JP2023034787A - Telescopic ladder with telescopic handrail - Google Patents

Abstract

To provide a ladder having a configuration which can be easily extended for use, can be easily shortened for storage at the time of recovery after use, and can also extend and contract a handrail body.SOLUTION: A ladder base member 101 including a pair of cylindrical strut bodies 110 and a horizontal cross-piece body 120 is used as a base unit, and the cylindrical strut bodies 110 of respective stages are successively connected slidably in the direction of a cylindrical axis, and a shortened storage state and an extended use state are provided. A lock mechanism 130 for temporarily fixing the ladder base members 101 so as not to be slidable and a lock release mechanism 140 for releasing the lock state of the lock mechanism 130 so as to be slidable are provided, and a cylindrical handrail body 150 is also assembled in a slidable manner. The handrail body 150 is also rotatable in the horizontal direction, and in the lock mechanism, a fitting pin 131 is fitted into a fitting hole 152 of the handrail body 150 while allowing the handrail body 150 to freely slide, extend, and rotate in the horizontal direction.SELECTED DRAWING: Figure 1

Description

There is an application for exception to loss of novelty

The present invention relates to a longitudinally telescopic ladder. In particular, the present invention relates to a ladder provided with a handrail body, which is also telescopic.

Hanging ladders are widely used for work such as manholes. Here, the hanging ladder for work is not fixed to the wall in normal times, but is dynamically hung from the hanging point when in use, and is removed from the hanging point and collected when use is finished. It points to a ladder of type. For example, a hanging ladder for work that is hung from a hanging point during work as a means of moving down from a high place to a lower work site, or an emergency ladder that needs to be evacuated to the outside such as a building or train. Sometimes, as an escape means for evacuating downward, there is a hanging ladder for evacuation that is hung from a hanging point. In addition, there may be various variations depending on the application.

Several constructions are known in the prior art for hanging ladders.
For example, an evacuation ladder disclosed in Japanese Patent Application Laid-Open No. 2006-299800 (Patent Document 1) is known. As shown in FIG. 14, this evacuation ladder consists of two horizontal beams 1 vertically adjacent to each other. Collapsible vertical members 2 connect the ends of the vertical beams 1 to each other. and connected to the horizontal beam by connecting pins 4 so that the vertical member is folded and stored inside the horizontal beam when not in use. When the tip of the spring spring attached to the connecting pin of the material and the horizontal beam touches the tip of the extended end and is slightly pushed back inward, when the evacuation ladder is put away after use, the vertical material will move inward. It is devised so that it can be folded reliably and easily.
The evacuation ladder of Patent Literature 1 does not have a member such as a handrail on the upper part that the user grips by hand.

For example, a work suspension ladder for a work site of an excavation disclosed in Japanese Patent Application Laid-Open No. 2012-255275 (Patent Document 2) is known. As shown in FIG. 15, the hanging ladder for work at an excavated trench site of Patent Document 2 is a ladder 10 that is used by being suspended from the upper end of an excavated trench at a work site. 2, and changes between a use state 1L in which each horizontal bar 1 extends in a direction perpendicular to the vertical bar 2 and a stored state 1M in which the vertical bar 2 is folded in the same direction. It is possible to reduce the protrusion of the horizontal beam 1 in the stored state 1M.
The suspension ladder for work at the digging trench site of Patent Document 2 has a structure in which a handrail body 6a is provided on the upper part for the convenience of workers.

Next, for example, an extendable ladder disclosed in Japanese Patent Application Laid-Open No. 2019-173466 (Patent Document 3) is known. As shown in FIG. 16, the telescopic ladder of Patent Document 3 is a ladder 10 used in a work site such as a manhole, and includes a pair of cylindrical struts and a lateral support provided between the cylindrical struts. A ladder basic member 10-1 provided with a crosspiece is used as a basic unit, and the ladder basic members 10-1 are sequentially connected to each other so as to be slidable in a nested state in the cylinder axis direction of the tubular strut body, and the ladder basic member 10 -1 is slidably retracted in a shortened retracted state and an extended use state in which the ladder base member 10-1 is slidably extended. Further, a handrail body 15 is provided, and the handrail body 15 is also provided with a structure that can be extended and contracted with respect to the uppermost ladder basic member 10-1.

Such hanging ladders are required to have various structures and features depending on the application, but generally the following features are required.
The first feature is that it is compact when stored and is excellent in portability. It is required to be extendable, not to be bulky when stored (when not in use), to be in a compact and compact state for easy storage and storage, and to be light and excellent in portability when taken out and carried. .
The second feature is that the setting for use is easy. To easily extend and use by simply suspending from a suspension position.
The third feature is strength and stability during use. Structural strength is ensured so that the user's weight can be firmly supported when suspended from the suspension point, and the structure does not swing during use, making it easy to place one's feet on the crossbar. It is required that the convenience of use is ensured.
The fourth feature is that it is easy to return to the stored state after use. After being hung from the suspension position and used, it is necessary to restore the storage state again, but it is preferable that the recovery operation be simple.
A fifth feature is safety. In situations where the user is going up and down near the upper level, it is difficult to shift the weight of the ladder if there is nothing nearby to hold it by hand. In many cases, there is no handrail around the hanging area. The problem of safety, which is the fifth feature, is the same whether it is a hanging ladder that hangs from the bottom up or a hanging ladder that hangs from the top down.

JP-A-2001-315640 JP 2012-255275 A JP 2019-173466 A

Among the hanging ladders described above, the hanging ladder for work and the hanging ladder for evacuation have different strengths of demands for the features listed above.
Since the main purpose of the hanging ladder for evacuation is to evacuate in an emergency such as a fire, the second and third features are the most important, and the other first and fourth features are prioritized. is low.
However, for a hanging ladder for work, although the above second and third features are still important, from the viewpoint of work efficiency, the above first feature, fourth feature, and The fifth feature is also important.

The evacuation ladder installed on the veranda of the building disclosed in JP 2006-299800 of the above-mentioned Patent Document 1 is compact when stored, which is the first feature, and is excellent in portability. is satisfied, and the second point of ease of setting for use is also satisfied, but the third feature, stability and convenience during use, is lacking. As a whole, it is easy to swing, and the area of the crosspiece is small, so when it is hung along the wall surface, it is difficult to put one's feet on the crosspiece. As for the fourth characteristic, easiness of returning to the storage state after the end of use, although some measures have been taken, it is still not easy. In general, escape ladders do not meet the third and fourth characteristics. Furthermore, there is no handrail on the top rung for the user to grasp, and the fifth feature is not satisfied.

Next, the work suspension ladder for the excavation work site disclosed in Japanese Patent Application Laid-Open No. 2012-255275 of Patent Document 2 satisfies the above second feature, third feature, and fifth feature. However, it cannot be stretched in the length direction. In other words, since it does not expand and contract in the length direction, it does not satisfy the first and fourth characteristics, and it has to be brought to the site with the same length and used, and then removed and collected with the same length after use. It can be used for excavated trenches with a height of about 1 to 2m, but for sites where it is necessary to go up and down more than 3m (10m or more for deep ones) such as manholes, and for evacuation of buildings. There is a problem that it cannot be used on a veranda or the like.

