JPH0814211B2 - Stretchable support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a pillar-supporting jig or a wood cutting tool, which is used particularly for supporting an overhead of a heavy object, for example, erecting a high pillar such as a tent or an antenna. Cableway columns for unloading, tent columns,
Alternatively, various concrete or steel structures such as bridges, buildings, elevated roads, elevated power lines and power generation equipment, inspection, inspection, repair for high places of chemical plants, or mobile antenna for relay, Other sports and various events,
The present invention relates to a retractable strut device which is useful for shooting from a high place such as a disaster site and for lighting.

[Conventional technology]

Conventionally, support for heavy objects at high points, for example, masts for weather observation, antennas, erection works for props for overhead cableways, concrete structures such as bridges, buildings, elevated roads, steel structures, In order to perform inspections, inspections, and other work for elevated places such as overhead power lines and various plants, or to take pictures from elevated places, temporary scaffolding is installed and special crane trucks are used.

[Problems to be Solved by the Invention]

However, assembling a temporary scaffold not only requires a site for that purpose, but also requires a great deal of time and labor for assembling and removing the scaffold, and thus lacks economic efficiency and responsiveness.

On the other hand, when using a dedicated device such as a crane truck for work at high places, the equipment cost is extremely huge because of the dedicated device, and a vehicle for such a dedicated device is
Since it becomes large as a whole, there is a problem that it is heavy and lacks in agility and mobility.

The present invention is to support a relatively large heavy object in the above-mentioned high places, or to perform work such as inspection and inspection of high places which needs to be performed by frequently changing the height and the place, or the high places. To provide a retractable strut device that has sufficient stability in strength when used for measurement from a place, shooting, lighting, etc., and that can exhibit light mobility and operability. That is the subject.

[Means for solving the problem]

The configuration of the present invention for solving the above-mentioned problems is such that the outer diameter of the lower end of the small-diameter cylindrical body is larger than the inner diameter of the upper end of the large-diameter cylindrical body, and the bottomed cylindrical body of different diameters is slidable in the axial direction. It is loosely inserted loosely to form a telescopic support, and a cylindrical body with the maximum diameter located at the lowermost end of the support is wound with a steel strip having one or more cross sections for expanding and contracting the support. One or a plurality of winding rolls and one or a plurality of steel strip drive rolls for sandwiching the steel strips and feeding and pulling back the steel strips, and standing up in a mechanism room equipped with these drive devices, and the winding The upper end of the steel strip fed from the roll, through the guide hole having an arc-shaped guide slit or arc-shaped peripheral edge provided at the bottom of each cylindrical body, the smallest diameter cylinder located at the uppermost end of the column Canopy or bottom at the top of the body In a retractable strut device that is fixed, a key structure is provided at the bottom of each of the cylindrical bodies by pressing a key at a right angle to the cylinder wall by a spring, and a key structure that penetrates a key hole provided in the cylinder wall is provided. The inner wall of the upper end of each large-diameter cylindrical body circumscribing the cylindrical body is provided with a key groove into which the key of the key structure fits, and the tip is a rod having a height corresponding to the key structure. A rod whose side is tapered and whose key is guided by the face is retracted from the key groove against the spring is moved vertically to the bottom of the cylindrical body with the maximum diameter located at the lowermost end of the column. Erected as much as possible, and providing a vertical drive source for the rod in the mechanism chamber,
The guide through hole of the rod is provided at the bottom of each of the cylinders,
Due to the cam structure of the key structure and the cam action of the rod, the key and the key groove are fitted together when the strut is extended, and the key and the key groove are separated when the strut is shortened.

[Work]

The effect of the present invention is that the structure is simple, the expansion / contraction ratio is large, the expansion / contraction is flexible, and the rationality is strong against both vertical and lateral loads.

That is, the device of the present invention is composed of a plurality of cylindrical bodies having different diameters, a steel strip having an arc-shaped cross section, a steel strip drive roll, and a drive device, and has a simple structure.

In addition, since the extension of the support column and the shortened storage are performed only by unwinding and winding the steel strip, it can be expanded and contracted to any length, and a large expansion / contraction ratio can be obtained freely by selecting the length and number of cylinders. To be

Furthermore, a steel strip having an arc-shaped cross section, which is more resistant to longitudinal load than a flat plate, is used, and the steel strip is restrained and held by the guide slits at the bottom of each cylinder, whereby It will be further strengthened.

