A ladder with a stable structure

Abstract

A type of A-frame ladder with a stable structure includes two symmetrically arranged straight ladders. The upper ends of the two ladders are hinged together, and two auxiliary stabilizing devices are respectively installed below the two ladders. Each auxiliary stabilizing device includes a main frame and a secondary frame. The main frame is rotatably connected to the lower end of the ladder. Rotary shafts are detachably connected to both sides of the main frame. Rotary connection holes corresponding to the rotating shafts are opened on both sides of the bottom of the ladder. The two rotating shafts are respectively inserted into the two rotating connection holes. A limiting device is connected between the main frame and the ladder to limit the position of the main frame. The secondary frame is hinged to the outer end of the main frame, and a connecting lug is connected to the inner side of the secondary frame. A first auxiliary rod and a second auxiliary rod are also connected to the main frame. When in use, by unfolding the main frame and the secondary frame and installing the first and second auxiliary rods, the stability is improved through the auxiliary support provided by the main frame, the secondary frame, the first auxiliary rod, and the second auxiliary rod.

Description

Technical Field

[0001] This utility model relates to a ladder, specifically an A-frame ladder with a stable structure. Background Technology

[0002] A-frame ladders are climbing tools that form an isosceles triangle structure with the ground, utilizing the stability principle of triangles to achieve load-bearing function. Their development has evolved from traditional wood to aluminum alloy materials, and modern mainstream products combine lightweight and high load-bearing characteristics (135-150kg). They are mainly divided into two categories: fixed and movable. Movable ladders can be folded and stored through a hinge mechanism and are suitable for work above flat spaces such as home cleaning and decoration construction.

[0003] Existing A-frame ladders generally consist of two symmetrically arranged straight ladders hinged at the top. When in use, the two ladders are opened, and the ladders are supported only by their lower ends. Therefore, their stability needs to be improved. If the A-frame ladder tipps over during use, it can easily cause injury to the user. Therefore, a more stable A-frame ladder is what we need. Utility Model Content

[0004] The purpose of this invention is to solve the technical problem of providing a more stable A-frame ladder.

[0005] To solve the above-mentioned technical problems, the present invention provides a technical solution for a stably structured A-frame ladder as follows:

[0006] The system includes two symmetrically arranged straight ladders; the upper ends of the two ladders are hinged together, and it also includes two auxiliary stabilizing devices installed below the two ladders respectively; each auxiliary stabilizing device includes a main frame and a secondary frame; the main frame is rotatably connected to the lower end of the ladder; both sides of the main frame are detachably connected to rotating shafts; both sides of the bottom of the ladder have rotating connection holes corresponding to the rotating shafts; the two rotating shafts are respectively inserted into the two rotating connection holes; a limiting device is connected between the main frame and the ladder to limit the position of the main frame; the secondary frame is hinged to the outer end of the main frame, and a connecting lug is connected to the inner side of the secondary frame; a first auxiliary rod and a second auxiliary rod are also connected to the main frame; one end of the first auxiliary rod is connected to a first limiting block, and the other end has a first threaded connection hole; the second auxiliary rod... One end of the rod is connected to a second limiting block, and the other end is connected to a first threaded connecting rod that matches the first threaded connecting hole; one side of the main frame is connected to a second threaded connecting rod corresponding to the first threaded connecting hole, and the other side is connected to a threaded rod sleeve corresponding to the first threaded connecting rod; when the auxiliary stabilizing device is not in use, the main frame and the sub-frame are folded onto the straight ladder, and the second auxiliary rod and the first threaded connecting rod pass through the main frame and the straight ladder and are threadedly connected to the first threaded connecting hole of the first auxiliary rod; when the auxiliary stabilizing device is in use, the main frame and the sub-frame are unfolded, and the connecting lug on the sub-frame is connected to the main frame by bolts, the first auxiliary rod is screwed onto the second threaded connecting rod through the first threaded connecting hole, and the second auxiliary rod is threadedly connected to the threaded rod sleeve through the first threaded connecting rod.

[0007] The outer end of the rotating shaft is connected to a mounting plate; the mounting plate is connected to the main frame by bolts.

[0008] The limiting device includes a limiting bolt and a locking nut; both sides of the bottom of the straight ladder are provided with arc-shaped limiting grooves coaxial with the rotating connection hole; the bottom end of the limiting bolt passes through the mounting plate, the main frame and the arc-shaped limiting groove and is threadedly connected to the locking nut.

[0009] The limiting device includes two limiting bolts and two locking nuts. The two limiting bolts pass through the mounting plate, the main frame, and the arc-shaped limiting groove and are threadedly connected to the two locking nuts respectively.

[0010] A limit band connects the two straight ladders.

