JPH1088949A - Telescopic stepladder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow various operations at high positions to be done easily and safely. SOLUTION: A pair of telescopic stepladder members 10 are pivotally connected together at their tops, each of the telescopic stepladder members 10 including a pair of side rails made of plural pipes slidably joined together and differing in diameter, a rung member attached to the tip of each of the pipes forming the pair of side rails 1, and a release-mechanism-equipped lock mechanism 14 which can lock the pipe of each side rail in an extended position. Therefore, even if working height varies, a step 10b is held at a predetermined height by expansion/contraction of the telescopic stepladder members 10 and can be firmly locked at that position by the release-mechanism-equipped lock mechanism 14, so that the operator can do various operations easily and safely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic stepladder that can be easily and safely performed when performing various kinds of work at a high place.

[0002]

2. Description of the Related Art A stepladder used for aerial work such as pruning or wall painting of a plant is generally provided with a pair of stepladders fitted together from both sides, and a top portion pivotally connected to each other. A step is formed at the pivotal connection. Further, each stepladder member is configured by connecting both side columns arranged at parallel intervals in the width direction by a plurality of horizontal beam members provided at intervals in the vertical direction.

[0003]

However, the stepladder described above still has the following problems to be solved. That is,
Since both side pillars are formed of a single long pipe and are an integral structure firmly connected by a plurality of cross members, the height cannot be adjusted. Therefore, for example, in order to prune portions of different heights of the plant, the operator must perform the operation in an unnatural posture or appearance, making the pruning operation dangerous. This was true for other high-altitude operations.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a telescopic stepladder that can easily and safely perform various high-place work.

[0005]

According to the present invention, there is provided a semiconductor device comprising:
In the telescopic stepladder described above, the pair of telescopic stepladder members are pivotally connected to each other, and each telescopic stepladder is slidably connected to a pair of slidably connected pipes having gradually different diameters. And a horizontal beam member attached to the tip of each pipe of the pair of columns, and a lock mechanism with a release function that can lock the pipes in the both-side columns in an extended state.

According to a second aspect of the present invention, there is provided the telescopic stepladder according to the first aspect, wherein the lock mechanism with the release function is provided at both side ends of the horizontal rail member, and the horizontal rail member is attached. A pin which is urged by a spring and protrudes at the limit of ascending of the next pipe fitted into the original pipe, and which is inserted into a through hole of the original pipe and a hook hole of the next pipe;
A lever for removing the pin from the engaging hole against the urging force of the spring, and confirming that the pin is fitted in the engaging hole, or the pin is fitted in the engaging hole. And a visual recognition unit that allows the user to confirm that the user is not in the vehicle.

According to a third aspect of the present invention, there is provided the telescopic stepladder according to the second aspect, wherein the viewing portion comprises a window.
A mark member having a reddish surface color is provided at a rear portion of the pin, and the mark member can be seen from the window with the pin positioned at a set position. The telescopic stepladder according to claim 4 is the telescopic stepladder according to any one of claims 1 to 3, wherein a base is rotatably mounted to a lowermost portion of each of the columns of the telescopic stepladder. A release foot which can be selectively locked to the prevention foot, the fall prevention position in which the tip is directed outward of each of the columns, and the storage position in which the tip is directed toward the interior of each of the columns. Equipped with a foot lock mechanism with function.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. The overall configuration of the telescopic stepladder L according to one embodiment of the present invention will be described with reference to FIGS.

As shown in the figure, in this embodiment, the telescopic stepladder L is constructed by pivotally connecting the tops of a pair of telescopic stepladder members 10 by a pivot 10a. A step 10b is formed at the bottom. Each telescopic stepladder member 10 is a pair of columns 1 composed of a plurality of pipes having different diameters slidably connected to each other.
1, 12; a crosspiece member 13 attached to the tip of each pipe of the pair of columns 11, 12;
2 is provided with a lock mechanism 14 with a release function that can lock the pipes in an extended state.