With respect to lateral load, by adequately selecting the material, diameter, wall thickness of the cylindrical body and the area of each cylindrical joint part, sufficient strength is exhibited, and the influence on the steel strip vulnerable to lateral load is minimized. be able to.

〔Example〕

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

FIG. 1 is a front sectional view in which an intermediate part in the height direction is partially omitted to show one aspect of an assembled state in an example of the device of the present invention, and FIG. 2 is a view of cylindrical bodies during extension and assembly. Fig. 3 is a front sectional view showing an example of the joining structure, Fig. 3 is an end view taken along the line AA of Fig. 2, and Figs. 4 (a) to 4 (f) are arcuate shapes formed on the bottom plate of each cylindrical body. Plan view showing an example of the shape of the guide slit or the guide hole having an arcuate peripheral edge, FIG. 5 is a front view showing another example of the relationship between the arrangement of the steel strips and the drive roller, and FIG. FIG. 5 is a plan sectional view of FIG. 5.

In FIG. 1, 1,2,3,4 are cylindrical bodies having different diameters, which are inserted in order from the small diameter cylindrical bodies 1,2,3 to the large diameter cylindrical bodies 2,3,4, respectively. It The small-diameter and the large-diameter cylindrical bodies may be inserted and mounted on their inner and outer surfaces by forming a detent with a key and a key groove parallel to the sliding direction.

Each of the cylinders 1 to 4 has a bottom plate 1a to 4a at the lower end, and the outer peripheral surfaces of the lower ends of the cylinders 1 to 3 and the cylinders 2 to 4a.
The inner peripheral surface of the upper end of 4 is formed as follows.

That is, in this example, lower flange portions 1b to 3b in which the outer circumferences of the bottom plates 1a to 3a are formed in a large diameter by the cylindrical bodies 1 to 3 are formed on the outer peripheral surfaces of the lower ends of the cylindrical bodies 1 to 3. On the other hand, the inner peripheral surfaces of the lower ends of the cylindrical bodies 2 to 4 are respectively formed with thick-walled joints 2d to 4d having stepped portions 2c to 4c at the lower ends for locking the rising of the lower flanges 1b to 3b. Has been done.

That is, taking an example, the ascending cylindrical body 1
The lower flange portion 1a is the step portion 2c of the cylindrical body 2
When it is lifted until it is locked to, the lift goes up along with the cylindrical body 2 having the locked stepped portion 2c. When the lower-diameter side lower flange portion of the cylindrical body is locked to the large-diameter side step portion, both cylindrical bodies act so as to rise together. In the illustrated embodiment, the number of the cylinders performing the ascending operation is three as the cylinders 1 to 3,
In the present invention, how many cylindrical bodies are used is arbitrary.

On the other hand, upper flanges 1e to 4e are formed on the outer circumferences of the upper ends of the cylindrical bodies 1 to 4, respectively. This flange 1e-4e
When the small-diameter cylinders are accommodated inside the large-diameter cylinder when the cylinders 1 to 3 that have been raised and extended are accommodated in a shortened manner, the lower surface of the upper flange of the small-diameter cylinder is large. This is for abutting the upper surface of the upper flange of the cylindrical body having a diameter so that both the cylindrical bodies descend integrally. In the illustrated embodiment, the cylindrical body 4 having the maximum diameter does not move up and down, so
4e is the flange 4e of the cylindrical bodies 1 to 3 that have been stored and shortened.
Will be supported in.

In some cases, the upper flange may be omitted. In this case, the bottom plate of the small-diameter cylindrical body is sequentially brought into contact with the bottom plate of the large-diameter cylindrical body when the support is shortened and stored, and the cylindrical body is integrally lowered. .

In addition, in the illustrated embodiment, a pair of arc-shaped guide slits 1f to 4f are provided on the bottom plates 1a to 4a of the cylindrical bodies 1 to 4 described above.
However, they are formed in symmetrical positions and shapes with the centers of the bottom plates 1a to 4a interposed therebetween. In addition, a guide member 5 that guides a retracting operation of a locking pin 6 to be described later is provided at a central portion of each of the bottom plates 1a to 4a.
Through holes 1g to 3g are formed for inserting the.

