WO2021033984A1

WO2021033984A1 - Ladder capable of height adjustment of tray

Info

Publication number: WO2021033984A1
Application number: PCT/KR2020/010611
Authority: WO
Inventors: 장영균; 서동영
Original assignee: 장영균
Priority date: 2019-08-22
Filing date: 2020-08-11
Publication date: 2021-02-25
Also published as: CN112412323A; KR102099306B1; CN112412323B

Abstract

The present invention relates to a ladder capable of height adjustment of a tray, comprising: an outer support part; an inner support part provided to be extractable from the inside of the outer support part to the upper portion of the outer support part; an auxiliary support part arranged to face the outer support part while being spaced apart from the outer support part by a predetermined interval; a driving part that receives power from a rotating tool to lift or lower the inner support part; and a plurality of horizontal footholds provided on the outer support part, wherein the inner support part is characterized by: a support part providing a space on which a worker can step; and a tray arranged on the upper portion of the support part and providing a space on which work articles or tools can be placed.

Description

Ladder with adjustable tray height

The present invention relates to a ladder capable of adjusting the height of a tray, and in detail, to a ladder capable of adjusting the height of a tray configured to provide convenience and structural safety for a user to perform work on a position higher than the ground for a long time. About.

In general, a ladder is a device made to allow a person to step up and down a high or low place, and can be divided into a work ladder and a passage ladder.

Such a ladder may be configured to largely include a pair of vertical supports that are usually spaced apart from each other, and a plurality of horizontal scaffolds that are disposed vertically with a certain distance between the pair of vertical supports. .

A conventional ladder for work having the above configuration is shown in FIG. 6.

As shown in Fig. 9, the conventional work ladder has a configuration in which a plurality of horizontal scaffolds 20 are installed at regular intervals between a pair of first supports 10. In addition, unlike the ladder for passage, the work ladder is another second support 30 supporting the upper end of the first support 10 so that the first support 10 can be disposed on the ground at a predetermined inclination angle. It is equipped with. In addition, a working scaffold 40 may be provided at the top of the first support 20 and the second support 30 to help the operator to work.

The conventional working ladder configured as above may have a height adjusted due to a change in the distance between the first support 10 and the second support 30. However, it can be said that the maximum height of the working ladder is determined by the total length of the first support 10. In other words, the second support 30 can be said to be a configuration that promotes the safety of workers who perform work on the work ladder by stably supporting the first support 10, rather than for the purpose of varying the height of the working ladder. .

Here, the conventional working ladder has a configuration in which the length of the first support 10 cannot be changed. Accordingly, there is a problem in that the work cost is increased because there is a case in which the worker separately purchases and uses a working ladder having a height corresponding to the working height, or purchases and uses a working ladder having a height greater than necessary.

In order to solve the above problems, a method of assembling a separate support on the first support 10 is used, but this method increases the time required for disassembling and assembling the ladder, thereby reducing work efficiency.

In order to solve the above problems, the applicant has developed a ladder configured to allow an operator to easily adjust the length of the support, and “automatic ladder capable of adjusting the length with an electric screwdriver” is published in Korean Patent No. 10-1767014. Has been.

This automatic ladder consists of a first support as an inner/outer support, of which the inner support receives rotational force from a power tool such as an electric screwdriver or a manual tool such as an auxiliary handle, so that it can appear on the outer support. It can be said that it is characterized by varying the length of the support.

However, since this automatic ladder has a configuration in which a working scaffold on which an operator steps on to perform a task is provided on the upper portion of the inner support, there is a problem that a safety accident may occur during the task.

That is, if the inner support is pulled out from the outer support to increase the length of the first support, the working scaffold is also raised together with the inner support and is eventually placed at the top of the ladder, so that the worker working at the top of the ladder easily loses the center of gravity. There is a risk of falling off the ladder or losing the balance due to the load or movement of the worker.

In particular, since the outer support is supported by the second support even if it is arranged with a predetermined inclination angle on the ground, structural stability is ensured, and the risk of the above safety accident is reduced if the worker performs work on the outer support. In the case of the inner support, it is not a structure that is supported by a separate support, and when a worker loses its balance, it is always exposed to the risk of safety accidents because the body has to be supported only by the working scaffold.

In addition, there is a problem in that it is more difficult for the worker to climb up and down the inner supporter holding a heavy work article or tool, so that the risk of safety accidents is further exposed. Accordingly, a separate delivery of the work article or tool to the worker climbing the ladder There is a problem that labor costs are increased due to the need for working manpower.

That is, since the operator lifts the work piece or tool with one hand and moves up and down the outer support or the inner support with the other hand, there is a problem in the safety of the operator and the work efficiency is also poor.

