JPH07243268A - Elevation urging mechanism for elevatable stage - Google Patents

Abstract

PURPOSE:To provide a stage having a heavy stage panel which can fall in a nearly no-load condition. CONSTITUTION:A link piece 22 is rotatably coupled at one end to a base part 4, and is slidably engaged at the other end on a rail 14 laid on the rear side of a stage part. A link piece 21 is rotatably coupled at one end to the stage part, and is slidably engaged at the other end on a rail 44 laid on the base part 4. A coupling pin 20 is inserted in crossing parts of the link pieces 21, 22. Upper and lower spring housings 31 are swingably attached to one of the link pieces 21, 22 which is above the pin 20, and one of the link pieces 21, 22 which is below the pin 20, by means of bolts 32. A coil spring 3 through which a spring retaining rod 33 is inserted, is received in each of the spring housings 31, one end part 34 of the rod being projected from the spring housing 31. Chains 35 engaged with a sprocket wheel 25 fixed to the coupling pin 20 are coupled at opposite ends to the rod end parts 34, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ascending / descending mechanism for an ascending / descending stage which can be easily handled by encouraging an ascending movement.

[0002]

2. Description of the Related Art Conventionally, even on a comparatively small stage, since the stage board is heavy, it requires a considerable amount of force for its promotion, which is difficult to handle. In addition, if mechanical means such as a cylinder device is used, the equipment cost will be high and the maintenance will be troublesome, and there is no convenient stage where even a woman can easily move up and down.

[0003]

SUMMARY OF THE INVENTION Therefore, the present invention can be installed inexpensively with a simple structure without using mechanical means such as a cylinder device, and the stage board can be moved up with a light force to bring it closer to the stage. It was done like this.

[0004]

Therefore, according to the present invention, a pair of link members for supporting the stage are rotatably pin-connected at their central intersections, and the upper end of one link member is rotated to the stage side. In the structure in which the lower end of the other link member is rotatably connected to the base side and the pin connecting part is vertically and horizontally displaced to form a pantograph-type lifting mechanism, the center crossing of the link members is connected. A sprocket wheel fixed to the connecting pin of the part, so that the length of winding of the chain around the wheel can be lengthened as the stage descends, the upper part of the connecting pin on one link member connecting the upper end to the stage side, The chain is attached to the wheel along the lower side of the connecting pin of the other link member, and a biasing spring is connected to the chain so as to bias the connecting pin in the lateral direction on the ascending movement side. It is a Noborido biasing mechanism of the lifting stage where the structure was. According to claim 2, one or both ends of the chain is
The urging coil spring is connected to a movable member for compression to urge it.

According to a third aspect of the present invention, biasing springs are provided above the connecting pin of one of the link members whose upper ends are connected to the stage side and below the connecting pin of the other link member, and the urging spring is attached to the wheel. This is a structure in which the ends of the chains that have been reversed are connected to the biasing springs. According to a fourth aspect of the present invention, an urging spring is provided above the connecting pin of one link member whose upper end is connected to the stage side or below the connecting pin of the other link member, and is attached to the wheel. One end of the chain is connected to the biasing spring, and the biasing spring is provided above the connecting pin of one link member whose upper end is connected to the stage side or below the connecting pin of the other link member. The other end of the chain is locked to the other link member.

According to a fifth aspect of the present invention, urging springs are provided on the stage side and the base side, respectively, and the ends of the chain attached to the wheels are fixed to the connecting portions of the link member on the stage side and the base side. It is a structure in which the sprocket wheel is engaged and reversed so as to be connected to the biasing springs. According to a sixth aspect of the present invention, there is provided a sprocket in which a biasing spring is provided on either the stage side or the base side, and one end of the chain attached to the wheel is fixed to a connecting portion of the link member on the stage side or the base side. The wheel is engaged and reversed to be connected to the biasing spring, and the other end of the chain is locked to the stage side or the base side which does not include the other link member or the biasing spring.

