided is a wheelchair locking device which is capable of being securely fixed to a wheelchair without generating deflection, and ensuring durability of a motor. The wheelchair locking device of the present invention comprises: front side traction members (31 and 32) which are connected to a front side of a wheelchair (I) through hooks (21 and 22) disposed at one end; rear side traction members (33 and 34) which are connected to a rear side of the wheelchair (I) through hooks (23 and 24) disposed at the one end; a drive mechanism (DM) which pulls the front and rear side traction members (31, 32, 33, and 34) toward a floor; a detector (8) which detects movement of a portion of the drive mechanism (DM) up to a predetermined position; and a controller (C) which stops the operation of the drive mechanism (DM) using the detection performed by the detector (8). The drive mechanism (DM) pulls only the front side traction members (31 and 32) by a predetermined amount, and then pulls both of the front and rear side traction members (31, 32, 33, and 34).

Description

Wheelchair fixing device

The present invention relates to a wheelchair fixing device that can securely fix even a wheelchair that does not bend, and can ensure the durability of the motor.

As shown in FIG. 8, as a wheelchair fixing device 100 for fixing a wheelchair (not shown) carried into the vehicle interior to the floor of the vehicle body, hooks 102 provided at the ends of the cable 101 are hooked to the front and rear of the wheelchair. After that, Patent Document 1 in which the wheelchair is fixed to the floor of the vehicle body by driving the motor 103 and simultaneously winding the cable 101 by a predetermined amount is known.

This wheelchair fixing device 100 rotates the four gears 105 with one rack 104 to perform the winding operation and the pulling operation of the cable 101 on the rotating drum 106 provided coaxially with the gear 105, and the hook 102 is Fix and unlock the wheelchair that is hung. In the wheelchair fixing device 100 shown in FIG. 8, the limit switch 107 is activated when the rack 104 meshing with the gear 105 moves by a predetermined amount, and the fixing or releasing of the wheelchair is completed.

JP 2006-304866 A

This predetermined amount is set as an amount that is securely fixed in consideration of normal wheelchair tire deflection and frame deflection, but in a wheelchair that does not cause deflection, such as a wheelchair with a flat tire, Before the rack 104 meshing with the gear 105 reaches a predetermined amount of movement, the force for winding the cable 101 is greater than the driving force of the motor 103 and the motor 103 is restrained, and the motor 103 continues to be energized. Thus, there is a problem that the durability of the motor 103 is lowered.

An object of the present invention is to provide a wheelchair fixing device that can be securely fixed even in a wheelchair that does not bend and that can ensure the durability of the motor.

The wheelchair fixing device of the present invention includes a front traction member connected to the front side of the wheelchair via a hook provided at one end, and a rear traction member connected to the rear side of the wheelchair via a hook provided at one end. A drive mechanism for pulling the front and rear traction members toward the floor, a detection means for detecting that a part of the drive mechanism has moved to a predetermined position, and detection of the drive mechanism based on detection of the detection means. Control means for stopping the operation, and the drive mechanism pulls both the front traction member and the front traction member after pulling only the front traction member by a predetermined amount.

The drive mechanism includes a front reel coupled to the other end of the front traction member, a front driven gear that winds up the front traction member, a front driven gear that rotates integrally with the front reel, and the other end of the rear traction member. , A rear reel that winds up the rear traction member, a rear driven gear that rotates integrally with the rear reel, a front drive tooth row that meshes with the front driven gear, and the rear driven A drive rack gear having a rear drive tooth row portion meshing with the gear, and a drive source for driving the drive rack gear, wherein the front drive tooth row portion and the rear drive tooth row portion are one tooth row The wheelchair is configured to be fixed by meshing with the front driven gear and the rear driven gear at a fixed position that is a predetermined distance away from the end, and teeth from the fixed position to the other dentition end. Column length is before The rear drive dentition is shorter than the front drive dentition, and the front drive dentition and the rear drive dentition are respectively connected to the front driven gear and the rear drive dentition from the other dentition end. It is preferable to mesh with the rear driven gear.