On the other hand, a worker who uses a work ladder carries a separate toolbox in which items or tools necessary for work are stored.

In particular, depending on the position of the work, the work ladder and the tool box must be moved to an appropriate position, and there is a problem that the tool box cannot be disposed in the work space when the work space is narrow. In other words, if you need to perform work in a narrow work space where the tool box and the work ladder cannot be located at the same time, place the tool box in a separate place other than the work space because the space for placing the work ladder is secured first. Should be.

Therefore, in order to use the tool, the operator must frequently move the work space and the place where the tool box is arranged, and accordingly, there is a problem that the work is demanding and work efficiency is lowered.

In order to solve the above problems, a working ladder provided with a tool box has been developed and is currently being used.

However, in the conventional ladder for work provided with a tool box, since the tool box having the form of a multi-stage storage cabinet is disposed in the space between the outer support and the auxiliary support and is mounted on the connection frame provided on the upper end of the main support and the auxiliary support, , There is a disadvantage in that the above problems cannot be solved by increasing only the overall volume.

In other words, the conventional work ladder provided with a tool box has the advantage of being able to store a large amount of tools, but due to the increased overall volume, it takes up a lot of work space as well as a lot of space for storage. have.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a ladder capable of adjusting the height of a tray configured so that an operator can stably perform work even on the inner support taken out from the outer support.

In addition, the present invention is configured so that when the inner support is withdrawn from the outer support, a space in which various tools or members necessary for work can be placed is provided on the inner support so that the operator can conveniently perform the work on the inner support. The purpose is to provide a ladder that can adjust the height of the tray.

In addition, the present invention is capable of adjusting the height of the tray configured so that the pedestal and the tray are drawn out on the outer support by one-way rotation of the rotary tool, and conversely, the pedestal and the tray are accommodated as the outer support by the reverse rotation of the rotary tool. The purpose is to provide a ladder.

In addition, an object of the present invention is to provide a ladder capable of adjusting the height of a tray capable of providing a space in which tools can be accommodated without increasing the overall size.

In addition, an object of the present invention is to provide a ladder capable of adjusting the height of a tray configured so that the tool box in which the tool is accommodated is not exposed to the outside of the outer support or the auxiliary support when the outer support and the auxiliary support are folded.

In addition, the present invention provides a ladder capable of adjusting the height of a tray configured to firmly support the outer support and the auxiliary support while providing a space for storing tools when the outer support and the auxiliary support are spread apart from each other. It has a purpose.

The present invention, the outer support; An inner support portion provided to be retractable from the inside of the outer support portion to an upper portion of the outer support portion; An auxiliary support portion disposed to face the outer support portion while being spaced apart from the outer support portion by a predetermined distance; A driving unit that receives power from a rotating tool and raises or lowers the inner support portion; And a plurality of horizontal scaffolds provided on the outer support portion, wherein the height adjustment of the tray is possible, wherein the inner support portion comprises: a support portion providing a space in which a worker can step or sit with a foot; And a tray disposed above the support and providing a space in which a work article or a tool can be placed.

In addition, the support part and one end of the tray in the longitudinal direction may be rotatably connected to a surface of a pair of frames constituting the inner support part facing each other.

In addition, the support and the tray, when the inner support is drawn out on the outer support, is rotated in one direction and disposed in a horizontal direction, and when the inner support is inserted into the outer support, it is rotated in the other direction and the It may be disposed in a direction parallel to the longitudinal direction of the outer support or the inner support.

In addition, when the support part and the tray are inserted into the inner space of the outer support part, the support part and the tray may be disposed as a space between a pair of frames constituting the outer support part.

In addition, upper ends of a pair of frames constituting the auxiliary support may be rotatably connected to a gearbox constituting the driving unit.

In addition, the auxiliary support and the outer support further comprises a connecting piece that connects to each other while spaced apart from each other by a predetermined distance, the longitudinal end of the connecting piece is connected to the side surface of the gearbox, and the other end in the longitudinal direction constitutes the outer support It can be connected to the upper side of the frame.

In addition, the support part and the tray may be pulled out from the outer support part or inserted into the outer support part via a space formed between the auxiliary support part and the outer support part.

In addition, the support portion and the tray, when the inner support portion is inserted into the inner space of the outer support portion, the lower portion of the other longitudinal direction is contacted with the upper surface of the gearbox and rotated, and a separation formed between the auxiliary support portion and the outer support portion Can be inserted into space.

In addition, the frame constituting the outer support may be provided in the form of a guide rail having a'C'-shaped cross section.

In addition, rotation of the support part and the tray may be restricted by contacting a bottom surface with an inner surface of one side of the frame constituting the outer support part.

