JP6674618B2 - Wheelchair fixing device - Google Patents

Description

  The present invention relates to a wheelchair fixing device.

  Patent Documents 1 and 2 disclose a fixing device for fixing a wheelchair in a vehicle cabin. In Patent Literature 1, a wheelchair is fixed by connecting a frame of a wheelchair and a cabin floor with a plurality of belt members and securing members. In Patent Document 1, the length of a securing member can be adjusted by an automatic winding device.

  The fixing device disclosed in Patent Literature 2 includes a wheel guide that restricts lateral movement of a wheelchair, a fixed belt that passes through a belt guide provided on a vehicle cabin floor, and is hung over a wheelchair, and holds the fixed belt in a tensioned state. Belt tensioning means.

  However, in the above-described fixing device, the work of a person who connects the belt member, the fixing belt, and the like to the wheelchair is required, which is complicated and time-consuming.

JP 2002-209946 A JP 2000-116713 A

Therefore, there is a need for a wheelchair fixing device that automatically locks and locks a locked member provided at a specific portion of the wheelchair when the wheelchair is fixed to the cabin.
However, since the main wheel (tire) of the wheelchair is made of rubber or the like in order to improve the ride comfort, the height of the locked member changes depending on the weight of the person sitting on the wheelchair. There is a problem that is difficult to do.

  An object of the present invention is to provide a wheelchair fixing device that can be stably locked even if the height of a locked member provided on a wheelchair changes.

  In order to solve the above problems, a wheelchair fixing device according to the present invention has a base end pivotally supported in a vertical direction so that one of the vertical directions is a locking direction and the other is a disengagement direction. A wheelchair having a hook member having a hook portion for hooking a locked member of a wheelchair on the side of the locking direction side of the upper and lower sides when the stopping direction is set, and fixing the wheelchair by the hook member A fixing device, wherein the hook member has a sliding contact portion extending from a base end side to a distal end side, and slidably contacts the sliding contact portion so that the sliding contact position changes. Each time the swing angle of the hook member is changed, the lock member is biased so as to always press the hook member in the locking direction via the sliding contact portion.

Further, the hook member is formed with an elongated lock hole extending from a base end side to a distal end side, and the sliding contact portion may be a lower inner peripheral surface or an upper inner peripheral surface of the lock hole. Good.
The sliding contact portion has a concave curved surface, and is formed so that a tangent angle at a contact point between the lock member and the concave curved surface is constant even when a sliding contact position with the lock member is displaced. You may.

  Further, a plurality of combinations of the hook member and the lock member may be provided.

  ADVANTAGE OF THE INVENTION According to this invention, even if the height of the to-be-locked member provided in the wheelchair changes, there exists an effect which can be locked stably.

(A) is a top view of the wheelchair fixing device of one Embodiment, (b) is a side view of the wheelchair fixing device. The principal part perspective view of a wheelchair fixing device. The principal part top view of the wheelchair fixing device at the time of a wheelchair waiting state. The principal part top view of the wheelchair fixing device at the time of a wheelchair lock state. The principal part top view of the wheelchair fixing device at the time of lock release. FIG. 4 is a schematic explanatory view of a release lever in a wheelchair waiting state. The schematic explanatory drawing of the release lever at the time of a wheelchair lock state. FIG. 4 is a schematic explanatory view of a release lever when releasing a lock. The schematic explanatory drawing of the principal part of the wheelchair fixing device at the time of a wheelchair waiting state. The schematic explanatory drawing of the principal part of the wheelchair fixing device at the time of a wheelchair lock state. The schematic explanatory drawing of the principal part of the wheelchair fixing device at the time of lock release. FIG. 3 is an explanatory view of a main part of the wheelchair fixing device when the wheelchair is locked. Sectional drawing of a hook plate, an outer plate, and an inner plate. Explanatory drawing of the effect | action of a hook plate. Explanatory drawing of the lower inner peripheral surface of the lock hole. The schematic explanatory drawing of a wheelchair.

Hereinafter, a wheelchair fixing device 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 16.
The wheelchair 20 will be briefly described with reference to FIG. The wheelchair 20 includes a seat 22, a backrest 26, an armrest 28, and a step 30 on a frame 22 made of a metal pipe. The frame 22 is supported by a pair of main wheels 32 arranged on both left and right sides and an auxiliary wheel 34, and is free to run. The frame 22 is provided with a grip 36 used when the assistant pushes the wheelchair 20. In the present embodiment, an anchor bar 38 as a locked member is provided below the frame 22. The left and right ends of the metal anchor bar 38 are integrally connected to the lower part of the frame via the connecting portions 38a that stand up, and are provided in the width direction (left and right direction) of the wheelchair 20. The length of the anchor bar 38 in the left-right direction is longer than the distance between the hook plates 106 and 206 of the wheelchair fixing device 10 described later. In the present embodiment, the cross section of the anchor bar 38 is circular, but the shape of the cross section is not limited.

The main wheel 32 and the auxiliary wheel 34 are made of an air tire or a non-puncture tire and have elasticity.
Assuming that the height of the anchor bar 38 of the wheelchair 20 from the ground contact surface is h1, the height h1 is the weight of a person sitting on the wheelchair 20 or the weight of the main wheel 32 and the auxiliary wheel 34 when the main wheel 32 and the auxiliary wheel 34 are air tires. It varies according to the air pressure level.

<Wheelchair fixing device 10>
Next, the wheelchair fixing device 10 will be described.
As shown in FIG. 1A, the wheelchair fixing device 10 includes a pair of hook devices 100 and 200 arranged on the left and right sides, a pair of lock mechanisms 300 and 400 for locking the hook devices 100 and 200, and a lock. An operation unit 500 for performing an unlock operation on the lock mechanisms 300 and 400 in the state is provided, and a pair of interlock mechanisms 600 and 700 are provided.

As shown in FIG. 1A and FIGS. 3 to 5, the wheelchair fixing device 10 has a lock release unit 800 that releases the locked state of the hook devices 100 and 200.
<Hook device 100, 200>
As shown in FIGS. 1 (a), 1 (b), and 2, the hook devices 100 and 200 are mounted on the left and right sides of the vehicle with respect to an upper surface of a base plate 12 fixed to a vehicle cabin floor (not shown). Are spaced apart from each other in the direction, and are arranged along the front-back direction.

  The hook device 100 is sandwiched between the outer plate 102 and the inner plate 104 erected on the base plate 12 and the plates 102, 104, and the base end thereof swings vertically with respect to the front ends of the plates 102, 104. The hook plate 106 is movably supported by a shaft 108. The lowermost position of the hook plate 106 is the rotational position where the lower side abuts on the base plate 12. The hook plate 106 corresponds to a hook member.

