Herringbone ladder

Abstract

A herringbone ladder comprises first ladders and second ladders, the first ladders and the second ladders are arranged in a herringbone mode, the upper sides of the first ladders and the upper sides of the second ladders are hinged, the first ladders and the second ladders are both of telescopic structures and are matched and positioned through pin holes and pin shafts, long-strip-shaped grooves are formed in the inner sides, close to each other in the left-right direction, of first ladder beams, and movable pedals are arranged between the inner sides of the two first ladder beams. Sliding blocks are arranged on the left side and the right side of the movable pedal and matched with the long-strip-shaped grooves, a winch with three winding drums is arranged between the upper sides of the two first ladder beams, pull ropes of the winding drums on the left side and the right side penetrate into the long-strip-shaped grooves to be connected with the corresponding sliding blocks, and a tool box is hung on the pull rope of the winding drum in the middle. A plurality of transverse grooves are formed in the inner sides, close to each other in the left-right direction, of the second ladder beams, and loose joint pedals are inserted into the transverse grooves; and a connecting cross beam is arranged between the first ladder and the second ladder. The herringbone ladder is provided with the electrically-controlled movable pedals and the tool box, so that the ladder is labor-saving to go up and down, the stability and the safety are improved due to balanced stress, and the ladder beams are convenient to move and transport due to the telescopic structure.

Description

Technical Field

[0001] The utility model relates to a herringbone ladder. Background Art

[0002] A ladder is a device that supports construction workers while they work in the air. It is divided into two categories: straight ladders and herringbone ladders. Compared to straight ladders, herringbone ladders have the advantages of not requiring special support when in use and can be supported by themselves without the aid of other objects. Therefore, herringbone ladders are currently used for work. Existing herringbone ladders include a first ladder and a second ladder with the same structure. The first ladder and the second ladder are both composed of two symmetrical and inclined ladder beams, and a plurality of pedals arranged between the two ladder beams. The first ladder and the second ladder are arranged in a herringbone shape and are hinged on the upper side. For the specific structure, please refer to Chinese patent CN201710602035.6. The problem with existing herringbone ladders is that when using a herringbone ladder, the user's feet alternately step on the pedals when going up and down the ladder. This results in the force on the ladder beams on the left and right sides of the ladder being unbalanced when the user goes up and down the ladder, which leads to certain safety risks. In addition, when the user takes tools on the herringbone ladder, he needs to go up and down the ladder repeatedly, which is not only time-consuming and labor-intensive but also increases the risk. In addition, most herringbone ladders are large in size and difficult to move and transport. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a herringbone ladder, which is provided with an electrically controlled movable pedal and a tool box. Going up and down the ladder is not only labor-saving but also has improved stability and safety due to balanced force. The ladder beam adopts a telescopic structure, which can be easily moved and transported.

[0004] In order to solve the above technical problems, the utility model provides a herringbone ladder, comprising a first ladder and a second ladder, wherein the first ladder and the second ladder are arranged in a herringbone shape and are hinged at the upper side;

[0005] The first ladder comprises two first ladder beams that are symmetrical and inclinedly arranged on the left and right sides, and the first ladder beam comprises a first main beam and a first auxiliary beam, both of which are long strips. The first auxiliary beam is consistent with the length direction of the first main beam and is connected inside and outside. The lower side of the first auxiliary beam exceeds the first main beam and slides with the first main beam along its length direction. The two first auxiliary beams are provided with a plurality of first through holes along the outer sides away from each other in the left and right directions. The first through holes are arranged at equal intervals on the first auxiliary beam along its length direction. A second through hole is provided at the lower position of the first main beam corresponding to the first through hole. The second through hole is matched with one of the first through holes through a first pin that matches the two. The two first main beams and the two first auxiliary beams are provided with a long strip groove extending along the length direction of the first main beam and the first auxiliary beam on the inner sides close to each other in the left and right directions. The elongated slots have the same slot width and are interpenetrating with each other, and a horizontally arranged movable pedal is provided between the inner sides of the two first ladder beams, and sliders are provided on the left and right sides of the movable pedal that extend outward along the left and right directions of the movable pedal, and the sliders on either side of the movable pedal slide in cooperation with the elongated slots on the corresponding side, and a crossbeam is provided between the upper sides of the two first main beams, and a winch and a corresponding electric control component are provided on the crossbeam, and the winch is provided with three coaxial drums arranged at intervals on the left and right, and each drum is provided with a pull rope, wherein the drums at the left and right end portions are respectively opposite to the first ladder beams on both sides, and their corresponding pull ropes penetrate the elongated slots from the upper side of the first ladder beam on the corresponding side and extend downward along the elongated slots to be connected with the corresponding sliders, and the pull ropes corresponding to the drums in the middle extend vertically downward and a tool box is hung on it;

