JPH09278322A - Elevating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent structure and installation work from becoming complicated, getting-on/off performance from being lowered, and the like. SOLUTION: When an electric motor 32 is driven, since the upper end parts of screws 30, 30 are respectively screwed with screw nuts 35, 35 fitted to leg parts 12, 12, the tip parts of rods 20, 20 are going to protrude downward. However, since this elevating device itself is installed on an installation floor, an elevating part 11 ascends. The horizontal attitude of this elevating part 11 (a bottom plate part 15) is ensured by simple mechanism of sprockets 22, 23, a chain 25, and the like, so that the structure of the elevating device itself does not become complicated. This elevating device 10 is usable only being installed in an installation place without needing installation work. Since only minimum required members such as a timing belt 31 are arranged below the bottom plate part 15, the lowest descent position of the bottom plate part 15 can be lowered so as to improve getting-on/off performance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device suitable for lifting a person or an object.

[0002]

2. Description of the Related Art Conventionally, a simple elevating device for elevating and lowering a person or an object has been used for various purposes in various places.
For example, it is used as a two-tiered parking system for automobiles in places where there is only a small parking space, and is used for lifting wheelchairs and luggage in public facilities such as stations.

FIG. 1 is a diagram showing an example of the lifting device. The lifting device 1 is equipped with a pallet 2 for mounting a lifting object (an automobile in the figure).
A pair of columns 3, 3 are erected so as to sandwich.
The pallet 2 is supported by the columns 3, 3 via the guide device 5, and is configured to be able to move up and down while maintaining the pallet 2 in a horizontal posture (a state in which the upper surface of the pallet is substantially horizontal). .

On the other hand, an electric motor 6 as a hoisting device is attached to the upper portions of the columns 3 and 3. The electric motor 6 and the pallet 2 are connected by a chain 7 to drive the pallet 2. Is configured.

Since the pallet 2 has a structure in which the pallet 2 projects horizontally from the columns 3 and 3 (hereinafter, such a structure is referred to as a "cantilever structure"), the lifting device 1 can be lifted and lowered safely. Since necessary, the columns 3 and 3 were fixed to the installation floor F, for example.

[0006]

By the way, in the conventional lifting device 1, in order to lift and lower the pallet 2 while maintaining the horizontal posture, the support column 3 and the guide device 5 moving along the support column 3 are required. And the structure was complicated.

Further, in the conventional lifting device 1, there is a problem that the columns 3, 3 have to be fixed to the installation floor F, etc., which requires a large amount of installation work and requires a high installation cost.

On the other hand, in such a lifting device, it is preferable that the installation floor surface F and the pallet upper surface 2a lowered to the lowest position are at the same height from the viewpoint of ensuring the ease of getting on and off. Especially, when such a lifting device is installed for a person in a wheelchair, the demand is high.

However, in the case of the above-described cantilever structure, since it is necessary to make the pallet 2 thick in order to suppress the bending, a step corresponding to the thickness is generated even at the lowest descent position, and the boarding / unloading property is increased. There was a problem that was worse.

To solve such a problem, a slope is provided between the pallet upper surface 2a and the installation floor surface F, or the installation floor F below the pallet is dug down to separate the installation floor surface and the pallet upper surface 2a. They need to be at the same height,
There was a problem that the installation work was difficult and the cost was high.

Therefore, an object of the present invention is to provide an elevating device which has a simple structure and is inexpensive.

It is another object of the present invention to provide an elevating / lowering device which is improved in getting on and off and does not require installation work.

A further object of the present invention is to provide an elevating device that can be elevated and lowered while maintaining a horizontal posture.

Still another object of the present invention is to provide a safe lifting device.

[0015]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and includes an upper member and a lower member which are vertically spaced apart from each other by a predetermined distance, and at least a part of these upper members. And an intermediate member arranged at a height between the lower member and the upper member and the lower member so as to be movable relative to each other, and rotatably supported by the intermediate member so as to face each other. First and second rotating bodies arranged between the upper member and the lower member, and one end of which is fixed to the upper member, and the first rotating body and the second rotating body are arranged in this order. One flexible strip having the other end fixed to the lower member, and one end fixed to the upper member, and the second rotating body and the first rotating body in this order. Other flexibility with the other end fixed to the lower member A first body and a driving unit that relatively moves the upper and lower members and the intermediate member, the first and second rotating bodies having the same number of teeth, and the first and second rotating bodies. A plurality of rotating bodies, the one flexible strip body and the other flexible strip body, respectively, and
The upper member and the lower member and the intermediate member are relatively moved based on driving the driving unit.

In this case, the driving means may be interposed between the upper member and the intermediate member or between the lower member and the intermediate member. Also,
The upper member itself or the lower member itself is an elevator, or a plurality of at least one of the upper member and the lower member is provided, and the elevator is connected between the plurality of members. The intermediate member may be placed at the installation location and the drive means may be driven to raise and lower the lift table in a horizontal position.