The bottoms of the lower original pipes A1 and A2 constituting the columns 11 and 12 are provided at the bottoms thereof.
1. Foot 1 to prevent sideways rotation about the axis of A2
5 and 16 are attached. Further, between the column connecting cylinders 10c and 10d projecting below the step 10b, there is provided an expansion angle restricting tool 10e for restricting the expansion angle between the telescopic stepladder members 10.

Hereinafter, the structure of each part of the telescopic stepladder L having the above structure will be described in detail with reference to FIGS. Since the pair of telescopic stepladder members 10 has the same configuration, only the configuration of one telescopic stepladder member 10 will be described below. As shown in FIG. 1 to FIG.
1 (same for the support 12) is telescopic or telescopic,
A horizontal rail member 13 is erected between the ends of each of the pipes, which are slidably fitted with n aluminum pipes having gradually different diameters.

Next, referring to FIG. 4 to FIG.
3. The configurations of the lock mechanism 14 with the release function and the sideways prevention feet 15 and 16 will be described. For convenience of explanation, when each connected pipe functions as an outer pipe, the pipe is referred to as an original pipe A, and a pipe slidably mounted in the original pipe A is referred to as a next pipe B. As shown in FIGS. 4 and 5, as shown in FIG. 4, the next pipe B made of a pipe having an outer diameter substantially the same as the inner diameter of the original pipe A is attached to the original pipe A consisting of the pipes except the uppermost pipe. It is inserted.

As shown in FIGS. 4 and 5, the horizontal beam member 13 is made of a hard colored plastic material having sufficient strength, and has a plurality of vertical ribs spaced apart in the width direction on the lower surface of the horizontal flange 13a. It has a highly rigid box structure in which 13b to 13e are continuously provided. As shown in FIGS. 4 and 5, an original pipe mounting ring 17 is continuously provided on both sides of the horizontal rail member 13, and when an original pipe A having a predetermined outer diameter is fitted to the original pipe mounting ring 17. The arc-shaped stopper 18 provided on the inner peripheral surface of the original pipe mounting ring 17 is supported in contact with the upper end of the original pipe A. As shown in FIG. 4, the original pipe mounting ring 17 has a lock mechanism 14 having a release function described later.
A female screw hole 40 is provided on the side 180 ° opposite to the above, and a beam fixing bolt 41 is screwed into the female screw hole 40. Then, the crosspiece fixing bolt 41 is aligned with the through hole 42 provided on the upper part of the original pipe A. Therefore, by rotating the beam fixing bolt 41, the tip portion is
By moving the horizontal rail member 13 into the original pipe A.
Can be fixed firmly. Note that the connection and fixing of the original pipe mounting ring 17 to the original pipe A can be performed using an insertion fixing pin or an adhesive instead of the rail fixing bolt 41.

A through hole 1 is provided at the upper end of the mounted original pipe A.
9, the through hole 19 is formed with a hook hole 28 provided at the lower end of the next pipe B when the next pipe B is in the extended position, as shown in FIG. It is in the matching state. A metal pin 20 is disposed in the through hole 19 and the hook hole 28 so as to be able to come and go.
The retracting operation of 0 is performed by operating a lever 25 of the lock mechanism 14 having a release function described below.
As shown in FIGS. 4 and 5, a pin body 20b of the pin 20 is provided.
Is a guide hole 2 provided in the peripheral wall of the original pipe mounting ring 17.
The first pipe A and the next pipe B are slidably mounted in a guide hole 22 provided in a wall extending from the horizontal flange 13 a of the horizontal rail member 13.

The peripheral wall of the original pipe mounting ring 17 and the horizontal rail member 13
A spring receiver 30 is integrally fixed to the outer peripheral surface of the pin body 20b at a position between the horizontal flange 13a and a wall suspended from the horizontal flange 13a. Between the spring receiver 30 and the wall suspended from the horizontal flange 13a of the horizontal rail member 13, the pin 20 is attached to the original pipe A and the next pipe B while surrounding the pin body 20b. A biasing spring 23 is provided. At the rear of the pin 20, an enlarged diameter head is provided via a reduced diameter portion 20a,
A red paint is adhered to the enlarged diameter head, and a mark member 20c is formed.

