JP2769464B2 - Telescopic mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a telescopic mechanism,
In particular, the present invention relates to a telescopic mechanism which can extend and retract and can be used as a linear actuator for moving or moving an object.

[0002]

2. Description of the Related Art As a telescopic mechanism having a large expandable width, such as a camera tripod or a radio antenna,
2. Description of the Related Art There is known an expansion and contraction mechanism in which a plurality of cylindrical members having different diameters are sequentially inserted into a member having a larger diameter and a member having a smaller diameter is slidably connected. However, in this expansion / contraction mechanism, the length is changed by directly grasping the cylindrical member at the tip by hand and pulling out or pushing in to expand and contract, and does not use the power to expand and contract from the original part. Therefore, the telescopic mechanism cannot be used for lifting or moving an object.

As an apparatus capable of lifting and moving an object, Japanese Utility Model Application Laid-Open No. 56-69103 discloses an automatic telescopic type in which the above-mentioned telescopic mechanism is expanded and contracted by using a flexible wire having an uneven portion for engagement. An antenna device has been proposed. In addition, Japanese Utility Model Publication No. 59-26121 proposes a mechanism in which a roller chain with a collar is inserted into a cylindrical member, and the roller chain is fed or pulled back by power to automatically expand and contract the above-mentioned expansion and contraction mechanism. I have.

[0004]

However, the former telescopic mechanism has a space for accommodating the wound flexible wire, and the latter telescopic mechanism has a space for accommodating the wound roller chain with a collar. If the distance becomes large and the distance that can be expanded and contracted is increased, the size of the apparatus itself increases.

Also, in the former case, it is necessary to form a concave and convex portion for engagement on the flexible wire, and in the latter case, there is a problem that a collar must be attached to the roller chain, which makes the apparatus very expensive. I was Further, the latter using the roller chain with the collar cannot support the load by itself without the cylindrical member.

The present invention has been made in view of the above facts, and has a simple structure, can be inexpensive, and can have a large extendable distance.
It is an object of the present invention to provide a telescopic mechanism that can be driven by power.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a long shape which has a C-shaped cross section which is almost a cylinder in a natural state and which becomes almost plate-shaped when expanded against elasticity. Materials and
It has a pulley for winding the plate-shaped long material, an expanding member for deforming the long material to be wound from a C-shape to a plate shape, and a driving means for rotating the pulley forward and backward. It is characterized by:

Alternatively, the elongated member is inserted into a multi-stage telescopic cylinder body in which a plurality of cylindrical members having different diameters are slidably connected to each other. May be combined with the tip of the head.

It is preferable that a feed roller is provided between the expanding member and the pulley for winding and feeding a long material.

When the pulley is rotated by the driving means and the long material is sent out, the long material becomes almost C-shaped when it passes through the expanding member, and extends straight without buckling, and the load is applied by itself. Can be supported. If the long material is stretched vertically, it becomes a jack or a lift, and if it is stretched horizontally or inclined, it becomes a transport device.

When the driving direction of the driving means is changed to reverse the pulley, the long material is pulled toward the pulley. And
When the sheet passes through the expanding member, the sheet becomes substantially flat, and can be wound by a pulley. When it is wound up, the C-shaped portion is shortened, and the load is reduced downward in the case of a jack or a lift, and is transported in the opposite direction in the case of a transport device.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention. In the figure, a long material 1 is formed by rolling a thin plate of spring steel into a C-shaped cross section until it becomes substantially cylindrical in its natural state. The long material 1 is a pulley 3 housed in a case 2
However, it cannot be wound in a C-shape. Therefore, an expanding member 4 is provided in the case 2, the tip of which is inserted into the center hole of the elongated member 1, and both sides of the elongated member 1 passing therethrough to be wound are pushed and expanded against its elasticity. , Force flat plate. The expanding member 4 is preferably made of a steel material to which lubricity is imparted by a lubrication process or the like. Further, a roller 4a may be provided in a portion that comes into contact with the long member 1 of the expanding member 4.

5 is a pressing roller, together with the expanding member 4,
The base of the cylindrical portion of the long material 1 is supported, and the long material 1 is prevented from falling below the drawing unless it is wound up by the pulley 3. When the pressing roller 5 is formed into a drum shape as shown in the drawing, the adhesion to the long material 1 is improved, and the long material 1 can be firmly gripped.

The pulley 3 is connected to a driving means 6 such as a motor, and can rotate in both forward and reverse directions, and winds the substantially flat long material 1. Pulley 3 is shown in FIG.
When rotated in the counterclockwise direction in (b), the long material 1 is wound around the pulley 3, and the C-shaped portion of the long material 1 is shortened.

