JPH02296977A - Telescopically movable strut device - Google Patents

Abstract

PURPOSE:To contrive the automatization by forming a connection part in the upper end inner surface and the lower end outer surface of each cylindrical body of different- bored cylindrical bodies, which are formed with bottoms, while introducing turning force from the outside to the small-bored cylindrical body and the large-bored cylindrical body in which the small-bored cylindrical body is inserted. CONSTITUTION:An internal thread 2b and a lip seal material 2d are respectively provided in the upper end internal periphery and in the bottom part 2c of a hollow cylindrical body 2 loosely housed in the inside of a basic cylindrical body 1. An internal thread 3b is provided in the upper part internal periphery, and an external thread 3c is provided in the bottom part, in a cylindrical body 3, while an external thread 4c is formed in a top end cylindrical body 4. Further through each angular hole 6 of each bottom plate 2a to 4a in the cylindrical bodies 2 to 4, a hollow core rod member 7 is vertically provided, and a ventilating hole 75 communicates with a ventilating path of the rod member 7. Compressed air is introduced in the hole 75 to lift the cylindrical body 4, and the threads 4c, 3b are screwed by a rotational part 72, thereafter by lifting the cylindrical body 3 to be screwed, extension and assembly of a strut are completed. Accordingly, extension and contraction can be automatized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a telescoping column device that can be automatically and smoothly extended and assembled, and shortened and folded.

[Conventional technology]

Traditionally, temporary scaffolding has been set up or cranes specifically designed for work at height have been used to carry out inspections of various elevated structures and other work such as photographing and lighting from high places. There is.

[Problem to be solved by the invention]

However, constructing temporary scaffolding requires land and time for assembly and disassembly, so it is not only not applicable in cases where there is not enough time, but also the time and effort involved in assembling and dismantling the scaffolding. However, due to the high cost, it is not economical.

On the other hand, when using specialized equipment such as a crane truck for aerial work, most of the 9-hour location problems can be solved, but such lane vehicles require extremely large equipment costs because of the specialized equipment. Furthermore, since the vehicle for such dedicated equipment is generally large in size, it is also heavy and lacks easy maneuverability.

The present invention is highly economical when used for conventional inspections, inspections, and construction at high places, as well as measurement, observation, photography, illumination, and monitoring of high places, as described above, and The object of the present invention is to provide a telescoping strut device that can exhibit light mobility.

[Means to solve the problem]

In order to solve the above problems, the present invention has a configuration in which a small-diameter cylindrical body is loosely inserted into a large-diameter cylindrical body, and.

In a telescoping column formed by connecting a plurality of cylindrical bodies of different diameters, in which the outer surface of the lower end of the cylindrical body of small diameter is airtightly connected to the inner surface of the upper end of the cylindrical body of large diameter, (a) Each cylindrical body is formed with a bottom, and the upper inner surface and the lower outer surface of each cylindrical body are
A connecting part is formed to connect each other in a male-female relationship, and the cylindrical body located at the lowest end of the column has a mechanism chamber connected to the lower surface of the bottom thereof, and (b) it can be shortened and stored. In this state, the lower surface of the bottom of each cylindrical body is formed so that compressed gas can be supplied to and discharged from the outside, and the small diameter cylindrical body and the large diameter cylindrical body inserted therein are (c) The extension assembly of the strut requires that compressed gas is supplied to the bottom surface of the small diameter cylindrical body, and that the small diameter cylindrical body Relatively positive rotation is applied between the inserted large-diameter cylinders in a preset order, and by supplying the compressed gas, the small-diameter cylinders are first rotated. It ascends inside the inserted large diameter cylinder, positions the lower outer surface of the smaller diameter cylinder on the upper inner surface of the larger diameter cylinder, and then By applying forward rotation, the outer surface of the lower end of the small-diameter cylinder and the inner surface of the upper end of the large-diameter cylinder are connected at the joint, and subsequently compressed gas is applied to the lower surface of the bottom of the large-diameter cylinder. The cylindrical body is raised by supplying the cylindrical body, and the above-mentioned operation is then repeated to sequentially connect and extend the cylindrical body starting from the small diameter side and assemble it into a column.

