JP2564332Y2 - Ladder strut lower end stabilizer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ladder lower end stabilizer capable of placing a ladder in a stable state and safely performing work on the ladder.

[0002]

2. Description of the Related Art Conventionally, a ladder for climbing a high place to perform work or the like is, for example, one having a large number of steps installed between two long columns, or a ladder provided on the left and right. A common stepladder is formed by pivotally connecting pieces and placing the pieces on the ground in a substantially C shape. In addition, such a ladder is formed so that the lower ends of the struts can be extended and contracted so that it can be used even on a place with poor scaffolding, such as steps or uneven ground.

[0003] In such a telescopic ladder, since the mounting angle of the support on the ground is not always constant, the base under the support is devised so as to be able to rotate uniformly in all directions.

[0005] That is, as shown in FIG. 5, bearing bodies 18 are provided on the upper surface of a base 17 at regular intervals, a pivot 16 is erected between the bearing bodies 18, and vertically suspended at the lower end of the telescopic column 4. A pivot insertion hole is provided in the bracket 21 so that the pivot 16 is inserted. The base 17 not only pivots back and forth with respect to the telescopic column 4 about the pivot 16 but also includes a bracket 21.
Axis insertion hole is formed as a long hole, and Axis 16 itself is Axis 16
It is configured to be rotatable in the vertical direction so as to be able to cope with any movement of the column 1.

[0005]

However, since the pivot insertion hole into which the pivot is inserted is a long hole, the shaft itself rotates at right angles to the shaft and simultaneously moves up and down along the long hole. Therefore, the misalignment of the Axis becomes large between the front, rear, left and right columns, and the fluctuation of the length of the right and left columns due to the vertical movement of the Axis impairs the stability. There was a problem that it could not be done and danger occurred.

[0006]

According to the present invention, left and right brackets having a central portion bulging outward are vertically provided on the lower surface of a column, and a pipe is provided between internal concave portions formed by bulging portions of the left and right brackets. The left and right brackets are provided with a vertically elongated hole, the pipe is provided with a shaft insertion through hole in the peripheral wall, and the pivot installed between the left and right brackets is A ladder pillar lower end stabilizing device characterized in that it is inserted into the through hole and erected between bearing bodies erected on the upper surface of the base, and the base is connected to the lower end of the support so as to be able to rotate back and forth and left and right. Is provided.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on an embodiment shown in the accompanying drawings.

As shown in FIG. 1, the basic structure of the telescopic ladder A having the column lower end stabilizer according to the present invention is as follows.
Arrange the posts 1,1 on the left and right at a fixed interval.
A short stairway 2 is erected between the two to form a ladder piece A1. Then, as shown in FIG. 2, two ladder pieces A1, A
1 is pivotally connected to the upper end by a joint fitting 3 so as to be freely opened.

The column 1 is formed to have a substantially U-shaped cross section that opens inward, and a telescopic column 4 that opens outward is slid inside the column 1 into the internal space of the column 1. They are loosely fitted so that they can freely and face the opening directions facing each other.

Further, as shown in FIG.
Is slidable up and down, and a fixing device 6 provided at a connecting portion between the column 1 and the step 2 is used to move the column 1 from the telescopic column 4.
Is fixed in a state where only the required length is extracted, and the fixing device 6
Is operated by the operation unit 5.

That is, the rack 7 is provided on the side of the telescopic support 4.
And a rack shoe 9 that slides up and down via a spring 8 is attached to the support 1, and the telescopic support 4 is fixed to the support 1 by fitting the rack shoe 9 and the rack 7. In addition, the rack shoe 9 and the rack 7
An operation unit 5 for fitting and releasing the operation unit 5 is mounted, and the operation unit 5 is provided with an operation lock unit 10.

The extension and contraction operation of each column 1 is performed by raising the knob 11 of the fixing device 6 upward while holding the operation lock means 10.
Is released, the fitting between the rack shoe 9 and the rack 7 is released by adjusting the knob 11, and the operation of extracting the telescopic strut 4 can be performed freely. Further, after extracting the telescopic strut 4 by a necessary length, the knob 11 is returned to the original state and the operation lock means 10 is locked, so that the telescopic strut 4 can be fixed to the strut 1.

At the lower end of the telescopic strut 4, a strut lower end stabilizer 12 for supporting the ladder A on the ground or the like is provided.

The telescopic ladder A having the above structure is composed of a front and rear ladder piece A.
By extending and retracting the telescopic struts 4,4 from the struts 1,1 of 1, A1 and adjusting their lengths, as shown in FIG. It can be installed in a stable state.

In the above-described basic structure of the telescopic ladder A,
As described below, the present invention is characterized in that the column lower end stabilizer 12 has been improved to further increase stability.

That is, as a basic structure of the pillar lower end stabilizer 12, the central portion is bulged outward at the lower ends of the telescopic columns 4, 4 of the front and rear ladder pieces A1, A1 as shown in FIG. Left and right brackets 13 are vertically installed, and the lower ends of the brackets 13 are continuous to form an annular bracket.