When the pulley 3 rotates clockwise, the long material 1 is released, passes through the expanding member 4 in the reverse direction, returns to a C-shape, and the C-shaped portion becomes longer. Since the C-shaped portion is substantially cylindrical, it extends straight without bending.

If an object is fixed to the tip of the long material 1 and the long material 1 is expanded and contracted in the horizontal direction, it can be used for moving or transporting an object. Can be raised and lowered. Of course, the expansion and contraction direction may be a tilt direction intermediate between horizontal and vertical. Since the pulley takes up the long material 1 in a flat state and winds it up, the long material 1 can be wound around a small space, and the transport distance or the elevating distance can be extended much more than before.

If a pair of feed rollers 7, 7 is provided between the pulley 3 and the expanding member 4 and is driven by a motor 8, the long material 1 can be constantly expanded and contracted at a constant speed. Can be. The feed rollers 7, 7 make the elongated material 1 opened in a plate shape by the expanding member 4 flatter, and
To make it easy to wind up. In this case, the motor 8 and the driving means 6 on the pulley 3 side are interlocked, and if the long material 1 between the feed rollers 7, 7 and the pulley 3 becomes slack, the pulley 3
When the feed rollers 7, 7 are rotated and the long material 1 is pulled from the pulley 3, the control is performed so that the long material can be sent out. The feed rollers 7, 7 are also provided by the expanding members 4
The holding roller 5 reinforces the gripping of the long material, and also serves to hold the long material 1 so as not to fall downward in the drawing. If a gear is provided in a part of the feed roller 7 and a hole is formed in the long member 1 so as to mesh with the cylindrical gear, the expansion and contraction of the long member 1 can be controlled more reliably.

FIG. 2 is a diagram showing a main part of a second embodiment of the present invention. In this embodiment, the C-shaped portion of the long material 1 is inserted into the multi-stage telescopic cylinder 9. The multistage telescopic cylinder 9 has a plurality of cylindrical members 9a, 9b, 9c having different diameters slidably connected in the longitudinal axis direction of the cylinder, and the upper ends of the respective cylindrical members 9a, 9b are bent inward. The lower ends of the cylindrical members 9b and 9c inserted inside are warped outward. With such a configuration, the inner tubular member comes off when it moves downward in FIG. 3, but does not come off when it moves upward. The tops of the long material 1 and the multi-stage telescopic cylinder 9 are connected by welding or the like.

With such a configuration, the pulley 3 is
By rotating clockwise in (b), the multi-stage telescopic cylinder 9 extends,
When rotated in the counterclockwise direction, the multistage telescopic cylinder 9 contracts. According to the second embodiment, it can be used as an automatic telescopic antenna. If a worktable is attached to the tip of the multi-stage telescopic cylinder 9, it can be used as a workplace at a high place, and if an illumination lamp is attached, it can be used as a lighting device at a high place. Furthermore, if a camera is attached to the tip, it can be used for various purposes such as being used as a photographing device from a high place.

[0020]

According to the present invention as described above,
With a simple configuration, it is possible to provide a telescopic mechanism having a large moving distance. This telescopic mechanism can be used not only as the above-mentioned automatic telescopic antenna, but also as a jack for vertically moving a load, or as a transport device for moving horizontally.

A long member is inserted into a multi-stage telescopic cylinder body in which a plurality of cylindrical members having different diameters are slidably connected to each other. In this configuration, since the long material does not directly go outside, it is reinforced and hardly damaged. Further, if the feed roller is provided, the expansion / contraction speed can always be kept constant.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams showing a configuration of a telescopic mechanism according to the present invention, wherein FIG. 1A is a side view and FIG. 1B is a front view.

FIG. 2 is a sectional view showing a configuration of a main part of another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Long material 2 Case 3 Pulley 4 Expanding member 6 Driving means 7 Feed roller 9 Multistage telescopic cylinder

Claims (3)

(57) [Claims] 1. A long material which has a C-shaped cross section substantially in the shape of a cylinder in a natural state and becomes substantially plate-shaped when expanded against elasticity;
It has a pulley for winding the plate-shaped long material, an expanding member for deforming the long material to be wound from a C-shape to a plate shape, and a driving means for rotating the pulley forward and backward. A telescopic mechanism characterized by the following. 2. The multi-stage telescopic tubular body having a plurality of tubular members having different diameters slidably connected to each other is inserted into the multi-stage telescopic member. 2. The expansion / contraction mechanism according to claim 1, wherein a tip of the long material is connected. 3. The expansion / contraction mechanism according to claim 1, wherein a feed roller for winding and feeding the long material is provided between the expanding member and the pulley.