(d) Shortening and storing each cylinder in the extended and assembled strut provides relative reverse rotation between the large-diameter cylinder and the small-diameter cylinder, and also discharges the gas inside each cylinder. Accordingly, the coupling between the cylindrical bodies is sequentially performed from the cylindrical body on the large diameter side.

[For production]

The compressed gas supplied to each cylindrical body in the shortened and stored state acts on the lower surface side of the bottom of each cylindrical body sequentially from the small diameter side to the lower surface side of the bottom of each cylinder, and raises each cylindrical body sequentially from the small diameter side.

By applying relative rotation to each small-diameter cylindrical body that has been raised and each large-diameter cylindrical body that is inserted into the small-diameter cylindrical body, the inner surface of the upper end of the large-diameter cylinder and the small-diameter cylindrical body that has been raised first are rotated. The outer surface of the lower end is connected to the lower end by a male-female relationship between the two.

Thereafter, in the same way, the cylinders are raised by compressed gas supplied to the lower surface of the bottom of the cylinder sequentially from the cylinder on the small diameter side, and the lower end outer surface of each raised cylinder and the upper end inner surface of the next cylinder are the same as the split cylinder. Sequentially connected by relative rotation, each cylinder is elongated and assembled to the column.

In the strut assembled in an elongated manner, each cylindrical body is mechanically and firmly connected by the male-female relationship, and the strut as a whole maintains sufficient strength. Furthermore, by forming one airtight chamber as a whole and applying internal pressure with compressed gas, the strength of the entire column is reinforced.
Starting from the large diameter cylinder, relative reverse rotation is applied between the large diameter cylinder and the small diameter cylinder, and the compressed gas that was supplied earlier is gradually discharged from the vent hole. As a result, the struts that have been assembled in an extended manner are sequentially retracted from the large-diameter side of each cylindrical body into the cylindrical body that accommodates those cylinder bodies, and the struts are shortened and stored.

At this time, due to the cushioning effect of the compressed gas, the cylindrical body, which has been released from the male-female connection, is smoothly lowered and retracted.

Depending on the purpose, this plays an important role in ensuring safety when a large load is applied to the tip of the support.

〔Example〕

Next, an embodiment of the strut device of the present invention will be described with reference to the drawings.

Fig. 1 is a front cross-sectional view showing an example of the strut device of the present invention in a shortened storage state; Fig. 2 to Fig. 7 are front cross-sectional views of the prop device of the present invention in the extension and assembly process, respectively, and Fig. 8 is an example of the core rod. FIG.

In the figure, 1 is a basic cylindrical body with the largest diameter located at the lowest stage of the cylindrical body constituting the support device of the present invention,
In this embodiment, the bottom side has three bottom plates 1a, 1
Two hollow mechanism chambers 1d and 1a are formed by al 1 a II and the side wall member 11.

In the embodiment shown in Fig. 1, the base cylinder 1 is formed of a short cylinder with a short height, and although there is no internal thread provided on the inner peripheral surface of the upper end, it is formed of a cylinder with the same length as the other cylinders. It is optional to provide a female thread.

An intermediate cylindrical body 2 has an outer diameter that fits loosely within the inner diameter of the cylindrical body 1, and is formed to have a length such that the upper end sufficiently protrudes from the cylindrical body 1 when it is housed in the cylindrical body 1. A female thread 2b is formed on the inner periphery of the upper end of the cylindrical body 2 as an example of the female side of the coupling portion. Reference numeral 2a denotes the bottom of the cylindrical body 2, and 2d denotes a skirt-shaped tongue sealing material disposed around the lower end of the cylindrical body 2 to airtightly connect the outer surface of the cylindrical body 2 and the inner surface of the cylindrical body 1.