In addition, the plurality of horizontal scaffolds may be provided on an outer surface of a frame constituting the outer support so as not to interfere with the movement of the support and the tray.

In addition, a safety handle is provided on the inner support, and the safety handle is disposed at a position higher than the height of the tray, and when the inner support is inserted into the outer support, it is exposed to the top of the outer support. Can be.

In addition, a first link whose longitudinal end is rotatably connected to the frame constituting the outer support portion; A second link having one end rotatably connected to the other end in the longitudinal direction of the first link and the other end rotatably connected to the frame constituting the auxiliary support; And a tool box disposed along the lengthwise direction of the second link and connected to the second link, and providing a space in which a work article or tool can be accommodated.

In addition, the tool box is disposed in a horizontal direction within the space between the outer support and the auxiliary support when the auxiliary support is rotated in one direction to maximize the distance between the outer support and the auxiliary support. When the distance between the outer support portion and the outer support portion is maximally narrowed by being rotated in the direction, the auxiliary support portion or the outer support portion may be disposed in a direction parallel to the longitudinal direction of the auxiliary support portion within the space between the outer support portion and the auxiliary support portion.

In addition, the side surface of the tool box and one surface of the second link may be in surface contact with each other.

In addition, the tool box, when the auxiliary support is rotated in one direction to maximize the distance between the outer support and the outer support, the auxiliary support is arranged to be biased in the direction in which the auxiliary support is disposed within the space between the outer support and the auxiliary support. Can be.

In addition, the length of the tool box in the width direction may be shorter than a distance between a pair of frames constituting the outer support part or a distance between a pair of frames constituting the auxiliary support part.

In addition, it further includes a cover for opening and closing the formed opening of the tool box, the cover may be provided to be detachable from the tool box.

The ladder capable of adjusting the height of the tray according to the present invention has a configuration in which a support part for supporting a part of the body of a worker and a tray on which a work article or tool can be placed are provided on the inner support part drawn out from the outer support part. It provides convenience and stability of work to users.

In addition, the ladder capable of adjusting the height of the tray according to the present invention is capable of raising the inner support part to the extent that the tray is exposed on the outer support part, and then receiving the items or tools required for work in the tray in advance, and then raising the inner support part again. Since it has a structure, the operator does not need to lift the outer support or the inner support while holding a heavy article or tool, and accordingly, it is possible to ensure the stability of the work.

In addition, the ladder capable of adjusting the height of the tray according to the present invention has a configuration in which a tool box capable of accommodating work articles or various tools is provided so as to be rotatable within a space formed between the outer support part and the auxiliary support part. It provides convenience of work by not carrying a separate tool box.

In addition, the ladder capable of adjusting the height of the tray according to the present invention has a configuration in which the tool box is not exposed to the outside of the outer support portion and the auxiliary support portion when the outer support portion and the auxiliary support portion are folded together, so that it is stored in a narrow storage area. Can be.

In addition, in the ladder capable of adjusting the height of the tray according to the present invention, when the outer support portion and the auxiliary support portion are unfolded, the tool box maintains the distance between the outer support portion and the auxiliary support portion, and the distance between the outer support portion and the auxiliary support portion from horizontal external force It prevents unintentional narrowing so that the operator can safely perform work on the pedestal.

1 is a perspective view of a ladder capable of adjusting the height of the tray according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which the outer support portion and the auxiliary support portion of the ladder shown in FIG. 1 are open from each other;

Figure 3 is a perspective view showing a state in which the inner support shown in Figure 2 is raised on the outer support.

Figure 4 is a perspective view showing a state in which the inner support shown in Figure 3 is lowered toward the outer support.

5 is a perspective view showing a state in which a safety handle is provided on a tray according to an embodiment of the present invention.

Figure 6 is a perspective view showing a state in which a tool box is provided on the ladder shown in Figure 1;

7 is a perspective view showing a state in which the outer support portion and the auxiliary support portion shown in FIG. 6 are opened at a predetermined angle.

8 is a perspective view showing a state in which the outer support portion and the auxiliary support portion shown in FIG. 7 are maximally opened.

9 is a perspective view showing the configuration of a conventional ladder for work.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only these embodiments make the disclosure of the present invention complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have, and the invention is only defined by the scope of the claims.

Hereinafter, a ladder capable of adjusting the height of the tray according to the present invention will be described in detail with reference to FIGS. 1 to 5. In describing the present invention, detailed descriptions of related known functions or configurations are omitted so as not to obscure the subject matter of the invention.