Next, Japanese Patent Laid-Open No. 2019-173466 of Patent Document 3 satisfies all of the first to fifth characteristics, and is excellent as a work ladder. The provision of the extendable handrail body 15 can also be highly evaluated.
Here, since the user moves up and down while stepping on the horizontal beam 12 near the upper end of the ladder body, the handrail body 15 is left and right independent and cylindrical or rod-shaped. A horizontal rail that connects the left and right handrail bodies cannot be provided. In other words, left and right are independent. Therefore, if the handrail body 15 itself is simply telescopic so that it can slide relative to the ladder body, it is necessary to ensure the stability of the lock mechanism.
In the case of the locking mechanism of the ladder base member 10-1, the left and right cylindrical struts 11 are connected by the cross beam 12, so that the lower ladder base member 10-1 cannot be rotated around the support shaft. In directional expansion and contraction, the relative movement of the upper and lower ladder basic members 10-1 is only in the vertical direction, and there is little play around the support shaft and is stable.
Also, in the locking mechanism of the handrail body 15, the relative movement of the uppermost ladder basic member 10-1 is only in the vertical direction. In other words, in Japanese Unexamined Patent Application Publication No. 2019-173466 of Patent Document 3, the insertion pin is cylindrical, and the insertion hole is assumed to be a circular hole with approximately the same diameter, so that the handrail body expands and contracts and slides upward. , are aligned so that the insertion pin can be reliably inserted into the insertion hole when both are positioned to face each other.

As described above, in Patent Document 3, the height and extension state of the extended handrail body are fixed. However, there are various conditions at work sites such as manholes, and it may be preferable that the height of the extended handrail body is adjustable or that the horizontal rotation state is adjustable.
The inventor, Takashi Teramoto, made it possible to adjust the height of the extended handrail body and to move it horizontally by making the handrail body slide on the uppermost ladder basic member not only vertically but also horizontally. It reminded me that the rotation state is adjustable.
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances. To provide a telescoping ladder with a telescoping handrail that can be extended in a plurality of ways.

In order to achieve the above object, the telescoping ladder with telescoping handrails of the present invention comprises a pair of cylindrical struts arranged in parallel with each other at a predetermined interval, and a horizontal rail provided between the cylindrical struts. is used as a basic unit, and the ladder basic members are sequentially connected to each other so as to be slidable in a nested state in the axial direction of the tubular support body, and the ladder basic members are slidably accommodated. A telescopic ladder body having a contracted storage state and an extended use state in which the ladder basic member is slid and extended, and either one of the left and right bodies has only one cylindrical body, or there are two bodies, the left and right, but the left and right are independent. and is slidably connected in the axial direction of the cylinder to the tubular strut of the ladder base member on the uppermost stage of the ladder body, and is slidably accommodated. A retractable handrail body having a retracted state and a slidably extended extended use state, and the ladder basic members of the current step and the lower step or the handrail body and the ladder basic member slide to the extended use state. a locking mechanism that temporarily locks both of them in a locked state, and an external operation that releases the locked state of the locking mechanism so that the ladder basic members of the current stage and the lower stage or the handrail body and an unlocking mechanism that puts the ladder base member in a slidable unlocked state, wherein the locking mechanism is composed of an urging elastic body incorporated in the ladder base member of each stage and the urging elastic body. The handrail comprises an insertion pin projecting under force and an insertion hole drilled in the tubular support body or the tubular body of the handrail body, wherein the insertion pin is fitted into the insertion hole. In the locking mechanism between the body and the uppermost ladder base member, the handrail body is vertically slidable and horizontally rotatable with respect to the cylindrical support member of the uppermost ladder base member. The extendable ladder with extendable handrail is characterized by being movable.
With the above basic structure, the handrail body can be moved along two axes, ie, the vertical direction and the horizontal direction. The handrail body can be slidably extended to be easily deployed to a position higher than the horizontal beam at the upper end, and the degree of freedom of the extended state of the handrail body is improved.

In addition, in the above-described basic configuration, it is preferable that a part of the cylindrical body of the handrail body is provided with a handhold member erected on a wall surface of the cylindrical body.
With the above configuration, if there is a handhold standing on the wall surface of the cylindrical body of the handrail, the operator can easily grasp the rotational position of the handrail about the support shaft. Even if it is difficult for a worker to grasp the handrail body and rotate it around the support shaft due to slippage, the handrail body can be moved while grasping the handhold body protruding from the surface of the cylindrical body. Both extension movement and horizontal rotation movement are operable.

Here, in the above-described basic configuration, there may be a structure in which a plurality of insertion holes for the handrail body are provided horizontally around the lock mechanism between the handrail body and the ladder base member on the uppermost step.
With the above device, the handrail body can be extended in a plurality of ways in the horizontal direction. For example, if four insertion holes are provided at every 90 degrees in the cylindrical body of the handrail body, there are four insertion holes at every 90 degrees into which the insertion pins are fitted, and four insertion holes are provided at every 90 degrees. There can be street extensions. In particular, if the handrail body is configured to protrude from a part of the handrail body to be gripped, the protruding angle of the handrail body can be selected from four states.

Next, in the above basic configuration, a plurality of insertion holes for the handrail body are provided in the locking mechanism between the handrail body and the ladder basic member on the uppermost step, and the heights of the respective insertion holes are different. There can be a structure to assume.
With the above device, the handrail body can be extended to a plurality of heights. For example, if there are four insertion holes provided in the cylindrical body of the handrail, each having a different height, there are four holes in the vertical direction: height 1, height 2, height 3, and height 4. Thus, there are four extension positions of the handrail body.

In the above-described basic configuration, a combination is also possible in which there are a plurality of locations where the insertion holes are drilled in the horizontal direction, and the locations are different in the height direction as well.
With the above-described device, for example, when sliding at an angle of 0 degrees, the insertion pin and the insertion hole are fitted at a position of height 1, and when sliding at an angle of 90 degrees, a height of 2 is achieved. If the fitting pin and the fitting hole are fitted to each other at the position of 180 degrees and slide at an angle of 180 degrees, the fitting pin and the fitting hole are fitted to each other at the position of height 3 and slide at an angle of 270 degrees. For example, the insertion pin and the insertion hole are engaged with each other at the position of height 4, and there are a plurality of heights in the extended state of the handrail body, and a plurality of states in the horizontal rotation, which can be selected.

Next, in the above-described basic configuration, in the lock mechanism of the handrail body, the insertion hole includes the horizontal hole and a vertical hole having a width for receiving the diameter of the insertion pin provided upward from the horizontal hole. can be configured.
With the above device, it is possible to secure a wide range in which the insertion pin fits into the insertion hole by sliding extension of the handrail body, and the insertion pin reliably fits into the insertion hole, improving work efficiency.

Further, in the locking mechanism of the handrail body, the insertion hole is provided with the horizontal hole and a vertical hole for receiving the diameter of the insertion pin extending upward from the horizontal hole. For example, it is an L-shaped insertion hole in which a vertical hole is provided at the end of a horizontal hole.
With the above device, the insertion pin fitted in the insertion hole can be reliably fixed. In other words, the insertion pin fitted in the insertion hole of the lateral hole of the L-shaped insertion hole is still rotatable in the direction of the support shaft and is not fixed at that stage, but the operator cannot move the handrail body around the support shaft. When it is rotated up to the end of the L-shaped insertion hole, it hits the vertical hole, and the insertion pin enters in the vertical direction and is securely fixed.
As for the movement of the handrail, as it expands upward, the insertion pin first fits into the horizontal hole of the L-shaped insertion hole, and at this stage the upward expansion stops, and the handrail continues to move. When it is turned around the support shaft, the insertion pin fits into the vertical hole of the L-shaped insertion hole, and moves along the final vertical hole, here, downward, to connect the insertion pin and the L-shaped insertion hole. stays in a stable position. That is, the handrail body is extended upward, and when the insertion pin is fitted into the L-shaped insertion hole, it is turned around the support shaft, and finally moved downward in the direction of gravity by the length of the vertical hole to complete it. lock to. As in the conventional art, perfect alignment is required to fit a cylindrical fitting pin into a circular fitting hole, but by making the fitting hole L-shaped, a locked state can be easily and reliably achieved.

