Portable herringbone ladder

Abstract

The utility model discloses a portable herringbone ladder, belongs to the field of ladders, and aims to improve the overall stability of the herringbone ladder. The front side and the rear side of the left side ladder and the front side and the rear side of the right side ladder are respectively provided with anti-inclination supporting legs, the top ends of the anti-inclination supporting legs are connected to the supporting legs of the herringbone ladder body, and the bottom ends of the anti-inclination supporting legs extend outwards in an inclined manner; pull rods are arranged between the anti-inclination supporting legs and the supporting legs, one ends of the pull rods are connected to the bottoms of the supporting legs of the herringbone ladder body, and the other ends of the pull rods are connected to the bottoms of the anti-inclination supporting legs. Four anti-inclination supporting legs are additionally arranged on the basis of a traditional herringbone ladder, so that the number of supporting point positions is increased; moreover, the bottom ends of the anti-tipping supporting legs extend outwards in an inclined manner, namely, the points, in contact with the ground, of the four supporting legs are surrounded in a square area defined by the points, in contact with the ground, of the anti-tipping supporting legs, so that the range of the points in contact with the ground is expanded, the supporting stability is better, and the effect of preventing the herringbone ladder from tipping is better. The triangular frame is defined by the supporting legs, the anti-tilting supporting legs and the pull rods, the stability is good, and the supporting reliability of the anti-tilting supporting legs is better improved.

Description

Technical Field

[0001] The utility model belongs to the field of ladders, in particular to a portable herringbone ladder. Background Art

[0002] The herringbone ladder is commonly used in the construction industry. The commonly used herringbone ladder is composed of a left ladder and a right ladder, and the herringbone ladder body is in the shape of a herringbone ladder. The herringbone ladder body includes support legs and steps between the support legs. That is, the left ladder includes two support legs arranged opposite to each other, and there are multiple steps distributed at equal intervals between the two support legs along the length extension direction. The right ladder is similar to the left ladder. In recent years, the domestic construction industry has frequently encountered safety accidents in the use of herringbone ladders in the construction of houses under construction, and has set restrictions and requirements for the use of herringbone ladders in narrow spaces. The reason is that it is found that such a herringbone ladder has no major problems when the staff is standing or sitting to operate the area directly above the herringbone ladder. However, for some narrow areas, the installation of the herringbone ladder is limited. After the herringbone ladder is installed, the staff often needs to lean out to the front or back of the herringbone ladder body to work. Many safety accidents that occurred at the construction site were caused by the staff leaning out to the front or back of the herringbone ladder body to work, causing the herringbone ladder to tip over. Utility Model Content

[0003] The utility model aims to provide a portable stepladder to improve the overall stability of the stepladder.

[0004] The technical scheme adopted by the utility model is: a portable herringbone ladder, a herringbone ladder body composed of a left ladder and a right ladder, the herringbone ladder body comprising supporting legs and steps between the supporting legs; anti-tilt legs are respectively arranged on the front side and the rear side of the left ladder and the front side and the rear side of the right ladder, the top ends of the anti-tilt legs are connected to the supporting legs of the herringbone ladder body, and the bottom ends are inclined and extended outward; a pull rod is arranged between the anti-tilt legs and the supporting legs of the herringbone ladder body, one end of the pull rod is connected to the bottom of the supporting legs of the herringbone ladder body, and the other end is connected to the bottom of the anti-tilt legs.

[0005] Furthermore, the anti-tilt leg is a telescopic rod, the top of which is hinged to the supporting leg; one end of the pull rod is hinged to the supporting leg of the ladder body, and the other end is hinged to the anti-tilt leg.

[0006] Furthermore, the anti-tilt leg includes a plug-in tube at the top and a receiving tube at the bottom, the bottom end of the plug-in tube is movably plugged into the receiving tube, and a locking structure is provided between the plug-in tube and the receiving tube to lock the relative positions of the two.

[0007] Furthermore, the locking structure is an adjusting bolt assembly.