Further, two each of the upper member and the lower member are provided, the two lower members are arranged at a predetermined distance in the horizontal direction, and the lifting platform is provided between the two lower members. A plurality of rods connected to each other, the intermediate member penetrating the lower member and protruding below the lift table, and the plurality of rods arranged between the upper member and the lower member. And a driving member that is disposed between the upper member and the lower member, and the driving means is rotatably supported by the two lower members. Two screws housed between a member and the upper member, screw nuts attached to the two intermediate members and screwed into the two screws, respectively, and the two lower members or A drive source that is attached to either of the two upper members and drives one of the two screws, and an endless belt that is stretched between the two screws along the lifting table. Consists of a body and
It is preferable that, as the two screws are rotationally driven by the drive source, the intermediate member is driven and the plurality of rods are projected from the elevating table.

In this case, the fixing points of the end portions of the flexible strip to the upper member and the lower member, the plurality of rods, and the first and second rotating bodies are the four corners of the lift table. It is preferable that it is arranged in the vicinity of. Further, the endless belt-shaped body may be a timing belt, and the endless belt-shaped body may be a chain.

On the other hand, the intermediate member itself is used as a lifting table,
Alternatively, a plurality of the intermediate members are provided and an elevator is connected between the plurality of intermediate members, and the upper member, the lower member, or both of them are installed at the installation location,
In addition, the elevating table may be moved up and down in a horizontal posture by driving the driving means.

In this case, the fixing portions of the end portions of the flexible strip to the upper member and the lower member and the first and second rotating bodies are arranged near the four corners of the elevating table. It is preferable to do so. Further, the driving means is a means which is attached to the intermediate member and rotationally drives at least one of the first and second rotating bodies, and
As the first or second rotating body is rotationally driven, the elevating table may be elevated and lowered while maintaining a horizontal posture. A drive shaft rotatably supported by the elevating table and to which the plurality of first rotating bodies are fixed; and the drive means includes the plurality of first rotating bodies via the drive shafts. Is preferably rotationally driven.

The drive means is an electric motor.
You may do so. Further, the flexible strip may be a chain, and the first and second rotating bodies may be sprockets meshed with the chain. Further, the flexible belt is a timing belt having irregularities on both sides, and the first and second rotating bodies are toothed pulleys engaged with the timing belt. Good.

When the driving means is driven based on the above construction, the upper and lower members and the intermediate member are relatively moved.

Here, the intermediate member supports the rotating bodies having the same number of teeth, and the flexible belt is provided between the upper member and the lower member as described above. Since they are wound around each other, the relative movement amounts of the portions where the rotating bodies are supported are equal to each other.

Therefore, any one of the upper member, the lower member and the intermediate member is used as an elevating table, or a plurality of the upper member, the lower member and the intermediate member are provided and the plurality of them are provided. When an elevating table is connected between the members, the elevating table is moved up and down while maintaining a horizontal posture.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

First, a first embodiment of the present invention will be described with reference to FIGS.

FIG. 2 shows the lifting device 10 according to this embodiment.
1 is a perspective view showing the overall structure of the lifting device 10
Is a lifting unit 11 on which a wheelchair or the like is placed, and the lifting unit 11
And a leg portion (intermediate member) 12 that is configured to be movable with respect to and that supports the elevating portion 11, and is interposed between the elevating portion 11 and the leg portion 12 so as to relatively move them vertically. And drive means 13 for moving,
It is configured to raise and lower the elevating part 11 by varying the protruding length of the leg part 12 (the length of the rods 20, ... Which protrude below the bottom plate part 15 as will be described later).

The structure of the lifting device 10 will be specifically described below.

The elevating part 11 is a bottom plate part 15 as an elevating table.
The upper surface of the bottom plate portion 15 constitutes a riding surface of the wheelchair. Further, narrow plate-shaped members 16 and 16 (hereinafter, referred to as "handrail frame 16 and 1") are provided at both end edges of the bottom plate portion 15.
6 ") are respectively attached, and handrail parts 17 and 17 are erected on these handrail frames 16 and 16. These two handrail parts 17 and 17 are separated by a predetermined distance. It will be placed and will serve as a handrail when getting on and off in a wheelchair.
Each of the handrails 17 is a box-shaped member having a hollow inside and an open lower surface, and through-holes 19 and 19 are formed at both ends (and the bottom plate 15) of each handrail frame 16. There is.

That is, in the present embodiment, the inner upper surface of the handrail portion 17 functions as an upper member, and the handrail frame 1
6 functions as a lower member, and these handrail frames 16 and the inner upper surface of the handrail portion 17 are arranged at a predetermined distance in the vertical direction. Further, in the present embodiment, two handrail parts 17 and two handrail frames 16 are provided, respectively, and these two handrail frames 16 and 16 are arranged at a predetermined distance in the horizontal direction, and these two handrail frames 16 and 16 are provided.
The bottom plate portion 15 is connected between the two (see FIG. 4).