3 and 4 are cylindrical bodies forming the telescopic part of the strut device of the present invention, and among the cylindrical bodies 3 and 4, the intermediate cylindrical body 3 has the same inner and outer diameter and length as the cylindrical body 2 described above. It is formed. Therefore, in the figure, 3a is the bottom of this cylindrical body 3, and 3b is the bottom of the cylindrical body 3.
3c is a female thread formed on the inner circumferential surface of the upper end, male thread 3c is also formed on the outer circumferential surface of the lower end, and 3d is a skirt-shaped lip seal material attached below the male thread 3c.

The tip cylinder 4 forming the uppermost end of the strut device has, in this example, a configuration of its inner and outer diameters and length, as well as:
It has the same structure as the cylindrical body 2.3 described above in that it has a bottom portion 4a, a male screw 4c is formed on the outer peripheral surface of the lower end, and a skirt-shaped glue lug seal material 4d.

Here, the top end of the cylindrical body 4 is closed.

In this embodiment, a pedestal 5 which is detachably attached to the upper end of the cylindrical body 4 by screws or the like is hermetically fitted through an O-ring or the like, thereby closing the upper end of the cylindrical body 4. Note that the closed position is not limited to the upper end.

The pedestal 5 is used as a pedestal for mounting a camera, a light source for illumination, a measuring means, a workbench, an antenna, etc. on its upper surface.

In addition, the lip sealing materials 2d to 4d are provided as an example of a means for loosely inserting the cylindrical bodies into each other while maintaining airtightness on their inner and outer surfaces. It is optional to selectively apply a ring or other airtight sliding means.

Further, various screw shapes can be applied to the connecting portion, and in addition to screws, a connecting mode such as a key connection, a tapered connection, or a spiral thread can also be used.

Each of the cylindrical bodies 2 to 4 is housed in the basic cylindrical body 1 with the cylindrical body having a smaller diameter inserted into the cylindrical body having a larger diameter, thereby being shortened and stored as a support device. The state will be as follows. A thrust bearing 1f is provided on the bottom 1a between the top surface of the bottom 1a of the basic cylindrical body 1 and the bottom surface of the bottom 2a of the cylindrical body 2.

Each of the cylindrical bodies 2 to 4 described above is provided with a structure for transmitting relative rotational force so that the cylindrical body on the small diameter side is coupled to or separated from the cylindrical body on the large diameter side at the elevated position. This transmission structure is
- Consists of a square hole 6 and a core rod body 7, which will be described below as an example.

In the illustrated embodiment, square holes 6 of the same size and planar shape are formed in the center of the bottom portions 2a to 4a of each of the cylindrical bodies 2 to 4 when the cylindrical bodies are in the shortened storage state. This square hole 6
It is sufficient that the holes have any suitable non-circular shape, such as square, hexagonal, star-shaped, etc., but in this embodiment, they are formed in a square shape.

On the other hand, the basic cylindrical body 1
The mechanism chamber 1e is rotatably penetrated through the bottom plates 1a and la' via bearings 7a and 7b.

A hollow core rod body 7 is erected at 1d. This core rod 7
In the illustrated example, the fixed part 7 on the upper side on the same axis
1 and a lower rotating portion 72.

In addition, the core rod 7 has a length in which the effective length in the height direction does not exceed the upper end of the minimum diameter cylinder 4 in the stored state, and has the same external shape as the rectangular hole 6 whose external shape is quadrangular above the bottom 1a of the basic cylinder. , and a ventilation hole 75 is formed in the core rod 7 in the fixed part 71 immediately above the rotating part 72 .
It is formed in communication with

Here, the fixed part 71 and the flexible part 72 of the hollow core rod 7 are
The coaxial division structure and support structure are formed as follows, for example.

The fixing part 71 is formed of a square pipe body integrally with the core tube 71a at the upper part of the core tube 71a having a hollow round pipe shape, and has a shaft tube portion 72a having a round pipe shape outside the core tube 71a. A rotary part 72 made of a rectangular pipe having the same external shape as the fixed part 71 is fitted onto this. This rotating part 72 has bearings 7a and 7b in a shaft cylinder part 72a located below the bottom part 1a of the basic cylindrical body 1.
It is rotatably supported by the bottom portions la and la'. On the other hand, the lower end of the core cylinder 71a of the fixed part 71 is fixed to the bottom part 1a11 of the basic cylindrical body 1. Further, the ventilation hole 75 of the fixed part 71 is connected to an external compressed gas source via a ventilation path 74 such as a pipe. 76 is a second
It is a ventilation hole.

