JPH02159404A - Freely expandable support device - Google Patents

Abstract

PURPOSE:To attempt to exhibit economical and convenient mobile power by utilizing the helix of a core rod body, the helical hole on the bottom of each cylindrical body screwed in the helix, connection between a concave part on the top of the core rod body and key members of the helical hole, a key slot on the periphery of the bottom part of each cylindrical body and a convex ridge on the inner surface of each cylindrical body. CONSTITUTION:A cylindrical body 6 is lifted up by the prevention of its rotation due to the rotation of a core rod body 9 and the engagement of a key slot 6d with a convex ridge 5e, as the helical hole 8 of a cylindrical body bottom part 6a on the support extreme highest edge is engaged with a helical pillar-shaped part 9b when the core rod body 9 rotates forward. That is, the cylindrical body 6 is lifted up along the convex ridge 5e, but the convex ridge 5e is cut off at the lowest edge of a female screw 5b, and a helical pillar-shaped part 92b on the upper half side located at the height of the rod lever body 9 is spline-connected with a pillar-shaped part 91b on the lower half side, and as a concave part 9c is formed part 91b on the lower half side, and as a cocave part 9c is formed in a specific position, the cylindrical body 6 which is lifted up rotates in one body with the core rod body 9 as a key member 81b of the helical hole 8 is fitted a concave part 9c. With this rotation, a male screw 6c on the bottom edge of the cylindrical body 6 starts to helically fit in the female screw 5b on the upper edge of the cylindrical body 5 and the peripheral upper face of a bottom part 6a reaches the female screw 5b to complete the process.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is applicable to, for example, bridges, steel towers, expressways, Dal. Scaffolding, supports, and street lights for various work such as inspection, inspection, and repair of elevated structures such as buildings, elevated power line 2 power generation equipment, chemical plants, steel plants, oil tanks, gas tanks, and liquefied gas tanks. ,? l! Scaffolding for construction work, maintenance work, aerial radio waves, meteorological measurements, etc.
Scaffolds and props for ecological observation of plants, animals, etc., props for photographing various sports competitions, various events, schools of fish, ranches, farms, marine ranches, panoramic views of factories, resort areas, etc. from high places. The present invention relates to a telescoping support device useful for use as a support for lighting at golf courses, etc., and for temporary structures such as tents and fences.

[Conventional technology]

Traditionally, it has been used to perform various tasks such as inspections of various elevated structures and other high places, as well as to perform photography and lighting from high places.

Temporary scaffolding has been set up and cranes specifically designed for work at heights are being used.

[Problem to be solved by the invention]

However, setting up 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 one scaffold. , since the cost increases, economic efficiency, 1
There is a problem with this being lacking.

On the other hand, when using specialized equipment such as a crane truck for working at heights, most of the location and two-hour problems can be solved, but since such lane vehicles are specialized equipment, the equipment cost is extremely high. Furthermore, since the vehicle for such dedicated equipment is generally large in size, it is also heavy and lacks easy maneuverability.

INDUSTRIAL APPLICABILITY The present invention is highly economical when used in conventional inspections, inspections, factories, measurements at high places, i-measurements, photography from high places, illumination, monitoring, etc., as described above. The object of the present invention is to provide a telescoping strut device that can provide easy mobility.

[Means to solve the problem]

