CN112412323A

CN112412323A - Ladder with adjustable tray height

Info

Publication number: CN112412323A
Application number: CN202010848090.5A
Authority: CN
Inventors: 张永均; 徐东英
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-22
Filing date: 2020-08-21
Publication date: 2021-02-26
Anticipated expiration: 2040-08-21
Also published as: WO2021033984A1; CN112412323B; KR102099306B1

Abstract

The invention provides a ladder capable of adjusting the height of a tray, which comprises: an outer support portion; an inner support part which is provided so as to be drawn out from the inside of the outer support part to the upper part of the outer support part; an auxiliary support part arranged opposite to the outer support part in a state of being separated from the outer support part by a certain interval; a driving part for receiving the power transmitted by the rotating tool to make the inner supporting part ascend or descend; and a plurality of horizontal pedals disposed on the outer support portion. The medial support portion includes: a base plate part for providing a space on which an operator can step; and a tray disposed above the pad portion and providing a space in which work items or tools can be placed.

Description

Ladder with adjustable tray height

Technical Field

The invention relates to a ladder with adjustable tray height, in particular to a ladder with adjustable tray height, which can provide convenience for operation and structural safety when a user operates for a long time at a position higher than the ground.

Background

Generally, a ladder is a mechanism that a person can step on by feet when going up and down at a high place or a low place, and is classified into a ladder for work and a ladder for passage.

The ladder generally includes a pair of vertical brackets spaced apart from each other and a plurality of horizontal steps disposed between the pair of vertical brackets at a predetermined interval.

Fig. 9 shows a conventional work ladder having the above-described structure.

As shown in fig. 9, the conventional ladder for work has a structure in which a plurality of horizontal steps 20 are provided between a pair of first brackets 10 at a predetermined interval. Further, the working ladder is different from the passage ladder in that another second support 30 is provided to support the upper end of the first support 10 so that the first support 10 can be formed at a predetermined inclination angle on the ground. The upper ends of the first bracket 20 and the second bracket 30 are provided with operation pedals 40 which are convenient for operators to operate.

The conventional ladder for work configured as described above is adjusted in height by changing the interval between the first bracket 10 and the second bracket 30. The maximum height of the working ladder may depend on the overall length of the first support 10. That is, the second support 30 is not intended to change the height of the working ladder, but is intended to stably support the first support 10 and ensure the safety of the worker who works on the working ladder.

Here, the length of the first bracket 10 is not variable from the structure of the conventional work ladder. The operator needs to purchase a ladder for operation having a height corresponding to the operation height, or purchase a ladder for operation having a height greater than the required height, which causes a problem of increased operation cost.

In order to solve the above problems, a method of assembling the independent bracket to the first bracket 10 is currently used, but this method increases time required for disassembling and assembling the ladder, thereby reducing working efficiency.

The present applicant has developed a ladder in which an operator can easily adjust the length of a bracket in order to solve the above-mentioned problems, and has disclosed an "automatic ladder adjustable in length by a motor-driven screwdriver" in korean registered patent No. 10-1767014.

The automatic ladder is characterized in that the first support is divided into an inner support and an outer support, wherein the inner support receives the rotating force transmitted by an electric tool such as an electric screwdriver or a manual tool such as an auxiliary handle, and the inner support can be moved out and in the outer support, so that the length of the first support is changed.

However, since the working steps that the operator steps on with his/her feet during the work are disposed at the upper end of the inside bracket, there is a possibility that a safety accident may occur during the work.

That is, when the inner bracket is drawn out to the outer bracket in order to extend the length of the first bracket, the working step is also lifted together with the inner bracket and disposed at the uppermost end of the ladder, so that the worker in the uppermost end of the ladder easily loses the center of gravity and falls off the ladder, or the ladder is out of balance due to the load or the operation of the worker and may fall down.

In particular, even if the outer bracket is disposed on the ground at a predetermined inclination angle, but is supported by the second bracket, the structural stability thereof is secured and the risk of a safety accident is reduced as described above when the operator works on the outer bracket, but the inner bracket is not supported by other brackets and the operator loses balance, and is only supported by the working pedal, so that there is always a risk of a safety accident.