Next, as the configuration of the lock mechanism, the following configuration is preferable.
In the locking mechanism of each stage other than the uppermost stage, the biasing force elastic body and the insertion pin are provided in the horizontal beam, and the insertion hole is formed in the outer wall surface of the cylindrical support member of the ladder basic member. When the insertion hole comes to a position facing the insertion pin by sliding the ladder base member in the vertical direction, the insertion pin moves from the horizontal beam to the insertion hole of the cylindrical strut body. The locked state is achieved by inserting the pin into the lock release mechanism, and the unlocked state is achieved by extracting the insertion pin from the insertion hole by the unlocking mechanism.
The locking mechanism between the handrail body and the uppermost ladder base member is such that the biasing force elastic body and the insertion pin are provided between the inner wall surface of the cylindrical support body and the outer wall surface of the handrail body. The fitting hole is formed in the outer wall surface of the handrail body, and the fitting hole faces the fitting pin by sliding in the vertical direction and rotating movement in the horizontal direction of the handrail body. When it reaches the position, the insertion pin is inserted into the insertion hole to enter the locked state, and the unlocking mechanism extracts the insertion pin from the insertion hole of the handrail body to release the lock. It is preferable that the structure is in a state.
With the above configuration, it is possible to easily switch between the locked state and the unlocked state of the lock mechanism between the handrail body and the uppermost ladder basic member, and between the uppermost and lower ladder basic members.

Next, in the above-described basic configuration, a plurality of projections are provided, and one or more of the cylindrical struts or the horizontal beams of the ladder main body are connected to the work site on the side opposite to the ascending/descending surface of the user. A projecting body attachment part for attaching the projecting body is provided on the leaning surface side, and the projecting body can be attached to the cylindrical strut body or the horizontal beam of the ladder body in the extended state. is preferred.
Due to the above device, when the extendable ladder with extendable handrail is too close to the wall of the work site when used in a work site such as a manhole, it is not possible to secure a space for the worker to put their feet on the horizontal beam, but a projecting body is provided. As a result, a distance corresponding to the length of the projecting body can be ensured between the wall surface of the work site and the telescoping ladder with telescoping handrail, thereby facilitating the ascending/descending motion of the worker.

Furthermore, the length of the projection body can be devised. It is preferable that the length of each projecting body is adjusted according to the mounting position on the ladder body. Here, assuming that one virtual plane is formed by connecting the tips of the projecting bodies, the entire ladder can be leaned at a predetermined angle when leaned against the work wall surface in an actual work site. In this state, the tips of the projecting bodies come into contact with the wall surface of the work site, and the leaning state is stabilized.

According to the telescopic ladder with telescopic handrails of the present invention, the handrail body can be freely slidably extended and horizontally rotated to increase the degree of freedom of movement of the handrail body. A plurality of lock states can be set by fitting the insertion pin from the uppermost horizontal beam.
In particular, by providing a plurality of handrail insertion holes in the cylindrical body of the handrail body in a horizontal direction, there are a plurality of horizontal states of the handrail body at the time of locking, and the drilling positions of the handrail body insertion holes. By providing a plurality of , there are a plurality of heights of the handrail body when locked. Moreover, it is also possible to combine the state of horizontal rotation and the height of the handrail body to make a plurality of combinations.
If the insertion hole has an L-shaped structure with a horizontal hole and a vertical hole, if the horizontal insertion hole of the L-shaped insertion hole is provided, the insertion pin can be fitted into the insertion hole by sliding extension of the handrail body. Further, by rotating and fitting the insertion pin into the vertical hole from the horizontal hole, the locked state can be reliably achieved.
In addition, if a projecting body is provided, a distance corresponding to the length of the projecting body can be reliably secured between the wall surface of the work site and the telescoping ladder with telescoping handrails, making it easy for workers to ascend and descend. becomes.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows typically the structural example of the extensible ladder with an extensible handrail 100 concerning Example 1 of this invention. It is a figure which shows the structural example in which the insertion hole 152 of the handrail body 150 is plural in the periphery of a horizontal direction. FIG. 10 is a diagram showing a configuration example in which a handrail body 150 has a plurality of insertion holes 152 around the horizontal direction, and the respective heights are different. 4 is a diagram showing an outline of the operation of the locking mechanism 130 and the unlocking mechanism 140 of each stage of the ladder body 102. FIG. FIG. 5 is a diagram showing an outline of the operation of the locking mechanism 130 and the unlocking mechanism 140 of each rung of the ladder body 102 when the ladder body 102 is extended. FIG. 10 is a diagram schematically showing the operation of the locking mechanism 130 and the unlocking mechanism 140 of each rung of the ladder body 102 during contraction. FIG. 11 is a diagram (part 1) for explaining the operation of locking when the fitting hole 152 is so-called L-shaped in the extensible ladder 100a with an extensible handrail according to the second embodiment; FIG. 12 is a diagram (part 2) for explaining the operation of locking when the fitting hole 152 is so-called L-shaped in the extensible ladder 100a with an extensible handrail according to the second embodiment; FIG. 11 is a diagram (Part 1) for explaining the unlocking operation when the fitting hole 152 of the telescopic ladder 100a with the telescopic handrail according to the second embodiment has a so-called L shape. FIG. 11 is a diagram (part 2) for explaining the unlocking operation when the fitting hole 152 of the extensible ladder 100a with an extensible handrail according to the second embodiment has a so-called L shape. It is a figure which shows the extensible ladder 100b with an extensible handrail concerning Example 3 (the 1). It is a figure which shows the extensible ladder 100b with an extensible handrail concerning Example 3 (part 2). FIG. 10 is a diagram showing a state in which the telescopic ladder with telescopic handrails 100b according to the third embodiment is leaned against the wall surface of the work site; FIG. 2 is a diagram showing an evacuation ladder installed on a veranda of a building disclosed in Japanese Patent Laying-Open No. 2006-299800 (Patent Document 1). FIG. 2 is a diagram showing a work suspension ladder for a work site of an excavation trench disclosed in Japanese Patent Application Laid-Open No. 2012-255275 (Patent Document 2). It is a diagram showing a telescopic ladder disclosed in Japanese Patent Application Laid-Open No. 2019-173466 (Patent Document 3).

Hereinafter, embodiments of the telescoping ladder with telescoping handrails of the present invention will be described with reference to the drawings.
Needless to say, the scope of the present invention is not limited to specific shapes, designs, numbers, angles, etc. shown in the following examples.
Example 1 is a configuration example to which an extendable handrail body is applied.
Example 2 is another configuration example to which an extendable handrail body is applied.
Example 3 is a configuration example in which a projecting body is applied to the back side of the ascending/descending surface of the extendable ladder with extendable handrail (the side facing the wall surface of the work site) together with the extendable handrail.

FIG. 1 is a diagram schematically showing a configuration example of an extensible ladder with an extensible handrail 100 according to Example 1 of the present invention.
FIG. 1 shows a front view (a surface on which a worker ascends and descends) and a side view of the telescopic ladder with telescopic handrails 100 in the expanded state, a front view of the telescopic ladder with telescopic handrails 100 in the contracted state, and a ladder basic member 101. Each figure is shown.
The structural example of the telescoping ladder with telescoping handrails 100 of the first embodiment is an example of a hanging ladder that is extended downward and deployed, but it can also be applied in principle to a hanging ladder that is extended and deployed upward. .
In this configuration example, the ladder basic member 101 of the basic unit is composed of eight steps, and in terms of the number of crossbars, nine steps including the lowest step are provided. The telescopic ladder with telescopic handrail 100 of the present invention is provided with a ladder body 102 and a handrail body 150 in which a plurality of ladder basic members 101 are continuously combined so as to be slidable in the vertical direction. , The ladder as a whole is telescopic.
As shown in FIG. 1, the ladder base member 101 includes a pair of left and right tubular struts 110, a crosspiece 120 provided between the tubular struts 110, a locking mechanism 130, and an unlocking mechanism. 140 and a handrail body 150. Although the lowermost horizontal bar is provided, a configuration without the horizontal bar is also possible.

