Mobile ladder
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-02-04
- Publication Date
- 2026-08-13
Smart Images
Figure KR2025099253_13082026_PF_FP_ABST
Abstract
Description
portable ladder
[0001] The disclosed content relates to a ladder that allows a worker to step on it and climb up to a high place to work.
[0002] Unless otherwise indicated in this specification, the contents described in this section are not prior art for the claims of this application, and are not to be recognized as prior art simply because they are included in this section.
[0003]
[0004] Generally, for work at heights, a ladder is required to allow the worker to step onto it and climb up to work.
[0005] Types of such ladders include the H-type ladder, commonly referred to as a straight ladder; the A-type ladder, commonly used for home or general use; the step ladder, mainly used at wallpapering sites; the fruit tree ladder, specialized for managing fruit trees or gardens; the step ladder, which has a work platform combined similarly to stairs; and the LS-type ladder, a multi-purpose ladder most commonly used at work sites.
[0006] As an example of such a ladder, Korean Utility Model Registration Publication No. 20-0412244 (published on March 23, 2006) discloses a ladder comprising: a top plate that folds by a hinge; a pair of supports fixed to each end of the top plate and having multiple insertion holes formed on their sides; and a ladder body having multiple footrests connecting the supports; an auxiliary leg comprising a vertical bar that wraps around the outer side of the supports and has a through hole formed on the upper outer side, and multiple horizontal bars connecting the vertical bars, which slides along the outer side of the supports to adjust the height; and a fixing means fixed to the auxiliary leg, which penetrates the through hole of the vertical bar and is selectively inserted into the insertion hole of the support to fix the position of the auxiliary leg.
[0007] In addition, Korean Patent Publication No. 10-2015-0019529 (published on February 25, 2015) discloses a variable ladder characterized by comprising, in an A-type ladder in which a first ladder part and a second ladder part capable of length adjustment are hinge-connected at the top, a first connecting member hinge-connected to both sides of the bottom of the first ladder part, a second connecting member hinge-connected to both sides of the bottom of the second ladder part, a length extension means that can be drawn out from the interior of each first connecting member to extend the length, and a coupling means that connects the length extension means of the first connecting member and the second connecting member by means of a latch formed on the inside from one end of each second connecting member.
[0008] In the case of conventional ladders as described above, they are often improved in the form of adding a two-stage length adjustment configuration to increase ease of use or safety, adding safety devices such as anti-tipping devices, installing tool boxes, adding anti-slip configurations, or adding reinforcing structures.
[0009] We aim to provide a portable ladder that can be moved quickly and easily to another location, thereby increasing ease of use and improving work efficiency.
[0010] In addition, we intend to provide a mobile ladder that can be moved with work-necessary items loaded on top of the ladder body, thereby further improving work efficiency.
[0011] Furthermore, it is evident that the technical challenges are not limited to those described above, and that other technical challenges may be derived from the following description.
[0012] The disclosed content presents, as an embodiment, a movable ladder comprising a movable carriage, guide rails provided on both longitudinal sides of the movable carriage, and a ladder body having a lower end rotatably hinged to the movable carriage, a lower end movably connected to the guide rail, and a central part rotatably hinged.
[0013] According to a preferred feature of the disclosed content, the movable cart may include a square frame, a movable wheel fixed to the lower side of the square frame, and a loading platform installed on the square frame.
[0014] According to a more preferred feature of the disclosed content, the movable carriage may further include a foot brake mechanism provided on one side of the square frame.
[0015] According to a more preferred feature of the disclosed content, the movable carriage may further include anti-tipping outrigger mechanisms provided on the front and rear sides of the square frame.
[0016] According to a preferred feature of the disclosed content, the guide rail may have a channel shape or a slide rail shape in which opposing surfaces facing each other are open.
[0017] According to a preferred feature of the disclosed content, the ladder body may be an LS-type ladder comprising a first H-shaped ladder part whose lower end is rotatably hinged to the movable carriage, a second H-shaped ladder part whose lower end is movably connected to the guide rail, and an A-shaped ladder part whose central part is rotatably hinged and whose two sides are connected to the first and second H-shaped ladder parts so as to move relative to each other in the up and down direction to enable overall height adjustment.
[0018] According to a preferred feature of the disclosed content, the ladder body may further include a height adjustment means for raising and lowering the A-shaped ladder section with respect to the first and second H-shaped ladder sections.