The structure of the present invention for solving the above problems is (a)
The small-diameter cylindrical body is loosely inserted into the large-diameter cylindrical body one after another, 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 body into which the cylindrical body is loosely inserted. In a telescopic column consisting of a plurality of cylindrical bodies of different diameters, (b) a connection that is connected to and separated from the inner surface of the upper end and the outer surface of the lower end of each intermediate cylindrical body located in the middle of the column by means of female and male screws; (c) Each of these intermediate cylindrical bodies has a bottom portion of such size that the outer circumference of the bottom portion fits within the inner diameter of the cylindrical body in which each cylindrical body is received. The cylindrical body is shaped like a flange, and has a bottom with a vertical keyway on the outer periphery of the flange-like part. (d) forming a convex strip extending in parallel and loosely fitting into the keyway provided on the outer periphery of the bottom below the female screw to a point below the vertical width of the screw; The cylindrical body located at the upper end has a bottom similar to the bottom of the intermediate cylindrical body, has a mounting seat at the upper end, and has a male screw part on the outer surface of the lower end that is equivalent to the vertical width of the threaded part of the intermediate cylindrical body. In addition, the cylindrical body located at the lowest end of the column forms a mechanism chamber on the lower surface of its bottom, and has a female threaded portion similar to the intermediate cylindrical body on the inner surface of the upper end of the cylindrical body, and also has a female threaded portion in the height direction. (e) In a state where each of the above-mentioned cylindrical bodies is inserted into a cylindrical body with a large diameter in order from the smallest diameter cylindrical body, a convex strip is formed on the inner surface of each cylindrical body, and a convex strip is formed on the bottom of each cylindrical body, (f) a cylindrical body that becomes the uppermost end of the support when each cylindrical body is inserted in sequence; The part of the cylindrical body located below the bottom hole of the cylindrical body has a circular cross section with an outer diameter inscribed in each of the bottom holes, and R is the part located above this circular cross section. The rod has a male or female spiral screwed into the bottom spiral in the part excluding the top end, and a recess in the top end into which the bottom key member is fitted, and the rod has a high height. Insert a core rod formed so that it is located approximately directly below the upper end of the cylindrical body, which will become the top end of the support, into the hole at the bottom of each cylinder, and insert this core rod into the hole that will become the bottom end of the support. It should be installed rotatably in the mechanism chamber of the cylindrical body.

(g) When a rotational force is applied to the core rod and the core rod is rotated in the forward direction, the cylindrical body that becomes the uppermost end of the column is supported by the convex strip on the inner surface of the cylindrical body, into which the keyway on the outer periphery of the bottom is inserted. As a result, the cylindrical body is sent into the spiral of the rotating core rod in a non-rotatable state and rises, and at the point where the ridge disappears, the key member provided in the hole at the bottom enters the concave part of the core rod. When the cylindrical body is fitted and rotates together with the core rod, the male thread formed on the outer surface of the lower end of the cylindrical body is screwed into the female thread on the inner surface of the upper end of the cylindrical body into which the cylindrical body is inserted. As these two screws are screwed together, they further rise, and the flange-like portion on the outer periphery of the bottom abuts the female screw, stopping the integral rotation with the core rod, completing the threaded connection of the circumferential cylindrical body.

As the above two screws are screwed together, the next cylindrical body rises, and the hole at its bottom is guided by the spiral of the core rod, and begins to rise without rotating, and at the top of the core rod, the inner surface of the upper end of the next cylinder The male thread on the outer surface of the lower end of the cylindrical body that has ascended is screwed into the female thread of (h) When the core rod in the extended and assembled state is reversely rotated, the core rod is connected to the cylindrical body screwed to the cylindrical body located at the lowest end of the strut in order. The threaded connection between each cylindrical body is released by reverse rotation of the rod, and the cylindrical body is shortened and folded by being guided by the core rod and descending on the inner surface of the large diameter cylindrical body. It is.

[For production]

A spiral formed in the core rod, a spiral hole formed in the bottom of each cylindrical body screwed into the core rod, and a recess formed in the upper part of the core rod and a spiral hole in each cylindrical body that can be freely retracted. The combination of the key members, the key groove formed on the bottom outer peripheral surface of each cylindrical body, and the protrusion formed on the inner surface of each cylindrical body excluding the upper part to loosely fit and guide this key groove, the above-mentioned Core rod positive.

The reverse rotation causes each cylindrical body to perform a non-rotatable lifting motion and a rotational motion for threaded connection at the end of the ascent and the beginning of the descent.

Therefore, in each of the cylindrical bodies inserted into each other, the female and male screws formed on the inner surface of the upper end and the outer surface of the lower end of each cylindrical body are connected to each other at the rising end of each cylindrical body, and the key groove on the outer periphery of the bottom part and the convex strip on the inner surface of the cylindrical body have free play. At the same time as the fitting relationship is removed, the concave portion on the upper part of the core rod and the key member of the spiral hole are fitted, and the cylindrical body that has risen and rotates integrally with the core rod is rotated to be screwed together.