[0008] Furthermore, the top of the anti-tilt leg and the supporting leg, the supporting leg and the pull rod, and the pull rod and the anti-tilt leg are all hinged via a hinge structure; the hinge structure includes a screw and a locking nut;

[0009] A through hole is provided at the top of the anti-tilt support leg and penetrates in the radial direction. One end of the screw is fixed to the outer wall of the support leg, and the other end passes through the through hole and is threadedly connected with the locking nut.

[0010] Both ends of the tie rod are respectively provided with through holes penetrating in the radial direction. Between the tie rod and the anti-tilt leg, one end of the screw is fixed to the outer wall of the anti-tilt leg, and the other end passes through the through hole at the outer end of the tie rod and is threadedly connected with the locking nut.

[0011] Between the pull rod and the support leg, one end of the screw rod is fixed to the outer wall of the support leg, and the other end passes through the through hole at the inner end of the pull rod and is threadedly connected with the locking nut. The beneficial effects of the utility model are as follows: the portable stepladder disclosed by the utility model adds four anti-tilt legs on the basis of the traditional stepladder, and the bottom ends of the four support legs can be supported on the ground at the same time, thereby increasing the support points; furthermore, the bottom ends of the anti-tilt legs extend outwardly at an angle, that is, the square area formed by the points where the four support legs contact the ground surrounds the points where the four support legs contact the ground, diversifying the range of the points where the ground is contacted, thus providing better support stability and preventing the stepladder from tipping over. The pull rod is connected between the support leg and the anti-tilt leg, and a triangular frame is formed by the support leg, the anti-tilt leg and the pull rod, which has good stability and is more conducive to improving the support reliability of the anti-tilt leg. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 This is the main view of the utility model

[0014] Figure 3 for Figure 1 A local enlarged view of point A;

[0015] Figure 4 for Figure 1 A partial enlarged view of point B.

[0016] In the figure, the step ladder body 1, the supporting legs 11, the steps 12, the anti-tilt legs 2, the plug-in tube 21, the receiving tube 22, the pull rod 3, the adjusting bolt assembly 4, the hinge structure 5, the screw rod 51, and the locking nut 52. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0018] The portable herringbone ladder, like the traditional herringbone ladder, comprises a herringbone ladder body 1 consisting of a left ladder and a right ladder, and the herringbone ladder body 1 comprises a support leg 11 and a step 12 between the support legs 11. That is, the left ladder comprises two support legs 11 arranged opposite to each other, and a plurality of steps 12 are evenly spaced between the two support legs 11 along the length extension direction thereof. The right ladder is similar to the left ladder. The left ladder and the right ladder form a herringbone ladder body 1 in a herringbone shape.

[0019] When a person faces the ladder body 1 , his left side corresponds to the left ladder and the right side corresponds to the right ladder; the front side is the front side of the ladder body 1 , which is also the front side of the left body and the right ladder; the rear side is the rear side of the ladder body 1 , which is also the rear side of the left body and the right ladder.

[0020] Such a stepladder is not a big problem when the worker is standing or sitting to operate the area directly above the stepladder. However, for some narrow areas, the installation of the stepladder is limited. After the stepladder is installed, the worker is often required to lean out to the front or back of the stepladder body 1 to work. There have been many accidents at construction sites where the stepladder tipped over and the worker fell because the worker leaned out to the front or back of the stepladder body 1 to work. In order to reduce the risk of the stepladder tipping over, the utility model has made the following improvements on the basis of the traditional stepladder:

[0021] Anti-tilt legs 2 are respectively arranged on the front and rear sides of the left ladder and the front and rear sides of the right ladder, the top ends of the anti-tilt legs 2 are connected to the supporting legs 11 of the stepladder body 1, and the bottom ends extend outward at an angle; a pull rod 3 is arranged between the anti-tilt legs 2 and the supporting legs 11 of the stepladder body 1, one end of the pull rod 3 is connected to the bottom of the supporting legs 11 of the stepladder body 1, and the other end is connected to the bottom of the anti-tilt legs 2.

