JP2002308570A - Table lift - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a table lift with high safety by suppressing the inclination of a table when the table moves in vertical direction. SOLUTION: Scissors 12 and 13 are crossed in X-shape, and the crossed sections thereof comprise axes 20 rotatably connected to each other. One ends of the scissors 12 and 13 are rotatably and slidably fixed to a base frame 10, and the other ends thereof are rotatably and slidably fixed to a table 11. At least one of the scissors 12 and 13 has non-uniform lengths ranging from the axes 20 to one ends and from the axes to the other ends, and the surface of the table 11 is inclined beforehand. When a heavy load is put on the table 11, the inclination thereof due to deformation is canceled by the inclination of the pre-set table 11 by a specified angle, and the levelness of the table 11 can be assured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a table lift for moving a heavy object such as a wheelchair on which a person rides in the vertical direction by raising and lowering a table serving as a loading platform.

[0002]

2. Description of the Related Art A conventional tail lift is shown in FIG.
As shown in FIG. 2, a scissor 101 is interposed between the base frame 100 and the table 110 so as to intersect in an X-shape and has one end fixed to the table 110 and the other end rotatably and slidably fixed to the base frame 100, respectively. , 10
2 are provided. These scissors 101 and 102 are rotatably connected to each other at a shaft core 103, and portions a, b, and c from the shaft core 103 to one end fixed to the table 110 or the other end fixed to the base frame 100. The lengths of d were all set equal.

Then, the base frame 100 and the table 1
A telescopic mechanism such as a hydraulic cylinder is provided between the scissors 101 and 102 or between the scissors 101 and 102 or between the scissors 101 and 102 and the table 110, and the table 110 is expanded and contracted by expanding and contracting these telescopic mechanisms and the scissors 101 and 102. It is to move up and down.

[0004]

However, in the table lift having the above-described structure, most of the weight of the table 110 is supported by the scissors 101 and 102. When placed on top, the scissors 101 and 102 are distorted,
The table 110 may be tilted.

In particular, when the table 110 on which a heavy object is placed is supported at a position where the center of gravity is shifted, as shown in FIG. 7, the table 110 is inclined so that the side protruding from the support range of the scissors 101 and 102 becomes lower. In particular, distortion concentrates on a portion c from the axis of the scissor 101 to the other end fixed to the table 110. Here, as shown in the drawing, the table 110 is inclined such that the overhanging side of the table 110 is lower than the other side by an amount corresponding to the distortion amount A.

[0006] Then, the wheelchair placed on the table 110 is inclined in the left-right direction. In such a situation, the wheelchair is positioned on the inclined surface during the ascent and descent, and becomes unstable, so that consideration is required from a safety aspect.

[0007] These situations are not so serious problems when carrying luggage, but they are not preferable for daily use when elevating a wheelchair or the like.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a highly safe table lift by suppressing the inclination of the table surface when ascending and descending.

[0009]

In order to solve the above problems, the present invention has the following arrangement. That is, a base frame, a table disposed above the base frame, and a scissor disposed between the base frame and the table for connecting the table to the base frame in a vertically movable manner and supporting the table. And a lifting means for raising and lowering the table, wherein the scissors intersect in an X-shape, and the crossing portion has a shaft core rotatably connected, and one end of each of the scissors has a base portion. The frame has the other end pivotally and slidably fixed to the table, and at least one of the scissors has a length from the axis to one end fixed to the base frame and from the axis to the other end fixed to the table. Are unequal, and the table surface is inclined.

In this way, when a heavy object is placed on the table, the inclination due to the scissor distortion is canceled by the preset inclination of the table surface, and the horizontality of the table surface is ensured. Here, the scissors intersect in an X-shape, and the intersecting portion has a shaft core rotatably connected, one end of each of these scissors is fixed to the base frame, and the other end is rotatably fixed to the table, respectively. And the same side of one end fixed to the base frame of the scissor and the other end fixed to the table is slidable with respect to the table and the base frame, and the slidable side of the scissor is the non-slidable side. In comparison, the distance from the shaft center to the other end fixed to the table and the shaft center to one end fixed to the base frame are set longer, and the table surface can be inclined.

