Ladder

Abstract

Disclosed is a ladder which can prevent the feet of a user from slipping off while improving portability by reducing the volume when the ladder is not in use. The ladder according to the present invention comprises: a pair of vertical frames; a plurality of horizontal frames, both sides of which are fixed to each of the plurality of hollow pipes, which are disposed correspondingly to each other, and which are disposed between the pair of vertical frames at a predetermined interval; the pedal plates are respectively combined with any two of the plurality of horizontal frames so as to form a foot pad plate of the ladder, and the pedal plates are detachably combined with the horizontal frames through combination units.

Description

TECHNICAL FIELD

[0001] The present invention relates to a ladder, and more particularly, to a ladder including a safety step to prevent a user's foot from slipping. BACKGROUND

[0002] Generally, a ladder is used as an auxiliary moving unit when climbing up high or moving to the ground, enabling a user to easily and quickly move between facilities of various forms having a floor height difference.

[0003] A general ladder is a ladder in which a user holds a vertical support with hands and steps a horizontal support with feet, and then repeats the process to move to a desired position, however, in this process, accidents frequently occur in which the vertical support held with hands is loosened or the feet slip from the horizontal support and fall, and thus there is a problem.

[0004] In order to solve this problem, a technology capable of preventing a user's safety accident by providing a guard member that can be installed on a horizontal support of a ladder is disclosed.

[0005] However, the above ladder uses a plurality of fixing members having a velcro or buckle method in order to attach the guard member to the horizontal support of the ladder. In this case, not only does it take considerable work time to attach the guard member to the ladder, but as the user uses the ladder, the fixed fixing members become loose and there is a problem in which they fall from the ladder. Further, the above ladder has a method in which a plurality of fixing members are attached to the back of an integrated guard member, and thus there is also a problem in which when a part of the guard member is damaged, the entire guard member needs to be purchased again.

[0006] On the other hand, a conventional ladder generally maintains a certain length, and thus there is also a problem in which it is inconvenient to carry. For this reason, there is also a need for a ladder that can reduce the volume during carrying and moving, and the necessity of such a ladder is also attracting attention.

[0007] (Prior Art Document)

[0008] (Patent Document 1) Republic of Korea Patent No. 10-2228108 (Published on March 16, 2021) SUMMARY

[0009] TECHNICAL PROBLEM

[0010] In order to solve the above problem, the present invention aims to provide a ladder that reduces the volume when not in use, thereby improving portability.

[0011] In addition, another problem that the present invention aims to solve is to provide a ladder that can prevent a user's foot from slipping.

[0012] In addition, the present application intends to solve another problem in that a ladder can be easily replaced when a part thereof is damaged with use of the ladder.

[0013] Technical Solution

[0014] To achieve the above object, a ladder according to an embodiment of the present application includes a pair of vertical frames including a space therein and continuously connected with a plurality of hollow pipes having different diameters from each other so that the plurality of hollow pipes can be stacked by being overlapped with each other inside; a plurality of horizontal frames fixed to each of the plurality of hollow pipes disposed corresponding to each other and disposed at a predetermined interval between the pair of vertical frames; and a step plate combined with each of any two of the plurality of horizontal frames to constitute a step plate of the ladder, wherein the step plate is detachably combined with the horizontal frames by a combining unit.

[0015] The combining unit includes a plurality of screws combined through the horizontal frames and the step plate.

[0016] The combining unit further includes a reinforcing plate disposed between the head of the screw and the step plate when the screw is combined through the horizontal frames and the step plate.

[0017] The combining unit includes a plurality of magnetic bodies combined with each other by magnetism, the plurality of magnetic bodies being disposed at one side of the horizontal frame and one side of the step plate corresponding to the one side of the horizontal frame.

[0018] The combining unit includes a sliding groove formed at one side of the horizontal frame and a rod member formed at one side of the step plate and slidingly combined in the sliding groove.

[0019] A plurality of magnetic bodies combined with each other by magnetism are disposed at predetermined positions of the sliding groove and the rod member.