Further, there is a problem that the risk of a safety accident occurring when an operator carries a heavy object, a tool, or the like up and down on the inner support is further increased, and the labor for transferring an operation article or a tool to the operator on the ladder is also increased, thereby increasing the labor cost.

That is, since the worker holds the work or the tool with one hand and holds the outer bracket or the inner bracket up and down with the other hand, the worker has a great problem in safety and the work efficiency is also lowered.

In addition, a worker using a ladder for work generally carries a tool box in which articles or tools necessary for work are loaded.

In particular, depending on the working position, the working ladder and the toolbox need to be moved to appropriate positions, but if the working space is narrow, the toolbox cannot be placed in the working space. That is, when work cannot be performed in a work space in which a tool box and a work ladder cannot be placed at the same time due to a narrow space, the tool box is placed only in other places while a space in which the work ladder can be placed is first secured.

Therefore, the worker must frequently move between the places where the toolboxes are placed in the working space using the tools, which causes a problem that the work is laborious and the working efficiency is reduced.

In order to solve the above-described problems, a ladder for work including a tool box has been developed.

However, the conventional ladder for work having a toolbox in the form of a multi-deck storage container is disposed in a space between an outer support and an auxiliary support and is assembled to a connection frame disposed at the upper ends of a main support and an auxiliary support, and has a drawback that the overall size is increased, but the above problem cannot be solved.

In other words, the conventional work ladder having a tool box has an advantage of accommodating a large number of tools, but has a drawback of occupying a large work space and a large storage space due to its large overall volume.

Disclosure of Invention

The present invention has been made to solve the above-described problems, and a main object of the present invention is to provide a ladder with an adjustable tray height, which enables a worker to safely perform work even on an inner bracket extended from an outer bracket.

Another object of the present invention is to provide a ladder capable of adjusting a height of a tray, in which a space for placing various tools and components required for work is formed in an inner frame when the inner frame is drawn out from an outer frame, and an operator can easily perform work on the inner frame.

Another object of the present invention is to provide a ladder capable of adjusting the height of a tray, in which a mat portion and the tray are drawn out from an outer holder as a rotary tool rotates in one direction, and conversely, the mat portion and the tray are accommodated in the outer holder as the rotary tool rotates in the reverse direction.

It is another object of the present invention to provide a ladder with an adjustable tray height that provides space for receiving tools without increasing the overall size.

Another object of the present invention is to provide a ladder capable of adjusting a height of a tray, in which a tool box for receiving tools is not exposed to the outside of an outer support portion or an auxiliary support portion when the outer support portion and the auxiliary support portion are folded.

Another object of the present invention is to provide a ladder capable of adjusting a height of a tray, in which a space for receiving a tool is provided when an outside support part and an auxiliary support part are separated from each other, and the outside support part and the auxiliary support part are firmly supported.

To achieve the above main object, the present invention provides a ladder with adjustable tray height, comprising: an outer support portion; an inner support part which is provided so as to be drawn out from the inside of the outer support part to the upper part of the outer support part; an auxiliary support part arranged opposite to the outer support part in a state of being separated from the outer support part by a certain interval; a driving part for receiving the power transmitted by the rotating tool to make the inner supporting part ascend or descend; and a plurality of horizontal pedals disposed on the outer support portion. The medial support portion includes: a base plate part for providing a space on which an operator can step; and a tray disposed above the pad portion and providing a space in which work items or tools can be placed.

The pad portion and one end in the longitudinal direction of the tray are rotatably connected to surfaces of the pair of frames that constitute the inner support portion and face each other.

The pad part and the tray are arranged in a horizontal direction in a rotating manner in one direction when the inner supporting part is drawn out from the outer supporting part; the inner support is rotated in the other direction when inserted into the outer support, and is disposed in a direction parallel to the longitudinal direction of the outer support or the inner support.

The pad portion and the tray are disposed between a pair of frames constituting the outer support portion when the inner support portion is inserted into the inner space of the outer support portion.

The upper ends of a pair of frames constituting the auxiliary support portion are rotatably connected to a gear case constituting the driving portion.

And a connecting piece for connecting the auxiliary supporting part and the outer supporting part with a certain interval, wherein one end of the connecting piece in the length direction is connected with the side surface of the gear box, and the other end of the connecting piece in the length direction is connected with the upper end side surface of a framework forming the outer supporting part.

