Aerial work platform with electric height adjustment function

Abstract

The present invention relates to an aerial work platform with an electric height adjustment function, in which rising bodies that rise by means of a lifting device are provided between a support body and a work box so as enable raising and lowering the latter, thus making it possible to stably raise and lower the work box using low level of power. The aerial work platform comprises: a support body in the form of a six-sided frame placed on the ground; two rising bodies in the form of rectangular frames arranged on and overlapping two facing sides, respectively, of the support body in the X-direction; a work box in the form of a six-sided frame that can be built inside the support body and is disposed inside the support body; first lifting ropes, one end of which are coupled to a drive motor and the other end of which are connected to the lower horizontal frames of the rising bodies via pulleys of upper support frames of the support body; and second lifting ropes, one end of which are coupled to the upper support frames of the support body and the other end of which are connected to support frames of the work box via pulleys of upper horizontal frames of the rising bodies.

Description

Aerial work platform with electric height adjustment function

[0001] The present invention relates to an aerial work platform having an electric height-lowering function, and more specifically, to an aerial work platform having an electric height-lowering function that enables stable raising and lowering of a work platform with a small amount of power by interposing a jumping body that jumps by an elevator device between a support and a work platform to enable raising and lowering of the work platform.

[0002] Typically, when performing maintenance work on the ceiling of a building, tunnel ceiling, or bridge, a work platform carrying workers and necessary materials is raised and lowered to the ceiling working height.

[0003] As an example of a device for raising and lowering such a work platform, Korean Patent Laid-Open Publication No. 10-2011-0043553 (publication date April 27, 2011) discloses a ladder assembly having a pillar, a handle, a step, a railing, a slant support, and a brace as main components, a single-stage work platform in which two ladder assemblies are placed in pairs facing each other, the step and the railing are positioned horizontally, the brace is slanted, and the slant support is erected slanted outward to construct a ladder work platform, a two-stage work platform (20) having the same ladder work platform construction method as the single-stage work platform but in which the two-stage ladder assembly slides outward from the first-stage ladder assembly, stops at the upper fixing member of the first-stage work platform, and is connected to the first stage, and a work platform having a structure using a three-stage ladder that is assembled in the same manner.

[0004] However, this conventional workbench raising / lowering structure had the problem of requiring a lot of time to adjust the workbench height as the ladder assembly had to be assembled to raise the height to 1, 2, and 3 steps.

[0005] As another example, Korean Patent No. 10-1632485 (registration date: June 15, 2016) discloses a working elevator comprising an electrically controlled elevator and a deck section installed to move up and down by the elevator section, the working elevator further comprising a plurality of pillar sections that are provided in a manner that can be stored or folded in the deck section and an upper frame section supported by the pillar sections, and a limit switch built into the pillar sections such that the elevator section is stopped by the operation of the limit switch due to an external force greater than a certain level transmitted through the upper frame.

[0006] However, in the above-mentioned conventional patent, a pantograph-shaped work platform was used as the lifting means, so there was a problem in that the lifting height was limited and safety was not secured when expanding the work platform to allow multiple people to work together and load materials.

[0007] Moreover, the pantograph-type lifting means of the above-mentioned conventional patent, despite the adoption of many auxiliary components, had a problem in that the stability of the lifting and lowering operation was low and a lot of electric power was structurally consumed during the lifting and lowering.

[0008] The present invention has been devised to solve the above-mentioned problems, and its purpose is to provide an aerial work platform having an electric height-lowering function that enables stable raising and lowering of the work platform with a small amount of power by interposing a jumping body that jumps by means of an elevator device between a support body and a work platform to enable raising and lowering of the work platform.

[0009] According to the present invention, an aerial work platform is provided, characterized by including: a support formed with a hexahedral frame shape and placed on the ground; two jumpers formed with a square frame shape and placed so as to overlap each other on two side surfaces facing each other in the X-axis direction of the support; a work box formed with a hexahedral frame shape that can be built into the support and placed within the support; a first lifting rope having one end connected to a driving motor and the other end connected to a lower horizontal frame of the jumper via a pulley of an upper support frame of the support; and a second lifting rope having one end connected to the upper support frame of the support and the other end connected to a support frame of the work box via a pulley of an upper horizontal frame of the jumper.

