A telescoping lockable front support leg assembly for a tripod ladder

Abstract

This invention discloses an anti-tipping telescopic locking front support leg assembly for a tripod, comprising a front support leg and an anti-tipping telescopic locking mechanism hinged to the front support leg. The anti-tipping telescopic locking mechanism consists of an upper fixed sleeve, a clamping sleeve, a telescopic auxiliary leg, and a turnbuckle assembly: two upper fixed sleeves are symmetrically arranged left and right; the clamping sleeve is coaxially positioned below the upper fixed sleeve; the telescopic auxiliary leg passes through the sleeve and can slide axially; the turnbuckle passes through the turnbuckle sleeve, with both ends connected to the two clamping sleeves; the upper end of the sleeve connecting rod connects to the upper fixed sleeve connecting rod, and the lower end connects to the turnbuckle sleeve, used to limit the corresponding height of the clamping sleeve and the turnbuckle; when the turnbuckle is rotated, both ends retract and expand simultaneously, driving the clamping sleeve to deflect inward, simultaneously achieving a dual locking effect of radial clamping friction locking and upper surface abutment axial limiting. The anti-tipping mechanism of this invention can be rotated around the upper hinge point to adjust the support angle, adapting to working scenarios close to tree trunks; the double locking of the two auxiliary legs can be completed with just one rotation operation, which is simple to operate, reliable in locking, and significantly improves the anti-tipping performance and terrain adaptability of the tripod.

Description

Technical Field

[0001] This invention relates to the field of tools and accessories for working at heights, and in particular to an anti-tipping telescopic locking front support leg assembly for a tripod ladder. Background Technology

[0002] Three-legged ladders are widely used for working at heights in confined spaces such as garden pruning, interior decoration, and plumbing and electrical maintenance due to their single front leg support and small footprint. However, traditional three-legged ladders rely solely on three main legs for support, making them prone to tipping over when workers lean to the side or shift their center of gravity, posing a significant safety hazard.

[0003] The existing anti-tipping improvement solutions have the following main shortcomings:

[0004] Firstly, most of them are hinged opening and closing auxiliary legs, which can only be unfolded and stored at a fixed angle. They cannot steplessly adjust the support angle or the extension length of the legs, making it difficult to adapt to uneven ground and different support span requirements.

[0005] Secondly, the locking structures are mostly single-point snap-fit ​​or set screw type, which are prone to loosening under vibration during operation, resulting in insufficient locking reliability. Specifically, single-point snap-fit ​​relies on the mechanical obstruction of a single engagement point to limit extension and contraction, while set screw type relies on a single point of radial tightening to generate friction. Both lack redundant locking mechanisms and are prone to failure due to material creep or snap-fit ​​fatigue under continuous vibration conditions.

[0006] Third, most of them are external wide-width structures. When garden pruning is done close to the tree trunk, the anti-falling structure is easily blocked by the tree trunk and cannot be close to the working surface, which limits its use.

[0007] Currently, there is no anti-tipping support structure that is integrated into the front support leg of a tripod, has an adjustable hinged support angle, and achieves simultaneous radial and axial dual locking through a single tensioning mechanism. Summary of the Invention

[0008] (a) Technical problems to be solved

[0009] In view of the above-mentioned defects or improvement needs of the existing technology, the present invention provides an anti-tipping telescopic locking front support leg assembly for a tripod, which aims to solve the technical problems of insufficient anti-tipping ability, poor adaptability to terrain and scene, and easy loosening of the locking mechanism of traditional tripods.

[0010] (II) Technical Solution

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] A tripod anti-tipping telescopic locking front support leg assembly includes a front support leg and an anti-tipping telescopic locking mechanism; the upper end of the anti-tipping telescopic locking mechanism is hinged to the front support leg by a connecting bolt, so that the entire anti-tipping telescopic locking mechanism can rotate around the hinge axis to adjust the support angle.

[0013] The anti-tipping telescopic locking mechanism includes two upper fixed sleeves, two clamping sleeves, two telescopic auxiliary legs, and a turnbuckle assembly.

[0014] The two upper fixed sleeves are symmetrically fixed on the left and right, and the two clamping sleeves are coaxially correspondingly set below the upper fixed sleeves. The telescopic auxiliary leg is coaxially inserted into the upper fixed sleeve and the clamping sleeve on the same side, and its extension length can be adjusted by sliding along the sleeve axis.