Here, the scissor on the fixed and non-sliding side is shorter than the scissor on the opposite side, and the amount of distortion generated when one end of the table projects from the support range of the scissor due to the sliding of the scissor is determined in advance. The table is tilted in advance so that the overhanging side of the table is higher than the opposite side according to the amount. Therefore, when a heavy object is placed on the table, the amount of distortion is canceled by the preset inclination angle, and the levelness of the table surface is ensured.

Further, the scissor crosses in an X-shape, and the crossing portion has a shaft center rotatably connected thereto,
One end of each of the scissors is rotatably fixed to the base frame, and the other end is rotatably fixed to the table, and the same side of one end and the other end of the scissor is slidably attached to the table and the base frame. The scissor on the attached side has a long distance from the shaft center to the other end fixed to the table, and the table surface can be inclined in advance.

Here, of the scissors on the side that is fixed and does not slide and the scissor on the sliding side, the portion from the shaft center to the other end fixed to the base frame is the portion from the shaft center to one end fixed to the table. The amount of distortion when one end of the table overhangs the support range of the scissor due to the slide is determined in advance, and the table is inclined in advance so that the overhanging side of the table is higher than the opposite side in accordance with the amount. In this case, the scissor portion whose length is different from the others is limited to the portion where the distortion is most generated (from the axis on the slide side to the other end fixed to the table), and the distortion is efficiently reduced. Can be corrected,
It is possible to prevent the table from shifting due to the inclination of the table.

The elevating means includes a rack erected on a base frame, a pinion provided on the table side, connected to a driving body and meshing with the rack, and a guide between the table and the rack. Means are provided,
The guide means may include a moving member that moves with the table as the table moves up and down while being in contact with the rack erected on the base frame. The moving member may be a sliding member that moves between the table and the rack in contact with the surface of the rack.

However, the raising and lowering means may be a known mechanism using an electric actuator, a hydraulic cylinder or the like.

Hereinafter, each component of the present invention will be described. (Base frame) for holding the whole, for example, L
An example is a frame formed of a mold steel or the like. (Table) It moves up and down by the operation of the telescopic mechanism.
A wheelchair or the like on which a person rides is mounted, and it is desirable to be lightweight and have high strength. In addition, for example, a mat or the like can be laid to prevent the surface from slipping from the viewpoint of safety. (Scissor) For example, it is a plate-like body and intersects the X shape, and is provided on both sides of the base frame and the table, respectively. Each of the inner and outer scissors is connected to each other, and the intersection of the scissors serves as an axis and is rotatably connected.

An end of the scissor is rotatably attached to the base frame and the table, and at least one end is slidable with respect to the table and the base frame.

In the present invention, the scissor and the base frame are desirably covered with a stretchable covering. In this way, there is no possibility that a person or an object is caught between the base frame and the table when the table is lowered. In addition, if a stop switch is provided on the lower surface of the table, and the stop switch is stopped when foreign matter touches the stop switch, the safety is further improved.

According to the table lift of the present invention, when a heavy object is placed on the table, the inclination of the table due to the distortion can be eliminated by the inclination of the table surface set in the opposite direction to the preset table surface. The horizontality of the surface is ensured.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a table lift according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a side view of a table lift 1 according to the present invention. This table lift 1 has a base frame 10
And a table 11 disposed above the base frame 10, and extendable connecting means disposed between the base frame 10 and the table 11, and the scissors 12, 13 crossing each other as the connecting means. Have.

Further, a guide means 52 is provided between the table 11 and the base frame 10 in order to prevent the table 11 from swinging when ascending and descending. The guide means 52 enables the table 11 to be stably moved up and down.

