JP2019015073A - Tubular sliding structure and expandable ladder to which the same is applied partially - Google Patents

Abstract

To provide a tubular sliding structure, which is expandable/contractable by a relative sliding movement between tubular sliding bodies, and is configured to restrict the siding movements of the tubular sliding bodies at a specific position and to secure structural strength that allows the tubular sliding bodies not to disengage from one another.SOLUTION: A tubular sliding structure includes: a first tubular body 110-1; a second tubular body 110-2 having an outer diameter that is slightly smaller than an inner diameter of the first tubular body and capable of being inserted into the first tubular body; an inner side expansion portion 111 provided as a partially recessed portion of the first tubular body 110-1 so as to expand toward inside an inner wall surface; an outer side expansion portion 112 provided as a partially expanded portion of the second tubular body 110-2 so as to expand toward outside an outer wall surface; and an outer clamp 190 attached to the inner side expansion portion 111 of the partially recessed portion of the first tubular body and having an inner shape fitted into the shape of the inner side expansion portion 111, for tightening from the outside to improve the structural strength of the inner side expansion portion 111.SELECTED DRAWING: Figure 1

Description

  The present invention is a sliding structure between cylindrical bodies that can slide until a predetermined state is achieved, and the sliding structure between the cylindrical bodies can be partially expanded and contracted in the length direction. Concerning the ladder.

Generally, a structure in which cylindrical bodies are slidable is known as a structure that expands and contracts the length of the cylindrical body.
FIG. 13 and FIG. 14 are diagrams showing examples of structures in which cylindrical bodies can be slid and their lengths can be expanded and contracted (Japanese Patent Laid-Open No. 2012-072638). Both of the structural examples of FIGS. 13 and 14 are examples incorporated as a cylindrical columnar body of an extendable ladder in the prior art.
13 and 14 show a first cylindrical body 10 having a large diameter and a second cylindrical body 20 having a small diameter.
FIG. 13 is a diagram for explaining an example in which the first cylindrical body 10 having a large diameter is fixed and the second cylindrical body 20 having a small diameter slides downward.

The first cylindrical body 10 has a larger diameter than the second cylindrical body 20.
The second cylindrical body 20 has an outer diameter that is slightly smaller than the inner diameter of the first cylindrical body 10 and is inserted into the first cylindrical body 10.
A throttle portion is provided in a part of the first cylindrical body 10, and an inner bulging portion 11 is provided so as to bulge inside the inner wall surface.
A part of the second tubular body 20 is provided with a bulging portion, and an outer bulging portion 21 is provided so as to bulge outside the outer wall surface.
As shown in FIG. 13, when the second cylindrical body 20 is inserted and slid into the first cylindrical body 10 so as to be inserted from above, as shown on the right side of FIG. In addition, the inner bulging portion 11 and the outer bulging portion 21 can be moved downward until they come into contact with each other and become locked, but when both are locked, the second tubular body with respect to the first tubular body 10 is obtained. Twenty relative sliding stops. The second cylindrical body 20 cannot move any further downward and does not slip out to the lower side of the first cylindrical body 10.

Next, FIG. 14 is a diagram illustrating an example in which the first cylindrical body 10 having a large diameter slides downward with respect to the second cylindrical body 20 having a small diameter.
FIG. 14 is a diagram for explaining an example in which the second cylindrical body 20 having a small diameter is fixed and the first cylindrical body 10 having a large diameter slides downward.
The first cylindrical body 10 has an inner diameter that is slightly smaller than the outer diameter of the second cylindrical body 20, and is configured to be extrapolated with respect to the first cylindrical body 10.
Also in the configuration example of FIG. 14, as in the case of FIG. 13, a throttle portion is provided in a part of the first cylindrical body 10, and the inner bulging portion 11 is bulged inside the inner wall surface. The bulging part is provided in a part of 2nd cylindrical body 20, and the outer bulging part 21 is provided so that it may bulge outside the outer wall surface.
As shown in FIG. 14, when the first cylindrical body 10 is inserted and slid in the form of being extrapolated from above with respect to the second cylindrical body 20, as shown on the right side of FIG. In addition, the inner bulging portion 11 and the outer bulging portion 21 can be moved downward until they come into contact with each other and become locked, but when both are locked, the second tubular body with respect to the first tubular body 10 is obtained. Twenty relative sliding stops. The first tubular body 10 cannot move any further downward and does not slip out to the lower side of the second tubular body 20.

As shown in FIG. 14, the first cylindrical body 10 having a large diameter is fixed and the second cylindrical body 20 having a small diameter slides downward as shown in FIG. Even in the structural example in which the second cylindrical body 20 having a small diameter is fixed and the first cylindrical body 10 having a large diameter slides downward, the inner bulging portion 11 and the outer bulging portion 21 are Although it can slide until it contacts and latches, if it both latches, it has a mechanism in which slide movement stops.
A structure in which a cylindrical body slides and expands and contracts is applied as various members. As a very example, it is used as a structure of a cylindrical column of a telescopic ladder. The telescopic ladder is a ladder that is in a shortened stowed state in a normal state, but is dynamically extended during use to be in a used state, and returned to the shortened stowed state when the use of the ladder is finished. For example, work suspension ladders that are suspended at suspension points during work as a means of moving down from high places to work sites below work, or emergency situations where customers need to evacuate outside, such as buildings and trains As an evacuation means for evacuating downward at times, there is an evacuation suspension ladder suspended from a suspended portion. There can be various other variations depending on the application.

JP 2012-072638 A

As described above, a structure example in which the cylindrical bodies are slidable is known, but when the applied force is increased, the locking structure of the both may collapse and the cylindrical body may come out. .
FIG. 15 is a diagram for explaining a problem that may occur in the structure shown in FIG. FIG. 15 is an example in which the first cylindrical body 10 having a large diameter is fixed and the second cylindrical body 20 having a small diameter slides downward.
When the second cylindrical body 20 having a small inner diameter is long and heavy, a large gravity may be applied. When a large weight is applied by the pressure from the outer bulging portion 21, the bulging of the inner bulging portion 11 of the first cylindrical body may be crushed and the diameter may be increased. When the inner bulging portion 11 of the first cylindrical body is crushed and the diameter is expanded to some extent, the locking between the first cylindrical body 10 and the second cylindrical body 20 does not work, and the second cylinder There is a possibility that the outer bulging portion 21 of the shaped body 20 passes and falls out downward.
When the second cylindrical body 20 comes out downward without being locked with respect to the fixed first cylindrical body 10, there occurs a problem that the entire second cylindrical body 20 falls.

Similar problems can occur in the structure shown in FIG.
FIG. 16 is a diagram for explaining a problem that may occur in the structure shown in FIG. FIG. 16 is an example in which the second cylindrical body 20 having a small inner diameter is fixed and the first cylindrical body 10 having a large outer diameter slides downward.
There may be a case where a large amount of gravity is applied when the first cylindrical body 10 having a large outer diameter that is locked to the inner second cylindrical body 20 is long and heavy. If a large weight is applied to the inner bulging portion 11 due to the pressure received from the outer bulging portion 11, the bulging of the inner bulging portion 11 of the first cylindrical body 10 may be crushed and the diameter may be increased. When the inner bulging portion 11 of the first cylindrical body is crushed and the diameter increases to some extent, the locking with the second cylindrical body 10 does not work, and the inner bulging portion 11 of the first cylindrical body does not work. May pass through and fall out downward.
When the first tubular body 10 is pulled out downward without being locked with respect to the fixed second tubular body 20, there is a problem that the entire first tubular body 10 falls.