An intermediate portion of a lever 25 is rotatably mounted on a pin shaft 26 at a position below the mark member 20c, and a pin 20 is provided in a bifurcated groove 24 provided at the tip of the lever 25. Is inserted. Therefore, when the lever 25 shown in FIG. 4 is rotated clockwise, the pin 20 retreats against the urging force of the spring 23, and the tip of the pin 20 separates from the through hole 19 and the engaging hole 28. Will be. When the clockwise rotational force on the lever 25 is released and the lever 25 is set in a free state, the urging force of the spring 23 causes the pin to move when the next pipe B is in the extended position as shown in FIG. 20 has a through hole 19 for the original pipe A and a hook hole 2 for the next pipe B
8 will pass through.

As shown in FIG. 4, a mark member 20c provided at the rear of the pin 20 is provided on the ceiling of the horizontal rail member 13.
There is provided a viewing window 29 which is an example of a visual recognition unit that can be seen from above. The diameter of the viewing window 29 is substantially the same as the diameter of the mark member 20c. When the pin 20 is retracted, the mark member 20c colored red can be seen from the viewing window 29, whereby the pin 20 projects. Workers can know that they are not.

When the pin 20 is projected and fitted into the hook hole 28, the red mark member 20c cannot be seen through the viewing window 29, and as a result, the lock of the pin 20 is indirectly visually recognized. I can do it.

As shown in FIG. 6, in this embodiment, the side-to-side preventing foot 15, which is rotatably attached to the lowermost part of each of the columns 11, 12 of each of the telescopic stepladder members 10,
16 has the following configuration. In addition, since the both sides fall prevention foot 15 and 16 are the same structure, the side fall prevention foot 15 is demonstrated. As shown in the figure, a base 31 formed of a cylindrical body having both ends opened and a front end 32 connected to the base 31 are provided.
A mounting support surface 34 having a large number of protrusions 33 is formed on the lower surface of the tip portion 32.

A base 31 made of a cylindrical body,
A vertically split slit is provided in the vertical direction on the side which is not continuously provided with the pair 2, and a pair of connection flanges 39 each having a through hole 38 are continuously provided on both end edges of the vertically split slit. I have. An annular groove 35 is provided at an intermediate position on the inner peripheral surface of the base 31 made of a cylindrical body.
A tapered annular projection 36 is provided on the outer peripheral surface of the lowermost original pipe A1 corresponding to 5.

Therefore, the base 31 of the side fall prevention foot 15
By inserting the lowermost original pipe A1 of the column 11 into the base 31 and fitting the annular projection 36 into the annular groove 35, and connecting the connecting flanges 39 using connecting bolts (not shown). , Side fall prevention foot 1
5 is the original pipe A at the bottom of the column 11 so that it can rotate 360 °.
1 can be attached. When the telescopic stepladder L is used, the tip 32 of the foot 15 can be rotated to a position where the tip 32 of the foot 15 is directed to the outside of the column 11, and when not in use, the tip 15 is prevented. The tip portion 32 of the foot 15 can rotate to the storage position where the tip portion 32 faces the inside of the column 11. And foot 15
In each position, foot lock mechanism 3 with release function
7 can be fixed. Therefore, when in use, the side-to-side prevention foot 15 can be extended out of the column 11 to effectively prevent the side-to-side fall of the telescopic stepladder L, and when not in use, the side-to-side prevention foot 15 can be turned inward. Thus, the transport and storage of the telescopic stepladder L can be easily performed. In addition, the foot lock mechanism 37 with the release function
Has substantially the same configuration as the lock mechanism 14 with the release function, as shown in FIG.

Next, the telescopic stepladder L having the above-described configuration is used.
How to use will be described. First, the telescopic stepladder member 10 forming a pair around the pivot 10a is rotated to open the leg. After releasing the foot lock mechanism 37 with the release function, the tip 32 of the lateral fall prevention foot 15, 16 is rotated to the fall prevention position facing the outside of the columns 11, 12, and then the foot lock mechanism 37 with the release function is again turned on. Activates the side fall prevention foot 1
5 is fixed.