[0020] The magnetic bodies are respectively disposed at both ends of the sliding groove and both ends of the rod member so as to prevent the rod member from being separated after the rod member is combined in the sliding groove.

[0021] A plurality of magnetic bodies having different polarities from each other are provided inside the sliding groove, a magnetic body of a first polarity is provided at each of both ends of the sliding groove, a plurality of magnetic bodies of a second polarity different from the first polarity are provided between the magnetic bodies of the first polarity, and a magnetic body of the second polarity is provided at each of both ends of the rod member, so that when the rod member is slidingly coupled in the sliding groove, the magnetic bodies of the second polarity of the sliding groove and the magnetic bodies of the second polarity of the rod member exert repulsive forces on each other inside the sliding groove, thereby improving the mobility of the rod member, and the magnetic bodies of the first polarity of the sliding groove and the magnetic bodies of the second polarity of the rod member exert attractive forces on each other at both ends of the sliding groove, thereby preventing the rod member from being separated.

[0022] The coupling unit includes sliding grooves each formed in the upper and lower sides of the horizontal frame, and a plurality of coupling members formed at both sides of the footrest and slidingly coupled in the sliding grooves, the coupling members including a fixing member inserted into the sliding grooves through both ends of the sliding grooves and slidingly moved along the sliding grooves, a coupling member coupled to one side of the footrest, and a connecting member connecting between the fixing member and the coupling member.

[0023] A plurality of magnetic bodies having magnetism are provided at predetermined positions inside the sliding groove, and the fixing member is provided with a magnetic body provided on the sliding groove and a magnetic body magnetically coupled to each other, so that when the fixing member is positioned at the predetermined positions of the sliding groove provided with the magnetic bodies, the fixing member is prevented from being separated due to the magnetism.

[0024] Inventive Effects

[0025] With the ladder according to an embodiment of the present application, the volume can be reduced when not in use, thereby improving portability.

[0026] With the ladder according to an embodiment of the present application, the footrest is included as a step assisting portion, thereby preventing the feet from slipping when a user uses the ladder.

[0027] With the ladder according to an embodiment of the present application, when a part of the footrest is damaged, it is not necessary to replace all of the plurality of footrests, and the damaged footrest can be replaced, thereby being economical.

[0028] With the ladder according to an embodiment of the present application, a user can easily directly replace the step assisting portion, thereby increasing manufacturing convenience and use convenience.

[0029] In addition, the effects of the present application are not limited to the above-mentioned effects, and can include various effects within the scope that would be obvious to one of ordinary skill in the art through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a perspective view illustrating a state of extending in a height direction in a state where the footboard is not provided on the ladder according to the present application.

[0031] Figure 2 is a perspective view illustrating a state of being stacked by moving in a direction opposite to the height direction in a state where the footboard is not provided on the ladder according to the present application.

[0032] Figure 3 is a perspective view illustrating a state of extending in a height direction in a state where the footboard is provided on the ladder according to the present application.

[0033] Figures 4 to 6 is a view showing an embodiment of the coupling between the footboard and the horizontal frame according to the present application.

[0034] Figure 7 is a view showing another embodiment of the coupling between the footboard and the horizontal frame according to the present application.

[0035] Figures 8 to 11 is a view showing still another embodiment of the coupling between the footboard and the horizontal frame according to the present application.

[0036] Figure 12a , Figure 12b and Figure 12c are views showing other embodiments of the sliding groove formed on the horizontal frame according to the present application.

[0037] Figures 13 to 15 is a view showing still another embodiment of the coupling between the footboard and the horizontal frame according to the present application.

[0038] Figure 16 and Figure 17 are views showing still another embodiment of the coupling between the footboard and the horizontal frame according to the present application.

[0039] Figure 18 is an embodiment of the footboard according to the present application.

[0040] Figure 19 and Figure 20 are views showing the covering member according to the present application. DETAILED DESCRIPTION

[0041] Hereinafter, some embodiments of the present application will be explained in detail through exemplary drawings. In attaching reference numerals to constituent elements of each drawing, it should be noted that the same reference numerals should have the same symbols as much as possible even if they are marked on other drawings.