  If this sliding structure is incorporated in the ladder, there is a risk that the ladder member will be detached and a part of it will fall if the locking of the cylindrical bodies does not work. However, in the case of a telescopic ladder, double and triple safety measures are taken to prevent the accident that the ladder member is detached and falls, so that the accident of falling cannot occur. Needless to say, it is preferable that the sliding structure between the members functions normally.

  The present invention has been made in view of the above circumstances, and in a cylindrical body sliding structure in which cylindrical bodies can slide and expand and contract, sliding between cylindrical bodies extended to a predetermined position. The structure which restricts has a large structural strength, and it aims at ensuring structural strength so that the malfunction which pulls out may not occur. A telescopic ladder that incorporates a sliding structure between cylindrical bodies that ensures its structural strength, ensures structural strength in an extended use state, and ensures structural strength so that it does not break out. The purpose is to provide.

In order to achieve the above object, the cylindrical body sliding structure of the present invention has a first cylindrical body and an outer diameter slightly smaller than the inner diameter of the first cylindrical body, and the first cylinder A second cylindrical body that can be inserted into the cylindrical body, and a throttle portion provided in a part of the first cylindrical body, and an inner bulge provided to bulge inside the inner wall surface A bulging portion provided in a part of the second cylindrical body, an outer bulging portion provided so as to bulge outside the outer wall surface, and the first cylindrical body. Attached from the outer periphery to the inner bulged portion of the throttle portion, supports a throttle portion filling portion that fits into the throttle shape on the outer wall surface side of the inner bulged portion, and externally while fitting into the throttle shape A cylindrical body sliding structure comprising an outer tightening body that is tightened to improve the structural strength of the inner bulging portion.
In the above configuration, the outer bulge of the outer bulge is larger than the inner bulge of the inner bulge, and the location where the inner bulge of the first tubular body is provided is the second It is preferable that both the outer bulging portions of the cylindrical body are locked so as not to pass.

With the above configuration, the outer tightening body is firmly tightened from the outside, the inner surface shape of the outer tightening body matches the shape of the inner bulging portion of the throttle portion, and the inner bulging portion cannot be crushed outward. Thus, the locking structure that restricts sliding between the cylindrical bodies has a large structural strength, and a structural strength that does not cause a problem of falling out can be ensured.
In addition, as a throttle part filling part, it can provide as what was integrated as a bulging part of the inner wall face of an outer fastening body. If it is integrated as a bulging part of the inner wall surface of the outer tightening body, the first cylindrical body can be obtained simply by attaching and tightening the outer tightening body to the inner bulging part of the throttle part of the first cylindrical body. The throttle portion filling portion is securely attached to the throttle portion of the squeeze portion, and can be tightened by an external fastening body.
Further, as the throttle portion filling portion, a resin molding formed by curing the adhesive injected between the inner wall surface of the outer tightening body and the inner bulging portion of the throttle portion of the first cylindrical body. It can also be a body. The outer tightening body itself may be a simple tubular body, and after passing through the inner bulging portion of the throttle portion of the first cylindrical body, the outer bulging portion and the outer tightening portion of the first cylindrical body. Since the squeezed portion filling portion is formed simply by injecting an adhesive into the gaps of the body and drying it, labor for assembling the cylindrical body sliding structure of the present invention can be saved.
In addition, it is preferable that the inner wall surface of the outer fastening body provided with the throttle portion filling portion is a rough surface provided with grooves or irregularities. If the inner wall surface of the outer tightening body is a rough surface provided with grooves or irregularities, the holding power of the cured adhesive is improved.

Here, there are two patterns in the relationship between the fixed side of the cylindrical body and the size of the diameter.
The first pattern is in a state where the second cylindrical body is supported, the first cylindrical body is extrapolated from the upper side with respect to the second cylindrical body, and the outer tightening body is The position of the inner bulging portion of the attached first tubular body is higher than the position of the outer bulging portion of the second tubular body, and the positions of the inner bulging portion and the outer bulging portion are higher. This is a pattern in which the first cylindrical body is locked to the second cylindrical body by the locking.

The second pattern is in a state in which the first cylindrical body is supported, the second cylindrical body is inserted from above with respect to the first cylindrical body, and the outer tightening body is The position of the inner bulge portion of the attached first cylindrical body is lower than the position of the outer bulge portion of the second cylindrical body, and the positions of the inner bulge portion and the outer bulge portion are low. This is a pattern in which the second cylindrical body is locked to the first cylindrical body by the locking.
In any pattern, the structural strength of the locking structure is greatly improved by attaching the outer fastening body.

  Next, the extendable ladder according to the present invention is an extendable / detractable ladder in which the above-described cylindrical body sliding structure is partially applied. As for the above-described first pattern cylindrical body sliding structure incorporated, a pair of cylindrical bodies arranged in parallel to each other at a predetermined interval and a horizontal section provided between the cylindrical bodies. A ladder basic member provided with a crosspiece is a basic unit, and the ladder basic members are sequentially connected so as to be slidable in the cylinder axis direction of the cylindrical body, and the ladder basic member is slidably accommodated. The ladder basic member has an extended use state in which the ladder basic member slides and extends, and the ladder basic member in each stage slides and extends downward to enter the extended use state, from the extended use state. In the extendable ladder that can change to the shortened storage state, the throttle portion is provided near the upper part of the cylindrical body of the ladder basic member at the current stage to provide the inner bulging portion and the outer tightening body. Under the cylindrical body of the ladder base member on the side The outer bulging portion is provided in the vicinity, and the relationship between the first cylindrical body and the second cylindrical body is set, and the ladder basic member at the present stage is vertically moved with respect to the ladder basic member on the upper stage side. It is slidable and can be extended until the inner bulging portion and the outer bulging portion are engaged with each other.

  The above-described second-pattern cylindrical body sliding structure is incorporated into a pair of cylindrical bodies arranged in parallel to each other at a predetermined interval and a horizontal section provided between the cylindrical bodies. A ladder basic member provided with a crosspiece is a basic unit, and the ladder basic members are sequentially connected so as to be slidable in the cylinder axis direction of the cylindrical body, and the ladder basic member is slidably accommodated. The ladder basic member has an extended use state in which the ladder basic member slides and extends, and the ladder basic member in each stage slides and extends downward to enter the extended use state, from the extended use state. In the extendable ladder that can be changed to the shortened storage state, the throttle portion is provided near the lower portion of the cylindrical body of the ladder basic member at this stage, the inner bulging portion and the outer clamp are provided, and the upper stage On the cylindrical body of the ladder basic member on the side The outer bulging portion is provided in the vicinity, and the relationship between the first cylindrical body and the second cylindrical body is set, and the ladder basic member at the present stage is vertically moved with respect to the ladder basic member on the upper stage side. It is slidable and can be extended until the inner bulging portion and the outer bulging portion are engaged with each other.

  Further, a lock mechanism can be provided as a measure for preventing the separation of the cylindrical sliding structure. That is, in a state where the inner bulge portion and the outer bulge portion are engaged with each other, the lock basic mechanism temporarily fixes the ladder basic members so as not to be slidable, and triggered by an operation from the outside. The structure is provided with a lock release mechanism that releases the locked state and allows the ladder basic members at the current stage and the lower stage to slide.