The base frame 10 is formed in a rectangular frame shape by, for example, L-shaped steel in order to improve the stability of the whole. This base frame 10 includes a scissor 12,
Thirteen lower ends are attached.

The table 11 is formed, for example, in a rectangular plate shape. A guard plate 18 protruding from the surface of the table 11 is provided on one side of the table 11, that is, on one side on which the wheelchair or the like does not enter or exit. The guard plate 18 serves as a so-called guide in the direction of entering and exiting the wheelchair. An inverted U-shaped handrail 19 is provided on the same side of the table 11 as the guard plate 18.

The scissors 12 and 13 are plate-like bodies and
The intersections are provided on both sides of the base frame 10 and the table 11, respectively. These scissors 1
2 and 13 are rotatably fixed to the base frame 10 and the table 11, and the left end is the table 1.
1 and the base frame 10 are slidably mounted via rollers 21 and 22.

The table lift 1 includes scissors 12, 1
A rack 50 and a pinion 60 are provided as a telescopic mechanism for expanding and contracting 3. Further, the table 11 and the base frame 1
0 is provided between the guide means 52 and the guide means 52. The table 11 is moved by the guide means 52 to the rack 50.
Along, a very stable lifting operation is performed.

The rack 50 penetrates one end of the table 11 and is installed so as to be perpendicular to the surface 11a of the table 11, and the base 50a is fixed to the base frame 10.

FIG. 4 shows a state in which the table 11 is lowered to the maximum along the rack 50. FIG. 4 is a rear view of the table lift, but handrails and the like are omitted.

FIG. 5 shows the guide means 52 in FIG.
It is the figure which expanded the part.

At the periphery of the rack 50 that penetrates the table 11, a support member 54, which is formed by facing two plate-like members with a predetermined width, is attached. Such a support 5
4 is provided with guide means 52, which is
1 and one.

An electric motor 53 as a driving means of the table 11 is attached to a side surface of the support 54 and connected to a pinion 60 which meshes with the rack 50 (FIG. 6).

The support 54 fixed to the table 11
Are two racks 50 each having a quadrangular cross section that are continuous in the vertical direction.
A certain distance from the side surfaces 50a, 50b (left and right sides in the figure)
Gap S ₁, S_TwoIt is erected.

Between the support 54 and the rack 50, two disc-shaped growth cast iron oil-impregnated bearings (slide collars) 56
Are inserted into the gap S ₁ and fixed to the support 54 by bolts 55.

On the other hand, a rectangular solid lubricant-dispersed sintered multilayer bearing (slide plate) 57 is inserted into the gap S _2, and is fixed to the support 54 by bolts 58.

The grown cast iron impregnated bearing 56 and the fixed lubricant dispersed-type sintered multi-layer bearing 57 are so-called oilless bearings, which are interposed between the support 54 and the rack 50 as sliding materials. It slides on top. These components do not require refueling or can be operated smoothly with a very small number of refueling operations. By adopting these components, the guide means 52 can be made maintenance-free.

The surface of the rack 50 opposite to the surface with which the pinion 60 meshes, that is, the rear surface 50c, is provided with a bearing 5
9 is in contact so that it can run. This bearing 59
Similarly to the above-mentioned sliding member, it moves on the back surface 50c while being rotatably supported by the support 54.

As described above, in the guide means 52, in addition to the pinion 60, the grown cast iron oil-impregnated bearing 56, the fixed lubricant dispersed type sintered multilayer bearing 57 and the bearing 59 are arranged so as to surround the rack 50. By filling the gap between the supports 54, the swing of the supports 54 and thus the table 11 is suppressed.

The pinion 60 is supported by a support 54 via a bearing 61. The rotation of the electric motor 53 is transmitted to the pinion 60 via a transmission mechanism (not shown). The rotation causes the pinion 60 to move along the rack 50, and the table 11 is vertically moved via the support 54. Moving. That is, the table 11 can move up and down along the rack 50.