In each cylindrical body whose female and male threaded parts are connected and extended and assembled on the support column, the core rod rotates in the opposite direction, so that
The female thread of the cylindrical body at the lowest end of the support and the male thread of the next cylindrical body connected to the cylindrical body are unscrewed, and the cylindrical body is guided by the spiral of the core rod that rotates in the opposite direction and descends. , is inserted into a cylindrical body with a large diameter, and then cylindrical bodies with a smaller diameter are sequentially lowered and inserted into the cylindrical body with a larger diameter, thereby shortening and folding the strut.

〔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 the main parts of an example of the strut device of the present invention;
FIG. 2 is a front cross-sectional view showing an example of the structure of the intermediate cylindrical body in the device of the present invention, FIG. 3 is a bottom view of FIG. 2, and FIG. 4 is a cross-sectional view showing an example of the relationship between the core rod and the bottom of the cylinder. It is a diagram.

In the figure, 1 is a basic cylindrical body having the maximum diameter and positioned at the lowest stage of the cylindrical bodies constituting the support apparatus of the present invention, and in this embodiment, its bottom is formed by two bottom plates 1a and 1.
A' is formed into a double mechanism chamber 1f and Ig,
Further, a female thread 1b is formed on the inner circumferential surface of the upper end, slightly protruding from the inner surface, and having an appropriate vertical width as an engaged portion. In this embodiment, the threaded portion is formed and attached as a separate member from the cylindrical body, but it may be formed integrally with the cylindrical body by cutting it out. 1e is a protrusion formed on the inner surface of the cylindrical body 1 in the height direction.

2 is one of the intermediate cylindrical bodies having an outer diameter that fits loosely inside the inner diameter of the cylindrical body 1, and having a length such that the upper end slightly protrudes from the cylindrical body 1 when it is housed in the cylindrical body 1; A female thread 2b similar to the female thread 1b is formed on the inner periphery of the upper end of this cylindrical body 2, while a female thread 2b similar to the female thread 1b is formed on the outer periphery of the lower end of the cylindrical body 1.
A male screw 2c is formed to be screwed into the female screw 1b.

Reference numeral 2a designates the bottom of the cylindrical body 2. The outer periphery of the bottom 2a is formed into a flange that slightly protrudes from the top of the male thread 2c, and a vertical keyway 2d is formed in this flange.

On the other hand, on the inner surface of the cylindrical body 2, extending in the height direction,
A protruding strip 2e is formed in which the upper part is cut out by a length approximately twice the vertical width of the threaded portion 2b.

3 to 6 in the figure are other cylindrical bodies forming the strut device of the present invention, and among these cylindrical bodies 3 to 6, intermediate cylindrical bodies 3 to 5 are
are formed so that their inner and outer diameters and lengths have substantially the same relationship as the relationship between the cylindrical bodies 1 and 2. Therefore, in the figure, 3a to 5a are the bottom of each cylinder, 3b to 5b
30 is a female screw formed on the inner peripheral surface of the upper end of each cylindrical body 3 to 5;
〜5c is a male screw similarly formed on the outer peripheral surface of the lower end, 3d〜5
d is a key groove formed on the outer peripheral surface of each bottom portion 3a to 5a; 2e;
~5e is the keyway 3 in the height direction of the inner circumferential surface of each cylinder.
d to 6d are formed to loosely fit each protrusion 2e.
-5e have their upper parts cut out to match the vertical widths of the threads 3b-5b.

The tip cylindrical body 6 forming the uppermost end of the strut device of the present invention has a configuration of its diameter and length, and a bottom portion 6a, and
It has the same configuration as each of the previous cylindrical bodies 3 to 5 in that a male screw 6c is formed on the outer circumferential surface of the lower end and has a keyway 6d, but it has a unique configuration in that no convex stripes are formed on the inner surface. .

That is, here, the upper end of the cylindrical body 6 has female and male screws 6b and 7.
The upper end of the cylindrical body 6 is closed by fitting the pedestal 7 which can be freely attached and detached by means such as a.

