JP2589920B2 - Telescopic ladder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic ladder, and more particularly to a telescopic ladder used for pit work in a main rope replacement work of an elevator.

[0002]

FIG. 6 is a side view showing a conventional telescopic ladder. In FIG. 6, A is an elevator passage, 1 is an elevator floor provided on each floor, 2 is a landing door, 3 is a pit floor, 4 is a buffer, 5 is a counter fixed burr, and 6 is a buffer. A counter spacer placed on the top of the vessel 4 and supporting the counterweight 7; 8 is a weight piece 7a of the counterweight 7;
9 is a main rope, 10 is a telescopic ladder used for work in the pit, 11 is a pair of fixed-side supports having a shoe 12 at a lower end, which is hooked on a sill of the landing floor 1, 11a is a step extending between the fixed-side columns 11, 13 is a pair of movable-side columns that are configured to be slidable with respect to the fixed-side columns 11 by a guide rail (not shown) or the like,
13a is a step extending between the movable-side supports, 20 is a first ladder portion having the fixed-side supports 11 and the step 11a, 3
Reference numeral 0 denotes a second ladder portion including the movable support 13 and the step 13a.

Next, a description will be given of a case where the above-mentioned telescopic ladder 10 is used for work in a pit. For example, when performing maintenance and inspection of various devices arranged on the pit floor 3, the worker uses a ladder or the like to
Work directly down to the pit floor 3. However, in the replacement work of the main rope 9, the work from the pit floor 3 was difficult because the work location was considerably higher than the pit floor 3. Therefore, in such an operation, the shoe 12 of the fixed-side support 11 is fixed to the landing floor 1, and after the movable-side support 13 is extended to a predetermined length, the ladder 10 is lowered to move the movable-side support 13 to the counter. It rests on the top of the weight piece 7a in the frame 8. Thereafter, the work of replacing the main rope 9 with respect to the counterweight 7 was carried out by climbing the ladder 10 that was hung.

[0004]

The conventional telescopic ladder has the following problems because it is constructed as described above. That is, in work at a high place such as replacement work of the main rope 9, conventionally, a general-purpose telescopic ladder, that is, a structure in which the movable support is simply expanded and contracted with respect to the fixed support as described above. A ladder was used. When the telescopic ladder is moved up and down, the inclination angle of the ladder becomes extremely small, for example, when the working position is at a height that is not so different from the landing floor 1, so that the worker is forced to move up and down like a tightrope. There is a high risk that the worker may step off the steps or lose his balance when ascending or descending, causing a high risk of falling.If the ladder has a large inclination angle, the ladder becomes extremely unstable. In addition, there is a possibility that the ladder may fall and an unexpected situation may occur.
Therefore, in any case, there was a serious problem in terms of work safety.

[0005] The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to obtain a telescopic ladder capable of further improving work safety.

[0006]

Means for Solving the Problems Claim 1 according to the present invention.
Is a first ladder portion having a pair of fixed-side posts disposed on the floor surface, and a pair of movable-side posts provided to extend and contract relative to the fixed-side posts. In the telescopic ladder provided with the second ladder part having: a rotating shaft provided at the lower end of the second ladder part, and a transfer member pivotally attached to the second ladder part via the rotating shaft. It is provided.

[0007]

In the telescopic ladder according to the first aspect of the present invention, the second ladder portion is extended to a predetermined length with respect to the first ladder portion, and leans against a wall, a counterweight or the like in the elevator. A floor surface (for example, a landing floor surface) which is one step higher than a floor surface (for example, a pit floor surface) on which the fixed-side support is fixed by tilting the transfer member toward the worker around the rotation axis.
The transfer member can be placed on the. Therefore, the worker can safely go to the second ladder portion along the transfer member and then climb to the work place while stepping between the movable columns.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. The same or equivalent parts as those of the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

Embodiment 1 1 and 2 show the first embodiment of the present invention.
It is the perspective view and side view which show the telescopic ladder by Example of FIG. In FIGS. 1 and 2, reference numeral 10 denotes a telescopic ladder used for work at a high place in a pit, 11 denotes a pair of fixed-side supports having a shoe 12 fixed to a pit floor 3 at a lower end, 11
a is a step extending between the fixed columns 11, 12 a is a pin for rotatably connecting the fixed column 11 and the shoe 12, and 13 is a guide rail 14 for the fixed columns 11 of the first ladder portion 20. 13a is a step extending between the movable columns, and 15 is each movable column 13 of the second ladder portion 30.
Is a transfer member pivotally connected to the lower end of the first member via a rotation shaft 16.
The fixed-side support 11 is provided with a well-known lock lever (not shown) that engages with a plurality of engagement grooves (not shown) formed in the movable-side support 13. Thereby, the second ladder part 30 can be fixed to the first ladder part 20 at an arbitrary position.

The transfer member 15 has a pair of arms 15a connected to the movable column 13 by a rotating shaft 16 composed of a bolt or the like. The arm 15a has a predetermined length, and a thick transfer plate 15b is provided between the arms 15a.
Is fixed. A locking engaging groove 17a is formed inside the arm 15a, and the movable support 13
A spring lock piece 17b is provided on the outer side of the support member, and by the cooperation of the spring lock piece 17b and the engagement groove 17a, the transfer member 15 is detachably fixed to the movable-side support 13 with an appropriate spring biasing force. Can be.

