JPS6345518Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a telescoping ladder that can be freely adjusted.

Conventionally, this type of extendable ladder has been comprised of a main ladder and a child ladder slidably supported by the main ladder, and can be adjusted to extend or contract by pulling a rope. In addition, the fixing hook body provided on the side of the child ladder is removably engaged with the treadle of the main ladder from above, thereby preventing the child ladder from descending and holding the entire ladder at the desired length. It was configured to be When the rope is pulled again, the hook body is automatically disengaged, and the ladder is configured to be able to be freely adjusted. However, with a telescopic ladder of this kind of configuration, if a worker who has climbed onto the roof, etc. tries to change the installation position of the ladder by lifting the upper part of the ladder, that is, the upper part of the sub-ladder, from the roof, the There is a risk that relative sliding may occur between the ladder and the main ladder, and this relative sliding may inadvertently release the engagement of the hook body, making it impossible to engage the hook body with the same treadle again. Therefore, when changing the installation position of a ladder, the worker must first get down to the ground and then operate the ladder, which takes time and effort to go up and down the ladder.
It had the drawback of being troublesome.

Therefore, in view of the above-mentioned problems, the present invention prevents relative sliding between the child ladder and the main ladder when the child ladder is lifted upward, and provides an easy-to-use product. comprises a main ladder and a child ladder slidably supported by the main ladder, an upper pulley is pivotally supported on the upper part of the side rung of the main ladder via an upper fixture, and a lower pulley is supported on the lower part of the side rung of the child ladder. The lower pulley is pivotally supported via a fixture, one end of the rope body is fixed to the upper fixture, and the other end is hung on the upper pulley via the lower pulley, and can be expanded and contracted by pulling the other end. In a telescopic ladder that is adjustable and in which a fixing hook body provided on a child ladder can be freely engaged and detached from a treadle of a master ladder, the lower fixture is connected to a pulley case body that pivotally supports a lower pulley, and a pulley case body. In addition to supporting the body so that it can move up and down, the braking contact part provided on one side of the pulley case body gradually approaches the side bars of the main ladder as it descends so that it can freely come into contact with and separate from the side bars of the main ladder. The guide body is fixed to the lower ladder side rod, and the pulley case body is provided with a biasing body that elastically biases the pulley case body in the downward direction.