[0010] Preferably, the support is formed by vertically connecting the support frames to the four corners of the support structure, which is a surface structure in contact with the ground, and connecting the upper and lower portions of the left two support frames and the right two support frames facing each other in the X-axis direction to a horizontal upper support frame and a lower support frame, respectively, and the upper support frame and the lower support frame are connected to protrude from the outer surfaces of the two support frames so that the jumping body is arranged to overlap between the two support frames.

[0011] Preferably, the jumping body is formed by vertically connecting an upper horizontal frame and a lower horizontal frame, which are horizontal frames, to the upper and lower ends of two vertical frames spaced apart in the Y-axis direction, respectively, and one jumping body is arranged to be slidably overlapped in the vertical direction between two support frames arranged on the left side of the support body, and the other jumping body is arranged to be slidably overlapped in the vertical direction between two support frames arranged on the right side of the support body.

[0012] Preferably, the workbench is formed so that the opening door and the railing are installed upright in the Z-axis direction on the upper part of the workbench on a horizontal surface, and the left and right sides of the workbench placed at the bottom are formed as support frames.

[0013] Preferably, the first lifting rope is connected at one end to a driving motor, passes through a pulley of a lower support frame of the support body first, passes through a pulley of an upper support frame second, and is connected at the other end to a lower horizontal frame of the jumping body, and the first lifting rope is composed of two, each of which is installed at the center of two sides facing each other in the X-axis direction of the support body, and is characterized in that it connects the support body and the jumping bodies on both the left and right sides, respectively.

[0014] Preferably, it further comprises a safety cover having both ends connected to the upper and lower support frames of the support body and having a first lifting rope built in therein to cover it so that it is not exposed to the outside.

[0015] Preferably, the second lifting rope is characterized in that one end is connected to the upper support frame of the support body, passes through the pulley of the upper horizontal frame of the jumping body for the first time, and the other end is connected to the support frame of the work box, and the second lifting rope is composed of two sets of two each, and the second lifting ropes of each set are respectively installed on two sides facing each other in the X-axis direction of the support body, and one set of the second lifting ropes is arranged to be spaced apart in the Y-axis direction with the first lifting rope at the center.

[0016] Preferably, in any one of the above-described features, a brake is installed on the upper support frame of the support body and the lower horizontal frame of the jumper body to prevent the jumper body and the workpiece from falling in an elevated state.

[0017] Preferably, in any one of the above-described features, a plurality of first guide members are further included, each of which comprises a slide plate on a plate and two spaced sliding rollers protruding from one surface of the slide plate; wherein the first guide member is characterized in that the slide plate is fixedly installed between a support frame of a support body and a vertical frame of a jumping body to the support frame or the vertical frame, and the protruding sliding rollers are arranged to surround both sides of the vertical frame in the X-axis direction or are arranged to surround both sides of the support frame in the X-axis direction.

[0018] Preferably, in any one of the above-described features, a second guide member is further comprised of a support protruding upward from a support frame of a work box, a T-shaped plate fixed to the support and having a protruding portion protruding toward a vertical frame of a jumping body, and a plurality of sliding rollers protruding from the T-shaped plate toward an outer surface and an inner surface of the vertical frame; wherein the second guide member is characterized in that the T-shaped plate is fixedly installed on the work box, and the protruding portion protruding from the T-shaped plate and the plurality of sliding rollers provided on the body come into contact with each other so as to rotate along an outer surface and an inner surface of the vertical frame in the X-axis direction.

[0019] According to the present invention, a jumping body that jumps by means of an elevator device is interposed between a support and a work box, thereby enabling the work box to be raised and lowered, thereby enabling stable raising and lowering of the work box with a small amount of power.

[0020] Figure 1 is a perspective view of a lowered state of an aerial work platform according to an embodiment of the present invention.

[0021] Figure 2 is a perspective view of an elevated state of a high-altitude work platform according to an embodiment of the present invention.

[0022] Figure 3 is a side view of a lowered state of a high-altitude work platform according to an embodiment of the present invention.

[0023] Figure 4 is a side view of an elevated state of a high-altitude work platform according to an embodiment of the present invention.

[0024] FIG. 5 is a drawing for explaining a first guide roller according to an embodiment of the present invention.

[0025] FIG. 6 is a drawing for explaining a second guide roller according to an embodiment of the present invention.