[0042] Then, when it is judged that a specific description of a related known structure or function hinders the understanding of the embodiments of the present application, a detailed description thereof is omitted in explaining the embodiments of the present application.

[0043] In addition, in explaining the constituent elements of the embodiments of the present application, the terms of first, second, A, B, (a), (b), and the like can be used. Such terms are only used to distinguish the constituent elements from other constituent elements, and do not limit the nature or order or sequence of the constituent elements by the terms.

[0044] In the present specification, the singular form also includes the plural form unless specifically mentioned in the article. "Include" and / or "including" used in the specification means that one or more other constituent elements exist or are added, in addition to the mentioned constituent elements, and does not exclude the existence or addition of one or more other constituent elements.

[0045] In the drawings, the X direction refers to the direction toward the user in the ladder, the Y direction refers to the length direction forming the horizontal frame 100, and the Z direction refers to the direction toward the height of the ladder.

[0046] Hereinafter, the present application will be further explained in detail with reference to the accompanying drawings.

[0047] Figure 1 is a perspective view illustrating a state of extending in the height direction in a state in which the footboard 400 is not provided on the ladder according to the present application, Figure 2 is a perspective view illustrating a state of being stacked by moving in the direction opposite to the height direction in a state in which the footboard 400 is not provided on the ladder according to the present application. Then, Figure 3 is a perspective view illustrating a state of extending in the height direction in a state in which the footboard 400 is provided on the ladder according to the present application.

[0048] Referring to Figure 1 and Figure 3 , the ladder according to the present application includes a pair of vertical frames 200, 300, a plurality of horizontal frames 100, and a footboard 400.

[0049] A pair of vertical frames 200, 300 includes a right vertical frame 200 and a left vertical frame 300. The pair of vertical frames 200, 300 internally contains a space, and a plurality of hollow tubes having different diameters from each other are continuously connected, so that the plurality of hollow tubes can be stacked by being overlapped with each other inwardly. In this case, in order to stack the plurality of hollow tubes by being overlapped with each other inwardly, each hollow tube and a lower end hollow tube connected with the hollow tube can be independently inserted. However, in the case of independent insertion, when the overall length of the ladder is minimized, a plurality of insertion works are required. In the present invention, in order to improve convenience, a separate protruding clamp provided at the lower side of the lowermost horizontal frame can be used. Specifically, it can be configured that when the separate protruding clamp is pressed, each hollow tube is inserted into a lower end hollow tube connected with the hollow tube in a domino manner. The manner of implementing the domino manner is not limited, as long as it is configured in a manner that a person skilled in the art stacks adjacent horizontal frames with each other at one time.

[0050] As an embodiment, the pair of vertical frames 200, 300 can each be made of a light and strong material. The pair of vertical frames 200, 300 are each composed of a plurality of hollow tubes having different diameters. For example, the hollow tube constituting the lowermost end of each vertical frame 200, 300 can have the largest diameter. The other hollow tubes can be inserted into the inside of the largest diameter hollow tube constituting the lowermost end, thereby being sequentially pulled out and continuously connected, so that the length is shortened or lengthened. At this time, it can be configured that the hollow tubes each located inwardly are not more than the length of the hollow tubes into which they are inserted. A cradle portion 10 contacting the ground is formed at the lower end of the vertical frame 200, 300, and the cradle portion 10 is made of rubber or synthetic resin material having a large friction coefficient, so that the ladder is not easily slipped down when it is erected against the ground.

[0051] A hook portion 20 in the shape of a ring can also be formed at the upper end of the vertical frame 200, 300 to enable the ladder to be hung at a specific place.

[0052] The plurality of horizontal frames 100 are fixed to each of the plurality of hollow tubes provided corresponding to each other, and are provided at a predetermined interval between the stack of vertical frames 200, 300. Ridges and grooves can be formed on the upper surface of the plurality of horizontal frames 100 to prevent the user from slipping.

