JP2000054616A - Telescopic body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a telescopic ladder and stepladder which can be pulled up from a high stage. SOLUTION: A triple stage telescopic unit is equipped with a pair of longitudinal pipes 22, 26, 30 having different diameters and lateral crosspieces 24, 28, 32 provided among the tips of the longitudinal pipes. A lock mechanism 52 with unlocking function is provided in the lateral cross piece 28 of a middle stage unit, and energized in a lock direction by a coil spring and operated in an unlock direction by a lever. The pipe 30 in the top stage unit has an engaging hole 60 where a lock pin engages when the pipe 30 is stretched. The pipe 30 is provided with the second engaging hole 48 for engaging with a fixing pin 36 thinner than the lock pin which enters the longitudinal pipe when the top stage lateral crosspiece is stretched upward from a mutual contacting state of the crosspieces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a telescopic body such as a telescopic ladder or a stepladder.

[0002]

2. Description of the Related Art Conventionally, as a telescopic stepladder, for example, a pair of telescopic stepladder members in which the tops are pivotally connected to each other is known. This stepladder is composed of a plurality of units, each unit having a crosspiece attached to the tip of a pair of pipes spaced apart from each other. The pair of pipes of each unit are slidably connected and have different diameters. A lock mechanism with a release function for locking the pipes in an extended state is provided in the horizontal rail.

In this telescopic stepladder, when each horizontal rail is contracted so as to contact each other, the horizontal rail of the unit one level higher than the lowest level is lifted, and the release function of the lowermost unit in the horizontal rail is achieved. A lock mechanism locks the pipe of the unit one stage above the lowest stage. When the horizontal rail two steps above the lowermost stage is lifted, the lock mechanism with a release function in the horizontal rail of the unit one level higher locks the pipes of the unit one level higher and two levels higher than the lowermost level. Hereinafter, similarly, the stepladder is extended by being pulled up sequentially from the lower unit.

[0004]

However, in the telescopic stepladder, as described above, it is a rule that the units are pulled up in order from the lower side. For example, when the unit in the upper stage is pulled up, this unit is pulled up. An intermediate stopper must be installed between the crosspieces to prevent the mounted unit from lowering.

An object of the present invention is to provide a telescopic body such as a ladder or a stepladder which can be pulled up from the upper stage without using such an intermediate stopper.

[0006]

In order to solve the above-mentioned problems, the present invention has a plurality of telescopic units. Each telescopic unit has a pair of vertical pipes arranged in parallel at an interval, and a horizontal rail provided substantially vertically between the vertical pipes between the end portions of the vertical pipes. Each vertical pipe has a different diameter for each telescopic unit, and the vertical pipes are inserted in order such that the largest diameter is located at the bottom and the smallest diameter is located at the top. In the above horizontal rail of the unit other than the telescopic unit at the top and bottom,
A lock mechanism with a release function is provided. Each lock mechanism has a lock pin pressed by a resilient means toward the corresponding vertical pipe, and a lock lever for retracting the lock pin into the horizontal rail when in the horizontal rail. The first and second vertical pipes of the telescopic unit other than the lowermost row and the uppermost row are engaged with the lock pins of the lock mechanism of the horizontal rail lower than these when they are extended.
Has an engagement hole. When the horizontal pipes are extended upward from the state where the horizontal rails are in contact with each other, the vertical pipes of the telescopic unit other than the lowermost row and the one-level above the lower row,
A second engagement hole is formed to engage with a fixed pin having a smaller diameter than the lock pin, which has entered through the lowermost vertical pipe.

According to the present invention, when the unit is lifted up from the lower unit in the same manner as the conventional one, the first engagement hole formed in the pipe of the unit pulled up becomes the unit one step lower than this. Engages and locks the lock of the lock mechanism with release function in the horizontal rail. Hereinafter, similarly, each unit is sequentially pulled up from the lower side and locked. When the lock lever of the lowermost lock mechanism is pushed into the horizontal rail, the lock pin is retracted into the horizontal rail and the lock is released. As a result, the unit above the unit provided with the operated lock mechanism is lowered, and at this time, the lock lever of the lock mechanism of the unit above is pushed into the horizontal rail, and the lock lever of the unit becomes The lock on the next unit is released. Hereinafter, each unit descends in the same manner.