The front traction member, the front reel, and the front driven gear are provided in pairs so that they can be connected to the front side of the wheelchair from different directions, and the rear traction member, the rear Two side reels and two rear driven gears are preferably provided so as to form a pair, and can be connected to the rear side of the wheelchair from different directions.

Further, it is preferable that the front driven gear and the rear driven gear are arranged in series in parallel with the extending direction of the drive rack gear.

When the drive mechanism pulls only the front traction member by a predetermined amount and then pulls both the front traction member and the rear traction member, even a wheelchair that does not bend can be securely fixed, and the durability of the motor can be ensured.

It is a general view which shows the wheelchair fixing device of this invention. It is a perspective view which shows the wheelchair fixed with the wheelchair fixing device of this invention. (A)-(c) is a figure for demonstrating the one aspect | mode of the limit switch for stopping the drive rack gear used for the wheelchair fixing device of this invention. (A)-(c) is a figure for demonstrating the other aspect of the limit switch for stopping the drive rack gear used for the wheelchair fixing device of this invention. It is a figure for demonstrating the drive rack gear used for the wheelchair fixing device of this invention. It is an enlarged view of the drive rack gear for demonstrating the front side drive tooth row | line | column part and rear side drive tooth row | line | column part in a drive rack gear. (A)-(c) is a figure which shows the positional relationship of a drive rack gear, a front side driven gear, and a rear side driven gear in the wheelchair fixing device of this invention. It is a figure which shows the conventional wheelchair fixing device.

Hereinafter, the wheelchair fixing device of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the wheelchair fixing device 1 of the present invention is connected to the front side of the wheelchair I through hooks 21 and 22 provided at one end in order to fix the front side of the wheelchair I (see FIG. 2). In order to fix the

rear traction members

31 and 32 and the rear side of the wheelchair I, the

rear traction members

33 and 34 connected to the rear side of the wheelchair I through

hooks

23 and 24 provided at one end are provided. is doing. The wheelchair fixing device 1 detects the drive mechanism DM that pulls the

front traction members

31 and 32 and the

rear traction members

33 and 34 toward the floor, and that a part of the drive mechanism DM has moved to a predetermined position. A detection unit 8 and a control unit C that stops the operation of the drive mechanism DM by detection of the detection unit 8 are provided.

The driving mechanism DM pulls the

front traction members

31 and 32 and the

rear traction members

33 and 34 toward the floor surface, thereby placing the wheelchair I on the floor surface (the wheelchair I such as a lifting platform F described later). It is driven to fix the wheelchair I to the wheelchair fixing device 1. The drive mechanism DM is configured to pull both the

front traction members

31 and 32 and the

rear traction members

33 and 34 after pulling only the

front traction members

31 and 32 by a predetermined amount, as will be described in detail later. Yes.

The detection means 8 detects the amount of movement of the drive mechanism DM and transmits the detected information to the control means C. The control means C may be configured as a control device that can stop at least the operation of the drive mechanism DM, and is connected to the detection means 8 in the embodiment shown in FIG. Also connected to. The control means C may be configured to be able to control other operations such as control of driving the floor on which the wheelchair I is placed, in addition to control for stopping the operation of the drive mechanism DM. .

In the wheelchair fixing apparatus 1 according to the embodiment shown in FIG. 1, the drive mechanism DM includes front reels 41, 42 that wind up the

front traction members

31, 32 and the front reels 41, 42 connected to the other ends of the

front traction members

31, 32. , 42 and front driven

gears

51, 52 that rotate integrally with each other. Further, the drive mechanism DM is connected to the other ends of the

rear traction members

33, 34, and rotates integrally with the

rear reels

43, 44 that wind up the

rear traction members

33, 34 and the

rear reels

43, 44. And rear driven

gears

53 and 54. Further, the drive mechanism DM includes a drive rack gear having

front drive teeth

61 and 62 that mesh with the front driven

gears

51 and 52 and

rear drive teeth

63 and 64 that mesh with the rear driven

gears

53 and 54. 6 and a drive source 7 for driving the drive rack gear 6.