[0053] A fixing unit (not shown) can be provided in at least one of the plurality of horizontal frames 100, and in a state in which the pair of vertical frames 200, 300 are extended in the height direction (z-axis direction) to be unfolded, the fixing unit fixes the hollow tubes in respective positions to prevent the respective hollow tubes from being stacked by being overlapped inside. The fixing unit can be configured of a locking pin (not shown) provided to be movable inside the horizontal frame 100 toward the vertical frames 200, 300, and a lever (not shown) that moves the locking pin. The locking pin is moved to and from a connection portion of the horizontal frame 100 and the vertical frames 200, 300 by operating the lever. When the locking pin is moved inside the horizontal frame 100 toward the vertical frames 200, 300, the hollow tubes are prevented from being moved to prevent the vertical frames 200, 300 from being extended or stacked by being overlapped inside. The lever is configured to protrude to the outside direction from one side of the horizontal frame 100, and can be disposed at an appropriate position according to the convenience of use of a user. For example, the lever can also be disposed to protrude from the lower side of the horizontal frame 100, or can also be disposed to protrude from one side of the horizontal frame 100 toward the direction of the user. The user can move the locking pin backward by pressing the lever to allow the hollow tubes fixed in predetermined positions to be freely moved, thereby being able to adjust the length of the ladder.

[0054] The footboard 400 is coupled to each of any two of the plurality of horizontal frames 100 to constitute a footboard of the ladder together with the horizontal frames 100. Specifically, the footboard 400 is coupled to each of two horizontal frames 100 adjacent to each other at both ends thereof to constitute a footboard of the ladder. The footboard 400 prevents the feet of a user using the ladder from slipping. The footboard 400 can be coupled to be easily detachable from the horizontal frames 100. The footboard 400 is configured to be coupled to the horizontal frames 100 to be easily detachable by the coupling units included in the plurality of embodiments, so that when a part of the footboard 400 is broken, it is not necessary to replace all of the plurality of footboards 400, and it is possible to replace only the broken footboard 400, and in addition, it is possible to allow the user to easily directly replace the footboard 400.

[0055] The footboard 400 can be configured of a material having flexibility. For example, the footboard 400 can be configured of a cloth or a synthetic material (cotton, nylon, or polyester) material. In some examples, the footboard 400 can also be configured of a light and strong material (for example, a tear-resistant nylon fabric, a cube fiber, or polyethylene). The footboard 400 can be bent to have a predetermined angle in the vicinity of the center after being coupled to each of two horizontal frames 100 adjacent to each other.

[0056] A reflective plate (not shown) in the form of a thin strip can be further adhered to at least one end of the footboard 400 along the one end. The reflective plate is preferably made of a fluorescent material that emits light in the dark, but is not limited to a fluorescent material as long as the material is visible in the dark. Even if the ladder is used in a dark environment, the risk of the user stepping on nothing can be reduced due to the reflective plate.

[0057] Figures 4 to 6 FIG. 1 is a view showing an embodiment of the coupling between the footboard 400 and the horizontal frame 100 according to the present application.

[0058] Referring to Figure 4 and Figure 5 , the footboard 400 and the horizontal frame 100 according to the present application are coupled to be detachable by a coupling unit including a plurality of screws 101. At this time, the plurality of screws 101 are each coupled through the horizontal frame 100 and the footboard 400. The plurality of screws 101 can each be coupled to a side of the horizontal frame 100 in a direction (x-axis) facing the user. The plurality of screws 101 each couple one end of the footboard 400 to the side of the horizontal frame 100. The plurality of screws 101 couple the footboard 400 and the horizontal frame 100 to each other on a side surface of the horizontal frame 100 facing the user. When any one of the plurality of footboards 400 is damaged, the user can replace the new footboard 400 after detaching the screws 101 of the horizontal frame 100 to which the footboard 400 is coupled.

[0059] Referring to Figure 6 , the coupling unit coupling the footboard 400 and the horizontal frame 100 according to the present application further includes a reinforcing plate 103 disposed between the head of the screw 101 and the footboard 400 when the screw 101 is coupled through the horizontal frame 100 and the footboard 400. By the reinforcing plate 103, the coupling strength between the screw 101 and the horizontal frame 100 can be further improved, and thus the coupling strength between the footboard 400 and the horizontal frame 100 can be further improved.