  As shown in FIGS. 1B, 2, and 12, the lower portion of the rear end (that is, the front end) of the hook plate 106 has an inclined guide portion 110 such that the vertical width decreases toward the front end. Is provided. In addition, the hook plate 106 is recessed upward so that the hook portion 112 adjacent to the terminal end (front end) of the guide portion 110 can be locked to the anchor bar 38 of the wheelchair 20. That is, the guide portion 110 corresponds to a portion on the rear side (in the anti-penetration direction) of the hook portion 112. The state where the hook portion 112 is locked to the anchor bar 38 of the wheelchair 20 corresponds to the locked state. The downward direction in the rotation direction of the hook plate 106 corresponds to the locking direction, and the upward direction corresponds to the anti-locking direction.

  As shown in FIGS. 1 (b), 11 and 12, an elongated lock hole 114 is formed in the hook plate 106 from the front end (that is, the base end) to a substantially central portion in the rear direction. Have been. That is, the lock hole 114 extends from the base end side of the hook plate 106 toward the tip end side.

  Note that FIG. 12 shows a state in which the height h1 of the anchor bar 38 is equal to the length of the introduction portion 725 (see FIG. 9) of the engagement recess 723 when the lock piece 724 of the interlock member 720 described below is in contact with the base plate 12. When the height is higher than the height h, the locked state when the hook portion 112 is locked (locked) on the anchor bar 38 is shown. In this case, as shown in FIG. 12, the hook plate 106 is separated upward from the base plate 12 with which the lower side has been in contact.

  As shown in FIG. 12, the lock hole 114 has a lower inner peripheral surface 116 and an upper inner peripheral surface 117 extending in the front-rear direction. The lower inner peripheral surface 116 has a sliding contact portion 116a and a sliding contact portion formed with a vertical width (that is, a distance between the lower inner peripheral surface 116 and the upper inner peripheral surface 117) longer than a diameter of a lock bar 320 described later. And a recess 116b connected to the front end of the recess 116a.

  In addition, the sliding contact portion 116a has a concave curved surface having a constant radius of curvature such that as the hook portion 112 locks the anchor bar 38 of the wheelchair 20, the closer to the distal end, the higher the level is from the proximal end. Is formed. The concave curved surface allows a swing angle of the hook plate 106 to be changed each time a lock bar 320 having a circular cross section described later moves (that is, slides) in the front-rear direction and the sliding position changes. Is formed. The concave surface is formed such that the tangent angle α of the concave surface at the contact point of the lock bar 320 is constant even when the sliding position of the lock bar 320 with respect to the sliding portion 116a is displaced. FIG. 15 is an explanatory diagram of the tangent angle α. As shown in the drawing, the tangent angle α is a line L1 parallel to the moving direction of the lock bar 320 at a contact point P (contact point) between the sliding contact portion 116a and the lock bar 320, and a circular cross section at the contact point P. This is the angle between the lock bar 320 and the tangent L2. In FIG. 15, O1 indicates the center axis of the lock bar 320.

  When the lock bar 320 moves rearward and presses the sliding contact portion 116a, the swing angle of the hook plate 106 is reduced. When the lock bar 320 moves forward, the hook plate 106 presses the sliding contact portion 116a. Is released and the swing angle is allowed to increase. In the present embodiment, the swing angle is based on a state in which the lower portion of the hook plate 106 is in contact with the base plate 12, and from that state, when the hook plate 106 swings in the anti-locking direction. Angle.

  As shown in FIG. 1A, the outer plate 102 and the inner plate 104 are arranged in parallel with the hook plate 106, and are separated from the hook plate 106 by spacers 101a, 101b and the like penetrated by a shaft 108. Have been. As shown in FIGS. 12 and 13, through holes 118 and 120 are formed in the outer plate 102 and the inner plate 104, respectively. The through holes 118 and 120 are formed in a long hole shape extending rearward from the base end. The upper inner peripheral surfaces 118a, 120a of the through holes 118, 120 have the same height and are arranged horizontally, and the hook portions 112 of the hook plate 106 shown in FIG. In the stop state, the lock hole 114 is formed to be located below the upper inner peripheral surface 117.

  Further, as shown in FIG. 13, the lower inner peripheral surfaces 118b and 120b of the through holes 118 and 120 extend horizontally, and the lock holes are formed regardless of the position of the hook plate 106 shown in FIG. 114 is located below the lower inner peripheral surface 116. The length of the through holes 118 and 120 in the front-rear direction is set so as not to interfere with the reciprocating orbit of the lock bar 320 described later.

  As shown in FIGS. 2 and 12, a stopper surface 102a extending in the vertical direction is formed on the rear end surface of the outer plate 102. The lower portion of the stopper surface 102a is set at a position lower than the height h1 of the anchor bar 38. Note that the stopper surface 102a may be provided vertically, or may be provided obliquely so that it goes forward as it goes upward. Further, the shape may be an arc shape extending vertically. The stopper surface 102a contacts the anchor bar 38 of the wheelchair 20 that has entered from behind the wheelchair fixing device 10, and prevents the wheelchair 20 from moving forward.

  Each member constituting the hook device 200 is provided in a mirror-symmetrical (that is, left-right symmetric) shape with respect to a virtual vertical plane passing in the front-rear direction between the hook device 200 and the hook device 100. For this reason, members constituting the hook device 200, which correspond to members constituting the hook device 100, have the same reference numerals up to two digits among the reference numerals assigned to the members, and the third digit The detailed description is omitted by replacing the number 100 with the number 200.

  As shown in FIG. 1A and FIGS. 2 to 5, the hook device 200 includes the outer plate 202, the inner plate 204, and the hook plate 206 rotatably supported by the shaft 208 as described above. . The hook plate 206 corresponds to a hook member. As shown in FIG. 1A and FIGS. 3 to 5, the rear end surface of the outer plate 202 has a stopper surface 202a.

As shown in FIGS. 3 and 4, the outer plate 202 and the inner plate 204 have through holes 218 and 220.
As shown in FIGS. 9 to 11, the hook plate 206 has a lock hole 214 having a lower inner peripheral surface 216 and an upper inner peripheral surface 217, a guide portion 210, and a hook portion 212.

<Lock mechanism 300, 400>
Next, the lock mechanism 300 will be described.
As shown in FIGS. 2 to 4, the lock mechanism 300 is connected to a lock link 310, a lock bar 320 provided on the lock link 310, and the connection link 330 to the lock link 310. And a lock lever 340. The lock bar 320 corresponds to a lock member.

  The lock link portion 310 includes a main lock link 313 rotatably supported on a shaft 312 erected at a position close to the inner plate 204 side in the base plate 12 between the inner plates 104 and 204, and The auxiliary lock link 315 is rotatably supported by a shaft 314 with respect to the lock link 313. The main lock link 313 is urged in a counterclockwise direction by a torsion spring (not shown) as an urging member wound around the shaft 312.

