Ladder with four legs adjustable in height

Abstract

The utility model discloses a ladder with four feet adjustable in height, which comprises two ladder legs and a plurality of pedals mounted between the two ladder legs, and each ladder leg consists of a ladder leg square sleeve and an adjusting square tube; a plurality of limiting teeth which are longitudinally arranged are arranged on one side of the adjusting square pipe, and the adjusting square pipe is slidably arranged in the bottom end of the ladder leg square sleeve in a sleeving manner; the pedals are mounted on the ladder leg square sleeves, and the two sides of the ends of the pedals are connected with the side faces of the ladder leg square sleeves through connecting plates; hand-pressing switches are arranged at the bottoms of the two ends of the lowermost pedal, and the hand-pressing switches are rotationally connected with connecting plates at the ends of the pedals through hinge shafts; and the hand pressing switch is connected with the pedal through a spring. The utility model has the advantages of stable structure, convenience in use and one-key extension; the height of each ladder leg can be adjusted, so that the ladder legs can be adjusted according to the ground to adapt to the uneven ground.

Description

Technical Field

[0001] The utility model relates to the technical field of bag clamps, in particular to a ladder with four adjustable legs. Background Art

[0002] As people's safety awareness increases, the ladders on the market now have defects. If the ladder is not placed on an uneven ground, the four legs will be unstable, and people standing on the ladder can easily fall sideways, leading to accidents.

[0003] When using a traditional ladder, you must first choose a flat ground. If the ground is uneven, you must find a way to level the ladder feet or change the location, away from the place that needs maintenance. This greatly affects the effect of using the ladder. Utility Model Content

[0004] In view of the above-mentioned technical deficiencies, the purpose of the utility model is to provide a ladder with four adjustable legs, which has a stable structure, is easy to use, and can be extended and retracted with one button.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] The utility model provides a ladder with four legs and adjustable height, comprising two ladder legs and a plurality of stepping pedals installed between the two ladder legs, wherein the ladder legs are composed of ladder leg square sleeves and adjustable square tubes;

[0007] A plurality of longitudinally arranged limiting teeth are provided on one side of the adjusting square tube, and the adjusting square tube can be slidably sleeved in the bottom end of the ladder leg square sleeve;

[0008] The pedal board is installed on the square sleeve of the ladder leg, and the two ends of the pedal board are connected to the side of the square sleeve of the ladder leg through a connecting plate; a hand switch is arranged at the bottom of both ends of the lowest pedal board, and the hand switch is rotatably connected to the connecting plate at the end of the pedal board through a hinge shaft; the hand switch and the pedal board are connected by a spring;

[0009] The hand switch is provided with a hand-pressing part and a fixing part, and the fixing part is provided with teeth corresponding to the upper limit teeth of the adjusting square tube;

[0010] Two fixed square grooves are arranged near the top of one side of the adjusting square tube, and the top of the plug is inserted into the top of the adjusting square tube and matches the internal shape of the adjusting square tube; the side of the plug is provided with a protrusion corresponding to the fixed square groove and is inserted into the fixed square groove;

[0011] Furthermore, a rubber base is installed at the bottom of the adjusting square tube.

[0012] Furthermore, the ladder is a herringbone ladder, which is composed of a left ladder and a right ladder that can be opened and closed.

[0013] Joint plates are fixed on both sides of the upper end of the left ladder, and joint plates are also fixed on both sides of the upper end of the right ladder, and are hinged one by one with the two joint plates on the upper end of the left ladder through double rivets; locking grooves are provided on the joint plates located on the outside on both sides, and the two ends of the operating rod are clamped in the locking grooves on both sides; the double rivets and the operating rod are connected by a tension spring.

[0014] Furthermore, the locking groove is heart-shaped.

[0015] The beneficial effects of the utility model are as follows: the utility model has a stable structure, is easy to use, and can be extended and retracted with one key; each ladder leg can be adjusted in height, and can be adjusted according to the ground to adapt to use on uneven ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described 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 paying creative work.