According to the cylindrical sliding structure of the present invention, by attaching the outer tightening body, the outer tightening body is firmly tightened from the outside, and the inner surface shape of the outer tightening body matches the shape of the inner bulging portion of the throttle portion. The inner bulging part can be firmly supported so that it cannot be crushed outward, and the locking structure that restricts sliding between the cylindrical bodies has great structural strength, and the cylindrical body comes out It is possible to ensure a structural strength that does not generate any.
Further, according to the telescopic ladder of the present invention, when the ladder main body is expanded, the ladder basic members slide and expand each other, and the structural strength of the sliding structure between the ladder basic members increases. It is possible to secure a structural strength that does not cause a problem that the ladder basic member comes off.

It is a figure which shows typically the example of a fundamental structure of the 1st cylindrical body 110-1 which has a narrowing part among the cylindrical body sliding structures 100 concerning Example 1. FIG. It is a figure which shows the combination pattern which fixes the 2nd cylindrical body 110-2, slides the 1st cylindrical body 110-1 downward from the top, and latches. It is a figure which shows the combination pattern which fixes the 1st cylindrical body 110-1 and slides the 2nd cylindrical body 110-2 from the top to the bottom. It is a figure which shows typically the structural example which forms the aperture | diaphragm | squeeze part filling part of the outer clamp body 190 with an adhesive agent. The rear view (surface which faces the wall surface side of a work location) of the expansion-contraction ladder 100 of the expansion | extension use condition concerning Example 2 is shown. It is a figure explaining the procedure which expand | deploys the expansion-contraction ladder 100 in a shortened storage state from a shortened storage state, and makes it an expansion | extension use state. It is a figure explaining the procedure which collect | recovers the expansion-contraction ladder 100 in an expansion | extension use state, and changes it to a shortened accommodation state. The rear view (surface which faces the wall surface side of a work place) of the expansion-contraction ladder 100 of the expansion | extension use condition concerning Example 3 is shown. It is a figure explaining the procedure which expand | deploys the expansion-contraction ladder 100 in a shortened storage state from a shortened storage state, and makes it an expansion | extension use state. It is a figure explaining the procedure which collect | recovers the expansion-contraction ladder 100 in an expansion | extension use state, and changes it to a shortened accommodation state. It is a figure which shows simply the mechanism by which the lock mechanism 130 of the junction part of the ladder basic member 101 is locked at the time of expansion | deployment of the expansion-contraction ladder 100. FIG. It is a figure which shows simply the mechanism which cancels | releases the lock of the lock mechanism 130 by the lock release mechanism 140 at the time of collection | recovery of the expansion-contraction ladder 100. FIG. In prior art, it is a figure explaining the example to which the 1st cylindrical body 10 with a big diameter is fixed, and the 2nd cylindrical body 20 with a small diameter slides below. In prior art, it is a figure explaining the example which the 1st cylindrical body 10 with a large diameter slides below with respect to the 2nd cylindrical body 20 with a small diameter. It is a figure explaining the problem which may generate | occur | produce in the structure shown in FIG. It is a figure explaining the problem which may generate | occur | produce in the structure shown in FIG.

Hereinafter, embodiments of the telescopic ladder according to the present invention will be described with reference to the drawings.
It goes without saying that the scope of the present invention is not limited to the specific shape, design, number, angle, etc. shown in the following examples.
Hereinafter, each example will be described in the following order.
Example 1 demonstrates the basic structure of a cylindrical body sliding structure.
Example 2 explains a telescopic ladder having a pattern structure in which the diameter of the cylindrical body increases toward the lower side among the telescopic ladders in which the cylindrical body sliding structure is partially incorporated.
Example 3 explains a telescopic ladder having a pattern structure in which the diameter of the cylindrical body decreases as it goes down, among the telescopic ladders in which the cylindrical body sliding structure is partially incorporated.
The fourth embodiment includes a lock mechanism and a lock release mechanism for temporarily fixing sliding of the cylindrical body when the expansion ladder is partially extended with respect to the telescopic ladder incorporating the cylindrical body sliding structure in part. The provided structure will be described.

FIG. 1 is a diagram schematically illustrating a basic configuration example of a first cylindrical body 110-1 having a throttle portion in the cylindrical body sliding structure 100 according to the first embodiment.
Fig.1 (a) is a figure which shows a mode that the outer fastening body 190 is attached with respect to the aperture | diaphragm | squeeze part in which the inner side bulging part 111 of the 1st cylindrical body 110-1 is provided. The upper side is a plan view. The outer tightening body 190 is shown only in the upper plan view.
FIG. 1B is a diagram illustrating a structure in which the outer tightening body 190 is attached and tightened. The upper side is a plan view.
The first cylindrical body 110-1 is a cylindrical column body made of metal or rigid plastic. As shown to Fig.1 (a), the inner side swelling part 111 is provided in a part of 1st cylindrical body 110-1, and it is restrict | squeezed from the outer side to the inner wall side. The inner bulging portion 111 is squeezed on the outer wall surface and bulges toward the inner wall surface. In the plan view on the upper side, the inner bulging portion 111 is visible on the inner wall surface side.

The outer fastening body 190 is a metal or rigid metal fitting, and is attached to the first cylindrical body 110-1.
In this example, the outer tightening body 190 is a ring-shaped metal fitting, which is divided into two parts on the left and right sides, and can be firmly fastened to the ring shape by the fastening metal 191.
The inner surface shape of the outer tightening body 190 includes a throttle portion filling portion 192 that fits into the concave shape of the throttle portion on the outer wall surface side of the inner bulging portion 111 of the first tubular body 110-1.
As shown in FIG. 1B, the throttle portion filling portion 192 of the outer tightening body 190 fits into a concave shape that is the throttle portion of the outer wall surface of the inner bulging portion 111 of the first cylindrical body 110-1. The inner bulging portion 111 is firmly clamped from the outside to the inside by the throttle portion filling portion 192 by fastening the outer fastening body 190 with the fastening bracket 191 from the outside, and the first cylindrical shape The structural strength is improved so that the inner bulging portion 111 of the body 110-1 does not collapse from the inner surface side and expand outward.
As shown in FIG. 1, the throttle portion filling portion 192 has an outer diameter integrated as a bulge inward on the inner wall surface of the cylindrical outer tightening body 190, and a throttle portion is formed on a part of the inner wall surface. The filling part 192 protrudes inward.
In addition, the example which comprises the aperture | diaphragm | squeeze part filling part 192 with an adhesive agent is mentioned later.

Next, the basic combination of the cylindrical body sliding structure of the present invention will be described.
As shown in FIG. 1, the cylindrical sliding structure has a second small diameter compared to the first cylindrical body 110-1 to which the outer fastening body 190 is attached and the structural strength is reinforced. The cylindrical body 110-2 is combined.
2 and 3 are diagrams showing two combination patterns of the cylindrical body sliding structure of the present invention.
FIG. 2 shows a combination pattern in which the second cylindrical body 110-2 having a small diameter is fixed, and the first cylindrical body 110-1 having a large diameter is slid and locked so as to cover from the top to the bottom. FIG.

First, the second cylindrical body 110-2 will be described.
The second cylindrical body 110-2 is a cylindrical columnar body made of metal or rigid plastic. The outer diameter of the second cylindrical body 110-2 is smaller than the inner diameter of the first cylindrical body 110-1, and can be inserted into the first cylindrical body 110-1.
As shown in the lower side of FIG. 2 (a), the second cylindrical body 110-2 is provided with an outer bulging portion 112 on a part of the second cylindrical body 110-2. It bulges towards the direction. The outer bulging portion 112 bulges from the inner wall surface side to the outer wall surface side.
The outer diameter of the outer bulging portion 112 is slightly smaller than the inner diameter of the first cylindrical body 110-1, and can be inserted into the first cylindrical body 110-1. The diameter is larger than the inner diameter of the inner bulging portion 111 on the inner wall surface of the first cylindrical body 110-1, and the diameter cannot pass through the inner bulging portion 111.

