JP6686918B2 - Wheelchair fixing device - Google Patents

Description

  The present invention relates to a wheelchair fixing device.

  Patent Documents 1 and 2 are known as a fixing device for fixing a wheelchair that has entered a passenger compartment. In Patent Document 1, the frame of the wheelchair and the passenger compartment floor are connected by a plurality of belt members and lashing members to fix the wheelchair. Further, in Patent Document 1, the length of the lashing member can be adjusted by an automatic winding device.

  The fixing device of Patent Literature 2 holds a wheel guide that restricts lateral movement of a wheelchair, a fixing belt that passes through a belt guide provided on a vehicle compartment floor, and is hung on the wheelchair, and a tension state of the fixing belt. A belt tensioning means is provided.

JP-A-2002-209946 JP 2000-116713 A

  By the way, in the said fixing device, the work of a person who connects and locks a belt member, a fixed belt, etc. to a wheelchair, and releases connection (namely, lock release) is required, and it is complicated and time-consuming.

  An object of the present invention is to provide a wheelchair fixing device that has a simple structure and can easily lock and unlock a locked member provided in a wheelchair.

  In order to solve the above-mentioned problems, the present invention has an engaging recessed portion provided at a tip end thereof so that a locked member of a wheelchair can be engaged therein, and a base end thereof is provided in an engaging direction and an anti-engaging direction. A hook member that is swingably supported, and has a hook member having a lock hole provided with an extended sliding contact surface between the base end and the engaging recess, and a linear reciprocating track. A lock member that is provided so as to be movable and that is constantly biased to press and slide the sliding contact surface so that the hook member is swingable in the engaging direction; and the sliding contact surface. A crossing angle changing portion for changing a crossing angle of a straight line reciprocating track of the lock member with respect to a sliding tangent line along the sliding contact line, the wheelchair engaged with the engaging concave portion of the hook member according to the change of the crossing angle. Locked state that locks the state where the stop member is engaged, And has a crossing angle changing unit which performs transition removal state.

  Further, the crossing angle changing portion is rocked by pressing the locked member at the time of entry, and rocks a lever member biased to the side opposite to the pressing direction of the locked member. The operation member that supports the operation member and the base end that is swingably connected to the operation member and that has a tip that extends toward the base end side of the hook member and that swings the lever member. A rocking member that rocks in cooperation with the rocking member, and a linear moving member that is provided on the rocking member and that forms a linear reciprocating track by supporting the lock member. The rocking member is located at the unlock rocking position by the lever member biased to the side opposite to the pressing direction of the locked member after the pressing of the lever member by the locking member is released. The crossing angle is determined by the lock member and the sliding contact surface. The lock angle is set to an unlocking angle that cannot be locked by the static friction force between the rocking members. In the locked state, the rocking member is locked and rocked by the rocking of the lever member by the pressing of the locked member. At the position, the intersecting angle may be a lock angle (<unlock angle) for locking by the static frictional force between the lock member and the sliding contact surface.

  Further, the operating portion is operably arranged so as to become closer to the base end of the hook member in the order of the first operating position, the second operating position, and the third operating position, The lever member and the swinging member are swingable in the waiting state when the operating portion is located at the first operating position and the lever member is not in contact with the locked member of the wheelchair. As a result, the intersection angle becomes an unlock angle, and the intersection angle changing portion is locked by pressing the locked member in a state where the operation portion is located at the first operation position, and is brought to the second operation position. When the operating portion is located, the lock is released, and when the operating portion is located at the third operating position, the lock member presses the surface of the lock hole opposite to the sliding contact surface. The engagement with the locked member The engagement parts may be made a hook released state to be released.

  According to the present invention, it is possible to easily lock and unlock the locked member provided on the wheelchair with a simple configuration.

(A) is a top view of the wheelchair fixing device of one embodiment, (b) is a side view of the wheelchair fixing device of one embodiment. (A) is a perspective view of the wheelchair fixing device of one embodiment, (b) is a sectional view of the connecting shaft 516. The exploded perspective view of the wheelchair fixing device of one embodiment. Explanatory drawing of a main part of a wheelchair fixing device in a waiting state. The principal part explanatory view of the lock state of a wheelchair fixing device. Explanatory drawing of a main part of a wheelchair fixing device in an unlocked state. Explanatory drawing of a main part of a wheelchair fixing device in a hook released state. Explanatory drawing which shows the force which acts on a lock bar etc. in the lock state of a wheelchair fixing device, and the moving direction of a lock bar. The schematic explanatory drawing of a wheelchair.

1 to 9, one embodiment of the wheelchair fixing device of the present invention will be described below.
The wheelchair 20 will be briefly described with reference to FIG. 9. The wheelchair 20 is provided with a seat portion 24, 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 freely movable. The frame 22 is provided with a grip 36 used when an assistant pushes the wheelchair 20. In the present embodiment, an anchor bar 38 as a locked member is provided on the lower portion of the frame 22. The metal anchor bar 38 is integrally connected to the lower part of the frame via connecting parts 38a that are raised at the left and right ends, and is provided across 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, which will be described later.