Further, when all the units are contracted and the telescopic units other than the lowermost stage and one stage higher than this are raised, the second engaging holes formed in the vertical pipe of this telescopic unit are inserted. The fixing pin is engaged to prevent the extension unit from descending. Therefore, it can be lifted without providing an intermediate stopper. Since the second engagement hole has a smaller diameter than the first engagement hole, it is difficult for the second engagement hole to be engaged with the lock pin of the lock mechanism during lifting. Absent.

The fixing pin can be provided in the lowermost horizontal rail. In this case, the first engagement hole of the vertical pipe of the unit one stage higher than the lowermost stage may be formed to have a diameter capable of engaging with the fixing pin.

[0010] In the case of such a structure, the lowermost stage is one unit.
The fixing pin can be used in common with the case where the unit on the step is pulled up and fixed and the case where another unit is pulled up from the upper side and fixed.

Further, the fixing pin can be inserted from outside the lowermost pipe. In this case, since it is not necessary to provide a fixing pin in the lowermost horizontal rail, the configuration can be simplified.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 5, a telescopic stepladder according to an embodiment of the present invention comprises a pair of telescopic members, for example, telescopic stepladder members 10, 10 having pivots 12 and 12 connected to each other.
Pivotally connected by a step 14
Is attached.

The stepladder member 10 has a plurality of, for example, three, lower, middle, and uppermost units 16, 18, and 20. The unit 16 has a pair of vertical pipes 22, 22 spaced apart and parallel to each other, and has a crosspiece 24 arranged on the upper part thereof, which is arranged substantially perpendicular to them. That is, it has a substantially inverted U-shape. The unit 18 also has a pair of vertical pipes 26, 26 and a horizontal rail 28. The unit 20 also has a pair of vertical pipes 30, 3
0 and the horizontal rail 32.

The vertical pipes 22, 2 of the lowermost unit 16
2, the vertical pipes 26, 26 of the intermediate unit 18 are slidably inserted therein. Inside the vertical pipes 26, 26, the vertical pipes 3 of the uppermost unit 20 are slidably inserted.
0 and 30 are inserted. Of course, the bottom vertical pipe 2
The diameters of the pipes 2 and 22 are also large, and the pipes 30 and 30 at the top
The diameter of the intermediate stage pipes 26, 26 is
It is an intermediate diameter between these.

The vertical pipes 22, 2 of the lowermost unit 16
At the lower end of 2, side fall prevention feet 32, 32 are attached, and further, a horizontal rail 34 is attached across the lower ends of the vertical pipes 22, 22.

Further, the vertical pipe 30 of the uppermost unit,
Pipes 36 and 36 are fixed to 30, and the above-described pivot 12 is provided at a distal end thereof.

Each of the horizontal rails 24, 28 and 32 has an open bottom, and a fixing pin, for example, an L-shaped lock lever 3 is provided near the vertical pipe 22 in the horizontal rail 24 as shown in FIG.
6, 36 are mounted facing the vertical pipes 22,22. These L-shaped lock levers 36, 36 are
End walls 24a, 24a at the boundary with the vertical pipes 22, 22 and walls 24b, 24b provided near the end walls 24a, 24b are provided so as to be able to advance and retreat along the length direction thereof.

Flanges 38, 38 are formed on the lock levers 36, 36 so as to contact the end walls 24a, 24a. Elastic means are provided around the lock levers 36, 36 between the flanges 38, 38 and the wall portions 24a, 24a.
For example, coil springs 40, 40 are attached. The coil springs 40, 40 urge the lock levers 36, 36 toward the pipes 22, 22, respectively, and the ends thereof enter the pipes 22, 22 through holes 41, 41 formed in the pipes 22, 22, respectively. I have.

These lock levers 36, 36 have a rear portion 36.
a, 36a are bent at a right angle,
When the lock levers 36, 36 are retracted against the urging force of the coil springs 40, 40a, the lock levers 36, 36 are engaged with the grooves 42, 42 formed in the side wall of the horizontal rail 24. From the pipes 22 and 22 are maintained.

As shown in FIG. 1, each cross rail 24, 28, 3
2 are in contact with each other, that is, in a state where the stepladder member 10 is contracted, the holes 26 are formed in the pipes 26, 26, 30, 30 so that the tips of the lock levers 36, 36 are engaged.
Holes 44, 44, 46, 46 are formed so as to coincide with 1, 41. In this state, it is impossible to raise any of the cross rails 32 and 28. That is, the stepladder is prevented from growing when it is unnecessary.