[0026] Explanation of key symbols in the drawing

[0027] 100: Support 110: Support

[0028] 111: Lower support frame 120: Support frame

[0029] 121: Upper support frame 122: Structural support

[0030] 130: Auxiliary ladder 200: Jumping body

[0031] 210: Vertical frame 220: Horizontal frame

[0032] 221: Lower horizontal frame 222: Upper horizontal frame

[0033] 300: Workbench 310: Workbench

[0034] 311: Support frame 320: Opening door

[0035] 330: Railing 400: Outrigger

[0036] 500: Elevator 510: Drive motor

[0037] 520: First lifting rope 530: Second lifting rope

[0038] 540: Safety cover 550: Brake

[0039] 560: First guide member 570: Second guide member

[0040] A support formed to have a hexahedral frame shape and placed on the ground; two jumpers formed to have a square frame shape and placed so as to overlap each other on two sides facing each other in the X-axis direction of the support; a work box formed to have a hexahedral frame shape that can be built into the support and placed within the support; a first lifting rope having one end connected to a driving motor and the other end connected to a lower horizontal frame of the jumper via a pulley of an upper support frame of the support; and a second lifting rope having one end connected to the upper support frame of the support and the other end connected to a support frame of the work box via a pulley of an upper horizontal frame of the jumper., and the support body is a structure on the surface in contact with the ground, and the support frames are vertically connected to the four corners of the support, and the upper and lower portions of the left two support frames and the right two support frames facing each other in the X-axis direction are respectively combined into a horizontal upper support frame and a lower support frame, and the upper support frame and the lower support frame are protrudingly combined on the outer surface of the two support frames, and the jumping body is arranged to overlap between the two support frames, and the jumping body is formed by vertically combining the upper and lower horizontal frames, which are horizontal frames, at the upper and lower ends of the two vertical frames spaced apart in the Y-axis direction, respectively, and one jumping body is arranged to be slidably overlapped in the vertical direction between the two support frames arranged on the left side of the support body, and the other jumping body is arranged to be slidably overlapped in the vertical direction between the two support frames arranged on the right side of the support body, and the work box is formed on the upper part of the worktable on the horizontal surface, and the opening and closing door and the handrail are arranged in the Z-axis direction. It is formed to be installed upright, and the left and right sides of the work table arranged at the bottom are formed as a support frame, and the first lifting rope has one end connected to the driving motor, passes through the pulley of the lower support frame of the support body for the first time and passes through the pulley of the upper support frame for the second time, and the other end is connected to the lower horizontal frame of the jumping body, and the first lifting rope is composed of two, and is respectively installed at the center of two sides facing each other in the X-axis direction of the support body to connect the support body and the jumping bodies on both the left and right sides, and is characterized in that it further includes a safety cover which is fastened at both ends to the upper support frame and the lower support frame of the support body and covers the first lifting rope so that it is not exposed to the outside.

[0041] Hereinafter, the embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or similar components will be given the same reference numbers, and redundant descriptions thereof will be omitted. The suffixes "module" and "part" used for components in the following description are assigned or used interchangeably only for the convenience of writing the specification, and do not in themselves have distinct meanings or roles. In addition, when describing the embodiments disclosed in this specification, if it is determined that a specific description of a related known technology may obscure the gist of the embodiments disclosed in this specification, a detailed description thereof will be omitted. In addition, the attached drawings are only intended to facilitate easy understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention.

[0042] Terms that include ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by these terms. These terms are used solely to distinguish one component from another.

[0043] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0044] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0045] In this application, terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood not to exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0046] FIG. 1 is a perspective view of an aerial work platform in a lowered state according to an embodiment of the present invention, FIG. 2 is a perspective view of an aerial work platform in a raised state according to an embodiment of the present invention, FIG. 3 is a side view of an aerial work platform in a lowered state according to an embodiment of the present invention, and FIG. 4 is a side view of an aerial work platform in a raised state according to an embodiment of the present invention.

[0047] Referring to FIGS. 1 to 4, an aerial work platform according to an embodiment of the present invention is configured to raise or lower the height of a work box (300) where a worker is positioned in a state fixed to the ground according to the driving force.