[0019] According to the mobile ladder described above, since the height-adjustable ladder body is installed on a mobile cart including a moving wheel, it can be moved quickly and easily to another location, thereby increasing convenience of use and simultaneously improving the efficiency of high-altitude work using the ladder body.
[0020] In addition, the mobile ladder described above has the advantage of further improving work efficiency because, as a loading platform is provided on the mobile cart, it can be moved with items necessary for the work loaded in addition to the ladder body.
[0021] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by a person skilled in the art from the description in the claims.
[0022] FIG. 1 is a perspective view of a movable ladder according to one embodiment of the disclosed content.
[0023] FIG. 2 is an exploded perspective view of a movable ladder according to one embodiment of the disclosed content.
[0024] FIG. 3 is a height adjustment operation diagram of a movable ladder according to one embodiment of the disclosed content.
[0025] FIG. 4 is a diagram showing the usage state of a movable ladder according to one embodiment of the disclosed content.
[0026] Hereinafter, the configuration and effects of a preferred embodiment will be examined with reference to the attached drawings. For reference, in the drawings below, each component is omitted or schematically depicted for convenience and clarity, and the size of each component does not reflect its actual size. Furthermore, throughout the specification, the same reference numerals refer to the same components, and reference numerals for the same configuration in individual drawings will be omitted.
[0027]
[0028] A movable ladder (1) according to one embodiment of the disclosed content includes a movable carriage (10), a guide rail (20), and a ladder body (30) as shown in FIG. 1.
[0029] Here, the movable cart (10) enables the rapid and easy movement of a movable ladder (1) according to one embodiment of the disclosed content, and includes a square frame (11) as shown in FIG. 2 and a movable wheel (12) fixed to the lower part of the square frame (11).
[0030] The square frame (11) can be formed as a rectangular shape that extends long in the left and right directions to allow mounting and height adjustment of the ladder body (30) to be described later, and depending on the embodiment, reinforcing frame members may be arranged in the front and rear directions.
[0031] The moving wheel (12) enables rolling movement of the moving carriage (10), and it is preferable that a number of them be installed on the lower part of the square frame (11). In addition, the moving wheel (12) is preferably formed as a conventional caster wheel that allows for free turning, and a stopper mechanism for a caster wheel of a known structure for stopping rolling movement may be added to such moving wheel (12).
[0032] In addition, it is preferable to install a goods loading platform (13) on the square frame (11) of the movable cart (10). The goods loading platform (13) corresponds to a loading plate on which various items necessary for high-altitude work are loaded in addition to the ladder body, and can be fixed on the square frame (11) by various methods such as welding or bolt fastening.
[0033] In addition, the movable cart (10) may be formed in a structure in which a loading platform (13) is installed on a square frame (11) on which a moving wheel (12) is installed, in addition to a structure in which the square frame (11) itself is formed in the shape of a square plate such as a loading plate and a moving wheel (12) is installed on its lower surface.
[0034] Additionally, a foot brake mechanism (14) may be additionally considered on one side of the square frame of the movable cart (10). The foot brake mechanism (14) is configured such that when a worker steps on the braking plate (14a) with their foot, the brake pad (14b) is fixed in contact with the ground, thereby forcing movement by the moving wheel (12) to be impossible, and when a worker steps on the brake release plate (14c) with their foot, the brake pad is fixed so that it is spaced upward from the ground, thereby enabling movement by the moving wheel (12).
[0035] The configuration and operating structure of such a foot brake mechanism (14) are already known as Korean Utility Model Registration No. 20-0264731, etc., so further detailed description is omitted here for the sake of simplification of the specification.
[0036] Additionally, an anti-tipping outrigger mechanism (15) may be provided on the front and rear sides of the square frame (11) of the movable cart (10). The anti-tipping outrigger mechanism (15) serves to prevent the movable ladder according to the disclosed embodiment from tipping forward, backward, left, and right, taking into account that the center of gravity of the movable ladder according to the disclosed embodiment shifts upward during high-altitude work by a worker using the ladder body (30) to be described later.
[0037] Preferably, such an anti-tipping outrigger mechanism (15) includes a horizontal extension member (15a) that protrudes and extends from the front and rear sides of the square frame (11) of the movable carriage (10), and a vertical grounding member (15b) that is installed to be movable up and down at the outer end of the horizontal extension member (15a). At this time, it is preferable that the horizontal extension member (15a) is installed to be rotatable on the front and rear sides of the square frame (11) of the movable carriage (10), and it is preferable that the vertical grounding member (15b) includes a threaded rod that is connected through the outer end of the horizontal extension member (15a).
