JPH09249395A - Expansion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the extent of vibrations sharply by connecting two flexures of at least a pair of linkage mechanism, in an expansion device provided with plural units of these pantographic linkage mechanism. SOLUTION: A short groove 15 is connected to only a flexure 19 being situated upward, while a long groove 14 is not connected to this flexure 19, namely, it is free. Each of two bar members 3 at both upper and lower parts of a linkage device 2 is locked to each of both long and short grooves 14 and 15 installed in a base plate 1 and a movable plate 7. Each bar member 3 slides with a slide pin 10 and pivoted to the long groove 14, and likewise it is pivoted to the short groove 15 free of rotation by a securing pin 6. In addition, the flexure 19 is connected by an L-shaped fitting 9. In the case where the linkage device 2 is extended, the flexure 19 expands or contracts in a state of being connected and, in turn, the linkage device 2 moves to the side of the L-shaped fitting 9. Accordingly a pair of adjacent flexures are connected each other, and these planar structural linkage devices are connected together into an L-shaped three- dimensional structure, through which bending and torsional rigidity can be improved in this way.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device for raising and lowering a load such as a studio lighting device, and more particularly to a lifting device capable of maintaining sufficient rigidity even when the load of the load fluctuates.

[0002]

2. Description of the Related Art Generally, in a TV studio or theater, when raising or lowering a lighting device to a desired height, the lighting device is supported by a stationary portion or a moving means of the ceiling through an expansion / contraction device, and the lighting device is placed in a desired space. The lighting device is moved up and down or moved. Conventionally, as such an elevating device, a fishing rod type or a pantograph type using a pantograph is used in which a plurality of pipes are accommodated and extended with respect to the large diameter pipe at any time by the form of a telescopic mechanism. Has been. However, the fishing rod type has drawbacks such as dead space equivalent to one stage of pipe when storing, and it can not be stored when curved, the pantograph type is excellent in that it can be easily stored, but due to its structure, it rolls. There was a drawback that the vibration caused by was large.

Therefore, the applicant of the present invention has proposed an expansion / contraction device which is an improved pantotype and is strong against rolling. This telescopic device
As shown in FIG. 7, between two rectangular support plates 61 and 67 provided in parallel with each other at intervals in the vertical direction, and between the support plates 61 and 67 so as to suspend and support the support plate 61. It is composed of four pantograph-shaped link mechanisms 62 interposed.

Here, the link mechanism 62 is composed of a plurality of hollow rectangular bar members 63, which are connected to each other to form a rhombic frame. That is, each rod member 63 is rotatably supported one after another by the rotating shaft 64 at the end point and the middle point,
The opening degree of each of the connected rod members 63 changes, and the link mechanism 62 can be expanded and contracted.

Further, the support plates 61 and 67 are provided with long grooves and short grooves along side edges of each side so that they can be connected to the link mechanism 62, and the two bar members 63 above the link mechanism 62. One is inserted into the long groove 84 and is rotatably fixed by the slide pin 70.
At the same time, it can move in the groove, and the other is inserted into the short groove 85 and fixed rotatably by the fixing pin 66. The lower part of the link mechanism 62 has a similar structure.

As described above, since the pantograph-shaped link mechanism is provided on each side of the support plate, lateral vibration is reduced.

[0007]

However, when the above-mentioned expansion device is used by suspending it on a movable means which moves above the ceiling, for example, when it is stopped after moving in the horizontal direction,
There is a drawback that it vibrates back and forth due to a bending moment due to inertia, and when a rotating body is installed on the lower support plate and it rotates, it vibrates due to a torsion moment, so the next work cannot be started until the vibration is damped, and there is a lot of loss time. .

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a novel expansion / contraction device capable of significantly reducing the vibration even after the vibration or the rotation device after the horizontal movement is stopped is mounted.

[0009]

In order to achieve the above object, the first aspect of the present invention is to provide a movable plate in parallel with and spaced from a substrate and a movable plate positioned in parallel. An expansion / contraction mechanism including a plurality of pantograph-shaped link mechanisms, in which bent portions of at least a pair of adjacent link mechanisms are connected to each other, and a second invention is an actuator for separating the substrate and the moving plate from each other. Be prepared.

As described above, according to the present invention, by connecting the bent portions of at least a pair of adjacent link mechanisms, it is possible to greatly reduce the vibration after the horizontal movement is stopped and the vibration due to the rotating device.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the expansion / contraction device of the present invention has a rectangular substrate 1 and a moving plate 7 which are vertically spaced from each other and parallel to each other, and the substrate for suspending and supporting the moving plate 7. It is composed of four pantograph-shaped link mechanisms 2 provided between the movable plate 7 and the movable plate 7 and an L-shaped metal fitting 9 that connects the bent portions 19 of the link mechanism 2.

The base plate 1 and the moving plate 7 are provided with a long groove 14 and a short groove 15 for connecting to the link mechanism 2 along the side edges of each side.
Are provided one by one on a straight line. However, the long groove 14
The short groove 15 and the short groove 15 are provided so as to be adjacent to the long groove 14 and the short groove 15 provided on the adjacent sides.