Incidentally, the grown cast iron oil-impregnated bearing 5 shown here
6. The fixed lubricant-dispersed sintered multilayer bearing 57 and the bearing 59 are examples of a sliding material or a bearing interposed between the support 54 and the rack 50. The bearing may be replaced with another bearing having the same function, a guide roller, or the like, and is not limited to the above configuration.

When the table 11 is raised,
A remote control switch (not shown) provided on the control panel 65 or operated by a wheelchair occupant is turned on, and the electric motor 53 is operated to rotate the pinion 60 in a predetermined direction. Then rack 5
The table 11 rises along 0, and the scissors 12, 13 extend in the vertical direction. Table 11 has scissors 12 and 13
While being supported by the guide means 52, the guide means 52 guides the user to the rack 50, so that a smooth lifting operation can be performed without swinging.

When the table 11 is lowered, the electric motor 53 is reversely rotated by the same operation as described above, and the table 11 is lowered.

When the table 11 is moved up and down,
In the table 11 as shown in FIG. 1, the left side in the drawing projects from the support range of the scissors 12 and 13,
If the lengths from the axis 20 of all the scissors 12, 13 to the table or base frame are equal, the distortion due to the weight of the wheelchair will cause the table 11 to tilt so that its left side is lower.

Therefore, as shown in FIG.
Of the scissor 12 slidably attached to the base frame 10, the distance (length c) from the shaft center 20 to the other end to be fixed to the table 11 is the other a, b , d. In this case, assuming a heavy object having a predetermined weight (for example, a wheelchair on which a person is mounted), a 70 kg object is placed on the table 11.
Assuming that the device is placed above, the distortion amount A in that case is obtained.

Next, the length of the portion c of the scissor 12 is set so that the table surface is inclined in the opposite direction in advance so that the inclination of the table 11 due to the distortion amount A can be eliminated. I do. In this case, the inclination angle α corresponding to the distortion amount A is set in advance so that the left side of the table 11 is higher as shown in FIG.

The other ends of the scissors 12, 13 of the scissors 12, 13 on the fixed and non-sliding side (right side in the drawing) and the scissors 12, 13 on the sliding side are fixed from the shaft center 20 to the base frame. Is shorter than the portion c from the shaft center 20 to one end fixed to the table.

When the wheelchair is placed on the table 11, the distortion amount A and the inclination angle α are balanced, and the horizontal state of the table 11 is ensured.

In this way, the part of the scissor having a different length from the other parts is the part where the distortion is most frequently generated.
(From the shaft center to the other end fixed to the table). This makes it possible to efficiently correct the distortion and prevent the table from being displaced due to the inclination of the table. That is, if the lengths of c and d are the same and both are longer than a and b,
3 deviates from the base frame 10 in the direction of the arrow in FIG.

On the other hand, a push button type upper limit switch 62 of the electric motor 53 is provided at the upper end of the support 54, and a contact 62a of the upper limit switch 62 protrudes upward.

Similarly, a lower limit switch 63 of a push button type for the electric motor 53 is provided at a lower end of the support 54, and a contact 63b of the lower limit switch 63 projects downward.

At the upper end of the rack 50, an upper contact plate 64 of an upper limit switch 62 is provided.
When 1 rises to the upper limit position, the contact 62a comes into contact with it and is pressed, the switch is turned off, and the lifting of the table stops.

On the other hand, a lower contact plate 65 of a lower limit switch 63 is provided at the lower end of the rack 50, and when the table 11 is lowered to the lower limit position, the contact 63a comes into contact with and is pressed by this switch. Is turned off, and the lowering of the table stops.

Therefore, when the table 11 is moved up and down, it is ensured that the table 11 is moved up and down in a range where the upper limit switch 62 and the lower limit switch 63 are in the ON state, that is, a preset operation range, thereby ensuring safety. You.