[0048] In particular, in the method of raising and lowering the work box (300), unlike the existing method, it has a structure in which a jumping body (200) is interposed between a support body (100) fixed to the ground and the work box (300) which is the object to be raised and lowered, and they are connected by an raising rope (520, 530), and the jumping body (200) is raised and lowered by the force of pulling and releasing the raising rope (520), and at the same time, the work box (300) is raised and lowered in accordance with the raising and lowering movement of the jumping body (200), thereby enabling the raising and lowering of the work box (300) structurally stable.

[0049] The aerial work platform having such an electric height-lowering function comprises a support (100) formed to have a hexahedral frame shape and placed on the ground, two jumping bodies (200) formed to have a square frame shape and placed to overlap each other on two sides facing each other in the X-axis direction of the support (100), a work box (300) formed to have a hexahedral frame shape that can be built into the support (100) and placed in the support (100), a first lifting rope (520) having one end connected to a driving motor (510) and the other end connected to a lower horizontal frame (221) of the jumping body (200) via a pulley of an upper support frame (121) of the support (100), and one end connected to an upper support frame (121) of the support (100) and the upper horizontal frame (221) of the jumping body (200). It may be configured to include a second lifting rope (530) whose other end is connected to the support frame (311) of the work box (300) via a pulley of the frame (222).

[0050] First, the support (100) is formed by vertically connecting the support frames (120) to the four corners of the support (100), which is a structure on the surface in contact with the ground, and connecting the upper and lower portions of the two left support frames (120) and the two right support frames (120) facing each other in the X-axis direction with a horizontal upper support frame (121) and a lower support frame (111), respectively, to form a roughly hexahedral frame shape. Here, the structural support (122) can be installed to horizontally connect the left and right support frames (120) to reinforce the hexahedral structure.

[0051] At this time, the upper support frame (121) and the lower support frame (111) are protrudingly connected to the outer surfaces of the two support frames (120). Since the upper support frame (121) and the lower support frame (111) are protrudingly connected to the outer side of the support body (100), the jumping body (200) described below can be arranged to overlap between the two support frames (120), and the jumping body (200) arranged in this way has a movement in the Z-axis direction that is not interfered with by the upper support frame (121) and the lower support frame (111), and at the same time, the movement in the Y-axis direction is restricted by the two support frames (120), so that it does not flow in the Y-axis direction and enables more stable lifting and lowering movement.

[0052] Here, an auxiliary ladder (130) may be installed on the support frame (120). This auxiliary ladder (130) provides a path for workers to escape when the lifting function of the work box (300) does not function properly due to a short circuit or other reasons while the work box (300) is raised.

[0053] Next, the above-mentioned jumping body (200) is formed by vertically connecting the upper and lower ends of two vertical frames (210) spaced apart in the Y-axis direction, which are horizontal frames (220), namely, an upper horizontal frame (222) and a lower horizontal frame (221), respectively, to form a roughly rectangular skeleton shape.

[0054] Here, two of the above-mentioned jumping bodies (200) are installed on the support (100) and are respectively placed on two sides facing each other in the X-axis direction of the support (100).

[0055] One jumping body (200) is arranged so as to be slidably overlapped in the vertical direction between two support frames (120) arranged on the left side of the support body (100), and the other jumping body (200) is arranged so as to be slidably overlapped in the vertical direction between two support frames (120) arranged on the right side of the support body (100).

[0056] And the above work platform (300) is formed to have a roughly hexahedral frame shape by installing an opening door (320) and a railing (330) in the Z-axis direction on the upper part of a work platform (310) on a horizontal surface that a worker steps on.

[0057] Here, the left and right sides of the worktable (310) placed at the bottom become support frames (311) related to the lifting drive.

[0058] This work box (300) has a horizontal width and length smaller than the horizontal width and length formed by the four support frames (120) of the support (100), and can be moved in the up-and-down direction while placed within the support (100).

[0059] The above railing (330) is installed at a specified height to prevent workers from falling while working on the workbench (310).

[0060] In addition, the above-mentioned opening door (320) is configured to allow the worker to enter and exit the work box (300), has a structure that opens toward the inside of the work box (300), and has a structure that automatically closes again by an internal spring.

[0061] Here, an outrigger (400) for structural stability may be installed at the bottom of the four support frames (120) of the support (100). The outrigger (400) is a structure that folds inward when not in operation or moving, and unfolds outward and comes into contact with the ground when in operation or when the work box (300) is raised. A control device connected to the elevation drive of the elevator device (500) described below may be installed on the outrigger (400), so that the elevation drive of the elevator device (500) is not performed when the outrigger (400) is not deployed, and the elevation drive of the elevator device (500) is performed only when the outrigger (400) is deployed.

[0062] A driving motor (510) is installed at the bottom of this support (100).

[0063] The above driving motor (510) is coupled to one end of the first lifting rope (520) to pull or release the first lifting rope (520).

[0064] The first lifting rope (520) is connected at one end to the driving motor (510), passes through the pulley of the lower support frame (111) of the support body (100) first, and passes through the pulley of the upper support frame (121) second, and is connected at the other end to the lower horizontal frame (221) of the jumping body (200).

[0065] This first lifting rope (520) is composed of two pieces, each installed at the center of two sides facing each other in the X-axis direction of the support (100) to connect the support (100) and the left and right jumping bodies (200), respectively.

[0066] Looking at the movement of the first lifting rope (520), when the driving motor (510) pulls the first lifting rope (520) in a state where the jumping bodies (200) on the left and right sides of the support body (100) have descended (Fig. 1 and Fig. 3), the lower horizontal frame (221) of the jumping body (200) to which the end of the first lifting rope (520) is connected is pulled upward, causing the jumping body (200) to rise upward.

[0067] In addition, when the driving motor (510) releases the first lifting rope (520) while the jumping bodies (200) on both the left and right sides of the support body (100) are raised (Figs. 2 and 4), the lower horizontal frame (221) of the jumping body (200) to which the end of the first lifting rope (520) is connected falls downward, causing the jumping body (200) to descend downward.

[0068] At this time, reference numeral 540 is a safety cover, which is provided to cover the first elevator rope (520) so that the first elevator rope (520), which is strongly pulled and released at a person's height, is not exposed to the outside. This safety cover (540) is fastened at both ends to the upper support frame (121) and the lower support frame (111) of the support (100) and houses the first elevator rope (520).

[0069] The second lifting rope (530) is connected at one end to the upper support frame (121) of the support body (100), passes through the pulley of the upper horizontal frame (222) of the jumping body (200), and is connected at the other end to the support frame (311) of the work box (300).

[0070] The second lifting ropes (530) are composed of two sets of two each, and the second lifting ropes (530) of each set are installed on two sides facing each other in the X-axis direction of the support (100), and one set of the second lifting ropes (530) are arranged to be spaced apart in the Y-axis direction with the first lifting rope (530) at the center.

[0071] Looking at the movement of the second lifting rope (530), when the jumping bodies (200) on the left and right sides of the support body (100) are lowered (Fig. 1 and Fig. 3), when the first lifting rope (520) raises the jumping body (200) upward, the end of the second lifting rope (530), which is connected to the upper support frame (121) of the support body (100) and is pulley-connected to the upper horizontal frame (222) of the jumping body (200), pulls up the support frame (311) of the work box (300) as the jumping body (200) rises, causing the work box (300) to rise upward.

[0072] In addition, when the first lifting rope (520) lowers the lifting body (200) downwards while the left and right sides of the support body (100) are in an elevated state (FIGS. 2 and 4), the end of the second lifting rope (530) which is connected to the upper support frame (121) of the support body (100) and is pulley-connected to the upper horizontal frame (222) of the lifting body (200) drops the support frame (311) of the work box (300) downwards as the lifting body (200) is lowered.

[0073] This second lifting rope (530) is a fixed structure having a fixed length.

[0074] Referring to FIGS. 2 and 4 here, in order to prevent the jumping body (200) and the work box (300) in the rising state from falling suddenly, a brake (550) may be installed on the upper support frame (121) of the support body (100) and the lower horizontal frame (222) of the jumping body (200). The brake (550) has one rope connected to the lower horizontal frame (222) of the jumping body (200) and the other rope connected to the upper support frame (121) of the support body (100), and maintains tension on both ropes when the jumping body (200) is lowered suddenly, thereby preventing the jumping body (200) from falling suddenly.

[0075] FIG. 5 is a drawing for explaining a first guide roller according to an embodiment of the present invention, and FIG. 6 is a drawing for explaining a second guide roller according to an embodiment of the present invention.

[0076] In the present invention, a first guide member (560) and a second guide member (570) are further provided to prevent the detachment of a jumping body (200) that slides up and down along a support (100) and a work box (300) that slides up and down along the jumping body (200) and to enable smooth sliding movement.

[0077] First, the first guide member (560) may be composed of a slide plate (561) on a plate as shown in FIG. 5 and two spaced sliding rollers (562) protruding from one side of the slide plate (561).

[0078] This first guide member (560) can be installed in two ways.

[0079] The method is such that a slide plate (561) is fixedly installed between a support frame (120) of a support body (100) and a vertical frame (210) of a jumping body (200) on the support frame (120), and a protruding sliding roller (562) is arranged to wrap around both sides of the vertical frame (210) in the X-axis direction.

[0080] Another method is to have a slide plate (561) fixedly installed between the support frame (120) of the support body (100) and the vertical frame (210) of the jumping body (200), and a protruding sliding roller (562) arranged to surround both sides of the support frame (120) in the X-axis direction.

[0081] This first guide member (560) will fundamentally prevent the jumping body (200) that slides up and down along the support (100) from flowing in the X-axis direction. In addition, this first guide member (560) can be installed in multiple numbers by combining the two installation methods described above.

[0082] Accordingly, as described above, since the movement of the jumping body (200) in the Y-axis direction is restricted by the two support frames (120), and the movement in the X-axis direction is prevented by the first guide member (560), the lifting and lowering movement of the jumping body (200) is performed smoothly and stably.

[0083] At this time, the sliding roller (562) is configured to rotate idly, and its outer surface may be covered with an elastic material such as rubber to prevent friction noise and scratches on the outer surface.

[0084] Next, the second guide member (570) is installed and supported on the work box (300).

[0085] Referring to FIG. 6, the second guide member (570) may be composed of two supports (571) protruding upward from the support frame (311) of the work box (300), a connecting member (572) that horizontally connects and supports the two supports (571), a T-shaped plate (573) that is fixed to the support (571) and has a protruding portion that protrudes toward the vertical frame (210) of the jumping body (200), and a plurality of sliding rollers (574) that protrude from the T-shaped plate (573) to the outer and inner surfaces of the vertical frame (210). More specifically, a sliding roller (574) that contacts the outer surface of the vertical frame (210) is installed on the protruding portion of the T-shaped plate (573), and two sliding rollers (574) that contact the inner surface of the vertical frame (210) are installed vertically on the vertical body of the T-shaped plate (573).

[0086] This second guide member (570) will allow the work box (300) to slide stably in a straight up and down direction during a lifting operation in which the jumping body (200) and the work box (300) move simultaneously.

[0087] Basically, since the second lifting rope (530) is bent in an inverted U shape with respect to the upper horizontal frame (222) of the jumping body (200) and performs the lifting and lowering operation of the work box (300), a strong force is applied between the work box (300) and the jumping body (200) to move away from the lifting operation. If there is a large gap between the work box (300) and the jumping body (200) in this way, the work box (300) cannot help but move significantly in the air.

[0088] The configuration that prevents this is the second guide member (570).

[0089] The second guide member (570) is fixedly installed on the support plate (311) of the workpiece (300) by a T-shaped plate (573), and the protruding portion protruding from the T-shaped plate (573) and the sliding rollers (574) provided on the body are in contact with each other so as to rotate along the outer and inner surfaces of the X-axis direction of the vertical frame (210).

[0090] Since the second guide member (570) fixed and supported on the work box (300) in this way continues to attach the work box (300) to the jumper (200) within the length range of the protruding portion of the T-shaped plate (573), the clearance between the work box (300) and the jumper (200) is controlled, and ultimately the phenomenon of the work box (300) floating in the air disappears. In addition, due to this second guide member (570), the work box (300) will be able to slide stably in the up-and-down straight direction.

[0091] This second guide member (570) is fixed to two support frames (311) in the X-axis direction in the work box (300) and installed in conjunction with the jumping bodies (200) on both sides.

[0092] At this time, the sliding roller (574) is configured to rotate idly, and its outer surface may be covered with an elastic material such as rubber to prevent friction noise and scratches on the outer surface.

[0093] As described above, the best practice embodiments have been disclosed in the drawings and specifications. While specific terminology has been used herein, it is solely for the purpose of describing the present invention and is not intended to limit the scope of the invention as defined in the claims. Therefore, those skilled in the art will understand that various modifications and equivalent embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

[0094] As described above, the aerial work platform having an electric height-lowering function according to the present invention is an invention with very high industrial applicability because it enables stable raising and lowering of the work platform with a small amount of power by interposing a jumping body that jumps by means of an elevating device between the support body and the work platform to enable the work platform to be raised and lowered.

Claims

1. A support formed in the shape of a hexahedral skeleton and placed on the ground; Two jumping bodies formed in a square skeleton shape and arranged to overlap each other on two sides facing each other in the X-axis direction of the support body; A workpiece formed to have a hexahedral skeleton shape that can be embedded within the support and placed within the support; A first lifting rope having one end connected to a driving motor and the other end connected to a lower horizontal frame of the jumping body via a pulley of an upper support frame of the support body; and A second lifting rope having one end connected to the upper support frame of the support body and the other end connected to the support frame of the work box via a pulley of the upper horizontal frame of the jumping body; The above support is formed by vertically connecting the support frames to the four corners of the support structure, which is a surface structure in contact with the ground, and connecting the upper and lower portions of the two left support frames and the two right support frames facing each other in the X-axis direction to form a horizontal upper support frame and a lower support frame, respectively. The upper support frame and the lower support frame are protrudingly connected to the outer surfaces of the two support frames, and the jumping body is placed so as to overlap between the two support frames. The above-mentioned jumping body is formed by vertically connecting the upper and lower horizontal frames, which are horizontal frames, to the upper and lower ends of two vertical frames spaced apart in the Y-axis direction, respectively. One jumping body is arranged so as to be vertically slidably overlapped between two support frames arranged on the left side of the support body, and the other jumping body is arranged so as to be vertically slidably overlapped between two support frames arranged on the right side of the support body. The above workbench is formed by installing the opening door and the railing in the Z-axis direction on the upper part of the workbench on a horizontal surface. The left and right sides of the workbench placed at the bottom are formed by a support frame, The first lifting rope is connected at one end to the driving motor, passes through the pulley of the lower support frame of the support body first, passes through the pulley of the upper support frame second, and has the other end connected to the lower horizontal frame of the jumping body. The above first lifting rope is composed of two, each installed at the center of two sides facing each other in the X-axis direction from the support body, and connects the support body and the left and right jumping bodies, respectively. An aerial work platform characterized by further including a safety cover that is connected at both ends to the upper and lower support frames of the support body and covers the first lifting rope so that it is not exposed to the outside.

2. In paragraph 1, The second lifting rope has one end connected to the upper support frame of the support body, passes through the pulley of the upper horizontal frame of the jumping body, and the other end is connected to the support frame of the work box. An aerial work platform characterized in that the second lifting ropes are composed of two sets of two each, and the second lifting ropes of each set are installed on two sides facing each other in the X-axis direction from the support, and one set of second lifting ropes are arranged spaced apart in the Y-axis direction with the first lifting rope at the center.

3. In paragraph 1 or 2, An aerial work platform characterized in that a brake is installed on the upper support frame of the support body and the lower horizontal frame of the jumper to prevent the jumper and work box from falling when in an elevated state.

4. In paragraph 1 or 2, A plurality of first guide members comprising a slide plate on a plate and two spaced sliding rollers protruding from one side of the slide plate; The above first guide member, An aerial work platform characterized in that a slide plate is fixedly installed between a support frame of a support body and a vertical frame of a jumping body to a support frame or a vertical frame, and protruding sliding rollers are arranged to wrap around both sides of the vertical frame in the X-axis direction or are arranged to wrap around both sides of the support frame in the X-axis direction.

5. In paragraph 1 or 2, It further includes a second guide member comprising a support protruding from the upper side of the support frame of the work box, a T-shaped plate fixed to the support and having a protruding portion protruding toward the vertical frame of the jumping body, and a plurality of sliding rollers protruding from the T-shaped plate to the outer surface and inner surface of the vertical frame; The above second guide member, An aerial work platform characterized in that a T-shaped plate is fixedly installed on a work surface, and a plurality of sliding rollers provided on a body and a protruding portion protruding from the T-shaped plate rotate along the outer and inner surfaces of a vertical frame in the X-axis direction.

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