A chevron ladder stabilizing structure

Abstract

The utility model belongs to ladder technical field especially relates to a kind of herringbone ladder stable structure.A kind of herringbone ladder stable structure, comprising: first limit rod, it is used to be hinged connection with one branch leg of herringbone ladder;Second limit rod, it is used to be hinged connection with another branch leg of herringbone ladder;Lock seat, it is located between the first limit rod and second limit rod, one end of the first limit rod is fixedly connected with the lock seat, one end of the second limit rod is rotatably connected with the lock seat;The second limit rod is equipped with lock hole, lock seat is equipped with the locking piece that can be moved and inserts into the lock hole;When first limit rod and second limit rod are in unfolded state, the locking piece inserts into the lock hole to maintain the unfolded state of first limit rod and second limit rod.The utility model has the advantages of being convenient for user to use, preventing ladder from being accidentally folded at the same time, thereby ensuring the safety of user.

Description

Technical Field

[0001] This utility model belongs to the field of ladder technology, and in particular relates to a stable structure for an A-frame ladder. Background Technology

[0002] A-frame ladders, a common tool for working at heights, use two hinged legs to form an "A" shape to support the operator. To prevent changes in the angle between the legs due to the operator's weight or other vertical loads, a stabilizing structure is usually installed between the two legs. This stabilizing structure typically includes two limiting rods hinged to the two legs, with their middle sections hinged together to form a retractable X-shaped structure. This limits the unfolding angle of the A-frame ladder and ensures its stability.

[0003] Existing technologies have made various improvements to the aforementioned stabilizing structure. For example, Chinese Patent Application No. 202322634725.3 discloses an A-frame ladder for power equipment maintenance, which has locking holes on each limiting bar (referred to as a "connecting plate" in the patent). When the two limiting bars are extended to 180°, an independent U-shaped locking block is simultaneously inserted into the locking holes of both limiting bars to achieve forced locking of the angle, thereby enhancing stability.

[0004] However, the existing technical solution has obvious drawbacks: First, the U-shaped locking block is an independent component that needs to be stored separately when not in use, which is not only inconvenient but also easy to lose or forget, causing the locking function to fail; Second, the design increases the operation steps. Every time the A-frame ladder is unfolded and retracted, the user needs to insert and pull out the U-shaped locking block, which is cumbersome and reduces the efficiency of use. Utility Model Content

[0005] To address the shortcomings of existing technologies, a stable A-frame ladder structure is provided that is easy for users to use while preventing the ladder from accidentally collapsing, thus ensuring user safety.

[0006] This utility model is achieved using the following technical solution: a stable structure for an A-frame ladder, comprising:

[0007] The first limiting rod is used to be hinged to one of the legs of the A-frame ladder;

[0008] The second limiting rod is used to be hinged to the other leg of the A-frame ladder;

[0009] A lock seat is disposed between the first limiting rod and the second limiting rod. One end of the first limiting rod is fixedly connected to the lock seat, and one end of the second limiting rod is rotatably connected to the lock seat. The second limiting rod is provided with a lock hole, and the lock seat is provided with a locking member that can be moved and inserted into the lock hole.

[0010] When the first and second limiting rods are in the unfolded state, the locking member is inserted into the lock hole to maintain the unfolded state of the first and second limiting rods.

[0011] When the user operates the ladder, the two legs are extended outwards. At this time, the first and second limiting rods, respectively fixed to the two legs, rotate and unfold relative to each other. When the first and second limiting rods rotate to a predetermined angle of full unfolding (e.g., 180°, i.e., they are in a straight line), the locking hole on the second limiting rod also rotates to a position directly opposite the locking element on the lock seat. The locking element is inserted into the locking hole, thus locking the first and second limiting rods in the unfolded state.

[0012] When the A-frame ladder needs to be folded, the user controls the movement of the locking mechanism so that the locking mechanism can be disengaged from the lock hole. At this time, the second limit rod can rotate relative to the lock seat, so that the A-frame ladder can be folded.

[0013] The locking mechanism can be moved by the user pulling or pressing it directly, or indirectly by using other existing methods, such as using a lever to pry it open.

[0014] The locking element is always mounted on the lock base and will not detach from it, so the user will not lose the locking element when the lock is not in use.

[0015] Preferably, the locking member is equipped with an elastic member, which is disposed within the lock seat and acts on the locking member, causing the locking member to have a tendency to move in the locking direction.