The pad part and the tray are drawn out from or inserted into the upper side support part through a separation space formed between the auxiliary support part and the outer side support part.

The pad part and the tray are inserted into a separation space formed between the auxiliary support part and the outer support part after the inner support part is inserted into the inner space of the outer support part and contacts with the upper surface of the gear box to rotate.

The frame constituting the outer support portion is provided in the form of a rail having a cross section of "Contraband".

The bottom surface of the pad part and the tray is contacted with one inner surface of a framework forming the outer supporting part to limit rotation.

The plurality of horizontal steps are provided outside a frame constituting the outer support portion in order to prevent interference with the movement of the pad portion and the tray.

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

Further comprising: a first link having one end in a longitudinal direction thereof rotatably connected to a frame constituting the outer supporting portion; a second link having one end in a length direction thereof rotatably connected to the other end in the length direction of the first link, and the other end in the length direction thereof rotatably connected to a frame constituting the auxiliary support portion; and a tool box which is arranged along the length direction of the second connecting rod, is connected to the second connecting rod and provides a space for accommodating working objects or tools.

The tool box is configured in a horizontal direction in a space between the outer support part and the auxiliary support part when the auxiliary support part rotates in one direction and the distance between the auxiliary support part and the outer support part is maximum; when the auxiliary support portion is rotated in the other direction and the interval with the outer support portion is narrowed to the maximum, the auxiliary support portion is disposed in a direction parallel to the length direction of the auxiliary support portion or the outer support portion in a space between the outer support portion and the auxiliary support portion.

The side surface of the tool box and one surface of the second connecting rod are in surface contact with each other.

In the tool box, when the auxiliary support portion is rotated in one direction and the distance between the auxiliary support portion and the outer support portion is maximized, the auxiliary support portion is disposed in a space between the outer support portion and the auxiliary support portion in a direction deviated from the direction in which the auxiliary support portion is disposed.

The length of the toolbox in the width direction is shorter than a distance separating a pair of frames constituting the outer supporting portion or a distance separating a pair of frames constituting the auxiliary supporting portion.

The tool box further comprises a cover for opening and closing an opening formed in the tool box, and the cover is detachably arranged on the tool box.

The invention has the beneficial effects that: the ladder with the adjustable tray has the advantages that the pad part for supporting one part of the body of the operator and the tray for placing operation articles or tools are arranged on the inner supporting part led out from the outer supporting part of the tray, so that the ladder provides convenience and safety for the operator;

after the inner supporting part is lifted from the outer supporting part to the extent that the tray is exposed, articles or tools required by operation are stored on the tray in advance, and then the inner supporting part is lifted again, so that an operator does not need to hold weights or tools up and down on the outer supporting part or the inner supporting part, and the operation safety is guaranteed;

a tool box capable of accommodating operation articles or various tools is rotatably arranged in a space formed between the outer side supporting part and the auxiliary supporting part, so that an operator does not need to hold the tool box to walk and operation convenience is provided;

when the outer side supporting part and the auxiliary supporting part are mutually folded, the tool box can not be exposed to the outer sides of the outer side supporting part and the auxiliary supporting part, so that the tool box can be stored in a narrow and small storage place;

when the outside support portion and the auxiliary support portion are unfolded, the toolbox prevents the interval between the outside support portion and the auxiliary support portion from being narrowed by an unintentional horizontal external force while maintaining the interval between the outside support portion and the auxiliary support portion, so that an operator can safely work on the bolster portion.

Drawings

The present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of an adjustable tray height ladder according to one embodiment of the present invention;

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

fig. 3 is a perspective view showing a state where the inside support portion illustrated in fig. 2 is raised on the outside support portion;

fig. 4 is a perspective view showing a state where the inner support portion is lowered toward the outer support portion illustrated in fig. 3;

FIG. 5 is a perspective view showing a state where a safety handle according to an embodiment of the present invention is disposed on a tray;

fig. 6 is a perspective view showing a state where the tool box is provided on the ladder illustrated in fig. 1;

fig. 7 is a perspective view showing a state where the lateral support portion and the auxiliary support portion illustrated in fig. 6 are unfolded at an angle;

fig. 8 is a perspective view showing a state where the lateral support portion and the auxiliary support portion illustrated in fig. 7 are unfolded maximally;

fig. 9 is a perspective view showing a conventional ladder structure for work.

