Self-locking positioning structure for herringbone ladders

Abstract

The present invention and a self-locking positioning structure for a stepladder include a front ladder frame, a pedal, a rear ladder frame and a swing rod structure, wherein the front ladder frame includes two front ladder rods and the rear ladder frame includes two rear ladder rods; the feature is that it also includes a positioning rod and a self-locking positioning structure, wherein the positioning rod is arranged on the two rear ladder rods and is located below the pedal; the self-locking positioning structure includes a mounting frame, a reset spring, a push rod and a mounting seat; the mounting frame is mounted at the bottom of the pedal, the push rod passes through the mounting frame, one end of the push rod is provided with a push-pressing portion, and the other end of the push rod is provided with a limit block; the mounting seat is mounted at the bottom of the mounting frame, a limit groove is provided at the bottom of the mounting seat, and a limit plate is also provided on the push rod; a hook is provided at the bottom of the limit plate, and a guide inclined surface is provided at the bottom of the hook; the reset spring is provided on the push rod. The advantage is that after the stepladder is opened, the stepladder can be quickly and completely positioned, the positioned stepladder is stable, and the stepladder will not shake during the moving process, which is safe and reliable.

Description

Technical Field

[0001] The invention relates to a self-locking positioning structure for a stepladder. Background Art

[0002] The existing herringbone ladder includes a front ladder frame, a rear ladder frame, a pedal and a supporting rod, wherein the front ladder frame includes two front ladder rods, and the rear ladder frame includes two rear ladder rods; the two rear ladder rods are rotatably mounted on their respective corresponding front ladder rods, and the two sides of one end of the pedal are rotatably mounted on the two front ladder rods, and the supporting rod is arranged on the rear ladder rod. When the ladder is fully opened, the pedal is supported on the supporting rod to stop swinging downward; when the ladder is fully opened, since the ladder is not fully positioned, the front ladder frame, the rear ladder frame and the pedal of the ladder will all shake to a certain extent due to the movement of the ladder, which is unsafe to use. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a self-locking positioning structure for a stepladder. After the stepladder is opened, the stepladder can be quickly and completely positioned. The positioned stepladder is stable and will not shake during the moving process, which is safe and reliable.

[0004] In order to achieve the above-mentioned purpose, the present invention is implemented in this way. In fact, it is a self-locking positioning structure for a stepladder, including a front ladder frame, a pedal, a rear ladder frame and a swing rod structure. The front ladder frame includes two front ladder rods, and the rear ladder frame includes two rear ladder rods; the two rear ladder rods are respectively rotatably installed on the corresponding front ladder rods, one end of the swing rod structure is respectively rotatably installed on the corresponding rear ladder rod, and the other end of the swing rod structure is respectively rotatably installed on the pedal, and the two sides of one end of the pedal are respectively rotatably installed on the two front ladder rods; it is characterized in that it also includes

[0005] A positioning rod, which is arranged on the two rear ladder rods and is located below the step;

[0006] One or more self-locking positioning structures; the self-locking positioning structure comprises a mounting frame, a return spring, a push rod and a mounting seat; the mounting frame is mounted on the bottom of the pedal, the push rod passes through the mounting frame and can move laterally, the two ends of the push rod are respectively located on the outside of the mounting frame, one end of the push rod extends outward to form a pushing portion, and the other end of the push rod is provided with a limit block; the mounting seat is mounted on the bottom of the mounting frame, a limit groove is provided at the bottom of the mounting seat, and a limit plate extending downward is also provided on the push rod, the limit plate passes through the limit groove and cooperates with the limit groove, and the limit block and the limit plate cooperate to limit the lateral movement distance of the push rod; a hook is provided at the bottom of the limit plate to cooperate with the positioning rod, and a guide inclined surface is provided at the bottom of the hook, and the guide inclined surface is inclined upward; the return spring is arranged on the push rod, one end of the return spring abuts on the mounting frame, and the other end of the return spring abuts on the limit plate.