<Wheelchair fixing device 10>
The wheelchair fixing device 10 will be described with reference to FIG. The wheelchair fixing device 10 is provided with respect to the pair of hook devices 100 and 200 arranged on the left and right, the pair of locking mechanisms 300 and 400 for locking the hook devices 100 and 200, and the locking mechanisms 300 and 400 in the locked state. An operation unit 500 that performs an unlock operation and an interlock mechanism 600 that prevents the locked state from easily becoming the unlocked state are provided.

<Hook device 100, 200>
As shown in FIGS. 1 (a), 1 (b), and 2 (a), the hook devices 100 and 200 are mounted on an upper surface of a base plate 12 fixed to a vehicle compartment floor of a vehicle (not shown). They are spaced apart from each other in the left-right direction of the vehicle and arranged along the front-rear direction.

  The hook device 100 is sandwiched between an outer plate 102 and an inner plate 104, which are erected on the base plate 12, and both plates 102, 104, and is swingably mounted on a shaft 108 with respect to the front ends of the both plates 102, 104. And a hook plate 106 supported by the hook plate 106.

  As shown in FIGS. 2A and 3, a lower portion of the rear end (that is, the front end) of the hook plate 106 is provided with an oblique guide portion 110 such that the vertical width becomes narrower toward the front end side. . Further, the hook plate 106 is provided with an engaging recess 112 adjacent to the end (front end) of the guide portion 110, which is recessed upward so as to be able to be locked to the anchor bar 38 of the wheelchair 20. In the swinging direction of the hook plate 106, the downward direction corresponds to the engaging direction and the upward direction corresponds to the anti-engaging direction. The hook plate 106 corresponds to a hook member.

  As shown in FIGS. 2A and 4, the hook plate 106 is formed with an elongated lock hole 114 penetrating from the front end (that is, the base end) to the substantially central portion in the rear direction. . As shown in FIGS. 4 to 7, the lock hole 114 has a lower inner peripheral surface 116 and an upper inner peripheral surface 117 extending in the front-rear direction, and has a vertical width (that is, a width) that is larger than a diameter of a lock bar 330 described later. The distance between the lower inner peripheral surface 116 and the upper inner peripheral surface 117) is formed long. Further, the lower inner peripheral surface 116 of the lock hole 114 is inclined so that the lower the inner peripheral surface 116 of the lock hole 114, the closer it is to the tip side, the higher the base end side is when the anchor bar 38 of the wheelchair 20 is engaged. Has been formed. The lower inner peripheral surface 116 corresponds to a sliding contact surface.

As shown in FIG. 1A, the outer plate 102 and the inner plate 104 are arranged in parallel with the hook plate 106.
As shown in FIG. 3, 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 through holes 118 and 120 are set to a size that allows the lock bar 330, which will be described later, to move.

  As shown in FIGS. 2A and 3, a stopper surface 102a extending in the vertical direction is formed on the rear end surface of the outer plate 102. The lower part of the stopper surface 102a is set at a position lower than the height h1 of the anchor bar 38. In addition, the stopper surface 102a may be provided vertically, or may be provided in an oblique shape so that the stopper surface 102a faces forward as it goes upward. Further, it may be arcuate so as to extend in the vertical direction.

The stopper surface 102a contacts the anchor bar 38 of the wheelchair 20 that has entered from the rear of the wheelchair fixing device 10 to prevent the wheelchair 20 from moving forward.
Each member constituting the hook device 200 is provided in a mirror-symmetrical shape (that is, a bilaterally symmetric shape) with respect to an imaginary vertical plane that passes between the hook device 200 and the hook device 100 in the front-rear direction. For this reason, the members constituting the hook device 200, which correspond to the 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. By replacing No. 100 with No. 200, detailed description thereof will be omitted.

  As shown in FIGS. 1A, 2A, and 3, 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. I have it. The hook plate 206 corresponds to a hook member. As shown in FIG. 1B, the outer plate 202 has a stopper surface 202a on the rear end surface thereof. In FIG. 1B and FIGS. 4 to 7, K indicates the front and rear positions of the stopper surfaces 102a and 202a. As shown in FIGS. 1A and 3, the outer plate 202 and the inner plate 204 have through holes 218 and 220.

  Further, 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 an engaging concave portion 212. The lower inner peripheral surface 216 corresponds to a sliding contact surface.

<Lock mechanism 300, 400>
Next, the lock mechanism 300 will be described.
As shown in FIGS. 1A, 2A, and 3, the operation lever base 502 is mounted on the base plate 12 in a region between the hook device 100 and the hook device 200 so as to be movable in the front-rear direction. Has been done. The operation lever base 502 corresponds to a support member.

  A pair of bearing pieces 504 is provided on both left and right ends of the operation lever base 502 so as to project upward. A flat plate-shaped mechanism base 250 is swingably connected to the pair of bearing pieces 504. Specifically, a pair of bearing pieces 252 are provided upright on the left and right ends of the rear end (that is, the base end) of the mechanism base 250, and the bearing pieces 504 of the operation lever base 502 are superposed on each other. In this state, the swing shafts 254 are swingably connected to the operation lever base 502. The mechanism base 250 is constantly biased by a torsion spring 256 wound around a swing shaft 254 so that its front end (that is, tip) swings upward. The mechanism base 250 corresponds to a swing member. The front end (tip) of the mechanism base 250 extends toward the base ends of the hook plates 106 and 206 that are hook members.