As shown in FIG. 2, the wheelchair fixing device 1 is accommodated in a lifting platform F on which the wheelchair I is placed and moved up and down, and when the wheelchair I is fixed by the wheelchair fixing device 1, the lifting platform mounted on the vehicle. The elevator platform F on which the wheelchair I is placed is moved up and down by an elevator mechanism (not shown) that raises and lowers the wheel F, and the wheelchair I is accommodated in the rear part inside the vehicle. The lifting mechanism is not particularly limited as long as it is a mechanism that can accommodate the wheelchair I in the vehicle, and detailed description thereof is omitted. Further, the wheelchair I may be accommodated inside the vehicle using a slope instead of the lifting mechanism, and the wheelchair I may be fixed by the wheelchair fixing device 1 mounted inside the vehicle.

As shown in FIG. 2, in order to fix the wheelchair I, the

hooks

21, 22, 23, and 24 are hooked on the left and right frames Ia and Ib of the wheelchair I, for example. The

hooks

21, 22, 23, and 24 are not particularly limited as long as the

hooks

21, 22, 23, and 24 can be connected to any place of the wheelchair I.

As shown in FIG. 2,

front traction members

31, 32 such as cables are connected to the front side of the wheelchair I via hooks 21, 22, and the

front traction members

31, 32 are openings provided in the lifting platform F. It extends from the inside of the lifting platform F to the outside of the lifting platform F through H1 and H2. Similarly,

rear traction members

33, 34 such as cables are connected to the rear side of the wheelchair I, and the

rear traction members

33, 34 pass through the openings H 3, H 4 provided in the lift F and the lift F It extends from the inside to the outside of the lifting platform F. As shown in FIG. 1, the

front traction members

31 and 32 and the

rear traction members

33 and 34 in the elevator platform F are changed in direction by a direction changing member P such as a pulley, respectively, and the front reels 41 and 42 and the rear side It is wound around

reels

43 and 44. The openings H1, H2, H3, and H4 are positioned on the front side and the rear side of the wheelchair I in a state where the wheelchair I is placed on the lifting platform F, and the hooks 21 and 22 for the front side of the wheelchair I are provided on the wheelchair I. The

rear hooks

23 and 24 are configured to be pulled and fixed toward the rear side of the wheelchair I. However, the positions of the openings H1, H2, H3, and H4 are not particularly limited to the positions shown in FIG. 2, and the wheelchair I is provided in the vicinity of the lower portion of the central portion of the wheelchair I in a state where the wheelchair I is placed on the lifting platform F. Also good.

In the embodiment of FIG. 1, the front reels 41 and 42 are fixed on the same axis as the front driven

gears

51 and 52, and the front reels 41 and 42 are integrally formed by rotating the front driven

gears

51 and 52. It is configured to rotate. Further, the

rear reels

43 and 44 are provided coaxially with the rear driven

gears

53 and 54, and the

rear reels

43 and 44 are rotated together as the rear driven

gears

53 and 54 rotate. Is configured to do. If the front reels 41 and 42 and the front driven

gears

51 and 52 and the

rear reels

43 and 44 and the rear driven

gears

53 and 54 can rotate together, the front reels 41 and 42 Other members may be interposed between the front driven

gears

51 and 52 and between the

rear reels

43 and 44 and the rear driven

gears

53 and 54.

In the embodiment shown in FIGS. 1 and 2, the

front traction members

31, 32, the front reels 41, 42, and the front driven

gears

51, 52 are provided so as to form a pair, respectively. The

rear traction members

33 and 34, the

rear reels

43 and 44, and the two rear driven

gears

53 and 54 are provided in pairs so that they can be connected to the rear side of the wheelchair I. Connection is possible from different directions. A structure for pulling the front side of the wheelchair I having the

front traction members

31 and 32, the front reels 41 and 42, and the front driven gears 51 and 52, the

rear traction members

33 and 34, the

rear reels

43 and 44, and the rear driven gear. The number of structures for pulling the rear side of the wheelchair I having 53, 54 is not particularly limited, but by providing two each in the front and rear, by pulling and fixing the wheelchair I from four different directions in the front and rear, The wheelchair can be fixed stably and reliably.

