Limiting and reinforcing device of herringbone ladder

Abstract

The utility model discloses a limiting and reinforcing device of a herringbone ladder. The limiting and reinforcing device comprises fixing mechanisms and a limiting mechanism, wherein the fixing mechanisms are respectively arranged on two ladder frames; the limiting mechanism is connected with the two fixing mechanisms and is adjustable in length; the fixing mechanism comprises a U-shaped frame arranged on a pedal transverse rod of the ladder assembly, one end of the U-shaped frame hooks the pedal transverse rod, and the outer side of the other end of the U-shaped frame is hinged to one end of the limiting mechanism. The herringbone ladder has the advantages that the two ladder frames are stably connected through the fixing mechanism and the limiting mechanism, the unfolding angle of the ladder frames is limited, the fixing mechanism can adapt to pedal cross rods with different thicknesses, the limiting mechanism can adapt to herringbone ladders with different unfolding angles, and therefore the applicability of the herringbone ladder is wider.

Description

Technical Field

[0001] The utility model relates to the technical field of climbing tools, in particular to a limiting reinforcement device for a stepladder. Background Art

[0002] Folding stepladders are very common in life. They are generally composed of two symmetrical ladder frames, which include a main vertical bar and a footrest horizontal bar. Common folding stepladders usually only use a rope to connect the two ladder frames to control the expansion angle of the stepladder. However, the rope is relatively soft and easy to loosen, which may cause the stepladder to over-expand. In addition, the rope is prone to wear and aging. There are safety accidents caused by the above reasons in life. Therefore, this limiting method has safety hazards. A stepladder limit reinforcement device is urgently needed to solve this problem. Utility Model Content

[0003] In order to overcome the problem of potential safety hazards in the existing limiting technology for controlling the unfolding angle of a common folding stepladder, the utility model provides a limiting reinforcement device for a stepladder. The technical solution is as follows:

[0004] A limiting reinforcement device for a stepladder comprises fixing mechanisms respectively arranged on two ladder frames and a limiting mechanism connecting the two fixing mechanisms and capable of adjusting the length; the fixing mechanism comprises a U-shaped frame arranged on a footrest crossbar of the ladder frame, one end of the U-shaped frame hooks the footrest crossbar, and the outer side of the other end of the U-shaped frame is hinged to one end of the limiting mechanism.

[0005] Furthermore, one end of the U-shaped frame close to the limiting mechanism is threaded with a fixing screw, and one end of the fixing screw passes through the interior of the U-shaped frame and can rest against one side of the footrest cross bar. Through the adjustment action of the fixing screw, the U-shaped frame of the device can be fixed on footrest cross bars of different thicknesses, thereby making the device adaptable to different herringbone ladders.

[0006] Furthermore, the limiting mechanism includes two connecting inner rods hinged together at one end, and the other end of the connecting inner rod is slidably set in a connecting tube, the other end of the connecting tube is hinged to the U-shaped frame, and the connecting inner rod is provided with a plurality of positioning holes along the length direction, and a positioning screw rod 2 matching the positioning hole is threadedly provided on the connecting tube, one end of the positioning screw rod 2 passes through the interior of the connecting tube and can be inserted into the positioning hole, and the limiting mechanism can adjust the length to adapt to different deployment angles, thereby increasing the applicability of the device.

[0007] Furthermore, a top plate is rotatably provided at one end of the fixing screw rod located inside the U-shaped frame, and the top plate can abut against a side surface of the footrest cross bar.

[0008] Furthermore, there are two fixing screws which are symmetrically arranged on both sides of the U-shaped frame.

[0009] Furthermore, a bottom plate is rotatably provided at one end of the opening of the U-shaped frame, and the other end of the bottom plate is fixedly connected to the other end of the opening of the U-shaped frame by bolts, and the bottom plate can prevent the U-shaped frame from falling off the footrest cross bar.

[0010] Furthermore, a through groove is formed at one end of the connecting tube close to the U-shaped frame, and an ear plate is provided on an outer side surface of the U-shaped frame close to the limiting mechanism, and the ear plate is located in the through groove and hinged thereto.

[0011] Furthermore, the cross-sections of the connecting tube and the connecting inner rod are both rectangular, and the rectangular cross-section can prevent the connecting inner rod from rotating when moving in the connecting tube, thereby making it difficult to insert the positioning screw rod 2 into the positioning hole.

[0012] The beneficial effect of the technical solution provided by the utility model is that the device not only stably connects the two ladder frames through the fixing mechanism and the limiting mechanism to limit the expansion angle thereof, but also the fixing mechanism can adapt to footrest cross bars of different thicknesses, and the limiting mechanism can adapt to herringbone ladders of different expansion angles, thereby making the device more widely applicable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following is a brief introduction to the drawings used in the embodiments. Obviously, the drawings listed below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0015] Figure 2 yes Figure 1 A magnified schematic diagram of the structure at center A;

[0016] Figure 3 It is a schematic diagram of the use status of an embodiment of the utility model.

[0017] In the attached drawings, the components represented by the various reference numerals are listed as follows: 1. Ladder frame; 2. Fixing mechanism; 201. U-shaped frame; 202. Fixing screw 1; 203. Top plate; 204. Ear plate; 205. Bottom plate; 3. Limiting mechanism; 301. Connecting inner rod; 302. Connecting tube; 303. Positioning hole; 304. Positioning screw 2; 4. Footrest cross bar. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] See also Figures 1 to 3 The embodiment of the utility model provides a limiting reinforcement device for a stepladder, including a fixing mechanism 2 respectively arranged on two ladder frames 1 and a limiting mechanism 3 connecting the two fixing mechanisms 2 and having an adjustable length; the fixing mechanism 2 includes a U-shaped frame 201 arranged on the footrest crossbar 4 of the ladder frame 1, one end of the U-shaped frame 201 hooks the footrest crossbar 4, and the outer side of the other end of the U-shaped frame 201 is hinged to one end of the limiting mechanism 3.