[0060] At this time, as shown in Figure 6 , the reinforcing plate 103 can be included only on the horizontal frame 100 located on the lower side, but is not limited thereto, and according to an embodiment, can be disposed on the horizontal frame 100 located on the upper side. In addition, the positions at which the plurality of screws 101 included in the coupling unit are coupled to the horizontal frame 100 include not only the side surface of the horizontal frame 100 facing the user as shown in Figure 5 , but also the upper end surface of the horizontal frame 100 as shown in Figure 6 . In addition, the footboard 400 and the horizontal frame 100 can be coupled to each other by the plurality of screws 101 on the side surface of the horizontal frame 100 facing the user and on the upper end surface of the horizontal frame 100, respectively.

[0061] Figure 7 This is a diagram illustrating another embodiment of the combination between the foot pedal 400 and the horizontal frame 100 according to the present invention.

[0062] like Figure 7 As shown, the connecting unit that detachably connects the horizontal frame 100 and the foot pedal 400 may include a pair of magnets 105, 107 each disposed in corresponding positions. Figure 7 As shown, the pair of magnetic bodies 105, 107 can be coupled on the side of the horizontal frame 100 facing the user, thereby attaching the foot pedal 400 to the horizontal frame 100. The pair of magnetic bodies 105, 107 can be multiple, spaced apart at predetermined intervals on one side of the horizontal frame 100, thereby being coupled to one side of the horizontal frame 100.

[0063] A pair of magnetic bodies 105 and 107, each with different polarities, are respectively disposed on the horizontal frame 100 and the foot pedal 400. That is, multiple magnetic bodies 105 and 107 can be arranged on one side of the horizontal frame 100 and on one side of the foot pedal 400 corresponding to one side of the horizontal frame 100. However, this is not a limitation. As mentioned above, a magnetic body 105 can be disposed on one side of the foot pedal 400, and a metal body 107 capable of exerting an attractive force with the magnetic body 105 can be disposed on one side of the horizontal frame 100, thereby magnetically connecting the foot pedal 400 and the horizontal frame 100.

[0064] Figures 8 to 11 This is a diagram illustrating yet another embodiment of the combination between the foot pedal 400 and the horizontal frame 100 according to the present invention. Then, Figure 12a , Figure 12b and Figure 12c This is a diagram illustrating another embodiment of a sliding groove 110 formed on a horizontal frame 100 according to the invention.

[0065] refer to Figures 8 to 11 The connecting unit that detachably connects the foot pedal 400 and the horizontal frame 100 according to the invention includes a sliding groove 110 and a rod member 410. The sliding groove 110 is formed on one side of the horizontal frame 100.

[0066] Each of the lever components 410 is formed on both sides of the foot pedal 400, specifically one end and the other end in the longitudinal direction. The lever component 410 formed on one end of the foot pedal 400 and the lever component 410 formed on the other end can be combined with the sliding groove 110 formed on one side of either horizontal frame 100 and the sliding groove 110 formed on one side of the other horizontal frame 100.

[0067] The rod part 410 can have a cylindrical shape with an inner portion that is hard, and an outer portion that surrounds one end of the footrest 400. The outer diameter of the rod part 410 can be formed to be slightly smaller than the inner diameter of the sliding groove 110. The rod part 410 slides inside the sliding groove 110 after being inserted into the sliding groove 110, thereby being able to move in the length direction (y-axis direction) of the horizontal frame 100. One end of the rod part 410 is able to move in the length direction of the horizontal frame 100 inside the sliding groove 110 after being inserted into one end of the sliding groove 110.

[0068] The sliding groove 110 is formed on one side of the horizontal frame 100, in which a sliding groove 110 that shares the coupling of the horizontal frame 100 and the footrest 400 located on the lower side and a sliding groove 110 that shares the coupling of the horizontal frame 100 and the footrest 400 located on the upper side are respectively formed. That is, a pair of sliding grooves 110 can be formed on one side of the horizontal frame 100.