  The lock mechanism 300 is provided on the mechanism base 250 and extends in the front-rear direction, and a guide that is linearly slid in the front-rear direction with respect to the guide rail 310 and is attached so as not to come out upward. It is composed of a block 320 and a lock bar 330 fixed to the upper surface of the guide block 320. The guide block 320 corresponds to a linear movement member. The guide rail 310 is fixed to the upper surface of the mechanism base 250 at a position closer to the hook device 100 side than the center between the hook devices 100 and 200. The lock bar 330 extends horizontally to the right, and its tip projects outward (to the right) from the hook device 100 through the through hole 120, the lock hole 114, and the through hole 120 of the hook device 100. Are arranged.

  As shown in FIG. 3, the guide block 320 is biased by the biasing spring 322 that is latched to the mechanism base 250 and is moved to the rear end side of the mechanism base 250. The lock bar 330 has a linear reciprocating track that reciprocates in the front-rear direction when the guide block 320 slides on the guide rail 310 in the front-rear direction.

  As described above, the lower inner peripheral surface 116 of the lock hole 114 is configured such that the engaging recess 112 locks the anchor bar 38 of the wheelchair 20 so that the lower the inner peripheral surface 116 of the lock hole 114, the closer it goes to the distal end side, the higher it goes to the base end side. It is formed in an oblique shape and is set so as to intersect the reciprocating track of the lock bar 330.

  As shown in FIGS. 2A and 3, in the mechanism base 250, a guide hole 260 is formed to extend in the front-rear direction at a center portion in the left-right direction, and the guide hole 260 has an upper surface of the base plate 12 in the guide hole 260. A guide pin 19 protruding from is inserted. The guide pin 19 guides the mechanism base 250 in the front-rear direction through the guide hole 260 when the mechanism base 250 is operated in the front-rear direction. The guide hole 260 has a length in the front-rear direction that allows the release levers 510 and 502 to be located at the later-described operation positions (that is, the first to third operation positions).

The lock mechanism 400 will be described.
Each member that constitutes the lock mechanism 400 is provided in a mirror-symmetrical shape (that is, a bilaterally symmetrical shape) with respect to an imaginary vertical plane that passes between the lock mechanism 300 and the lock mechanism 400 in the front-rear direction. The members constituting the lock mechanism 400, which correspond to the members constituting the lock mechanism 300, have the same reference numerals up to two digits among the reference numerals assigned to the members, and the third digit number 300. A detailed description will be omitted by substituting the number 400.

  From the above, the lock mechanism 400 includes the guide rail 410 provided on the mechanism base 250 and extending in the front-rear direction, the guide block 420 that linearly slides on the guide rail 410 in the front-rear direction, and the lock bar. A lock bar 430 fixed to the upper surface of 430. The guide block 420 corresponds to a linear movement member.

  Further, from the above, the lock bar 430 has a linear reciprocating track that reciprocates in the front-rear direction when the guide block 420 slides on the guide rail 410 in the front-rear direction. The lower inner peripheral surface 216 of the lock hole 214 of the hook plate 206 is inclined so that the engagement recess 212 holds the anchor bar 38 of the wheelchair 20 in the locked state, and as it goes to the distal end side, it goes upward from the base end side. And intersects the reciprocating track of the lock bar 430. Further, the guide block 420 is biased by the biasing spring 422, which is latched to the mechanism base 250, to move toward the rear end side of the mechanism base 250.

  In the present embodiment, the guide rail 310 and the guide rail 410 are arranged parallel to each other, but the guide rails 320 and 420 are not necessarily parallel unless the guide blocks 320 and 420 interfere with each other. You don't have to.

<Operation unit 500>
Next, the operation unit 500 will be described.
As shown in FIG. 1A and FIG. 2A, the operation portion 500 includes the operation lever base 502 and the release lever 510.

  As shown in FIG. 1A, 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 base plate 12 has a horizontal reference line O above the horizontal reference line O. The guide holes 16 and 18a located at are extended so as to extend in the front-rear direction and are provided so as to be located in the front-rear direction. The guide hole 16 has a length in the front-rear direction that allows the release lever 510 to be located at an operation position (that is, a first operation position to a third operation position) described later.

At the rear end of the guide hole 18a, a locking portion 18b is recessed toward the right side. The locking portion 18b may be recessed on the left side.
The release lever 510 is connected to the rear end of the operation lever base 502 by a connecting shaft 516 so as to be swingable (see FIG. 2B). The lower end of the connecting shaft 516 is slidably inserted into the guide hole 16 in the front-rear direction.

  As shown in FIG. 2 (b), screw members 516 a and 516 b are screwed onto the respective end faces at the upper and lower ends of the connecting shaft 516, and a pair of washers 518 and 520 are fitted to the operating lever base 502. The release lever 510 is prevented from being separated from the connecting shaft 516 and the connecting shaft 516 from being separated from the guide hole 16.