Detailed Description

The following will clearly and completely describe the beneficial effects and features and technical solutions of the present invention in connection with the embodiments of the present invention.

The described embodiments are, however, a few embodiments of the present invention, rather than all embodiments, and are presented for purposes of illustration and description only. All other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of protection of the present invention.

The tray height adjustable ladder of the present invention will be described in detail with reference to fig. 1 to 5. In describing the present invention, related well-known functions or constructions are omitted and detailed description is omitted so as not to obscure the gist of the present invention.

As shown in fig. 1 to 4, an adjustable tray height ladder 100 according to an embodiment of the present invention may include: an outer support portion 110; an inner support part 120 which can be drawn out from the inside of the outer support part 110 to the upper part of the outer support part 110; an auxiliary support part 130 disposed to face the outer support part 110 with a certain interval from the outer support part 110; a driving part 140 for receiving the power transmitted by the rotating tool to lift or lower the inner supporting part 120; and a plurality of horizontal steps 150 disposed on the outer support portion 110.

First, the outer support portion 110 may include a pair of first frames 111 spaced apart from each other at a predetermined interval.

The first frame 111 may be formed in a cross-sectional shape of "Contraband". That is, the first frame 111 is formed by three inner surfaces in cooperation with each other to form an internal space for accommodating or transferring the inner support portion 120, which will be described later, and one side of the first frame is open.

The pair of first frames 111 are arranged facing each other with their inner spaces open.

As described above, the outer support portion 110 is provided with the plurality of horizontal steps 150. The horizontal step 150 provides a space in which the operator can step on the horizontal step with his foot and move up and down along the longitudinal direction of the outer support 110.

The horizontal steps 150 are connected to the pair of first frames 111 at their longitudinal ends, respectively, and are provided in plurality at regular intervals along the longitudinal direction of the first frames 111. At this time, the horizontal step 150 is preferably disposed outside the first frame 111 to prevent interference with the movement of the second frame 121 and the pad part 122 of the inner support part 120 and the tray 123.

The inner support portion 120 may include a pair of second frames 121 spaced apart from each other.

The second frame 121 is formed to have a quadrangular cross section as a whole, and can be accommodated in an internal space formed by the first frame 111 of the outer support 110.

The medial support 120 may include: a pad part 122 for providing a space for an operator to step on or sit down; and a tray 123 disposed above the pad 122 and providing a space in which work items or tools can be placed.

The pad portion 122 is, for example, a honeycomb plate, and may be made of a rigid material that is light and can withstand the load of the operator, and may have a rectangular shape. For example, the pad portion 122 is preferably designed to withstand a load of 130kg or more, and may be designed to have an area larger than the average size of an adult male foot. The upper surface of the pad portion 122 may be provided with a slip prevention member or a plurality of friction projections to prevent the worker from slipping.

The tray 123 is disposed at a position higher than the pad portion 120 as described above, and can provide a space for placing tools or articles required for work.

The tray 123 is not a component for receiving the load of the operator, and therefore, may be designed to receive the load of the work of 20 to 50 kg. The tray 123 may be configured to have a drop-proof frame on the peripheral surface thereof in order to prevent the work or the tool placed thereon from dropping.

The tray 123 is preferably disposed at a position higher than the pad portion 122 so that a worker who steps on the pad portion 122 can easily grip a work object or a tool with a hand.

As described above, the pad part 122 and the tray 123 are connected to each other so that one end in the longitudinal direction can rotate via a hinge pin on the surface facing the pair of second frames 121 constituting the inner supporting part 120.

At this time, as shown in fig. 3, the second frame 121 of the inner support portion 120 is rotated in one direction by its own weight and is disposed in the horizontal direction when being drawn out of the first frame 111 of the outer support portion 110 by the pad portion 122 and the tray 123. For reference, a hinge pin rotatably connecting the pad part 122 and the tray 123 to the second frame 121 may constitute a structure to be rotated in one direction by being connected to a well-known plate spring (not shown). Therefore, the pad part 122 and the tray 123 are exposed to the upper part of the outer support part 110 and then are naturally rotated in one direction and arranged in the horizontal direction.