[0069] However, it is not limited thereto, and the sliding groove 110 formed on the horizontal frame 100 can also be a pair of sliding grooves 110 formed on one side surface in the direction toward the user as shown in FIG. 2A, or a pair of sliding grooves 110 formed on one side surface in the direction opposite to the direction toward the user as shown in FIG. 2B, or a sliding groove 110 formed on one side surface in the direction toward the user and a sliding groove 110 formed on one side surface in the direction opposite to the direction toward the user as shown in FIG. 2C. Figure 12a Figure 12b Figure 12c

[0070] Figures 13 to 15 is a view showing another embodiment of the coupling between the footrest 400 and the horizontal frame 100 according to the present application.

[0071] Referring to FIG. 1, Figure 13 ​​​As an embodiment of the coupling unit according to the present application, a plurality of magnetic bodies 111, 411 which are coupled to each other by magnetism can be provided at predetermined positions of the sliding groove 110 and the rod member 410. Specifically, the plurality of magnetic bodies 111, 411 can be provided at both ends of the sliding groove 110 and both ends of the rod member 410, respectively. After one end of the rod member 410 is inserted into the inside of the sliding groove 110, the rod member 410 is moved in the opposite direction of the sliding groove 110 by sliding along the sliding groove 110, and thus the rod member 410 is positioned at a proper predetermined position. At this time, the magnetic bodies 411 provided at both ends of the rod member 410 and the magnetic bodies 111 provided at both ends of the sliding groove 110, respectively, are attracted to each other by magnetism, and thus the rod member 410 can be prevented from being separated. That is, the magnetic bodies 111 provided at both ends of the sliding groove 110 and the magnetic bodies 411 provided at both ends of the rod member 410 are attracted to each other by magnetism, and thus the footrest 400 can be prevented from being moved from the normal position due to the use of the user. When the footrest 400 is separated from the normal position, even if the footrest 400 exists, a problem in which the user's foot can slip off can occur. By the magnetic bodies 111, 411 provided at the sliding groove 110 and the rod member 410, the movement of the rod member 410, and more specifically, the footrest 400, is prevented. The magnetic bodies 111, 411 provided at the sliding groove 110 and the rod member 410 function as stoppers which prevent the movement of the footrest 400 from each other.

[0072] Referring to Figure 14 As another embodiment of the coupling unit according to the present application, a plurality of magnetic bodies 111, 113 having different polarities from each other can be provided at the inside of the sliding groove 110. For example, when the magnetic bodies 111 provided at both ends of the sliding groove 110, respectively, have a first polarity, a plurality of magnetic bodies 113 having a second polarity can be provided between the magnetic bodies 111 having the first polarity of the sliding groove 110. Here, the second polarity refers to a polarity opposite to the first polarity. For example, when the first polarity is an N-pole, the second polarity can be an S-pole, and when the first polarity is an S-pole, the second polarity can be an N-pole.

[0073] The magnetic bodies 411 having the second polarity are provided at both ends of the rod member 410, and thus, as described with reference to Figure 13 when both ends of the rod member 410 are positioned on both ends of the sliding groove 110, the rod member 410 is prevented from being moved by the attraction of the respective magnetic bodies 111, 411. On the other hand, as a plurality of magnetic bodies 113 having the second polarity are provided between the magnetic bodies 111 having the first polarity of the sliding groove 110 when the rod member 410 is coupled by sliding after being inserted into the sliding groove 110, with reference to Figure 15The magnetic body 113 of the second polarity of the sliding groove 110 and the magnetic body 411 of the second polarity of the rod member 410 exert repulsive force to each other inside the sliding groove 110, thereby further improving the mobility of the rod member 410 inside the sliding groove 110. Thus, as the magnetic body 113 provided inside the sliding groove 110 and the magnetic body 411 provided on both ends of the rod member 410 have the same polarity as each other, the rod member 410, and more specifically the footrest 400, can be more easily moved and coupled.

[0074] Figure 16 and Figure 17 FIG. 10 is a view showing another embodiment of the coupling between the footrest 400 and the horizontal frame 100 according to the present application.