  As shown in FIGS. 3 and 4, the shaft 314 is slidably disposed in a long hole 316 provided in the main lock link 313 along the longitudinal direction. In the sub lock link 315, a locking projection 317 protrudes from an end of the main lock link 313 toward the shaft 312.

  When the auxiliary lock link 315 is given a counterclockwise rotation by the connection link 330, the locking protrusion 317 moves the shaft 314 in the longitudinal direction within the range permitted by the elongated hole 316. The inside of the lock link 313 is formed obliquely so that it can be locked to a stopper pin 318 projecting upward from the upper surface.

  That is, as the shaft 314 moves in the long hole 316 toward the shaft 312 side, the slanted inner portion of the locking protrusion 317 comes into contact with the stopper pin 318, and the sub lock link 315 The rotation in the counterclockwise direction is promoted, and the main lock link 313 is rotated counterclockwise around the shaft 312.

  A lock bar 320 is integrally attached and fixed to an end (left end) of the auxiliary lock link 315 on the side opposite to the shaft 312. The lock bar 320 is inserted into the through holes 120, the lock holes 114, and the through holes 118 of the inner plate 104, the hook plate 106, and the outer plate 102, and has a free end protruding outside the outer plate 102.

  The lock bar 320 has a reciprocating trajectory that reciprocates in the front-rear direction along the horizontal line by reciprocating rotation of the lock link portion 310 around the shaft 312. Among the front-back directions in which the lock bar 320 moves, the rear direction corresponds to the locking direction, and the front direction corresponds to the unlocking direction.

  As described above, the sliding contact portion 116a of the lower inner peripheral surface 116 of the lock hole 114 is higher than the base end side as the hook portion 112 locks the anchor bar 38 of the wheelchair 20 toward the distal end side. The lock bar 320 is formed so as to have a concave curved surface so as to cross the reciprocating orbit of the lock bar 320.

  As shown in FIGS. 2 to 4, the lock lever 340 is located at a position closer to the inner plate 204 side of the base plate 12 between the inner plates 104 and 204, and a shaft 342 erected at the center in the front-rear direction. Is rotatably supported with respect to. As shown in FIG. 2, a torsion spring 344 as an urging portion is wound around the shaft 342, and always urges the lock lever 340 counterclockwise. Each end of the connection link 330 is connected to a tip of the lock lever 340 and a portion of the auxiliary lock link 315 between the shaft 314 and the lock bar 320.

  As shown in FIGS. 2 to 4, an engagement pin 346 is provided upright on the upper surface on the base end side of the lock lever 340. An engagement member 540 provided on the operation unit 500 described later is always engaged with the engagement pin 346, and the rotation position of the lock lever 340 can be selected according to the position of the engagement member 540. I have. The details of the engagement relationship between the engagement pin 346 and the lock lever 340 will be described later.

The lock mechanism 400 will be described.
As shown in FIGS. 1A, 3, and 4, the lock mechanism 400 includes a lock link portion 410, a lock bar 420 having a circular cross section provided on the lock link portion 410, and a lock link portion 410. A lock lever 440 (see FIG. 2) connected via a connection link 430 on the other hand. The lock bar 420 corresponds to a lock member. The lock link portion 410 includes, on the base plate 12 between the inner plates 104 and 204, a main lock link 413 rotatably supported on a shaft 412 erected at a position close to the inner plate 104 side; The auxiliary lock link 415 is supported by a shaft 414 so as to be rotatable with respect to the lock link 413. The main lock link 413 is urged clockwise by a torsion spring (not shown) as an urging member wound around the shaft 412.

  As shown in FIGS. 3 and 4, the shaft 414 is slidably disposed in a long hole 416 provided along the longitudinal direction of the main lock link 413. A locking projection 417 protrudes from an end of the auxiliary lock link 415 facing the shaft 412. When the auxiliary lock link 415 is given a clockwise rotation by the connecting link 430, the locking protrusion 417 moves the main lock in the longitudinal direction within a range permitted by the elongated hole 416. The inner portion is formed obliquely so as to be lockable with a stopper pin 418 projecting upward from the upper surface of the link 413.

  That is, as the shaft 414 moves in the elongated hole 416 toward the shaft 412 and the oblique inner portion of the locking protrusion 417 abuts on the stopper pin 418, the auxiliary lock link 415 The clockwise rotation is promoted, and the main lock link 413 is rotated clockwise around the shaft 412.

  A lock bar 420 is integrally fixed to an end (left end) of the auxiliary lock link 415 on the side opposite to the shaft 412. As shown in FIGS. 3 and 4, the lock bar 420 is inserted into the through holes 220, the lock holes 214, and the through holes 218 of the inner plate 204, the hook plate 206, and the outer plate 202, and has a free end outside the outer plate 202. It is projected to.

  The lock bar 420 has a reciprocating track that reciprocates in the front-rear direction along the horizontal line by reciprocating rotation of the lock link portion 410 around the shaft 412. Of the front and rear directions in which the lock bar 420 moves, the rear direction corresponds to the lock direction, and the front direction corresponds to the unlock direction. As shown in FIGS. 9 and 10, the lower inner peripheral surface 216 of the lock hole 214 is, as described above, in such a state that the hook portion 212 locks the anchor bar 38 of the wheelchair 20 toward the distal end. It is formed obliquely so as to go upward from the side, and is set to intersect the reciprocating orbit of the lock bar 420. As shown in FIG. 2, the lock lever 440 is rotatably supported so as to be located below the lock lever 340 with respect to the shaft 342.

  As shown in FIG. 2, a torsion spring (not shown) as an urging unit is wound around the shaft 342, and always urges the lock lever 440 counterclockwise. Each end of the connection link 430 is connected to a tip of the lock lever 440 and a portion of the auxiliary lock link 415 between the shaft 414 and the lock bar 420.

  On the upper surface of the lock lever 440, an engagement pin (not shown) is provided upright like the engagement pin 346 of the lock lever 340. An engagement member (not shown) provided on the operation unit 500 described below is always engaged with the engagement pin, and the rotation position of the lock lever 440 can be selected according to the position of the engagement member. ing.

<Operation unit 500>
As shown in FIGS. 1A and 2, the operation unit 500 includes an operation lever 510 and a pair of engagement members provided via a bracket 530 with respect to a distal end (that is, a front end) of the operation lever 510. And a joining member 540. In addition, as shown in FIG. 2, the pair of engaging members 540 are arranged apart from each other in the up-down direction and have the same shape, and in FIGS. Are hidden by the upper engaging member 540. The details of both engagement members 540 will be described later.