In this embodiment, the guide member 5 includes four columnar rods 5a.
˜5d are formed on the tapered surfaces 5a ′ to 5d ′ at their upper ends, and the bottom plate 4a of the cylindrical body 4 having the maximum diameter is appropriately stroked.
It is formed by standing upright so that it can move downward, and when each of the cylindrical bodies 1 to 3 is stored and shortened,
It is inserted into the guide through holes 1g to 3g provided in the bottom plates 1a to 3a.

In the embodiment, the locking pin 6 is provided within the thickness of the bottom plates 1a to 3a of the rising and falling cylinders 1 to 3, and the spring 6a and this spring are provided on the diameter of each bottom plate 1a to 3a. Two tongue-shaped pin bodies 6 attached to both ends of 6a and constantly urged outward by the springs 6a.
b, 6c, and the tips 61b, 61c of the pin bodies 6b, 6c can be projected from the outer periphery of the bottom plate by the action of the spring 6a.

On the other hand, in the guide member 5, the tips 61b and 61c of the two pin bodies 6b and 6c of the locking pin 6 are attached to the cylindrical body 3 having a small diameter.
Is raised inside the large-diameter inner cylinder 4 and is kept within the outer diameter of the bottom plate against the repelling force of the spring 6a until the flange 3b abuts the locking step 4c. In the embodiment, a pair of left and right rods 5a, 5b and 5c, 5d having a guide surface for holding and guiding the pin bodies 6b, 6c from the left and right outer sides, and these four rods 5a to 5d. It is formed by a cylinder 5e that moves up and down together on the bottom plate 4a. Here, the guide surfaces are formed on the tapered surfaces 5a 'to 5d' that extend outwardly toward each other near the upper ends of the rods 5a to 5d, so that the pin bodies 6b and 6c are formed by the action of the spring 6a. Tip 61b, 61c
Is projected to the cylinder wall side. Therefore, the inner surface of the thick joints 2d to 4d of the large-diameter cylindrical bodies 2 to 4 is
Fitting recesses 2h, 3h, 4h are formed on the inner surface of the cylindrical body corresponding to the positions where the tips 61b, 61c of the 6b, 6c project. Note that 2h and 3h are not shown.

In the device of the present invention, the guide member 5 and the locking pin 6 of the above embodiment may be provided if necessary, and are not essential.

The four cylindrical bodies 1 to 4 having the above-mentioned configuration are
In this embodiment, two strips of steel strip 8 and 9 having a gentle arcuate cross section are provided in a mechanism chamber 7 formed in the lower part of the cylindrical body 4 located at the bottom of the maximum diameter. Since the cylinders 1 to 4 are extended or shortened by winding, an example of the structure for feeding and winding the mechanism chamber 7 and the steel strips 8 and 9 will be described below.

In the mechanism room 10, 10 and 11 are winding rolls 12a and 12b, which are winding rolls of steel strips 8 and 9 each having a flat arc-shaped cross section.
13a, 13b are fed from the winding rolls 10, 11, or a pair of pinch rolls 14a, 14b, 15a, which sandwich the steel strips 10, 11 wound on the rolls 10, 11 and guide the traveling thereof, respectively. 15b is a pair of drive rolls provided for winding and feeding the steel strips 10 and 11, respectively, and the rolls 12a to 15b are
The rolls 12a, 13a, 14a, 15a have an hourglass-shaped cross section and the rolls 12b, 13b, 14b, 15b have a spindle-shaped cross section so that the steel strips 8 and 9 can be sandwiched according to the cross-sectional shapes of the steel strips 8 and 9. is there.

Here, the width of the steel strips 8 and 9 may be uniform over the entire length,
There is also a shallow taper shape in which the tip side is narrowed according to the inner diameter of each cylinder.