The link mechanism 2 is composed of a hollow rectangular rod member 3 as shown in FIG. 4, and the rod members 3 overlap each other at their end points and at their midpoints and are rotatable by a rotary shaft 4. It is supported and forms a rhomboid frame. Therefore, as shown in FIG. 3, the link mechanism 2 can be expanded and contracted vertically by applying an external force to change the opening degree θ formed by each rod member 3 at the midpoint. For example, in the figure, when the link mechanism 2 is extended upward, the opening θ becomes smaller and the slide pin 10 moves in the direction of the arrow. Further, as shown in FIG. 2, the bent portion 19A including the rod member 3 and the rotary shaft 4 is rotatably connected to the bent portion 19B of the adjacent link mechanism 2 by the L-shaped metal fitting 9. However, as shown in FIG. 1, this connection connects only the bent portion 19 in which the short groove 15 is located above, and the bent portion in which the long groove 14 is located above is not connected and is free. There is. That is, the bent portions 19 that are connected are gathered on one diagonal line of the quadrangle formed by the four link mechanisms 2, and the bent portions 1 that are not connected are connected.
9 are gathered near the other diagonal.

Further, each two above and below the link mechanism 2
The bar member 3 of the book is fixed to the long groove 14 and the short groove 15 provided in the substrate 1 and the moving plate 7, respectively, and the link mechanism 2
Is capable of suspending and supporting the moving plate 7. Here, each rod member 3 is rotatably and rotatably supported by the slide pin 10 in the long groove 14 and rotatably and rotatably by the fixed pin 6 in the short groove 15.

Therefore, the expansion / contraction device changes the opening formed by the rod member 3 constituting the pantograph-shaped link mechanism 2 by an external force, and slides the rod member fixed by the slide pin 10 to make the link mechanism. By expanding and contracting the substrate 2, the substrate 1 and the moving plate 7 can be brought close to and separated from each other. Here, since the bent portion 19 is connected by the L-shaped metal fitting 9, when the link mechanism 2 extends,
The bent portion 19 expands and contracts in a connected state, and the link mechanism 2 moves toward the L-shaped metal fitting 9 side.

The operation of the embodiment will be described.

In the expanding / contracting device having the above-described structure, the linking mechanisms of at least a pair of adjacent linking mechanisms are connected to each other so that the linking mechanisms having a planar structure are connected to each other to form an L-shaped three-dimensional structure. The rigidity will be greatly improved.

Next, a modified embodiment of the present invention will be described.

In the above embodiment, the substrate and the movable plate are
Two types of grooves, long groove and short groove, are provided, but they are fixed in the groove 2
The shape of the groove is not limited as long as one of the rod members of the book is fixed and the other is free.

Further, as shown in FIG.
When the telescopic device is mounted on a substrate and used by suspending it, the actuator 16 is placed above the substrate 1 and the actuator 1
An elevating rope 17 connected to 6 may be attached to the moving plate 7, and the moving plate 7 may be moved up and down by an actuator.

Further, as the expansion / contraction mechanism, a link mechanism 2 may be used in which rod members 3 having different lengths are crossed one after another at a constant interval as shown in FIG. 6, and the rod members are rotatable about a rotary shaft. There is no particular limitation as long as it is a telescopic mechanism having a pivotally supported structure.

Here, the shapes of the substrate and the movable plate are preferably polygonal because the link mechanism can be connected to the side edge, and particularly, the polygon having even sides is desirable because the link mechanism can be connected uniformly. Further, the metal fitting for connection may be of a V shape or the like as long as it has a shape adapted to the position of the adjacent link mechanism.

[0024]

In summary, according to the present invention, since the link mechanism having a planar structure can be connected to form a three-dimensional structure, excellent bending rigidity and torsional rigidity can be exhibited, and the telescopic device can be moved or rotated. Even when the device is installed, the vibration is immediately attenuated, so that the work can be performed efficiently.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a telescopic device according to the present invention.

FIG. 2 is an enlarged view showing the link mechanism of FIG.

FIG. 3 is a configuration diagram showing a link mechanism and a moving plate.

FIG. 4 is a view showing a cross section of a rod member.

FIG. 5 is a diagram showing a modified embodiment of the present invention.

FIG. 6 is a diagram showing a modified embodiment of the present invention.

FIG. 7 is a perspective view showing one form of a conventional expansion / contraction device.

[Explanation of symbols]

 1 substrate 2 link mechanism 3 rod member 4 rotating shaft 6 fixed pin 7 moving plate 9 L-shaped metal fitting 10 slide pin 14 long groove 15 short groove 19 bent portion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuhiro Sato 5-1-1 Hidaka-cho, Hitachi City, Ibaraki Prefecture Hitachi Cable Co., Ltd. Hidaka Plant (72) Inventor Masami Murayama 4 Hidaka-cho, Hitachi City, Ibaraki Prefecture 12-12-1 Hitachi Cable Equipment Co., Ltd. (72) Inventor Koji Hattori 3-37-7 Nishikujiya, Ota-ku, Tokyo Marumoshi Electric Co., Ltd. Technical Center (72) Inventor Kazuki Sotomura Minami, Kyoto-shi, Kyoto Prefecture Nishi-Kujo-Toyota-cho, Ichi-ban, Kane-dori Co., Ltd.

Claims (2)

[Claims] 1. A substrate and a moving plate which are parallel to each other,
An expander / contractor comprising a plurality of pantograph-shaped link mechanisms for moving a moving plate closer to and away from the substrate in parallel, wherein at least a pair of adjacent link mechanisms are connected to each other at a bent portion. 2. The expansion / contraction device according to claim 1, further comprising an actuator that separates the substrate and the movable plate from each other.