  The operation lever 510 has a front operation member 512 and a rear operation member 514 that is rotatably supported by the front operation member 512 so as to be rotatable upward. The front operation member 512 is mounted on a mounting plate 16 fixed to a mounting area 14 provided on the rear end side of the base plate 12. A hole 14a penetrating in the vertical direction is formed in the mounting area 14, and the mounting plate 16 is bolted to a mounting portion arranged on the periphery of the hole 14a.

  As shown in FIGS. 6 to 8, assuming a horizontal reference line O included in the virtual vertical plane passing through the center between the hook device 100 and the hook device 200, the mounting plate 16 Along the guide hole 16a, an engaging portion 16b is formed at the rear end of the guide hole 16a so as to be concave toward the right side. As shown in FIGS. 6 to 8, a fixed shaft 18 is provided upright on a portion of the mounting plate 16 located forward of the guide hole 16 a and on a horizontal reference line O.

  As shown in FIG. 2, the front operation member 512 is in a state where the fixed shaft 18 is irremovably inserted into a long guide hole 516 penetrating along the longitudinal direction (that is, the front-back direction). At the mounting area 14. Further, the front operation member 512 is slidable with respect to the fixed shaft 18 in the front-rear direction allowed by the guide hole 516 and is rotatable around the fixed shaft 18.

  As shown in FIGS. 1A and 2, a guide pin 518 is fixed to a portion of the front operation member 512 behind the guide hole 516. 6 to 8, the lower end of the guide pin 518 is slidably inserted into the guide hole 16a of the mounting plate 16 in the front-rear direction, and can be engaged and disengaged from the locking portion 16b. Is formed.

  As shown in FIG. 6, when the fixed shaft 18 is in contact with the front end of the guide hole 516, the front operation member 512 rotates the guide pin 518 about the fixed shaft 18 so that the guide pin 518 is turned into the guide hole. At the rear end position of 16a, it is possible to select between a state not engaged with the locking portion 16b and a state engaged with the locking portion 16b as shown in FIG.

  As shown in FIG. 6, below, the fixed shaft 18 is in contact with the front end of the guide hole 516, and the guide pin 518 is at the rear end position of the guide hole 16a. The position of the operation lever 510 in a state where it is not inserted is referred to as a “wheelchair waiting operation position”. As shown in FIG. 7, the position of the operation lever 510 in a state where the fixed shaft 18 is in contact with the front end of the guide hole 516 and the state where the guide pin 518 is engaged with the locking portion 16b will be described below. , The operation lever 510 is referred to as a “wheelchair lock operation position”.

  The operation lever 510 is located at the "wheelchair waiting operation position" shown in FIG. 6, the fixed shaft 18 abuts on the rear end of the guide hole 516 shown in FIG. 8, and the guide pin 518 is connected to the guide hole 16a. Can be changed to a state located on the front end side of.

  As shown in FIG. 8, the position of the operation lever 510 in a state where the fixed shaft 18 abuts on the rear end of the guide hole 516 and the guide pin 518 is located on the front end side of the guide hole 16a is hereinafter referred to as “ This is referred to as “unlock operation position”.

  As shown in FIGS. 1A and 2, between the front operation member 512 and the mounting area 14 of the base plate 12, an urging spring 522 for urging the front operation member 512 rearward, An urging spring 524 for urging in the direction is mounted. As shown in FIG. 6, when the operation lever 510 is located at the “wheelchair waiting operation position”, the guide pin 518 is locked to the rear end of the guide hole 16a by the biasing spring 522.

<Upper engaging member 540>
As shown in FIG. 2, the pair of engagement members 540 is supported by a front end of the front operation member 512 via a bracket 530 and extends forward.

  Of the pair of engaging members 540, the engaging member 540 arranged on the upper side will be described first. As shown in FIGS. 3 to 5, the front end side of the upper engagement member 540 has a first contact surface 542 that contacts the engagement pin 346 of the lock lever 340 and a rear side of the first contact surface 542. , A second contact surface 544 is provided.

  When the operation lever 510 is located at the "wheelchair waiting operation position" as shown in FIG. 6, the first contact surface 542 pushes the engagement pin 346 as shown in FIG. The biasing force of the torsion spring 344 is stored in the storage position.

  When the operation lever 510 is located at the “wheelchair lock operation position” as shown in FIG. 7, the torsion spring is held while the second contact surface 544 keeps contact with the engagement pin 346 as shown in FIG. The urging force at 344 is released to position the lock lever 340 at the urging force release position. As shown in FIG. 8, when the operation lever 510 moves from the “wheelchair lock operation position” to the “unlock operation position”, the engagement member 540 pushes the engagement pin 346 against the urging force of the torsion spring 344. , The lock lever 340 is rotated clockwise. During this movement, the contact portion with the engagement pin 346 changes from the second contact surface 544 to the first contact surface 542, and accumulates the urging force of the torsion spring 344 to accumulate the urging force of the lock lever 340. Position.

<Lower engagement member 540>
Similarly to the upper engaging member 540, an engaging pin (not shown) of a lock lever 440 (see FIG. 2) disposed below the lock lever 340 is provided on the front end side of the lower engaging member 540. It has a first contact surface and a second contact surface (both not shown) that come into contact with each other.

  When the operation lever 510 is located at the "wheelchair waiting operation position" as shown in FIG. 6, the first contact surface is pressed against an engagement pin (not shown) of the lock lever 440, and the lock lever 440 is pressed. At the urging force accumulating position to accumulate the urging force of a torsion spring (not shown) wound around the shaft 342.

  As shown in FIG. 7, when the operation lever 510 is located at the “wheelchair lock operation position”, the second contact surface keeps the contact state of the lock lever 440 with the engagement pin (not shown) while maintaining the shaft state. The urging force of the torsion spring (not shown) wound around 342 is released to position the lock lever 440 to the urging force release position.

  As shown in FIG. 8, when the operation lever 510 moves from the “wheelchair lock operation position” to the “unlock operation position”, it opposes the urging force of a torsion spring (not shown) wound around the shaft 342. The lower engagement member 540 causes the lock lever 440 to rotate clockwise through an engagement pin (not shown) of the lock lever 440.

  During this movement, the contact portion of the lock lever 440 with the engagement pin changes from the second contact surface to the first contact surface, and stores the urging force of a torsion spring (not shown) wound around the shaft 342. And the lock lever 440 is positioned at the urging force accumulating position.