In addition, arc-shaped guide slits or guide holes provided on the bottom plates 1a to 4a of the respective cylinders 1 to 4 are shown in FIG.
When formed as shown in (b), the steel strips 8 and 9 have their bulging sides abutted against each other, as shown in FIG. 5, so that the guide slits 1f to 4f of the bottom plates 1a to 4a or the guide slits 1f to 4f. While the hole GF ₁ is inserted, the two strips of steel strip 8 and 9 may be fed out by a pair of spindle-shaped drive rolls 14b ′ and 15b ′ to perform an operation for winding. FIG. 6 is a plan sectional view showing the relationship between the drive rolls 14b ′, 15b ′ and the two steel strips 8 and 9 shown in FIG. 5, and the gaps of the drive rolls 14b ′, 15b ′ are
Guide spacers 16 and 17 are provided.

The drive rolls 14a, 14b, 14b ', 15a, 15b, 15b', and the pinch rolls 12a, 12b, 13a, 1 when the design requires
The 3b and the take-up rolls 10 and 11 are provided with drive motors (not shown) that rotate forward and backward in synchronization. Also, drive roll 14
As an example, it is preferable that the a, 14b, 15a, 15b and the steel strips 8, 9 have no drive slip due to the engagement relationship between the male and female relationship portions formed on both and the friction between the two. Further, a plurality of pairs of driving rolls 14 and 15 are provided almost vertically, or, in contrast to the driving rolls having a plurality of pairs, for example, as shown in FIG. 7, the driving rolls 14a, 14b and 15a, 15b are made of steel. Obi 8,9
And the crawler track 14
It is also possible to hang c and 15c as drive belts and move the steel strips 8 and 9 forward and backward by this belt.

In addition, in addition to the above example, for clamping drive of steel strips 8 and 9,
There is also a method of using a drive roll and a slip member in pairs, and a method shown in FIGS. 5 and 6 described above, and which method is adopted is arbitrary.

Each of the members 10 to 15 having the above-described configuration constitutes an example of the guide roll pair and its driving device in the present invention, which serves as a mechanism for winding and feeding the steel strips 8 and 9.

Thus, the front ends 8a and 9a of the two steel strips 8 and 9 having the arcuate cross section on the payout side are the bottom plates 4a to 1a of the cylindrical bodies 4-1 in sequence.
A pair of guide slits 4f to 1f in the shape of a circular arc
Cap body 1i at the upper end of the smallest-diameter cylindrical body 1 inserted through
Is fixed to the bottom surface of.

The upper surface of the cap body 1i is used as a mounting portion for various working machines. Further, the tips 8a and 9a of the steel strips 8 and 9 may be fixed to the lower surface of the bottom plate 1a of the cylindrical body 1.

An example of the device of the present invention is, as described above, a small-diameter cylindrical body and large-diameter cylindrical bodies 1 to 4 in which the small-diameter cylindrical bodies are densely inserted.
And the guide slits 1f to 4f of the steel strips 8 and 9 formed on the bottom plates 1a to 4a of the respective cylinders 1 to 4 and the tips thereof are fixed to the smallest diameter cylinder 1 through the respective slits 1f to 4f. It is composed of two strips of steel strips 8 and 9 having an arcuate cross section, and a winding / unwinding mechanism of a mechanism chamber 7 in which the steel strips 8 and 9 are freely wound and unwound. Next, the mode of operation of the device of the present invention will be described.

When the cylinders 1 to 4 are stored and the device is in the shortened state, the cylinders 1 to 4 are shortened to a state in which their upper flanges 1e to 4e are sequentially abutted and stacked, and thus the steel strip 8 , 9 are also wound on the winding rolls 10 and 11.

Here, the locking pin 6 provided on each of the bottom plates 1 to 3
Under the action of the guide member 5, the tips 6 of the pin bodies 6b and 6c are
1b and 61c are held in the immersed position.

In order to extend and assemble the device of the present invention from the shortened storage state, the winding and feeding mechanism is driven to feed the steel strips 8 and 9 wound on the rolls 10 and 11 from the rolls 10 and 11.

When the steel strips 8 and 9 start to be drawn out, the steel strips held as if sandwiched by the guide slits 4f to 1f of the bottom plates 4a to 1a.
The tips 8a and 9a of 8, 9 start to rise, and the cylindrical body 1 having the smallest diameter to which the tips are fixed starts to rise.