The upper portion of the left and right brackets 13 is divided into left and right pieces, and projects vertically upward to form a mounting portion 13a,
The mounting portion 13a is fitted to the lower end of the telescopic strut 4 and each of the left and right pieces is fixed to the telescopic strut 4 with screws 13b.

A pivot 16 is inserted through a vertically long hole 19 provided in the bracket 13 in a longitudinal direction in a direction orthogonal to the internal concave portion 14 formed by the bulging portion of the bracket 13. The pivot shaft 16 is mounted on a bearing 18 which is provided substantially vertically at regular intervals on the upper surface of the base 17. Therefore, the base 17 is connected to the lower end of the column 1 via the bearing 18. , And is configured to be rotatable in all directions.

The base 17 is formed in the shape of a rectangular plate, and the back surface forms a non-slip portion 17a having an uneven shape. A pair of bearings 18 connected to the base 17 are arranged as shown in FIG. The bearing 18 has a hole 18a at the tip end thereof for mounting the pivot 16.

The pivot 16 passes through the hole 18a and
And both ends are screwed from the outside of the bearing body 18 respectively.
It is fixed to the bearing body 18 by 16a.

A pillar lower end stabilizer 12 having the above basic structure
, A cylindrical pipe 15 is rotatably interposed in the bracket 13.

That is, as shown in FIG.
A cylindrical pipe 15 is provided inside a concave portion 14 formed in the bulging portion of 13, and the pipe 15 is rotatably provided inside the concave portion 14, and further, the pipe 15 On the surrounding wall,
A shaft insertion hole 20 is provided, and the pipe 15 is configured to rotate up, down, left, and right with the movement of the pivot 16 in a state where the pivot 16 is inserted through the coaxial insertion hole 20.

That is, when the pivot 16 performs a vertical rotation along a vertically long hole 19 shown in FIG. 4 provided in the bracket 13, the pivot 16 rotates about the central axis of the cylindrical body of the pipe 15. Is performed so that the vertical movement caused by the indeterminate center axis as in the related art is prevented.

Also, in the pivoting operation in the front-rear direction, since the pivot 16 is held by the pipe 15, the pivot 16 is rotated at a fixed position of the vertically long hole 19 as shown in FIG. Will be

As described above, the support lower end stabilizer 12 of the present invention is provided.
According to this, in the rotation operation in all directions of front, rear, left and right, the vertical movement of the pivot 16 is prevented, and the length of the column 1 is always kept constant when it is placed on the ground, so that it is stepped or uneven. The work with the telescopic ladder can be done safely even in the place of the shape, and at the same time, the telescopic adjustment of the strut can be performed accurately.

[0026]

According to the present invention, the left and right brackets bulging outward at the center are erected on the lower surface of the support of the ladder, and a pipe is inserted between the inner concave portions formed by the bulging portions of the left and right brackets. The left and right brackets have a vertically long hole and the pipe has a shaft insertion hole in the peripheral wall.The pivot between the left and right brackets is inserted through the vertically long hole and the shaft. The present invention relates to a column lower end stabilizer of a ladder in which a base is connected to a lower end of a column so as to be able to rotate back and forth and left and right by penetrating a hole and extending between bearing bodies erected on the upper surface of the column. Since the pipe is provided in the left and right brackets and the pivot is provided by penetrating the shaft insertion hole provided in the pipe, the pivoting movement of the pivot in the front and back and left and right is stabilized, and the vertical movement of the pivot is prevented, The work on the ladder can be performed safely. Also,
The extension and contraction adjustment of the support can be performed more accurately.

[Brief description of the drawings]

FIG. 1 is an enlarged explanatory view of a main part of a telescopic ladder partially cut away.

FIG. 2 is an explanatory view of use of a telescopic ladder.

FIG. 3 is a cross-sectional view of a pillar lower end stabilizer of the ladder according to the present invention.

FIG. 4 is a sectional view taken along line II of FIG. 3;

FIG. 5 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Prop 13 Right and left bracket 14 Concave part 15 Pipe 16 Axis 17 Base 18 Bearing body 19 Vertical hole 20 Shaft insertion hole

Claims (1)

(57) [Scope of request for utility model registration] 1. A left and right bracket (13) having a central portion bulging outward at a lower surface of a support (1), and the left and right brackets (13) are provided.
Pipe between the internal recesses (14) formed by the bulges of
(15) is rotatably interposed, a vertically long hole (19) is formed in the left and right bracket (13), and a shaft insertion hole (20) is formed in the pipe (15) in the peripheral wall. , A pivot (16) installed between the left and right brackets (13) is inserted into the vertically elongated hole (19) and the shaft insertion hole (20), and a bearing body ( 18)
A lower end support for a ladder, wherein a base (17) is connected to a lower end of the support (1) so as to be able to rotate back and forth and left and right.