In this state, the lock levers 36, 3
6 is retracted and engaged with the grooves 42, 42, the horizontal rails 28, 32 can be pulled upward. Therefore, FIG.
As shown in the figure, when the uppermost horizontal rail 32 is pulled upward by a predetermined length, the lower part of the pipes 30, 30 is provided with a second engaging member so as to coincide with the holes 41, 41, 44, 44. Holes 48, 48 are formed. Lock levers 36, 36
When the rear portions 36a, 36a are removed from the engagement grooves 42, 42,
The lock levers 36, 36 are engaged with the engagement holes 48, 48, 44, 44, 41, 41 which are mutually matched by the urging forces of the springs 40, 40, and only the uppermost unit 20 is pulled up. can do. In this state, the state where only the uppermost unit 20 is extended can be maintained without using any kind of intermediate stopper.
To release this state, the lock levers 36, 36
May be retracted and engaged with the engagement grooves 42, 42.

Further, in a state where the horizontal rails 24, 28, 32 overlap each other, when the horizontal rails 28, 32 are pulled up as shown in FIG. 3, the pipes 26, 26, 30, 30 rise. Then, in a state where the pipes 26, 26 are pulled up by a predetermined height, the pipes 26, 26 are aligned with the holes 41, 41.
The second engagement holes 50, 50 are formed below the bottom. By engaging the lock levers 36, 36 with these matching engagement holes 41, 41, 50, 50, the uppermost unit and the middle unit 18, 20 can be pulled up. In this state, a member such as an intermediate stopper for preventing the units 18 and 20 from lowering is unnecessary. To release this state, the lock levers 36, 36 may be retracted and engaged with the engagement grooves 42, 42.

As shown in detail in FIG. 4, a lock pin 5 forming a part of a lock mechanism having a release function is provided in the horizontal rail 28.
1, 51 are attached. This lock pin 51,
51 has a larger diameter than the holes 41, 44, 46, 48 described above. Lock pins 51, 51 are provided near the pipes 26, 26 so as to face the pipes 26, 26 and move forward and backward along the length direction thereof. Specifically, end walls 28a, 28a and a wall portion 28 formed on the opposite side to the pipes 26, 26 with the end walls 28a, 28a interposed therebetween.
The lock pins 51 and 51 are supported by b and 28b.

The lock pins 51, 51 are formed with flanges 52, 52 at positions where they contact the end walls 28a, 28a, and are located between the flanges 52, 52 and the walls 24b, 24b. Elastic means around the lock pins 51, 51,
For example, coil springs 54, 54 are attached. The coil springs 54 also apply an urging force for urging the lock pins 51, 51 toward the pipes 26, 26.
51. In the pipes 26, 26, holes 56 of a size through which the tips of the lock pins 51, 51 can pass,
The lock pins 51, 51 can enter the pipes 26, 26 through the holes 56, 56.

The rear portions 51a, 51 of the lock pins 51, 51
One end of the lever 58 is in contact with a. The levers 58, 58 are rotatably supported halfway between the side walls of the horizontal rail 28. As shown in FIG.
When the lock pins 51, 51 enter the pipe 22, the other ends of the levers 58, 58 project below the bottom surface of the horizontal rail 28. On the other hand, when the other ends of the levers 58, 58 are made to enter the cross rail 28 by some force, the levers 58, 58 rotate, and the lock pins 51, 51
The rear portions 51a, 51a are retracted as shown in FIG. 4B, and the lock pins 51, 51 are pulled out of the holes 56, 56.

As shown in FIG. 1, below the lower ends of the pipes 30, 30, ie, below the second engagement holes 48, 48,
First engagement holes 60, 60 larger than lock pins 51, 51, that is, larger than second engagement holes 48, 48.
Are formed.

Therefore, as shown in FIG.
When the horizontal rail 32 is lifted in a state in which is lifted, the pipes 30, 30 are raised. Eventually, the second engagement holes 48, 48 reach the positions of the lock levers 51, 51, but the second engagement holes 48, 48
Since it is smaller than 51, the lock pins 51, 51 are not engaged with the second engagement holes 48, 48, and the ascent of the pipes 30, 30 continues.