1 to 4, the ladder 100 capable of adjusting the height of the tray according to an embodiment of the present invention includes an outer support part 110; An inner support part 120 provided to be retractable from the inside of the outer support part 110 to an upper portion of the outer support part 110; An auxiliary support 130 disposed to face the outer support 110 and spaced apart from the outer support 110 at a predetermined interval; A driving unit 140 for raising or lowering the inner support 120 by receiving power from a rotating tool; And a plurality of horizontal scaffolds 150 provided on the outer support part 110.

First, the outer support 110 may be configured to include a pair of first frames 111 that are spaced apart from each other at a predetermined distance.

The first frame 111 may be manufactured in a shape having a'C' cross section. That is, the first frame 111 has a shape in which three inner surfaces cooperate to form an inner space in which the inner support part 120 to be described later can be accommodated or transported, and one side thereof is open.

On the other hand, the pair of first frames 111 are arranged so that one side opening the inner space thereof faces each other.

In this outer support 110, as described above, a plurality of horizontal scaffolding 150 is provided. The horizontal scaffold 150 provides a space in which an operator can step on and go up and down along the length direction of the outer support 110.

The horizontal scaffolding 150 is connected to a pair of first frames 111 with longitudinal ends thereof, respectively, and may be provided in plural at a predetermined interval along the longitudinal direction of the first frame 111. At this time, the horizontal scaffold 150 is provided on the outer surface of the first frame () so as not to interfere with the movement of the second frame 121 and the pedestal 122 and the tray 123 of the inner support 120, which will be described later. It is desirable to be.

The inner support part 120 may be configured to include a pair of second frames 121 disposed to be spaced apart from each other at a predetermined distance.

The second frame 121 is manufactured in a shape having a rectangular cross-section as a whole, and may be accommodated in an inner space formed by the first frame 111 of the outer support 110.

In addition, the inner support portion 120, a support portion 122 that provides a space in which a worker can step or sit with a foot; And a tray 123 disposed above the support part 122 and providing a space in which a work article or tool can be placed.

The support part 122 may be made of a rigid material capable of withstanding the load of a worker while being light, such as a honeycomb board, and may have a rectangular shape. For example, the support part 122 is preferably designed to withstand a load of about 130 kg or more, and may be designed to have an area larger than the average foot size of an adult male. In addition, a non-slip member may be provided on the upper surface of the support part 122 to prevent a worker from slipping, or a plurality of friction protrusions may be formed.

The tray 123, as described above, is disposed on a position higher than the support unit 120, and may provide a space in which tools or articles necessary for work can be placed.

Since the tray 123 is not a component that supports the load of an operator, it may be designed to withstand a load of 20kg to 50kg of a work piece. In addition, the tray 123 may be manufactured in a form in which a separation preventing frame is formed on the circumferential surface so that a work article or tool placed on the upper surface thereof does not fall.

In addition, the tray 123 is preferably disposed on a higher position than the pedestal 122 so that an operator who has stepped on the pedestal 122 can easily grasp the work article or tool with his or her hand.

The support part 122 and the tray 123 as described above are rotatably connected to one end in the longitudinal direction on the surface of the pair of second frames 121 constituting the inner support part 120 facing each other through a hinge pin. I can.

At this time, the support part 122 and the tray 123, as shown in FIG. 3, when the second frame 121 of the inner support portion 120 is drawn out on the first frame 111 of the outer support portion 110 , It can be rotated in one direction by its own weight and placed in a horizontal direction. For reference, the hinge pin rotatably connecting the pedestal 122 and the tray 123 on the second frame 121 may be connected to a known leaf spring (not shown) to rotate in one direction. Therefore, when the support part 122 and the tray 123 are exposed to the upper part of the outer support part 110, they may be naturally rotated in one direction and disposed in a horizontal direction.

Here, the support part 122 and the tray 123 may be supported by a rotating support piece provided on the second frame 121 of the inner support part 120. For reference, one end of the rotation support piece may be rotatably connected to the inner surface of the second frame 121 and the other end may be connected to the side surface of the support part 122 or the tray 123. Therefore, the support part 122 and the tray 123 can be maintained in a horizontal state by the rotating support piece.

On the contrary, when the second frame 121 of the inner support part 120 is inserted into the first frame 111 of the outer support part 110, as shown in FIG. 4, , It can be rotated in the other direction and disposed in a direction parallel to the longitudinal direction of the outer support 110.

*And, the support portion 122 and the tray 123, as shown in Figs. 1 and 2, the second frame 121 of the inner support portion 120 is the first frame 111 of the outer support portion 110 ), it may be inserted into the spaced space between the pair of first frames 111 of the outer support part 110 and disposed.

