JP2003126159A - Wheelchair vibration isolation base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheelchair vibration isolation base which can support much load by small thin layout, and give a convenient and soft ride. SOLUTION: A bottom frame 10 fixed on a body floor, a top frame 12 which is fixed on the bottom frame 10 through a link mechanism 14 so that it can move up and down freely, and the first and second elastic structures 16, 18 which are set up between the top frame 12 and the bottom frame 10 are provided. The second elastic structure 18 comprises a magnetic cushion with negative spring constant. A positive spring constant of the first elastic structure 16 is pulled down by a negative spring constant of the second elastic structure 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for a wheelchair that is attached to a shuttle car for day service or a nursing car in which a personal wheelchair can be mounted to improve the riding comfort of an elderly person or a disabled person sitting on the wheelchair. Regarding vibration isolation frame.

[0002]

2. Description of the Related Art When an automobile, a train or the like gets on, a person usually sits on a seat provided with a cushion material such as urethane, so that his / her posture is maintained to some extent and vibrations are absorbed.

On the other hand, in day-to-day services for the elderly and the disabled, transportation by car such as a one-box car is generally used, and since several elderly and disabled people are picked up at a time, the passengers first board the vehicle. Those who do this are often transported to the facility while sitting in a wheelchair for tens of minutes to an hour or more. The same applies to the case where a wheelchair is placed on a car for car service, taxi, bus, passenger train, etc.

However, when the wheelchair is placed in a vehicle as it is, the current state of absorption is that the absorption of vibration depends only on the vibration absorption by the tires of the wheelchair and the vibration absorption of the cushion when a cushion or the like is laid.

[0005]

[Problems to be Solved by the Invention] In the future, it is expected that mobility in wheelchairs will increase due to a further aging society and an increase in persons with disabilities due to car accidents and the like, and the riding comfort of wheelchairs mounted on cars is improved. There is an increasing demand to do so.

The present invention has been made in view of the above problems of the prior art, and is capable of supporting a large load mass with a small and thin layout.
The purpose is to provide a wheelchair anti-vibration stand that is easy to use and has a soft ride comfort.

[0007]

In order to achieve the above object, the invention according to claim 1 of the present invention comprises a lower frame fixed to a vehicle body floor and a link mechanism connected to the lower frame. A first frame provided between an upper frame that is vertically movably mounted and the upper and lower frames
And a second elastic structure, the second elastic structure is constituted by a magnetic spring having a negative spring constant, and the positive spring constant of the first elastic structure is set to the negative of the second elastic structure. It is characterized by being laid at the spring constant of.

The invention according to claim 2 is the above-mentioned second aspect.
The elastic structure is composed of a fixed block fixed to the lower frame and a movable frame fixed to the upper frame.At the equilibrium point of the magnetic spring, the same magnetic poles of the magnets of the fixed and movable blocks are orthogonal to each other, When the movable block moves up and down with respect to the fixed block, different magnetic poles of the fixed and movable blocks are orthogonal to each other.

Further, in the invention according to claim 3, a guide groove for a wheelchair is formed in the upper frame, and an inclined portion which rises forward when viewed from the wheelchair is provided in the guide groove, and the wheelchair on the upper frame is provided. In the fixed position, the wheelchair is tilted backward by a predetermined angle.

The invention according to claim 4 is characterized in that a lock mechanism for locking the upper frame with respect to the lower frame is provided.

The invention according to claim 5 is characterized in that a damper unit for preventing the top or bottom of the upper frame is provided.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an anti-vibration mount M for a wheelchair according to the present invention, which is attached to a shuttle car for day service or a nursing car in which a personal wheelchair can be mounted, and an elderly person sitting on the wheelchair. This is to improve the riding comfort of people with disabilities.

As shown in FIGS. 1 and 2, the vibration isolation frame M includes a frame body 2, a FRP cover 4 that covers the frame body 2, and a plurality of (for example, 4 A belt 6 and a retractable slope 8 provided at the entrance / exit of the wheelchair.