[0022] The portable stepladder disclosed in the utility model is as follows Figure 1 and Figure 2 As shown, four anti-tilt legs 2 are added on the basis of the traditional stepladder, and the bottom ends of the four support legs 11 can be supported on the ground at the same time, thereby increasing the support points; furthermore, the bottom ends of the anti-tilt legs 2 are inclined to extend outward, that is, the square area formed by the points where the four support legs 11 contact the ground surrounds the points where the four support legs 11 contact the ground, diversifying the range of the points where the ground contact is spread, and the support stability is better, and the effect of preventing the stepladder from tipping over is better. The pull rod 3 is connected between the support leg 11 and the anti-tilt leg 2, and the support leg 11, the anti-tilt leg 2 and the pull rod 3 form a triangular frame, which has good stability and is more conducive to improving the support reliability of the anti-tilt leg 2.

[0023] To facilitate adjustment and storage, preferably, the anti-tilt leg 2 is a telescopic rod, and the top of the anti-tilt leg 2 is hinged to the support leg 11; one end of the pull rod 3 is hinged to the support leg 11 of the stepladder body 1, and the other end is hinged to the anti-tilt leg 2.

[0024] First, the anti-tilt leg 2 is shortened, one end of the pull rod 3 rotates around the support leg 11, and the other end rotates around the anti-tilt leg 2, so that the anti-tilt leg 2 and the pull rod 3 can be folded to the corresponding support leg 11. Compared with the traditional human-shaped font, the occupied space is not increased, which is convenient for storage and preservation. When in use, the anti-tilt leg 2 and the pull rod 3 can be opened.

[0025] Furthermore, for some uneven ground, such as ground with steps, after the stepladder body 1 is placed, the length of the anti-tilt legs 2 can be adjusted so that the anti-tilt legs 2 are supported on a ground different from the supporting surface of the stepladder body 1 to adapt to different ground surfaces and have good adaptability.

[0026] The anti-tilt legs 2 can be a retractable structure such as a hydraulic cylinder, a pneumatic cylinder, a scissor mechanism, etc. In order to simplify the structure, save costs, and facilitate the use of existing materials on the construction site to improve the traditional herringbone ladder, preferably, as Figure 3 As shown, the anti-tilt leg 2 includes a plug-in tube 21 at the top and a receiving tube 22 at the bottom, the bottom end of the plug-in tube 21 is movably plugged into the receiving tube 22, and a locking structure is provided between the plug-in tube 21 and the receiving tube 22 to lock the relative position of the two. The locking structure is an adjusting bolt assembly 4.

[0027] The top of the anti-tilt leg 2 and the support leg 11, the support leg 11 and the pull rod 3, and the pull rod 3 and the anti-tilt leg 2 can be connected by hinges, bearings, etc. Figure 4 As shown, the top of the anti-tilt leg 2 and the supporting leg 11, the supporting leg 11 and the tie rod 3, and the tie rod 3 and the anti-tilt leg 2 are all hinged via a hinge structure 5; the hinge structure 5 includes a screw 51 and a locking nut 52;

[0028] A through hole is provided at the top of the anti-tilt leg 2 and penetrates in the radial direction. One end of the screw 51 is fixed to the outer wall of the support leg 11, and the other end passes through the through hole and is threadedly connected with the locking nut 52.

[0029] Both ends of the tie rod 3 are respectively provided with through holes penetrating in the radial direction. Between the tie rod 3 and the anti-tilt leg 2, one end of the screw 51 is fixed to the outer wall of the anti-tilt leg 2, and the other end passes through the through hole at the outer end of the tie rod 3 and is threadedly connected with the locking nut 52;

[0030] Between the pull rod 3 and the support leg 11 , one end of the screw rod 51 is fixed to the outer wall of the support leg 11 , and the other end passes through the through hole at the inner end of the pull rod 3 and is threadedly connected to the locking nut 52 .