In the above, the female I-threads 1b-6b, 2c-6c formed on the inner and outer circumferential surfaces of the upper and lower ends of each of the cylindrical bodies 1-6 are sufficient as long as they can realize a coupling relationship similar to screws.

For example, a spiral protrusion and a groove into which the protrusion fits are sufficient.

The pedestal 7 is used as a pedestal for mounting a camera, a light source for illumination, a measuring means, a workbench, etc. on its upper surface.

Each of the above-mentioned cylindrical bodies 1 to 6 is brought into a shortened and folded state as a strut device by having a cylindrical body with a smaller diameter inserted into a cylindrical body with a larger diameter.

Each cylindrical body 1 to 6 is in the shortened state.
A spiral hole 8 having the same size and shape is formed on the inner surface at the center of the bottom portions 1a to 6a of the bottoms 1a to 6a. The spiral of the spiral hole 8 has a male-female relationship with a spiral formed on the outer surface of the core rod 9, which will be described later. Note that the pitch of the spiral is arbitrary.

Here, as an example of the spiral hole 8, it is convenient to use a ball nut 81 shown in FIG. 4. In this pole nut 81, a key member 81b having a spherical tip is provided at the upper part thereof, and a spring 81c is applied from the rear so that the key member 81b functions as a key that fits into a recess 9C of a core rod 9, which will be described later. 81a is a steel ball.

Reference numeral 9 denotes a hollow core rod rotatably installed on the second bottom plate 1a' of the lowermost cylindrical body 1 so as to pass through each of the spiral holes 8 in each of the cylindrical bodies 1 to 6 in the inserted state. It is.

The outer periphery of the lower part of the core rod 9 corresponding to the bottoms 1a to 6a of the respective cylindrical bodies 1 to 6 in the inserted state is the spiral hole 8.
It is formed into a cylindrical portion 9a with an outer diameter inscribed in the cylindrical portion 9a, and a portion above this cylindrical portion 9a is formed into a helical columnar portion 9b which is screwed into the helical hole 8. When the spiral hole 8 is a pole nut 81, this spiral columnar part 9b is a ball screw into which the pole nut 81 can be screwed.

Here, the spiral columnar part 9b is one in which the spiral columnar part 92b on the upper half side is joined to the spiral columnar part 91b on the lower half side by a spline connection 93b etc. so that only upward sliding is possible, and , on the outer surface of the columnar portion 9b,
A recess 9c into which a key member 81b formed in the spiral hole 8 in each bottom 28 to 6a fits is formed in a portion corresponding to the mutual screw connection position of each of the cylindrical bodies 2 to 6.

The spiral columnar part 9b is connected to the upper and lower halves 92 by spline connection.
b, 91b are formed separately so that each spiral hole 8 in each bottom part 28 to 6a of each ascending cylindrical body is formed in the bottom part of each cylindrical body on the upper half spiral columnar part 92b side. When reaching the correspondingly provided recesses 9c, the key members 81b at the bottom, which act as keys, fit into the recesses 9c, which act as key grooves, respectively, and each cylindrical body 2- 6 is rotated integrally with the core rod body 9 each time, and the female and male screws 1b to 6c of each of the cylindrical bodies 2 to 6 are screwed together.

Here, each cylindrical body 6-2 is raised in order by the action of the core rod 9, and the key member 81 in the spiral hole 8 of each bottom part 68-2a. b is fitted into the corresponding recess 9C, and each cylindrical body 6-2 sequentially starts to rotate integrally with the core rod 9 (that is, when the male thread 60-2c on the outer surface of the lower end of each cylindrical body 6-2 is 1 In order to ensure this screwing (when sequentially starting to screw the internal threads 5b to 1b on the inner surface of the upper end of the cylindrical bodies 5 to 1), the entire core rod 9 or the helical columnar part 92b on the upper half side of the core rod 9 is It is desirable to raise it slightly.