The length of the telescopic ladder with telescopic handrails 100 is not limited, but if the depth of the work site such as a manhole is fixed, the length of the telescopic ladder with telescopic handrails 100 in the extended state is the depth of the work site. The length of the ladder body 102 reaches the bottom of the work site in the extended state, the top step of the ladder body 102 is near the ground of the work site, and the handrail body 150 can be extended to a position higher than the ground of the work site. length is preferred.

Each component will be described below.
As shown in FIG. 1, the tubular struts 110 are a pair of struts arranged in parallel with each other at a predetermined interval. The material is preferably a light metal such as aluminum having a high structural strength.
Each ladder base member 101 requires a certain degree of rigidity and strength. This is because the ladder basic member 101 is required to have mechanical strength to support the worker's ascending and descending as a ladder at the work site. In addition, it is possible that an operator may lift a load while carrying a somewhat heavy load, so it is necessary to withstand the load.
The length of the cylindrical support 110 for each ladder base member 101 is not particularly limited, but may be any length that is appropriate for the stride when a person ascends and descends one step at a time.
The ladder base member 101 of the uppermost stage has a cylindrical strut body 110 longer than that of the other stages. are provided.
As shown in FIG. 1 in the expanded state, the height of the dummy horizontal rails 121 is adjusted to match the spacing between the horizontal rails 120 on the other levels. The height is such that the interval between the beams 121 is approximately equal to the interval between the horizontal beams 120 of the other stage.
In addition, in the uppermost ladder base member 101, since the cylindrical strut body 110 is long, there is also a space for the cylindrical strut body 110 above the horizontal beam 121 that serves as a dummy, but in this example, as shown in FIG. In addition, a locking mechanism 130-1 and an unlocking mechanism 140-1 for the handrail body 150 are installed in the space. The reason for this is that if the locking mechanism 130-1 and the unlocking mechanism 140-1 for the handrail body 150 were installed at the position of the dummy horizontal beam 121, the handrail body 150 would slide up to that height. , there is a risk of batting with the second ladder base member from the top, and the length of the handrail body 150 must be shortened, and the length of the handrail body 150 cannot be sufficiently secured. Therefore, the cylindrical strut body 110 of the uppermost ladder basic member 101 is lengthened in order to secure a space further upward for the lock mechanism 130 and the unlock mechanism 140 for the handrail body 150 .

The horizontal rail 120 is a member that is horizontally suspended between the cylindrical support members 110, and is a portion on which a worker puts his or her feet when ascending or descending. The crossbar 120 is one step of the ladder 100. - 特許庁In this example, the cross beams 120 are provided so as to connect the vicinity of the upper ends of the cylindrical support bodies 110 of the ladder base member 101 . As will be described later, in this horizontal beam 120, a locking mechanism 130 and an unlocking mechanism 140 for the insertion hole 133 of the lower ladder base member 101 are provided. Details will be described later.
It is preferable that the horizontal beam 120 is made of a light metal such as aluminum having a high structural strength. The crossbar 120 requires a certain degree of rigidity and strength. This is because mechanical strength is required to support the lifting and lowering of the operator. In addition, it is possible that an operator may lift a load while carrying a somewhat heavy load, so it is necessary to withstand the load.
The horizontal length of the horizontal beam 120 is not particularly limited, but if it is assumed that each worker ascends and descends one by one, the horizontal beam should be at least about the width of a person's waist.
As described above, the uppermost horizontal beam 121 simply functions as a horizontal beam, and the lock mechanism 130-1 and the unlocking mechanism 140-1 for the insertion hole 152 of the handrail body 150 are provided therein. is not prepared.

Next, the ladder basic member 101 is formed by a pair of left and right hollow cylindrical struts 110 and horizontal beams 120 connecting between them. A locking mechanism 130 and an unlocking mechanism 140 for the hole 133 are provided.
The sliding between the ladder base members 101 will be described.
As shown in FIG. 1, each ladder base member 101 has a diameter of the tubular portion of the tubular strut 110 that decreases from the top ladder base member 101 to the bottom ladder base member 101. They are provided so as to become progressively smaller as the distance increases, and they are nested and connected sequentially so as to be slidable in the axial direction of the cylindrical support 110 . In other words, the cylindrical support 110 of the ladder base member 101 of the lower stage directly below has a size smaller than the cylindrical support 110 of the ladder base member 101 of the current stage. It has a nested structure that can be expanded and contracted.
The tubular portion of the tubular strut body 110 of the ladder basic member 101 of the current stage can slide in and out of the tubular portion of the tubular strut body 110 of the ladder basic member 101 of the lower stage. By pulling it out, it will be in an extended state, and by pushing it upwards, it will be in a shortened state. When all of the ladder base members 101 on each rung slide into a contracted state, the entire ladder 100 is put into a contracted and stored state. 100 as a whole is also in an extended state.

A telescopic structure is also provided between the handrail body 150 and the uppermost ladder basic member 101, and the handrail body 150 extends upward from the uppermost ladder basic member 101 to be in an extended state, and then retracts downward. shortened state.
Here, the left handrail body 150L and the right handrail body 150R have mutually independent structures, and each can rotate freely in the horizontal direction with respect to the uppermost ladder basic member 101. It has a structure that can be freely slid in the vertical direction, and has a high degree of freedom of movement. If the left handrail body 150L and the right handrail body 150R are connected to each other, they can only slide upward while maintaining the same height at the same time. Movement becomes impossible. In the present invention, the left handrail body 150L and the right handrail body 150R are independent from each other, and the handrail body 150 is arranged vertically with respect to the cylindrical support body 110 of the ladder basic member 101 on the uppermost step. It has a slidable and horizontally rotatable structure.
That is, the handrail body 150 can be moved vertically and horizontally, and has a structure capable of three-dimensional change. The handrail body 150 can be slidably extended to be easily deployed to a position higher than the ladder body 102, and the degree of freedom of the extended state of the handrail body is improved.

FIG. 2 is a diagram showing a configuration example in which a handrail body 150 includes a cylindrical body 151, an insertion hole 152, a handhold body 153, and a reference mark 154, and has a plurality of insertion holes 152 around the horizontal direction.
The handrail body 150 may be either one on the left or right, or a pair of left and right handrail bodies may be provided. Each is independent, and one handrail body 150 is one cylindrical one. In this example, the handrail body 150 has a structure with a left-right pair each. A part of the wall surface of the cylindrical body 151 is provided with a handle 153 that can be gripped by the operator. The handle 153 allows the operator to hold it during work, and the angle of the handrail 150 allows the user to easily grasp the rotational position of the cylindrical support 110 about its axis.

Further, as shown in FIG. 2, inside the tubular strut 110 of the uppermost ladder base member 101 that receives the handrail 150, a doughnut-shaped locking mechanism 130-1 and an unlocking mechanism 130-1 for the handrail 150 are provided. A mechanism 140-1 is provided. In this configuration example, a doughnut-shaped lid 111 is further provided at the upper end of the cylindrical support 110 of the uppermost ladder base member 101 .

At the bottom of FIG. 2(a), there is a diagram simply showing a longitudinal section of the doughnut-shaped locking mechanism 130-1 and unlocking mechanism 140-1 for the handrail body 150. As shown in FIG. In this example, the donut-shaped lock mechanism 130-1 is concentrated on the right side (the front side in FIG. 1). The structure is such that the handrail body 150 slides in the central space of the doughnut-shaped lock mechanism 130-1. A lock mechanism 130-1 is embedded in the doughnut-shaped interior, and is provided with an insertion pin 131 and an urging elastic body 132, similar to the lock mechanism 130 described later, and has an urging force so as to protrude toward the inner wall surface side. is attached. The handrail body 150 has an insertion hole 152. When the handrail body 150 slides and the insertion hole 152 comes to a position facing the insertion pin 131, the insertion pin 131 protrudes due to the biasing force and enters the insertion hole 152. It is designed to fit.
On the other hand, the unlocking mechanism 140-1 also has a wire connected to the insertion pin 131 in the same manner as the unlocking mechanism 140 described later, and by pulling the wire, the insertion pin 131 can be retracted to unlock. .