At this time, the support part 122 and the tray 123 accommodated as a spaced space between the pair of first frames 111 may be prevented from being rotated as the bottom surface contacts the inner surface of one side of the first frame 111. . That is, the inner surface of one side of the first frame 111 may serve as a stopper so that the support part 122 and the tray 123 are not rotated in a space formed by the pair of first frames 111. In other words, when the second frame 121 is accommodated in the'U'-shaped space formed by the first frame 111, the end portions of the support part 122 and the tray 123 in the width direction are partially inserted. Therefore, the support part 122 and the tray 123 are blocked by the inner surface of one side of the first frame 111 to be prevented from being rotated in the horizontal direction in the spaced space formed by the pair of first frames 111. I can.

Meanwhile, a safety handle 124 may be further provided on the inner support part 120. The safety handle 124 may be disposed on a position higher than the height of the tray 134, and may be provided on the top of the pair of second frames 121 constituting the inner support 120.

Such, the safety handle 124, when the worker who performs the work while stepping on the horizontal footrest 150 or the pedestal 122 loses balance, it can be said to be a component for the worker to hold the balance by hand. have.

In addition, the safety handle 124 may be disposed above the first frame 111 when accommodated in the second frame 121 of the inner support portion 120 as the first frame 111 of the outer support portion 110. Therefore, the operator may hold the safety handle 124 to lift the inner support unit 120 on the outer support unit 110, or insert the inner support unit 120 into the inner space of the outer support unit 110. .

Accordingly, in a situation in which the rotating tool is not provided, the operator may use the safety handle 124 to pull out the inner support part 120 on the outer support part 110 or insert it into the inner space of the outer support part 110.

*

The auxiliary support unit 130 is composed of a pair of third frames 131 disposed to be spaced apart from each other at a predetermined interval, and serves to stably support the outer support units 110 disposed in an oblique direction.

The upper end of the third frame 131 may be rotatably connected to the gearbox 141 constituting the driving unit 140.

In addition, the third frame 131 of the auxiliary support part 130 and the first frame 111 of the outer support part 110 may be connected to each other through a connecting piece 132.

The connecting piece 132 serves to connect the auxiliary support unit 130 and the outer support unit 110 in a state spaced apart from each other. That is, one end in the longitudinal direction of the connecting piece 132 may be connected to a side surface of the gearbox 141 and the other end in the longitudinal direction may be connected to an upper side side of the first frame 111. In addition, a power transmission shaft of the gearbox 141 receiving power from a rotating tool or a known gear may be exposed on one side of the connecting piece 132 in the longitudinal direction.

By the above configuration, a spaced space through which the support part 122 and the tray 123 can pass may be formed at the upper end of the outer support part 110 and the auxiliary support part 130. That is, the support part 122 and the tray 123 pass through a space formed as the upper end of the first frame 111 of the outer support part 110 and the upper end of the third frame 131 of the auxiliary support part 130 are spaced apart from each other. Thus, it may be pulled out from the outer support part 110 or inserted into the outer support part 110.

On the other hand, in the receiving portion 122 and the tray 123, when the second frame 121 of the inner support portion 120 is inserted into the inner space of the first frame 111 of the outer support portion 110, the gearbox 141 The bottom of the other longitudinal direction is rotated by contacting the upper surface of the upper surface of the unit, and in this rotated state, the upper end of the first frame 111 of the rotating support unit 110 and the upper end of the third frame 131 of the auxiliary support unit 130 are spaced apart from each other. It can be inserted into the formed space.

The driving unit 140, as described above, receives power from a rotating tool and raises the second frame 121, the support unit 122, and the tray 123 of the inner support unit 120 on the outer support unit 110 Or, it may be referred to as a component that descends toward the outer support 110.

Since the detailed configuration of the driving unit 140 is described in detail in Registration Patent No. 10-1767014 filed and registered by the present applicant, in order not to obscure the gist of the invention in the specification of the present invention, a detailed configuration description thereof Is omitted.

Meanwhile, the rotary tool is preferably a known rotary lever having a groove into which the end of the power transmission shaft can be inserted, or an electric driver equipped with a driver bit that can be inserted into a groove formed at the end of the power transmission shaft. , In terms of quickly raising or lowering the inner support 120, it is most preferable to be implemented with an electric driver.

The operation of the ladder 100 capable of adjusting the height of the tray configured as described above will be described as an example.

First, the operator may rotate the third frame 131 of the auxiliary support unit 130 to increase the gap with the outer support unit 110. Then, as shown in FIG. 2, the outer support 110 can maintain an inclined state on the inclined ground.

In the above state, the electric driver is inserted into the end of the power transmission shaft exposed by the connecting piece 132, and the electric driver is operated to rotate in one direction.