As shown in FIG. 3, the gantry body 2 has a lower frame 10 fixed to a vehicle body (not shown) and an upper frame 12 attached to the lower frame 10 so as to be vertically movable. Link mechanism 1 is provided on each of the two sides.
4, two coil springs 16 which are separated from each other by a predetermined distance in the front and back, and a magnet unit 18 which is arranged between the two coil springs 16. Further, bottom stopper preventing stopper rubbers 20 are provided on both sides of the rear end portion of the lower frame 10 (on the side where the slope 8 is provided), and a rear stopper portion preventing rubber 2 is provided behind them.
1 (see FIG. 4) is provided, the bottom frame 10 has a front end (on the opposite side of the slope 8) from which two bottom-preventing stopper rubbers 22 are separated from each other by a predetermined distance. A stopper rubber 24 for preventing top projection is provided. Further, a damper unit 26 is provided in a substantially central portion of the upper frame 12, and a lock mechanism 28 is provided in front of the damper unit 26.

As shown in FIG. 4, the link mechanism 14
The first link 30 has an upper end pivotally attached to the upper frame 12, a second link 32 having a rear end pivotally attached to a substantially central portion of the first link 30, and a lower end of the first link 30. And a third link 34 having a lower end pivotally attached to the third link 34. In addition, the second link 32 has a substantially V-shape, and an intermediate portion thereof is the bracket 3 fixed to the lower frame 10.
6 and the upper end of the third link 34 is similarly pivotally connected to a bracket 38 fixed to the lower frame 10. A contact portion 32a that abuts against the top-end preventing stopper rubber 21 is formed at the front end portion of the second link 32.

The link mechanism 14 further includes a fourth link 40 having an upper end pivotally attached to the upper frame 12, and a fifth link 4 having a rear end pivotally attached to a lower end of the fourth link 40.
2 and. The fifth link 42 has a substantially V-shape, and an intermediate portion thereof is pivotally attached to a bracket 44 fixed to the lower frame 10, and a front end portion of the fifth link 42 has a stopper rubber 24 for preventing ceiling projection. The contact part 42a which contacts with is formed.

The link mechanism 14 also includes a rod 46 extending in the front-rear direction, and a rear end portion of the rod 46 is pivotally attached to a pivotal attachment portion between the first link 30 and the second link 32, while the rod 46 is attached. The front end portion is pivotally attached to the pivotal attachment portion between the fourth link 40 and the fifth link 42.

As shown in FIGS. 5 and 6, the damper unit 26 has a substantially U-shaped damper holding member 48 whose both ends are pivotally attached to a substantially U-shaped bracket 47 fixed to the lower frame 10. And a plurality of dampers 50 and 52 attached to the damper holding member 48, and the upper frame 1
A first U-shaped first contact member 56 having both ends pivotally attached to a substantially U-shaped bracket 54 fixed to 2, and attached to the first contact member 56 via two rods 58. The second contact member 60 is provided. Further, the two rods 58 are slidably held by a sliding block 62 fixed to the damper holding member 48. In addition, a plurality of dampers 5
Of 0 and 52, the damper 50 is a ceiling struck prevention damper, and the damper 52 is a bottom struck prevention damper.

As shown in FIGS. 7 and 8, the magnet unit 18 includes a fixed block 64 fixed to the lower frame 10 and a movable block 68 attached to the upper frame 12 via an L-shaped bracket 66. Is equipped with.

The fixed block 64 includes a lower plate 70 fixed to the lower frame 10, and an upper bracket 74 integrally attached to the lower plate 70 together with a pair of outer magnet structures 72 facing each other. Each of the outer magnet structures 72 has an upper magnet 76 having an N pole formed inside and an S pole formed outside.
And a lower magnet 78 having an S pole formed on the inner side and an N pole formed on the outer side.
6, 78 are sandwiched by an inner plate 80 and an outer plate 82.

On the other hand, the movable block 68 constitutes an inner magnet structure having a magnet 84 having an N pole formed on the upper side and an S pole formed on the lower side, and a hemispherical side surface around the magnet 84. A recess 86 is formed, and the hemispherical recess 86 rotatably accommodates a ball 88 that comes into contact with the inner plate 80 of the outer magnet structure 72.

FIG. 9 shows a magnetic circuit of a magnetic spring composed of a fixed block 64 and a movable block 68. Two pairs of magnets 76, 78 having the same magnetic poles provided on both sides of the fixed block 64 face each other. The magnet 84 of the movable block 68 moves up and down in the space between
The lower plate 70, the upper bracket 74, and the outer plate 82 form a yoke.

FIG. 9 shows the equilibrium point when a person sits on the wheelchair, and at this position, the movable block 6
The magnet 84 of No. 8 has the same magnetic pole facing the two pairs of magnets 76 and 78 of the fixed block 64. Even if the movable block 68 attached to the upper frame 12 moves from this position upward or downward with respect to the fixed block 64, the magnetic poles formed on the magnets 84 of the movable block 68 are located above the fixed block 64. Alternatively, since it is orthogonal to the different magnetic poles of the lower magnets 76 and 78, it has a negative characteristic.