The operation lever 510 and the upper and lower engagement members 540 constitute a lock permitting portion.
<Interlock mechanism 600, 700>
Next, the interlock mechanisms 600 and 700 will be described with reference to FIG. 1A, FIGS. 3 to 5, and FIGS. 9 to 11. The interlock mechanisms 600 and 700 are provided in mirror symmetry (that is, left-right symmetry) with respect to the virtual vertical plane. Here, the interlock mechanism 700 will be described, and as for the interlock mechanism 600, the members corresponding to the members constituting the interlock mechanism 700 are represented by two digits of the reference numerals assigned to the members of the interlock mechanism 700. The same reference numerals are used, and the 700th in the third digit is replaced with the 600th, thereby omitting the detailed description.

  The relationship between the interlock mechanism 700 and the hook device 200 will also be described below, but the relationship between the interlock mechanism 600 and the hook device 100 is the same as the relationship between the interlock mechanism 700 and the hook device 200. The description is omitted.

  As shown in FIGS. 1A and 2, the interlock mechanism 700 includes a lock plate 710 provided at a front end of a front operation member 512 and an interlock member provided to be freely engageable with the lock plate 710. 720.

  As shown in FIGS. 1A and 3, the lock plate 710 projects rightward from the front operation member 512 with respect to the right side rearward of the portion where the engagement member 540 is disposed. It is supported by. In the lock plate 710, an interlock hole 712 extending in the front-rear direction is vertically penetrated in a portion located below the interlock member 720.

  As shown in FIGS. 9 to 11, the interlock member 720 is rotatably supported by a shaft 711 on the inner surface of the rear end of the outer plate 202. As shown in FIGS. 2 and 9, the interlock member 720 is formed in a plate shape, and a lever piece 722 is provided on each of the upper and lower portions sandwiching the shaft 711, and a lock bulgingly formed on the rear side and the lower side. A piece 724 is provided. A substantially L-shaped engagement recess 723 is provided between the lever piece 722 and the lock piece 724, and the rear end of the inner surface extending rearward of the engagement recess 723 introduces the anchor bar 38 into the engagement recess 723. An introduction section 725 for guiding is provided.

  The interlock member 720 is urged by a torsion spring (not shown) wound around the shaft 711. With this bias, when the operation lever 510 is located at the “wheelchair waiting operation position”, the interlock member 720 causes the lock piece 724 to engage with the interlock hole 712 of the lock plate 710 located at the interlock position. It is arranged so as to be able to engage, and can be brought into contact with the base plate 12 (see FIG. 9). Here, the position where the interlock member 720 comes into contact with the base plate 12 with the lock piece 724 engaged with the interlock hole 712 of the lock plate 710 corresponds to an engagement position.

  In this state, the operation lever 510 is held so as to be located at the "wheelchair waiting operation position" shown in FIG. 6, so that the guide pin 518 is not engaged in the locking portion 16b. Note that the torsion spring 344 (not shown) wound around the shaft 711 may be omitted, and the locking piece 724 may be engaged with the interlock hole 712 by being dropped into the interlock hole 712 by its own weight.

  Thus, the state where the interlock member 720 is engaged in the interlock hole 712 is called an interlock state. A state in which the interlock member 720 is not engaged in the interlock hole 712 is referred to as an interlock release state.

  As shown in FIG. 9, when the interlock member 720 is located at the engagement position, the inner side surface extending rearward of the engagement recess 723 is substantially horizontal with the lock piece 724 in contact with the base plate 12. It is formed to be arranged. The height h of the interlock member 720 is set so that the introduction portion 725 can easily introduce the anchor bar 38 into the engagement recess 723. That is, the height h1 of the anchor bar 38 varies as described above, but is set to a value slightly lower than the minimum height of the variable range. Further, as shown in FIG. 9, when the lock piece 724 is in contact with the base plate 12, the lever piece 722 is arranged to extend upward.

  Further, the lever piece 722 is pressed by the anchor bar 38 before the engagement of the hook plate 206 with the hook portion 212 is started before the engagement with the hook portion 212, so that the locking piece 724 is interposed. It is arranged so as to be detached from the lock hole 712 (see FIG. 10).

  As shown in FIG. 10, when the anchor bar 38 is located in the engagement recess 723, the interlock member 720 is located at the non-engagement position, and the lock piece 724 is disengaged from the interlock hole 712. State is maintained. That is, the interlock mechanism 700 maintains the interlock release state.

  When the lock piece 724 is detached from the interlock hole 712 as shown in FIG. 10, the operation lever 510 is moved to the "wheelchair lock operation position" by the urging force of the urging spring 524 as shown in FIG. Then, this state is maintained. That is, this state is a wheelchair locked state of the wheelchair fixing device 10, and the anchor bar 38 is engaged with the hook portion 212 of the hook plate 206 and is disposed in the engagement recess 723 of the interlock member 720. .

  When the operation lever 510 is located at the “unlocking operation position” as shown in FIG. 8, the lock plate 710 is at a position where the lock piece 724 of the interlock member 720 abuts on the base plate 12 as shown in FIG. It is designed to move forward to a position that allows rotation up to this point. When the lock plate 710 moves to this position, the anchor bar 38 located in the engagement recess 723 can be detached rearward. Here, the position of the lock plate 710 where the lock plate 710 does not engage the lock piece 724 in the interlock hole 712 as shown in FIGS. 4 and 5 is referred to as a non-interlock position.

<Lock release unit 800>
Next, with reference to FIG. 1, FIG. 3 to FIG. 5, and FIG. 9 to FIG.

  As shown in FIGS. 1 and 3, in the hook plate 206, between the lock hole 214 and the hook portion 212, a pushed-up portion 810 facing the hook device 100 side is provided. In the present embodiment, the pushed upper portion 810 is a roller supported rotatably, but is not limited thereto, and may be, for example, a bar. Note that, also in the hook plate 106, the pushed upper portion 820 is provided toward the hook device 200 side so as to be coaxial with the pushed upper portion 810.

  As shown in FIGS. 1 to 5, a pair of right and left push-up members 840 and 850 are provided at the front end of the front operation member 512 via a bracket 830. The push-up members 840 and 850 are arranged obliquely so as to descend toward the front end, and are formed so as to be able to push up the pushed-up portions 820 and 810. Specifically, as shown in FIGS. 3 and 9, when the front operation member 512 (operation lever 510) is located at the “wheelchair waiting operation position”, the lifting members 840 and 850 are pushed up. 810 and 820 are arranged apart from each other.

  As shown in FIGS. 5 and 11, the push-up members 840 and 850 push up the pushed upper portions 820 and 810 when the front operation member 512 (operation lever 510) is located at the “unlocking operation position”. By rotating the hook plates 106 and 206 in the anti-locking direction, the anchor bar 38 engaged with the hook portions 112 and 212 can be released.