In the embodiment shown in FIG. 1, the front driven gears 51 and 52 and the rear driven gears 53 and 54 are arranged in series in parallel with the direction in which the drive rack gear 6 extends. The arrangement of the front driven gears 51 and 52 and the rear driven gears 53 and 54 is not particularly limited as long as the wheelchair I can be pulled from the front-rear direction. For example, the front driven gears 51 and 52 are symmetrical with respect to the direction in which the drive rack gear 6 extends. Thus, two front driven gears 51 and 52 and two rear driven gears 53 and 54 are provided on each side of the drive rack gear 6, and the front drive

tooth row portions

61 and 62 and the rear drive tooth row portion 63 of the drive rack gear 6 are provided. 64 may be provided at positions facing the front driven gears 51 and 52 and the rear driven gears 53 and 54, respectively, but the front driven gears 51 and 52 and the rear driven gears 53 and 54 are extended in the direction in which the drive rack gear 6 extends. By arranging them in series in parallel, the width of the wheelchair fixing device 1 can be reduced, and the members constituting the wheelchair fixing device 1 can be simplified.

The front driven gears 51, 52 and the rear driven gears 53, 54 rotate clockwise on the upper side of the front driven gears 51, 52 and the rear driven gears 53, 54 (the front side in FIG. 1). An urging means S such as a spiral spring for urging is provided. By this biasing means S, the front reels 41 and 42 and the

rear reels

43 and 44 that rotate together with the front driven gears 51 and 52 and the rear driven gears 53 and 54 are wound around the respective front traction members. The

traction members

31 and 32 and the

rear traction members

33 and 34 are biased in the winding direction. Accordingly, when the

hooks

21, 22, 23, 24 are not hooked on the wheelchair I (for example, when the

hooks

21, 22, 23, 24 are removed from the wheelchair I), the

front traction members

31, 32 and the rear The

side traction members

33, 34 are wound around the front reels 41, 42 and the

rear reels

43, 44, and the

hooks

21, 22, 23, 24 are placed in the openings H1, H2, H3, H4 of the lifting platform F. Move in the storage direction. On the other hand, when hooks 21, 22, 23, 24 are hooked on the wheelchair I, a force greater than the urging force of the urging means S is applied to pull out the

front traction members

31, 32 and the

rear traction members

33, 34. Thus, the

hooks

21, 22, 23, and 24 can be hooked on the wheelchair I.

As shown in FIG. 2, the wheelchair I on which the

hooks

21, 22, 23, and 24 are hooked has the

front traction members

31, 32 and the rear side in order to fix the wheelchair I in a stable state on the lifting platform F.

The pulling members

33 and 34 are pulled. To start towing, the vehicle can be provided with a fixing instruction switch (not shown), and the towing can be started by turning on the fixing instruction switch. When the fixing instruction switch is turned on, the drive rack gear 6 is driven by the drive source 7 such as an electric motor, and slides in the direction in which the drive rack gear 6 extends to form a front drive tooth row portion 61 formed on the drive rack gear 6; 62 meshes with the front driven gears 51 and 52, and the rear drive teeth row

portions

63 and 64 mesh with the rear driven gears 53 and 54, so that the front driven gears 51 and 52 and the rear driven gears 53 and 54 rotate. To do. At this time, the front reels 41 and 42 and the

rear reels

43 and 44 also rotate in the same direction to wind up the

front traction members

31 and 32 and the

rear traction members

33 and 34. When the

front traction members

31 and 32 and the

rear traction members

33 and 34 are wound, the wheelchair I is pulled and fixed from both the front side and the rear side, and is stabilized on the lifting platform F.