In the above, the height of the rotating part 72 is set to a height corresponding to the square hole 6 at the bottom of the cylindrical body 3 in the shortened storage state.

Note that the hollow portion penetrating the center of the core rod 7 is used as a passage for wires and the like. In addition, the ventilation path 74 is connected to the core tube 71.
It is also possible to use a itself or a groove formed therein.

In the above embodiment, the square hole 6 formed at the bottom of each cylindrical body 2 to 4 and the core rod body 7 inserted into the square hole 6 and erected in the mechanism chambers le and ld are different from each other. 4 as the base cylinder 1
Guides the small diameter cylindrical body to move in the extension direction with respect to the large diameter cylindrical body in the shortened and stored state, and holds this cylindrical body from rotating when the small diameter cylindrical body is raised. It forms an example of a structure for fixing and transmitting rotational force to a large-diameter cylindrical body.

In the figure, 8 is an input gear attached to the lower side of the shaft cylindrical part 72a of the rotating part 72 in the core rod 7 in the hollow mechanism chamber 1d formed in the cylindrical body 1, and 9 is an input gear that applies rotational force to the gear 8. A rotating machine for supplying the material, for example, formed by a geared motor, etc., and the rotating part 72 of the core rod 7 is rotated by the action of this rotating machine 9.
s 9 a is an output gear of the rotary machine 9 and meshes with the input gear 8.

In addition, power cords and control system electricity for various equipment such as cameras and antennas mounted on the pedestal 5.

A signal cable such as an optical signal passes through the hollow part of the core rod 7,
The tips of the cords, cables, etc., which are preferably arranged in advance, are provided with connection sockets, plugs, etc. on the pedestal 5, and the airtight chamber le side of the cylindrical body 1 is provided with an appropriate airtight seal, etc. It should be pulled out to the outside with or without intervention.

10 is a ventilation hole 75 of the core rod body 7. and a compressed gas supply/discharge system for selectively supplying and discharging compressed gas to the vent hole 76 provided in the bottom portion 1a of the cylindrical body 1; The supply pipe 10b connects to the ventilation passage 74 of the mechanism chamber 1e via the stop valves 10c, 10d, etc.
And, it is communicated with the ventilation hole 76 in the bottom part 1a of the basic cylindrical body 1.

An exhaust pipe 10e is connected, so that compressed gas is supplied and discharged between the compressed air source 10a and the inside of each cylinder. 10f is a stop valve for the exhaust pipe 10a;
It is assumed that tog is a main closing valve, and the supply system 10 is also provided with other necessary parts such as a pressure regulating valve. The compressed gas used is air.

Any type of gas may be used, such as inert gas or other pressurized gas, and liquids such as water may also be used.

In the present invention, the base cylindrical body 1 at the lowest end is not shown because it is a base member of the device of the present invention, but it is desirable to provide a stretchable or foldable leg member on the bottom surface thereof.

Each of the members 1 to 10 illustrated above constitutes an example of the prop device of the present invention.
This will be explained with reference to FIGS.

In the above-mentioned device of the present invention, each of the cylindrical bodies 2 to 4 is based on the basic cylindrical body 1, and the cylindrical bodies with smaller diameters are sequentially housed inside the larger diameter ones, so that the cylindrical bodies are in a shortened storage state. At this time, if there are power cords, signal cables, etc., they are wound up on the drum in the mechanism room.

When the strut device is in the above shortened storage state (Fig. 1),
In order to extend each cylindrical body and assemble it into a column, compressed gas is first supplied to the vent hole 75 of the core rod body 7.