When this cylindrical body 1 reaches the thick joint 2d at the upper part of the cylindrical body 2 as the steel strips 8 and 9 are fed out, the lower flange portion 1b of the cylindrical body 1 is formed at the lower end of the joint portion 2d of the cylindrical body 2. It abuts on the locking step portion 2c and continues to rise along with the cylindrical body 2.

In the above, when the flange portion 1b of the bottom portion 1a of the cylinder body 1 reaches the step portion 2d of the cylinder body 2, the pin bodies 6b and 6c of the locking pin 6 incorporated in the bottom portion 1a are acted upon by the guide member 5. It is fitted into the fitting recess 2h (not shown in the figure) to fix the coupling between the cylindrical bodies 1 and 2.

Hereinafter, similarly, the flange portion of the bottom portion 2a of the cylindrical body 2
2b abuts on the stepped portion 3d of the cylindrical body 3, and the locking pin 6 provided inside the bottom portion 2a operates to couple the two cylindrical bodies 2 and 3 together. Continues to rise with
The flange portion 3b of the bottom portion 3a of the cylindrical body 3 comes into contact with the step portion 4d of the cylindrical body 4 having the maximum diameter, and the locking pin 6 provided in the bottom portion 3a is actuated, so that the lower side of the cylindrical body 3 and the cylindrical body 3 The extension and assembly of the illustrated apparatus of the present invention is completed by the connection with the upper side of 4.

In the extension assembly of the device of the present invention described above, the steel strips 8 and 9 having an arcuate cross-section are self-supporting by themselves when they are drawn out because of their cross-sectional shapes, but here, the respective cylindrical bodies 4-1 are used.
Since it stands up in an extended state while being held by the arc-shaped guide slits 4f to 1f provided on the bottom plates 4a to 1a, it is possible to exert sufficient buckling strength against a vertical load. Moreover, since the lower portions of the respective cylinders 1 to 3 overlap the thick-walled joints 2d to 4d of the large-diameter cylinders 2 to 4 with relatively large vertical width portions to be in the joined state, Sufficient strength can be exhibited even for lateral loads.

In the above embodiment, the bottom plates 1a to 4a of the cylinders 1 to 4 are used.
In addition, the steel strips 8 and 9 formed two guide slits 1f to 4f, but in the present invention, instead of these slits 1f to 4f, an arc-shaped outer peripheral edge f as shown in FIG. 4B is used. _The guide hole GF ₁ having ₁ and f ₂ may be formed.

The shape of the guide slit or hole is shown in Fig. 4 (c).
As shown in (f) to (f), it may be formed in a guide hole surrounded by three to four arc-shaped slits or an arc-shaped outer peripheral edge of three to four sides. This point will be described later.

On the other hand, in each of the above-described embodiments, the arc-shaped guide slits or guide holes are formed so that the convex portions of the arc-shaped portions face each other, but the concave portions may also face each other.

Here, in each of the above-mentioned embodiments, the apparatus in which the two steel strips 8 and 9 are incorporated has been described, but in the device of the present invention, the three or four steel strips 8 and 9 are arranged in the mechanism chamber. It may be incorporated in the winding and feeding mechanism of No. 7.

When three or four steel strips 8 and 9 are incorporated, depending on the number of steel strips to be incorporated, the winding rolls 10 and 11, the pinch rolls 12 and 13 and the drive rolls 14 and 15 in the previous embodiment As for each set of rolls, a number of sets corresponding to the number of steel strips to be incorporated are arranged in the mechanism chamber 7. In addition, each cylindrical body 1 to 4 bottom plate 1a to 4a
The number of guide slits 1f to 4f formed in, or the number corresponding to the number of steel strips in which guide holes are also incorporated is provided. Such a guide slit or guide hole is, for example, the fourth
The plane form is as shown in FIGS.

Here, FIG. 4 (c) shows each bottom plate 1a in the case where three strips of steel strip having an arc-shaped cross section are arranged in a substantially triangular shape.
Plan view of a guide slit lf ₁ ~lf ₄ formed to 4A, the Fig. 4 (d) are the outer peripheral edge f ₁ ~f ₄ to each bottom plate 1a~4a in place of the guide slit lf ₁ ~lf ₄ FIG. 9 is a plan view of an example in which a guide hole GF ₂ having the same is formed.