Then, as shown in FIG. 3, the second frame 121 of the inner support 120 may be raised and exposed on the first frame 111 of the outer support 110. At this time, the pedestal 122 and the tray 123 may be rotated in one direction by their own weight to maintain a horizontal state. For reference, the operator loads the work item or tool in advance on the tray 123 that is exposed on the outer support part 110 and rotates in a horizontal state, and then reloads the inner support part 120 on the outer support part 110 by using an electric screwdriver. You can also raise it. Then, the tray 123 also serves as a lift, so that the operator does not need to separately lift the outer support 110 while holding a heavy work article or tool in his hand.

When the inner support part 120 is completely withdrawn from the outer support part 110, the operator can perform the work while stepping on the horizontal foot plate 150 and the support part 122.

When the work is completed, the operator inserts the electric driver into the end of the power transmission shaft exposed by the connecting piece 132, and operates the electric driver to rotate in the other direction.

Then, as shown in FIG. 4, the second frame 121 of the inner support portion 120 may be inserted into the inner space of the first frame 111 of the outer support portion 110. At this time, the support part 122 and the tray 123 are rotated in the other direction as the bottom surface of the other side in the longitudinal direction is in contact with the upper surface of the gearbox 141, and then the separation formed between the pair of first frames 111 Can be inserted into space.

Finally, the operator may rotate the auxiliary support unit 130 in the direction in which the outer support unit 110 is disposed, as shown in FIG. 1. Then, the overall size of the ladder is changed into a form that is easy to store, and accordingly, the operator can place the ladder in a narrow space.

Until now, specific embodiments according to the present invention have been described, but, of course, various modifications may be made without departing from the scope of the present invention.

For example, in an embodiment of the present invention, the safety handle 134 is illustrated in the description and drawings as being provided on the upper end of the second frame 121 constituting the inner support part 120, but is not limited thereto. .

For example, as shown in FIG. 5, the safety handle 134 may be connected to the tray 133 and may be rotated together with the rotation of the tray 133. At this time, the process of rotating the tray 133 connected to the safety handle 134 to be inserted into the inner space of the outer support 110 may be artificially performed by an operator. Likewise, the process of arranging the tray 133 exposed to the outside of the outer support part 110 in a horizontal direction may be artificially performed by an operator.

On the other hand, the ladder 100 capable of adjusting the height of the tray according to an embodiment of the present invention, as shown in Figs. 6 to 9, a tool box provided between the outer support 110 and the auxiliary support 130 It may further include (160).

The tool box 160 forms a space in which items or tools required for work can be stored, and may have a box shape in a longitudinal direction with an open top as a whole.

The tool box 160 includes a first link L1 whose longitudinal end is rotatably connected to the first frame 111 constituting the outer support part 110 and the longitudinal direction of the first link L1 The outer support 110 while connected to the second link L2 rotatably connected to the third frame 131 constituting the auxiliary support 130 and the other end of the longitudinal end is rotatably connected to the other end. ) And the auxiliary support 130 may be provided.

The first link L1 is rotatably connected to one end in the longitudinal direction on the surface of the pair of first frames 111 constituting the outer support part 110 facing each other, and the other end in the longitudinal direction is described above. As described above, it may be rotatably connected to one end of the second link L2 in the longitudinal direction.

One end in the longitudinal direction of the second link (L2) is rotatably connected to the other end in the longitudinal direction of the first link (L1) as described above, and in addition, may be rotatably connected to the outer surface of the tool box (160). have. In addition, the other end in the longitudinal direction of the second link L2 may be rotatably connected on a surface of the pair of second frames 121 constituting the auxiliary support 130 facing each other.

Tool box 160, as shown in Figure 8, when the auxiliary support 130 is rotated in one direction to maximize the distance between the outer support 110 and the outer support 110 and the auxiliary support 130 It can be arranged horizontally within the space of

At this time, the other end in the longitudinal direction of the first link (L1) is rotated in a direction away from the first frame 111 of the outer support portion 110, and the longitudinal end of the second link (L2) is It is rotated in a direction away from the second frame 131.

Then, as shown in FIG. 8, the first link (L1) and the second link (L2) are horizontally disposed in the space between the outer support portion 110 and the auxiliary support portion 130 while having a straight line connected to each other. The distance between the outer support part 110 and the auxiliary support part 130 is maintained, and in addition, it is possible to prevent the auxiliary support part 130 from being unintentionally rotated on the outer support part 110.

In addition, when the distance between the outer support part 110 and the auxiliary support part 130 is maximized, the first link (L1) and the second link (L2) maintain the distance and at the same time change the distance from external force. In terms of preventing, it is preferable that one surface of the second link L2 facing the outer surface of the tool box 160 is in surface contact with the outer surface of the tool box 160.