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

On the other hand, as shown in fig. 4, the second frame 121 of the inner support portion 120 is inserted into the first frame 111 of the outer support portion 110, and then rotated in the other direction to be disposed in a direction parallel to the longitudinal direction of the outer support portion 110, with the pad portion 122 and the tray 123.

As shown in fig. 1 and 2, the outer pad part 122 and the tray 123 are disposed in a space between the pair of first frames 111 that can be inserted into the outer support part 110 after the inner support part 120 and the second frame 121 are safely inserted into the first frames 111 of the outer support part 110.

At this time, the pad portion 122 and the tray 123 accommodated in the space between the pair of first frames 111 are prevented from rotating as the bottom surface contacts the inner surface of the first frame 111 on one side. That is, one inner surface of the first frame 111 may function as a stopper to prevent the pad part 122 and the tray 123 from rotating in the separation space formed by the pair of first frames 111. In other words, the second frame 121 is accommodated in the space shaped like "Contraband" formed by the first frame 111, and then the pad portion 122 and the end portion in the width direction of the tray 123 are partially inserted. Therefore, the pad part 122 and the tray 123 are stopped by the one-side inner surface of the first frame 111 and cannot rotate in the horizontal direction in the separated space formed by the first frame 111.

A safety handle 124 may also be provided on the medial support 120. The safety handle 124 may be disposed at a position higher than the height of the tray 134, and may be provided at the upper ends of the pair of second frames 121 constituting the inner supporting portion 120.

The safety handle 124 is a component that allows an operator to grasp and maintain balance with his or her hand when the operator who performs work by stepping on the horizontal pedal 150 or the pad 122 loses balance.

The safety handle 124 may be disposed on the upper portion of the first frame 111 when the first frame 111 of the outer support portion 110 is received in the second frame 121 of the inner support portion 120. The worker grasps the safety grip 124, pulls the inner support part 120 up on the outer support part 110, or inserts the inner support part 120 into the inner space of the outer support part 110.

Therefore, when the worker does not have the rotary tool, the worker draws out or inserts the inner support portion 120 from or into the inner space of the outer support portion 110 by using the safety handle 124.

The auxiliary support portion 130 is composed of a pair of third frames 131 arranged at a predetermined interval from each other, and can stably support the outer support portion 110 arranged in the inclined direction.

The upper end of the third frame 131 is rotatably connected to a gear case 141 constituting the driving part 140.

The third frame 131 of the subsidiary support portion 130 and the first frame 111 of the outer support portion 110 may connect the connection pieces 132 to each other as a medium.

The coupling piece 132 functions to couple the auxiliary support 130 and the outer support 110 in a state of being separated from each other. That is, one end of the connecting piece 132 in the longitudinal direction may be connected to the side surface of the gear case 141, and the other end thereof in the longitudinal direction may be connected to the upper end side surface of the first frame 111. One side of the coupling piece 132 in the longitudinal direction may be exposed to a power transmission shaft or a well-known gear of the gear case 141 that receives power transmitted by the rotary tool.

According to the structure as described above, the upper ends of the outer supporting part 110 and the auxiliary supporting part 130 may form a separation space through which the pad part 122 and the tray 123 pass. That is, the pad part 122 and the tray 123 are drawn out from the outer support part 110 or inserted into the outer support part 110 through a space formed by separating 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 from each other.

On the other hand, the pad part 122 and the tray 123 are spaces formed by the upper ends of the first frame 111 inserted into the rotation support part 110 and the upper ends of the third frame 131 inserted into the auxiliary support part 130 being separated from each other in the state of rotating as described above, while the bottom part on the other side in the longitudinal direction is rotated in contact with the upper surface of the gear case 141 after the second frame 121 of the inner support part 120 is inserted into the inner space of the first frame 111 of the outer support part 110.

As described above, the driving unit 140 may be a component that receives the power transmitted by the rotary tool and moves the second frame 121, the pad portion 122, and the tray 123 of the inner support portion 120 up or down the outer support portion 110.

The specific structure of the driving unit 140 is described in detail in the registered patent No. 10-1767014 filed by the applicant of the present application, and the detailed structure thereof will not be described in detail in the description of the present invention so as not to obscure the gist of the present invention.