[0075] Referring to Figure 16 and Figure 17 The coupling unit for detachably coupling the footrest 400 and the horizontal frame 100 includes the sliding grooves 110 each formed in the upper and lower sides of the horizontal frame 100, and the coupling member 420 formed in both sides of the footrest 400. After the coupling member 420 is inserted into the sliding grooves 110, it is coupled by sliding along the inside of the sliding grooves 110. A plurality of coupling members 420 are provided on both ends of the footrest 400.

[0076] The coupling member 420 includes the fixing member 421, the coupling member 425, and the connecting member 423. The fixing member 421 is inserted into the inside of the sliding groove 110 through both ends of the sliding groove 110 and moves by sliding along the sliding groove 110. The coupling member 425 is coupled to both sides of the footrest 400. The connecting member 423 connects between the fixing member 421 and the coupling member 425.

[0077] A plurality of fixing members 421 are each inserted into the sliding groove 110 and then moved, thereby enabling the footrest 400 and the horizontal frame 100 to be detachably coupled. According to an embodiment, a plurality of fixing members 421 each separated are inserted into the sliding groove 110 and coupled, thereby enabling the footrest 400 to be more easily coupled to the horizontal frame 100 than by the coupling of the rod member 410 described above.

[0078] At this time, a plurality of magnetic bodies 111 can be provided in the sliding groove 110. At this time, the plurality of magnetic bodies 111 can each be provided at a predetermined position where the fixing member 421 is located. Alternatively, each of the fixing members 421 can include a magnetic body that exerts attractive force to the magnetic body 111 provided in the sliding groove 110. Or, the fixing member 421 itself can be formed of a magnetic body 421.

[0079] Therefore, when the fixing members 421 each correspond to a predetermined position where the magnetic body 111 is provided in the sliding groove 110, the fixing members 421 can be prevented from being separated from the predetermined position by the attractive force of each magnetic body 111, 421, i.e., by magnetism.

[0080] Figure 18 is an embodiment of the footrest 400 according to the present application.

[0081] As an embodiment of the footrest 400, a side surface part 401 that closes both side surfaces can be further included. According to an embodiment, as the side surface part 401 is further included, the user's foot can be prevented from sliding toward the side surface of the ladder. The side surface part 401 can be formed of the same material as the footrest 400, and not only that, can be formed of a more flexible polymer material than the footrest 400, so that the form of the side surface part 401 can be easily changed when the plurality of hollow pipes in the vertical frame are overlapped.

[0082] Figure 19 and Figure 20 is a view illustrating a covering part according to the present application.

[0083] The ladder according to the present application can have a small volume when not in use, thereby improving portability. Referring to Figure 19 , the outside of the ladder can be protected by a covering part 500 in a state where the hollow pipes of the vertical frames 200, 300 of the ladder are each overlapped and stacked inside. As an embodiment, the covering part 500 can cover the upper part, the back part, and the lower part of the ladder in the overlapped state. The upper part 510 of the covering part is coupled to the upper part of the ladder, and the lower part 501 of the covering part is positioned outside the bracket part 10 of the ladder, thereby protecting the bracket part 10. The upper part 510 of the covering part can further include a fixing unit 513 such as a Velcro or the like for fixing around the upper part of the ladder after being coupled to the upper part of the ladder.

[0084] The material of the covering part is not particularly limited, and can be a flexible material or a plastic material without flexibility. When it is a flexible material, the covering part can be rolled up and attached to the back upper part of the ladder in a case where the ladder is unfolded for use.

[0085] As an embodiment, referring to Figure 20 , the upper part of the covering part can be coupled to the upper part of the ladder.

[0086] A rod member 511 of the covering member 500 can be inserted into the slide groove 110 of the horizontal frame 100 at the upper portion 510 of the covering member 500. In particular, the rod member 511 of the covering member 500 can be combined with the slide groove 110 provided on the horizontal frame 100 located at the uppermost end among the plurality of horizontal frames 100. In addition, the rod member 511 of the covering member 500 can be inserted into and combined with the slide groove 110 provided on the uppermost horizontal frame 100 in the slide grooves 110 provided on the upper and lower horizontal frames 100, respectively.