That is, the force to rotate the first link (L1) or the second link (L2) by the horizontal external force that is unintentionally transmitted to the outer support unit 110 or the auxiliary support unit 130 is applied to the weight of the tool box 160 It is preferable to make surface contact between one surface of the second link L2 and the outer surface of the tool box 160 so that it can be offset by the second link.

Then, various articles including the tool box 160 and the weight of the tool are directly transmitted to the second link L2, and accordingly, the first link L1 and the second link ( L2) is rotated to further prevent the distance between the outer support portion 110 and the auxiliary support portion 130 from narrowing.

On the other hand, the tool box 160, as shown in Figure 6, when the auxiliary support 130 is rotated in the other direction and the distance between the outer support 110 is maximally narrowed, the outer support 110 and the auxiliary support The space between the pair of third frames 131 constituting the auxiliary support unit 130 while being disposed in a direction parallel to the longitudinal direction of the auxiliary support unit 130 or the outer support unit 110 within the space between the 130 Can be accommodated in

At this time, the other end in the longitudinal direction of the first link L1 is rotated in a direction close to the first frame 111 of the outer support part 110, and one end in the longitudinal direction of the second link L2 is It is rotated in a direction close to the third frame 131. Then, as shown in Figure 6, the first link (L1) is arranged parallel to the length direction of the first frame 111, the second link (L2) is parallel to the length direction of the second frame (121). Can be arranged.

In the above state, the outer support 110 and the auxiliary support 130 may be folded to each other in a form that facilitates transport and storage by the operator.

In particular, when the outer support portion 110 and the auxiliary support portion 130 are folded to each other, the space between the pair of third frames 131 constituting the auxiliary support portion 130 so that the tool box 160 is not exposed to the outside Since it has a structure provided in the space, there is an advantage that the ladder 100 can be stored in a narrow storage place.

For reference, the length of the tool box 160 in the width direction is a distance between the pair of first frames 111 constituting the outer support portion 110 or the third pair constituting the auxiliary support portion 130 It can be said that the frames 131 are shorter than the distance apart from each other. In other words, when the outer support part 110 and the auxiliary support part 130 are folded, the tool box 160 is spaced between the pair of first frames 111 and the space between the pair of third frames 131 In order to be accommodated as a space, it is naturally desirable to design the length in the width direction to be short.

On the other hand, the tool box 160, as shown in Figure 8, when the auxiliary support 130 is rotated in one direction to maximize the distance between the outer support 110 and the outer support 110 and the auxiliary support ( It may be arranged to be biased in the direction in which the auxiliary support part 130 is arranged within the space between 130). That is, when the outer support part 110 and the auxiliary support part 130 are unfolded and the tool box 160 is disposed in the horizontal direction, the other side in the longitudinal direction is outside of the third frame 131 constituting the auxiliary support part 130. It can be exposed.

As described above, the reason for distributing the tool box 160 to be biased in the direction in which the auxiliary support unit 130 is disposed is to maintain a weight balance between the outer support unit 110 and the auxiliary support unit 130. That is, in order to maintain the balance with the load of the outer support unit 110 by increasing the load on the side of the auxiliary support unit 130 so that the operator who works while stepping on the pedestal 122 can safely perform the work.

The tool box 160 is accommodated in a space formed between the pair of third frames 121 when the outer support part 110 and the auxiliary support part 130 are folded to each other, so the tool box 160 disposed in this space ), a member such as a reinforcing frame cannot be provided between the pair of second frames 121. Therefore, when the outer support unit 110 and the auxiliary support unit 130 are unfolded, the load of the auxiliary support unit 130 is relatively smaller than the load of the outer support unit 110 and the operator cannot maintain the balance in the pedestal 122 Occurs. In order to prevent this phenomenon, it is preferable to provide the tool box 160 to be biased in the direction in which the auxiliary support part 130 is disposed.

Meanwhile, the opening formed in the tool box 160 may be opened and closed by a separate cover (not shown). The cover may be detachably coupled to the tool box 160 in a sliding manner to open or close the open portion of the tool box 160.

Therefore, the scope of the present invention should not be defined by being limited to the described embodiments, and should be defined not only by the claims to be described later, but also by the claims and their equivalents.

The present invention can be applied and sold in various industrial fields such as construction field, architecture field, and painting field.