As shown in FIG. 2A, it is assumed that the second cylindrical body 110-2 is supported and fixed at an upper portion (not shown). The second cylindrical body 110-2 is covered so as to extrapolate the first cylindrical body 110-1 from above to below.
As shown in FIG. 2B, even if the first cylindrical body 110-1 is about to pass through the second cylindrical body 110-2 supported and fixed at the upper part, The outer bulging portion 112 of the body 110-2 is present, and the inner bulging portion 111 having a smaller diameter cannot pass through the outer bulging portion 112, and is locked by the outer bulging portion 112. Cannot be moved downward. Since the second cylindrical body 110-2 is supported and fixed at the upper part, the first cylindrical body 110-1 is locked and supported by the second cylindrical body 110-2.
In other words, the first tubular body 110-1 can slide downward until it is locked to the outer bulging portion 112 of the second tubular body 110-2. At the time of locking to the outer bulging portion 112 of the cylindrical body 110-2, sliding in the downward direction is restricted and stopped.

  Here, pressure is applied from the outer bulging portion 112 of the second cylindrical body 110-2 to the inner bulging portion 111 of the first cylindrical body 110-1, but the inner direction is increased by the outer fastening body 190. Therefore, there is no problem that the shape of the inner bulging portion 111 is crushed.

Next, a combination pattern in which the first cylindrical body 110-1 having a large diameter is fixed and the second cylindrical body 110-2 having a small diameter is slid from the top to the bottom will be described.
FIG. 3 is a diagram showing a combination pattern in which the first cylindrical body 110-1 having a large diameter is fixed and the second cylindrical body 110-2 having a small diameter is slid from the top to the bottom to be locked. It is.
The second cylindrical body 110-2 is the same as that of FIG. 2, and its outer diameter is smaller than the inner diameter of the first cylindrical body 110-1, and the second cylindrical body 110-. An outer bulging portion 112 is provided in a part of 2, and bulges outward.

As shown in FIG. 3A, it is assumed that the first cylindrical body 110-1 is supported and fixed at an upper portion (not shown). The first cylindrical body 110-1 is slid so as to pass through the second cylindrical body 110-2 from the upper side to the lower side.
As shown in FIG. 3B, even if the second cylindrical body 110-2 attempts to pass through the first cylindrical body 110-1 supported and fixed at the upper part, the first cylindrical body 110- 1 has an inner bulging portion 111, and the outer bulging portion 112 having a larger diameter cannot pass through the inner bulging portion 111 and is locked by the inner bulging portion 111. It cannot be moved. Since the first cylindrical body 110-1 is supported and fixed at the upper part, the second cylindrical body 110-2 is locked and supported by the first cylindrical body 110-1.
That is, the second cylindrical body 110-2 can slide downward until it engages with the inner bulging portion 111 of the first cylindrical body 110-1, but the first cylindrical body 110-2 slides. At the time of locking to the inner bulging portion 111 of the cylindrical body 110-1, sliding in the downward direction is restricted and stopped.

  Here, pressure is applied to the inner bulging portion 111 of the first tubular body 110-1 by the outer bulging portion 112 of the second tubular body 110-2 that is about to pass from above, It is firmly clamped and tightened in the inner direction by the tightening body 190, and there is no problem that the shape of the inner bulging portion 111 is crushed.

In the cylindrical body sliding structure of the present invention, the cylindrical bodies slide relative to each other up to a predetermined position regardless of the pattern shown in FIG. 2 or the pattern shown in FIG. Although it can slide, if the inner bulging portion 111 of the first cylindrical body 110-1 and the outer bulging portion 112 of the second cylindrical body are in a locked state, they cannot slide any further, and the slide The movement is limited and supported.
Next, a configuration example in which the throttle portion filling portion is formed with an adhesive will be described.
FIG. 4 is a diagram illustrating a configuration example in which the throttle portion filling portion is formed with an adhesive.
As shown in FIG. 4, the outer tightening body 190 'has a cylindrical shape, and is provided with an integrated throttle portion filling portion 192 bulging inward as in the configuration example shown in FIG. Absent.
As shown in FIG. 4, the outer tightening body 190 ′ is inserted into the first cylindrical body 110-1, and is inserted into the inner bulging portion 111 of the throttle portion and attached while being covered. The drawn portion filling portion 192 ′ is injected with an adhesive between the inner wall surface of the outer tightening body 190 ′ and the inner bulging portion 111 of the drawn portion of the first cylindrical body 110-1, and then dried and cured as it is. Let A resin molded body is formed by curing the adhesive. Since the narrowed portion filling portion 192 ′ is a hardened adhesive, it is firmly joined to both the inner wall surface of the outer tightening body 190 ′ and the inner bulging portion 111 of the first tubular body 110-1. The outer tightening body 190 ′ is fixed. In addition, the narrowed portion filling portion 192 ′ is a resin body that is hardened while entering the inner bulged portion 111 of the narrowed portion of the first cylindrical body 110-1, so that the inner bulged portion 111 is directed inwardly. Therefore, there is no problem that the shape of the inner bulging portion 111 is crushed.
The outer tightening body 190 ′ itself may be a simple cylindrical body, and after passing through the inner bulging portion of the throttle portion of the first cylindrical body, the inner bulge of the throttle portion of the first cylindrical body. Since the squeezed portion filling portion is formed simply by injecting an adhesive into the gap between the portion and the outer tightening body and drying it, the assembling work of the cylindrical body sliding structure of the present invention can be saved.
The inner wall surface of the outer tightening body 190 ′ is preferably a rough surface provided with grooves or irregularities. If the inner wall surface of the outer tightening body 190 ′ is a rough surface provided with grooves or irregularities, the adhesive strength of the resin body formed by curing the adhesive is improved.

As Example 2, a telescopic ladder that partially incorporates the cylindrical body sliding structure described in FIG. 2 of Example 1, and the diameter of the cylindrical body of the ladder basic member increases toward the lower side. What has a pattern structure will be described.
In the following description, it will be described as an extendable and retractable suspended ladder that can be extended by being suspended via a hook, but it is also applicable to an extendable ladder that extends upward from the ground. The ladder is not limited to a suspended type.
FIG. 5: has shown the rear view (surface which faces the wall surface side of a work location) of the expansion-contraction ladder 100 of the expansion | extension use condition concerning Example 2. FIG.
As shown on the right side of FIG. 5, the telescopic ladder 100 of the present invention has a ladder basic member 101 as a basic unit, and a plurality of ladders 100 are continuously combined in the vertical direction. Note that the ladder basic members 101 are slidable in the vertical direction, and the extendable ladder 100 as a whole is of an extendable type.