The wheelchair fixing device 1 shown in FIG. 1 has two detection means 8 so that the driving source 7 is automatically turned off when the wheelchair I is fixed after the fixing instruction switch is turned on to fix the wheelchair I. Is provided. In the embodiment shown in FIG. 1 and FIGS. 3A to 3C, the two detection means 8 are constituted by a fixed state detection limit switch 81 and a fixed release state detection limit switch 82. The fixed state detection limit switch 81 and the fixed release state detection limit switch 82 are spaced apart from each other along the direction in which the drive rack gear 6 extends.

FIG. 3A shows the positional relationship between the drive rack gear 6 and the two detection means 8 in the initial state where the drive rack gear 6 is not driven, that is, in the unlocked state where the wheelchair I is not fixed. In the fixed release state of FIG. 3A, the fixed state detection limit switch 81 is in contact with the side surface of the drive rack gear 6, and the fixed release state detection limit switch 82 is also in the drive rack gear 6. It is in contact with the side and turned on. When the fixing instruction switch provided on the vehicle is turned on from this unlocked state, the drive source 7 drives the drive rack gear 6, and the drive rack gear 6 slides to the right in FIG. b)). As shown in FIG. 3B, when the drive rack gear 6 slides, the fixed state detection limit switch 81 remains in the on state, but the fixed release state detection limit switch 82 enters the off state. When the drive rack gear 6 further slides from the state of FIG. 3B, the lever portion 81a of the fixed state detection limit switch 81 is fitted into the recess 65 formed on the side surface of the drive rack gear 6, and the fixed state detection limit switch is 81 is turned off (see FIG. 3C). When the state of FIG. 3 (c) is a fixed state of the wheelchair I and both of the two detection means 8 are turned off, the control means C (see FIG. 1) to which the two detection means 8 are connected is fixed. The fact that the state has been reached is transmitted, and the driving means 7 such as an electric motor is turned off by the control means C to complete the fixing.

Similarly, when the unlocking instruction switch (not shown) provided in the vehicle is turned on from the state where the wheelchair I is fixed, the drive source 7 rotates in the reverse direction to the fixed time, and the drive rack gear 6 Is driven to the left side in FIG. 3 (c), and the drive source 7 is turned off by the control means C when moving from the state of FIG. 3 (c) to the state of FIG. Can be released.

The fixed state detection limit switch 81 and the fixed release state detection limit switch 82 shown in FIGS. 3A to 3C are merely examples, and the drive source 7 is turned off as the drive rack gear 6 moves. The positions and orientations of the fixed state detection limit switch 81 and the fixed release state detection limit switch 82 are not particularly limited as long as they can be configured. For example, as shown in FIGS. As shown, a protrusion 66 is provided on the side surface of the drive rack gear 6, and the drive rack gear 6 is driven to the left and right in FIGS. By alternately turning on and off the detection limit switch 82, the drive source 7 can be automatically turned off in the fixed state and the fixed state. Kill.

Next, the configuration of the drive rack gear 6 used in the wheelchair fixing device 1 of the present invention will be described with reference to FIG. 1, FIG. 5, and FIG.

As shown in FIGS. 1 and 5, the drive rack gear 6 includes a front drive

tooth row portion

61 and 62 that meshes with the front driven

gear

51 and 52, and a rear drive tooth row portion that meshes with the rear driven

gear

53 and 54. 63, 64. When the

hooks

21, 22, 23, 24 are hooked on the wheelchair I, the front drive teeth row

portions

61, 62, rear are arranged so that the front driven gears 51, 52 and the rear driven gears 53, 54 can freely rotate. No teeth are formed between the side

drive tooth rows

63 and 64. Further, in the vicinity of the end in the extending direction of the drive rack gear 6, a drive force transmission tooth row 67 (see FIG. 5) that meshes with a gear (not shown) on the drive source 7 side that transmits the power of the drive source 7 is formed. Has been. When the drive source 7 is driven, the gear on the drive source 7 side rotates, meshes with the drive force transmission tooth row 67 of the drive rack gear 6, and slides the drive rack gear 6. As shown in FIG. 5, a guide hole 6H is formed in the drive rack gear 6, and a guide projection G (see FIG. 1) inserted through the guide hole 6H guides the slide operation of the drive rack gear 6 into a linear motion. Is done.