[0020] One end of the U-shaped frame 201 close to the limiting mechanism 3 is threaded with a fixing screw 202 , and one end of the fixing screw 202 penetrates into the interior of the U-shaped frame 201 and can abut against one side of the footrest crossbar 4 .

[0021] The limiting mechanism 3 includes two connecting inner rods 301 hinged together at one end, and the other end of the connecting inner rod 301 is slidably set in a connecting tube 302, the other end of the connecting tube 302 is hinged to the U-shaped frame 201, and the connecting inner rod 301 is provided with a plurality of positioning holes 303 along the length direction, and the connecting tube 302 is threaded with a positioning screw 304 matching the positioning hole 303, and one end of the positioning screw 304 passes through the interior of the connecting tube 302 and can be inserted into the positioning hole 303.

[0022] A top plate 203 is rotatably provided at one end of the fixing screw rod 202 located inside the U-shaped frame 201 , and the top plate 203 can abut against a side surface of the footrest cross bar 4 .

[0023] There are two fixing screws 202 symmetrically arranged on both sides of the U-shaped frame 201 .

[0024] A bottom plate 205 is rotatably disposed at one end of the opening of the U-shaped frame 201 , and the other end of the bottom plate 205 is fixedly connected to the other end of the opening of the U-shaped frame 201 by bolts.

[0025] A through slot is formed at one end of the connecting tube 302 close to the U-shaped frame 201 , and an ear plate 204 is provided on an outer side of the U-shaped frame 201 close to the limiting mechanism 3 . The ear plate 204 is located in the through slot and is hinged thereto.

[0026] The cross sections of the connecting tube 302 and the connecting inner rod 301 are both rectangular.

[0027] Instructions for use: When using the device, first rotate the bottom plate 205, hook the two U-shaped frames 201 onto the footrest crossbars 4 on the two ladder frames 1 respectively, then rotate the fixing screw 1 202 to make the top plate 203 tightly press against one side of the footrest crossbar 4, thereby fixing the position of the U-shaped frame 201, then rotate the bottom plate 205 to close the U-shaped frame 201, and fix it with bolts, and then adjust the position of the connecting inner rod 301 in the connecting tube 302 by the positioning screw 2 304 according to the required expansion angle, and insert the positioning screw 2 304 into the positioning hole 303 for positioning, thereby fixing the length of the limiting mechanism 3, and then fixing the maximum expansion angle of the ladder; when the ladder is stored, the two connecting inner rods 301 hinged together at one end are rotated around the hinge axis to be stored and folded.

[0028] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A limiting reinforcement device for a stepladder, characterized in that: It comprises fixing mechanisms (2) respectively arranged on two ladder frames (1) and a limiting mechanism (3) connecting the two fixing mechanisms (2) and having an adjustable length; The fixing mechanism (2) comprises a U-shaped frame (201) arranged on the footrest crossbar (4) of the ladder frame (1), one end of the U-shaped frame (201) hooks the footrest crossbar (4), and the outer side of the other end of the U-shaped frame (201) is hinged to one end of the limiting mechanism (3).

2. The limiting reinforcement device for a stepladder according to claim 1, characterized in that: One end of the U-shaped frame (201) close to the limiting mechanism (3) is threaded with a fixing screw rod (202), and one end of the fixing screw rod (202) penetrates into the interior of the U-shaped frame (201) and is capable of abutting against a side surface of the footrest crossbar (4).

3. The position limiting and reinforcing device for a stepladder according to claim 1, characterized in that: The limiting mechanism (3) comprises two connecting inner rods (301) hinged together at one end, and the other end of the connecting inner rod (301) is slidably arranged in a connecting tube (302), and the other end of the connecting tube (302) is hinged to the U-shaped frame (201), and the connecting inner rod (301) is provided with a plurality of positioning holes (303) along the length direction, and the connecting tube (302) is threadedly provided with a second positioning screw (304) matching the positioning holes (303), and one end of the second positioning screw (304) penetrates into the interior of the connecting tube (302) and can be inserted into the positioning hole (303).

4. The position limiting and reinforcing device for a stepladder according to claim 2, characterized in that: A top plate (203) is rotatably provided at one end of the fixing screw rod 1 (202) located inside the U-shaped frame (201), and the top plate (203) can abut against a side surface of the footrest crossbar (4).

5. The position limiting and reinforcing device for a stepladder according to claim 4, characterized in that: There are two fixing screw rods (202) which are symmetrically arranged on both sides of the U-shaped frame (201).

6. The position limiting and reinforcing device for a stepladder according to claim 1, characterized in that: A bottom plate (205) is rotatably provided at one end of the opening side of the U-shaped frame (201), and the other end of the bottom plate (205) is fixedly connected to the other end of the opening side of the U-shaped frame (201) via bolts.

7. The position limiting and reinforcing device for a stepladder according to claim 3, characterized in that: A through slot is formed at one end of the connecting tube (302) close to the U-shaped frame (201); an ear plate (204) is provided on an outer side surface of the U-shaped frame (201) close to the limiting mechanism (3); the ear plate (204) is located in the through slot and is hinged thereto.

8. The position limiting and reinforcing device for a stepladder according to claim 3, characterized in that: The connecting tube (302) and the connecting inner rod (301) both have rectangular cross-sections.

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