[0017] Figure 1 A schematic diagram of the structure of a ladder with four adjustable legs provided in Example 1 of the utility model;

[0018] Figure 2 A schematic structural diagram of a ladder leg with four adjustable legs provided in Example 1 of the utility model;

[0019] Figure 3 A schematic diagram of the structure of a four-legged adjustable height ladder adjusting square tube provided in Example 1 of the utility model;

[0020] Figure 4 A schematic diagram of the structure of a four-legged ladder with adjustable height and a hand-pressed switch provided in Example 1 of the utility model;

[0021] Figure 5 A schematic diagram of the structure of a ladder with four adjustable legs blocked by the utility model embodiment 1;

[0022] Figure 6 A schematic diagram of a four-legged adjustable height ladder left ladder and right ladder top connection structure provided in Example 2 of the utility model;

[0023] Figure 7 A schematic structural diagram of a ladder lock slot with four adjustable legs provided in Example 2 of the utility model.

[0024] Explanation of the accompanying reference numerals: 1. right ladder; 2. left ladder; 3. square sleeve of ladder leg; 4. stepping pedal; 5. fixed square groove; 6. adjusting square tube; 7. limit tooth; 8. rubber base; 9. connecting plate; 10. hinge shaft; 11. hand-pressed part; 12. spring; 13. hand-pressed switch; 14. fixing part; 15. plug; 16. joint plate; 17. locking groove; 18. double rivet; 19. tension spring; 20. operating lever. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example 1

[0026] like Figure 1-Figure 5 As shown, a four-legged ladder with adjustable height comprises two ladder legs and a plurality of stepping plates 4 installed between the two ladder legs, wherein the ladder legs are composed of ladder leg square sleeves 3 and adjustable square tubes 6;

[0027] A plurality of longitudinally arranged limiting teeth 7 are provided on one side of the adjusting square tube 6, and the adjusting square tube 6 can be slidably sleeved in the bottom end of the ladder leg square sleeve 3;

[0028] The pedal board 4 is mounted on the ladder leg square sleeve 3, and the ends of the pedal board 4 are connected to the side of the ladder leg square sleeve 3 through the connecting plate 9; the bottom of the two ends of the lowest pedal board 4 is provided with a hand switch 13, and the hand switch 13 is rotatably connected to the connecting plate 9 at the end of the pedal board 4 through the hinge shaft 10; the hand switch 13 and the pedal board 4 are connected by a spring 12;

[0029] The hand switch 13 is provided with a hand-pressing portion 11 and a fixing portion 14, and the fixing portion 14 is provided with teeth corresponding to the upper limit teeth 7 of the adjusting square tube 6;

[0030] Two fixed square grooves 5 are arranged near the top of one side of the adjusting square tube 6, and the top of the plug 15 is inserted into the top of the adjusting square tube 6 and matches the internal shape of the adjusting square tube 6; the side of the plug 15 is provided with a protrusion corresponding to the fixed square groove 5 and is inserted into the fixed square groove 5;

[0031] A rubber base 8 is installed at the bottom of the adjusting square tube 6 .

[0032] Working principle:

[0033] When the ladder frame is not on the uneven ground, find the suspended ladder foot and press the hand, press the hand-pressing part 11 of the hand-pressing switch 13, so that the teeth on the fixing part 14 and the limiting teeth 7 on the adjusting square tube 6 are separated, and the adjusting square tube 6 is not restricted and can slide;

[0034] The adjusting square tube 6 will automatically extend to touch the ground; the adjusting square tube 6 will slide out from the ladder leg square sleeve 3, and the height of the ladder leg can be adjusted by changing the length of the adjusting square tube 6 extending out of the ladder leg square sleeve 3 to adapt to the uneven ground.