As shown in FIG. 5, each of the

front drive teeth

61, 62 and the

rear drive teeth

63, 64 has one tooth end E1 and the other tooth end E2. Here, from the unlocked state of the wheelchair I (the state shown in FIG. 1), the end portion of the tooth row where the front driven gears 51 and 52 and the rear driven gears 53 and 54 first mesh is the other tooth row end portion E2. Yes, the other end of the dentition end E2 is the opposite end of one dentition end E1.

As shown in FIG. 5, the front drive

gear row portions

61 and 62 and the rear drive

gear row portions

63 and 64 are respectively connected to the front driven gear 51 and the fixed gear FP at a fixed distance FP away from one tooth row end E1. 52 and the rear driven gears 53 and 54 are configured so that the wheelchair I is fixed. The predetermined distance can hold the meshing of the front drive gears 61 and 62 and the rear drive gears 63 and 64 with the front driven gears 51 and 52 and the rear driven gears 53 and 54 at the fixed position FP. It is the distance of the dentition. The fixed position FP refers to the front drive teeth row

portions

61 and 62 and the rear sides that mesh with the front driven gears 51 and 52 and the rear driven gears 53 and 54 when the wheelchair I is fixed and the drive rack gear 6 is stopped. This refers to the position of the

drive teeth row

63, 64. At the fixed position FP, when the front drive gears 51 and 52 and the rear drive gears 53 and 54 are engaged with each other, the fixed state detection limit switch 81 is fitted into the recess 65 of the drive rack gear 6, and the control means. The driving source 7 is stopped by C.

As shown in FIGS. 5 and 6, the length of the dentition from the fixed position FP to the other dentition end E <b> 2 is longer than that of the

front drive dentition

61, 62. The front drive

tooth row portions

61 and 62 and the rear drive

tooth row portions

63 and 64 mesh with the front driven gears 51 and 52 and the rear driven gears 53 and 54, respectively, from the other tooth row end E2 side. . That is, as shown in FIG. 6 (for convenience of explanation, the front drive tooth row portion 61 and the rear drive tooth row portion 63 are arranged vertically), the other tooth from the fixed position FP in the rear drive tooth row portion 63. The length D1 of the dentition to the row end E2 is shorter than the length D2 of the dentition from the fixed position FP to the other row end E2 in the front drive dentition 61. Accordingly, as shown in FIGS. 7A and 7B, the

front drive teeth

61 and 62 are engaged with the front driven gears 51 and 52 before the

rear drive teeth

63 and 64, and the front drive. Length D2 of the dentition from the fixed position FP to the other dentition end E2 in the

dentition parts

61 and 62, and from the fixed position FP to the other dentition end E2 in the rear drive dentitions 63 and 64 Between the tooth row length D1 (D2−D1; see FIG. 6) (while the drive rack gear 6 slides from the state of FIG. 7A to the state of FIG. 7B) Only the

front traction members

31 and 32 are pulled, and the

rear traction members

33 and 34 are not pulled. Thereafter, the drive rack gear 6 is further slid from the state shown in FIG. 7 (b) to the state shown in FIG. 7 (c), so that the front drive

tooth row portions

61 and 62 and the rear drive tooth row portion 63 in the state shown in FIG. 7 (b). , 64 mesh with the drive rack gear 6, and the wheelchair I is pulled from the front and rear by both the

front traction members

31, 32 and the

rear traction members

33, 34. The wheelchair I is fixed in the state of FIG. 7C, the lever portion 81a of the limit switch 81 for detecting the fixed state is fitted into the recess 65 of the drive rack gear 6, and the drive source 7 is automatically stopped by the control means C. Fixing of wheelchair I is completed. In this way, the drive rack gear 6 and the front drive