[0016] The above configuration allows the locking element to automatically insert into the keyhole after being aligned with it, and ensures the stability of the second limit rod during locking.

[0017] Preferably, the lock seat is also provided with an unlocking component, which is an unlocking lever. The middle part of the unlocking lever is rotatably connected to the lock seat to form a fulcrum. The locking component is fixedly connected to one end of the unlocking lever located inside the lock seat.

[0018] The elastic element acts on the other end of the unlocking lever, providing it with an elastic force that tends to move the locking element toward the keyhole.

[0019] When the end of the unlocking lever with the elastic element is pressed, the unlocking lever rotates around the fulcrum and causes the locking element to disengage from the keyhole.

[0020] The user can unlock the mechanism by pinching and pressing the unlocking component, making it easy to operate. The locking component can be secured to the unlocking lever with screws, or it can be integrally molded with the unlocking lever, etc.

[0021] Preferably, the lock seat has a rotating groove for the end of the second limiting rod to be inserted and rotated; when the second limiting rod is extended to a predetermined position, its rod body abuts against the groove wall of the rotating groove to achieve lateral limiting, at which time the locking member is aligned with the lock hole.

[0022] In this manner, the groove wall of the rotating slot acts as a mechanical positioning and stopping mechanism, providing a precise endpoint for the rotational movement of the second limit rod. This ensures that the second limit rod reaches a unique and correct predetermined position each time the A-frame ladder is unfolded. In this position, the locking hole on the second limit rod and the locking element on the lock seat are automatically and precisely aligned. This allows the user to confirm that the second limit rod is locked in place.

[0023] Preferably, the lock seat has a fixing groove for fixing the end of the first limiting rod, and the fixing groove and the rotating groove are arranged side by side in the thickness direction of the lock seat.

[0024] The above settings can prevent the second limit rod from hitting the first limit rod after folding, thus avoiding interference.

[0025] Preferably, the fixing groove and the rotating groove are connected in the thickness direction of the lock seat, so that the fixing end of the first limiting rod and the rotating end of the second limiting rod can be housed side by side in the same groove area; the ends of the first limiting rod, the ends of the second limiting rod, and the corresponding side walls of the lock seat are provided with coaxial shaft holes, and are connected through a common rotating shaft; the second limiting rod can rotate around the rotating shaft.

[0026] The above settings allow for a more compact lock base structure and a thinner lock base.

[0027] Preferably, the first limiting rod and the corresponding side wall of the lock seat are provided with coaxial mounting holes, and the elastic element is assembled in the mounting holes.

[0028] The above settings allow for a more compact lock base structure and a thinner lock base.

[0029] Preferably, the end of the second limiting rod has a rotating part that extends laterally, the rotating part being L-shaped with the second limiting rod, and the rotating part having the shaft hole.

[0030] Preferably, the end of the locking member has a guide slope on the side facing the second limiting rod.

[0031] By setting a guide ramp, the second limiting rod can be made to press against the guide ramp of the locking member when it is unfolded, causing the locking member to retract. Then, when the locking member is aligned with the locking member, the locking member will automatically pop out.

[0032] Compared with the prior art, the beneficial effects of this utility model are: the stable structure of the A-frame ladder makes it easy for users to operate. Users only need to press the unlocking part to unlock it, and the locking part can also automatically insert into the lock hole when unfolded, which is very convenient; it is easy for users to use, and at the same time prevents the ladder from being accidentally folded, thereby ensuring user safety. Attached Figure Description

[0033] Figure 1 A structural diagram illustrating the deployment and locking mechanism to ensure structural stability;

[0034] Figure 2 Another diagram showing the view structure during the deployment and locking process is provided to stabilize the structure.

[0035] Figure 3 This is a schematic diagram of the structure after the lock seat has been removed;

[0036] Figure 4 This is a sectional view of the lock base;

[0037] Figure 5 This is a sectional view of another section line of the lock base;

[0038] Figure 6 A structural diagram illustrating the structure during folding to ensure stability;

[0039] Figure 7 This is a schematic diagram of the lock seat after the first and second limit rods have been removed.