[0087] The upper slide groove 110 of the horizontal frame 100 located at the uppermost end is not combined with the rod member 410 of the footrest 400. Accordingly, the covering member 500 is combined with the ladder through the upper slide groove 110 of the horizontal frame 100 located at the uppermost end, which is not combined with the rod member 410 of the footrest 400, thereby protecting the ladder.

[0088] In the present specification, a "unit" includes a unit implemented by hardware, a unit implemented by software, and a unit implemented by both. In addition, one unit can be implemented by two or more hardware, and two or more units can be implemented by one hardware.

[0089] The scope of protection of the present application is not limited to the recitations and descriptions of the embodiments explicitly shown and described above. In addition, it is again clarified that the scope of protection of the present application is not limited to the modifications or substitutions obvious in the technical field to which the present application pertains.

Claims

1. A ladder comprising: a pair of vertical frames; a plurality of horizontal frames disposed at predetermined intervals between the pair of vertical frames; and a footstep combined with each of any two of the plurality of horizontal frames to constitute a mat step of the ladder, wherein the footstep is detachably combined with the horizontal frame through a combination unit, the pair of vertical frames are configured to contain a space inside and are continuously connected with a plurality of hollow tubes having different diameters from each other, so that the plurality of hollow tubes can be stacked by being overlapped with each other inside.

2. The ladder according to claim 1, wherein the combination unit comprises a plurality of screws combined through the horizontal frame and the footstep.

3. The ladder according to claim 2, wherein the combination unit further comprises: a reinforcing plate disposed between the head of the screw and the footstep when the screw is combined through the horizontal frame and the footstep.

4. The ladder according to claim 1, wherein the combination unit comprises a plurality of magnetic bodies combined with each other by magnetism, the plurality of magnetic bodies are disposed at one side of the horizontal frame and one side of the footstep corresponding to the one side of the horizontal frame.

5. The ladder according to claim 1, wherein the combination unit comprises: a sliding groove formed at one side of the horizontal frame; and a rod member formed at one side of the footstep and slidingly combined in the sliding groove.

6. The ladder according to claim 5, wherein a plurality of magnetic bodies combined with each other by magnetism are disposed at predetermined positions of the sliding groove and the rod member.

7. The ladder according to claim 6, wherein the magnetic bodies are respectively disposed at both ends of the sliding groove and both ends of the rod member, so that the rod member is prevented from being separated after being combined in the sliding groove.

8. The ladder according to claim 5, wherein a plurality of magnetic bodies having different polarities from each other are disposed at the inside of the sliding groove, a magnetic body of a first polarity is respectively disposed at both ends of the sliding groove, a plurality of magnetic bodies of a second polarity different from the first polarity are disposed between the magnetic bodies of the first polarity, a magnetic body of the second polarity is respectively disposed at both ends of the rod member, when the rod member is slidingly combined in the sliding groove, the magnetic body of the second polarity of the sliding groove and the magnetic body of the second polarity of the rod member exert repulsive force to each other inside the sliding groove, so that the mobility of the rod member is improved, the magnetic body of the first polarity of the sliding groove and the magnetic body of the second polarity of the rod member exert attractive force to each other at both ends of the sliding groove, so that the rod member is prevented from being separated.

9. The ladder according to claim 1, wherein the combination unit comprises: a sliding groove respectively formed at the upper side and the lower side of the horizontal frame; and a plurality of combination members formed at both sides of the footstep and slidingly combined in the sliding groove, the combination member comprises: ​ a fixing member inserted into the sliding groove through both ends thereof and slidably moved along the sliding groove; a coupling member coupled to one side of the footrest; and a connecting member connecting between the fixing member and the coupling member.

10. The ladder according to claim 8, wherein a plurality of magnetic bodies having magnetism are provided at predetermined positions on the inner side of the sliding groove, the fixing member is provided with magnetic bodies provided on the sliding groove and magnetic bodies magnetically coupled to each other, so that the fixing member is prevented from being separated due to the magnetism when the fixing member is positioned at the predetermined positions of the sliding groove provided with the magnetic bodies.

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