[0011] The technical effects that this utility model can achieve are:

[0012] 1. When using this utility model, by unfolding the main frame and the sub-frame, and installing the first auxiliary rod and the second auxiliary rod, the main frame, the sub-frame, the first auxiliary rod and the second auxiliary rod are used for auxiliary support, which makes it more stable;

[0013] 2. When this utility model is not in use, the main frame and the sub-frame can be folded onto a straight ladder, and the first threaded connecting rod of the second auxiliary rod passes through the main frame and the straight ladder and is threadedly connected to the first threaded connecting hole of the first auxiliary rod. In this way, the auxiliary stabilizing device occupies a small area when not in use.

[0014] 3. The auxiliary stabilizing device of this utility model is connected to the straight ladder through the main frame, and the main frame is detachably connected to the straight ladder. Therefore, the auxiliary stabilizing device of this utility model can be installed according to needs, and when not needed, the auxiliary stabilizing device can be directly removed from the straight ladder. Attached Figure Description

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0016] Figure 1 This is a structural diagram of a staggered ladder with a stable structure according to the present invention (when the auxiliary stabilizing device is in use);

[0017] Figure 2 yes Figure 1 Enlarged view of part A;

[0018] Figure 3 yes Figure 2 Enlarged view of part B;

[0019] Figure 4 yes Figure 2 Enlarged view of part C;

[0020] Figure 5 This is a structural diagram of a staggered ladder with a stable structure according to the present invention (when the auxiliary stabilizing device is not in use);

[0021] Figure 6 yes Figure 5 Enlarged view of part D;

[0022] Figure 7 yes Figure 6 Enlarged view of part E;

[0023] Figure 8 This is an exploded view of an A-frame ladder with a stable structure according to this utility model;

[0024] Figure 9 yes Figure 8 Enlarged view of part F;

[0025] Figure 10 This is a cross-sectional view of an A-frame ladder with a stable structure according to the present invention;

[0026] Figure 11 yes Figure 10 Enlarged view of part G;

[0027] Figure 12 yes Figure 10 Enlarged view of section H. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings.

[0029] See Figures 1 to 12 .

[0030] A type of A-frame ladder with a stable structure includes two symmetrically arranged straight ladders 1, with their upper ends hinged together. Specifically, a limiting band 41 connects the two straight ladders 1. It also includes two auxiliary stabilizing devices installed below the two straight ladders 1. Each auxiliary stabilizing device includes a main frame 2 and a secondary frame 3. The main frame 2 is rotatably connected to the lower end of the straight ladder 1. A pivot 4 is detachably connected to both sides of the main frame 2. Rotary connection holes 5 corresponding to the pivot 4 are provided on both sides of the bottom of the straight ladder 1. The two pivot 4 are respectively inserted into the two rotary connection holes 5. Specifically, the pivot... The outer end of the shaft 4 is connected to a mounting plate 21, which is connected to the main frame 2 by bolts. The auxiliary stabilizing device of this utility model is installed on the straight ladder 1 through the main frame 2, and the main frame 2 is rotatably connected to the straight ladder 1 through the rotating shaft 4. Specifically, the rotating shaft 4 is connected to the main frame 2 through the mounting plate 21 at its outer end, and the mounting plate 21 is connected to the main frame 2 by bolts. Therefore, when it is necessary to disassemble the auxiliary stabilizing device, the bolts between the mounting plate 21 and the main frame 2 can be unscrewed, and then the auxiliary stabilizing device and the rotating shaft 4 can be disassembled, which is relatively convenient.

[0031] A limiting device is connected between the main frame 2 and the straight ladder 1 to limit the movement of the main frame 2. Specifically, the limiting device includes a limiting bolt 31 and a locking nut 32. Both sides of the bottom of the straight ladder 1 have arc-shaped limiting grooves 33 coaxial with the rotating connection hole 5. The bottom end of the limiting bolt 31 passes through the mounting plate 21, the main frame 2, and the arc-shaped limiting groove 33, and is threadedly connected to the locking nut 32. More specifically, the limiting device includes two limiting bolts 31 and two locking nuts 32, with both limiting bolts 31 passing through the mounting plate. 21. The main frame 2 and the arc-shaped limiting groove 33 are respectively threadedly connected to two locking nuts 32. In terms of limiting the main frame 2, the main frame 2 is first rotated to the required angle, and then the two locking nuts 32 are tightened to lock the main frame 2 onto the straight ladder 1. When disassembling the auxiliary stabilizing device, the locking nuts 32 also need to be unscrewed, and then the limiting bolts 31 are removed from the mounting plate 21, the main frame 2 and the arc-shaped limiting groove 33, so that the auxiliary stabilizing device and the rotating shaft 4 can be disassembled.