On the other hand, rods 20 and 20 of equal length are inserted into the above-mentioned through holes 19 and 19, respectively, and the upper ends of these two rods 20 and 20 are inside the handrail part 17. At load bar (connecting member)
The legs 12 (intermediate member) are integrally formed with the load bar 21 by being connected with each other. The tips of these rods 20, 20 are installed on the installation floor F, and the elevating part 11 described above is configured to be vertically movable with respect to the legs 12. In addition, the leg portion 12 includes the handrail portions 17 and 1 except the exposed tip portion.
It is designed to be stored inside 7, and each handrail part 1
One is arranged in each of 7 and 17 (two in total).

As described above, the load bar 21 has the handrail portion 1
7 inner upper surface (upper member) and handrail frame (lower member) 16
It will be placed between the load bar 21
Two sprockets 22 and 23 are rotatably supported at opposite ends of the so as to face each other. Further, as shown in detail in FIG. 3, these sprockets 22 and 23 have inner sprockets 22a and 23a and outer sprockets 22a.
b and 23b are integrally attached.

Further, inside the handrail portion 17, two chains 25 and 26 are arranged. One of these chains (one flexible band) 25 has one end fixed to the inner upper surface of the handrail part 17, and has an inner sprocket (first rotating body) 22a and an inner sprocket (second rotating body). 23
It is wrapped in the order of a and the handrail frame (lower member) 1
The other end is fixed to 6 (see FIG. 5). One end of the other chain (another flexible strip) 26 is fixed to the inner upper surface (upper member) of the handrail part, and the outer sprocket (second rotating body) 22b and the outer sprocket (first rotating member) are rotated. The body 23b is wound in this order, and the other end is fixed to the handrail frame (lower member) 16.

In this embodiment, the inner sprocket 22a and the inner sprocket 23a are arranged to face each other, and the outer sprocket 22b and the outer sprocket 23b are arranged to face each other. Two chains 25,2 that are wrapped around
6 do not touch each other.

The sprockets 22 and 23 and the chains 25 and 26 described above are arranged on the handrails 17 and 17 on both sides, respectively, and all the sprockets 22 ...
The number of teeth is set to be the same.

In the present embodiment, the leg 1
No. 2 is placed on the installation floor F and its absolute position is defined, and the elevating part 11 has four chains 25, ..., 2
The legs 12 are movably supported via 6, 6 ,.

In this embodiment, the bottom plate portion 1
5 as the sprocket 22,
The length of the chain between the upper surface of the handrail part and the upper part of the handrail part is increased, and the chain length is shortened as the bottom plate part 15 descends.
The winding state of the sprocket and the rotation direction of the sprockets 22 are not limited at all.

On the other hand, the above-mentioned drive means 13 is similar to that shown in FIG.
And, as shown in detail in FIG. 6, each handrail frame (lower member) 1
6, 16 and the upper surface (upper member) of each handrail portion, two screws 30, 30 and a timing belt (endless belt-shaped member) stretched between these two screws 30, 30. ) 31 and these screws 30, 3
And an electric motor (driving source) 32 for driving 0.

Specifically, a bearing portion 16a is provided in the center of the handrail frame (lower member) 16, and a through hole 33 is provided in the center of the load bar (intermediate member) 21. A screw nut 35 is also attached.
The lower end of each screw 30 is rotatably supported by the bearing 16a, and the upper end of the screw 30 is screwed into the screw nut 35.

The lower ends of the two screws 30 and 30 thus arranged are projected downward from the handrail frame (lower member) 16, and the toothed pulley 36 is provided on the projected portion. , 36 are fixed respectively. The above-mentioned endless timing belt 31 is arranged between the pulleys 36, 36 and is disposed inside the bottom plate portion 15. The pair of toothed pulleys 36, 36 have the same number of teeth.

Furthermore, the electric motor (driving source) 3 described above
2 is attached to one handrail part 17 or one handrail frame 16 so as to be close to the screw 30, and a toothed pulley 37 is attached to its output shaft.
A toothed pulley 39 is also attached to the screw 30, and a toothed belt 40 is wound around these toothed pulleys 37 and 39.

That is, in the present embodiment, the chains 25, ... Ends of the handrails 17, .. Inner upper surface and fixing points to the handrail frame 16, .., four rods 20 ,.
Each of the sprockets 22, ... Is near the four corners of the bottom plate portion 15 (near the four corners when the apparatus is viewed from above).
Will be placed in.

Next, the operation of the present embodiment will be described.

Now, the motor 32 is driven to drive the screw 3
When 0, 30 are rotated in a predetermined direction to bring the load bar 21 closer to the handrail frame 16, the rods 20, ... Try to project downward from the bottom plate portion 15. But rod 2
Since the tips of 0, ... Are in contact with the installation floor, the legs 12 do not move, and the reaction force raises the elevating part 11 while being supported by the legs 12. Here, the two screws 30, 30
Are connected by the toothed pulleys 36, 36 having the same number of teeth and the timing belt 31, the rotation speeds of the screws 30, ... Are equal.

When the elevating part 11 rises, the upper fixed ends of the chains 25, ... Also rise, and the respective sprockets 22, around which the chains 25, ... Are wound, respectively, in the direction of arrow U shown in FIG. Rotate. Here, since each sprocket 22, ... Has the same number of teeth, the number of rotations is also equal, and as a result, the chain length between each sprocket 22 ,. 1
The horizontal position of 5 is maintained.