As this lifting means, for example, a stroke operation using a timing-operated lifting cam, a small cylinder, etc. is used. In addition, the operation timing is determined from each bottom 58 to
The timing at which the key member 81b in the spiral hole 8 of 2a fits into each recess 9c is set by, for example, detecting the number of rotations of the core rod 9.

The height of the core rod 9 is adjusted so that the bottom 2a of the cylindrical body 2 in the extended and assembled state can be maintained in a state where the bottom part 2a of the cylindrical body 2 is fitted into the spiral columnar part 9b of the core rod 9 in the spiral hole 8. It is being still.

If a hollow hole is formed in the center of the core rod 9, it can be used as a passage for a wire, etc., which will be described later.

Here, the spiral of the spiral columnar part 9b is formed by standing up the cylindrical part 9a with the same external shape, and forming protrusions on the outer surface of the raised cylindrical part having a pitch that is screwed into the spiral hole 8. It may also be formed by wrapping the body.

The core rod body 9 is the two bottom plates 1a of the cylindrical body 1.

la' via bearings 10.11 so as to be rotatable.

12 is a worm wheel attached to the core rod 9 in the mechanism chamber 1f formed in the cylindrical body 1; 13 is a rotating machine that supplies rotational force to the wheel 12; for example, it is formed by a geared motor or the like; Warm 1
4 is meshed with the worm wheel 12,
By the action of this rotary machine 13, forward and reverse rotations are selectively applied to the core rod 9.

15 has an upper end fixed to the lower surface of the pedestal 7 in the cylindrical body 6, and a lower end side to the core rod body 9 through the center of each cylindrical body.
The second mechanism chamber 1g of the cylindrical body 1 is
A guide cable made of a string, wire, etc. is wound around a winding drum 16a disposed in the guide cable 15, and this cable 15 is used to pull each cylindrical body 6-2 downward as necessary during folding and shortening. By rotating the winding drum A16a by a rotating machine 16 such as a motor, the winding and unwinding are performed.

In addition, power cords for various equipment such as cameras mounted on the pedestal 7, signal cables for control system electricity, light, etc.
Similarly to the guide cable 15, it is desirable that the guide cable be placed in advance through the hollow portions of each cylinder and the core rod 9. The tip of this cord, cable, etc. is provided with a connection socket, plug, etc. on the pedestal 7, and the mechanism chamber 1g side of the cylindrical body 1 for this cord, etc. is also connected to the outside via a socket, plug, etc. after passing through the drum 16a. Make sure to pull it out.

Each of the above-mentioned members 1 to 16 constitutes an example of the prop device of the present invention, so an example of its operation will be described next.

In the device of the present invention, when each of the cylindrical bodies 1 to 6 is brought into a shortened folded state by sequentially inserting the small diameter one into the large diameter one with the cylindrical body 1 as a base, the guide cable 15 is installed, this cable is attached to the drum 16
It is wound up on a.

If a signal cable or the like is arranged together with this cable 15, this cable or the like is also wound up together.

When the strut device is in the above-mentioned folded state, the rotary machine 13 is rotated forward, for example, in order to extend each cylindrical body and assemble it into the strut.

Even if the rotating machine 13 rotates forward, each of the cylindrical bodies 1 to 5.

The spiral holes 8 (pole nuts 81 in the embodiment shown in FIG. 4) of the bottom portions 1a to 5a thereof are circumscribed to the cylindrical portion 9a of the core rod 9 rotated by the rotating machine 13, and
Since the key grooves 2d to 6d provided on the outer circumferential surface of each of the bottom parts 1a to 6a are fitted to the protrusions 1e to 5e of the inserted cylindrical bodies, the cylindrical bodies 2 to 5 do not rotate. .

However, when the core rod 9 rotates forward, the spiral hole 8 in the bottom 6a of the cylindrical body 6 located at the uppermost end of the column
Since the cylindrical body 6 is fitted into the spiral columnar part 9b, the cylindrical body 6 is rotated by the rotation of the core rod 9 and the rotation prevention effect caused by the keyway 6d fitting into the protrusion 5e. First, it will be raised.