The compressed gas supplied to the vent hole 75 is supplied to the lower surface side of the bottom portion 4a of the uppermost cylindrical body 4, so this cylindrical body 4
Under the action of the compressed gas supplied to the lower surface of the bottom portion 4a, that is, to the inside of the next cylindrical body 3, only the cylindrical body 4 is guided by the core rod 7 and raised to the position shown in FIG.

In the state shown in FIG. 2, when the rotating machine 9 applies normal rotation to the one-rotation unit 72, as shown in FIG. The inner surfaces of the upper ends of the two are connected by threading the female and male screws (see Fig. 3).

At the same time as the connection between the cylindrical body 3 and the cylindrical body 4 that has risen earlier is completed, compressed gas is supplied from the vent hole 76 to position the bottom portion 3a of the cylindrical body 3 above the vent hole 75 (see Fig. 4). ), compressed gas is supplied from the ventilation hole 75 of the core rod body 7 to the lower surface side of the bottom part 3a of this cylinder body 3, and the cylinder body 3 is raised to the state shown in FIG. is applied to rotate the cylindrical body 2 to connect the cylindrical bodies 3 and 2. (See Figure 6).

In this way, first, the cylindrical body 4 with the smallest diameter positioned at the tip of the column is screwed in an extended state to the next cylindrical body 3 in which the cylindrical body 4 is inserted, and then the cylindrical body 3 is , and is screwed in an extended state to the accommodated cylindrical body 2 with a large diameter, thereby completing the extension assembly of the support column device of the present invention in the embodiment. After joining, the gas between the bottom of the cylindrical body 2 and the bottom of the cylindrical body 1 is exhausted to create the state shown in FIG. 6.

In this way, each of the cylindrical bodies 2 to 4 is lifted by compressed gas, but the cylindrical bodies are mechanically and firmly connected to each other by the respective female and male threads.

In the embodiments shown in Figs. 1 to 6, the upper end of the basic cylindrical body 1 is not provided with a female screw, so the cylindrical body 2 is not screwed to the basic cylindrical body 1, but it is possible to screw the cylindrical body 2 to the basic cylindrical body 1. Forming is optional.

In addition, since the compressed gas supplied in this way maintains a state in which internal pressure is applied to the entire extended cylinder, each cylinder 2 to
4 are reinforced by the internal pressure they maintain in addition to the strength provided by the mechanical bond.

In addition, when each of the cylindrical bodies 2 to 4 is stretched and assembled, the threaded joints of each cylindrical body form a double wall, so that they act as if they were knots of bamboo, and the support of the present invention Further strengthens the buckling strength.

This shortened storage from the assembled state is carried out, for example, in the following manner.

First, in order to bring the cylindrical body 2 into the state shown in FIG.
The bottom part 2a is fitted into the rotating part 72 of the core rod 7 by supplying compressed gas from the cylindrical body 2, and in this state, the rotating machine 9 is reversed, and the cylindrical body 2 and the cylindrical body 3 above it are released.
Gradually exhaust the compressed gas. Here, gas is discharged from the inside of each cylinder 1 to 4 through the exhaust pipe 10e through the vent hole 75 of the core rod 7. When the cylinders 2 and 3 are uncoupled, the gas is discharged into the cylinder 2. The cylindrical body 3 remains connected to the cylindrical body 4 and falls softly while receiving the cushioning effect of the residual gas pressure. Due to this fall, the square hole 6 in the bottom portion 4a of the cylindrical body 4 fits into the fixing portion 71 of the core rod body 7. At this time, the square holes 6 at the bottoms of the cylindrical bodies 2 and 3 are located in the rotating part 72. (Refer to Fig. 4) In this state, the rotating part 72 of the core rod 7 is reversed and the cylindrical body 2 is rotated.
, 3, the cylindrical body 3 and the cylindrical body 4 are
Break the bond with.

Similarly, even if there are three or more cylindrical bodies.

By dropping each cylindrical body so that it is inserted into each cylindrical body in order from the large diameter side, the column of the present invention is automatically shortened and stored.