  As shown in FIGS. 2 (a) and 3, the release lever 510 has a guide pin 17 projecting downward, which is slidably inserted in the guide hole 18a in the front-rear direction and locked. It is formed to be engageable with and disengageable from the portion 18b. That is, in the release lever 510, when the connecting shaft 516 is in contact with the rear end of the guide hole 16, the guide pin 17 is positioned at the rear end of the guide hole 18a due to the swing around the connecting shaft 516. It is possible to select between a state in which the stopper 18b is not engaged and a state in which the stopper 18b is engaged.

  In the following, the position of the release lever 510, that is, the position of the operation portion 500, in the state in which it is positioned on the rear end side of the guide hole 16 and in which the guide pin 17 is engaged with the locking portion 18b, is referred to as “first Operation position ". Further, the position where the guide pin 17 is disengaged from the locking portion 18b and moved forward along the guide hole 18a from the rear end of the guide hole 18a by the first predetermined distance d1 is referred to as a "second operation position". . Further, the position where the guide pin 17 is moved further forward from the “second operation position” and separated from the rear end of the guide hole 18a by the second predetermined distance d2 (> d1) is the “third operation position”. Say.

  As shown in FIGS. 2 and 3, a biasing spring 522 that biases the release lever 510 backward and a biasing spring 524 that biases the release lever 510 to the right are mounted between the release lever 510 and the base plate 12. Has been done. When the release lever 510 is located at the “first operating position”, the biasing spring 524 holds the guide pin 17 in the locking portion 18b.

<Interlock mechanism 600>
The interlock mechanism 600 will be described with reference to FIG.
As shown in FIGS. 2A and 3, the interlock mechanism 600 includes an interlock member 602 swingably supported by a bearing piece 506 protruding upward from an upper surface of the operation lever base 502, and a mechanism. The base 250 includes a bearing piece 258 that protrudes upward from the upper surface of the front portion of the base 250 and a link 604 whose front and rear ends are connected to the interlock member 602. A shaft 507 that swingably supports the interlock member 602 on the bearing piece 506 is arranged so as to be coaxial with the swing shaft 254.

  The interlock member 602 has a facing surface 603 facing rearward and facing the anchor bar 38. The interlock member 602 corresponds to a lever member. Further, the operation lever base 502, the mechanism base 250, and the interlock member 602 constitute a crossing angle changing portion.

  As shown in FIG. 5, when the interlocking member 602 is unlocked and the locking mechanisms 300 and 400 are in the locked state, the opposing surface 603 is arranged so that the entire surface is arranged along the vertical direction and the stopper is provided. It is located at the front-rear position K of the surfaces 102a and 202a. Further, the facing surface 603 is configured to be tilted rearward when the wheelchair fixing device 10 described later is in a “waiting state”, a “lock releasing state”, and a “hook releasing state”.

<1. About waiting state>
As shown in FIG. 4, when the release lever 510 (operation portion 500) is located at the “first operation position”, the mechanism base 250 is interlocked by the biasing force of the torsion spring 256 shown in FIG. The front end is separated upward from the base plate 12 via the member 602 and the link 604, and is positioned higher than the rear end. In this state, as shown in FIG. 4, the facing surface 603 of the interlock member 602 is tilted rearward so as to be positioned rearward of the front-rear position K of the stopper surfaces 102a, 202a of the outer plates 102, 202. There is.

  When the release lever 510 (the operation portion 500) is located at the “first operation position”, the hook plates 106 and 206 are not engaged with the hook recesses 112 and 212 when the engagement recesses 112 and 212 are not engaged with the anchor bar 38. The lower side surface contacts the base plate 12. As shown in FIG. 4, in this state, the lock holes 114 and 214 are positioned obliquely upward at the rear end side, and the lock bars 330 and 430 biased rearward are locked in the lock holes 114 and 214. It is located close to the rear edge of the car. In this state, the lock holes 114 and 214 are positioned obliquely upward on the rear end side, and the hook plates 106 and 206 are free from upward movement against the biasing force of the biasing springs 322 and 422. It is possible to swing.

  As described above, the sliding contact line a of the lower inner peripheral surfaces (sliding contact surfaces) 116 and 216 of the lock holes 114 and 214 when the hook plates 106 and 206 are free to swing upward, The crossing angle of the lock bars 330 and 430 with respect to the linear reciprocating orbit b is referred to as an unlock angle θ1. The unlock angle θ1 is also an angle that allows the lock bars 330 and 430 to freely move the lock holes 114 and 214 from the rear end side to the front side.

The sliding contact line a is a line included in the lower inner peripheral surfaces (sliding contact surfaces) 116 and 216 of the lock holes 114 and 214, and is a line that is a locus with which the lock bars 330 and 430 are in sliding contact.
The unlock angle θ1 is larger than a lock angle θ2 described later. The unlock angle θ1 is the swing angle of the mechanism base 250 obtained by the biasing force of the torsion spring 256, the inclination of the lower inner peripheral surfaces 116 and 216 of the lock holes 114 and 214 with respect to the base plate 12, and the lower portions of the lock holes 114 and 214. It is determined by the dynamic frictional force acting between the inner peripheral surfaces (sliding contact surfaces) 116 and 216.