[0015] The turnbuckle assembly is horizontally connected between two clamping sleeves, and the outer wall of the clamping sleeve is hinged to the end of the turnbuckle assembly. When the turnbuckle assembly is tightened, the two clamping sleeves are deflected inward by horizontal tension, and the inner side of the sleeve wall radially compresses the telescopic auxiliary leg to form a friction lock. At the same time, the upper end face of the clamping sleeve abuts against the lower end face of the upper fixed sleeve, forming a rigid limit that restricts the axial sliding of the telescopic auxiliary leg, and simultaneously realizing the double locking of the two telescopic auxiliary legs.

[0016] Furthermore, the inner diameter of the clamping sleeve is the same as that of the upper fixed sleeve, and the outer diameter of the telescopic auxiliary leg is clearance-fitted with the inner diameter of the sleeve to ensure smooth telescopic sliding.

[0017] Furthermore, an upper fixed sleeve connecting rod is fixedly installed between the two upper fixed sleeves to improve the overall structural strength and stability of the mechanism.

[0018] Furthermore, a connecting ring is fixedly provided on the outer wall of the clamping sleeve, and the end of the turnbuckle assembly is hinged to the clamping sleeve through the connecting ring, so that the clamping sleeve can adaptively deflect during the tightening process and the clamping force is evenly distributed.

[0019] Furthermore, the turnbuckle assembly includes a turnbuckle sleeve, a sleeve connecting rod, and a turnbuckle; the turnbuckle passes through the inside of the turnbuckle sleeve, with both ends extending out of the turnbuckle sleeve and connecting to the clamping sleeves on the corresponding sides; the upper end of the sleeve connecting rod is fixedly connected to the upper fixed sleeve connecting rod, and the lower end is fixedly connected to the middle of the turnbuckle sleeve, which is used to limit the corresponding height of the clamping sleeve and the turnbuckle, ensuring stable and reliable clamping action.

[0020] Furthermore, when the turnbuckle is rotated, both ends of the turnbuckle simultaneously retract inward or extend outward, driving the two clamping sleeves to move synchronously, thereby achieving synchronous locking and unlocking of the telescopic auxiliary legs on both sides.

[0021] (III) Beneficial Effects

[0022] The present invention has the following beneficial effects and significant progress:

[0023] 1. Excellent anti-tipping performance. Extendable auxiliary legs are added to both sides of the front support leg, increasing the support span and number of support points on the front of the tripod, significantly reducing the risk of tipping over and improving operational safety.

[0024] 2. Dual stepless adjustment for strong adaptability. On the one hand, the telescopic auxiliary legs can slide freely along the axial direction of the sleeve, adjusting the extension length as needed to adapt to complex terrains such as uneven ground and slopes; on the other hand, the anti-tipping mechanism can rotate around the upper hinge point, steplessly adjusting the support angle. When working close to the tree trunk, the angle can be flexibly adjusted to avoid obstruction by the tree trunk, making it especially suitable for garden pruning scenarios.

[0025] 3. Reliable and stable dual locking. A single operation—rotating the turnbuckle—synchronously drives the clamping sleeves on both sides to deflect inward, simultaneously achieving radial clamping friction locking and axial rigid restraint of the telescopic auxiliary legs. Compared to traditional single-point snap-locking, the locking force is provided by both friction and rigid restraint, significantly improving vibration resistance and preventing loosening.

[0026] 4. High degree of structural integration and convenient storage. The entire anti-tipping mechanism is integrated into the front support leg. When storing, the auxiliary leg can be completely retracted into the sleeve. The entire mechanism can rotate to fit the front support leg. The overall size is small and highly portable.

[0027] 5. Simple and efficient operation. All adjustment and locking actions require only one operation—turning the turnbuckle to simultaneously lock and unlock both auxiliary legs, eliminating the need to operate the locking mechanisms on both sides individually, significantly improving on-site operation efficiency. Attached Figure Description

[0028] Figure 1 This is a three-dimensional schematic diagram of the overall usage state of the present invention installed on a tripod ladder;

[0029] Figure 2 This is a side perspective view of the front support leg assembly of the present invention;

[0030] Figure 3 This is another perspective view of the front support leg assembly of the present invention;

[0031] Figure 4 This is a partial enlarged front view of the anti-tipping telescopic locking mechanism of the present invention.

[0032] Explanation of markings in the diagram:

[0033] 1 - Front support leg, 2 - Anti-tipping telescopic locking mechanism, 201 - Upper fixing sleeve, 202 - Clamping sleeve, 203 - Telescopic auxiliary leg, 204 - Connecting bolt, 205 - Upper fixing sleeve connecting rod, 206 - Connecting ring, 207 - Turnbuckle sleeve, 208 - Sleeve connecting rod, 209 - Turnbuckle. Detailed Implementation

[0034] The invention will now be further described with reference to the accompanying drawings.