As shown in FIG. 10, the locking mechanism 28
Are two brackets 9 fixed to the lower frame 10.
0, a rotary shaft 92 having both ends rotatably attached, a sector gear 94 fixed to the rotary shaft 92, a first arm 96, and a first arm 96 having a lower end pivotally attached to a rear end thereof. Two arms 98 are provided, and an upper end portion of the second arm 98 is pivotally attached to a bracket 100 fixed to the upper frame 12. The tooth surface of the sector gear 94 faces the tooth surface of the lock gear 102 rotatably attached to the bracket 90, and the tooth surface of the lock gear 102 is urged toward the tooth surface of the sector gear 94 by the elastic force of the spring 104. Has been done.

The locking mechanism 28 further includes a bracket 90.
A third arm 106 having an upper end pivotally attached to the first arm 108 and a fourth arm 108 having a rear end pivotally attached to a lower end of the third arm 106.
And a fifth arm 110 having a lower end pivotally attached to an intermediate portion of the fourth arm 108, and a sixth arm 112 having a lower end pivotally attached to a front end of the fourth arm 108. Also,
The upper end of the fifth arm 110 is pivotally attached to a bracket 114 fixed to the lower frame 10,
An intermediate portion of 12 is pivotally attached to a bracket 116 fixed to the lower frame 10.

The locking mechanism 28 also includes a sixth arm 112.
7th arm 118 having a rear end to which the upper end of is pivoted
And a lock lever 122 pivotally attached to a lock lever holding member 120 fixed to the lower frame 10. Lock lever holding member 120 of the lock lever 122
A projecting portion is formed in the vicinity of the pivotally connecting portion with and the front end portion of the seventh arm 118 is pivotally connected to this projecting portion. A lock pin 124 is slidably attached to the lock lever 122, and the lock lever holding member 12
0 is a lock groove 120a into which the lock pin 124 is fitted.
And a lock release groove 120b are formed.

The operation of the wheelchair vibration isolator M having the above structure will be described below. First, when the wheelchair is not placed or when the wheelchair is getting on and off, as shown in FIG. 10A, the lock lever 122 is pulled up and the lock pin 1 is pulled up.
24 is a lock groove 120a of the lock lever holding member 120
Since it is fitted to the lower frame 1, the sector gear 94 and the lock gear 102 mesh with each other, and the upper frame 12 is
Locked to 0.

That is, when the seventh arm 118 is pushed rearward by the lock lever 122, the third arm 1
06, the fifth arm 110, and the sixth arm 116 all rotate clockwise. As a result, the lock gear 102
The sector gear 94 is formed by the cam-shaped upper end of the fifth arm 110.
Since it is pressed toward, the tooth surface of the lock gear 102 meshes with the tooth surface of the sector gear 94, and the upper frame 12 is held stationary with respect to the lower frame 10.

On the other hand, after the wheelchair is placed on the vibration isolation frame M and the wheelchair is fixed to the vibration isolation frame M by the belt 6, the lock pin 124 is slid outward, and the lock lever 122 is further moved.
Is rotated counterclockwise to fit the lock pin 124 into the lock release groove 120b of the lock lever holding member 120, as shown in FIG. The third arm 106, the fifth arm 110, and the sixth arm 116 all rotate counterclockwise via the arm 118 and the fourth arm 108. as a result,
The lock gear 10 formed by the cam-shaped upper end of the fifth arm 110.
The pressing of the second sector gear 94 is released, and the fourth arm 108 presses the lower end portion of the lock gear 102 rearward, so that the tooth surface of the lock gear 102 and the sector gear 94.
The upper frame 12 is movable up and down with respect to the lower frame 10 when the engagement with the tooth surface of the upper frame 12 is released.

When the wheelchair is placed on the vibration isolator M, the slope 8 pivotally mounted on the lower frame 10 is first lowered so that the wheel of the wheelchair is guided by the guide groove 9 (FIGS. 1 and 2). (See) and position the wheelchair on its own, or let the wheelchair run forward a predetermined distance by an assistant. The wheelchair brake (stopper) is applied at a predetermined position of the guide groove 9, and the slope 8 is raised and locked by a lock member (not shown) to prevent the falling of the wheelchair easily. It is fixed to the upper frame 12. The guide groove 9 is formed with an inclined portion that rises forward (see FIGS. 1 and 2), and the wheelchair is configured to incline rearward at a predetermined position where the wheelchair is fixed. Since the inclination angle is about 9 degrees, the seat occupant's forward displacement due to vehicle braking is prevented. The opening of the guide groove 9 is slightly widened so that a wheelchair can be easily entered, and a slip stopper is attached to the entrance.