Next, one of the telescopic stepladder members 10 of the telescopic stepladder L is extended by a predetermined length. At this time, first, when the next pipe B attached to the lower original pipe A1 is pulled out and extended, the pin 20 is urged by the spring 23 at a predetermined extension position, and is provided at the lower part of the next pipe B. And locks the movement of the next pipe B.
In this case, the mark member 20c cannot be visually recognized from the viewing window 29, and it can be seen that the next pipe B is securely locked and safe. On the other hand, the next pipe B
If the pin 20 is not fitted into the hook hole 28 even if the line is extended, the red mark member 20c can be seen from the viewing window 29, indicating that it is dangerous. Similarly, from the bottom 2
The third stage pipe is pulled out from the bottom as the next pipe B and extended, and the next pipe B is locked to the original pipe A by the lock mechanism 14 with a release function. Thereafter, with respect to the other pipes, one telescopic stepladder member 10 is extended to a desired length, and the next pipe B is locked by the lock mechanism 14 with the release function. Then, the other telescopic stepladder member 10
Is similarly extended by the same length, and is securely locked by the lock mechanism 14 with the release function. Thus, the telescopic stepladder L having the step 10b having a predetermined height is provided.
Can be assembled, and then the telescopic stepladder L can be carried to the work place to perform work at a high place.

Next, when the next pipe B is inserted into the original pipe A to shorten the entire length of the telescopic stepladder member 10, the operating portion 27 of the lever 25 is pushed to retract the pin 20, and the engaging hole 28 Then, the lock of the next pipe B is released. In this case, the mark member 2 is
0c can be visually recognized. As described above, in the present embodiment, even when the working height changes in a high place work such as a pruning operation of the planting tree, the step ladder 10b is moved to the predetermined height position by expanding and contracting the telescopic stepladder member 10. After that, it can be securely locked at the same position by the lock mechanism 14 with the release function, and the operator can easily and safely perform various operations.

As described above, the present invention has been described with reference to an embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and is described in the claims. It also includes other embodiments and modifications that can be considered within the scope of the matters described. For example, in the present embodiment, the pin 20 is detached from the hook hole 28 so that the pin 20 can be visually recognized from the viewing window 29. However, the position of the viewing window 29 is changed so that the pin 20 fits into the hook hole 28. You may be able to visually recognize what you are doing.

Although the viewing window 29 is provided on the ceiling of the horizontal rail member 13, it may be provided on the side surface, or may be provided on both sides in some cases. It is free to arrange a transparent resin, a glass plate, or the like in the part of the viewing window 29.

[0027]

In the telescopic stepladder according to the present invention, the tops of the pair of telescopic stepladder members are pivotally connected to each other, and the telescopic stepladder members are slidably connected. A pair of struts composed of a plurality of pipes having gradually different diameters, a cross beam member attached to the tip of each pipe of the pair of struts, and the pipes on both struts can be locked in an extended state. A lock mechanism with a release function. Therefore, for example, in a high place work such as pruning work, even if the work height changes, after the telescopic stepladder is expanded and contracted to set the step on the predetermined height position,
It can be securely locked at the same position by a lock mechanism with a release function, and the operator can easily and safely perform various operations.

In particular, in the telescopic stepladder according to the second aspect, the lock mechanism with the release function is provided at both end portions of the horizontal rail member, and is provided for the next pipe fitted into the original pipe to which the horizontal rail member is attached. The pin is pushed by the spring at the ascending limit and protrudes, and is inserted into the through hole of the original pipe and the engaging hole of the next pipe, a lever for releasing the pin from the engaging hole against the urging force of the spring, and the pin is engaged. It is provided with a visual recognition part that can confirm that it is fitted in the stop hole or that can confirm that the pin is not fitted in the catch hole. Therefore, the state of the pin for fixing the next pipe to the original pipe can be checked, and the worker can check the safety by looking at the visual recognition part, so that the safety of work can be further improved. Further, since the lock mechanism with the release function has a relatively simple structure, it can be manufactured at low cost.