[0040] Reference numerals: 1. Lock seat; 11. Unlocking component; 111. Pivot point; 21. First limit rod; 22. Second limit rod; 221. Lock hole; 222. Rotating part; 31. Shaft hole; 32. Fixing hole; 4. Elastic component; 5. Locking component; 51. Guide slope; 61. Rotating groove; 62. Fixing groove; 7. Mounting hole. Detailed Implementation

[0041] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0042] like Figures 1 to 7As shown, this embodiment discloses a stabilizing structure for an A-frame ladder, including a first limiting rod 21 and a second limiting rod 22. The first limiting rod 21 is hinged to one leg of the A-frame ladder, and the second limiting rod 22 is hinged to the other leg of the A-frame ladder (not shown in the figure). The A-frame ladder can be any existing ladder that is A-shaped and can be opened or closed. A locking seat 1 is provided between the first limiting rod 21 and the second limiting rod 22. One end of the first limiting rod 21 is fixedly connected to the locking seat 1, and one end of the second limiting rod 22 is rotatably connected to the locking seat 1. This ensures that when the A-frame ladder is opened, the first limiting rod 21 and the second limiting rod 22 are flattened at a 180° angle; when the A-frame ladder is closed, the first limiting rod 21 and the second limiting rod 22 also close accordingly.

[0043] The thickness of the lock seat 1 is much greater than the thickness of the first limiting rod 21 and the second limiting rod 22. The lock seat 1 is provided with a fixing groove 62 for fixing the end of the first limiting rod 21 and a rotating groove 61 for rotatably connecting the second limiting rod 22. The fixing groove 62 and the rotating groove 61 are connected in the thickness direction of the lock seat 1, so that the fixed end of the first limiting rod 21 and the rotating end of the second limiting rod 22 can be placed side by side in the same groove area. The ends of the first limiting rod 21, the ends of the second limiting rod 22, and the corresponding side walls of the lock seat 1 are provided with coaxial shaft holes 31, which are connected through a common rotating shaft (not shown in the figure), so that the second limiting rod 22 can rotate around the rotating shaft. Meanwhile, a fixing hole 32 is provided on the corresponding side wall of the lock seat 1 and the first limiting rod 21. The fixing component (not shown in the figure, but may be a screw, pin or other component) is inserted into the fixing hole 32, so that the first limiting rod 21 is fixed by the fixing component and the rotating shaft, thereby realizing that the first limiting rod 21 cannot rotate and is fixed to the lock seat 1.

[0044] The lock base 1 is also provided with an unlocking component 11, which is an unlocking lever. The middle part of the unlocking lever is rotatably connected to the lock base 1 to form a fulcrum 111. One end of the unlocking component 11 is fixed with a locking component 5, which is fixedly connected to the end of the unlocking lever located inside the lock base 1. The fixing method can be by screws or pins, or it can be integrally formed. The other end of the unlocking component 11 is connected with an elastic component 4, which is a conventional spring. The first limiting rod 21 and the corresponding side wall of the lock base 1 are provided with coaxial mounting holes 7, and the elastic component 4 is assembled in the mounting holes 7.

[0045] The locking element 5 can be inserted into the rotating groove 61 and the fixed groove 62. The first limiting rod 21 has a clearance hole for the locking element 5 to pass through, and the second limiting rod 22 has a locking hole 221 for the locking element to be inserted. The locking element 5 is located on the rotation path of the locking hole 221 of the second limiting rod 22. The elastic element 4 acts on the other end of the unlocking lever, providing it with an elastic force that tends to make the locking element 5 move towards the locking hole 221. When the second limiting rod 22 is extended to the predetermined position, its rod body abuts against the groove wall of the rotating groove 61 to achieve lateral limiting, at which time the locking element 5 is exactly aligned with the locking hole 221.

[0046] The locking member 5 has a guide slope 51 on the side facing the second limiting rod 22. When the second limiting rod 22 is flattened at 180° with the first limiting rod 21, the locking member 5 is inserted into the lock hole 221 to maintain the unfolded state of the first limiting rod 21 and the second limiting rod 22.

[0047] When the end of the unlocking lever equipped with the elastic element 4 is pressed, the unlocking lever rotates around the fulcrum 111, causing the locking element 5 to disengage from the lock hole 221. This releases the locking state of the first limiting rod 21 and the second limiting rod 22.

[0048] The end of the second limiting rod 22 extends laterally with a rotating part 222, which is L-shaped with the second limiting rod 22. The rotating part 222 has the aforementioned shaft hole 31. This arrangement prevents the second limiting rod 22 from rotating to coincide with the first limiting rod 21 in the thickness direction of the lock seat 1 when it is folded, allowing the lock seat 1 to be machined with fixing holes 32 and mounting holes 7 in the area of ​​the first limiting rod 21.