Hereinafter, embodiments of the present invention will be described based on the drawings. In FIGS. 1 to 7, 1 is a parent ladder;
2 is a child ladder, as shown in Figure 4,
Each of the side rods 3 and 4 is made of rod material with a U-shaped cross section.
With their respective open surfaces facing each other, one side of each side rod 3 and 4 is overlapped with each other, so that the child ladder 2 is connected to the parent ladder 1.
are connected and supported so as to be slidable in the longitudinal direction. Further, a plurality of tread bars 5, 6 are installed between the respective side bars 3, 3, 4, 4 at predetermined intervals. An upper fitting 7 is fixed to the upper part of the side rung 3 of the main ladder 1 with rivets or the like, and the upper fitting 7 is placed in a cylindrical pulley support part 8 formed overhanging the open side of the child ladder 2. A pulley 9 is pivotally supported by a rivet or the like. Further, a lower fitting 10 is provided at the lower part of the side beam 4 of the child ladder 2, and as shown in FIGS.
, with the open side connected to the side rod 3 of the main ladder 1 and the side 12
One side wall 13 of the guide body 11 is fixed to the side rod 4 by rivets or the like so as to face the guide body 11 . And between the opposing side walls 13 and 14 of the guide body 11,
A pulley case body 15 is provided so as to be relatively slidable in the vertical direction, and the pulley case body 15 is formed in a cylindrical shape penetrating in the vertical direction. A lower pulley 17 is pivotally supported by a pulley support shaft 16 passing through the upper part of the pulley case body 15 in the lateral direction, and a spring locking shaft 18 is provided in the lower part thereof in a penetrating manner in the lateral direction. Both protruding ends of the pulley support shaft 16 and the spring locking shaft 18 extend along guide grooves 19 and 20 formed opposite to each other on both side walls 13 and 14 of the guide body 11, as shown in FIG. As shown in FIG. 7, the guide grooves 19 and 20 are formed in an inclined shape so as to gradually approach one side surface 12 of the side beam 3 of the main ladder 1 with respect to the downward direction. The pulley support shaft 16 and the spring locking shaft 1 are shown here.
8 and the respective guide grooves 19 and 20, the pulley case body 15 is supported by the guide body 11 in a vertically movable manner, and as it descends, one side of the side rod 3 of the main ladder 1 12. Also, one side 12 of the side rod 3 of the pulley case body 15
As shown in FIGS. 6 to 8, a brake contact portion 22 is removably fixed to the wall surface 21 corresponding to the side by screws 23 or the like. The braking contact portion 2
2 is composed of a rubber body 24 as a band-shaped and annular contact body, and a mounting support plate 25 that is fitted into the rubber body 24 and attaches the rubber body 24 to the wall surface 21 with the screws 23. There is. and,
As the pulley case body 15 descends, one side of the brake abutting portion 22 comes into contact with the side 12 of the side rod 3 so as to be able to move toward and away from it, as shown in FIG. Further, a resin end fitting 26 is fitted to the lower end of the side beam 4 of the child ladder 2, and is fixed with screws 27, nuts 28, etc. And one screw 27 has a 9th
As shown in the figure, a collar 29 is fitted onto the outside, and a coil spring 30 as a biasing body is stretched between the collar 29 and the stepped portion of the spring support shaft 18, and the pulley case body 15 is lowered. The bullet is biased in the direction. Reference numeral 31 denotes a rope as a rope body, and as shown in FIGS. 5 and 7, one end 32 is connected and fixed to the lower part of the pulley support part 8 of the upper fixture 7, and the other end of the rope 31 is connected to the lower pulley 17. It is configured so that it is hung on the upper pulley 9 via the upper pulley 9, and the other end is suspended so that it can be pulled freely, or it is tied to a suitable position on the main ladder 1. The pulling operation of the rope 31 causes relative sliding between the main ladder 1 and the child ladder 2, allowing them to be freely adjusted for expansion and contraction. Further, at the lower part of the side rung 4 of the child ladder 2, as shown in FIGS. 2, 11, and 12, a fixing hook body 33 is removably engaged with the step 5 of the main ladder 1. is swingably provided, and a spring body 35 is provided that biases the engaging portion 34 of the hook body 33 in a direction in which it engages with the step 5. Further, a kicking pawl 36 is swingably supported in the middle part of the hook body 33, and when the child ladder 2 is raised, one side of the hook body 33 comes into contact with the treadle 5 of the main ladder 1, and also Due to the relative sliding, the hook body 33 is moved in the direction of arrow P by the spring body 35.
a cam surface 37 that rotates against the elastic force of the
On the other hand, a cam surface 38 is also provided on the lower surface of the kicking pawl 36, and when the child ladder 2 is lowered, the cam surface 38
comes into contact with the rung 5 of the main ladder 1 from above and is slid relative to it, and this relative sliding causes the hook body 33 to rotate in the direction of arrow P against the elastic force of the spring body 35. Further, at this time, as shown by the imaginary line in FIG. 11, since the engaging portion 34 of the hook body 33 is blocked by the claw 36, engagement between the engaging portion 34 and the treadle 5 is prevented.