[0007]

Operation: The stage board moves up and down in a pantograph manner by the displacement of the connecting pins connected to the pair of central intersections of the link members supporting the stage board. When the heavy stage board is lowered, the respective link members are moved. Rotate about the connecting pin as a fulcrum, and the winding length of the chain around the outer peripheral part of the sprocket wheel fixed to the connecting pin in close proximity to each other increases,
The urging spring linked to the end of the chain is activated to create a strong elastic state. As a result, the restoring force of the urging spring urges the connecting pin, to which the sprocket wheel is fixed, to move in the ascending direction of the stage plate, so that the stage plate is arranged in a nearly unloaded state. is there. Therefore, by releasing the stop of the movement of the stage board, the upward movement of the stage board by the biasing spring acts to move the stage board up with a weak force. That is, the urging spring acts by the difference in the length of wrapping around the outer peripheral portion of the sprocket wheel, resulting in the urging force for the upward movement.

When descending the stage board, it is sufficient to push down the stage board, and since the upward biasing force acts on the heavy stage board, it slowly descends. If the link member is immovable by the arbitrary stopper mechanism at the descending end of the stage plate and the rising position of the stage plate, the stage plate stops.

If the chain end is connected to the movable member that compresses the biasing coil spring, the chain is pulled by a difference corresponding to the length of winding around the outer periphery of the sprocket wheel due to the lowering of the stage plate. Is compressed,
The stage board is promoted.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The illustrated embodiments of the present invention will be described below. Figure 1
In the present example shown in FIG. 4, 1 is a stage plate, which is supported by front, rear, left and right support members 11. One end of a link member 21 is rotatably attached to the ends of the support members 11 on both sides via a fixing pin 12. On the other hand, one end of the link member 22 is rotatably attached to the end portion of the base portion 4 via the fixing pin 42, and the central intersecting portions of the respective link members 21 and 22 are connected by the connecting pin 20.

Further, the rail 1 is provided on the inner surface of the support member 11.
4 is fixed, and the roller 23 attached to the other end of the link member 22 is placed on the rail 14 so as to be rollable. The rail 44 is fixed to the inner surface of the base 4 as well. A roller 24 attached to the other end of 21 is placed on a rail 44 so that it can roll. As a result, the link member 21,
22 is a pantograph. In this example, such a structure is provided on the front and rear sides.

A roller 23 is provided at the other end of the link member 22.
As shown in FIG. 4, a stopper pin 52 biased by a spring 51 is accommodated on the upper part of the rail so that the protrusion of the stopper pin 52 can be released by a remote operation of the wire 53. The stopper pin 52 is inserted into one of the plurality of locking holes 15 communicating with the support member 11 so that the roller 23
It has a stopper mechanism to stop the. For remote operation of the wire 53, although not shown, by grasping a knob connected to the wire 53, the wire 53 can be pulled to release the protrusion of the stopper pin 52, and by releasing the knob, the stopper pin 52 is attached. It is designed to stand out.

As shown in FIG. 3, the characteristic feature of the present embodiment is that the spring box 31 can swing on one link member 21 above the connecting pin 20 and on the other link member 22 below the connecting pin 20. Bolts 32 are fastened and arranged vertically, and the spring box 31 accommodates the coil spring 3 into which the spring pressing rod 33 is inserted, and the rod end 34 projects from the spring box 31.

Then, the ends of the chains 35 engaged with the sprocket wheels 25 fixed to the connecting pins 20 are connected to the rod ends 34 and stretched.

Next, the operation of this example will be described. The raising and lowering operations of the stage board 1 may be performed by pushing up or pushing down the stage board 1 by hand, and the link members 21 and 22 are the rollers 2 at the other end.
3 and 24 are rotationally displaced by rolling, and are in the ascended state of FIG.
It will be the descent state of. The stage plate 1 can be stopped at an appropriate position by projecting the stopper pin 52 by inserting the wire 53 into one of the locking holes 15 and stopping the roller 23 by remote control of the wire 53.

In the lowered state of the stage board 1, as the link members 21 and 22 are displaced, as shown in phantom lines in FIG. 3 and in FIG. 6, the chain 35 moves toward the outer peripheral portion of the sprocket wheel 25 as they approach the horizontal state. Since the winding length increases, the spring pressing rod 33 is strongly pulled to compress the coil spring 3. Therefore, the sprocket wheel 25 is restored by the restoring force of the coil spring 3.
The urging force for moving the connecting pin 20 to the ascending side is applied via the.