On the other hand, the rotary tool is preferably a known rotary rod in which a groove is formed at the end of the power transmission shaft to be inserted, or an electric screwdriver equipped with a screwdriver bit to be inserted into the groove formed at the end of the power transmission shaft, and is most preferably an electric screwdriver in terms of rapidly raising or lowering the inner support 120.

The operation of the tray height adjustable ladder 100 constructed as described above will be exemplified.

First, the operator rotates the third frame 131 of the auxiliary support 130 to open the gap with the outer support 110. And thus the state in which the outer support 110 is tilted on the inclined ground is maintained as shown in fig. 2.

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

Then, as shown in fig. 3, the second frame 121 of the inner support portion 120 is raised and exposed from the first frame 111 of the outer support portion 110. At this time, the pad part 122 and the tray 123 are rotated in one direction by their own weight to maintain a horizontal state. For reference, the worker puts a work item or a tool on the tray 123 exposed on the outer support 110 in advance and rotated in a horizontal state, and then further raises the inner support 120 on the outer support 110 again using the electric screwdriver. Then, the tray 123 functions as a lifting device, and the operator does not need to hold a heavy work object or tool to the outer support portion 110.

After the inner support portion 120 is completely exposed to the outer support portion 110, the operator can step on the horizontal pedal 150 and the pad portion 122 to perform the work.

After the completion of the work, the operator inserts the electric screwdriver into the end of the power transmission shaft exposed at the coupling piece 132, and turns the electric screwdriver 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 space inside the first frame 111 of the outer support portion 110. At this time, the pad part 122 and the tray 123 are turned in the other direction by contacting the bottom surface of the other longitudinal side thereof to the upper surface of the gear case 141, and then inserted into the space formed between the pair of first frames 111.

Finally, as shown in fig. 1, the operator can rotate the auxiliary support 130 in the direction in which the outer support 110 is disposed. The overall size of the ladder then becomes a convenient storage configuration so that the operator can also place the ladder in a narrow space.

While the specific embodiments of the present invention have been described above, various modifications are possible within the scope of the present invention.

For example, the safety handle 134 may be disposed at the upper end of the second frame 121 constituting the inner support 120 according to an embodiment of the present invention, which is illustrated in the drawings, but is not limited thereto.

For example, as shown in fig. 5, the safety handle 134 may be connected to the tray 133 to be rotatable together with the rotation of the tray 133. At this time, the tray 133 coupled to the safety handle 134 may be rotated by an operator to be inserted into the inner space of the outer support 110. Similarly, the process of arranging the tray 133 exposed to the outside of the outer support 110 in the horizontal direction may be performed by an operator.

The tray height adjustable ladder 100 according to an embodiment of the present invention may further include a tool box 160 disposed between the outer support 110 and the auxiliary support 130, as shown in fig. 6 to 8.

The tool box 160 may be provided with a space for receiving articles or tools required for work, and may be formed in a generally rectangular box shape with an open upper portion.

The tool box 160 is provided between the outer support portion 110 and the auxiliary support portion 130 in a state where one longitudinal end thereof is rotatably connected to a first link L1 of the first frame 111 constituting the outer support portion 110 and the other longitudinal end thereof is rotatably connected to the other longitudinal end of the first link L1 and the other longitudinal end thereof is rotatably connected to a second link L2 of the third frame 131 constituting the auxiliary support portion 130.

The first link L1 has one longitudinal end rotatably connected to the surface of the pair of first frames 111 constituting the outer support portion 110 facing each other, and the other longitudinal end rotatably connected to one longitudinal end of the second link L2 as described above.

As described above, one end of the second link L2 in the longitudinal direction is rotatably connected to the other end of the first link L1 in the longitudinal direction, and further rotatably connected to the outer surface of the tool box 160. The other end of the second link L2 in the longitudinal direction is rotatably connected to the facing surfaces of the pair of second frames 121 constituting the auxiliary support portion 130.

As shown in fig. 8, the tool box 160 is configured such that the auxiliary support portion 130 is rotated in one direction, and after the maximum distance from the outer support portion 110, the tool box is horizontally disposed in the space between the outer support portion 110 and the auxiliary support portion 130.