[0006] The second ladder comprises two second ladder beams that are symmetrical and inclinedly arranged, the second ladder beams comprising a second main beam and a second sub-beam, both of which are elongated strips, the second sub-beam being consistent in length direction with the second main beam and being connected inside and outside, the lower side of the second sub-beam extending beyond the second main beam and slidingly cooperating with the second main beam along its length direction, the two second sub-beams are each provided with a plurality of third through holes along the outer sides away from each other in the left and right directions, the third through holes are equidistantly arranged on the second sub-beam along its length direction, a fourth through hole is provided at a position corresponding to the third through hole at the lower position of the second main beam, the fourth through hole is engaged with one of the third through holes through a second pin cooperating with the two, the second main beam and the second sub-beam are each provided with a plurality of transverse grooves running forward and backward along the inner sides close to each other in the left and right directions, the transverse grooves on the second main beam and the second sub-beam are respectively equidistantly arranged along the length direction of the second main beam and the second sub-beam, and a movable pedal is inserted in the transverse groove;

[0007] A connecting crossbeam is provided between the first main beam and the second main beam located on the same side in the left and right directions.

[0008] For the purpose of simple explanation, the stepladder described in the present invention is referred to as a stepladder for short.

[0009] Advantages of the "I" ladder: The first step of the "I" ladder adopts an electrically controlled movable pedal. The user can stand on the movable pedal and the winch drives the user to go up and down the escalator. It not only saves labor but also improves stability and safety because the force on the two left and right ladder beams is balanced during the process. The winch is equipped with three coaxial drums arranged at intervals on the left and right. The drums at the left and right ends are used to drive the movable pedal. A tool box is hung on the drum in the middle position, so that the tools can go up and down synchronously with the user. There is no need to go up and down the escalator repeatedly to get the tools. It is more convenient to use and can improve work efficiency. The second rung of the ladder adopts the traditional pedal form, which can be used as a backup plan when the movable pedal fails. Moreover, the movable pedal on the second rung is connected to the horizontal groove, so that the interval between two adjacent pedals can be adjusted according to the user's usage habits (the vertical interval between adjacent horizontal grooves is small. When inserting the movable pedal, one movable pedal can be installed every n horizontal grooves. People with a small stride can use a smaller interval, and people with a larger stride can increase the interval). The ladder beams of the first and second rungs of the ladder adopt a telescopic structure, so that the height of the ladder can be adjusted as needed, and it is easy to move and transport when fully retracted.

[0010] In order to achieve better use of the ladder, the preferred solution is as follows:

[0011] Preferably, the lower parts of the first sub-beam and the second sub-beam are provided with foldable universal wheels.

[0012] The foldable universal wheels are convenient for quick pushing in a smaller range when unfolded. When in formal use, the universal wheels are retracted so that the lower parts of the first and second sub-beams directly contact the ground, increasing friction and making it more stable and safer when used. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the side view of my ladder.

[0014] Figure 2 It is a side sectional view of my ladder.

[0015] Figure 3 This is a schematic diagram of the winch structure of a personal ladder.

[0016] Figure 4 This is a schematic diagram of the coordination between the movable tread and the first ladder beam in a herringbone ladder. DETAILED DESCRIPTION

[0017] See also Figure 1-Figure 4 A herringbone ladder comprises a first ladder 1 and a second ladder 2, wherein the first ladder 1 and the second ladder 2 are arranged in a herringbone shape and are hinged at the upper side;