(Operation of the embodiment)
The operation of the wheelchair fixing device 10 configured as described above will be described.
<1. Waiting for wheelchair>
FIG. 3 shows a state where the hook devices 100 and 200 of the wheelchair fixing device 10 are in a wheelchair waiting state. In this state, the interlock member 620 and the interlock member 720 are positioned at the engagement position since the lock piece 624 and the lock piece 724 shown in FIG. 9 are engaged in the interlock holes 612 and 712, respectively. I have. Further, as shown in FIG. 6, the guide pin 518 of the front operation member 512 (operation lever 510) is prevented from engaging in the locking portion 16b.

<2. Wheelchair Lock>
The case where the wheelchair 20 is fixed by the wheelchair fixing device 10 is as follows.
In the waiting state of the wheelchair shown in FIG. 3, the wheelchair 20 is moved forward (entered) from behind the wheelchair fixing device 10 until the anchor bar 38 hits the stopper surfaces 102a and 202a. Here, the front direction of the wheelchair 20 corresponds to the invasion direction. The backward direction corresponds to the anti-penetration direction.

  At this time, the anchor bar 38 of the wheelchair 20 (see FIG. 16) that has moved (intruded) hits the guide portion 110 of the hook plate 106 (see FIG. 12) and the guide portion 210 of the hook plate 206 (see FIG. 10). By rotating the plates 106 and 206 upward, the plates 106 and 206 are engaged in the hook portions 112 and 212 and are locked.

Note that the hook plates 106 and 206 may contact the guide portions 110 and 210 with the anchor bar 38 at the same time, or may have a time difference.
The interlock members 620, 720 of the interlock mechanisms 600, 700 press the lever pieces 622, 722 against the urging force of a not-shown torsion spring before the anchor bar 38 is engaged with the hook portions 112, 212. As a result, the lock pieces 624, 724 are disengaged from the interlock holes 612, 712 and located at the non-engagement position.

  In the present embodiment, the interlock mechanisms 600 and 700 are independent of each other, but the interlock is not released unless the interlock members 620 and 720 of both interlock mechanisms are separated from the interlock holes 612 and 712. . For this reason, even if one of the interlock mechanisms 600 and 700 is in the interlock release state, the wheelchair lock is not completed as the whole wheelchair fixing device 10. On the other hand, when the lock pieces 624, 724 are both disengaged from the interlock holes 612, 712, the front operation member 512 (operation lever 510) is rotated around the fixed shaft 18 by the urging force of the urging spring 524 as shown in FIG. ) Rotates, and the guide pin 518 engages with the locking portion 16b. Thus, in the wheelchair waiting state, the pair of engagement members 540 that have pressed the engagement pins 346 and the like with the first contact surface 542 move as shown in FIG. Release the constraint.

  As a result, the lock levers 340 and 440 rotate counterclockwise until the engagement pins 346 and the like move to the second contact surface 544 and are brought into contact with each other by the urging force of the torsion spring 344 and the like wound around the shaft 342. Move.

  By the counterclockwise rotation of the lock levers 340, 440, the lock mechanisms 300, 400 move the lock bars 320, 420 via the connection links 330, 430 and the lock link portions 310, 410 from the state shown in FIG. , And move in the backward direction (lock direction).

  Here, a case where the connecting link 330 operates the lock link unit 310 will be described. By the rotation of the lock lever 340 in the counterclockwise direction, the auxiliary lock link 315 rotates in the counterclockwise direction via the connection link 330. As a result, the sub-lock link 315 moves counterclockwise as the shaft 314 moves in the elongated hole 316 toward the shaft 312 and the inner portion of the locking projection 317 contacts the stopper pin 318. Enhances the movement in the circumferential direction, causing the main lock link 313 to rotate counterclockwise about the axis 312.

  When the connecting link 430 activates the lock link unit 410, the rotation direction of each of the members constituting the lock link unit 410 is only opposite to that of the lock link unit 310, and a detailed description thereof will be omitted.

  As described above, the lock bars 320 and 420 are moved rearward (locking direction) by the lock bars 320 and 420 to lock the lock holes 114 of the hook plate 106 and the lock holes 214 of the hook plate 206 as shown in FIG. The sliding portions 116a and 216a are brought into sliding contact with each other to press the hook plate 106 and the hook plate 206 downward.

  The rearward movement (locking direction) of the lock bars 320, 420 is performed until the hook portions 112, 212 of the hook plates 106, 206 are completely engaged with the anchor bar 38.

  FIG. 10 shows a state in which the anchor bar 38 is completely engaged with the hook portion 212 of the hook plate 206 (wheelchair locked state). FIG. 12 shows a state in which the anchor bar 38 is completely engaged with the hook portion 112 of the hook plate 106. 2 shows the locked state (wheelchair locked state). In this wheelchair locked state, the torsion springs 344 wound around the shaft 342 apply tension to the lock bars 320 and 420 in the direction of the arrow as shown in FIG. Is held in engagement with the anchor bar 38.

  In FIG. 10, the lower side of the hook plate 206 is in contact with the base plate 12, whereas in FIG. 12, the lower side of the hook plate 106 is illustrated as being separated from the base plate 12. ing. This is because the hook plates 106 and 206 have the same size, but in FIG. 12, the height h1 of the anchor bar 38 is higher than the height of the anchor bar 38 shown in FIG. . The reason why the height h1 of the anchor bar 38 is different is that the weight and the like of the person sitting on the wheelchair 20 are different as described above, and therefore, the main wheel 32 of the wheelchair 20 is elastic according to the weight of the person. This is because it is deformed.

  Here, when the deformation of the pair of left and right main wheels 32 is the same, the hook plates 106 and 206 change their swing angles according to the height of the anchor bar 38, that is, follow the hook bars 112 and 212. Lock with. At this time, as shown in FIGS. 14 and 15, the lock bars 320 and 420 pressed by the lock bars 320 and 420 urged by the torsion spring 344 and the like slide in contact with the anchor bar 38 according to the height thereof. The sliding position with respect to the portions 116a and 216a changes. Even if the sliding position of the lock bars 320 and 420 with respect to the sliding portions 116a and 216a is displaced, the tangent angle α of the concave curved surface at the contact point (contact point P) of the lock bar 320 is constant. , 420 can stably lock and hold the anchor bar 38 with the same holding force.

  Even when the deformation of the pair of left and right main wheels 32 is different, even when the heights of the respective portions of the anchor bar 38 at which the hook portions 112 and 212 of the hook plates 106 and 206 are locked are different from each other. Each of the anchor bars 38 can be stably locked and held by the lock bars 320 and 420 with the same holding force.