As described above, in the present embodiment, the inclination of the table 11 when a load is generated is corrected by increasing the length from the axis 20 of the scissors 12 and 13 to one end fixed to the table 11. The ends of the scissors 12 and 13 slide along the base frame 10 and the table 11 with a wheelchair or the like mounted thereon, and even if the support range of the table 11 by the scissors is deviated, the table 11 does not tilt and is horizontal. Is held.

The rack 50 is erected on the base frame 10 and guide means 52 is provided between the table on the table 11 side and the base frame 10. The guide means 52 stands on the base frame 10. Since a moving member such as a sliding member that moves with the table 11 as the table 11 moves up and down while contacting the provided rack 50 is included, no gap is generated between the rack 50 and the table 11. Therefore, swinging of the table 11 at the time of elevating can be reliably prevented.

The table 11 is moved up and down by the engagement of the rack 50 and the pinion 60.
A situation in which the table 11 suddenly drops due to a decrease in the supporting force can be avoided, and the number of failures is reduced as compared with a case where a cylinder is used, so that reliability is improved.

[0056]

As described above, according to the present invention, when a heavy object is placed on a table, the inclination of the table due to the distortion is eliminated by the inclination of the table surface set in the opposite direction. And the levelness of the table surface is ensured. Therefore, it is possible to provide a table lift with high safety when moving up and down.

[Brief description of the drawings]

FIG. 1 is a side view showing a state where a table of a table lift of the present invention is lifted.

FIG. 2 is a side view showing a lower frame to which scissors having different lengths are attached.

3 is a side view showing a state where a table supported by the scissor shown in FIG. 2 is provided.

FIG. 4 is a rear view showing the table in a lowered state;

FIG. 5 is a diagram showing a main part of the guide means.

FIG. 6 is a diagram showing a positional relationship between a rack and a pinion;

FIG. 7 is a diagram showing the length of a scissor in a conventional table lift and the inclination of the table due to distortion under load.

[Explanation of symbols]

 Reference Signs List 1 Table lift 10 Base frame 11 Table 12, 13 Scissor 20 Shaft core 50 Rack 52 Guide means 56 Growth cast iron oil-impregnated bearing 57 Fixed lubricant dispersed type sintered multilayer bearing 59 Bearing 60 Pinion 61 Bearing

Claims (3)

[Claims] 1. A base frame, a table disposed above the base frame, and a table disposed between the base frame and the table, the table being connected to the base frame so as to be able to move up and down, and supporting the table. A table lift comprising a scissor for raising and lowering the table, wherein the scissor intersects in an X-shape, and the intersecting portion has an axis that is rotatably coupled, and One end is rotatably and slidably fixed to the base frame at the other end, and at least one of the scissors is fixed to the table from the shaft center to one end fixed to the base frame and at least one of the scissors is fixed to the table from the shaft center. A table lift, wherein the length to the end is unequal and the table surface is inclined. 2. The scissor crosses in an X-shape, and the crossing portion has a shaft core rotatably connected to the scissor. One end of the scissor is rotatably connected to the base frame, and the other end is rotatably connected to the table. One end fixed to the base frame of the scissor and the other end fixed to the table are slidable with respect to the table and the base frame, and the slidable side of the scissor is slidable. The distance from the axis center to the other end fixed to the table and the axis center to the one end fixed to the base frame is set longer than that of the non-shaft side, and the table surface is inclined. The described table lift. 3. The scissor is elongate and crosses in an X-shape, and the crossing portion has a shaft core rotatably connected with one end of the scissor on the base frame and the other end on the base frame. One end of the scissor, which is rotatably fixed to the table and the other end fixed to the base frame of the scissor and the other end fixed to the table, is slidably mounted on the table and the base frame, and is slidably mounted. The table lift according to claim 1, wherein the scissor on the set side has a long distance from the axis to the other end fixed to the table, and the table surface is inclined.