On the other hand, FIG. 4 (e) shows each bottom plate 1a when four steel strips having an arc-shaped cross section are arranged in a substantially rectangular shape.
Plan view of a guide slit lf ₁ ~lf ₄ formed to 4A, the Fig. 4 (f) the outer peripheral edge f ₁ ~f ₄ to each bottom plate 1a~4a in place of the guide slit lf ₁ ~lf ₄ FIG. 9 is a plan view of an example in which a guide hole GF ₃ having the same is formed.

Next, the operation of the apparatus of the present invention, which is extended and assembled with the above-mentioned structure, at the time of shortening the storage will be described with reference to FIGS.

The driving rolls 14 and 15 and the winding rolls 10 and 11 are driven to the winding side to wind up the two stretched steel strips 8 and 9.

When the steel strips 8 and 9 start to be wound, the tips 8a and 9a thereof are fixed to the uppermost cylindrical body 1, and the respective cylindrical bodies 1 to 3 are the large diameter cylindrical bodies 2 to 4 and the locking pin. Since they are connected by 6, each of the cylindrical bodies 1 to 3 is subjected to the action of descending in the extended state.

At this time, the pin bodies 6b and 6c of the locking pin 6 of the cylindrical body 3 are
At the time of this descent, the guide member 5 is slightly raised by the action of the raising mechanism 5e, so that the guide member 5 immediately receives the action of the guide surfaces 5a 'and 5d' of the guide member 5 and is inserted into the inner diameter of the bottom plate 3a. Eventually, the cylindrical bodies 1 to 3 descend in such a state that the cylindrical body 3 among them is housed inside the cylindrical body 4.

The cylinder 3 is lowered until the upper flange 3e provided on the outer periphery of the upper end thereof abuts the upper flange 4e of the cylinder 4 (or the bottom plate 3a of the cylinder 3 abuts the bottom plate 4a of the cylinder 4). Then, at the same time as this contact is prevented, the bottom plate 2a of the cylindrical body 2 reaches the position of the guide member 5, and the action of the locking pin 6 is released by the rise of this guide member 5 to cause the cylindrical body 2 to move. It is housed inside the cylindrical body 3 and the device is shortened. Similar to the cylinder 2, the connection of the cylinder 1 to the cylinder 2 is released, and the cylinder 1 is housed inside the lowered cylinder 2 to complete the shortening operation of the entire apparatus.

Although the present embodiment has been described with reference to the case where a lock pin driven by a spring is built into the bottom of each cylindrical body and a guide member that cams on the lock pin is provided, the present invention provides a lock pin and a guide member. Of course, if there is no such thing, it will be established, and that is the basic form.

In this case, the shortened storage of the stanchion is started from the small diameter cylinder by pulling down the smallest diameter cylinder at the upper end by winding up the steel strip, and each cylinder is at the same time inside the largest diameter cylinder. Is stored in.

〔The invention's effect〕

The present invention is as described above, and since the strut device can be freely expanded and contracted, and the expansion and contraction is performed by feeding and winding a steel strip having an arc-shaped cross section, the expansion and contraction operation is, of course, smooth. Since the device can be formed into a device having sufficient strength to support a large weight and the cylindrical body is designed to withstand lateral load, it is possible to maintain stability against strong wind. Therefore, inspections and inspections performed by supporting heavy objects at a high place such as in a narrow place where a temporary scaffolding is not built, or columns for erection cannot be erected, or a place where a dedicated vehicle for working at high places cannot enter It is extremely useful as a support device for various operations such as repairs, or relaying of radio waves performed in high places outdoors, lighting, and shooting.

Further, when not in use, the constituent members are housed in the mechanism chamber and the lowermost cylindrical body, so that the entire apparatus can be compactly assembled, and therefore, the apparatus is very convenient for transportation and storage.