[0029] In the telescopic stepladder according to the third aspect, the viewing portion is formed of a window, and a mark member having a red color is provided on the rear portion of the pin, and the pin is located at the set position. In this state, the mark member is made visible through the window, so that the operating state of the pin can be confirmed without fail.

In the telescopic stepladder according to the fourth aspect, the base of the anti-falling foot is rotatably attached to the lowermost portion of each of the columns of the telescopic stepladder, and when the telescopic stepladder is used, it falls down. The tip of the prevention foot is locked by the foot lock mechanism with release function at the fall prevention position where the tip of the prevention foot faces to the outside of each column, and when not in use, the tip of the side fall prevention foot is locked at the storage position where the tip of the side falls to the inside of each column . Therefore,
When in use, the anti-tilt foot can be placed outside the support column to effectively prevent the telescopic stepladder from falling over. The stepladder can be easily transported and stored.

[Brief description of the drawings]

FIG. 1 is a front view of a telescopic stepladder according to an embodiment of the present invention in a state where an open leg is used.

FIG. 2 is a side view of the same.

FIG. 3 is a front view in the closed leg non-use state.

FIG. 4 is an explanatory view showing the structure and operation of a lock mechanism with a release function.

FIG. 5 is a bottom view of the same.

FIG. 6 is an explanatory view of a mounting state of a side fall prevention foot.

[Explanation of symbols]

A Original pipe A1 Original pipe A2 Original pipe B Next pipe L Telescopic stepladder 10 Telescopic stepladder member 10a Axis 10b Stepping platform 10c Post connecting column 10d Post connecting column 10e Spreading angle restricting tool 11 Post 12 Post 13 Horizontal beam member 13a Horizontal flange 13b Vertical rib 13c Vertical rib 13d Vertical rib 13e Vertical rib 14 Lock mechanism with release function 15 Side fall prevention foot 16 Side fall prevention foot 17 Original pipe mounting ring 18 Stopper 19 Through hole 20 Pin 20a Reduced diameter portion 20b Pin body 20c Mark member DESCRIPTION OF SYMBOLS 21 Guide hole 22 Guide hole 23 Spring 24 Groove 25 Lever 26 Pin shaft 27 Operation part 28 Hook hole 29 Viewing window (viewing part) 30 Spring receiver 31 Base 32 Front part 33 Projection 34 Mounting support surface 35 Annular groove 36 Annular projection 37 Foot with release function Lock mechanism 38 Through hole 39 Connecting flange 40 Female screw hole 41 Crosspiece fixing bolt 42 Through hole

Claims (4)

[Claims] 1. A pair of telescopic stepladder members are pivotally connected to each other, and each telescopic stepladder member is a pair of slidably connected pipes having gradually different diameters. A strut, a crosspiece member attached to the tip of each pipe of the pair of struts, and a lock mechanism with a release function capable of locking the pipes on the both-side struts in an extended state. Telescopic stepladder. 2. The lock mechanism with a release function is provided at both side ends of the horizontal rail member, and is urged by a spring at a rising limit of a next pipe fitted into an original pipe to which the horizontal rail member is attached. A pin inserted into the through hole of the original pipe and the engaging hole of the next pipe, a lever for removing the pin from the engaging hole against the urging force of the spring, and the pin The telescopic stepladder according to claim 1, further comprising: a visual recognition portion that can confirm that the pin has been fitted into the hole or that can confirm that the pin has not been fitted into the engaging hole. 3. The visual recognition unit comprises a window, and a mark member having a red color on the surface is provided at a rear portion of the pin. When the pin is located at a set position, the mark is removed from the window. The telescopic stepladder according to claim 2, wherein the mark member is visible. 4. A side-fall prevention foot having a base rotatably mounted at the lowermost part of each of the columns of each of the telescopic stepladders,
A foot lock with a release function that can selectively lock the lateral fall prevention foot in a fall prevention position in which a tip portion faces outward of each of the columns and a storage position in which the tip portion faces inward of each of the columns. The telescopic stepladder according to any one of claims 1 to 3, further comprising a mechanism.