  In this manner, the state in which the release lever 510 (the operation unit 500) is located at the “first operation position” and the hook plates 106 and 206 are capable of swinging at least upward is hereinafter referred to as wheelchair fixation. The device 10 is called “waiting state”.

<2. Locked status>
As shown in FIG. 5, the release lever 510 (the operation portion 500) is located at the “first operation position”, and the facing surface 603 of the interlock member 602 eliminates the backward inclination, and the stopper surfaces 102a and 202a. The interlock member 602 contacts the entire lower surface of the mechanism base 250 on the base plate 12 via the link 604 when positioned at the front-rear position K.

  By abutting the mechanism base 250 on the base plate 12, the interlock member 602 is prevented from swinging counterclockwise in FIG. In the present embodiment, the position where the mechanism base 250 contacts the base plate 12 corresponds to the lock swing position. Further, as shown in FIG. 5, by eliminating the rearward inclination of the facing surface 603, the anchor bar 38 in a state of being engaged with the engaging recesses 112, 212 of the hook plates 106, 206 is applied to the facing surface 603 from the rear side. In FIG. 5, the interlock member 602 is prevented from swinging clockwise in FIG. In the present embodiment, the lower side surfaces of the hook plates 106 and 206 are brought into contact with the base plate 12 when the anchor bar 38 is completely engaged with the engaging recesses 112 and 212.

  Further, in this state, the sliding contact line a of the lower inner peripheral surfaces (sliding contact surfaces) 116 and 216 of the lock holes 114 and 214 and the straight reciprocating trajectory b of the lock bars 330 and 430 intersect when viewed from the side. The angle is set to the lock angle θ2 (<θ1).

  The lock angle θ2 is the swing angle of the mechanism base 250 obtained by the urging force of the torsion spring 256, the inclination of the lower inner peripheral surfaces 116, 216 of the lock holes 114, 214 with respect to the base plate 12, and the lower angle of the lock holes 114, 214. It is determined by the static friction force acting between the peripheral surfaces (sliding contact surfaces) 116 and 216. In this embodiment, the swing angle of the mechanism base 250, which is obtained by the biasing force of the torsion spring 256, is 0 degree because the mechanism base 250 is in contact with the base plate 12.

FIG. 8 is an explanatory diagram showing a force acting on the lock bar and the like and a moving direction of the lock bar.
As shown in the figure, when a force F1 that pushes the hook members (hook plates 106 and 206) upward is applied, the lock bars 330 and 430 are vertically moved from the lower inner peripheral surfaces 116 and 216 by the lock angle θ2. The acting input N and a static frictional force M directed rearward along the lower inner peripheral surfaces 116 and 216 are generated.

  The static frictional force M prevents the lock bars 330 and 430 from moving in the forward direction, thereby prohibiting the upward rotation of the hook plates 106 and 206 and holding the lock. .

  In this way, the state in which the release lever 510 (the operation unit 500) is located at the “first operation position” and the hook plates 106 and 206 are prohibited from swinging upward is hereinafter referred to as the wheelchair fixing device 10. "Locked state".

<3. About unlocked state>
As shown in FIG. 6, when the release lever 510 (operation unit 500) moves from the “first operation position” to the “second operation position”, the interlock member 602 moves forward by the first predetermined distance d1. By doing so, the interlock member 602 is allowed to swing in the clockwise direction. Further, due to this movement of the interlock member 602, the mechanism base 250 is urged by the torsion spring 256 so that the front end of the mechanism base 250 is located at the unlocked swing position separated from the base plate 12.

  Further, when the front end of the mechanism base 250 is separated from the base plate 12, the lock bars 330, 430 move the lock holes 114, 214 to the rear end side by the urging force of the urging springs 322, 422, as shown in FIG. I am trying to return to the position shown.

  That is, when the sliding contact line a of the lower inner peripheral surfaces (sliding contact surfaces) 116 and 216 of the lock holes 114 and 214 and the linear reciprocating trajectory b of the lock bars 330 and 430 are viewed from the side, the intersection angle is the unlock angle. The hook plates 106 and 206 are capable of swinging upward by returning to θ1.

<4. Hook released state>
As shown in FIG. 7, when the release lever 510 (the operation unit 500) is moved from the “second operation position” by “d2-d1” to the “third operation position”, the lock holes of the lock bars 330 and 430 are locked. The hook plates 106 and 206 swing upward by pressing the upper inner peripheral surfaces 117 and 217 of the 114 and 214. As a result, the anchor bar 38 can be released from the engagement recess 112.

(Operation of the embodiment)
The operation of the wheelchair fixing device 10 configured as described above will be described.
As shown in FIG. 4, when the wheelchair fixing device 10 is in the “waiting state”, the release lever 510 (the operating portion 500) is located at the “first operating position”. As shown in FIG. 1, in this state, the guide pin 17 is held in the locking portion 18b by the biasing springs 522 and 524 (see FIG. 2) against the release lever 510, and the release lever 510 is held. Are prevented from moving in the front-back direction. Further, the hook plates 106 and 206 are in a state in which the engaging recesses 112 and 212 are not engaged with the anchor bar 38, the lower side surfaces of the hook plates 106 and 206 contact the base plate 12, and the intersection angle is the unlock angle θ1. Therefore, it is possible to freely swing upwards against the biasing force of the biasing springs 322 and 422.