[0038] Guide rails (20) are provided on both longitudinal sides of the aforementioned movable carriage (10). The guide rails (20) serve to guide the sliding movement of the lower end of the ladder body (30) when adjusting the height of the ladder body (30) to be described later.
[0039] It is preferable that such guide rails (20) have a channel shape in which the opposing surfaces facing each other are open. At this time, one end in the longitudinal direction of the guide rail (20) may be closed to prevent the lower end of the ladder body (30) from being accidentally dislodged, and the other end in the longitudinal direction of the guide rail (20) may be open to allow separation of the lower end of the ladder body (30). Additionally, at least one of the upper and lower surfaces of the opposing ends of the guide rail (20) may be formed to be recessed inward.
[0040] In addition, the guide rail (20) may have the shape of a conventional slide rail, although it is not shown.
[0041] Guide rails (20) can be fixed to both sides of the movable carriage (10) in the longitudinal direction by various methods such as welding, bolt fastening, etc.
[0042] A ladder body (30) is installed on the aforementioned movable cart (10). This ladder body (30) enables a worker to perform high-altitude work and has a structure in which one lower end is pivotally hinged to the movable cart (10), the other lower end is movably connected to a guide rail (20), and the central part is pivotally hinged.
[0043] The ladder body (30) may be an LS-type ladder comprising a first H-shaped ladder section (31) whose lower end is rotatably hinged to a movable carriage (10), a second H-shaped ladder section (32) whose lower end is movably connected to a guide rail (20), and an A-shaped ladder section (33) whose central part is rotatably hinged and whose two sides are connected to the first and second H-shaped ladder sections (31, 32) so as to be movable relative in the up and down direction to enable overall height adjustment.
[0044] The first and second H-shaped ladder sections (31, 32) may be single H-shaped ladders, but depending on the embodiment, they may also be configured in the form of a structure connected in multiple stages for self-length adjustment. Additionally, an elastic hook may be installed at the top of the first and second H-shaped ladder sections (31, 32) to enable overall height adjustment through relative movement of the A-shaped ladder section (33) with respect to the first and second H-shaped ladder sections (31, 32), or to fix the adjusted height. Additionally, a hinge rotation adjustment pin may be provided at the center of the A-shaped ladder section (33) to select whether hinge rotation is possible.
[0045] In addition, a hinge bracket may be installed on the movable carriage (10) for hinge connection at the bottom of the first H-shaped ladder section (31), and at this time, the bottom of the first H-shaped ladder section (31) may be detachably connected to the hinge bracket by a hinge pin. In addition, a wheel or a slide moving block that is movably connected to the guide rail (20) may be provided at the bottom of the second H-shaped ladder section (32).
[0046] Since the structure of the ladder body (30), excluding the lower connecting structure described above, is identical or similar to the known LS type ladder, further detailed description is omitted here for the sake of simplification of the specification.
[0047] Meanwhile, as shown in FIG. 3, the height of the ladder body (30) can be adjusted through the relative movement of the A-shaped ladder section (33) with respect to the first and second H-shaped ladder sections (31, 32). At this time, the lower end of the first H-shaped ladder section (31) is fixed by a hinge connection, whereas the lower end of the second H-shaped ladder section (32) moves within the guide rail (20), moving away from the lower end of the first H-shaped ladder section (31) as the height of the ladder body (30) increases, and moving to be fitted into the lower end of the first H-shaped ladder section (31) as the height of the ladder body (30) decreases.
[0048] In addition, the height adjustment of the ladder body (30) through relative movement of the A-type ladder section (33) with respect to the first and second H-type ladder sections (31, 32) may be performed manually or automatically, and to achieve this, the ladder body (30) may further include a height adjustment means (34) for raising and lowering the A-type ladder section (33) with respect to the first and second H-type ladder sections (31, 32).
[0049] As shown in FIGS. 1 to 3, this height adjustment means (34) can be formed as a hydraulic, pneumatic, or electric cylinder mechanism in which the cylinder side is pivotally hinged to the end of a “T” shaped connecting plate connected to the bottom of the second H-shaped ladder section (32) and the end of a piston rod is pivotally hinged to the A-shaped ladder section (33). In this case, the bottom of the height adjustment means (34) can move integrally with the second H-shaped ladder section (32) according to the height adjustment by the height adjustment means (34).