At this time, the longitudinal other end of the first link L1 pivots in a direction away from the first frame 111 of the outer support portion 110, and the longitudinal one end of the second link L2 pivots in a direction away from the second frame 131 of the subsidiary support portion 130.

As shown in fig. 8, the first link L1 and the second link L2 are horizontally disposed in a space between the outer support 110 and the auxiliary support 130 in a linear form, and maintain the interval between the outer support 110 and the auxiliary support 130, thereby preventing the auxiliary support 130 from being inadvertently rotated on the outer support 110.

When the distance between the outer support 110 and the auxiliary support 130 is maximally extended, it is preferable that a surface of the second link L2 facing the outer surface of the tool box 160 be in contact with the outer surface of the tool box 160 in order to further prevent the distance from being changed by an external force while maintaining the distance between the first link L1 and the second link L2.

That is, in order that the force for rotating the first link L1 or the second link L2 is offset by the self weight of the tool box 160 by the horizontal external force unintentionally transmitted to the outer support 110 or the auxiliary support 130, it is preferable that one surface of the second link L2 and the outer side surface of the tool box 160 are in surface contact with each other.

The self-weight of various articles and tools including the tool box 160 is directly transmitted to the second link L2, and accordingly the first link L1 and the second link L2 are prevented from being rotated by an unintentional external force in the horizontal direction, resulting in narrowing the interval between the outer support 110 and the auxiliary support 130.

As shown in fig. 6, the toolbox 160 is configured such that the auxiliary support portion 130 is rotated in the other direction, and after the interval with the outer support portion 110 becomes the narrowest, the toolbox can be accommodated in the space between the pair of third frames 131 constituting the auxiliary support portion 130 in the state where the space between the outer support portion 110 and the auxiliary support portion 130 is arranged in parallel with the auxiliary support portion 130 or the longitudinal direction of the outer support portion 110.

At this time, the longitudinal other end of the first link L1 rotates in a direction to approach the first frame 111 of the outer support 110, and the longitudinal one end of the second link L2 rotates in a direction to approach the third frame 131 of the subsidiary support 130. Then, as shown in fig. 6, the first link L1 is disposed parallel to the longitudinal direction of the first frame 111, and the second link L2 is disposed parallel to the longitudinal direction of the second frame 121.

After the above state is formed, the outer support 110 and the auxiliary support 130 are folded into a form that is easy for the operator to carry and store.

In particular, when the outer support portion 110 and the auxiliary support portion 130 are folded, the ladder 100 can be stored in a narrow storage space because the tool 160 is disposed in a space between the pair of third frames 131 constituting the auxiliary support portion 130 so as not to be exposed to the outside.

For reference, the width-directional length of the toolbox 160 may be said to be shorter than a separation distance of the pair of first frames 111 constituting the outer support portion 110 or a separation distance of the pair of third frames 131 constituting the subsidiary support portion 130. In other words, when the outer support portion 110 and the auxiliary support portion 130 are folded, if the toolbox 160 is to be accommodated in the separation space between the pair of first frames 111 and the separation space between the pair of third frames 131, the width direction length thereof is naturally designed to be short.

On the other hand, as shown in fig. 8, the tool box 160 is configured such that the auxiliary support 130 is rotated in one direction, and after the interval with the outer support 110 is maximized, the auxiliary support 130 is disposed in a space between the outer support 110 and the auxiliary support 130 in a direction deviated from the arrangement direction of the auxiliary support 130. That is, when the outer support 110 and the auxiliary support 130 are unfolded and the toolbox is disposed 160 in the horizontal direction, the other side portion in the longitudinal direction thereof may be exposed to the outside of the third frame 131 constituting the auxiliary support 130.

As described above, the reason why the toolbox 160 is disposed in a direction offset from the arrangement direction of the auxiliary support 130 is to keep the weight balance between the outer support 110 and the auxiliary support 130. That is, in order to allow the worker who works by stepping on the pad portion 122 to safely work, the load on the auxiliary support portion 130 side is increased and balanced with the load on the outer support portion 110.