In this configuration example, the ladder basic member 101 of the basic unit is configured by eight stages, and in terms of the number of horizontal rails, ten stages including the lowest stage are provided. In this configuration example, a grip portion 180 is provided on the upper portion of the cylindrical support 110.
Note that the cylindrical body 110 of the ladder basic member 101 combined in the up-down direction is slid in FIG. 2 in relation to the upper ladder basic member 101. 1 and the cylindrical body of the upper ladder basic member 101 is the second cylindrical body 110-2 supported in FIG. 2, but in relation to the lower ladder basic member 101 The cylindrical body of the ladder basic member 101 at this stage becomes the second cylindrical body 110-2 supported in FIG. 2, and the cylindrical body of the ladder basic member 101 at the upper stage slides in FIG. It becomes the cylindrical body 110-1. Thus, the cylindrical body of the same one ladder basic member 101 becomes the sliding first cylindrical body 110-1 shown in FIG. 2 in relation to the upper stage, and shown in FIG. 2 in relation to the lower stage. Care must be taken to understand that the second cylindrical body 110-2 is supported.

As shown on the right side of FIG. 5, the ladder basic member 101 has a structure including a pair of cylindrical columnar bodies 110, a horizontal rail 120 provided between the cylindrical bodies 110, and an outer fastening body 190. Yes.
Each ladder base member 101 needs to have a certain degree of rigidity and strength. This is because the ladder basic member 101 is required to have mechanical strength to support the lifting and lowering of the worker as an extendable ladder at the work site. In addition, since the worker can move up and down while carrying a heavy load, it is necessary to withstand the load.
Although the length of the cylindrical support | pillar body 110 for every ladder basic | foundation member 101 is not specifically limited, What is necessary is just a length suitable for the stride at the time of a person raising / lowering step by step.
As shown in the left side of FIG. 5, the telescopic ladder 100 as a whole includes a ladder basic member 101 that is a basic structural unit, a latching tool 170, and a gripping part 180.

Hereinafter, each component will be described.
As shown in FIG. 5, the cylindrical column body 110 is a pair of column bodies that are arranged in parallel with each other at a predetermined interval. The material is preferably formed of a light metal such as aluminum and having a high structural strength.
In addition, in one cylindrical body 110, the inner side bulging part 111 is provided above, and the outer side bulging part 112 is provided below. The inner bulging portion 111 and the outer bulging portion 112 are the same as those shown in FIGS. 1 and 2.
An outer tightening body 190 is attached to the outer periphery of the upper inner bulging portion 111, and is firmly clamped from the outer peripheral side so that the shape of the inner bulging portion 111 is not crushed, and the structural strength is reinforced.

  The cylindrical strut 110 of the uppermost ladder basic member 101 is provided with a latch 170 described later. Further, in this configuration example, the gripping portion 180 is extended so that the height of the cylindrical support 110 of the uppermost ladder basic member 101 is higher than the position of the hook 170.

The horizontal rail 120 is a horizontally mounted member provided between the cylindrical support columns 110, and is a portion on which an operator places his / her feet when moving up and down. The horizontal rail 120 is one level of the ladder of the telescopic ladder 100. In this example, it is an example in which the crosspiece 120 is provided so as to connect the vicinity of the upper ends of the cylindrical support columns 110 of the ladder basic member 101.
The material of the horizontal rail 120 is preferably formed of a light metal such as aluminum and having a high structural strength. The crosspiece 120 needs to have a certain degree of rigidity and strength. This is because the mechanical strength that supports the lifting and lowering of the worker is required. In addition, since the worker can move up and down while carrying a heavy load, it is necessary to withstand the load.
The horizontal length of the horizontal rail 120 is not particularly limited, but it is necessary to have at least a length about the width of a human waist as long as it is assumed that an operator moves up and down one by one.

  The latching tool 170 is a member that latches the ladder main body 110 in order to suspend it from the suspended position. The shape of the latching tool 170 is not particularly limited as long as it is easy to hang. However, in this configuration example, it is U-shaped and has a structure that can be easily latched against the edge of an opening such as a manhole. .

  The gripping portion 180 is provided so as to be easily lifted and lowered using a ladder suspended from the suspended portion. If the gripping part 180 is extended with the cylindrical support 110 of the uppermost ladder basic member 101 facing upward, safety can be easily ensured and the work efficiency can be improved if the operator grips the gripping part 180. There is a merit.

Next, a mechanism for extending and shortening the telescopic ladder by sliding between the ladder basic members 101 will be described.
Each of the ladder basic members 101 is provided such that the diameter of the cylindrical portion of the cylindrical support 110 is sequentially increased from the uppermost ladder basic member 101 to the lowermost ladder basic member 101. They are nested, and are sequentially connected so as to be slidable in the cylinder axis direction of the cylindrical support 110. In other words, the cylindrical column 110 of the lower ladder basic member 101 directly below the cylindrical column 110 of the ladder basic member 101 of the current stage is one size larger than the cylindrical column. Nested.
The cylindrical portion of the cylindrical strut body 110 of the ladder basic member 101 of the current stage can be slid into and out of the cylindrical portion of the cylindrical strut body 110 of the lower ladder basic member 101, and It will be in an extended state by pulling out, and will be in a shortened state by being pushed upward. When all the ladder basic members 101 at each stage are in the shortened state, the entire telescopic ladder 100 is in the shortened storage state, and when all the ladder basic members 101 at each stage are in the extended state, the entire telescopic ladder 100 is also in the extended state. Become.

Next, a procedure for using the telescopic ladder 100 of the present invention will be described with reference to FIGS.
FIG. 6 is a diagram for explaining a procedure for expanding the telescopic ladder 100 in the shortened storage state from the shortened storage state to the extended use state.
A worker or the like transports the telescopic ladder 100 of the present invention in a shortened storage state and carries it into a suspended location, and in the suspended location such as the edge of a manhole serving as a working location, the operator enters the second embodiment via the latch 170. The telescopic ladder 100 is suspended.

As shown in the state of FIG. 6A, the worker suspends the telescopic ladder 100 via the hook 170.
The ladder basic members 101 at each stage slide with each other, the cylindrical bodies 110 slide together, start dropping by gravity, and extend downward.

  First, the cylindrical body 110 of the uppermost ladder basic member 101 is supported via a hook 170 and functions as the second cylindrical body 110-2 in FIG. The cylindrical body 110 of the ladder base member 101 at the lower stage (second stage from the top), which is one lower, slides downward as the first cylindrical body 110-1 in FIG. As the sliding progresses, the inner bulging portion 111 does not pass through the outer bulging portion 112 and is locked by sliding as shown in the right view of FIG. 2B and FIG. Is restricted and the suspension is supported.

  Here, all the weights of the ladder basic members 101 from the second to the eighth stage from the top are temporarily in the inner bulging portion 111 above the cylindrical body 110 of the second stage ladder basic member 101 from the top. The outer tightening body 190 is attached to the outer periphery of the inner bulging portion 111 and is firmly clamped from the outer peripheral side so that the shape of the inner bulging portion 111 is not crushed. Strength is reinforced.

  Next, when the cylindrical body 110 of the ladder basic member 101 in the second stage from the top is in a suspended support state, as shown in the right side of FIG. 2 and FIG. 6B, the second cylindrical body 110- 2, the cylindrical body 110 of the ladder basic member 101 in the lower stage (the third stage from the top), which is one below, slides downward as the first cylindrical body 110-1 in FIG. go. The sliding due to the sliding and the stop due to the sliding restriction are interlocked, and the ladder basic member 101 is expanded and extended from the top one after another.

FIG. 6B is a diagram showing a state in the middle of extending the telescopic ladder 100.
The ladder basic member 101 at each stage slides downward according to gravity. In the process, the inner bulging portion 111 is gradually moved by the outer bulging portion 112 from the cylindrical body 110 of the ladder basic member 101 on the upper stage side. The sliding is limited by being locked by the.
When all the ladder basic members 101 are extended, the extendable ladder 100 is in an extended use state.