[0050] In addition, the height adjustment means (34) can be formed as a hydraulic, pneumatic, or electric cylinder mechanism in which the cylinder side is hinged to be directly rotatable on the movable carriage (10) according to the embodiment, and the upper end of the piston rod is hinged to be rotatable on the A-type ladder part (33).
[0051] In addition, a hydraulic or pneumatic supply means and a power supply means for operating a height adjustment means (34) formed by a hydraulic, pneumatic, or electric cylinder mechanism may be loaded on the item loading platform (13) of the movable cart (10).
[0052] In addition, the height adjustment means (34) may include a wire, a pulley, and an electric winch as one of the known height adjustment configurations of a ladder, or may include a rack, a pinion, and a drive motor, and may be formed as various other height adjustment configurations of a ladder.
[0053] According to one embodiment of the disclosed content as described above, the movable ladder (1) is configured such that the movable cart (10) and the ladder body (30) are detachably connected to each other for transport to a work site or for vehicle mounting, and the movable cart (10) is also preferably provided with a hinge connection part in the longitudinal center so that it can be folded in half when the ladder body (30) is separated.
[0054] According to one embodiment of the disclosed content, the movable ladder (1) can be moved quickly and easily to another location as the height-adjustable ladder body (30) is installed on a movable cart (10) including a moving wheel (12) as shown in FIG. 4, thereby increasing convenience of use and, in particular, significantly improving work efficiency in cases where work at heights must be performed while moving around, such as ceiling lighting installation work.
[0055] In the case of a movable ladder (1) according to one embodiment of the disclosed content, since a loading platform (13) is provided on the movable cart (10), the ladder body (30) can be moved with items necessary for work loaded on it, thereby further improving work efficiency.
[0056]
[0057] Although preferred embodiments of the present invention have been described above with reference to the attached drawings, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all technical concepts of the present invention. Therefore, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application. Accordingly, the embodiments described above should be understood as illustrative in all respects and not restrictive, and the scope of the present invention is defined by the claims set forth below rather than by the detailed description. Furthermore, all modifications or variations derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included within the scope of the present invention.
[0058]
[0059] Explanation of drawing symbols
[0060] 1 : Portable ladder
[0061] 10 : Mobile cart
[0062] 11 : Square frame
[0063] 12 : Movement wheel
[0064] 13 : Goods storage rack
[0065] 14 : Foot brake mechanism
[0066] 14a : Brake footrest
[0067] 14b: Brake pad
[0068] 14c : Brake release footrest
[0069] 15: Anti-tipping outrigger mechanism
[0070] 15a : Side extension
[0071] 15b : Vertical grounding band
[0072] 20 : Guide rail
[0073] 30 : Ladder body
[0074] 31: 1st H-shaped ladder section
[0075] 32: 2nd H-shaped ladder section
[0076] 33 : Type A ladder section
[0077] 34 : Height adjustment means
[0078] The disclosed content is applicable to the field of ladders for high-altitude work.
Claims
1. Mobile trolley; Guide rails provided on both sides in the longitudinal direction of the above-mentioned movable carriage; and A movable ladder comprising a ladder body, wherein a lower end is pivotally hinged to the movable carriage, the lower other end is movably connected to the guide rail, and the central part is pivotally hinged.
2. In Claim 1, A movable ladder characterized by the above-mentioned movable cart comprising a square frame, a movable wheel fixed to the lower side of the square frame, and a loading platform installed on the square frame.
3. In Claim 2, A movable ladder characterized by further including a foot brake mechanism provided on one side of the square frame of the above-mentioned movable cart.
4. In Claim 2, A movable ladder characterized by further including anti-tipping outrigger mechanisms provided on the front and rear sides of the square frame of the above-mentioned movable cart.
5. In Claim 1, A movable ladder characterized in that the guide rail has a channel shape or a slide rail shape with opposing surfaces facing each other open.
6. In any one of claims 1 to 5, A movable ladder characterized by comprising: a first H-shaped ladder section whose lower end is rotatably hinged to the movable carriage; a second H-shaped ladder section whose lower end is movably connected to the guide rail; and an A-shaped ladder section whose central part is rotatably hinged and whose two sides are connected to the first and second H-shaped ladder sections so as to move relative to each other in the up and down direction, thereby enabling overall height adjustment.
7. In Claim 6, A movable ladder characterized in that the ladder body further includes a height adjustment means for raising and lowering the A-shaped ladder section relative to the first and second H-shaped ladder sections.