[0032] The sub-frame 3 is hinged to the outer end of the main frame 2, and the inner side of the sub-frame 3 is connected to the connecting lug 6; the main frame 2 is also connected to the first auxiliary rod 7 and the second auxiliary rod 8; one end of the first auxiliary rod 7 is connected to the first limiting block 9, and the other end is provided with the first threaded connecting hole 10; one end of the second auxiliary rod 8 is connected to the second limiting block 11, and the other end is connected to the first threaded connecting rod 12 that matches the first threaded connecting hole 10; one side of the main frame 2 is connected to the second threaded connecting rod 13 corresponding to the first threaded connecting hole 10, and the other side is connected to the threaded rod sleeve 14 corresponding to the first threaded connecting rod 12.

[0033] When this utility model is used as an auxiliary stabilizing device (see reference) Figure 1 , 2 (3, 4, 10, 11, 12), the main frame 2 and the sub-frame 3 are unfolded, and the connecting lug 6 on the sub-frame 3 is connected to the main frame 2 by bolts. The first auxiliary rod 7 is screwed onto the second threaded connecting rod 13 through the first threaded connecting hole 10, and the second auxiliary rod 8 is threaded onto the threaded rod sleeve 14 through the first threaded connecting rod 12. At this time, the present invention is supported on the ground by the first auxiliary rod 7, the second auxiliary rod 8, the main frame 2 and the sub-frame 3, and its stability is better.

[0034] When the auxiliary stabilizing device is not in use (see reference) Figure 5 , 6 7), the main frame 2 and the auxiliary frame 3 are folded on the straight ladder 1, and the first threaded connecting rod 12 of the second auxiliary rod 8 passes through the main frame 2 and the straight ladder 1 and is threadedly connected to the first threaded connecting hole 10 of the first auxiliary rod 7; through the above-mentioned storage method, the auxiliary stabilizing device occupies a smaller area.

Claims

1. A type of A-frame ladder with a stable structure, comprising two symmetrically arranged straight ladders (1); the upper ends of the two straight ladders (1) are hinged together, characterized in that: It also includes two auxiliary stabilizing devices installed below the two straight ladders (1); the auxiliary stabilizing devices include a main frame (2) and a sub-frame (3); the main frame (2) is rotatably connected to the lower end of the straight ladder (1); both sides of the main frame (2) are detachably connected to rotating shafts (4); both sides of the bottom of the straight ladder (1) are provided with rotating connection holes (5) corresponding to the rotating shafts (4); the two rotating shafts (4) are respectively inserted into the two rotating connection holes (5); the main frame (2) and A limiting device is connected between the straight ladders (1) to limit the position of the main frame (2); the sub-frame (3) is hinged to the outer end of the main frame (2), and a connecting lug (6) is connected to the inner side of the sub-frame (3); a first auxiliary rod (7) and a second auxiliary rod (8) are also connected to the main frame (2); one end of the first auxiliary rod (7) is connected to a first limiting block (9), and the other end is provided with a first threaded connection hole (10); one end of the second auxiliary rod (8) is connected to a second limiting block (11), and the other end is connected to... There is a first threaded connecting rod (12) that matches the first threaded connecting hole (10); the main frame (2) is connected to a second threaded connecting rod (13) corresponding to the first threaded connecting hole (10) on one side, and to a threaded rod sleeve (14) corresponding to the first threaded connecting rod (12) on the other side; when the auxiliary stabilizing device is not in use, the main frame (2) and the sub-frame (3) are folded on the straight ladder (1), and the first threaded connecting rod (12) of the second auxiliary rod (8) passes through the main frame (2) and the straight ladder (1) and is threadedly connected to the first threaded connecting hole (10) of the first auxiliary rod (7); when the auxiliary stabilizing device is in use, the main frame (2) and the sub-frame (3) are unfolded, and the connecting lug (6) on the sub-frame (3) is connected to the main frame (2) by bolts, the first auxiliary rod (7) is screwed onto the second threaded connecting rod (13) through the first threaded connecting hole (10), and the second auxiliary rod (8) is threadedly connected to the threaded rod sleeve (14) through the first threaded connecting rod (12).

2. The A-frame ladder with a stable structure according to claim 1, characterized in that: The outer end of the rotating shaft (4) is connected to a mounting plate (21); the mounting plate (21) is connected to the main frame (2) by bolts.

3. The A-frame ladder with a stable structure according to claim 2, characterized in that: The limiting device includes a limiting bolt (31) and a locking nut (32); both sides of the bottom of the straight ladder (1) are provided with arc-shaped limiting grooves (33) coaxial with the rotating connection hole (5); the bottom end of the limiting bolt (31) passes through the mounting plate (21), the main frame (2) and the arc-shaped limiting groove (33) and is threadedly connected to the locking nut (32).

4. The A-frame ladder with a stable structure according to claim 3, characterized in that: The limiting device includes two limiting bolts (31) and two locking nuts (32). The two limiting bolts (31) pass through the mounting plate (21), the main frame (2) and the arc-shaped limiting groove (33) and are threadedly connected to the two locking nuts (32).

5. A-frame ladder with a stable structure according to claim 1, characterized in that: A limiting band (41) is connected between the two straight ladders (1).

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