Next, a procedure will be described in which the use of the telescopic ladder 100 at the work site is completed and the telescopic ladder 100 in the extended use state is brought into the shortened storage state.
FIG. 7 is a diagram illustrating a procedure for collecting the telescopic ladder 100 in the extended use state and changing it to the shortened storage state.
When the worker or the like finishes using the telescopic ladder 100 at a work site such as a manhole, the workers should move up the telescopic ladder 100 and move to the suspended position, and then collect the telescopic ladder 100 of the present invention. , Start collecting work.

The worker slides upward from the lower ladder basic member from the state of FIG.
In this example, since the lowermost stage is the fixed horizontal rail 121, it is raised from the ladder basic member 101 of the upper stage. The ladder basic member 101 cylindrical body 110 corresponds to the first cylindrical body 110-1 in FIG. 2, and one upper cylindrical body is suspended from the second cylindrical body 110-2. Has been. When the cylindrical body 110 of the ladder basic member 101 is pushed upward, the inner bulging portion 111 and the outer bulging portion 112 are unlocked and slid upward as they are.
As the sliding progresses, the horizontal beam 120 eventually comes into contact with the upper horizontal beam 120 (the third from the bottom), and the ladder basic member 101 can be pushed up.

Next, when the cylindrical body 110 of the ladder basic member 101 at the third stage from the bottom slides and slides upward, the cylindrical body 110 of the ladder basic member 101 at the current stage becomes the first cylindrical body. The cylindrical body 110 of the ladder basic member 101 in the upper stage becomes a second cylindrical body 110-2 that is suspended and supported.
The sliding by such sliding and the contact with the upper horizontal rail 120 are interlocked, and the ladder basic member 101 is successively shortened from the bottom and stored.
FIG. 7B is a diagram showing a state in the middle of shortening the telescopic ladder 100.
If all the ladder basic members 101 are shortened, the telescopic ladder is in a shortened storage state.

  As described above, when the cylindrical body 110 of the ladder basic member 101 slides, the inner bulging portion 111 of the cylindrical body 110 of each stage temporarily receives the weight of all the ladder basic members 101 below it. However, the outer tightening body 190 is attached to the outer periphery of the inner bulging portion 111 of each step, and the inner bulging portion 111 is firmly attached from the outer peripheral side so as not to be crushed. It is sandwiched and structural strength is reinforced.

Example 3 explains the telescopic ladder having the structure of the pattern in which the diameter of the cylindrical body decreases as it goes down, among the telescopic ladders partially incorporating the cylindrical body sliding structure shown in Example 1. To do. In addition, the description here is abbreviate | omitted suitably about the part similar to Example 2. FIG.
FIG. 8: has shown the rear view (surface which faces the wall surface side of a work location) of the expansion-contraction ladder 100 of the expansion | extension use condition concerning Example 3. FIG.
As shown on the right side of FIG. 8, the telescopic ladder 100 of the present invention has a ladder basic member 101 as a basic unit, and a plurality of ladders 100 are continuously combined in the vertical direction. The horizontal rail 120 is configured to connect the vicinity of the lower ends of the left and right cylindrical bodies 110. Note that the ladder basic members 101 are slidable in the vertical direction, and the extendable ladder 100 as a whole is of an extendable type.
In this configuration example, the ladder basic member 101 of the basic unit is configured by eight stages, and in terms of the number of horizontal rails, ten stages including the lowest stage are provided. In this configuration example, a grip portion 180 is provided on the upper portion of the cylindrical support 110.

  It should be noted that the cylindrical body 110 of the ladder basic member 101 combined in the up-down direction is related to the upper ladder basic member 101, and the cylindrical body of the ladder basic member 101 at this stage slides in FIG. 1 is a cylindrical body 110-1, and the cylindrical body of the upper ladder basic member 101 is the second cylindrical body 110-2 supported in FIG. Further, in the relationship with the lower ladder basic member 101, the cylindrical body of the ladder basic member 101 at this stage is the second cylindrical body 110-2 supported in FIG. The cylindrical body becomes the sliding first cylindrical body 110-1 in FIG. Thus, the cylindrical body of the same one ladder basic member 101 becomes the sliding first cylindrical body 110-1 shown in FIG. 3 in relation to the upper stage, and the support shown in FIG. 3 in relation to the lower stage. Care must be taken to understand that the second cylindrical body 110-2 is formed.

As shown on the right side of FIG. 8, the ladder basic member 101 has a structure including a pair of cylindrical columnar bodies 110, a horizontal rail 120 provided between the cylindrical bodies 110, and an outer fastening body 190. Yes.
In this configuration example, the outer bulging portion 112 is provided near the upper portion of the cylindrical body 110, the inner bulging portion 111 is provided near the lower portion, and the outer fastening body 190 is attached to the inner bulging portion 111. The inner bulging portion 111 is firmly clamped from the outer peripheral side so that the shape of the inner bulging portion 111 is not crushed, and the structural strength is reinforced.
The inner bulging portion 111 and the outer bulging portion 112 are the same as those shown in FIGS. 1 and 2.
The horizontal bar 120 is provided so as to connect the vicinity of the lower ends of the cylindrical body 110.

A mechanism for extending and shortening the telescopic ladder by sliding between the ladder basic members 101 will be described.
Each of the ladder basic members 101 is provided such that the diameter of the cylindrical portion of the cylindrical support 110 is sequentially reduced from the uppermost ladder basic member 101 to the lowermost ladder basic member 101. They are nested, and are sequentially connected so as to be slidable in the cylinder axis direction of the cylindrical support 110. That is, the cylindrical column 110 of the lower ladder basic member 101 located immediately below the cylindrical column 110 of the ladder basic member 101 of the current stage is slightly smaller in size. Nested.

  The cylindrical portion of the cylindrical strut body 110 of the ladder basic member 101 of the current stage can be slid in and out so as to be inserted into the cylindrical portion of the cylindrical strut body 110 of the upper ladder basic member 101. It is in an extended state by pulling out downward, and in a shortened state by pushing upward. When all the ladder basic members 101 at each stage are in the shortened state, the entire telescopic ladder 100 is in the shortened storage state, and when all the ladder basic members 101 at each stage are in the extended state, the entire telescopic ladder 100 is also in the extended state. Become.

Next, a procedure for using the telescopic ladder 100 of the present invention will be described with reference to FIGS. 9 and 10.
FIG. 9 is a diagram for explaining a procedure in which the telescopic ladder 100 in the shortened storage state is suspended from the suspended position and deployed from the shortened storage state to be in the extended use state.
A worker or the like transports the telescopic ladder 100 of the present invention in a shortened storage state and carries it into a suspended location, and in the suspended location such as the edge of a manhole serving as a working location, the operator enters the second embodiment via the latch 170. The telescopic ladder 100 is suspended.

As shown in the state of FIG. 9A, the worker suspends the telescopic ladder 100 via the hook 170.
The ladder basic members 101 at each stage slide with each other, the cylindrical bodies 110 slide together, start dropping by gravity, and extend downward.

  First, the cylindrical body 110 of the uppermost ladder basic member 101 is suspended and supported via a hook 170 and functions as the first cylindrical body 110-1 in FIG. The cylindrical body 110 of the ladder basic member 101 at the lower stage (second stage from the top), which is one level below, slides downward as the second cylindrical body 110-2 in FIG. As the sliding progresses, the outer bulging portion 112 does not pass through the inner bulging portion 111 and is locked as shown in the right view of FIG. 3B and FIG. Is restricted and the suspension is supported.