[0007] In the technical solution, two longitudinal plates are further provided on the mounting seat, and the two longitudinal plates are respectively located on both sides of the limiting groove to prevent the push rod from swinging.

[0008] In the technical solution, a protective cap is provided on the pushing portion of the push rod.

[0009] In this technical solution, the pushing portion is located outside the pedal.

[0010] In the technical solution, limiting holes are further provided on both sides of the bottom of the pedal, and the positioning rod can be located in the limiting holes.

[0011] Compared with the prior art, the advantages of the present invention are as follows: after the ladder is opened, the ladder can be quickly and completely positioned; the positioned ladder is stable; the ladder does not shake during the moving process, and is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a stereogram of the present invention;

[0013] Figure 2 It is the right view of the figure;

[0014] Figure 3 yes Figure 2 AA section view;

[0015] Figure 4 yes Figure 3 A magnified view of the local area A;

[0016] Figure 5 It is a three-dimensional diagram of the self-locking positioning structure of the present invention;

[0017] Figure 6 It is a three-dimensional diagram of another orientation of the self-locking positioning structure of the present invention. DETAILED DESCRIPTION

[0018] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0019] In the description of the present invention, the orientations or positional relationships indicated by terms such as "bottom", "below", "one end", "the other end", "one direction" and "another direction" are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0020] In the present invention, unless otherwise clearly specified and limited, the terms "install", "pass through" and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, a detachable set, or an integrated one; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, which can make the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] like Figures 1 to 6 As shown, it is a self-locking positioning structure for a stepladder, comprising a front ladder frame, a pedal 2, a rear ladder frame and a swing rod structure 6, wherein the front ladder frame comprises two front ladder rods 1, and the rear ladder frame comprises two rear ladder rods 3; the two rear ladder rods 3 are rotatably mounted on the respective corresponding front ladder rods 1, one end of the swing rod structure 6 is rotatably mounted on the respective corresponding rear ladder rod 3, and the other end of the swing rod structure 6 is rotatably mounted on the pedal 2, and both sides of one end of the pedal 2 are rotatably mounted on the two front ladder rods 1; it also comprises

[0022] A positioning rod, wherein the positioning rod 4 is arranged on the two rear ladder rods 3 and is located below the pedal 2;

[0023] A self-locking positioning structure 5; the self-locking positioning structure 5 includes a mounting frame 51, a return spring 52, a push rod 53 and a mounting seat 54; the mounting frame 51 is installed at the bottom of the pedal 2, the push rod 53 passes through the mounting frame 51 and can move laterally, the two ends of the push rod 53 are respectively located on the outside of the mounting frame 51, one end of the push rod 53 extends outward to form a push-pressing portion, and the other end of the push rod 53 is provided with a limit block 531; the mounting seat 54 is installed at the bottom of the mounting frame 51, and a limit groove 541 is provided at the bottom of the mounting seat 54, and a limit groove 541 is provided on the push rod 53. The limit plate 532 extends downward, the limit plate 532 passes through the limit slot 541 and cooperates with the limit slot 541, the limit block 531 and the limit plate 532 cooperate to limit the lateral movement distance of the push rod 53; a hook 533 is provided at the bottom of the limit plate 532 to cooperate with the positioning rod 4, and a guide slope 534 is provided at the bottom of the hook 533, and the guide slope 534 is inclined upward; the reset spring 52 is provided on the push rod 53, one end of the reset spring 52 abuts on the mounting frame 51, and the other end of the reset spring 52 abuts on the limit plate 532. The self-locking positioning structure 5 can also be one, two or three, etc., depending on the actual size of the ladder.