The embodiment of the present invention is constructed as described above, and when adjusting its expansion and contraction, by pulling the rope 31 as in the conventional case, as shown in FIG.
The pulley case body 15 is moved upward along the guide grooves 19 and 20 of the guide body 11 against the elastic force of the coil spring 30, and the braking contact portion 22 is brought into contact with the one side surface 12 of the side rod 3 of the main ladder 1. The connection is released, and in this state, the child ladder 2 is slid upward. Then, at a desired position, the engaging portion 34 of the hook body 33 is engaged with the treadle 5, and the overall length of the ladder is maintained constant. When the rope 31 is released, the tension acting on the rope 31 is released, and the pulley case body 15 is lowered along the guide grooves 19 and 20 by the elastic force of the coil spring 30, as shown in FIG. As shown, the braking contact portion 22 provided on the pulley case body 15 is
It is elastically abutted against one side 12. In this state, for example, if the upper part of the child ladder 2 is lifted from the roof, the brake contact part 22 and the side 12 of the side rod 3
is elastically abutted, and the pulley case body 1
5, the side rod 3 approaches the side surface 12 as the side rod 3 descends, so the brake abutting portion 22 is strongly pressed against the side rod 3 side 12, and the brake abutting portion 22 and the side rod 3 side 12 Therefore, relative sliding between the main ladder 1 and the child ladder 2 is prevented, and disengagement of the hook body 33 can be prevented.
Therefore, the installation position of the ladder can be easily changed even from the roof, and there is no need to go down to the ground to operate it, making it easy to use. In addition, when shortening the ladder, the rope 31 is towed once as in the conventional case.
After moving the kick claw 36 above the step 5, if it is loosened, the child ladder 2 is lowered by its own weight. At this time, each treadle 5 is
The hook body 33 is lowered while avoiding engagement with the hook body 33. In addition, it has a simple structure in which the lower fixture 10 is divided into the pulley case body 15 and the guide body 11, and can be easily manufactured. Can be adapted. Furthermore, since the braking contact portion 22 is automatically brought into elastic contact with the side surface 12 of the side rod 3 by the coil spring 30, it is easy to use.

In the above embodiment, the brake abutment part 22 is detachably attached to the pulley case body 15, but it may be provided integrally. Further, unevenness may be provided on the contact surface side of the rubber body 24 to prevent slipping, and the present invention is not limited to the embodiment. Further, although a structure in which the pulley case body 15 moves up and down along the guide grooves 19 and 20 of the guide body 11 is shown, it may be a protrusion, and is not limited to the example.

The present invention is constructed as described above, and the installation position can be easily changed even from the roof.
It is easy to use as there is no need to go down to the ground to operate it. Further, it has a simple structure, can be manufactured easily, and has the advantage of being compatible with conventionally structured telescopic ladders.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view in an extended state, Fig. 2 is a side view of the same, Fig. 3 is a side view in a contracted state, and Fig. 4 is an enlarged cross-sectional view of Fig. 2. 5 is a view taken from FIG. 4 - a view taken along the line, FIG. 6 is an enlarged cross-sectional view taken from FIG. Figure 9 is an enlarged sectional view of the main part of the figure, Figure 9 is an enlarged cross-sectional view taken along the line XI-XI in Figure 7, and Figure 10 shows the braking contact part of the pulley case body in contact with one side of the side rod of the main ladder. A side view of the main parts showing the condition,
11 is an enlarged view taken along the line XI-XI in FIG. 1, and FIG. 12 is a sectional view taken along the line XII-XII in FIG. 11. 1... Main ladder, 2... Child ladder, 3, 4... Side beam, 5, 6... Step rung, 7... Upper fixture, 9... Upper pulley, 10... Lower fixture, 11... ...Guide body, 1
2... One side, 15... Pulley case body, 17...
Lower pulley, 19, 20... Guide groove, 22... Brake contact portion, 30... Coil spring, 31... Rope,
33... hook body, 36... sharp claw.

Claims (1)

[Scope of utility model registration request] Comprising a main ladder and a child ladder slidably supported by the main ladder, an upper pulley is pivotally supported at the upper part of the side rung of the main ladder via an upper fixture, and a lower fixture is mounted at the bottom of the side rung of the child ladder. The lower pulley is pivotally supported through the rope, one end of the rope body is fixed to the upper fixture side, and the other end is hung on the upper pulley via the lower pulley, and can be expanded and contracted by pulling the other end. In the telescopic ladder in which the fixing hook body provided on the child ladder can be freely engaged and detached from the treadle of the main ladder, the lower fixture has a pulley case body which pivotally supports the lower pulley, and a pulley case body. While supporting the pulley case so that it can move up and down, it gradually approaches the side rod of the main ladder as it descends so that the braking contact part provided on one side of the pulley case body comes into contact with the side rod of the main ladder so that it can move toward and away from the side rod of the main ladder. What is claimed is: 1. A telescoping ladder comprising: a guide body for guiding in a downward direction, the guide body being fixed to a side rod of a sub-ladder, and a biasing body resiliently biasing a pulley case body in a downward direction.