Next, the locking operation of the lock mechanism 130-1 with respect to the handrail body 150 and the unlocking operation of the unlocking mechanism 140-1 will be described.
In this example, as shown in FIG. 2, there are a plurality of insertion holes 152 (in this example, four holes are provided every 90 degrees of rotation), and the handrail body 150 can be freely moved horizontally and slid vertically. The insertion pin 131 of the lock mechanism 130-1 of the ladder base member 101 on the uppermost stage is fitted into one of the plurality of insertion holes 152 according to the rotation angle of the handrail body 150. . The fitting pin 131 is positioned to protrude from the right side of the cylindrical body 151 of the handrail body 150L in the drawing.

FIG. 2(a) shows fitting with the insertion pin 131 when the handrail body 150L is positioned at a rotation angle of 0 degrees, that is, at a reference angle. An insertion hole 152 corresponding to a rotation angle of 0 degrees faces and is positioned to face the insertion pin 131 of the lock mechanism 130-1. In this state, the handle 153 is parallel to the horizontal beam 120 of the ladder body 102 (on the back side in the drawing). A reference mark 154, which is provided so that the rotation angle can be easily recognized, faces the front side.
FIG. 2(b) shows fitting with the insertion pin 131 when the handrail body 150L is rotated by 90 degrees, that is, rotated by 90 degrees from the reference angle. An insertion hole 152 corresponding to a rotation angle of 90 degrees is positioned to face the insertion pin 131 of the lock mechanism 130-1. In this state, the handhold member 153 is rotated 90 degrees compared to FIG. A reference mark 154, which is provided so that the rotation angle can be easily recognized, faces the front side.
FIG. 2(c) shows fitting with the insertion pin 131 when the handrail body 150L is rotated 180 degrees, that is, rotated 180 degrees from the reference angle. An insertion hole 152 corresponding to a rotation angle of 180 degrees is positioned to face the insertion pin 131 of the lock mechanism 130-1. In this state, the handhold member 153 is rotated 180 degrees as compared with FIG. A reference mark 154, which is provided so that the rotation angle can be easily recognized, faces outward (to the left in the figure).
In FIG. 2, there is also a state in which the handrail body 150L, which is rotated by 90 degrees after FIG.
As shown in FIG. 2, there are a plurality of rotation angles of the handrail body 150L around the horizontal direction, and there are a plurality of variations of the handrail body 150 locked state.

Next, FIG. 3 shows a structure in which the handrail body 150 includes a cylindrical body 151, an insertion hole 152, a handhold body 153, and a reference mark 154. It is a figure which shows a different structural example.
As shown in FIG. 3, there are a plurality of insertion holes 152 (in this example, four holes are provided every 90 degrees of rotation), and the heights of the holes are different. The insertion pin 131 of the lock mechanism 130 of the ladder base member 101 on the uppermost stage is fitted into one of a plurality of insertion holes 152 having different heights according to the rotation angle of the handrail body 150. It's how it works. In FIG. 3, the insertion pin 131 of the lock mechanism 130-1 is positioned to protrude from the right side of the cylindrical body 151 of the handrail body 150L.

FIG. 3(a) shows fitting with the insertion pin 131 when the handrail body 150L is positioned at a rotation angle of 0 degrees, that is, at a reference angle. An insertion hole 152 corresponding to a rotation angle of 0 degrees is positioned to face the insertion pin 131 of the lock mechanism 130-1. In this state, the handle 153 is parallel to the cross beam 120 of the ladder body 102 and faces toward the center (right side in the figure). A reference mark 154, which is provided so that the rotation angle can be easily recognized, faces the center side (right side in the figure).
In this example, the insertion hole 152 corresponding to a rotation angle of 0 degrees is drilled at the lowest position. , the handrail body 150L continues to slide upward until it hits the insertion hole 152 drilled at the lowest position, and when it hits the insertion hole 152 as shown in FIG. It fits into the hole 152 and is locked. It can be seen that the handrail body 150L has slid to the highest position.

Next, FIG. 3(b) shows fitting with the insertion pin 131 when the handrail body 150L is rotated by 90 degrees, that is, rotated by 90 degrees from the reference angle. An insertion hole 152 corresponding to a rotation angle of 90 degrees faces the horizontal rail and is positioned to face the insertion pin 131 of the lock mechanism 130-1. In this state, the handhold member 153 is rotated by 90 degrees as compared with FIG. A reference mark 154, which is provided so that the rotation angle can be easily recognized, faces the front side.
In this example, the fitting hole 152 corresponding to a rotation angle of 90 degrees is drilled at the second lowest position. When moved, the handrail body 150L continues to slide upward until it hits the insertion hole 152 drilled at the second lowest position, and hits the insertion hole 152 as shown in FIG. 3(b). Then, the insertion pin 131 is inserted into the insertion hole 152 and locked. It can be seen that the handrail body 150L slides to the second highest position and the handhold body 152 faces the front in the figure.

Next, FIG. 3(c) shows fitting with the insertion pin 131 when the handrail body 150L is rotated by 180 degrees, that is, rotated by 180 degrees from the reference angle. An insertion hole 152 corresponding to a rotation angle of 180 degrees faces the lock mechanism 130-1, and is positioned to face the insertion pin 131 protruding from the horizontal beam with a biasing force. In this state, the handhold member 153 is rotated 180 degrees as compared with FIG. A reference mark 154, which is provided so that the rotation angle can be easily recognized, faces outward (to the left in the drawing).
In this example, an insertion hole 152 corresponding to a rotation angle of 180 degrees is drilled at the third lowest position. When moved, the handrail body 150L continues to slide upward until it hits the insertion hole 152 drilled at the third lowest position, and hits the insertion hole 152 as shown in FIG. 3(c). Then, the insertion pin 131 is inserted into the insertion hole 152 and locked. It can be seen that the handrail body 150L has slid to the third highest position, and the handhold body 153 faces leftward in the figure.

As shown in FIG. 3, the handrail body 150L has a plurality of rotation angles in the horizontal direction and a plurality in the height direction, and there are a plurality of variations in the locked state of the handrail body 150 in the horizontal direction and the height direction. becomes.

As described above, the handrail body 150 and the uppermost basic ladder member 101 slide vertically, and are locked by the locking mechanism 130 by fitting the insertion pin 131 and the insertion hole 152, and are locked in an extended state. It hangs. Similarly, the basic ladder members of each stage slide vertically, and are locked by the locking mechanism 130 by fitting the insertion pin 131 and the insertion hole 133, and are locked in the extended state.
The outline of the operation of the locking mechanism 130 and the unlocking mechanism 140 installed in the rungs 120 of the ladder base member 101 will be described in detail below.

FIG. 4 shows a configuration example in which a "wire-type locking mechanism type" is applied, in which the operation lever of the unlocking mechanism is incorporated in the front surface of the cross beam and protrudes, and interlocks with the movement of the insertion pin of the locking mechanism, in the basic ladder member. 101 is a diagram simply showing the extension operation of 101, the stop by locking, and the shortening operation by unlocking.
FIG. 4(a) shows a state in which the locking mechanism 130 is unlocked, and the cylindrical support 110 of the lower ladder base member 101 extends from the cylindrical support 110 of the upper ladder base member 101. It is in a state of being deployed.
FIG. 4B shows a state in which the lock mechanism 130 is activated and locked. The fitting pin 131 of the lock mechanism 130 in the lateral beam 120 of the upper ladder basic member 101 projects into the fitting hole 131 of the cylindrical strut body 110 of the lower ladder basic member 101 by biasing force, and the two are fitted. By doing so, the lock is applied and the extension is stopped.
FIG. 4(c) shows a state in which the unlocking mechanism 140 is activated and unlocked. By the lock release mechanism 140, the fitting pin 131 of the lock mechanism 130 in the lateral beam 120 of the upper ladder basic member 101 is released from the fitting hole 131 of the cylindrical support body 110 of the lower ladder basic member 101 against the urging force. The lock is released by returning and the engagement between the two is released, and the state is in a state of shortening.