tooth row portions

61 and 62 mesh with each other, pull only the

front traction members

31 and 32 by a predetermined amount, and pull the wheelchair I forward, then the drive rack gear 6 and the rear drive tooth row. By pulling both the

front traction members

31 and 32 and the

rear traction members

33 and 34 so that the

portions

63 and 64 mesh with each other, the drive source 7 such as a motor is restrained while maintaining the amount of movement of the drive rack gear 6. Since the detection means 8 can be actuated before the operation, even the wheelchair I that does not bend can be reliably fixed, and the durability of the motor can be ensured.

This point will be described in detail below. Between the state of FIG. 7 (a) and the state of FIG. 7 (b), the wheelchair I is not pulled from the front and rear sides of the

front traction members

31, 32 and the

rear traction members

33, 34 of the wheelchair I. Only the front side of the wheelchair I is pulled by the

front traction members

31 and 32. When the distance between the fixed position and the other tooth end where meshing starts is the same length in the front and rear teeth as in the conventional case, the front and rear driven gears mesh at the same time. When the wheelchair I is pulled from the front and back at the same time and the wheelchair I is not bent, such as the wheelchair I whose wheelchair I frame is highly rigid or the tire is punctured, the calculated rack gear movement amount (Predetermined amount) cannot be obtained.

That is, in the conventional wheelchair fixing device, the deflection of the wheelchair I frame that occurs when the hook is hooked and pulled from the front and back, and the deflection of the wheelchair I tire that occurs when it is pulled to the lifting platform F (collapse) ) Is calculated, and a predetermined amount of rack gear movement is determined so that the wheelchair I is securely fixed to the lifting platform F, and the electric motor is automatically stopped when the predetermined amount is reached. To the state where the limit switch is turned on or off. An electric motor having a driving force that can move the rack gear to a predetermined amount while winding the traction member with a reel is used. Therefore, in the case of the wheelchair I having high rigidity so that the wheelchair I does not bend, or the wheelchair I in which the tire is punctured or the tire is crushed by the weight of the occupant, the predetermined amount of movement of the rack gear is calculated. Because the frame gear of the wheelchair I and the movement of the rack gear corresponding to the deflection of the tire are eliminated, the cable is wound before reaching the distance until the preset limit switch is turned on or off. The force becomes larger than the driving force of the electric motor, the electric motor is restrained, and the rack gear cannot be moved. Then, since the limit switch is not turned on or off, the electric motor remains energized, and the durability of the motor is lowered.

On the other hand, as shown in FIGS. 6 and 7A to 7C, the length D1 of the dentition from the fixed position FP to the other dentition end E2 in the rear drive dentition 63 is the front drive. When the length D2 of the dentition from the fixed position FP to the other dentition end E2 in the dentition 61 is shorter than the

front dentition

61, 62, the front driven gears 51, 52 first mesh with each other. The side drive

tooth row portions

63 and 64 do not mesh with the rear side driven gears 53 and 54 (see FIG. 7A). Since only the front drive teeth row

portions

61 and 62 and the front driven gears 51 and 52 mesh with each other, the

rear traction members

33 and 34 do not receive a force to pull the wheelchair I, and the state shown in FIG. Until the state of (b), the wheelchair I moves forward by towing by the

front towing members

31 and 32. At this time, the drive rack gear 6 also slides, and then the

rear drive teeth

63 and 64 and the rear driven gears 53 and 54 mesh with each other, and the wheelchair I is pulled from both the front and rear to fix the wheelchair I. Therefore, even if the wheelchair I has high rigidity or the punctured wheelchair I, the arm portion 81a of the fixed state detection limit switch 81 is in the initial state by moving the wheelchair I forward as much as the wheelchair I is not bent. Therefore, the amount of movement of the drive rack gear 6 for fitting into the recess 65 can be ensured. Therefore, even the wheelchair I in which bending does not occur can be reliably fixed, and the durability of the drive source 7 such as a motor can be ensured.