That is, as shown in FIG. 6, the spring retainer rod 33 is pulled by the difference 6 in the length of wrapping around the outer peripheral portion of the sprocket wheel 25 to compress the coil spring 3 and provide an urging force for the upward movement. is there. Note that, although the drawing has described the relationship between the coil springs on the side of the stage board 1, the relationship between the coil springs on the side of the base portion 4 also has the same effect. Also, the coil spring 3
The urging force of the coil spring can be adjusted to be strong or weak by rotating the adjusting nut 36 and displacing its position to adjust the compression starting point of the coil spring 3.

Therefore, when it is desired to raise the stage board 1, if the stopper pin 52 is removed from the locking hole 15 by the remote operation of the wire 53, the stage is lightly pushed by the urging force of the connecting pin 20 toward the ascending side. The plate 1 can be lifted. Further, as the stage board 1 descends, the spring pressing rod 33 is pulled to compress the coil spring 3 and the upward biasing force increases, so that the heavy stage board 1 descends slowly.

As described above, according to this embodiment, the restoring force of the coil spring 3 urges the connecting pin 20 to move upward so that the stage board 1 is urged upward so that a balance close to an unloaded state can be obtained. As a result, the raising and lowering of the stage board 1 can be manually operated with a light force, and the raising and lowering of the stage board 1 can be performed slowly, which is safe.

Although the present embodiment is configured as described above, the present invention is not limited to this. For example, the shapes and configurations of the stage board and the base are not limited. Further, the configuration of the pair of link members and the number of installed link members are also appropriate according to the size of the stage.

Further, the type, mounting structure and position of the biasing spring are not limited. For example, the chain may be directly locked at one end of a leaf spring or a coil spring and pulled. Alternatively, as shown in FIG. 7, in the present embodiment, the stage plate and the base portion accommodate the coil springs 3 in which the spring holding rods 33 are inserted in the spring boxes 31, and the rod ends 34 of the coil springs 3 are projected from the spring boxes 31. End portions of the chain 35 engaged with the sprocket wheel 25 fixed to the connecting pin 20 along the link members 21 and 22, respectively, and the fixing pins 12 and 42 at the end portions of the link members 21 and 22 are provided. It is attached to the sprocket wheels 17 and 47 prepared for the vehicle and reversed to reverse the rod end 3
4 may be connected and stretched.

In this case, as in this embodiment, the length of the chain 35 wound around the sprocket wheel 25 around the sprocket wheel 25 increases due to the displacement of the link members 21 and 22, so that the spring pressing rod 33 is strongly pulled. In this state, the coil spring 3 is compressed, and the restoring force of the coil spring 3 gives an urging force for moving the connecting pin 20 to the ascending side. In addition, the sprocket wheel 17,
Since the winding length of 47 around the outer peripheral portion also increases, the spring pressing rod 33 is pulled more strongly, and the coil spring 3 is compressed to increase the biasing force.

Further, as shown in FIG. 8, in this embodiment,
A sprocket wheel fixed to the connecting pin 20 is provided with the urging means for accommodating the coil spring 3 having the spring pressing rod 33 inserted in the spring box 31 and projecting the rod end 34 of the coil spring 3 from the spring box 31 on one link member 22. While connecting one end of the chain 35 fixed to 25 to the rod end 34,
One end of the chain 35 may be locked to the other link member 21 and stretched. Also in this case, as in the present embodiment,
Since the winding length of the chain 35 around the sprocket wheel 25 increases due to the displacement of the link members 21 and 22, the spring pressing rod 33 is strongly pulled and the coil spring 3 is compressed. The restoring force of 3 provides the urging force that moves the connecting pin 20 to the ascending side.

Further, as shown in FIG. 9, the coil spring 3 having the spring pressing rod 33 inserted therein is housed in the spring box 31, and the rod end 34 of the coil spring 3 is projected from the spring box 31. One end of the chain 35 that is attached to the sprocket wheel 25 fixed to the connecting pin 20 is provided along the link member 22, and is attached to the sprocket wheel 47 provided at the end of the link member 22 and turned over. And the other end of the chain 35 along the link member 21, and is engaged with the sprocket wheel 17 provided at the end of the link member 21 and inverted to be locked on the stage side. You may stretch. Also in this case, as in the present embodiment,
The displacement of the link members 21, 22 increases the winding length of the chain 35 around the sprocket wheels 25, 17, 47, so that the restoring force of the coil spring 3 moves the connecting pin 20 to the ascending side. Power is given.