Claims

Outer support; An inner support portion provided to be retractable from the inside of the outer support portion to an upper portion of the outer support portion; An auxiliary support portion disposed to face the outer support portion while being spaced apart from the outer support portion by a predetermined distance; A driving unit that receives power from a rotating tool and raises or lowers the inner support portion; In the ladder capable of adjusting the height of the tray comprising a; and a plurality of horizontal scaffolding provided on the outer support,

The inner support,

A support part providing a space in which an operator can step on; And

A tray disposed on the upper portion of the support and providing a space in which a work article or a tool can be placed; a ladder capable of adjusting the height of the tray.
The method of claim 1,

A ladder capable of adjusting the height of the tray at one end in the longitudinal direction of the support portion and the tray, wherein a pair of frames constituting the inner support portion are rotatably connected to faces facing each other.
The method of claim 2,

The support portion and the tray,

When the inner support is withdrawn from the outer support, it is rotated in one direction and disposed in a horizontal direction,

When the inner support is inserted into the outer support, it is rotated in another direction and is arranged in a direction parallel to the longitudinal direction of the outer support or the inner support.
The method of claim 3,

The support portion and the tray,

When the inner support portion is inserted into the inner space of the outer support portion, a ladder capable of adjusting the height of the tray is disposed as a space between a pair of frames constituting the outer support portion.
The method of claim 4,

A ladder capable of adjusting the height of the tray, characterized in that the upper end of the pair of frames constituting the auxiliary support unit is rotatably connected to a gear box constituting the driving unit.
The method of claim 5,

The auxiliary support and the outer support further comprises a connecting piece that connects to each other while spaced apart a predetermined distance from each other,

A ladder capable of adjusting the height of a tray, characterized in that one end in the longitudinal direction of the connecting piece is connected to a side surface of the gearbox, and the other end in the longitudinal direction is connected to an upper side side of the frame constituting the outer support.
The method of claim 6,

The support portion and the tray,

A ladder capable of adjusting the height of a tray, characterized in that it is pulled out from the outer support portion or inserted into the outer support portion through a space formed between the auxiliary support portion and the outer support portion.
The method of claim 7,

The support part and the tray, when the inner support part is inserted into the inner space of the outer support part, contact the upper surface of the gearbox and rotate, and then inserted into a space formed between the auxiliary support part and the outer support part. Ladder with adjustable height of tray.
The method of claim 4,

The frame constituting the outer support part is a ladder capable of adjusting the height of the tray, characterized in that it is provided in the form of a guide rail having a'C'-shaped cross section.
The method of claim 9,

A ladder capable of adjusting the height of the tray, characterized in that rotation of the support part and the tray is restricted by contacting a bottom surface with an inner surface of one side of the frame constituting the outer support part.
The method of claim 9,

The plurality of horizontal scaffolds are provided on the outer surface of the frame constituting the outer support part so as not to interfere with the movement of the support part and the tray.
The method of claim 3,

Including that the inner support is provided with a safety handle,

The safety handle is disposed at a position higher than the height of the tray, and when the inner support portion is inserted into the outer support portion, it is exposed to the upper portion of the outer support portion.
The method of claim 1,

A first link whose longitudinal end is rotatably connected to the frame constituting the outer support portion;

A second link having one end rotatably connected to the other end in the longitudinal direction of the first link and the other end rotatably connected to the frame constituting the auxiliary support; And

A tool box disposed along the lengthwise direction of the second link and connected to the second link, and providing a space for storing a work article or a tool; ladder.
The method of claim 13,

The tool box,

When the auxiliary support portion is rotated in one direction so that the distance between the outer support portion is maximized, it is disposed in a horizontal direction within the space between the outer support portion and the auxiliary support portion,

When the auxiliary support is rotated in the other direction and the distance between the outer support and the outer support is maximally narrowed, the auxiliary support or the outer support is disposed in a direction parallel to the longitudinal direction of the outer support and the space between the outer support and the auxiliary support. A ladder with adjustable height of the tray.
The method of claim 14,

A ladder capable of adjusting the height of the tray, characterized in that the side surface of the tool box and one surface of the second link are in surface contact with each other.
The method of claim 15,

The tool box,

When the auxiliary support portion is rotated in one direction to maximize the distance between the outer support portion and the outer support portion, the tray, characterized in that the auxiliary support portion is arranged to be biased in the direction in which the auxiliary support portion is disposed within the space between the outer support portion and the auxiliary support portion. Ladder with adjustable height.
The method of claim 16,

The length of the tool box in the width direction is shorter than a distance between a pair of frames constituting the outer support unit or a distance between a pair of frames constituting the auxiliary support unit spaced apart from each other. ladder.
The method of claim 17,

Further comprising a cover for opening and closing the formed opening of the tool box,

The cover is a ladder capable of adjusting the height of the tray, characterized in that provided to be detachably attached to the tool box.