The cylindrical body 6 has a spiral columnar part 91b on the lower half side of the core rod body 9.
The upper end of the male thread of the cylindrical body 6 rises along the convex line 5e, but the convex line 5e on the inner surface of the cylindrical body 5 is guided by the cylindrical body 5.
The helical columnar part 92b on the upper half side located at this height of the core rod 9 is spline connected to the columnar part 91b on the lower half side 93b. In addition, since the recess 9c is formed at a predetermined position, the cylindrical body 6 that has risen will be able to reach the key member 81b of the spiral hole 8 (pole nut 81) in the bottom 6a.
is fitted into the four parts 9c and rotates together with the core rod 9, and as a result of this rotation, the male screw 6c on the outer surface of the lower end of the cylindrical body 6 starts to be screwed into the female screw 5b on the inner surface of the upper end of the cylindrical body 5. The threading of both screws 6c and 5b is completed when the outer peripheral upper surface of the bottom 6a having the keyway 6d in the cylindrical body 6 reaches the female screw 5b.

When the screws 6c and 5b are screwed together in this way,
The cylindrical body 6 that has just risen and the next cylindrical body 5 to which the cylindrical body 6 is screwed are integrated at the screwed joint, and in this state, the spiral hole 8 (
The pole nut 81) is the spiral columnar part 9 on the upper half side of the core rod 9.
Since it rises slightly due to 2b, the connected circumferential cylindrical bodies 6, 5
The rotation of the core rod 9 is controlled by the spiral hole 8 (
At the same time, it continued to rise in response to the impact of Paul Nats 81).

In this way, first, the cylindrical body 6 with the smallest diameter positioned at the tip of the column is screwed in an extended state to the next cylindrical body 5 in which that cylindrical body 6 is inserted, and thereafter, sequentially each day. Cylindrical bodies 5 to 2 are inserted into each cylindrical body 4 to 1, respectively.
By screwing them together in the extended state, the extension assembly of the strut device of the present invention is completed.

At this time, each of the cylindrical bodies 2 to 6 has its bottom 2a to 6a
are located at the joints of each cylindrical body in the stretched and assembled state, so they act like bamboo nodes, reinforcing the buckling strength of the strut of the present invention.

Here, when the extension assembly is completed, the core rod 9 is in a state in which the recess 9c in the upper spiral columnar body 92b is fitted into the key member 81b of the spiral hole 8 (pole nut 81) in the bottom 2a of the cylindrical body 2. It is in.

Further, the guide rope 15 is let out from the drum 16a as each cylindrical body rises, and is fed out from the bottom surface of the pedestal 7 to the winding drum 1.
It is in a stretched state up to 6a.

Folding from this assembled state is carried out, for example, in the following manner.

When the rotary machine 13 is reversed, due to the reversal action of the core rod 9, the cylindrical body 2 first begins to rotate integrally with the core rod 9 while connecting the other cylindrical bodies 3 to 6.

The male thread 2c rotates so as to be detached from the ring thread 1b of the cylindrical body 1, and at the same time descends by the amount of the coupling thread, whereby the keyway 2d fits into the protrusion 1c, thereby causing the spiral hole 8 of the bottom 2a. is guided by the spiral of the spiral columnar part 9b of the core rod 9 and descends within the cylindrical body 1.

When the cylindrical body 2 descends into the cylindrical body 1 and its bottom 2b abuts the bottom 1b, the spiral hole 8 in the bottom 2a is in a free state circumscribing the lower cylindrical part 9a of the core rod 9. . Incidentally, since the keyway 2d remains fitted into the protrusion 1e, the cylindrical body 2 does not rotate.

When the cylindrical body 2 completes the above-mentioned lowered and retracted state, the key member 81b of the helical hole 8 in the bottom part 3a of the next cylindrical body 3 is moved into the recessed part of the helical columnar part 92b on the upper half side of the core rod 9 at the same time. 9c and receives the action of reverse rotation of the core rod body 9, the screw connection with the cylinder body 2 is released while the key groove 3d of the cylinder body 3 does not fit into the protrusion 2e, and this screw connection is released. When the keyway 3d is unwound, the keyway 3d is fitted into the protrusion 2e, and the cylindrical body 3 is sent downward inside the cylindrical body 2 in a non-rotatable state due to the reverse rotation of the core rod body 9, and the cylindrical body 2 It will be descended and interpolated into the .