When the first engagement holes 60 reach the positions of the lock pins 51, 51, the lock pins 51, 51 are inserted into the first engagement holes 60, as shown in FIG. ,
60, and the unit 20 is in a stretched state. At this time, the levers 58, 58 are drawn downward from the bottom of the horizontal rail 28.

Therefore, the lock levers 36, 36 are
When it is pulled out from 0, 50, the unit 18 descends and the lever 5
8 and 58 come into contact with the upper surface of the horizontal rail 24 and enter the inside of the horizontal rail 28. As a result, the lock pins 51, 51 are retracted, come out of the first engagement holes 60, 60, and
Is lowered, and all the units 16, 18, and 20 are in an expanded and contracted state.

As described above, according to the stepladder, the intermediate unit 18 can be stretched, and then the upper unit 20 can be stretched. In addition to this, only the uppermost unit 20 can be stretched. It is not necessary to provide a member such as an intermediate stopper to maintain the state.

In the above-described embodiment, when the unit 18 is pulled up, the lock levers 36, 3 engaged with the unit 18 are engaged.
When only the upper unit 20 was pulled up using the 6, it was fixed, but without using the lock levers 36, 36, each hole corresponding to the holes 41, 41, 44, 44, 46, 46 was used. To the pipes 22, 22, 2 on the opposite side of the horizontal rail 24.
6, 26, 30, 30 and pins engaging with them may be inserted through these holes.

Although the present invention is applied to the telescopic stepladder, it is also possible to use only the telescopic stepladder member 10 and use it as a ladder.

In the above embodiment, three units 16, 18, and 20 are used. However, the present invention is not limited to this, and more units can be used. In this case, when each unit is lifted from above,
The second engagement hole may be formed so that the second engagement hole formed in the pipe of the unit pulled up to the position corresponding to the lock lever 36 engages with the lock lever 36.

[0034]

As described above, according to the present invention, a telescopic body such as a stepladder or a ladder that can be pulled up from the upper stage without using an intermediate stopper and can be pulled up sequentially from the bottom. Can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part in a state where each unit of a telescopic stepladder according to an embodiment of the present invention is contracted.

FIG. 2 is a longitudinal sectional view of a main part of the stepladder of FIG. 1 in a state where a top unit is pulled up.

FIG. 3 is a longitudinal sectional view of a main part in a state where an uppermost step and a second step of the stepladder of FIG. 1 are pulled up.

4 is a longitudinal sectional view of a main part when the uppermost stage is pulled up from the state of FIG.

FIG. 5 is a perspective view showing the entire stepladder of FIG. 1;

[Explanation of symbols]

 Reference Signs List 10 stepladder member 16 18 20 stepladder unit 22 26 30 vertical pipe 24 28 32 horizontal rail 51 lock pin (lock mechanism with automatic release function) 54 coil spring (lock mechanism with automatic release function) 58 lever (lock mechanism with automatic release function) 48 Second engagement hole 60 First engagement hole

Claims (3)

[Claims] 1. A plurality of telescopic units, each telescopic unit being provided between a pair of vertical pipes arranged in parallel at an interval and between the distal ends of the vertical pipes, substantially vertically to the vertical pipes. Each vertical pipe has a different diameter for each telescopic unit, with the largest diameter at the bottom and the smallest diameter at the top. The vertical pipes are inserted through each other, and a lock mechanism with a release function is provided in the horizontal rail of the unit other than the uppermost and lowermost telescopic units, and each of the lock mechanisms is provided with an elastic means on the corresponding vertical pipe side. And a lever for retracting the lock pin into the horizontal rail when in the horizontal rail, the vertical pipes of the telescopic unit other than the lowermost and one-step above the lowermost row, When is extended, And a first engagement hole with which a lock pin of a lock mechanism of a horizontal rail lower than the first and second horizontal rails is engaged. When the horizontal rails are extended upward from the state where they are in contact with each other, the second engagement member engages with a fixed pin having a smaller diameter than the lock pin, which has entered through the lowermost vertical pipe. An elastic body in which a hole is formed. 2. The telescopic body according to claim 1, wherein the fixing pin is provided in a lowermost horizontal rail, and a first engaging hole of a vertical pipe of a unit one stage higher than the lowermost stage is provided. A telescopic body formed to have a diameter capable of engaging with the fixing pin. 3. The telescopic body according to claim 1, wherein the fixing pin is inserted from outside the lowermost pipe.