[0035] like Figure 1-4 As shown, the present invention discloses an anti-tipping telescopic locking front support leg assembly for a tripod ladder, comprising a front support leg (1) and an anti-tipping telescopic locking mechanism (2). The upper end of the anti-tipping telescopic locking mechanism (2) is hinged to the front support leg (1) by a connecting bolt (204), so that the entire anti-tipping telescopic locking mechanism (2) can rotate around the hinge axis to adjust the support angle between it and the front support leg (1) to adapt to the support span requirements of different working scenarios; when working close to the tree trunk, the angle can be adjusted so that the front support leg (1) is close to the tree trunk, and the anti-tipping mechanism unfolds to the side to provide support, avoiding obstruction by the tree trunk.

[0036] The anti-tipping telescopic locking mechanism (2) specifically includes two upper fixed sleeves (201), two clamping sleeves (202), two telescopic auxiliary legs (203), and turnbuckle assembly.

[0037] Two upper fixing sleeves (201) are arranged symmetrically in the vertical direction. An upper fixing sleeve connecting rod (205) is welded and fixed between the two upper fixing sleeves (201) to enhance the overall structural strength and integrity of the mechanism. Two clamping sleeves (202) are respectively arranged directly below each upper fixing sleeve (201). In the initial relaxed state, the clamping sleeves (202) and the upper fixing sleeves (201) are coaxially aligned and their inner diameters are completely identical.

[0038] Each telescopic auxiliary leg (203) is inserted into the upper fixed sleeve (201) and clamping sleeve (202) on the same side from top to bottom. The outer diameter of the telescopic auxiliary leg (203) and the inner diameter of the sleeve are in clearance fit, and can slide freely up and down along the axial direction of the sleeve, thereby adjusting the extension length of the lower end to adapt to different flatness of the ground.

[0039] The turnbuckle assembly is horizontally positioned between two clamping sleeves (202), specifically including a turnbuckle sleeve (207), a sleeve connecting rod (208), and a turnbuckle (209). The turnbuckle (209) is entirely inserted inside the turnbuckle sleeve (207), with both ends extending from the left and right sides of the turnbuckle sleeve (207), respectively. The threads at both ends of the turnbuckle (209) rotate in opposite directions, and when the turnbuckle (209) is rotated, both ends of the turnbuckle (209) simultaneously retract inward or extend outward.

[0040] The upper end of the sleeve connecting rod (208) is welded and fixed to the upper fixed sleeve connecting rod (205), and the lower end is welded and fixed to the middle part of the turnbuckle sleeve (207). This is used to limit the corresponding height of the clamping sleeve (202) and the turnbuckle (209), so that the force application point corresponds precisely to the clamping sleeve (202) and ensures stable clamping effect.

[0041] A connecting ring (206) is fixedly provided on the outer wall of the clamping sleeve (202). The outer end of the turnbuckle (209) is hinged to the clamping sleeve (202) through the connecting ring (206), so that the clamping sleeve (202) can adaptively deflect during the tightening process and the clamping force is evenly distributed.

[0042] The working principle and usage of this component are as follows:

[0043] 1. Adjust the support angle. Rotate the entire anti-tipping telescopic locking mechanism (2) around the connecting bolt (204) to adjust to a suitable support angle to match the support span requirements of the work scenario; when working close to the tree trunk, the angle can be adjusted so that the front support leg (1) is close to the tree trunk, and the anti-tipping mechanism unfolds to the side to support, avoiding obstruction by the tree trunk.

[0044] 2. Adjust the extension length of the auxiliary legs. Rotate the turnbuckle (209) in the opposite direction to extend both ends of the turnbuckle (209) outward, and loosen the turnbuckle assembly; at this time, the clamping sleeve (202) returns to a relaxed state, and the telescopic auxiliary legs (203) can slide freely along the axial direction of the sleeve. Depending on the flatness of the ground, pull the telescopic auxiliary legs (203) down to the appropriate extension length so that the two telescopic auxiliary legs (203) are stably grounded.

[0045] 3. Locked State. Rotate the turnbuckle (209) in the forward direction to make both ends of the turnbuckle (209) retract inward simultaneously, pulling the two clamping sleeves (202) to retract in the horizontal direction. The clamping sleeves (202) deflect slightly inward, clamping the telescopic auxiliary legs (203) inside the tubes radially from both sides, forming a radial friction lock; at the same time, when the clamping sleeves (202) deflect inward, their upper end faces abut against the lower end face of the upper fixed sleeve (201), forming a rigid axial limit, preventing the telescopic auxiliary legs (203) from moving axially. Finally, through the dual action of radial clamping and axial abutment, the extension length of the two telescopic auxiliary legs (203) is reliably locked simultaneously.

[0046] 4. Storage state. Turn the turnbuckle (209) in the opposite direction to unlock it, push the telescopic auxiliary leg (203) back into the sleeve, and then tighten the turnbuckle to complete the fixation; then turn the anti-tipping telescopic locking mechanism (2) to make it fit against the front support leg (1) to complete the overall storage. It is small in size and easy to carry.

[0047] This invention combines a hinged structure with a telescopic locking structure, which takes into account both the flexibility of adjusting the support angle and the extension length. At the same time, it achieves double locking through a single operation, with high locking reliability. It effectively solves the problems of insufficient anti-tipping ability, poor adaptability to terrain and scene, and easy loosening of the traditional tripod ladder.

[0048] The above description is only a preferred embodiment of the present invention. All equivalent structural transformations made in accordance with the concept of the present invention should be included within the protection scope of the present invention.

Claims

1. A front support leg assembly for a tripod with anti-tipping telescopic locking mechanism, comprising a front support leg (1) and an anti-tipping telescopic locking mechanism (2), characterized in that: The upper end of the anti-tipping telescopic locking mechanism (2) is hinged to the front support leg (1) by a connecting bolt (204), so that the anti-tipping telescopic locking mechanism (2) as a whole can rotate around the hinge axis to adjust the support angle. The anti-tipping telescopic locking mechanism (2) includes two upper fixing sleeves (201), two clamping sleeves (202), two telescopic auxiliary legs (203), and a turnbuckle assembly; The two upper fixed sleeves (201) are symmetrically fixed on the left and right, and the two clamping sleeves (202) are coaxially and correspondingly set below the upper fixed sleeves (201). The telescopic auxiliary leg (203) is coaxially inserted into the upper fixed sleeve (201) and the clamping sleeve (202) on the same side, and can slide along the sleeve axis to adjust the extension length. The turnbuckle assembly is horizontally connected between two clamping sleeves (202), and the outer wall of the clamping sleeve (202) is hinged to the end of the turnbuckle assembly. When the turnbuckle assembly is tightened, the two clamping sleeves (202) are deflected inward by horizontal tension, and the inner side of the sleeve wall radially compresses the telescopic auxiliary leg (203) to form a friction lock. At the same time, the upper end face of the clamping sleeve (202) abuts against the lower end face of the upper fixed sleeve (201) to form a rigid limit that restricts the axial sliding of the telescopic auxiliary leg (203), and simultaneously realizes the double locking of the two telescopic auxiliary legs (203).

2. The anti-tipping telescopic locking front support leg assembly for a tripod ladder according to claim 1, characterized in that, The inner diameter of the clamping sleeve (202) is the same as that of the upper fixed sleeve (201), and the outer diameter of the telescopic auxiliary leg (203) is clearance-fitted with the inner diameter of the sleeve.

3. The anti-tipping telescopic locking front support leg assembly for a tripod ladder according to claim 1, characterized in that, An upper fixed sleeve connecting rod (205) is fixedly installed between the two upper fixed sleeves (201).

4. The anti-tipping telescopic locking front support leg assembly for a tripod ladder according to claim 1, characterized in that, A connecting ring (206) is fixedly provided on the outer wall of the clamping sleeve (202), and the end of the turnbuckle assembly is hinged to the clamping sleeve (202) through the connecting ring (206).

5. The anti-tipping telescopic locking front support leg assembly for a tripod ladder according to claim 3, characterized in that, The turnbuckle assembly includes a turnbuckle sleeve (207), a sleeve connecting rod (208), and a turnbuckle (209). The turnbuckle (209) passes through the inside of the turnbuckle sleeve (207), with both ends extending out of the turnbuckle sleeve (207) and connected to the clamping sleeve (202) on the corresponding side. The upper end of the sleeve connecting rod (208) is fixedly connected to the upper fixed sleeve connecting rod (205), and the lower end is fixedly connected to the middle part of the turnbuckle sleeve (207), which is used to limit the corresponding height of the clamping sleeve (202) and the turnbuckle (209).

6. The anti-tipping telescopic locking front support leg assembly for a tripod ladder according to claim 5, characterized in that, When the turnbuckle (209) is rotated, both ends of the turnbuckle (209) simultaneously retract inward or extend outward, driving the two clamping sleeves (202) to move synchronously, thereby achieving synchronous locking and unlocking of the telescopic auxiliary legs (203) on both sides.

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