  Here, all the weight of the ladder basic member 101 from the second to the eighth stage from the top is temporarily applied to the inner bulging portion 111 below the cylindrical body 110 of the uppermost ladder basic member 101. However, the outer tightening body 190 is attached to the outer periphery of the inner bulging portion 111, and is firmly held from the outer peripheral side so that the shape of the inner bulging portion 111 is not crushed. Is reinforced.

  Next, when the cylindrical body 110 of the ladder basic member 101 in the second stage from the top is in the suspended support state, as shown in the right side of FIG. 3 and FIG. As the second cylindrical body 110-2 on the inner side in FIG. 3, the cylindrical body 110 of the ladder basic member 101 of the lower stage (third stage from the top) which is one body below becomes the body 110-1. Slide down. The sliding due to the sliding and the stop due to the sliding restriction are interlocked, and the ladder basic member 101 is expanded and extended from the top one after another.

FIG. 9B is a diagram showing a state in the middle of extending the telescopic ladder 100.
The ladder basic member 101 of each stage slides downward according to gravity. In the process, the cylindrical body 110 of the ladder basic member 101 on the lower stage side is changed from the cylindrical body 110 of the ladder basic member 101 on the upper stage side. The outer bulging portion 112 is locked inside by the inner bulging portion 111 and the sliding of each step is limited.
When all the ladder basic members 101 are extended, the extension ladder is in an extended usage state.

Next, a procedure will be described in which the use of the telescopic ladder 100 at the work site is completed and the telescopic ladder 100 in the extended use state is brought into the shortened storage state.
FIG. 10 is a diagram for explaining a procedure for collecting the telescopic ladder 100 in the extended use state and changing it to the shortened storage state.
When the worker or the like finishes using the telescopic ladder 100 at a work site such as a manhole, the workers should move up the telescopic ladder 100 and move to the suspended position, and then collect the telescopic ladder 100 of the present invention. , Start collecting work.

The worker slides upward from the lower ladder basic member from the state of FIG.
In this example, since the lowermost stage is the fixed horizontal rail 121, it is raised from the ladder basic member 101 of the upper stage. The ladder basic member 101 cylindrical body 110 corresponds to the second cylindrical body 110-2 in FIG. 3, and one upper cylindrical body is suspended and supported with respect to the first cylindrical body 110-1. Has been. When the cylindrical body 110 of the ladder basic member 101 in the second stage from the bottom is pushed upward, the flow reverses that in FIG. 3, and the inner bulging portion 111 and the outer bulging portion 112 are unlocked, and the upper portion is moved upward Slide and rise.
As the sliding progresses, the horizontal beam 120 eventually comes into contact with the upper horizontal beam 120 (the third from the bottom), and the ladder basic member 101 can be pushed up.

Next, the cylindrical body 110 of the ladder basic member 101 at the third level from the bottom becomes the second cylindrical body 110-2 and slides and slides upward, one of the upper levels (four levels from the bottom). The cylindrical body 110 of the ladder basic member 101 of the eye becomes a first cylindrical body 110-1 supported in a suspended state.
The sliding by such sliding and the contact with the upper horizontal rail 120 are interlocked, and the ladder basic member 101 is successively shortened from the bottom and stored.

FIG. 10B is a diagram showing a state in the middle of shortening the telescopic ladder 100.
If all the ladder basic members 101 are shortened, the telescopic ladder is in a shortened storage state.
As described above, when the cylindrical body 110 of the ladder basic member 101 slides, the inner bulging portion 111 of the cylindrical body 110 of each stage temporarily receives the weight of all the ladder basic members 101 below it. However, the outer tightening body 190 is attached to the outer periphery of the inner bulging portion 111 of each step, and the inner bulging portion 111 is firmly attached from the outer peripheral side so as not to be crushed. It is sandwiched and structural strength is reinforced.

As a fourth embodiment, there is provided a lock mechanism and a lock release mechanism for temporarily fixing the sliding of the cylindrical body when it is in an extended use state with respect to the telescopic ladder in which the cylindrical body sliding structure is partially incorporated. The provided structure will be described.
The ladder main body may be the same as that described in the second and third embodiments, and a description thereof is omitted here.
The lock mechanism 130 is a lock mechanism that temporarily locks the sliding movement between the ladder basic members 101 at the connection between the ladder basic members 101 at each stage when triggered by the extended use state.
The lock release mechanism 140 is a mechanism that releases the lock state of the lock mechanism 130 in response to an operation from the outside and makes the ladder basic members slidable.

FIG. 11 is a diagram simply illustrating a mechanism in which the lock is applied by the lock mechanism 130 at the joint portion of the ladder basic member 101 when the telescopic ladder 100 is deployed.
FIG. 12 is a diagram simply showing a mechanism for releasing the lock of the lock mechanism 130 by the lock release mechanism 140 of the joining portion of the ladder basic member 101 when the telescopic ladder 100 is collected.
11 and 12 show a part of the cylindrical column 110 facing the left end of the crosspiece 120, and a part is shown in a sectional view so that the internal structure can be easily understood. . The size of the diameter of the cylindrical portion of the cylindrical column 110 increases as it goes down, and the upper cylindrical column 110 is inserted into the cylindrical column 110 in a nested manner. It has become.
Although not shown, the right end portion of the horizontal rail 120 is also provided with a similar structure that is symmetrical with respect to FIGS.

As shown in FIG. 11, an insertion pin 131 and a biasing spring 132 that are biased so as to protrude are provided inside the left end portion of the horizontal rail 120, and a part of the cylindrical column 110 is A fitting hole 111 is formed. In this manner, the insertion pin 131 is biased on the left side, and is formed so as to protrude and be able to be inserted when it comes to the position of the insertion hole 111.
Further, a lock release mechanism 140 is rotatably connected to a part of the insertion pin 131 via a rotation joint portion 143. Although the operation of the insertion pin 131 is an operation of sliding in the horizontal direction, as shown in FIG. 11, the lock release mechanism 140 can be rotated in the vertical plane via the rotary joint 143 and the rotary shaft 142. It is converted, and the lever structure 141 is operated to protrude downward by rotating counterclockwise or to be stored upward by rotating clockwise.

First, a mechanism for locking by the lock mechanism 130 will be described in detail.
As shown in FIG. 11 (a), when the ladder basic member 101 falls downward due to gravity, when the tip of the insertion pin 131 reaches the insertion hole 111, the biasing force is applied as shown in FIG. 11 (b). The insertion pin 131 protrudes by the urging force of the spring 132 and is inserted into the insertion hole 111. Therefore, as shown in FIG. 11 (b), when the insertion pin 131 comes to a position where the insertion hole 111 is located, the insertion pin 131 protrudes by the urging of the urging spring 132, and as shown in FIG. 11 (c), The tip of the insertion pin 131 is inserted into the insertion hole 111, and the ladder basic member 101 is fixed so as not to slide in the extended use state.

In this series of movements, the lock release mechanism 140 is interlocked with the insertion pin 131 via the rotation joint portion 143, rotates in the vertical direction about the rotation shaft 142, and the lever structure 141 moves downward. A protruding operation is performed.
FIG. 11 shows only the movement of one step of the horizontal rail. However, the ladder basic member 101 of each step is dropped by the gravity of the telescopic ladder 100 due to the gravity. The lock by the lock mechanism 130 is applied one after another to enter the extended use state.