[0031] The hinge structure 5 composed of the screw rod 51 and the locking nut 52 has a simple structure, low cost, and is easy to obtain locally. When in use, the locking nut 52 is tightened to complete the locking. When it is necessary to fold, the locking nut 52 is loosened to enable the top of the anti-tilt leg 2 and the support leg 11, the support leg 11 and the pull rod 3, and the pull rod 3 and the anti-tilt leg 2 to rotate mutually, which is easy to operate.

[0032] Two identical traditional herringbone ladders are made of φ20×2mm steel pipes. One of the ladders is herringbone ladder A, and the other is herringbone ladder B.

[0033] Comparative example: When traditional stepladders were used directly for operations, two stepladder tipping accidents occurred within three months.

[0034] Embodiment: The conventional herringbone ladder used in the comparative example is improved: a φ20 steel pipe with a thickness of 2.0 mm is used as the plug-in pipe 21, a φ25 steel pipe with a thickness of 2.0 mm is used as the receiving pipe 22, and the two are connected and assembled into the anti-tilt support leg 2 using M5×40mm bolts. A φ20 steel pipe with a thickness of 2.0 mm is used as a pull rod, and an M5×40mm connecting bolt assembly is used to connect the pull rod, the anti-tilt support leg 2 and the support leg 11 to assemble the portable herringbone ladder disclosed in this utility model. The portable herringbone ladder is put into use, and there has been no herringbone ladder tipping accident in half a year.

Claims

1. A portable herringbone ladder, a herringbone ladder body (1) consisting of a left ladder and a right ladder, the herringbone ladder body (1) comprising a supporting leg (11) and a step (12) between the supporting leg (11); characterized in that: Anti-tilt legs (2) are respectively arranged on the front and rear sides of the left ladder and the front and rear sides of the right ladder, the top ends of the anti-tilt legs (2) are connected to the support legs (11) of the ladder body (1), and the bottom ends extend outwardly at an angle; a pull rod (3) is arranged between the anti-tilt legs (2) and the support legs (11) of the ladder body (1), one end of the pull rod (3) is connected to the bottom of the support legs (11) of the ladder body (1), and the other end is connected to the bottom of the anti-tilt legs (2).

2. The portable stepladder according to claim 1, characterized in that: The anti-tilt leg (2) is a telescopic rod, the top end of which is hinged to the support leg (11); one end of the pull rod (3) is hinged to the support leg (11) of the ladder body (1), and the other end is hinged to the anti-tilt leg (2).

3. The portable stepladder according to claim 2, characterized in that: The anti-tilt leg (2) comprises a plug-in tube (21) at the top and a receiving tube (22) at the bottom. The bottom end of the plug-in tube (21) is movably plugged into the receiving tube (22), and a locking structure is provided between the plug-in tube (21) and the receiving tube (22) for locking the relative positions of the two.

4. The portable stepladder according to claim 3, characterized in that: The locking structure is an adjusting bolt assembly (4).

5. The portable stepladder according to any one of claims 2 to 4, characterized in that: The top end of the anti-tilt leg (2) and the supporting leg (11), the supporting leg (11) and the pull rod (3), and the pull rod (3) and the anti-tilt leg (2) are all hingedly connected via a hinge structure (5); the hinge structure (5) comprises a screw rod (51) and a locking nut (52); A through hole is provided at the top of the anti-tilt leg (2) and penetrates in the radial direction. One end of the screw rod (51) is fixed to the outer wall of the support leg (11), and the other end passes through the through hole and is threadedly connected to the locking nut (52). Both ends of the pull rod (3) are respectively provided with through holes penetrating in the radial direction. Between the pull rod (3) and the anti-tilt leg (2), one end of the screw rod (51) is fixed to the outer wall of the anti-tilt leg (2), and the other end passes through the through hole at the outer end of the pull rod (3) and is threadedly connected to the locking nut (52); Between the pull rod (3) and the support leg (11), one end of the screw rod (51) is fixed to the outer wall of the support leg (11), and the other end passes through the through hole at the inner end of the pull rod (3) and is threadedly connected to the locking nut (52).

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