As shown in FIG. 4, the operating lever 141 protrudes to the left and right of the surface of the horizontal rail 120, and a groove is provided for sliding the operating lever 141 to the left and right. 141 moves. As shown in FIG. 4B, when the operating lever 141 is slid outward, the lock mechanism 130, which will be described later, moves outward and is locked. As shown in FIG. 4(c), when the operation lever 141 is slid toward the center, the lock mechanism 130, which will be described later, moves toward the center and is unlocked.
4(a) to 4(b), the operation of the lock mechanism 130 for the extension operation and lock stop of the basic ladder member 101 will be examined in detail. 4(b) to 4(c), the operation of the unlocking mechanism 140 for unlocking and shortening the basic ladder member 101 will be examined in detail.

FIG. 5 is a diagram showing a mechanism of locking by the wire-type locking mechanism 130 of each stage during deployment and extension.
FIG. 6 is a diagram showing a mechanism of unlocking by the wire-type unlocking mechanism 140 of each stage when the collection is shortened.
The lock mechanism 130 is a lock mechanism that temporarily locks the sliding of the ladder base members 101 at the connection portion between the ladder base members 101 on each stage when the ladder base members 101 are extended and used. FIG. 3 is a diagram for explaining how the wire-type locking mechanism 130 of each stage operates and locks.

5 shows a part of the cylindrical strut body 110 facing the left end of the horizontal beam 120, and a part of it is shown in a sectional view so that the internal structure can be easily understood. The diameter of the cylindrical portion of the cylindrical support 110 gradually decreases as it goes downward, and the lower cylindrical support 110 is nested inside the upper cylindrical support 110 . It's becoming
Although not shown, the right end portion of the horizontal beam 120 is also provided with a similar structure that is bilaterally symmetrical to that of FIG.

As shown in FIG. 5, the lock mechanism 130 has a configuration including an insertion pin 131, an urging elastic body 132, and an insertion hole 133 in the configuration example of the first embodiment.
As shown in FIG. 5, a fitting pin 131 biased to protrude and a biasing elastic body 132 are provided inside the left end portion of the horizontal beam 120, and a part of the opposing cylindrical strut body 110 is provided. is formed with a fitting hole 133 . In this manner, the fitting pin 131 is pushed by the wall surface until it reaches the fitting hole 133 and is kept biased to the left.

As shown in FIG. 5(a), while the ladder base member 101 is being deployed and raised, when the tip of the insertion pin 131 reaches the insertion hole 133, as shown in FIG. The fitting pin 131 is projected by the biasing force of the body 132 and fitted into the fitting hole 133 . Therefore, as shown in FIG. 5(b), when the fitting pin 131 comes to the position where the fitting hole 133 is located, the fitting pin 131 protrudes due to the bias of the biasing elastic body 132, and as shown in FIG. 5(c). , the tip of the insertion pin 131 is inserted into the insertion hole 133, and the ladder basic member 101 is non-slidably fixed in the extended use state.

FIG. 5 shows only the movement of one rung. locks are applied one after another, resulting in an extended use state.
Here, FIG. 5 explains the extension operation and locking between the ladder base members 101. If the insertion hole 133 in FIG. 5 is replaced with the insertion hole 152 shown in FIGS. 150 and the top ladder base member 101 for extension and locking.

Next, the operation of unlocking mechanism 140 will be described in detail.
FIG. 6 is a diagram showing a mechanism of unlocking by the wire-type unlocking mechanism 140 of each stage when the collection is shortened.
Until immediately before the recovery of the ladder 100 is started, as shown in FIG. , is locked.

Here, as shown in FIG. 6B, if the lock lever is pulled toward the center (right side in the drawing), the interlocking fitting pin 131 moves toward the center (right side in the drawing). When the fitting pin 131 is removed from the fitting hole 133, the lock mechanism 130 is unlocked.

Next, when the lock of the lock mechanism 130 is released by the lock release mechanism 140, as shown in FIG. The cylindrical strut body 110 of 101 slides upward and shortens.
The above is the operation of the locking mechanism 130 and the unlocking mechanism 140 at each stage.

By the operation of the locking mechanism 130 and the unlocking mechanism 140, the ladder bodies 101 of each stage are extended by sliding and shortened by sliding, and the handrail body 150 and the ladder basic unit 101 of the uppermost stage slide. Extension by movement and shortening by sliding are performed.
Here, FIG. 6 explains the lock release and shortening operation between the ladder base members 101. If the insertion hole 133 in FIG. 6 is replaced with the insertion hole 152 shown in FIGS. The unlocking and retracting actions of the body 150 and the top ladder base member 101 are similar.

As a second embodiment, a configuration example in which an insertion hole having a shape different from that of the first embodiment shown in FIGS.
In the second embodiment, too, the handrail body 150a is inserted in the cylindrical strut body 110 of the uppermost ladder basic member 101 in the shortened state, and is slidable in the vertical direction until it is locked by the lock mechanism 130. and is rotatable around the support shaft.

7 and 8 are diagrams simply showing the relationship and movement between the handrail body 150 and the insertion pin 131 of the locking mechanism 130-1 of the uppermost ladder basic unit 101 during extension and deployment.
A simple configuration of the handrail body 150a according to the second embodiment is as shown in FIG. Only the parts related to the explanation in the figure are taken out, and the other parts are omitted. The posture of the handrail body 150a shown in FIG. 7 is the posture viewed from the center side of the ladder body 102. Therefore, the dowel pin 131 is drawn as a circle as a cross-section of a cylinder. Locking mechanism 130-1 is illustrated as a rectangular frame.
As shown in FIG. 7, the handrail body 150a according to the second embodiment includes a cylindrical body 151, an insertion hole 152a, and a handhold body 153 that can be gripped by a worker on a part of the wall surface of the cylindrical body 151. It has a structure.
This handhold member 153 makes it possible to easily grasp the rotational position of the uppermost ladder base member 101 of the handrail member 150 around the support shaft of the cylindrical support member 110 . In this example, as shown in FIG. 5(a), the basic shortened state is a state in which the handhold member 153 is parallel to the horizontal beam 120. As shown in FIG. It is a recommended basic operation to pull up from this stored state as it is.

The operation of the locking mechanism of the handrail body 150a will be described below.
In the second embodiment, the fitting hole 152a is a so-called L-shaped hole. That is, the laterally long lateral hole 1521 having a width larger than the diameter of the fitting pin 131 of the uppermost lock mechanism in the horizontal direction of the wall surface of the cylindrical body 161 and the diameter of the fitting pin 131 provided upward connected to the lateral hole It is configured with a vertical hole 1522 for receiving.

The handrail body 150a is slidably inserted into the cylindrical support body 110 of the ladder basic member 101 on the uppermost stage of the ladder body 102 in the direction of the cylinder axis. It has a retracted state and a slidably extended extended use state.
In FIG. 7, a portion of the portion housed inside the ladder body 102 is indicated by a dotted line. The insertion hole 152a itself is housed inside the uppermost ladder basic unit 101 and is not visible from the outside and should be drawn with a dotted line, but is drawn with a solid line for easy understanding. In addition, the insertion pin 131 of the ladder basic unit 101 on the uppermost stage is also inside the lock mechanism 130-1 for the handrail body, but is drawn in solid lines for easy understanding. Only the frame of the lock mechanism 130-1 for the handrail body is simply drawn.
Although not shown in FIG. 7A, similar to FIGS. 2 and 3, the insertion pin 131 is biased by a biasing elastic body 132, and in the state of FIG. 150 is accommodated without protruding against the wall surface of the cylindrical body 151 of the cylindrical body 150, but when facing the insertion hole 152a, the insertion pin 131 protrudes due to the biasing force (backward direction in the drawing) and enters the insertion hole 152a. , is the same as in FIG.
In the state of FIG. 7(a), the handhold member 153 of the handrail member 150 is parallel to the ladder body 102 (front side in the drawing).