The structure of the stopper mechanism for immobilizing the link member is arbitrary and may be electrically operated by a motor.

[0026]

According to the first aspect of the present invention, since the stage board is biased upward by urging the connecting pin of the link member to move upward by the restoring force of the coil spring, it is close to an unloaded state. Since the balance is obtained, it is possible to raise and lower the stage board with a small force, and it is possible to slowly raise and lower the stage board for safety. According to the second aspect, the biasing spring can be easily attached, and a reliable action of the spring can be achieved.

According to claim 3, the structure can be simplified. According to the fourth aspect, it is possible to further simplify the configuration and is suitable for a small-sized lifting stage. According to the fifth aspect, since three sprocket wheels are provided, the length of winding around the chain on the outer peripheral portion is increased, which provides a stronger urging force for stage promotion. According to the sixth aspect of the present invention, the simple structure provides a stronger urging force for the stage promotion.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part showing an embodiment of the present invention.

FIG. 2 is a schematic vertical sectional side view in which the stage board is raised.

FIG. 3 is an enlarged side view in which a part of a main portion is longitudinally cut.

FIG. 4 is an enlarged vertical front view showing the stopper mechanism.

FIG. 5 is a side view showing a state where the stage board is stopped at a low position.

FIG. 6 is an enlarged side view showing a state in which the chain is attached to the sprocket wheel.

FIG. 7 is a vertical sectional side view of a main part of another example.

FIG. 8 is a side view of a main part of still another example.

FIG. 9 is a side view of a main portion of still another example.

[Explanation of symbols]

 1 stage board 11 support member 14,44 rail 15 locking hole 21,22 link member 20 connecting pin 23,24 roller 25,17,47 sprocket wheel 3 spring 31 spring box 33 spring retainer rod 34 rod end 35 chain 36 adjustment nut 4 Base part 51 Spring 52 Stopper pin 53 Wire

Claims (6)

[Claims] 1. A pair of link members for supporting the stage are rotatably pin-connected at their central intersections, and the upper end of one link member is rotatably connected to the stage side, and the other link is connected. In a pantograph-type lifting mechanism in which the lower end of the member is rotatably connected to the base side and the pin connecting part is displaced vertically and horizontally, the sprocket wheel is fixed to the connecting pin at the center intersection of the link member. However, in order to increase the length of winding the chain around the wheel as the stage descends, the upper end should be above the connecting pin of one link member connected to the stage side and below the connecting pin of the other link member. The chain is attached to the wheel along each of them, and an urging spring is connected to the chain so that the connecting pin can be laterally urged on the ascending movement side. Promotion mechanism. 2. The lifting and urging mechanism according to claim 1, wherein one end or both ends of the chain is connected to a movable member for compressing the urging coil spring. 3. An urging spring is provided above the connecting pin of one of the link members whose upper end is connected to the stage side and below the connecting pin of the other link member, and the wheel is engaged and inverted. 3. The ascending urging mechanism according to claim 1, wherein the ends of the chains are connected to urging springs. 4. An urging spring is provided on either one of a link member of one link member whose upper end portion is connected to the stage side, or a lower part of the link pin of the other link member, and is attached to the wheel. One end of the chain is connected to the biasing spring, and the biasing spring is provided above the connecting pin of one link member whose upper end is connected to the stage side or below the connecting pin of the other link member. 3. The lifting urging mechanism according to claim 1, wherein the other end of the chain is locked to the other link member. 5. A sprocket wheel in which biasing springs are provided on the stage side and the pedestal side, respectively, and ends of chains connected to the wheels are fixed to connecting portions of the link member on the stage side and the pedestal side. The ascending and urging mechanism according to claim 1 or 2, wherein the urging mechanism is engaged and reversed to be linked to the respective urging springs. 6. A sprocket in which a biasing spring is provided on either the stage side or the base side, and one end of a chain attached to the wheel is fixed to a connecting portion of the link member on the stage side or the base side. 3. The wheel according to claim 1, wherein the chain is connected to a biasing spring so that the other end of the chain is locked to the stage side or the base side that does not include the other link member or the biasing spring. Promotion mechanism.