Next, a mechanism for unlocking the horizontal rail by the lock release mechanism 140 at each stage when the telescopic ladder 100 is collected will be described.
At the end of use of the telescopic ladder 100, the state where the insertion pin 131 is pushed into the insertion hole 111 of the left cylindrical column 110 by the biasing spring 132 is maintained as shown in FIG. Is hanging.

Here, as shown in FIG. 12B, the unlocking mechanism 140 rotates about the rotation shaft 142 clockwise with the operation of pushing the lever structure 141 upward from the outside, and the insertion pin 131 The pivot joint 143 that is linked to the center moves to the center side as the lever action point, and the fitting pin 131 slides to the center side in conjunction with the lever. As a result, the lock mechanism 130 is unlocked.
Here, although not shown in FIG. 12B, as will be described later, if the lower crosspiece 120 rises from below and collides against the lever structure 141, the operation lever structure 141 described above. Will be pushed upward.

When the lock mechanism 130 is unlocked by the lock release mechanism 140, the horizontal rail 120 at this stage can slide with respect to the cylindrical column 110 as shown in FIG. Here, since the lower horizontal rail 120 rises from below and collides against the lever structure 141, and a force for pulling up from below works, the ladder basic member 101 at this stage rises as it is.
The above-described operations shown in FIGS. 11 and 12 are executed at each stage, and the entire telescopic ladder is in an extended use state or a shortened storage state.

  While the preferred embodiment of the invention has been illustrated and described, it will be appreciated that various changes can be made without departing from the scope of the invention. Therefore, the technical scope of the present invention is limited only by the description of the appended claims.

  The telescopic ladder according to the present invention is used as a telescopic ladder for work used in a work place such as a manhole, an emergency telescopic ladder that escapes from a vehicle in an abnormal situation of a train vehicle, or an abnormality from a veranda such as an apartment or a hotel. It can be widely applied as a telescopic ladder for evacuation that sometimes evacuates.

DESCRIPTION OF SYMBOLS 100 Telescopic ladder 110 Cylindrical support | pillar body 111 Inner bulging part 112 Outer bulging part 120 Horizontal beam 130 Lock mechanism 140 Unlocking mechanism 170 Latch 180 Grasping part 190 Outer body

Claims (10)

A first tubular body;
A second cylindrical body having an outer diameter slightly smaller than the inner diameter of the first cylindrical body and capable of being inserted into the first cylindrical body;
An aperture portion provided in a part of the first cylindrical body, and an inner bulging portion provided so as to bulge inside the inner wall surface;
An bulging portion provided in a part of the second cylindrical body, and an outer bulging portion provided to bulge outside the outer wall surface;
The throttle portion is attached from the outer periphery to the inner bulge portion of the throttle portion of the first tubular body, and supports a throttle portion filling portion that fits into a throttle shape on the outer wall surface side of the inner bulge portion, A cylindrical body sliding structure comprising an outer tightening body that is tightened from the outside while being fitted in a shape to improve the structural strength of the inner bulge portion.   2. The cylindrical body sliding structure according to claim 1, wherein the throttle portion filling portion is integrated as a bulging portion of the inner wall surface of the outer fastening body.   The throttle portion filling portion is formed by curing the adhesive injected between the inner wall surface of the outer fastening body and the inner bulging portion of the throttle portion of the first cylindrical body. It is a resin molding, The cylindrical body sliding structure of Claim 1 characterized by the above-mentioned.   The cylindrical body sliding structure according to claim 3, wherein an inner wall surface of the outer tightening body provided with the throttle portion filling portion is a rough surface provided with grooves or irregularities. The outer diameter of the outer bulge is larger than the inner diameter of the inner bulge,
The both portions of the first tubular body are locked as a relationship in which the outer bulged portion of the second cylindrical body cannot pass through the portion where the inner bulged portion is provided. The cylindrical body sliding structure according to any one of 1 to 4. The second cylindrical body is in a supported state;
The first tubular body is extrapolated from the upper side with respect to the second tubular body, and the inner bulging portion of the first tubular body to which the outer fastening body is attached is the second tubular body. The cylindrical body cannot pass through the outer bulging portion, and the first cylindrical body is locked to the second cylindrical body by locking the inner bulging portion and the outer bulging portion. The cylindrical body sliding structure according to claim 5, which can be performed. The first cylindrical body is in a supported state;
The second tubular body is inserted into the first tubular body from above, and the inner bulging portion of the first tubular body to which the outer fastening body is attached is connected to the second tubular body. The outer bulge portion of the cylindrical body cannot pass, and the second tubular body is locked to the first cylindrical body by the locking of the inner bulge portion and the outer bulge portion. The cylindrical body sliding structure according to claim 5, which can be performed. An extendable ladder applying a part of the cylindrical body sliding structure according to claim 6,
A ladder basic member including a pair of cylindrical bodies arranged in parallel with each other at a predetermined interval and a horizontal rail provided between the cylindrical bodies is a basic unit, and the ladder basic members are in the cylindrical shape. It is sequentially connected so as to be slidable in a nested state in the cylinder axis direction of the body, and has a shortened storage state in which the ladder basic member is slidably stored, and an extended use state in which the ladder basic member is slid and extended, In the extendable ladder that can be changed from the extended use state to the shortened storage state, the ladder basic members of each stage slide and extend downward to enter the extended use state,
The throttle base is provided near the upper part of the cylindrical body of the ladder basic member at the current stage, the inner bulging portion and the outer fastening body are provided, and the lower part of the cylindrical body of the ladder basic member on the upper stage side Providing the outer bulging portion in the vicinity, the relationship between the first cylindrical body and the second cylindrical body,
The ladder basic member at this stage can be slid up and down with respect to the ladder basic member on the upper side, and can be extended until the inner bulging portion and the outer bulging portion are engaged with each other. Telescopic ladder. An expandable / contractible ladder that is partially applied to the cylindrical body sliding structure according to claim 7,
A ladder basic member including a pair of cylindrical bodies arranged in parallel with each other at a predetermined interval and a horizontal rail provided between the cylindrical bodies is a basic unit, and the ladder basic members are in the cylindrical shape. It is sequentially connected so as to be slidable in a nested state in the cylinder axis direction of the body, and has a shortened storage state in which the ladder basic member is slidably stored, and an extended use state in which the ladder basic member is slid and extended, In the extendable telescopic ladder that can be changed from the extended use state to the shortened storage state, the ladder basic members of each stage slide and extend downward to enter the extended use state,
The throttle part is provided near the lower part of the cylindrical body of the ladder basic member of the current stage, the inner bulging portion and the outer fastening body are provided, and the upper part of the cylindrical body of the ladder basic member on the upper stage side Providing the outer bulging portion in the vicinity, the relationship between the first cylindrical body and the second cylindrical body,
The ladder basic member at this stage can be slid up and down with respect to the ladder basic member on the upper side, and can be extended until the inner bulging portion and the outer bulging portion are engaged with each other. Telescopic ladder. In a state where the inner bulge portion and the outer bulge portion are engaged with each other, a lock mechanism that temporarily fixes the ladder basic members to be non-slidable,
10. The lock release mechanism according to claim 8, further comprising: a lock release mechanism that releases the lock state of the lock mechanism in response to an operation from the outside, and that allows the ladder basic members of the current stage and the lower stage to slide. The telescopic ladder described.

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