When the motor 32 is rotationally driven in the opposite direction, the elevating part 11 is lowered while being supported by the leg parts 12.

Next, the effect of this embodiment will be described.

According to the present embodiment, the horizontal posture of the bottom plate portion 15 is such that the sprockets 22 having the same number of teeth, the chains 25 wound around these sprockets 22 ,.
... and held by. Therefore, it is not necessary to provide a strut or a guide device having a complicated structure as in the related art, and accordingly, the device has a simple structure, is light in weight, and is inexpensive.

Further, according to the present embodiment, the guide mechanism for maintaining the horizontal posture is formed by the sprockets 22, ... And the chains 25, .. The position can be lowered than before. Therefore, the ease of getting on and off the bottom plate portion 15 is improved, and in order to improve the ease of getting on and off, a slope is provided between the bottom plate portion 15 and the installation floor surface, or the installation floor F below the bottom plate portion 15 is dug down to install the floor surface. There is no need for installation work to make the upper surface of the bottom plate portion 15 and the upper surface of the bottom plate portion 15 at the same height, and the effect of facilitating the installation of the lifting device is achieved.

Further, according to the present embodiment, the motor 3
2 and the screws 30, ... Are provided on the handrail portions 17, .. Therefore, only the timing belt 31 may be arranged below the bottom plate portion 15. Therefore, the difference in height between the upper surface of the bottom plate 15 at the lowest position and the installation floor is 20 to 3 mm.
Can be made as small as 0 mm. As a result, there is no need to dig down the installation floor F or to install a slope between the installation floor F and the bottom plate portion 15, the cost for installation is low, and the installation of the device is easy. It will be easy.

Furthermore, according to the present embodiment, the two screws 30, 30 are the toothed pulley 3 having the same number of teeth.
6, 36 and the timing belt 31, the two screws 30, ... Are rotatably driven with the same behavior (rotational angular velocity, rotational angular acceleration), and each rod 2
The protruding lengths of 0, ... Are equal. As a result, the bottom plate portion 15 is moved up and down while maintaining the horizontal posture.

Incidentally, in such a lifting device, it is preferable that the installation floor surface and the top surface of the bottom plate portion 15 in the state of being lowered to the lowest position are at the same height from the viewpoint of ensuring the getting on / off property. Especially, when such a lifting device is installed for a person in a wheelchair, the demand is high.

In this respect, in the present embodiment, the handrail portions 17, ... Of the chains 25, ... And the handrail frame 1 are provided.
Since the fixing points to 6, 6, rods 20, and the respective sprockets 22 are arranged near the four corners of the bottom plate portion 15, the lifting device 10 does not have a so-called cantilever structure. In order to avoid bending of the bottom plate portion 15, the bottom plate portion 1
There is no need to make 5 thick. Therefore, the ability to get on and off the bottom plate portion 15 is improved accordingly, and in order to improve the getting on and off ability, a slope is provided between the upper surface of the bottom plate portion 15 and the installation floor surface, or the installation floor below the bottom plate portion 15 is dug down. Installation floor and bottom plate 1
5 There is no need for installation work to make the upper surface at the same height, and the effect of facilitating the installation of the lifting device is achieved.

Further, the lifting device 10 according to the present embodiment.
Since it can be used only by placing it in the installation place instead of the cantilever structure as in the conventional example, there is no need for installation work for fixing the support column 3 in the related art, and the cost for installation is also reduced. Furthermore, the lifting device 10 according to the present embodiment
Since it is a stationary type, the installation location can be changed as needed, and there is no need to provide an elevating device for each step, and there is an effect that the equipment cost can be reduced.

On the other hand, in the case of a hoisting device using a chain or the like, it is necessary to use a 4
It is common to use a chain of books, and in such a lifting device, there is a problem that the horizontal posture of the lifting platform cannot be secured even if one chain is cut.

However, in the case of this embodiment, the chain 2
Since both ends of 5, ... Are fixed respectively, the bottom plate portion 1
The horizontal position of 5 can be realized by three chains, and in the present embodiment, four chains 25, ... Are used. Therefore, even if any one of the chains is cut, the horizontal posture of the bottom plate portion 15 can be secured, and the safety of the device can be secured accordingly.

Further, according to the present embodiment, the chain 25 or 26, the end of which is fixed to the handrail portion 17, is wound around the one sprocket 22 or 23 from the upper side, and the end of the handrail frame 16 is also wound. Another chain 26 or 25 having a fixed portion is wound around from below. Therefore, each sprocket 22, ... Is pulled in both directions of the upper side and the lower side, and the movement position thereof is reliably defined. As a result, the bottom plate portion 15 does not sway during lifting and lowering, and the safety of the device is ensured.

Next, a second embodiment of the present invention will be described with reference to FIG.