In the above embodiment, the bottom of the cylindrical body is connected to the ventilation hole 7 of the core rod 7.
5, compressed gas was supplied and discharged from the ventilation hole 76 to the lower surface of the bottom of the cylindrical body 2, and the bottom 2a was moved up and down.
Instead, a screw mechanism, a cylinder, or the like may be provided between the bottom 2a and the bottom 1a of the basic cylindrical body 1 in order to raise and lower the bottom 2a.

In addition, female and male threads are formed at the upper and lower ends of each of the cylindrical bodies 2 to 4 as male-female connection parts, but instead of such threads, for example, a shallow taper part (not shown) may be formed. Friction joint, or.

Instead of the female and male screws in the above example, a spiral strip, a circumferential groove, and a pin-shaped convex portion may be formed as the connecting portion of each cylindrical body.

Furthermore, in the above embodiment, the elongation assembly of each cylindrical body 2 to 4,
When shortened and stored, the bottom part 2a of each cylindrical body 2 to 4
In order to position the square hole 6 of ~4a on the rotating part 72 of the core rod 7, the core rod 7 is provided with a structure that allows it to move itself upwards, such as an elevating mechanism using a cam, a rack and pinion, a screw mechanism, a cylinder, etc. It may be added and installed upright.

By doing this, in the above embodiment, the bottom part 1 of the cylindrical body 1
The ventilation hole 76 provided in section a becomes unnecessary.

In the present invention, as a means for housing and holding the cylindrical bodies 1 to 4 in a mutually unrotatable manner without using the square hole 6 and the rotating part 72 and the fixed part 71 of the core rod body 7, the cylindrical bodies 1 to 4 are The cylindrical bodies may have a structure in which the cylindrical bodies are mutually restrained in the stored state, such as by fitting between the opposing surfaces of the bottoms in 4 or between the inner and outer surfaces of the peripheral wall at the lower end of each cylindrical body due to an uneven relationship. .

In this case, the core rod 7 has a structure that rotates as a whole, and the outer shape of the upper side is formed into a square shape that fits into the square hole 6 at the bottom of the raised small diameter cylinder, and the outer shape of the lower side is formed into the square hole 6. Form into a circle inscribed in .

The small-diameter cylindrical body described above has its bottom square hole 6 fitted into the square part of the rotating core rod, and is rotated in forward and reverse directions to connect or separate the small-diameter cylindrical body and the large-diameter cylindrical body.

In addition, the core rod 7 has a structure that does not rotate as a whole, and its outer shape is formed into a rectangular upper part and a circular lower part inscribed in this square hole, so that it functions as a lifting guide for each cylindrical body 4 to 2. The relative positive and reverse rotational forces applied between the cylindrical body and the large-diameter cylindrical body may be applied to the outer periphery of the large-diameter cylindrical body or the bottom 2a of the cylindrical body 2.

Furthermore, as an example of a structure that provides relative forward and reverse rotation between a raised small-diameter cylinder and a large-diameter cylinder without using the core rod 7, the height of the base cylinder 1 can be changed to the cylinder 2. The upper end of the cylindrical body 1 is formed to be at or slightly higher than the upper end thereof, and a structure is provided at the upper end of the cylindrical body 1 to selectively apply rotational force in the positive and reverse directions to each of the cylindrical bodies 2 to 4 from their outer peripheral surfaces, for example, in the positive direction. There is a structure in which something like a pinch roller to which reverse driving force is applied is provided on the circumference near the upper end of the basic cylindrical body 1 via a bracket or the like that is pressed against the outer surface of each cylindrical body. .

Further, the core rod 7 may have a structure in which it is coaxially divided into upper and lower fixed parts and a rotating part intermediate therebetween.

When the structure of the core rod 7 is changed from that of the embodiment shown in the figure, when each cylinder is connected and separated between the small-diameter cylinder and the large-diameter cylinder, the relative Whether the cylindrical body that is rotated forward or backward has a small diameter or a large diameter.
Or, the only difference is between the two.