[0018] The first ladder 1 includes two first ladder beams 11 that are symmetrical and inclined. The first ladder beam 11 includes a first main beam 111 and a first sub-beam 112, both of which are long strips. The first sub-beam 112 is consistent with the length direction of the first main beam 111 and is connected inside and outside. The lower side of the first sub-beam 112 exceeds the first main beam 111 and slides with the first main beam 111 along its length direction. The two first sub-beams 112 are provided with a plurality of first through holes 113 along the outer sides away from each other in the left and right directions. The first through holes 113 are arranged at equal intervals on the first sub-beam 112 along its length direction. A second through hole 114 is provided at the lower position of the first main beam 111 corresponding to the first through hole 113. The second through hole 114 is matched with one of the first through holes 113 through a first pin 12 that matches the two (for simple explanation of the problem, Figure 2 The first pin 12 is not shown. Figure 4 The first pin 12 in the figure also only shows a conventional pin structure), the two first main beams 111 and the two first auxiliary beams 112 are close to each other in the left and right directions. The inner sides are provided with long strip grooves 13 extending along the length direction of the first main beam 111 and the first auxiliary beam 112 (in this embodiment, the first main beam 111 and the first auxiliary beam 112 adopt a square tube structure with a C-shaped cross-section). The long strip grooves 13 on the first main beam 111 and the first auxiliary beam 112 on the same side in the left and right directions are the same and penetrate each other. A horizontally arranged movable pedal 14 is provided between the inner sides of the two first ladder beams 11, and the movable pedal 14 is provided with a slider 15 extending outward along the movable pedal 14 in the left and right directions on both sides. The slider 15 on either side of the movable pedal 14 slides with the long strip groove 13 on the corresponding side. The two first main beams 111 and the first auxiliary beam 112 are close to each other in the left and right directions. A crossbeam 16 is provided between the upper sides of the beams 111, and a winch and a corresponding electronic control component are provided on the crossbeam 16 (in this embodiment, the electronic control component and the winch motor 17 are an integrated structure, which is an existing mature technology and will not be described in detail). The winch is provided with three coaxial drums 18 spaced apart on the left and right sides, and each drum 18 is provided with a pull rope (the pull ropes on the winch drums 18 in this embodiment are not shown), wherein the drums 181 located at the left and right ends are respectively opposite to the first ladder beams 11 on both sides, and their corresponding pull ropes 183 pass through the elongated groove 13 from the upper side of the first ladder beam 11 on the corresponding side and extend downward along the elongated groove 13 to connect with the corresponding slider 15, and the pull rope 184 corresponding to the drum 182 located in the middle extends vertically downward and is hung with a tool box 185;

[0019] The second ladder 2 includes two second ladder beams 21 that are symmetrical and inclined. The second ladder beam 21 includes a second main beam 211 and a second sub-beam 212, both of which are long strips. The second sub-beam 212 is consistent with the second main beam 211 in length direction and is connected inside and outside. The lower side of the second sub-beam 212 exceeds the second main beam 211 and slides with the second main beam 211 along its length direction. The two second sub-beams 212 are provided with a plurality of third through holes 213 along the outer sides away from each other in the left and right directions. The third through holes 213 are arranged at equal intervals on the second sub-beam 212 along its length direction. A fourth through hole 214 is provided at the lower position of the second main beam 211 corresponding to the third through holes 213. The fourth through hole 214 is matched with one of the third through holes 213 through a second pin that matches the two (the second pin and the first pin have similar structures and are both existing mature technologies. For the sake of simple explanation, they are not introduced in detail here). (Introduction), the second main beam 211 and the second auxiliary beam 212 are provided with a plurality of front-to-rear transverse grooves 22 along the inner sides close to each other in the left and right directions, and the transverse grooves 22 on the second main beam 211 and the second auxiliary beam 212 are respectively arranged at equal intervals along the length direction of the second main beam 211 and the second auxiliary beam 212 (in this embodiment, the second main beam 211 and the second auxiliary beam 212 both adopt a conventional square tube structure for inner and outer connection, and the transverse grooves are all provided at the wall thickness position of the square tube. This is a conventional structure and a structural schematic diagram is not provided separately). A movable pedal 23 is inserted in the transverse groove 22 (the distance between the second main beam 211 and the second auxiliary beam 212 is different, so the length of the corresponding movable pedal 23 should also remain corresponding). It is also noted that in order to make the movable pedal 23 more stable in use, an anti-slip pad can be provided at the joint between the movable pedal 23 and the transverse groove 22 to increase friction and prevent relative movement between the two during use.

[0020] A connecting crossbeam 3 is provided between the first main beam 111 and the second main beam 211 located on the same side in the left and right directions.

[0021] The lower parts of the first auxiliary beam 112 and the second auxiliary beam 212 are provided with foldable universal wheels 4 .