As the change from FIG. 7(a) to FIG. 7(b) shows, each of the handrail bodies 150a can be raised independently. While ascending, the fitting pin 131 abuts against the cylindrical body 151 of the handrail body 150a and remains biased.
As shown in FIG. 7(b), when the handrail body 150a rises to a predetermined position where the insertion hole 152 of the handrail body 150a is provided, the insertion pin 131 is pushed out into the insertion hole 152a and interlocked. The mechanism is such that the operation lever 141 is slid outward to be locked.

Here, the insertion hole 152 has a so-called L shape, and the horizontal hole 1521 is wide, so that the insertion pin 131-2 can be reliably caught in the horizontal hole 1521 even if there is some play. ing. In other words, if the insertion hole is circular, inserting a circular pin of approximately the same diameter into the circular hole of approximately the same diameter may cause friction between the two, and the insertion pin 131 may not be able to protrude well if there is any play. However, in the configuration of the second embodiment, the width of the horizontal hole 1521 is large, so that the insertion pin 131 can be reliably caught in the horizontal hole 1521 .
FIGS. 7(a) to 7(b) illustrate the locking operation when the insertion hole 152a is so-called L-shaped.
When the handrail body 150a slides upward, the insertion pin 131 of the lock mechanism 130-1 faces the wide horizontal hole 1521, and the biasing elastic body 132 pushes the insertion pin 131 into the wide horizontal hole 1521. to fit.

Next, as shown in FIGS. 7(b) to 7(c), the operator rotates the handrail body 150a. In this example, the insertion pin 131 itself does not move, but the handrail body 150a rotates outward along the lateral hole 1521 of the L-shaped insertion hole 152a, that is, parallel to the ladder body 102. The handhold body 153 rotates to the front side of the ladder body 102 .
The operator turns the handrail body 150 until the insertion pin 131 reaches the other end of the horizontal hole 1521 without stopping the rotation. In this example, it is rotated by about 90 degrees. In addition, since the handhold member 153 is provided, the operator can easily recognize the rotation state of the handrail member 150a.
Next, as shown in FIG. 7(c), when the handrail body 150a is rotated and the insertion pin 131 reaches the other end of the horizontal hole 1521, the other end of the horizontal hole 1521 is followed upward by a vertical hole 1522. there is

FIG. 8(a) shows the operation after FIG. 7(c). FIG. 8(a) and FIG. 7(c) are in the same state.
Next, as shown in FIG. 8(b), the handrail body 150 moves downward by the length of the vertical hole 1522 by its own weight or by the operator's assistance. In other words, the insertion pin 131 itself does not move, but the handrail body 150 moves downward, that is, the handrail body 150 a moves along the vertical hole 1522 until the insertion pin 131 reaches the upper end of the vertical hole 1522 .
In the state shown in FIG. 8(b), the handrail body 150 is stabilized in this state by its own weight, and unless the operator lifts it by hand, it cannot slide vertically or rotate horizontally any more. A stable locked state is reached.
In addition, when the handrail body 150a is in the extended state, that is, in the state shown in FIG. become a component.

Next, the operation of unlocking the handrail body 150a will be described.
Basically, the flow is reverse to that of FIGS. 7 and 8. FIG.
9 and 10 are diagrams simply showing the relationship and movement between the handrail body 150 and the insertion pin 131 of the uppermost ladder basic unit 101 during retraction.
As shown in FIG. 9(a), the handrail body 150a is moved upward. At this time, the insertion pin 131 remains protruding inside, but the handrail body 150a can be moved upward along the vertical hole 1522 of the insertion hole 152, and the operator can move the insertion pin 131 to the lower end of the vertical hole 1521. The handrail body 150a is pulled up.
Next, as shown in FIGS. 9A and 9B, the handrail body 150 is rotated inward (to the left in the drawing) until the insertion pin 131 reaches the end of the horizontal hole 1521. Then, as shown in FIGS. As a guideline, the handhold member 153 is rotated inward until it becomes parallel to the horizontal beam 120 (not shown) (forward in the figure).

FIG. 10(a) shows the state after the leftward rotation in FIG. 9(b). In other words, the handhold member 153 is parallel to the horizontal rail 120 (not shown) (frontward direction in the drawing).
Here, the lock release mechanism 140-1 is operated to pull back the insertion pin 131 and pull it out from the insertion hole 152a.
The unlocking mechanism 140-1 operates on the same principle as explained in the shortening of the ladder basic unit 101 of each run shown in FIG. In other words, the mechanism and operation itself for releasing the locked state of the lock mechanism 130 and allowing the handrail body 150a to slide may be the same as those shown in FIG. Description is omitted here.
Similar to FIG. 4(c), when the wire is pulled from the outside, the interlocking insertion pin 131 moves toward the center (right side in the figure). When the fitting pin 131 is removed from the fitting hole 152a, the locked state of the locking mechanism 130 is released.
Ultimately, as shown in FIG. 10(b), the handrail body 150 is slid and housed in the cylindrical support body 110 of the ladder base member 101 on the uppermost stage.

Example 3 is an example in which a projecting body is applied to a telescoping ladder with a telescoping handrail.
Hereinafter, the back side of the ascending/descending surface of the extendable ladder with extendable handrail 100b (the side facing the wall surface of the work site) is simply referred to as the back side.

FIG. 11 is a diagram showing a telescopic ladder 100b with a telescopic handrail according to the third embodiment.
In the telescopic ladder with telescopic handrail 100b according to the third embodiment, the ladder body 102 and the handrail body 150 may be the same as those in the first and second embodiments.
FIG. 11(a) is a diagram of the extended state, in which the ladder body 102 is deployed to the extended state and the handrail body 150 is also extended. 1 of the first embodiment, the display surface is on the front side, but in FIG. 11(a), the display surface is on the back side.

The telescoping ladder with telescoping handrail 100b according to the third embodiment includes a plurality of projecting bodies 160 each having a predetermined length. This projecting body 160 secures a distance between the ladder body 102 and the wall surface of the work site. A worker ascends and descends while stepping on the horizontal rail 120, but it is difficult to ascend and descend unless a distance is secured between the horizontal rail 120 and the wall surface of the work site. Therefore, the distance is ensured by attaching a plurality of projection bodies 160 having a predetermined length.

Here, the projecting member attachment portion for attaching the projecting member 160 may be provided on a part of the rear surface side of the cylindrical strut body 110, or may be provided on a part of the rear surface side of the horizontal beam.
In the example of FIG. 11, a projection body mounting portion (not shown) is provided on a part of the horizontal beam 120 . A pair of right and left projecting member mounting portions (not shown) are provided on the rear surface of the horizontal beam 120 . Although the number of protrusions is not limited, in this example, the protrusions are provided at three positions, ie, the upper side, the center side, and the lower side. As shown in FIG. 11, projecting bodies 160 are attached to these projecting body mounting portions (not shown). In this example, a pair of left and right upper protrusions 160UR and 160UL, a pair of left and right middle protrusions 160MR and 160ML, and a pair of left and right lower protrusions 160LR and 160LL are provided.