The transfer plate 15b is fixed to the bottom 15aA of the arm 15a so that the movable support 13 can be accommodated in the transfer member 15 when the transfer member 15 is folded as shown in FIG. Preferably. Further, a working opening 18 is provided between the inner end 15bA of the transfer plate 15b and the rotating shaft 16, and the opening 18 allows a worker to move between the fixed support 11 and the movable support 13. Can be moved as needed. Further, a rope 19 having a predetermined length is fixed to the outer end 15bB of the transfer plate 15b, and the transfer member 15 can be quickly pulled out from the movable support 13 by the rope 19.

Using the telescopic ladder according to the present invention,
A case in which the main rope 9 is replaced will be described.
First, the ladder folded as shown in FIG. 3 is carried to the landing floor 1, from which the ladder is lowered, and the shoe 12 is fixed to a predetermined position on the pit floor 3. Then, the movable support 13 of the second ladder 30 is extended to a predetermined length while adjusting a lock lever (not shown) provided on the fixed support 11 of the first ladder 20. After that, the spring lock piece 17b is removed from the engagement groove 17a, and the ladder is lowered to move the movable support 13
Is leaned against the top weight piece 7a. Then, the ladder is adjusted to an appropriate angle with respect to the pit floor 3, for example, an angle of 70 to 75 ° (this angle is said to be appropriate for ascending and descending the ladder), and then the hanging rope is adjusted. 19, the transfer member 15 is hung on the landing floor 1, and the installation of the ladder is completed.

[0013] Thereafter, the user walks on the transfer board 15b to the second ladder part 30, and climbs up while stepping on the step 13a.
The main rope 9 is replaced. Since the worker can move from the second ladder portion 30 to the first ladder portion 20 through the opening 18, the pit floor surface 3
Work can also be performed. Then, after the replacement work of the main rope 9 is completed, the worker returns to the landing floor 1 via the second ladder portion 30 and the transfer member 15, and then contracts the movable-side support 13 and engages the spring lock piece 17b with the engagement groove. 17a, the transfer member 15 and the second ladder portion 30
Then, the ladder is pulled up from the landing floor 1, and the removal of the ladder is completed.

Embodiment 2 FIG. 4 and 5 are a front view and a side view showing a telescopic ladder according to a second embodiment of the present invention. The same or equivalent parts as those in the first embodiment are denoted by the same reference numerals, and only the differences will be described.

3 and 4, a pair of fixed-side columns 1
1, a pair of movable support columns 1 via a guide rail 14.
3 are provided. Further, a pair of arms 15a is pivotally mounted between the pair of movable supports 13 via a rotating shaft 16, and a transfer plate 15b is fixed between the arms 15a. Therefore, in the folded state of the ladder, the second ladder part 30 is accommodated inside the first ladder part 20, and the transfer member 15 is accommodated inside the second ladder part 30.
Then, as shown in FIG. 5, by forming the width L of the fixed-side support 11 large, the second ladder portion 30 and the transfer member 15 can be almost completely accommodated between the fixed-side support 11, The ladder can be made compact, and its handling and storage become extremely simple.

[0016]

According to the first aspect of the present invention, the telescopic ladder according to the first aspect includes the transfer members that rotate around the rotation shafts provided at the lower ends of the pair of second ladder portions, respectively. By placing the passing member on the floor surface (for example, the landing floor surface) which is one step higher than the floor surface (for example, the pit floor surface) where the side supports are fixed, the inclination angle of the passing member with respect to the inclination angle of the ladder is changed. Since it can be made extremely small, the worker can safely go to the second ladder portion along the transfer member. Therefore, the worker is not forced to go up and down like a tightrope, and can significantly improve the risk of the worker falling off the steps or losing balance during the climbing and falling. Thus, work safety can be greatly improved. Further, since the transfer member is integrated with the ladder via the rotation shaft, there is also an excellent effect that its handling and storage are extremely simple.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a telescopic ladder according to the present invention.

FIG. 2 is a side view showing a state where a telescopic ladder of the present invention is extended.

FIG. 3 is a side view showing a state in which the telescopic ladder of the present invention is folded.

FIG. 4 is a front view showing a second embodiment of the telescopic ladder of the present invention.

FIG. 5 is a side view of the telescopic ladder shown in FIG.

FIG. 6 is a side view showing a conventional telescopic ladder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 3 Floor surface 10 Telescopic ladder 11 Fixed side support 13 Movable side support 15 Transfer member 16 Rotation axis 20 1st ladder part 30 2nd ladder part

Claims (1)

(57) [Claims] 1. A first ladder portion having a pair of fixed-side supports disposed on a floor surface, and a pair of movable-side supports provided to extend and contract relative to the fixed-side supports. A retractable ladder having a second ladder portion, comprising: a rotating shaft provided at a lower end of the second ladder portion; and a transfer member pivotally attached to the second ladder portion via the rotating shaft. Telescopic ladder characterized by the following.