FIG. 7 is a perspective view showing the overall structure of the lifting device 50 according to the present embodiment.
A pair of frame-shaped members 51, 51 (hereinafter, referred to as “suspension fixing frame 5
1, 51 "). This suspension fixing frame 51
Has a lower frame (lower member) 51a which is a rod-shaped member horizontally arranged and an upper frame (upper member) 51b which is a rod-shaped member arranged at a predetermined height. The lower frame 51a and the upper frame 51b are connected by the pillar members 51c and 51c, and are vertically arranged at a predetermined distance.

Further, these suspension fixing frames 51, ... Are erected at a predetermined place, with the lower frames 51a, 51a being connected to the base plate 52 and being erected at a predetermined distance. .

On the other hand, the elevating device 50 is provided with a pallet (intermediate member, elevating table) 53 arranged substantially horizontally.
Bearings 53a, 53a are attached to the pallet 53 along one edge thereof.
A drive shaft 56 is rotatably supported by a and 53a. Further, both ends of the drive shaft 56 are projected from both side surfaces of the pallet 53, and drive sprockets (first rotating bodies) 57, 57 are fixed to the projected portions, respectively. Each driving sprocket 57 is configured by integrally mounting an inner sprocket 57a and an outer sprocket 57b. Also, the pallet 53
An electric motor (driving means) 55 is attached to the motor, and the driving shaft 56 and the driving sprockets 57, 57 are configured to be rotationally driven by the motor 55.

On the other hand, other bearings 53b, 53b are attached near the edge opposite to the pallet edge on which the drive shaft 56 is attached, and these bearings 53b, 53b are attached. The driven shafts 59 and 59 are rotatably supported, and the end portions of the driven shafts 59 and 59 are pallet 5
3 is projected from both side surfaces. Then, these driven shafts 59, 59 are provided with driven sprockets (second rotating body).
60 and 60 are attached respectively.

Each driven sprocket 60 is constructed by integrally mounting an inner sprocket 60a and an outer sprocket 60b. Also, the driven shaft 5
9, 59 and drive shafts 56, 56 are arranged in parallel with each other, and each drive sprocket 57 and driven sprocket 60 face each other and the upper frame 5
It is arranged between 1b and the lower frame 51a. Further, these four sprockets 57, 57, 60, 60 are set to have the same number of teeth.

On the other hand, the device 50 is provided with four chains (flexible strips) 25, 25, 26, 26,
Two pieces are arranged in each suspension fixing frame 51. And one chain (one flexible strip) 25
Has one end fixed to the upper frame 51b, the driving inner sprocket (first rotating body) 57a and the driven inner sprocket 60a wound in this order, and the other end fixed to the lower frame 51a. Further, one chain (another flexible strip) 26 has one end fixed to the upper frame 51b, and has a driven outer sprocket (second rotating body) 60b and a driving outer sprocket (first rotating body). ) 57b is wound in this order, and the other end is fixed to the lower frame 51a.

Here, in the present embodiment, the driving inner sprocket 57a and the driven inner sprocket 60 are used.
a so as to face a and the driving outer sprocket 5
7b and the driven outer sprocket 60b are arranged so as to face each other, so that the two chains 25 and 26 wound around these do not come into contact with each other.

That is, in the present embodiment, the pallet 53 is composed of the four chains 25, ...
It is arranged at a height between the lower frame 51a and both frames 5
It will be supported by 1a and 51b so that relative movement is possible.
Then, the motor 55 causes the pallet 53 and the suspension fixing frame 51.
It becomes a driving means for moving and relatively. Further, the fixing points of the chains 25, ... To the upper frame 51b and the lower frame 51a are arranged near the four corners of the pallet 53 (near the four corners when the apparatus is viewed from above).
The sprockets 57, ... Are also arranged near the four corners of the pallet 53.

Next, the operation of this embodiment will be described.

Now, when the motor 55 is driven, the drive sprockets 57, 57 are rotationally driven via the drive shaft 56. Here, if the rotation direction of these sprockets 57, 57 is the direction of U in the drawing, the upper ends of the chains 25, 25 with which the driving sprockets 57, 57 are meshed are fixed to the upper frames 51b, 51b. Because
The drive sprockets 57, 57 move up while meshing with the chains 25, 25. At this time, the other chain 2
The driven sprockets 60, 60 are driven and rotated through the directions of U and 6 in FIG.
0 also rises while meshing with the chains 26, 26.

Since the driving sprockets 57 and 57 and the driven sprockets 60 and 60 have the same number of teeth, the pallets 60 and 60 are lifted while maintaining the horizontal posture.

When the driving sprockets 57, 57 are rotationally driven in the opposite directions, the driven sprockets 6 are
0 and 60 are also driven and rotated in the opposite direction, and the pallet 53 descends while maintaining a horizontal posture.

Next, the effect of this embodiment will be described.

According to the present embodiment, the mechanism for keeping the pallet 53 in the horizontal posture has four sprockets 57, ...
It is simply configured by the book chains 25, ..., and does not require a complicated guide device as in the past. Therefore,
As a result, the lifting device 50 has a simple structure, is light, and is inexpensive.

Furthermore, according to the present embodiment, the four sprockets 57, ... And the four chains 25, .. It also plays the role of a drive transmission member that transmits the drive of the. Therefore, since the chains 25, ... Have a plurality of functions, the number of parts can be reduced, the structure of the device is simplified, the device is light, and the cost is low.