In the above embodiment, as the drive mechanism DM, the front drive

tooth row portions

61 and 62 meshing with the front driven gears 51 and 52 and the rear drive

tooth row portions

63 and 64 meshing with the rear driven gears 53 and 54 are used. However, instead of the drive rack gear 6, a drive gear driven by the drive source 7 and meshed with the front driven gears 51 and 52 and the rear driven gears 53 and 54 may be used. Good. For example, without forming teeth on the entire circumference of the drive gear, a part of the tooth notch (a portion in which a portion that does not mesh with the front driven gears 51 and 52 and the rear driven gears 53 and 54 is formed to a predetermined length) The length of the toothed portion is changed between the front drive gear for towing the

front traction members

31 and 32 and the rear drive gear for towing the

rear traction members

33 and 34. Thus, after pulling only the front traction member by a predetermined amount, both the front traction member and the rear traction member can be pulled. In this case, when the drive gear rotates to a predetermined position by forming a recess in which the tip of the lever portion of the limit switch is fitted on the outer periphery of a disk-shaped member provided coaxially with the drive gear, the operation of the drive gear Can be stopped.

In the above embodiment, the limit switch is used as the detection means 8, but the detection means 8 may detect the movement of the drive mechanism optically and magnetically.

1

Wheelchair fixing device

21, 22, 23, 24

Hook

31, 32

Front traction member

33, 34 Rear traction member 41, 42

Front reel

43, 44

Rear reel

51, 52 Front driven

gear

53, 54 Rear driven gear 6 Drive rack gears 61, 62 Front

drive teeth row

63, 64 Rear drive teeth row 65 Recess 66 Projection 6H Guide hole 7 Drive source 8 Detection means 81 Fixed state detection limit switch 81a Lever portion 82 Fixed release state detection limit Switch C Control means DM Drive mechanism E1 One dentition end E2 Other dentition end F Lifting base FP Fixed position G Guide protrusion H1, H2, H3, H4 Opening I Wheelchair Ia, Ib Frame P Direction change member S Energizing means

Claims

A front traction member connected to the front side of the wheelchair via a hook provided at one end;
A rear traction member connected to the rear side of the wheelchair via a hook provided at one end;
A drive mechanism for pulling the front and rear traction members toward the floor;
Detecting means for detecting that a part of the drive mechanism has moved to a predetermined position;
Control means for stopping the operation of the drive mechanism from detection of the detection means,
The wheelchair fixing device, wherein the drive mechanism pulls both the front traction member and the front traction member after pulling only the front traction member by a predetermined amount.
The drive mechanism is
The other end of the front traction member is connected, and a front reel that winds up the front traction member;
A front driven gear that rotates integrally with the front reel;
The other end of the rear traction member is connected, and a rear reel that winds up the rear traction member;
A rear driven gear that rotates integrally with the rear reel;
A drive rack gear having a front drive tooth row portion meshing with the front driven gear and a rear drive tooth row portion meshing with the rear driven gear;
A drive source for driving the drive rack gear,
The front drive dentition and the rear drive dentition are fixed to the wheelchair by meshing with the front driven gear and the rear driven gear, respectively, at a fixed position away from one end of the dentition. Configured to be
The length of the dentition from the fixed position to the other dentition end is shorter in the rear drive dentition than in the front drive dentition,
2. The wheelchair according to claim 1, wherein the front drive dentition portion and the rear drive dentition portion mesh with the front driven gear and the rear driven gear from the other dentition end side, respectively. Fixing device.
The front traction member, the front reel, and the front driven gear are provided in pairs so that they can be connected to the front side of the wheelchair from different directions,
The rear traction member, the rear reel, and the rear driven gear are provided in pairs so that they can be connected to the rear side of the wheelchair from different directions. 2. The wheelchair fixing device according to 2.
4. The wheelchair fixing device according to claim 2, wherein the front driven gear and the rear driven gear are arranged in series parallel to a direction in which the drive rack gear extends.