[0022] Advantages of the "personal ladder": The first step 1 of the "personal ladder" adopts an electrically controlled movable pedal 14. The user can stand on the movable pedal 14 and complete the movement of going up and down the escalator driven by a winch, which not only saves labor but also improves stability and safety because the ladder beams on the left and right sides are under balanced force during the process. The winch is provided with three coaxial drums 18 arranged at intervals on the left and right. The drums 181 at the left and right ends are used to drive the movable pedal 14. A tool box 185 is hung on the drum 182 in the middle position, so that the tools can go up and down synchronously with the user, and there is no need to go up and down the escalator repeatedly to get the tools. It is more convenient to use and can improve work efficiency. The second step 2 of the "personal ladder" adopts a traditional pedal form. When the movable pedal 14 fails, As a backup plan, the movable pedal 23 on the second ladder 2 is connected to the transverse groove 22, so that the interval between two adjacent pedals can be adjusted according to the user's usage habits (the vertical interval between adjacent transverse grooves 22 is small. When inserting the movable pedal 23, one movable pedal 23 can be installed every n transverse grooves 22. People with a small stride can have a smaller interval, and people with a larger stride can have a larger interval. In order to simply illustrate the problem, only part of the transverse grooves 22 are drawn as a schematic in the drawings of this embodiment. The density of the actual transverse grooves can be denser to facilitate the adjustment of the interval between the movable pedals 23). The ladder beams of the first ladder 1 and the second ladder 2 of the human-shaped ladder both adopt a telescopic structure, so that the height of the ladder can be adjusted as needed, and it is easy to move and transport after being fully retracted.

[0023] When the foldable universal wheel 4 is in the unfolded state, it is convenient to push it quickly within a smaller range. When it is officially used, the universal wheel 4 is retracted so that the lower parts of the first sub-beam 112 and the second sub-beam 212 directly contact the ground, increasing friction and making it more stable and safer when used (the foldable universal wheel 4 is an existing mature product, and its structure is not described in detail in this embodiment).

Claims

1. A herringbone ladder comprising a first ladder and a second ladder, wherein the first ladder and the second ladder are arranged in a herringbone shape and hinged at the upper side, characterized in that: The first ladder comprises two first ladder beams that are symmetrical and inclinedly arranged on the left and right sides, and the first ladder beam comprises a first main beam and a first auxiliary beam, both of which are long strips. The first auxiliary beam is consistent with the length direction of the first main beam and is connected inside and outside. The lower side of the first auxiliary beam exceeds the first main beam and slides with the first main beam along its length direction. The two first auxiliary beams are provided with a plurality of first through holes along the outer sides away from each other in the left and right directions. The first through holes are arranged at equal intervals on the first auxiliary beam along its length direction. A second through hole is provided at the lower position of the first main beam corresponding to the first through hole. The second through hole is matched with one of the first through holes through a first pin that matches the two. The two first main beams and the two first auxiliary beams are provided with a long strip groove extending along the length direction of the first main beam and the first auxiliary beam on the inner sides close to each other in the left and right directions. The elongated slots have the same slot width and are interpenetrating with each other, and a horizontally arranged movable pedal is provided between the inner sides of the two first ladder beams, and sliders are provided on the left and right sides of the movable pedal that extend outward along the left and right directions of the movable pedal, and the sliders on either side of the movable pedal slide in cooperation with the elongated slots on the corresponding side, and a crossbeam is provided between the upper sides of the two first main beams, and a winch and a corresponding electric control component are provided on the crossbeam, and the winch is provided with three coaxial drums arranged at intervals on the left and right, and each drum is provided with a pull rope, wherein the drums at the left and right end portions are respectively opposite to the first ladder beams on both sides, and their corresponding pull ropes penetrate the elongated slots from the upper side of the first ladder beam on the corresponding side and extend downward along the elongated slots to be connected with the corresponding sliders, and the pull ropes corresponding to the drums in the middle extend vertically downward and a tool box is hung on it; The second ladder comprises two second ladder beams that are symmetrical and inclinedly arranged, the second ladder beams comprising a second main beam and a second sub-beam, both of which are elongated strips, the second sub-beam being consistent in length direction with the second main beam and being connected inside and outside, the lower side of the second sub-beam extending beyond the second main beam and slidingly cooperating with the second main beam along its length direction, the two second sub-beams are each provided with a plurality of third through holes along the outer sides away from each other in the left and right directions, the third through holes are equidistantly arranged on the second sub-beam along its length direction, a fourth through hole is provided at a position corresponding to the third through hole at the lower position of the second main beam, the fourth through hole is engaged with one of the third through holes through a second pin cooperating with the two, the second main beam and the second sub-beam are each provided with a plurality of transverse grooves running forward and backward along the inner sides close to each other in the left and right directions, the transverse grooves on the second main beam and the second sub-beam are respectively equidistantly arranged along the length direction of the second main beam and the second sub-beam, and a movable pedal is inserted in the transverse groove; A connecting crossbeam is provided between the first main beam and the second main beam located on the same side in the left and right directions.

2. The stepladder according to claim 1, characterized in that: The lower parts of the first auxiliary beam and the second auxiliary beam are provided with foldable universal wheels.

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