Furthermore, according to the present embodiment, each 1
On one sprocket 57 or 60, the chain 25 or 26 whose end is fixed to the upper frame 51b is located at the upper side (upper frame 51b).
The other chain 26 or 25 whose end is fixed to the lower frame 51a is wound from the lower side (lower frame 51a).
It is wrapped around from a side). Therefore, each sprocket 57, ... Is pulled in both up and down directions, and its moving position is reliably defined. As a result, the pallet 53 does not sway during lifting and lowering, and the safety of the device is ensured.

On the other hand, in the case of a hoisting device using a chain or the like, in order to ensure the horizontal posture of the lifting platform (pallet), 4
It is common to use a chain of books, and in such a lifting device, there is a problem that the horizontal posture of the lifting platform cannot be secured even if one chain is cut.

However, in the case of this embodiment, the chain 2
Since both ends of 5, ... Are fixed respectively, the horizontal posture of the pallet 53 can be realized by three chains, and in the present embodiment, four chains 25 ,. Therefore, even if any one of the chains is cut, the horizontal posture of the pallet 53 can be secured, and the safety of the device can be secured accordingly.

In the first and second embodiments described above, the chain is used as the flexible strip and the sprockets are used as the first and second rotating bodies.
Of course, it is not necessary to limit to this. For example, a timing belt having irregularities on both sides may be used as the flexible strip and toothed pulleys may be used as the first and second rotating bodies.

Further, in the above-described first and second embodiments, the sprockets 22, ... And the sprocket 5 are
The number of 7, ... Is 4 respectively, but needless to say, the number is not limited to this, and may be more.

Further, in the above-described first and second embodiments, each inner sprocket 22a, ..., 57.
a, ... and each outer sprocket 22b, ..., 57b ,.
One chain is wrapped around each chain, but of course it is not limited to this, and each sprocket 2
Two chains may be hung on 2a, ..., so that a total of eight chains may be used. When a large number of chains are used in this way, it is possible to safely and reliably carry heavy objects.

Further, although not particularly described in the above-mentioned first and second embodiments, casters may be attached to the four corners of the bottom plate portion 15 and the base plate 52. This facilitates the movement of the lifting device.

On the other hand, in the above-described first embodiment, the rod 2 attached to one load bar 21.
The number of 0, ... Is set to two, but need not be limited to this, and may be three or more.

Further, in the above-described first embodiment, the driving force transmission of the two screws 30, 30 is performed by the pulleys 36, 36 and the timing belt 31, but needless to say, it is not limited to this. It may be performed by a gear and a chain.

Further, in the above-described first embodiment, the screw 30 as the driving means is interposed between the load bar (intermediate member) 21 and the handrail frame (lower member) 16. However, of course, the present invention is not limited to this, and the load bar 21 may be driven by being interposed between the load bar 21 and the upper surface (upper member) inside the handrail portion.

Furthermore, in the above-described first embodiment, two handrail frames 16 and 16 are provided and the bottom plate portion 15 is connected between these handrail frames 16 and 16, but of course, this The lower member is not limited to the above, and the lower member is formed of a single plate-shaped member to serve as a lifting table.
The function of supporting the lower end portions of 5, 5 may be combined with the function of an elevating portion forming the riding surface of the wheelchair.

Further, in the above-described first embodiment, the driving means 13 is constituted by the screws 30, ..., The timing belt 31, and the electric motor 32, but of course the invention is not limited to this. It may be configured by a hydraulic device or the like.

On the other hand, in the above-described second embodiment, the exclusive member (the suspension fixing frame 51) for fixing the end portions of the chains 25, ... Is provided, but of course, it is not necessary to limit to this. Absent. For example, the ends of the chains 25, ... May be fixed to the ceiling and floor of the building in which the lifting device 50 is arranged. In this case, the upper member is the ceiling of the building and the lower member is the floor surface.

Further, in the above-mentioned second embodiment, the electric motor 55 as the driving means is attached to the pallet 53, but it is not limited to this, of course, and the suspension fixing frame 51 (the upper member and the lower member). ) Side may be attached. Further, in that case, the drive source is not limited to the electric motor, and a hydraulic or pneumatic cylinder, or a hoisting device using a chain or a wire may be used.

Further, in the above-described second embodiment, the two drive sprockets 57, 57 are fixed to the same drive shaft 56 and are rotated by one motor 55. However, the sprocket 57, 57 may be driven through a gear or the like without using the drive shaft 56, or may be driven by a plurality of motors.

Further, in the above-described second embodiment, the intermediate member itself for rotatably supporting the sprockets 57, ... Is the pallet (elevating table) 53, but it is not limited to this. For example, two (or more) intermediate members that rotatably support the pair of drive sprocket 57 and driven sprocket 60 may be provided, and a pallet may be connected between these intermediate members.