Thereafter, similarly, the cylindrical bodies 4 to 6 are sequentially lowered so as to be uncoupled from each cylindrical body 3 to 5 and inserted into each cylindrical body by reverse rotation of the core rod body 9. The strut of the present invention is automatically shortened and retracted.

Incidentally, when lowering and shortening each cylindrical body, the shortening operation of each cylindrical body may be facilitated by winding up the guide cable 15 onto the drum 16a.

In the above embodiment, the upper and lower ends of each of the cylindrical bodies 1 to 6 are provided with separately formed female and male threads 1 as engaging parts and engaged parts.
b to 5b and 2c to 6c are attached to form a threaded portion, but instead of such screws, the threaded portion may be molded integrally with the cylindrical body.

In addition, in the core rod 9, the upper end of the spiral columnar part 92b on the upper half side of the spiral columnar part 9b is formed such that the outer circumference of the upper end is slightly narrower or the upper end is formed in a hemispherical shape. 6～
It is desirable that the spiral holes 8 in each of the bottom parts 6a to 2a facilitate insertion of the columnar part 9b when the columnar part 9b is lowered and shortened.

〔Effect of the invention〕

As described above, the device of the present invention automatically extends and fixes the state by simply operating the switch that turns on and off the rotating machine, and also automatically shortens and retracts from this extended state. You can perform the functions you are capable of.

Therefore, a camera, a light source for illumination, a workbench for the measuring instrument 1, etc. are mounted on the pedestal 7 provided at the tip of the cylindrical body 6, 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 following unique effects.

First, the rotating core rod provided in the device of the present invention plays the role of transmitting the feed driving force and serving as a feed guide when each cylindrical body ascends and descends, and at the same time serves as a feed guide for the upper and lower threaded cylindrical bodies. It plays the role of a screwdriver to sequentially engage and disengage the parts.

Furthermore, by forming the core rod hollow, it also functions as a passageway 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 column. can be made to take charge.

Next, the spiral hole formed at the bottom of each cylindrical body in the apparatus of the present invention serves as a feeding guide for the core rod and a female hole that receives a screw driver action, and at the same time serves as a cord passing through the center of the support. The bottom of each cylinder also acts as a passageway for.

Prevents the ecology of long pillars due to the load at the tip and wind pressure during strong winds ■
It plays the role of a reinforcing part similar to bamboo knots.

In summary, the device of the present invention has an extremely simple structure, but it is revolutionary in that it can simultaneously function to freely expand and contract long columns and effectively prevent ecological problems that are a big problem with long columns that carry heavy loads. It is something like that.

Furthermore, the cylindrical body that forms the main body of the device of the present invention is made of lightweight and strong materials such as aluminum alloys and carbon fiber composites, and there are no protrusions on the outside! I! i! In addition to being easy to construct, the entire device can be lightweight, so it can be transported relatively easily by automobile, etc., and it cannot be used in narrow spaces where temporary scaffolding cannot be erected or where special crane trucks cannot enter. It is extremely convenient for performing various tasks such as photographing, illuminating, and measuring from or to a high place.

[Brief explanation of the drawing]

FIG. 1 is a front cross-sectional view showing the main parts of an example of the strut device of the present invention;
FIG. 2 is a front view showing an example of the configuration of the intermediate cylindrical body in the device of the present invention, FIG. 3 is a bottom view of FIG. 2, and FIG. 4 is a sectional view showing an example of the relationship between the core rod and the bottom of the cylinder. It is. 1... Maximum diameter cylindrical body, 2 to 5... Intermediate cylindrical body,
6... Cylindrical body with the smallest diameter, 1a to 6a... Bottom, 1b
~6b...female thread, 2c~6C...male thread, 2d~
6d...Key groove, 1e-5e...Convex strip, 7...Pedestal 58...Spiral hole, 81b...Key member, 9...
Core rod, 9a... Cylindrical part, 9b... Spiral columnar part,
91b...lower half of the spiral columnar part, 92b...upper half of the spiral columnar part, 9c...recess, 10.11...bearing, 12...worm wheel, 13...rotation machine,
14... Worm, 15... Guide rope, 16...
・Rotating machine, 16a... Winding drum Fig. 2b