〔Effect of the invention〕

Since the device of the present invention is as described above, by simply operating the switch that turns on and off the supply of compressed gas and the starting of the rotating machine, the device can automatically extend and fix the state, and can also be released from the extended state. It is possible to utilize the function of automatically shortening storage.

Therefore, a camera, a lighting lamp, an antenna, a measuring instrument, a workbench, etc. are mounted on a pedestal provided at the tip of the cylindrical body, which is the top end of this support, and the above-mentioned extension is performed.

If shortening is performed automatically, you can easily carry out photographing, lighting, measurement, and other tasks at or from high places without the need for temporary scaffolding or special cranes. In addition to the effect of being able to do this, it also has the unique effects described in the first section.

First, the device of the present invention lifts and lowers each cylindrical body by supplying compressed gas, but since each cylindrical body is mechanically and firmly connected at each joint, after being stretched and assembled to the support, the arrows, arrows, Even if there is a gas leak, there is no concern about the support strength of the pillars.

Next, each cylindrical body of the coaxial composite core rod provided in the device of the present invention rises due to the pressure of the compressed gas.

It serves as a centering guide when descending, and at the same time serves as a screwdriver for sequentially fitting and removing the upper and lower cylindrical bodies, which are threaded as an example of a coupling structure.

In addition, since the core rod is hollow as a whole, it also functions as a passage for power cords, communication cords, optical fiber cables, etc. that are connected to equipment such as photography and measurement that is attached to the tip of the support, making it a simple structure and multipurpose. can be assigned the role of

Next, the square hole provided at the bottom of each cylindrical body in the device of the present invention serves as a female hole for the screw driver action of the rotating part in the core rod, and the connecting part of each cylindrical body The bottom of the body acts as a deformation resistor, acting as a reinforcing section similar to bamboo nodes, preventing the long support from fully bending due to the load at the tip or wind pressure in strong winds.

In addition, in the device of the present invention, the pressure of the compressed gas required to push up each cylindrical body is almost constant because the lower cylindrical body, which supports more weight than the required cylindrical body, has a larger bottom area. , the cylindrical body can be easily raised and lowered.

In particular, in the device of the present invention, the compressed gas introduced into the lower surface side of the bottom of each cylindrical body acts on each cylindrical body in sequence when each cylindrical body is extended and assembled on a support, and raises each cylindrical body in sequence. In addition, when this column is shortened and stored, it acts as a buffer to prevent the upper part of the column from falling rapidly, and at the same time, by making adjustments such as increasing the gas pressure inside the column as appropriate, the cylinder It serves as a reinforcement to prevent the body from deforming, that is, to prevent the column from fully bending.

In short, the device of the present invention has an extremely simple structure, but it can simultaneously function to freely expand and contract long columns and effectively prevent full bending, which is a big problem with long columns that carry heavy loads. It is temporary.

Furthermore, since the cylindrical body that forms the main body of the device of the present invention has no protrusions or mechanical appendages on its outer shape, it can be made of lightweight and strong materials such as aluminum alloys and carbon fiber composites, making it easy to manufacture. At the same time, it is possible to reduce the weight of the entire device.

Therefore, it can be transported relatively easily by automobile, etc., and can be used for photographing or lighting from or to high places in narrow places where temporary scaffolding cannot be erected or where special crane trucks cannot enter. It is extremely convenient for performing various tasks such as , measurement, etc.

[Brief explanation of drawings]

FIG. 1 is a front cross-sectional view showing an example of the strut device of the present invention in a shortened storage state, FIGS. 2 to 6 are front cross-sectional views of the strut device of the present invention in the extension assembly process, and FIG. 7 is an example of the core rod. FIG. 1... Basic cylindrical body, 2, 3... Intermediate cylindrical body, 4...
・Minimum diameter cylindrical body, 18-4a...bottom, 2b, 3b・
...Female thread, 20-4C...Male thread, 2d-4d...
・Lip seal material, ld, la...mechanism room, 5...
Pedestal, 6...Square holes in bottom parts 1a to 4a, 7...Air passage, 75...Vent hole, 8...Input gear, 9...Rotating machine, 10...Compressed gas supply Exhaust system diagram 1