[Brief description of drawings]

FIG. 1 is a front sectional view in which an intermediate part in the height direction is partially omitted to show one aspect of an assembled state in an example of the device of the present invention, and FIG. 2 is a view of cylindrical bodies during extension and assembly. Fig. 3 is a front sectional view showing an example of the joining structure, Fig. 3 is an end view taken along the line AA of Fig. 2, and Figs. 4 (a) to 4 (f) are arcuate shapes formed on the bottom plate of each cylindrical body. Plan view showing an example of the shape of the guide slit or the guide hole having an arcuate peripheral edge, FIG. 5 is a front view showing another example of the relationship between the arrangement of the steel strips and the drive roller, and FIG. FIG. 5 is a plan sectional view of FIG. 5. 1,2,3,4 …… Cylinders with different diameters, 1a to 4a …… Bottom plate, 1b to 3
b …… Lower flange, 2c to 4c …… Locking step, 2d to 4d ……
Thick joints, 1e to 4e ... upper flange, 1f to 4f ... guide slits, 1g to 3g ... guide through hole of guide member 5, 2h to
4h ... Fitting recess, 5 ... Guide member, 5a-5d ... Columnar rod in guide member 5, 5a'-5d '... Columnar rod 5a-
5d upper tapered surface, 6 ... Locking pin, 6a ... Spring, 6b, 6c ... Pin body, 7 ... Mechanism chamber, 8, 9 ... Steel strip, 1
0,11 …… Winding roll, 12a, 12b, 13a, 13b …… Pinch roll, 14a, 15a …… Hourglass drive roll, 14b, 15b …… Spindle drive roll, GF ₁ , GF ₂ , GF ₃ …… Guide hole, f _{1 to} f ₄ …… Guide hole GF _{1 to} GF ₃ arcuate outer peripheral edge, lf _{1 to} lf ₄ …… Guide slit

Claims (6)

[Claims] 1. A plurality of bottomed cylindrical bodies having different diameters, the outer diameter of the lower end of the cylindrical body having a smaller diameter being larger than the inner diameter of the upper end of the cylindrical body having a large diameter, is freely slidably inserted in the axial direction so as to extend and contract. A single or a plurality of take-up rolls for forming a pillar, and a cylindrical body having a maximum diameter located at the lowermost end of the pillar, for winding the steel strip having a single or a plurality of cross sections having an arc shape for expanding and contracting the pillar; One or a plurality of steel strip drive rolls for sandwiching and stripping the steel strips, and standing upright in a mechanism room equipped with these drive devices, and the steel strips delivered from the winding rolls. The upper end of the cylindrical body of the smallest diameter located at the uppermost end of the column by penetrating an arc-shaped guide slit or a guide hole having an arc-shaped peripheral edge provided at the bottom of each cylindrical body. Stretchable columns fixed to the canopy or bottom In addition, a key structure is formed at the bottom of each of the cylinders by pressing a key at a right angle to the cylinder wall with a spring, and a key structure penetrating a key hole formed in the cylinder wall is provided. The inner wall of the upper end of each cylindrical body is provided with a key groove into which the key of the key structure is fitted, while the tip is a rod having a height corresponding to the key structure and the tip side is formed into a tapered surface. A rod body, in which the key guided to the surface is retracted from the key groove against a spring, is erected vertically on the bottom of a cylindrical body of the maximum diameter located at the lowermost end of the column, and A vertical drive source for the rod is provided in the mechanism chamber, and a guide through hole for the rod is provided at the bottom of each of the cylinders. The key structure and the cam action of the rod allow the key to be extended when the column is extended. The key groove fits with the key groove. It was so disengaged telescoping column apparatus according to claim. 2. A telescopic strut device according to claim 1, wherein the steel strip drive rolls formed in the spindle shape and the hourglass shape are used alone or as a pair. 3. An extendable strut device according to claim 1 or 2, wherein the steel strip having an arcuate cross section has a shape in which the width gradually decreases toward the tip along the longitudinal direction. . 4. A steel strip drive roll having notches or holes for assisting the feeding of the steel strip and a steel strip drive roll having a concavo-convex engagement with the roll surface. An extendable strut device according to any one of items 1 to 3. 5. The steel strip is sandwiched between belts driven by a plurality of rolls to feed and pull back the steel strip, according to any one of claims 1 to 4. Stretchable strut device. 6. A column and a key groove that fit in parallel to each other are provided on the inner and outer surfaces of each cylindrical body to be loosely inserted to prevent rotation of the column. An extendable strut device according to any one of item 5.