[0049] When in use, the user extends the two legs of the A-frame ladder outwards. At this time, the first limiting rod 21 and the second limiting rod 22, respectively fixed to the two legs, rotate and unfold relative to each other. The user can lift the locking seat 1 upwards, causing the first limiting rod 21 and the second limiting rod 22 to rotate to a predetermined angle of full unfolding (e.g., 180°, i.e., they are in a straight line). At this point, the locking hole 221 on the second limiting rod 22 also rotates to a position directly opposite the locking member 5 on the locking seat 1. The locking member 5, under elastic action, automatically and quickly inserts into the locking hole 221, thus locking the first limiting rod 21 and the second limiting rod 22 in the unfolded state.

[0050] When the A-frame ladder needs to be folded, the user only needs to press the unlocking part 11 to control the movement of the locking part 5, so that the locking part 5 can be disengaged from the lock hole 221. Then, apply a downward pressing force to the lock seat 1, so that the lock hole 221 of the second limiting rod 22 completely leaves the locking part 5. At this time, the second limiting rod 22 can rotate relative to the lock seat 1, so that the A-frame ladder can be folded.

Claims

1. A stable structure for an A-frame ladder, characterized in that, include: The first limiting rod is used to be hinged to one of the legs of the A-frame ladder; The second limiting rod is used to be hinged to the other leg of the A-frame ladder; A lock seat is disposed between the first limiting rod and the second limiting rod. One end of the first limiting rod is fixedly connected to the lock seat, and one end of the second limiting rod is rotatably connected to the lock seat. The second limiting rod is provided with a lock hole, and the lock seat is provided with a locking member that can be moved and inserted into the lock hole. When the first and second limiting rods are in the unfolded state, the locking member is inserted into the lock hole to maintain the unfolded state of the first and second limiting rods.

2. The stabilizing structure of the A-frame ladder according to claim 1, characterized in that: The locking element is equipped with an elastic element, which is located inside the lock seat and acts on the locking element, causing the locking element to tend to move in the locking direction.

3. The stabilizing structure of the A-frame ladder according to claim 2, characterized in that: The lock base is also provided with an unlocking component, which is an unlocking lever. The middle part of the unlocking lever is rotatably connected to the lock base to form a fulcrum. The locking component is fixedly connected to one end of the unlocking lever located inside the lock base. The elastic element acts on the other end of the unlocking lever, providing it with an elastic force that tends to move the locking element toward the keyhole. When the end of the unlocking lever with the elastic element is pressed, the unlocking lever rotates around the fulcrum and causes the locking element to disengage from the keyhole.

4. The stabilizing structure of the A-frame ladder according to claim 3, characterized in that: The lock seat has a rotating groove for the end of the second limiting rod to be inserted and rotated; when the second limiting rod is extended to the predetermined position, its rod body abuts against the groove wall of the rotating groove to achieve lateral limiting, at which time the locking member is aligned with the lock hole.

5. The stabilizing structure of the A-frame ladder according to claim 4, characterized in that: The lock seat has a fixing groove for fixing the end of the first limiting rod, and the fixing groove and the rotating groove are arranged side by side in the thickness direction of the lock seat.

6. The stabilizing structure of the A-frame ladder according to claim 5, characterized in that: The fixed groove and the rotating groove are connected in the thickness direction of the lock seat, so that the fixed end of the first limiting rod and the rotating end of the second limiting rod can be placed side by side in the same groove area; the ends of the first limiting rod, the ends of the second limiting rod, and the corresponding side walls of the lock seat are provided with coaxial shaft holes, and are connected by a common rotating shaft; the second limiting rod can rotate around the rotating shaft.

7. The stabilizing structure of the A-frame ladder according to claim 5, characterized in that: The first limiting rod and the corresponding side wall of the lock seat are provided with coaxial mounting holes, and the elastic element is assembled in the mounting holes.

8. The stabilizing structure of the A-frame ladder according to claim 6, characterized in that: The end of the second limiting rod has a rotating part that extends laterally. The rotating part is L-shaped with the second limiting rod, and the rotating part has the shaft hole.

9. The stabilizing structure for an A-frame ladder according to any one of claims 1 to 8, characterized in that: The end of the locking member has a guide slope on the side facing the second limiting rod.

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