When the vehicle is run in this state, vibrations are input to the wheelchair through the vehicle body, but
The input vibration is effectively absorbed by the vibration isolation function of the vibration isolation frame M, so that the ride comfort of the wheelchair is improved.

Here, regarding the vibration isolation function of the vibration isolation frame M,
This will be described with reference to the graphs in FIGS. 11 to 12.

FIG. 11 shows the static characteristics of the plurality of coil springs 16. In order to support a large load with a small stroke, the spring constant is set high. However, if the spring constant of the entire vibration isolation platform M is set to a high value, the resonance frequency of the vibration characteristics is close to the resonance with the human body, which may cause discomfort or harm to the seated person.

Therefore, as shown in FIG. 12, by setting the magnet units 18 provided on both sides of the vibration isolation frame M to have a structure having negative static characteristics, as shown in FIG. In the effective movable range of the gantry M, the resonance frequency of the human body and the vibration isolation gantry M can be removed by laying the spring constant. That is, it is possible to provide a vibration isolation device that supports a large load mass and has a soft spring constant with a small and thin layout.

FIG. 14 shows dynamic (vibration) characteristics when the wheelchair is directly placed on the vehicle body (without vibration isolation) and when the wheelchair is placed on the vibration isolation frame M according to the present invention. ,
As can be seen from the figure, the vibration transmissibility of the wheelchair is reduced by using the vibration isolation frame M.

When an impact load or the like that exceeds the vibration isolation range of the elastic structure including the coil spring 16 and the magnet unit 18 is input, the top-end or bottom-end structure operates to input the impact input. Absorb.

More specifically, when the lower frame 10 separates from the upper frame 12 beyond the elastic range of the elastic structure due to the downward impact displacement of the floor due to a depression or the like formed on the traveling path, FIG. 2, the second and fifth arms 32, 42 rotate counterclockwise, and the abutting portion 32 formed on the second and fifth arms 32, 42.
Stopper rubber 2 for preventing top bumps corresponding to a and 42a
1 and 24, respectively. At the same time, as shown in FIG. 5, the damper holding member 48 of the damper unit 26 is
Since the lower part 10 descends together with the lower frame 10, the top-end preventing damper 50 collides with the second contact member 60, and the impact load is effectively absorbed.

On the other hand, when the lower frame 10 approaches the upper frame 12 beyond the elastic range of the elastic structure due to the impact displacement upward of the floor due to the protrusions or the like formed on the traveling path, the lower frame 10 is attached to the lower frame 10. The stopper rubbers 20 and 22 for preventing bottom collision collide with the upper frame 12. At the same time, as shown in FIG. 6, since the damper holding member 48 of the damper unit 26 rises together with the lower frame 10, the bottom butt preventing damper 52 collides with the first contact member 56, and the impact load is effective. Is absorbed by.

[0039]

Since the present invention is constructed as described above, it has the following effects. According to the first aspect of the present invention, the second elastic structure is composed of a magnetic spring having a negative spring constant, and the positive spring constant of the first elastic structure is the second elastic structure. Since the body is laid with a negative spring constant, it is possible to support a large load mass with a small and thin layout and provide a soft ride comfort.

According to the second aspect of the present invention, the second elastic structure is composed of a fixed block fixed to the lower frame and a movable frame fixed to the upper frame, and at the equilibrium point of the magnetic spring, While the same magnetic poles of the magnets of the fixed and movable blocks are orthogonal to each other, when the movable block moves up and down with respect to the fixed block, different magnetic poles of the fixed and movable blocks are orthogonalized, so that a negative spring constant can be given. .

Further, according to the invention of claim 3,
At the fixed position of the wheelchair on the upper frame, the wheelchair is tilted backward by a predetermined angle, so that it is possible to prevent forward displacement due to breaking or the like and improve riding comfort.

Further, according to the invention of claim 4, since the lock mechanism for locking the upper frame with respect to the lower frame is provided, the upper frame can be locked when necessary (when the passenger gets on and off the wheelchair, etc.). , The usability is improved.