  In this state, when the wheelchair 20 enters from the rear and the anchor bar 38 hits the guide portions 110 and 210 of the hook plates 106 and 206, the hook plates 106 and 206 are swung upward. The pressing of the hook bar 106, 206 by the anchor bar 38 is performed against the biasing force of the torsion spring 256 and the biasing springs 322, 422.

  When the anchor bar 38 that moves rearward passes through the guide portions 110 and 210, the anchor bar 38 is engaged with the engaging recesses 112 and 212 of the hook plates 106 and 206 that swing downward due to its own weight. Further, the anchor bar 38 abuts the stopper surfaces 102a and 202a while pressing the facing surface 603 of the interlock member 602, so that the backward inclination of the facing surface 603 of the interlock member 602 is canceled and the facing surface 603 is removed. It is located at the front-rear position K of the stopper surfaces 102a and 202a.

  Then, when the anchor bar 38 presses the facing surface 603 of the interlock member 602 and positions it in the front-rear position K in this way, the entire lower surface of the mechanism base 250 is moved through the interlock member 602 and the link 604. Abut on the base plate 12. As a result, the intersection angle becomes the lock angle θ2.

As a result, the wheelchair fixing device 10 enters a locked state in which the hook plates 106 and 206 are prohibited from swinging upward.
In this state, the anchor bar 38 is still engaged with the engaging recesses 112 and 212 of the hook plates 106 and 206 even if the anchor bar 38 tries to move rearward due to a rear collision of the vehicle. 330 and 430 press the lock bars 330 and 430 downward by the inertial force caused by the rear collision or the like. Therefore, the anchor bar 38 does not come off from the engaging recesses 112 and 212.

Next, a case where the lock state is unlocked and the lock state is released will be described.
As shown in FIG. 6, when the release lever 510 (operation portion 500) is moved from the “first operation position” to the “second operation position”, the interlock member 602 moves forward by the first predetermined distance d1. As a result, the interlock member 602 is allowed to swing clockwise, and the mechanism base 250 is urged by the torsion spring 256 so that the front end thereof is separated from the base plate 12.

  Further, the front end of the mechanism base 250 is separated from the base plate 12, and the lock bars 330, 430 move the lock holes 114, 214 to the rear end side by the biasing force of the biasing springs 322, 422, as shown in FIG. Return to position.

  In this state, the crossing angle when the sliding contact line a of the lower inner peripheral surfaces (sliding contact surfaces) 116 and 216 of the lock holes 114 and 214 and the linear reciprocating trajectory b of the lock bars 330 and 430 is viewed in side view is uncertain. Return to lock angle θ1. As a result, the hook plates 106 and 206 can swing upward.

From the unlocked state, as shown in FIG. 7, the release lever 510 (operation unit 500) is moved from the "second operation position" by "d2-d1" to the "third operation position".
Then, the lock bars 330 and 430 press the upper inner peripheral surfaces 117 and 217 of the lock holes 114 and 214, thereby swinging the hook plates 106 and 206 upward and releasing the anchor bar 38 from the engagement recess 112. Set to the hook release state.

After the hook is released, the wheelchair 20 is moved backward and separated from the wheelchair fixing device 10.
The present embodiment has the following features.

  (1) The wheelchair fixing device 10 of the present embodiment has engaging recesses 112 and 212 provided at the tip thereof so that the anchor bar 38 (locked member) of the wheelchair can be engaged therein, and the base end is downward. The hook plates 106 and 206 (hook members) are swingably supported in a direction (engagement direction) and an upward direction (anti-engagement direction). The hook plates 106, 206 have lock holes 114, 214 having lower inner peripheral surfaces 116, 216 (sliding contact surfaces) extending between the base ends and the engaging recesses 112, 212. In addition, the wheelchair fixing device 10 has a linear reciprocating track b, is movably provided, and is constantly biased to press and slide the lower inner peripheral surfaces 116, 216 (sliding contact surfaces). The lock bars 330 and 430 (lock members) are arranged so that the hook plates 106 and 206 (hook members) can be swung in the engaging direction. In addition, the wheelchair fixing device 10 changes the angle of intersection between the sliding contact line a along the lower inner peripheral surfaces 116, 216 (sliding contact surface) and the straight reciprocating trajectory b of the lock bars 330, 430 (locking member). It has an operation lever base 502, a mechanism base 250, and an interlock member 602 that form an angle changing unit. The crossing angle changing portion changes the state in which the anchor bar 38 (locked member) of the wheelchair 20 is engaged with the engaging recesses 112 and 212 of the hook plates 106 and 206 (hook members) according to the change of the crossing angle. Transition between locked state to lock and unlocked state.

As a result, according to the present embodiment, it is possible to easily lock and unlock the locked member provided on the wheelchair with a simple configuration.
(2) Further, the intersection angle changing portion of the present embodiment is rocked by pressing the anchor bar 38 (locked member) at the time of entry, and the pressing direction of the anchor bar 38 (locked member). It has an operating portion 500 for swingably supporting the interlock member 602 (lever member) biased to the opposite side. Further, the intersection angle changing unit has a base end swingably connected to the operation unit 500 and has a tip extending toward the base end side of the hook plates 106 and 206 (hook members). It has a mechanism base 250 (swing member) that swings in cooperation with the swing of the interlock member 602 (lever member). The intersection angle changing unit is provided on the mechanism base 250 (swing member) and supports the lock bars 330 and 430 (lock member) to form a linear reciprocating track. Including.