In the example of FIG. 12, a part of the cylindrical strut body 110 is provided with a projection body mounting portion (not shown). A pair of right and left projecting member attachment portions (not shown) are provided on the rear surface of the cylindrical support member 110 . Similarly, the number of protrusions is not limited, but in this example, they are provided at three locations, the upper side, the center side, and the lower side. As shown in FIG. 12, projecting bodies 160 are attached to these projecting body mounting portions (not shown). In this example, a pair of left and right upper protrusions 160UR and 160UL, a pair of left and right middle protrusions 160MR and 160ML, and a pair of left and right lower protrusions 160LR and 160LL are provided.

Here, the mounting structure of the projection body 160 to the projection body mounting portion is not limited.
For example, there is a threaded structure. For example, a female screw is provided on the projecting member mounting portion and a male screw is provided on the base portion of the projecting member 160, and both are screwed together to connect.
For example, there is a fitting structure. The diameter of the base of the projecting member 160 matches the hole diameter of the projecting member mounting portion, and the projecting member 160 is pushed in to fit and connect.
Other connection methods can also be applied as long as the projecting body 160 can be firmly attached.

Here, as an ingenuity, there is an ingenuity to adjust the length of the projecting body 160 depending on the mounting position. As described above, the projecting body 160 is a member that secures a distance between the wall surface of the work site and the telescopic ladder with telescopic handrail 100b. Instead of facing upright, it is better to lean against the wall of the work site at a slight angle so that the installation state is stable.

FIG. 13 is a diagram showing a state in which the extendable ladder with extendable handrail 100b is leaned against the wall surface of the work site. As shown in FIG. 13, the length of the projecting body 160 increases as the mounting location goes downward. In FIGS. 11 and 12, the line of the assumed working wall surface is indicated by a dotted line, and the length of each projecting body 160 is adjusted so as to match the assumed working wall surface. If you connect the tip of the wall, it overlaps with the line of the assumed work wall surface.
In FIG. 13, the upright work wall surface corresponds to the assumed work wall surface in FIGS. Therefore, the telescoping ladder with telescoping handrail 100b is leaned at a predetermined angle, and the projecting body 160 comes into contact with the working wall surface in this state, so that the installation state of the telescoping ladder with telescoping handrail 100b is easily stabilized.

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

The extendable ladder of the present invention can be widely applied as a ladder. It can be widely applied as a ladder used in work places such as manholes, underground sites, and a ladder for escape from train cars.

Reference Signs List 100 Ladder 101 Ladder Basic Member 102 Ladder Body 110 Cylindrical Strut Body 120 Crosspiece 121 Fixed Crosspiece 130, 130-1 Lock Mechanism 131 Insertion Pin 132 Biasing Elastic Body 133 Insertion Hole 140, 140-1 Unlock Mechanism 141 Operation Lever 150 Handrail body 151 Cylindrical body 152 Fitting hole 153 Handhold body 154 Reference mark 160 Projection body

Claims (10)

A basic unit is a ladder basic member comprising a pair of cylindrical struts arranged in parallel with each other at a predetermined interval and a horizontal bar provided between the tubular struts, and the ladder basic members are connected to each other as a basic unit. Cylindrical struts are sequentially connected in a nested manner in the direction of the cylinder axis so as to be slidable, and there is a shortened storage state in which the ladder basic member is slidably stored, and an extended usage state in which the ladder basic member is slidably extended. a telescoping ladder body having a
Either one of the left and the right is provided with only one cylindrical body, or there are two cylindrical bodies on the left and right, but the left and right are independent. a retractable handrail body that is slidably connected to the cylinder axial direction in a nested state and has a retracted retracted state that is slidably retracted and an extended use state that is slidably extended;
a lock mechanism for temporarily fixing the ladder base members of the current stage and the lower stage in a locked state when the ladder base members of the current stage and the lower stage slide to each other or the handrail body and the ladder base member slide into the extended use state;
An unlocking mechanism that releases the locked state of the lock mechanism when operated from the outside, and puts the ladder basic members of the current step and the lower step in a slidable unlocked state or the handrail body and the ladder basic member. prepared,
The lock mechanism comprises a biasing elastic body incorporated in the ladder base member of each rung, an insertion pin biased by the biasing elastic body and protruding, and the cylindrical strut body or the cylinder of the handrail body. a structure in which an insertion hole is provided in a shaped body, and the insertion pin is fitted into the insertion hole;
In the locking mechanism for the handrail body and the ladder base member on the uppermost step, the handrail body is vertically slidable and horizontally slidable with respect to the cylindrical support member of the ladder base member on the uppermost step. A telescoping ladder with a telescoping handrail, characterized in that it has a structure capable of rotating freely. 2. A telescopic handrail according to claim 1, wherein said locking mechanism for said handrail body and said ladder base member on the uppermost step is provided with a plurality of said insertion holes of said handrail body horizontally. extension ladder. In the lock mechanism for the handrail body and the ladder base member on the uppermost step, a plurality of the insertion holes are provided in the handrail body, and the heights of the respective insertion holes are different. The telescoping ladder with telescoping handrail according to claim 1, characterized in that there is a In the lock mechanism between the handrail body and the ladder base member on the uppermost step, a plurality of the insertion holes are provided in the handrail body, and the horizontal rotation angle and the height are different at each hole. The telescoping ladder with telescoping handrails according to claim 1, characterized in that they are different. In the locking mechanism of the handrail body, the insertion hole is provided with a horizontal hole having a width larger than the diameter of the insertion pin of the uppermost lock mechanism in the horizontal direction of the wall surface of the cylindrical body. Item 1. A telescopic ladder with a telescopic handrail according to item 1. 3. The lock mechanism of the handrail body, wherein the insertion hole comprises the horizontal hole and a vertical hole having a width for receiving the diameter of the insertion pin provided upward from the horizontal hole. 5. The telescoping ladder with telescoping handrails according to 5. A part of the cylindrical body of the handrail body is provided with a handhold standing on a wall surface of the cylindrical body, and gripping the handrail allows the handrail to slide and extend and move horizontally. 7. The telescoping ladder with telescoping handrail according to claim 1, characterized in that the turning movement in the direction is operable. In the locking mechanism of each stage other than the uppermost stage, the biasing force elastic body and the insertion pin are provided in the horizontal beam, and the insertion hole is formed in the outer wall surface of the cylindrical support member of the ladder basic member. When the insertion hole comes to a position facing the insertion pin by sliding the ladder base member in the vertical direction, the insertion pin moves from the horizontal beam to the insertion hole of the cylindrical strut body. The locked state is achieved by fitting into the lock release mechanism, and the unlocked state is achieved by extracting the insertion pin from the insertion hole by the unlocking mechanism,
The lock mechanism between the handrail body and the uppermost ladder base member is such that the biasing force elastic body and the insertion pin are provided between the inner wall surface of the cylindrical support body and the outer wall surface of the handrail body. The fitting hole is formed in the outer wall surface of the handrail body, and the fitting hole is brought to a position facing the fitting pin by sliding in the vertical direction and rotating the handrail body. Then, the locking state is achieved by inserting the insertion pin into the insertion hole, and the unlocking state is achieved by extracting the insertion pin from the insertion state of the handrail body into the insertion hole by the unlocking mechanism. 8. The telescoping ladder with telescoping handrail according to any one of claims 1 to 7, characterized in that it has a structure of Equipped with multiple protruding bodies,
In one or more of the cylindrical struts or cross beams of the ladder body, projecting body mounting portions are provided for mounting the projecting bodies on the side of the work site that is opposite to the lifting surface of the user. prepared,
9. The telescopic ladder with telescopic handrails according to claim 1, wherein said projecting body can be attached to said tubular strut body or said cross beam of said ladder body in said extended state. 10. The telescopic handrail with extendable handrail according to claim 9, wherein the length of each of the projecting bodies is adjusted according to the mounting position of each of the projecting bodies on the ladder body. ladder.

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