Claims (1)

[Scope of Claims] 1. A small-diameter cylindrical body is tightly and loosely inserted into a large-diameter cylindrical body, and the lower end outer surface of the small-diameter cylindrical body is connected to the upper end inner surface of the large-diameter cylindrical member in an airtight manner. (a) Each cylinder is formed with a bottom, and the inner surface of the upper end and the outer surface of the lower end of each cylinder have male and female male and female rods connected to each other. A connecting part is formed by the relationship, and the cylindrical body located at the lowest end of the column has a mechanism chamber connected to the lower surface of the bottom thereof; (b) In the shortened and stored state. The lower surface of the bottom of each cylindrical body is formed so that compressed gas can be supplied to and discharged from the outside, and the small-diameter cylindrical body and the large-diameter cylindrical body into which it is inserted rotate relative to each other. (c) The extension assembly of the strut requires that compressed gas is supplied to the lower surface of the bottom of the small-diameter cylindrical body, and that this is inserted into the small-diameter cylindrical body. By applying the relative positive rotation between the large-diameter cylindrical bodies inside the cylinders in a preset order, the compressed gas is supplied to first rotate the small-diameter cylindrical bodies inside the cylinders. The inserted large-diameter cylinder is lifted up and the lower end outer surface of the small-diameter cylinder is positioned on the upper end inner surface of the large-diameter cylinder. By applying rotation, the outer surface of the lower end of the small-diameter cylinder and the inner surface of the upper end of the large-diameter cylinder are connected at the joint, and compressed gas is subsequently supplied to the lower surface of the bottom of the large-diameter cylinder. By doing so, this cylindrical body is raised, and the above-mentioned operation is repeated to sequentially connect and extend the cylindrical body from the small diameter side and assemble it into a column. The cylinder on the large diameter side A telescoping support device characterized by the following: The movement is performed sequentially starting from the body. 2. In order to relatively rotate the large-diameter cylinder and the small-diameter cylinder and connect and separate both cylinders, a square hole is provided at the bottom of each cylinder, and a cross-sectional outer shape that is approximately the same as that of the square hole is provided. A core rod having a rotary part and a fixed part coaxially divided in the length direction and having a ventilation passage and a ventilation hole formed therein is passed through the square holes in each of the bottom parts of the lowermost cylindrical body. The telescopic support device according to claim 1, characterized in that it is installed upright in a mechanism room. 3. A large-diameter cylindrical body and a small-diameter cylindrical body that are connected or separated by supplying compressed gas to the bottom of the cylindrical body inserted into the lowermost cylinder. 3. The telescopic strut device according to claim 2, wherein the bottom of one or both of the small-diameter cylindrical body and the small-diameter cylindrical body are positioned in the rotating part of the core rod. 4 A large-diameter cylindrical body and a small-diameter cylindrical body that are connected or separated by mechanically moving up and down the bottom of the cylindrical body inserted into the lowermost cylindrical body. 3. The telescopic strut device according to claim 2, wherein the bottom of one or both of the small-diameter cylindrical body and the small-diameter cylindrical body are positioned in the rotating part of the core rod. 5. In order to connect or separate a large diameter cylinder and a small diameter cylinder, the core rod is moved upward or downward to connect or separate one or both of the large diameter cylinder and small diameter cylinder. 5. A telescoping strut device according to any one of claims 2 to 4, characterized in that the bottom portion is positioned at the rotating portion of the core rod. 6. A patent claim in which a large-diameter cylinder into which a small-diameter cylinder is inserted is rotated together with each large-diameter cylinder in order to connect or separate the large-diameter cylinder and the small-diameter cylinder. A telescoping strut device according to any one of Items 1 and 2 to 5. 7. The telescopic strut device according to claim 6, wherein an external rotational force transmission structure is provided on the outer peripheral surface of the cylindrical body in order to connect or separate the large-diameter cylindrical body and the small-diameter cylindrical body.