  Then, in the unlocked state, the pressing of the interlock member 602 (lever member) by the anchor bar 38 (locked member) is released, which is opposite to the pressing direction of the anchor bar 38 (locked member). The interlock member 602 (lever member) biased to the side causes the mechanism base 250 (swing member) to be positioned at the unlock swing position. As a result, the intersection angle is set to an unlock angle that cannot be locked by the static frictional force between the lock bars 330 and 430 (lock members) and the lower inner peripheral surfaces 116 and 216 (sliding contact surfaces). Further, in the locked state, the mechanism base 250 (swing member) is moved to the lock swing position in accordance with the swing of the interlock member 602 (lever member) due to the pressing of the anchor bar 38 (locked member). Located in. Further, in this state, the intersection angle is locked by the static frictional force between the lock bars 330 and 430 (lock member) and the lower inner peripheral surfaces 116 and 216 (sliding contact surface) (<unlock angle). And

  As a result, according to the present embodiment, by changing the swinging state of the interlock member 602, the mechanism base 250 is positioned at the lock swinging position or the unlock swinging position, and thus the locked state and the unlocked state are obtained. You can select any of the states.

  (3) In the present embodiment, the operation portion 500 is closer to the base ends of the hook plates 106 and 206 (hook members) in the order of the first operation position, the second operation position, and the third operation position. It is arranged so that it can be operated. In the waiting state when the operation unit 500 is located at the first operation position and the interlock member 602 (lever member) is not in contact with the anchor bar 38 (locked member) of the wheelchair 20, the lever member and the lever member The swing angle of the swing member allows the intersection angle to be an unlock angle. When the crossing angle changing portion is in the locked state by pressing the anchor bar 38 (member to be locked) with the operating portion 500 located in the first operating position, and the operating portion 500 is in the second operating position. Is unlocked. Further, in the intersection angle changing portion, when the operating portion 500 is located at the third operating position, the lock bars 330 and 430 (locking members) are connected to the lower inner peripheral surfaces 116 and 216 (sliding contact surfaces) of the lock hole 114. Presses the surface on the opposite side to release the engagement of the engagement recesses 112 and 212 with the anchor bar 38 (locked member), and the hook is released.

  As a result, according to the present embodiment, by operating the operation unit 500 to the first operation position, the second operation position, and the third operation position, the waiting state or the locked state, the unlocked state, and the hook released state are obtained. The state of can be easily transited.

It should be noted that the embodiment of the present invention is not limited to the above embodiment, and may be modified as follows.
In the above embodiment, the lower side surfaces of the hook plates 106 and 206 are brought into contact with the base plate 12 in the waiting state shown in FIG. 4, but the configuration is not limited to this. For example, in the waiting state, the guide blocks 320 and 420 are urged by the urging springs 322 and 422 shown in FIG. 1 to move to the rear end side of the guide rails 310 and 410, and the lock bars 330 and 430 are The hook plates 106 and 206 may be locked to the rear ends of the lock holes 114 and 214. The lock bars 330 and 430 are locked to the rear ends of the lock holes 114 and 214, so that the rear ends of the hook plates 106 and 206 (engagement recess 112 side) are floated by the lock bars 330 and 430. Support in the state. Even in this state, the rear ends of the lock holes 114 and 214 are positioned obliquely upward, and the hook plates 106 and 206 freely swing in the vertical direction against the urging force of the urging springs 322 and 422. Enable movement.

  In the above-described embodiment, in the locked state, the entire lower surface of the mechanism base 250 is brought into contact with the base plate 12, and the position where the mechanism base 250 is brought into contact with the base plate 12 is the lock swing position. The configuration is not limited to this. For example, a contacted member (not shown) is provided above the base plate 12, and when in the locked state, the mechanism base 250 is contacted with the contacted member so that its front end is separated from the base plate 12. The mechanism base 250 may be tilted at a predetermined angle from the base plate 12. In this case, the position where the mechanism base 250 contacts the contacted member corresponds to the lock swing position. Further, in this case, in the locked state, the swing angle of the mechanism base 250 obtained by the biasing force of the torsion spring 256 is the predetermined angle from the base plate 12. Therefore, in this case, the lock angle θ2 is the swing angle (the predetermined angle) of the mechanism base 250 obtained by the biasing force of the torsion spring 256, the base plate 12 of the lower inner peripheral surfaces 116 and 216 of the lock holes 114 and 214. And the static frictional force acting between the lower inner peripheral surfaces (sliding contact surfaces) 116 and 216 of the lock holes 114 and 214.

  In the above-described embodiment, the wheelchair 20 is arranged so that the wheelchair 20 can be fixed to the wheelchair fixing device 10 by inserting the wheelchair 20 from the rear direction. However, the arrangement of the wheelchair fixing device 10 is limited to the above-described embodiment. Not something. When the wheelchair enters from the left side, the right side, or the front side of the vehicle, the arrangement direction may be changed so that the wheelchair fixing device 10 can fix the wheelchair.