[0035] After adjusting the height, release the hand switch 13, and the hand switch 13 is restored under the action of the spring 12, and the elastic force of the spring 12 pushes it to closely contact with the limit tooth 7 and lock it. Example

[0036] like Figure 6-7 As shown, the difference between this embodiment and embodiment 1 is that the ladder is a herringbone ladder, which is composed of a left ladder 2 and a right ladder 1 that can be opened and closed.

[0037] Joint pieces 16 are fixed on both sides of the upper end of the left ladder 2, and joint pieces 16 are also fixed on both sides of the upper end of the right ladder 1, and are hinged to the two joint pieces 16 on the upper end of the left ladder 2 by double rivets 18 one by one; locking grooves 17 are provided on the joint pieces 16 located outside on both sides, and the two ends of the operating rod 20 are clamped in the locking grooves 17 on both sides; the double rivets 18 and the operating rod 20 are connected by tension springs 19. The locking groove 17 is heart-shaped.

[0038] Working principle:

[0039] The ladder of this embodiment has two modes: a herringbone ladder and a straight ladder. The left ladder 2 and the right ladder 1 are put together for easy storage when not in use. When using the herringbone ladder, the left ladder 2 and the right ladder 1 are opened, and the left ladder 2 and the right ladder 1 rotate through the joint pieces 16 on both sides, driving the tension spring 19, and then the tension spring 19 drives the stainless steel operating rod 20, and then the stainless steel operating rod 20 is brought into the locking groove 17 of the joint piece 16, and the operating rod 20 is stuck by the tip in the middle of the locking groove 17, and the operating rod 20 limits the joint piece 16, thereby forming an effective lock.

[0040] When using a straight ladder, the two ends of the operating rod 20 are bent to one side of the locking groove 17. At this time, the joint piece 16 is not blocked by the operating rod 20, and a ladder can be flipped upwards until a straight ladder is formed.

[0041] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A four-legged ladder with adjustable height, comprising two ladder legs and a plurality of stepping plates installed between the two ladder legs, characterized in that: The ladder legs are composed of ladder leg square sleeves and adjustable square tubes; A plurality of longitudinally arranged limiting teeth are provided on one side of the adjusting square tube, and the adjusting square tube can be slidably sleeved in the bottom end of the ladder leg square sleeve; The pedal board is installed on the square sleeve of the ladder leg, and the two ends of the pedal board are connected to the side of the square sleeve of the ladder leg through a connecting plate; a hand switch is arranged at the bottom of both ends of the lowest pedal board, and the hand switch is rotatably connected to the connecting plate at the end of the pedal board through a hinge shaft; the hand switch and the pedal board are connected by a spring; The hand switch is provided with a hand-pressing part and a fixing part, and the fixing part is provided with teeth corresponding to the upper limit teeth of the adjusting square tube; Two fixed square grooves are arranged near the top of one side of the adjustable square tube, and the top of the plug is inserted into the top of the adjustable square tube and matches the internal shape of the adjustable square tube; the side of the plug is provided with a protrusion corresponding to the fixed square groove and is inserted into the fixed square groove.

2. A four-legged height-adjustable ladder according to claim 1, characterized in that: A rubber base is installed at the bottom of the adjusting square tube.

3. A four-legged height-adjustable ladder according to claim 1 or 2, characterized in that: The ladder is a herringbone ladder, which is composed of a left ladder and a right ladder that can be opened and closed. Joint plates are fixed on both sides of the upper end of the left ladder, and joint plates are also fixed on both sides of the upper end of the right ladder, and are hinged one by one with the two joint plates on the upper end of the left ladder through double rivets; locking grooves are provided on the joint plates located on the outside on both sides, and the two ends of the operating rod are clamped in the locking grooves on both sides; the double rivets and the operating rod are connected by a tension spring.

4. A four-legged height-adjustable ladder according to claim 3, characterized in that: The locking groove is heart-shaped.

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