[0024] When the ladder is opened, the front ladder frame and the rear ladder frame are pulled apart, and during the downward swinging of the pedal 2, the guide slope 534 at the bottom of the hook 533 touches the positioning rod 4. As the pedal 2 continues to swing downward, the positioning rod 4 pushes the push rod 53 to move in another direction through the guide slope 534, and the pedal 2 completely rests on the positioning rod 4. The positioning rod 4 and the guide slope 534 are out of cooperation. The push rod 53 moves in one direction under the action of the return spring 52, and the hook 533 and the positioning rod 4 are hooked and engaged to completely position the front ladder frame, the pedal 2 and the rear ladder frame. The positioned ladder is stable, and the ladder will not shake during the moving process, which is safe and reliable.

[0025] When the stepladder is folded, the push portion is pressed, the push rod 53 moves in one direction, the hook 533 and the positioning rod 4 are separated from the hook-and-hook matching relationship, and the stepladder is folded.

[0026] In this embodiment, two longitudinal plates 542 are further provided on the mounting seat 54 . The two longitudinal plates 542 are respectively located on both sides of the limiting groove 541 to prevent the push rod 53 from swinging.

[0027] In this embodiment, a protection cap 55 is provided on the pushing portion of the push rod 53 .

[0028] In this embodiment, the pushing portion is located on the outer side of the pedal 2 .

[0029] In this embodiment, limiting holes 21 are further provided on both sides of the bottom of the pedal 2, and the positioning rods 4 can be located in the limiting holes 21, further positioning the front ladder frame, the pedal 2 and the rear ladder frame.

[0030] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and deformations of these embodiments without departing from the principles and purposes of the present invention still fall within the scope of protection of the present invention.

Claims

1. A self-locking positioning structure for a stepladder, comprising a front ladder frame, a pedal (2), a rear ladder frame and a swing rod structure (6), wherein the front ladder frame comprises two front ladder rods (1), and the rear ladder frame comprises two rear ladder rods (3); the two rear ladder rods (3) are respectively rotatably mounted on the respective corresponding front ladder rods (1), one end of the swing rod structure (6) is respectively rotatably mounted on the respective corresponding rear ladder rods (3), the other end of the swing rod structure (6) is respectively rotatably mounted on the pedal (2), and both sides of one end of the pedal (2) are respectively rotatably mounted on the two front ladder rods (1); characterized in that Also includes A positioning rod, wherein the positioning rod (4) is arranged on the two rear ladder rods (3) and is located below the pedal (2); One or more self-locking positioning structures (5); the self-locking positioning structure (5) comprises a mounting frame (51), a return spring (52), a push rod (53) and a mounting seat (54); the mounting frame (51) is mounted on the bottom of the pedal (2); the push rod (53) passes through the mounting frame (51) and can move laterally; two ends of the push rod (53) are respectively located on the outside of the mounting frame (51); one end of the push rod (53) extends outward to form a push-pressing portion; the other end of the push rod (53) is provided with a limit block (531); the mounting seat (54) is mounted on the bottom of the mounting frame (51); a limit groove (541) is provided at the bottom of the mounting frame (54); a limit plate (532) extending downward is also provided on the push rod (53); the limit plate (532) passes through the limit groove (541) and is aligned with the limit groove (541). 41), the limit block (531) and the limit plate (532) cooperate to limit the lateral movement distance of the push rod (53); a hook (533) cooperating with the positioning rod (4) is provided at the bottom of the limit plate (532), and a guide slope (534) is provided at the bottom of the hook (533), and the guide slope (534) is inclined upward; the return spring (52) is provided on the push rod (53), one end of the return spring (52) abuts on the mounting frame (51), and the other end of the return spring (52) abuts on the limit plate (532); two longitudinal plates (542) are also provided on the mounting seat (54), and the two longitudinal plates (542) are respectively located on both sides of the limit slot (541) to prevent the push rod (53) from swinging; a protective cap (55) is provided on the pushing portion of the push rod (53).

2. The self-locking positioning structure for a stepladder according to claim 1 is characterized in that The pushing portion is located outside the pedal (2).

3. The self-locking positioning structure for a stepladder according to claim 1 is characterized in that Limiting holes (21) are also provided on both sides of the bottom of the pedal (2), and the positioning rod (4) can be located in the limiting holes (21).

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