Claims (1)

[Scope of Claims] (a) A small-diameter cylindrical body is loosely inserted into a large-diameter cylindrical body in sequence, and the lower end outer surface of the small-diameter cylindrical body and the upper end of the large-diameter cylindrical body into which the cylindrical body is loosely inserted (b) In a telescopic column consisting of a plurality of cylindrical bodies of different diameters, each of which is located in the middle of the column, the inner surface of the upper end and the outer surface of the lower end of each intermediate cylinder are provided with male and female threads. (c) The bottom of each of these intermediate cylindrical bodies is such that the outer periphery of the bottom is the same as that of the cylindrical body in which each cylindrical body is inserted. Each cylindrical body has a flange shape large enough to fit within the inner diameter, and has a bottom with a vertical keyway on the outer periphery of the flange. A convex strip extending from the bottom parallel to the height direction of the cylindrical body and loosely fitting into the key groove provided on the outer periphery of the bottom is formed below the female screw to the bottom excluding the vertical width of the screw. to do,
(d) The cylindrical body located at the uppermost end of the support has a bottom similar to the bottom of the intermediate cylindrical body, has a mounting seat at its upper end, and has a vertical width of the threaded portion of the intermediate cylindrical body on the outer surface of its lower end. The cylindrical body located at the lowest end of the support column forms a mechanism chamber on the lower surface of its bottom, and has a female threaded part similar to the intermediate cylindrical body on the inner surface of the upper end of the cylindrical body. ,
In addition, a protruding strip is formed on the inner surface in the height direction. forming a hole in the center that passes through each bottom and has a female or male spiral and a retractable key member on the inner surface; A portion of the cylindrical body located next to the cylindrical body serving as the upper end, located below the bottom hole, has a circular cross-section with an outer diameter inscribed in each of the bottom holes, and is located above this circular cross-sectional portion. The part excluding the upper end has a male or female spiral that is screwed into the spiral of the bottom, and the upper end is a rod having a recess into which the key member of the bottom is fitted. A core rod formed to a height approximately directly below the upper end of the cylindrical body that will become the top end of the support is inserted into the hole at the bottom of each cylinder, and this core rod is inserted into the bottom of the support. It should be rotatably installed in the mechanism chamber of the cylindrical body at the lowest end. (g) When a rotational force is applied to the core rod and the core rod is rotated in the forward direction, the cylindrical body that becomes the uppermost end of the column is supported by the convex strip on the inner surface of the cylindrical body, into which the key groove on the outer periphery of the bottom is inserted. As a result, the cylindrical body is sent into the spiral of the rotating core rod in a non-rotatable state and rises, and at the point where the ridge disappears, the key member provided in the hole at the bottom enters the concave part of the core rod. When the cylindrical body is fitted and rotates together with the core rod, the male thread formed on the outer surface of the lower end of the cylindrical body is screwed into the female thread on the inner surface of the upper end of the cylindrical body into which the cylindrical body is inserted. As these two screws are screwed together, they further rise, and the flange-shaped part on the outer periphery of the bottom abuts the female screw, stopping the integral rotation with the core rod body, completing the screw connection of both cylindrical bodies, As the above two screws are screwed together, the next cylindrical body rises, and the hole at its bottom is guided by the spiral of the core rod, and begins to rise without rotating, and at the top of the core rod, the inner surface of the upper end of the next cylinder The male thread on the outer surface of the lower end of the cylindrical body that has ascended is screwed into the female thread of (h) When the core rod in the extended and assembled state is reversely rotated, the core rods are assembled in order from the cylindrical body screwed to the cylindrical body located at the lowest end of the support column. A telescopic device characterized in that the threaded connection between each cylinder is released by reverse rotation of the rod, and the cylinder is shortened and folded by being guided by the core rod and descending on the inner surface of the large diameter cylinder. Flexible prop device.