[0090]

As described above, according to the present invention,
The horizontal posture of the lifting table is held by the first and second rotating bodies having the same number of teeth and the flexible strip wound around these rotating bodies. Therefore, it is not necessary to provide a strut or a guide device having a complicated structure as in the related art, and accordingly, the device has a simple structure, is light in weight, and is inexpensive.

Further, according to the present invention, since the guide mechanism for maintaining the horizontal posture has a simple structure, it is possible to lower the lowermost position of the lift table as compared with the conventional case. Therefore, the ease of getting on and off the elevator is improved.In order to improve the ease of getting on and off, a slope is provided between the elevator and the installation floor, or the installation floor below the elevator is dug down to install the installation floor and the top of the elevator. The effect of facilitating the installation of the lifting device can be achieved without the need for installation work to make the and the same height.

Further, each of the upper member and the lower member is provided two by two, the two lower members are arranged at a predetermined distance in the horizontal direction, and the lift table is provided between the two lower members. A plurality of rods connected to each other, the intermediate member penetrating the lower member and protruding below the lift table, and the plurality of rods arranged between the upper member and the lower member. And one connecting member for connecting each of the upper and lower members, and the driving means is rotatably supported by the two lower members, respectively. Two screws housed between a member and the upper member, screw nuts attached to the two intermediate members and screwed into the two screws, respectively, and the two lower members or A drive source that is attached to either of the two upper members and drives one of the two screws, and an endless belt that is stretched between the two screws along the lifting table. Consists of a body and
When the intermediate member is driven and the plurality of rods are projected from the elevating table as the two screws are rotationally driven by the driving source, the two rods may be located below the elevating table. Does not need to dispose a drive source or other device, and only the endless belt-shaped body needs to be arranged.
Can be made as small as 0 to 30 mm. In the case of a step-eliminating machine for wheelchair users, this height difference of 20 to 30 mm is a limit that can be overcome by one's own power, which is an epoch-making thing that cannot be realized by conventional elevators. As a result, there is no need to dig down the installation floor or to provide a slope between the installation floor and the lifting platform, the cost for installation is low, and the installation of the device is easy.

In this case, when the endless belt is used as a timing belt or a chain, the two screws are rotationally driven with the same behavior, and the protruding lengths of the rods are equal. As a result, the elevating table is elevated and lowered while maintaining a horizontal posture.

Further, the fixing portions of the end portions of the flexible strip to the upper member and the lower member, the plurality of rods, and the first and second rotating bodies are provided at four corners of the lifting table. When arranged in the vicinity, the lifting device does not have a so-called cantilever structure. Therefore, it is not necessary to thicken the lifting table to avoid the bending of the lifting table, and the ease of getting on and off the lifting table is improved accordingly. Furthermore, in order to improve the ease of getting on and off, a slope is provided between the upper surface of the elevator and the installation floor, or the installation floor below the elevator is dug down so that the installation floor and the upper surface of the elevator are at the same height. No need for construction,
This has the effect of facilitating the installation of the lifting device. Furthermore, since it is not a cantilever structure as described above, it is not necessary to fix the lifting device itself to the installation place. Therefore, also from this aspect, there is no need for installation work, and the cost for installation is reduced.

On the other hand, in the case of a hoisting device using a chain or the like, in order to ensure the horizontal posture of the lifting platform (pallet), 4
It is common to use a chain of books, and in such a lifting device, there is a problem that the horizontal posture of the lifting platform cannot be secured even if one chain is cut. However, in the case of the present invention, since both ends of the flexible strip are fixed to each other, the horizontal position of the lifting platform can be realized by three flexible strips. Therefore, according to the present invention, since at least four flexible strips are used, even if one of them is cut, it is possible to secure the horizontal posture of the lifting table, and the safety of the device can be secured accordingly. Is secured.

Further, according to the present invention, a flexible strip whose end portion is fixed to the upper member is wound around each of the rotating members from the side of the upper member, and the end member is attached to the lower member. Another flexible strip having a fixed portion is wound around the lower member. Therefore, each rotating body is pulled in both directions of the upper member and the lower member, and the moving position thereof is reliably defined. As a result, the elevating table does not rock during elevating, and the safety of the device is ensured.

Each of the above-mentioned effects is obtained by using the intermediate member itself as an elevating table or by providing a plurality of the intermediate members and connecting the elevating table between the plurality of intermediate members, It can also be obtained by placing the side member or both members at the installation site and driving the drive means.

When the driving means is attached to the intermediate member and at least one of the first and second rotating bodies is driven to rotate by the driving means, the flexible strip is Besides serving as a guide device for maintaining the posture of the lift table, it also serves as a drive transmission member. Therefore, the number of parts can be further reduced correspondingly, the structure of the device can be simplified, the device can be made lighter, and the cost can be reduced. Note that such an effect is remarkable when the plurality of first rotating bodies are fixed to the drive shaft and the drive shaft is rotationally driven by the drive means.

[Brief description of drawings]

FIG. 1 is a view showing a structure of a conventional lifting device.

FIG. 2 is a perspective view showing the overall structure of the lifting device according to the first embodiment of the present invention.

FIG. 3 is a view for explaining a wrapped state of the chain.