Further, according to the invention described in claim 5, since the damper unit for preventing the ceiling or bottom of the upper frame is provided, even if an impact load is input, it can be effectively absorbed and the ride Improves comfort.

[Brief description of drawings]

FIG. 1 is a perspective view of a vibration isolation frame for a wheelchair according to the present invention.

FIG. 2 is another perspective view of the vibration isolation frame of FIG.

FIG. 3 is a perspective view when a cover is removed from the vibration isolation frame of FIG.

FIG. 4 is a side view of a link mechanism provided on the vibration isolation frame of FIG. 1, where (a) shows top dead center and (b) shows bottom dead center.

5A and 5B are a side view and a plan view of a damper unit provided on the vibration isolation frame of FIG. 1, particularly showing a top dead center.

6A and 6B are a side view and a plan view of a damper unit provided on the vibration isolation frame of FIG. 1, particularly showing a bottom dead center.

7A and 7B are side views of a magnet unit provided on the vibration isolation frame of FIG. 1, where FIG. 7A shows top dead center and FIG. 7B shows bottom dead center.

FIG. 8 is an exploded perspective view of the magnet unit of FIG.

9 is a diagram showing a magnetic circuit of the magnet unit of FIG. 7. FIG.

10 is a side view of a lock mechanism provided on the vibration isolation frame of FIG. 1, where (a) shows a locked state and (b) shows a unlocked state.

FIG. 11 is a graph showing static characteristics of a coil spring provided in the vibration isolation frame of FIG.

12 is a graph showing static characteristics of a magnet unit provided on the vibration isolation frame of FIG.

FIG. 13 is a graph showing static characteristics in which the static characteristics of the coil spring and the static characteristics of the magnet unit are superimposed.

FIG. 14 is a graph showing dynamic characteristics with and without the vibration isolation frame of FIG.

[Explanation of symbols]

2 stand body, 4 cover, 6 belt, 8 slope, 9 guide groove, 10 lower frame, 12
Upper frame, 14 link mechanism, 16 coil spring, 18 magnet unit, 20, 22
Bottom stopper stopper rubber 21, 24 Top stopper stopper rubber, 26 Damper unit, 28
Lock mechanism, 30, 32, 34, 40, 42 link, 32a, 42a contact portion, 46, 58 rod,
48 damper holding member, 50, 52 damper, 5
6,60 Abutment member, 62 Sliding block, 64
Fixed block, 68 movable block, 70 lower plate, 72 outer magnet structure, 76 upper magnet, 78 lower magnet, 80 inner plate, 82 outer plate, 84 magnet,
86 recess, 88 ball, 92 rotating shaft, 94
Sector gear, 96, 98, 106, 108, 110, 1
12, 118 arms, 102 lock gears, 104
Spring, 120 Lock lever holding member, 12
2 lock lever, 124 lock pin, M vibration isolation frame

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshihide Nishiguchi             2-10 Yanoshinmachi, Aki-ku, Hiroshima-shi, Hiroshima             Issue Delta Touring Co., Ltd.

Claims (5)

[Claims] 1. A lower frame fixed to a vehicle body floor, an upper frame movably attached to the lower frame via a link mechanism, and first and second frames provided between the upper and lower frames. A second elastic structure, wherein the second elastic structure is a magnetic spring having a negative spring constant, and the positive spring constant of the first elastic structure is a negative spring constant of the second elastic structure. An anti-vibration stand for wheelchairs that is laid at a spring constant. 2. The second elastic structure comprises a fixed block fixed to the lower frame and a movable frame fixed to the upper frame, and at the equilibrium point of the magnetic spring, magnets of the fixed and movable blocks. 2. The anti-vibration mount for wheelchairs according to claim 1, wherein the same magnetic poles are orthogonal to each other, and when the movable block moves up and down with respect to the fixed block, different magnetic poles of the fixed and movable blocks are orthogonal to each other. 3. A guide groove for a wheelchair is formed in the upper frame, and an inclined portion that rises forward when viewed from the wheelchair is provided in the guide groove, and the wheelchair is fixed backward at a fixed position of the wheelchair on the upper frame. The anti-vibration mount for wheelchair according to claim 1 or 2, wherein the angle is inclined. 4. The vibration isolation frame for wheelchair according to claim 1, further comprising a lock mechanism for locking the upper frame with respect to the lower frame. 5. The wheelchair anti-vibration stand according to claim 1, further comprising a damper unit for preventing the upper frame from hitting the ceiling or bottom.