<3. Unlock>
Next, a case where the wheelchair fixing device 10 is unlocked will be described.
As shown in FIG. 7, from the state where the operation lever 510 is located at the “wheelchair lock operation position”, the front operation member 512 (operation lever 510) is moved to the fixed shaft 18 against the urging force of the urging spring 524. Then, the guide pin 518 is rotated from the locking portion 16b in a clockwise direction. As shown in FIG. 8, thereafter, the operation lever 510 is moved to the “unlocked operation position” against the urging force of the urging spring 522 and the torsion spring 344 wound around the shaft 342.

  By this operation, as shown in FIG. 5, the operation lever 510 moves forward, and the pair of engagement members 540 positions the lock levers 340 and 440 at the urging force accumulating position via the engagement pins 346. .

  This rotation of the lock levers 340, 440 causes the lock bars 320, 420 to operate in the forward direction (unlock direction) via the connection links 330, 430. Movement of the lock bars 320, 420 in the unlocking direction releases the downward restraint of the hook plates 106, 206. At the same time, as shown in FIG. 5 and FIG. 10, the front operation member 512 (operation lever 510) moves forward to the “unlocked operation position”, so that the lifting members 840, 850 cause the hook plates 106, 206 to move. The pushed upper parts 820 and 810 are pushed up. As a result, the anchor bar 38 engaged with the hook portions 112, 212 of the hook plates 106, 206 is released. In this state, the wheelchair 20 is removed from the wheelchair fixing device 10 by moving the wheelchair 20 backward.

  Here, when the anchor bar 38 of the wheelchair 20 is detached from the wheelchair fixing device 10, the operation lever 510 is located at the "unlocking operation position" shown in FIG. For this reason, as shown in FIG. 11, the interlock members 620 and 720 are fixed to the base plate 12 on the rear side of the lock plate 710 by the bias of a torsion spring (not shown) wound around the shafts 611 and 711. Abuts.

  Thereafter, when the front operation member 512 (operation lever 510) is moved back to the "wheelchair waiting operation position" shown in FIG. 9, the interlock holes 612, 712 are engaged with the lock pieces 624, 724. Return to a possible position. Accordingly, the lock pieces 624, 724 of the interlock members 620, 720 are engaged with the interlock holes 612, 712 of the lock plates 610, 710 by the urging of a torsion spring (not shown) wound around the shafts 611, 711. I do. In this way, the wheelchair fixing device 10 returns to the wheelchair waiting state when the hook devices 100 and 200 are unlocked.

This embodiment has the following features.
(1) The wheelchair fixing device 10 has its base end pivotally supported in the vertical direction so that it can swing upward and downward. Of these, hook plates 106 and 206 (hook members) having hook portions 112 and 212 for hooking the anchor bar 38 (locked member) of the wheelchair are provided on the lower side in the locking direction. In the hook plates 106 and 206, sliding contact portions 116a and 216a are provided on a part of lower inner peripheral surfaces 116 and 216 of lock holes 114 and 214 extending from the base end side to the distal end side. The wheelchair fixing device 10 includes lock bars 320 and 420 (lock members). The lock bars 320 and 420 (lock members) slidably contact the sliding portions 116a and 216a of the lock holes 114 and 214, and each time the sliding position changes, the swing angle of the hook plates 106 and 206 changes. , And are constantly urged to press the hook plates 106, 206 (hook members) in the locking direction via the sliding portions 116a, 216a. As a result, even when the height of the locked member provided on the wheelchair changes, the hook plates 106 and 206 follow and change the swing angle, so that the locking can be performed stably.

  (2) In the wheelchair fixing device 10 according to the present embodiment, elongated lock holes 114 and 214 are formed in the hook plates 106 and 206 (hook members) extending from the base end to the distal end. Further, the sliding portions 116a and 216a are provided on the lower inner peripheral surface 116 of the lock holes 114 and 214.

As a result, even when the sliding portion is a part of the lower inner peripheral surfaces of the lock holes 114 and 214 of the hook plates 106 and 206, the effect (1) can be easily realized.
(3) The sliding portions 116a and 216a of the present embodiment have a concave curved surface, and the tangent angle α to the concave curved surface is constant even when the sliding position of the lock bars 320 and 420 (lock member) is displaced. Is formed. As a result, even if the heights of the anchor bars 38 are different, the lock bars 320 and 420 (lock members) can stably lock and hold the anchor bars 38 (locked members) with the same holding force.

  (4) In the present embodiment, a combination of a hook plate as a hook member and a lock bar as a lock member is provided. As a result, the wheelchair can be stably locked even if the portions of the anchor bar as the locked members have different heights.

The embodiment of the present invention is not limited to the above embodiment, and may be modified as described below.
In the above-described embodiment, the interlock holes 612 and 712 are provided in the lock plates 610 and 710, and the lock pieces 624 and 724 are provided in the interlock members 620 and 720. However, the relationship may be reversed. That is, an interlock hole may be provided in the interlock member 720, and a lock piece may be provided in the lock plate 710 so as to be able to be engaged in the interlock hole.

  In the above-described embodiment, the number of hook devices is two. However, the number of hook devices is not limited to two. A single device may be provided, or three or more devices may be provided. When three or more hook devices are provided, a lock mechanism is provided so as to correspond to each hook device.

When a plurality of hook devices are provided, the wheelchair can be fixed in a stable state by fixing and locking the wheelchair with the plurality of hook devices.
When a plurality of hook devices are provided, they may be arranged shifted in the front-rear direction. In this case, a plurality of anchor bars 38 are arranged on the wheelchair 20 so as to be locked by each hook device, or, in the case of a single anchor bar, have a portion to be locked to each hook device. The shape of the anchor bar may be changed as described above.

  In addition, in the above embodiment, the reciprocating track of the lock bar 320 reciprocates in the front-rear direction along the horizontal line. However, the reciprocating track is not necessarily limited to the horizontal line. For example, it may be in the front-rear direction and inclined with respect to the horizontal line. In this case, the lower inner peripheral surface of the lock hole of the hook plate may extend in the front-rear direction and in the direction intersecting with the reciprocating track.

  In the embodiment, the upper inner peripheral surfaces 118a, 120a of the through holes 118, 120 have the same height and are arranged horizontally, but the invention is not limited to the horizontal. When the hook portion 112 of the hook plate 106 shown in FIG. 12 locks the anchor bar 38, the hook portion 112 may be formed obliquely so as to be located below the upper inner peripheral surface 117 of the lock hole 114.

In the above embodiment, the inner plates 104 and 204 may be omitted.
Further, in the above embodiment, the outer plate 102 may be replaced at the installation position of the inner plate 104, and the outer plate 202 may be replaced at the installation position of the inner plate 204. In this case, the outer plate replaced at the installation position of the inner plates 104 and 204 becomes a new inner plate, and this new inner plate has a stopper surface.