FIG. 4 is a plan view of the lifting device.

5 is a diagram for explaining the internal structure of the handrail portion, which is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a diagram for explaining the configuration of the driving unit, which is a cross-sectional view taken along line BB of FIG.

FIG. 7 is a perspective view showing the overall structure of a lifting device according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Lifting device 12 Leg part (intermediate member) 13 Driving means 15 Bottom plate part (lifting platform) 16 Handrail frame (lower member) 17 Handrail part (upper member) 20 Rod 21 Load bar (connecting member) 22 Sprocket (first) Rotating body 23 Sprocket (second rotating body) 25 Chain (one flexible strip) 26 Chain (other flexible strip) 30 Screw (driving means) 31 Timing belt (endless strip) 32 Electric motor (driving source, driving means) 35 Screw nut (driving means) 50 Lifting device 51 Hanging fixing frame 51a Lower frame (lower member) 51b Upper frame (upper member) 53 Pallet (intermediate member) 55 Electric motor (driving means) ) 56 drive shaft 57 sprocket (first rotating body) 60 sprocket (second rotating body) F installation floor

Claims (14)

[Claims] 1. An upper member and a lower member which are vertically spaced apart from each other by a predetermined distance, and at least a part of which is arranged at a height between the upper member and the lower member, and the upper member and An intermediate member that is arranged so as to be movable relative to the lower member, and a first member that is rotatably supported by the intermediate member so as to face each other and that is arranged between the upper member and the lower member. One end is fixed to the second rotating body and the upper member, the first rotating body and the second rotating body are wound in this order, and the other end is fixed to the lower member. Another end is fixed to the flexible strip and the upper member, the second rotating body and the first rotating body are wound in this order, and the other end is fixed to the lower member. The flexible band, the upper member and the lower member, and the intermediate member relatively Drive means for moving the first and second rotating bodies having the same number of teeth, the first and second rotating bodies, the one flexible strip, and the other flexible body. A plurality of strips are provided respectively, and the upper member and the lower member and the intermediate member are relatively translated in parallel based on driving the driving means. apparatus. 2. The elevating device according to claim 1, wherein the driving means is interposed between the upper member and the intermediate member or between the lower member and the intermediate member. apparatus. 3. The upper member itself or the lower member itself serves as an elevating table, or a plurality of at least one member of the upper member and the lower member is provided and between the plurality of members. An elevator is connected to the elevator, the intermediate member is installed at the installation location, and the elevator is elevated and lowered in a horizontal posture based on driving the driving means. Lifting device according to 2. 4. The upper member and the lower member are each provided in a number of two, and the two lower members are arranged at a predetermined distance in the horizontal direction, and a lifting platform is provided between the two lower members. And a plurality of rods in which the intermediate member is disposed between the upper member and the lower member and a plurality of rods that penetrate the lower member and project downward of the lift table. And a driving member that is disposed between the upper member and the lower member, and the driving unit is rotatably supported by the two lower members. Two screws housed between a member and the upper member, screw nuts attached to the two intermediate members and screwed into the two screws, and the two lower members or The above A drive source mounted on either of the two upper members to drive one of the two screws, and an endless belt-like body hung between the two screws along the lifting platform. And the plurality of rods are projected from the elevating table by driving the intermediate member as the two screws are rotationally driven by the driving source. Item 3. The lifting device according to item 3. 5. The fixing portion of the end portion of the flexible strip to the upper member and the lower member, the plurality of rods, and the first and second rotating bodies are provided at four corners of the lifting table. The lifting device according to claim 4, wherein the lifting device is arranged in the vicinity. 6. The lifting device according to claim 4, wherein the endless belt is a timing belt. 7. The lifting device according to claim 4, wherein the endless belt-like body is a chain. 8. The intermediate member itself is an elevator, or a plurality of the intermediate members are provided and an elevator is connected between the plurality of intermediate members, and the upper member, the lower member, or those members. The elevating device according to claim 1 or 2, wherein both members are installed at a setting place, and the elevating table is moved up and down in a horizontal posture based on driving the driving means. 9. The fixing portion of the end portion of the flexible strip to the upper member and the lower member and the first and second rotating bodies are arranged near four corners of the elevating table. The lifting device according to claim 8. 10. The drive means is a means attached to the intermediate member to drive at least one of the first and second rotating bodies to rotate, and the first or second rotating body rotates. 10. The elevating device according to claim 9, wherein the elevating table is moved up and down while being driven while being driven. 11. A drive shaft, which is rotatably supported by the elevating table and to which the plurality of first rotating bodies are fixed, and wherein the drive means includes the plurality of first shafts via the drive shaft. 11. The lifting device according to claim 10, wherein the rotating body is driven to rotate. 12. The lifting device according to claim 1, wherein the drive means is an electric motor. 13. The flexible band member is a chain, and the first and second rotating members are sprockets that are meshed with the chain. The lifting device according to claim 1. 14. The flexible belt is a timing belt having concavities and convexities on both sides, and the first and second rotating bodies are toothed pulleys engaged with the timing belt. The lifting device according to any one of claims 1 to 12, wherein: