Foldable ladder

Abstract

The utility model relates to a foldable ladder which comprises a pair of hinged ladder assemblies, each ladder assembly comprises a pair of vertical rods distributed in parallel and a plurality of pedals connected between the two vertical rods, and the top ends of the vertical rods located on the same side in the two ladder assemblies are hinged; each pedal comprises a pair of hinged pedal split bodies, the other sides of the two pedal split bodies are hinged to the two vertical rods respectively, a vertically-arranged auxiliary connecting rod is further arranged between the two vertical rods of the same ladder frame, and the auxiliary connecting rod is located at the hinged position of the two pedal split bodies of the same pedal. The auxiliary connecting rod is hinged to the pedal split bodies, and a notch allowing the auxiliary connecting rod to penetrate through and move up and down is further formed in the side, close to the auxiliary connecting rod, of each pedal split body. According to the ladder disclosed by the utility model, the auxiliary connecting rods hinged with the pedal split bodies are arranged at the hinged parts of the pedal split bodies, so that the pedal split bodies in a horizontal state are supported in an auxiliary manner through the auxiliary connecting rods, the strength of the whole pedal is further improved, and the ladder is convenient for follow-up personnel to tread.

Description

Technical Field

[0001] The utility model relates to the field of stepladders, in particular to a foldable stepladder. Background Art

[0002] A herringbone ladder, also known as a folding ladder, is a type of climbing tool used to work in the space above a plane. When it is used, the front and rear ladder rods and the ground form an isosceles triangle, which looks like a "human" character, so it is figuratively called a "herringbone ladder". Practical herringbone ladders include fixed herringbone ladders and movable herringbone ladders. Fixed herringbone ladders are temporary building tools for people; movable herringbone ladders are two ladders connected at the top with loose-leaf hinges, which can be folded when moved. Due to its flexibility, it is widely used in temporary climbing operations.

[0003] For example, the patent CN205172405U mentions a portable herringbone ladder that can be folded twice, which includes two ladder faces that can form a "herringbone" shape and two connecting blocks; each ladder face includes two parallel vertical rods and a plurality of groups of crossbeams; each group of crossbeams includes two crossbeam units that can be nested. The ladder faces are closed by the hinge of the connecting blocks, which is the first folding; the ladder face can be folded horizontally by the hinge between the crossbeam units and the hinge between the crossbeam units and the vertical rods, which is the second folding.

[0004] Although the herringbone ladder of the above patent has achieved secondary folding and reduced the occupied area in the horizontal direction after folding, it adopts a combination of a double-arm beam unit and a single-arm beam unit for the beam for people to step on. The connection between the double-arm beam unit and the single-arm beam unit is only hinged, and the double-arm beam unit and the double-arm side uprights, and the single-arm beam unit and the single-side wall uprights are also only hinged. This easily leads to instability of the double-arm beam unit and the single-arm beam unit, especially when people step on it or stand for a long time. Once instability occurs, it will bring safety hazards; in addition, for the cooperation between the double-arm beam unit and the single-arm beam unit, when folding, the single-arm beam unit can be retracted into the double-arm beam unit. Under such cooperation, in order to ensure the strength of both, both must have a certain thickness and width, which will result in the thickness and width of the final single beam being relatively large, the weight and size of the beam being relatively large, and the weight of the entire herringbone ladder is relatively increased. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a foldable ladder which can reduce the occupied area in the horizontal direction after being folded and has high structural strength.

[0006] In order to solve the above technical problems, the technical solution of the utility model is: a foldable ladder, the innovation of which is:

[0007] A pair of hinged ladder frames, the ladder frames comprising a pair of parallel vertical poles and a plurality of pedals connected between the two vertical poles, the top ends of the vertical poles on the same side of the two ladder frames being hinged;

[0008] The pedal comprises a pair of hinged pedal parts, and the other sides of the two pedal parts are hinged to two upright poles respectively;

[0009] A vertical auxiliary connecting rod is also arranged between the two uprights of the same ladder frame. The auxiliary connecting rod is located at the hinge of the two pedal parts of the same pedal, and the auxiliary connecting rod is hinged to each pedal part. A notch is also provided on one side of the pedal part close to the auxiliary connecting rod to allow the auxiliary connecting rod to pass through and move up and down.

[0010] When in the folded state, the two pedals of the same pedal are separated and arranged in an inverted V shape;

[0011] When in use, the two pedals of the same pedal are distributed in a straight line, and the bottom end of the auxiliary connecting rod is flush with the bottom end of the vertical rod.

[0012] Furthermore, the pedal is split into an inverted U-shaped structure consisting of a top plate located on the upper side and side plates connected to both sides of the top plate and extending vertically downward. The cross-section of the top plate is arc-shaped, and the arc-shaped opening of the top plate faces downward.

[0013] Furthermore, a plurality of first reinforcing rib plates extending along the long axis direction of the top plate are also arranged on the bottom surface of the top plate.

[0014] Furthermore, the vertical pole is a C-shaped channel steel structure, and the C-shaped openings of the two vertical poles of the same ladder frame are relatively distributed, and a plurality of second reinforcing rib plates extending along the long axis direction of the vertical pole are also arranged on the inner wall of the vertical pole.

[0015] The advantages of the utility model are as follows: the human ladder in the utility model realizes one folding by the hinge of the vertical rod, and then realizes a second folding by the hinge between the pedal splits, thereby reducing the space occupied by the folded human ladder in the horizontal direction, and by arranging an auxiliary connecting rod hinged to the pedal split at the hinge of the pedal split, the auxiliary connecting rod plays an auxiliary supporting role for the pedal split in the horizontal state, thereby improving the strength of the entire pedal and facilitating the stepping of subsequent personnel.

[0016] For the setting of the split pedal, an inverted U-shaped structure formed by connecting the top plate and the side plate is adopted, and the cross-section of the top plate is designed to be an arc shape, so as to improve the structural strength of the split pedal without making the split pedal thicker or wider. Moreover, this hollow design also reduces the weight of the final pedal. On the basis of ensuring the strength of the pedal, weight reduction is achieved, and the final weight of the human ladder is also light.

[0017] The design of the first reinforcing rib plate on the bottom surface of the top plate is to further strengthen the structural strength of the top plate.

[0018] The structure of the upright pole adopts a C-shaped channel steel structure, and cooperates with the second reinforcing rib plate on the inner wall, which also achieves the purpose of reducing weight while ensuring the strength of the upright pole, providing a basis for ultimately reducing the weight of the human ladder. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the foldable ladder of the utility model.

[0020] Figure 2 It is a side view of the foldable ladder of the utility model.

[0021] Figure 3 It is a schematic diagram of the neutral pole of the utility model.

[0022] Figure 4 It is a schematic diagram of the pedal split in the utility model.

[0023] Figure 5 It is a bottom view of the split pedal in the utility model.

[0024] Figure 6 It is a schematic diagram of the cooperation between the pedal and the auxiliary connecting rod in the utility model. DETAILED DESCRIPTION

[0025] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0026] like Figure 1-Figure 6 A foldable ladder comprising

[0027] A pair of hinged ladder frames, the ladder frames include a pair of parallel distributed vertical poles 1 and a plurality of pedals connected between the two vertical poles 1, and the top ends of the two vertical poles 1 located on the same side of the two ladder frames are hinged.

[0028] like Figure 3As shown in the schematic diagram, the upright pole 1 is a C-shaped channel steel structure, and the C-shaped openings of the two upright poles 1 of the same ladder frame are relatively distributed. A plurality of second reinforcing ribs 11 extending along the long axis direction of the upright pole 1 are also provided on the inner wall of the upright pole 1, and each second reinforcing rib 11 is distributed in parallel along the width direction of the upright pole 1. The structure of the upright pole 1 adopts a C-shaped channel steel structure, and cooperates with a plurality of second reinforcing ribs 11 on the inner wall of the upright pole 1. The second reinforcing ribs 11 are used to improve the structural strength of the upright pole 1, and the design of the C-shaped channel steel is used to reduce the weight of the upright pole 1, thus achieving the purpose of reducing weight while ensuring the strength of the upright pole 1, and providing a basis for ultimately reducing the weight of the human ladder.

[0029] A hinge seat is arranged at the top of the vertical pole 1, and the hinge seat includes a hinge seat body 13, the upper end face of the hinge seat body 13 is an arc surface, and a circular connection seat 12 is also arranged on one side of the upper end face of the hinge seat body 13, and the width of the connection seat 12 is 1 / 2 of the width of the hinge seat body 13, and the connection seats 12 on the two hinge seat bodies 13 on the two hinged vertical poles 1 are staggered, so that when hinged, the connection seat 12 on one hinge seat body 13 fits with the half of the other hinge seat body 13 that is not provided with the connection seat 12, and a limiting block is also arranged on one side of the two connecting seats 12 adjacent to each other, and the opening angle of the two vertical poles 1 is hard limited by the two limiting blocks on the two connecting seats 12 abutting against each other, and the maximum opening angle of the vertical poles 1 is controlled to avoid the phenomenon of arbitrary rotation of the vertical poles 1. In subsequent use, the opening angle of the two vertical poles 1 can also be controlled by adding a connecting rope between the pedals of the two ladder racks.

[0030] The pedal comprises a pair of hinged pedal parts 2, and the other sides of the two pedal parts 2 are respectively hinged to two upright poles 1 of the same ladder frame.

[0031] like Figure 4 , Figure 5 As shown in the schematic diagram, the pedal body 2 is an inverted U-shaped structure composed of a top plate 23 located on the upper side and side plates 24 connected to both sides of the top plate 23 and extending vertically downward. The cross section of the top plate 23 is arc-shaped, and the arc opening direction of the top plate 23 faces downward. The side plates 24 are rectangular plates, and a hinge hole for the pedal body 2 to be hinged is respectively opened on both sides of the long axis direction of the side plates 24. For the setting of the pedal body 2, an inverted U-shaped structure formed by connecting the top plate 23 and the side plates 24 is adopted, and the cross section of the top plate 23 is designed to be arc-shaped, so that the structural strength of the pedal body 2 can be improved, and the pedal body 2 does not need to be made thicker or wider. Moreover, this hollow design also reduces the weight of the pedal formed in the end, and weight reduction is achieved on the basis of ensuring the strength of the pedal, so the weight of the final human ladder is also light.

[0032] Several first reinforcing ribs 21 extending along the long axis direction of the top plate 23 are also provided on the bottom surface of the top plate 23. The design of the first reinforcing ribs 21 on the bottom surface of the top plate 23 is to further strengthen the structural strength of the top plate 23. Since the top plate 23 is the main load-bearing member for supporting personnel, the structure of the top plate 23 is further strengthened by adding the first reinforcing ribs 21 to improve its structural strength.

[0033] For the two pedal parts constituting the bottom pedal, a square tube structure may be directly adopted. Since the bottom pedal itself is closer to the ground, it is generally used as a transition and people will not stand on it for a long time. Therefore, the pedal may be directly constructed of a square tube.

[0034] A vertical auxiliary connecting rod 3 is also provided between the two uprights 1 of the same ladder frame. The auxiliary connecting rod 3 is a common hollow square tube structure. The auxiliary connecting rod 3 is located at the hinge of the two pedal parts 2 of the same pedal, and the auxiliary connecting rod 3 is hinged to each pedal part 2. Figure 6 As shown, a notch 22 is provided on one side of the top plate of the pedal body 2 close to the auxiliary connecting rod 3 for the auxiliary connecting rod 3 to pass through and move up and down. The notch 22 is rectangular in shape, and when the two pedal bodies 2 are in a horizontal state, the notches 22 on the two pedal bodies 2 are butted together to form a rectangular through hole that fits the outer wall of the auxiliary connecting rod 3.

[0035] When folding, the two uprights 1 are manually held to drive the two uprights 1 to close along the hinge points between the uprights 1 to achieve one folding, and then the auxiliary connecting rod 3 is manually held to move upward, thereby driving all the pedal segments 2 to swing upward along the hinge points between the pedal segments 2 and the auxiliary connecting rod 3 to achieve a second folding. After folding into place, the two pedal segments 2 of the same pedal are distributed in an inverted V shape. By folding twice, the space occupied by the folded human ladder in the horizontal direction is reduced.

[0036] When in use, two upright poles 1 are manually held and driven to open along the hinge points between the upright poles 1, so that the two ladder frames are opened to form a Figure 1 The auxiliary connecting rod 3 is manually held and moved downward, thereby driving all the pedal segments 2 to swing downward along the hinge points of the pedal segments 2 and the auxiliary connecting rod 3 until the two pedal segments 2 of the same pedal are distributed in a straight line, and the bottom ends of the auxiliary connecting rods 3 are flush with the bottom ends of the vertical rods 1 at this time. In this way, the auxiliary connecting rods 3 are used to support the hinges of the pedal segments 2, achieving a hard limit and preventing the pedal segments 2 that are already in a horizontal state from continuing to move downward, thereby completing the opening of the human ladder.

[0037] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A foldable ladder, characterized by: include A pair of hinged ladder frames, the ladder frames comprising a pair of parallel vertical poles and a plurality of pedals connected between the two vertical poles, the top ends of the vertical poles on the same side of the two ladder frames being hinged; The pedal comprises a pair of hinged pedal parts, and the other sides of the two pedal parts are hinged to two upright poles respectively; A vertical auxiliary connecting rod is also arranged between the two uprights of the same ladder frame. The auxiliary connecting rod is located at the hinge of the two pedal parts of the same pedal, and the auxiliary connecting rod is hinged to each pedal part. A notch is also provided on one side of the pedal part close to the auxiliary connecting rod to allow the auxiliary connecting rod to pass through and move up and down. When in the folded state, the two pedals of the same pedal are separated and arranged in an inverted V shape; When in use, the two pedals of the same pedal are distributed in a straight line, and the bottom end of the auxiliary connecting rod is flush with the bottom end of the vertical rod.

2. The foldable ladder according to claim 1, characterized in that: The pedal body is an inverted U-shaped structure consisting of a top plate located on the upper side and side plates connected to both sides of the top plate and extending vertically downward. The cross section of the top plate is arc-shaped, and the arc-shaped opening of the top plate faces downward.

3. The foldable ladder according to claim 2, characterized in that: A plurality of first reinforcing rib plates extending along the long axis direction of the top plate are also arranged on the bottom surface of the top plate.

4. The foldable ladder according to claim 1, characterized in that: The vertical pole is a C-shaped channel steel structure, and the C-shaped openings of the two vertical poles of the same ladder frame are relatively distributed. A plurality of second reinforcing rib plates extending along the long axis direction of the vertical pole are also arranged on the inner wall of the vertical pole.

Images