In the toolbox 160, the outer support portion 110 and the auxiliary support portion 130 are accommodated in a space formed between the pair of third frames 121 when folded, and a member such as a reinforcing frame cannot be provided between the pair of second frames 121 due to the toolbox 160 disposed in the space. Therefore, when the outer support portion 110 and the auxiliary support portion 130 are expanded, the load of the auxiliary support portion 130 is relatively smaller than the load of the outer support portion 110, and thus the operator cannot keep balance in the pad portion 122. To prevent these phenomena, it is preferable that the tool box 160 be disposed so as to be biased toward the disposition direction of the auxiliary support 130.

On the other hand, an opening formed in the tool box 160 is openable and closable by a lid (not shown). The lid is slidably detachably coupled to the tool box 160 to open or close an open portion of the tool box 160.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; modifications and equivalents of the technical solutions described in the foregoing embodiments may be made by a person skilled in the art without departing from the scope of the technical solutions described in the embodiments of the present invention.

Industrial applicability: the invention is suitable for various industrial fields such as the building field, the coating field and the like.

Claims

1. A ladder with adjustable tray height, comprising:

an outer support portion; an inner support part provided so as to be able to be drawn out from the inside of the outer support part to the upper part of the outer support part; an auxiliary support part arranged opposite to the outer support part in a state of being separated from the outer support part by a certain interval; a driving part for receiving the power transmitted by the rotating tool to make the inner supporting part ascend or descend; and a plurality of horizontal pedals disposed on the outer support portion;

the medial support portion includes: a pad part for providing a space for the operator to step on; and

and a tray disposed above the pad portion and providing a space in which work items or tools can be placed.

2. A ladder with adjustable tray height according to claim 1,

3. A ladder with adjustable tray height as claimed in claim 2,

the pad part and the tray are arranged in a horizontal direction in a rotating manner in one direction when the inner supporting part is drawn out from the outer supporting part;

the inner holder is rotated in the other direction when inserted into the outer holder, and is disposed in a direction parallel to the longitudinal direction of the outer support or the inner support.

4. A ladder with adjustable tray height according to claim 3,

5. A ladder with adjustable tray height according to claim 4,

6. A ladder with adjustable tray height according to claim 5,

further comprising: a connecting piece for connecting the auxiliary supporting part and the outer supporting part with a certain interval;

one end of the connecting sheet in the length direction is connected to the side face of the gear case, and the other end of the connecting sheet in the length direction is connected to the upper end side face of the frame constituting the outer supporting portion.

7. A ladder with adjustable tray height according to claim 6,

the pad part and the tray are drawn out of or inserted into the upper support part on the outer support part through a separation space formed between the auxiliary support part and the outer support part.

8. A ladder with adjustable tray height according to claim 7,

9. A ladder with adjustable tray height according to claim 4,

10. A ladder with adjustable tray height according to claim 9,

11. A ladder with adjustable tray height according to claim 9,

12. A ladder with adjustable tray height according to claim 3,

the inner support part comprises a safety handle;

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

13. A ladder with adjustable tray height according to claim 1,

further comprising: a first link having one end in a longitudinal direction rotatably connected to a frame constituting the outer support portion;

a second link having one end in a length direction rotatably connected to the other end in the length direction of the first link, and the other end in the length direction of the second link rotatably connected to a frame constituting the auxiliary support portion; and

and a tool box which is arranged along the length direction of the second connecting rod, is connected to the second connecting rod and provides a space for accommodating working objects or tools.

14. A ladder with adjustable tray height according to claim 13,

the tool box is configured in a horizontal direction in a space between the outer support part and the auxiliary support part when the auxiliary support part rotates in one direction and the distance between the auxiliary support part and the outer support part is maximum;

when the auxiliary support portion is rotated in the other direction and the interval with the outer support portion is narrowed to the maximum, the auxiliary support portion is disposed in a direction parallel to the length direction of the auxiliary support portion or the outer support portion in a space between the outer support portion and the auxiliary support portion.

15. A ladder with adjustable tray height as claimed in claim 14,

16. A ladder with adjustable tray height as claimed in claim 15,

17. A ladder with adjustable tray height as claimed in claim 16,

18. A ladder with adjustable tray height as claimed in claim 17,

further comprising: a lid for opening and closing an opening formed in the tool box;

the cover is detachably provided on the toolbox.