  In the above-described embodiment, the wheelchair fixing device 10 is arranged on the floor of the passenger compartment such that the wheelchair 20 fixed to the wheelchair fixing device 10 is moved in the forward direction of the vehicle and the rear is in the anti-penetration direction. It is not limited to. The wheelchair fixing device 10 may be installed in the vehicle with one direction as the invasion direction and the opposite direction as the anti-invasion direction based on the vehicle.

  For example, the invasion direction may be the rear direction and the anti-invasion direction may be the front direction. Further, the wheelchair fixing device 10 may be arranged on the floor of the passenger compartment such that the movement of the wheelchair 20 fixed to the wheelchair fixing device 10 to the right of the vehicle is set as the invasion direction and the left side is set as the anti-invasion direction. Conversely, the wheelchair fixing device 10 is arranged on the floor of the passenger compartment such that the movement of the wheelchair 20 fixed to the wheelchair fixing device 10 to the left of the vehicle is set as the invasion direction and the right side is set as the anti-invasion direction. Is also good.

  In the above-described embodiment, the lock holes are formed as long holes. However, the upper holes of the lock holes 114 and 214 of the outer plates 102 and 202 may be opened. In this case, for example, the upper inner peripheral surface 120a of the through hole 120 of the inner plate 104 and the upper inner peripheral surface of the through hole 220 are formed in the same manner as in the above embodiment.

  In the above-described embodiment, the locking direction is set to the downward direction, and the anti-locking direction is set to the upward direction. However, the present invention is not limited to the directions exemplified in this embodiment. For example, the locking direction may be upward and the anti-locking direction may be downward. When the locking direction is set to the upper direction, the upper inner peripheral surfaces 117 and 217 of the lock holes 114 and 214 correspond to the sliding contact portions.

  In the above-described embodiment, the lock bars 320 and 420 are reciprocated via the link. However, the lock bars 320 and 420 may be provided on a slider that is movably supported in the front-rear direction. Then, a biasing member, for example, a spring or the like is hung on the slider, and the biasing member constantly presses the sliding contact portion via the lock bars 320, 420, for example, in the above-described embodiment. , It may be configured to move rearward.

  In the above embodiment, the sliding contact portion has a concave curved surface so as to have a constant radius of curvature. However, the sliding contact portion may be formed obliquely. Alternatively, the sliding contact portion may be formed by connecting portions having different radii of curvature.

  Further, in the above-described embodiment, the lock bar that is in sliding contact with the sliding contact portion has a circular cross section. However, only the portion that contacts the sliding contact portion may be formed in an arcuate cross section.

10: Wheelchair fixing device, 12: Base plate, 14: Mounting area, 14a: Hole,
16: mounting plate, 16a: guide hole, 16b: locking portion, 18: fixed shaft,
20 ... wheelchair, 22 ... frame, 24 ... seating part, 26 ... backrest,
28 ... armrest, 30 ... step, 32 ... main wheel, 34 ... auxiliary wheel,
36 ... grip, 38 ... anchor bar (locked member), 38a ... connecting part,
100: hook device, 102: outer plate, 102a: stopper surface,
104: inner plate, 106: hook plate (hook member),
108 ... shaft, 110 ... guide part, 112 ... hook part,
114: lock hole; 116: lower inner peripheral surface of lock hole 114;
116a: sliding contact portion, 116b: concave portion, 117: upper inner peripheral surface of lock hole 114, 118: through hole of outer plate 102,
118a: upper inner peripheral surface, 120: through hole of the inner plate 104,
120a: Upper inner peripheral surface, 130: Pushed upper part, 200: Hook device,
202: outer plate, 202a: stopper surface,
204: inner plate, 206: hook plate (hook member),
208: shaft, 210: guide portion, 212: hook portion,
214: lock hole, 216: lower inner peripheral surface of lock hole 214,
216a: sliding contact portion, 216b: concave portion,
217: Upper inner peripheral surface of lock hole 214,
218: through hole of outer plate 202,
220 ... through hole of the inner plate 204,
230: pushed upper part, 300: lock mechanism, 310: lock link part,
312 ... shaft, 313 ... main lock link, 314 ... shaft,
315: auxiliary lock link, 316: long hole, 317: locking projection,
318: stopper pin, 320: lock bar (lock member),
330: connecting link, 340: lock lever, 342: shaft,
344: torsion spring, 346: engagement pin, 400: lock mechanism,
410: lock link portion, 412: shaft, 413: main lock link,
414: shaft, 415: auxiliary lock link, 416: long hole, 417: locking projection,
418: stopper pin, 420: lock bar (lock member),
430: connecting link, 440: lock lever,
500 operation unit, 510 operation lever, 512 front operation member,
514: rear operation member, 516: guide hole, 518: guide pin,
522, 524: biasing spring, 530: bracket,
540 ... engaging member (constituting a lock permitting part together with operation lever 510)
542: first contact surface, 544: second contact surface,
550: bracket, 600: interlock mechanism,
610: lock plate, 611: shaft, 612: interlock hole,
620: Interlock member, 622: Lever piece, 624: Lock piece,
700: interlock mechanism, 710: lock plate, 711: shaft,
712: interlock hole, 720: interlock member,
722: lever piece, 723: engagement recess, 724: lock piece,
725: introduction part, 800: lock release part, 810, 820: pushed upper part,
830: bracket, 840, 850: push-up member,
h: height of the introduction portion 725 of the engagement recess 723;
h1: height of the anchor bar 38 of the wheelchair 20, O: reference line, O1: central axis,
L1: a line parallel to the moving direction of the lock bar 320, L2: tangent, α: tangent angle.

Claims (4)

When the base end is pivotally supported in the vertical direction and one of the vertical directions is the locking direction and the other is the anti-locking direction, the locking direction side of the upper and lower sides is A wheelchair fixing device comprising a hook member having a hook portion for hooking a locked member of a wheelchair on a side portion, and fixing the wheelchair by the hook member,
The hook member has a sliding contact portion extending from the base end side to the tip end side,
The slidable contact is made slidably with respect to the sliding contact portion, the swing angle of the hook member is changed each time the sliding contact position is changed, and the hook member is always held in the locking direction via the sliding contact portion. A wheelchair fixing device having a lock member biased so as to press the wheelchair. An elongated lock hole extending from the base end side to the distal end side is formed in the hook member,
The wheelchair fixing device according to claim 1, wherein the sliding contact portion is a lower inner peripheral surface or an upper inner peripheral surface of the lock hole. The sliding contact portion has a concave curved surface,
3. The wheelchair fixing according to claim 1, wherein a tangent angle at a contact point between the lock member and the concave curved surface is constant even when a sliding contact position with the lock member is displaced. apparatus.   The wheelchair fixing device according to any one of claims 1 to 3, further comprising a plurality of combinations of the hook member and the lock member.

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