10 ... Wheelchair fixing device, 12 ... Base plate,
16 ... Guide hole, 17 ... Guide pin, 18a ... Guide hole, 18b ... Locking portion,
19 ... Guide pin, 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 ... Connection part, 100 ... Hook device, 102 ... Outer plate,
102a ... Stopper surface, 104 ... Inner plate,
106 ... Hook plate (hook member), 108 ... Shaft, 110 ... Guide part,
112 ... engagement recess, 114 ... lock hole,
116 ... Lower inner peripheral surface (sliding contact surface) of the lock hole 114,
117 ... the inner peripheral surface of the upper portion of the lock hole 114,
118 ... a through hole in the outer plate 102,
120 ... a through hole in the inner plate 104,
200 ... Hook device, 202 ... Outer plate, 202a ... Stopper surface,
204 ... Inner plate, 206 ... Hook plate (hook member),
208 ... Shaft, 210 ... Guide part, 212 ... Engagement recess,
214 ... Lock hole, 216 ... Lower inner peripheral surface (sliding contact surface) of the lock hole 214,
217 ... the upper inner peripheral surface of the lock hole 214,
218 ... a through hole in the outer plate 202,
220 ... a through hole in the inner plate 204,
250 ... Mechanism base (oscillating member), 252 ... Bearing piece, 254 ... Oscillating shaft,
256 ... torsion spring, 258 ... bearing piece, 260 ... guide hole,
300 ... Lock mechanism, 310 ... Guide rail,
320 ... Guide block (linear movement member), 322 ... Energizing spring,
330 ... Lock bar (lock member), 400 ... Lock mechanism,
410 ... Guide rail, 420 ... Guide block (linear movement member),
422 ... biasing spring, 430 ... lock bar (lock member),
500 ... Operation part, 502 ... Operation lever base (support member),
506 ... Bearing pieces 506, 507 ... Shaft,
504 ... Bearing piece 510 ... Release lever, 516 ... Connection shaft,
518, 520 ... Washers, 522, 524 ... Energizing springs,
600 ... Interlock mechanism,
602 ... Interlock member (lever member), 603 ... Opposing surface,
604 ... Link, d1 ... First predetermined distance, d2 ... Second predetermined distance,
a ... Sliding tangent line, b ... Reciprocating orbit, θ1 ... Unlock angle, θ2 ... Lock angle,
K ... longitudinal positions of the stopper surfaces 102a and 202a, M ... static friction force,
N ... Input to the lock bar, F1 ... Force F1 pushing upward.

Claims (3)

A hook member, which has an engaging recessed portion provided at a distal end thereof so that a locked member of a wheelchair can be engaged therein, and whose base end is swingably supported in an engaging direction and an anti-engaging direction, Between the base end and the engagement recess, a hook member having a lock hole provided with an extended sliding contact surface,
A lock that has a linear reciprocating track and is movably provided, and that is urged at all times to press and slide the sliding contact surface so that the hook member is swingable in the engaging direction. Members,
A crossing angle changing unit that changes a crossing angle of a straight reciprocating track of the lock member with respect to a sliding contact line along the sliding contact surface, wherein the engaging recess of the hook member is formed in accordance with a change in the intersecting angle. A wheelchair fixing device having a crossing angle changing portion for making a transition between a locked state in which a locked member of a wheelchair is engaged and a unlocked state. The crossing angle changing portion is rockably operated by pressing the locked member at the time of entry, and is also capable of rocking a lever member biased to the side opposite to the pressing direction of the locked member. The operating portion to be supported is swingably connected to the operating portion, and the base end has a tip extending toward the proximal end side of the hook member, and is linked to the swing of the lever member. A rocking member that rocks, and a linear moving member that is provided on the rocking member and that supports the lock member to form a linear reciprocating track,
In the unlocked state, the pressing of the locked member on the lever member is released, and the rocking member is biased by the lever member biased to the side opposite to the pressing direction of the locked member. Is located at the unlocking swing position, the intersecting angle is an unlocking angle that cannot be locked by the static frictional force between the lock member and the sliding contact surface,
In the locked state, the rocking member is positioned at the rocking position with the rocking of the lever member due to the pressing of the locked member, and the intersecting angle is set to the lock member The wheelchair fixing device according to claim 1, wherein a lock angle (<unlock angle) is set by a static frictional force between the sliding contact surface and the sliding contact surface. The operation portion is operably arranged so as to become closer to the base end of the hook member in the order of a first operation position, a second operation position, and a third operation position,
The lever member and the swinging member are swingable in the waiting state when the operating portion is located at the first operating position and the lever member is not in contact with the locked member of the wheelchair. As a result, the intersection angle becomes the unlock angle,
The intersection angle changing unit,
When the operating portion is located at the first operating position, the locked member is pressed to be locked, and when the operating portion is located at the second operating position, the lock is released.
When the operation portion is located at the third operation position, the lock member presses the surface of the lock hole opposite to the sliding contact surface to engage the engagement recess with the locked member. The wheelchair fixing device according to claim 2, wherein the hook is released to release the hook.

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