Self-unlocking type extension ladder

Abstract

The utility model relates to the technical field of extension ladders, in particular to a self-unlocking extension ladder, which comprises a support plate and a first support, the first support is fixedly connected to the outer wall of the support plate on the left side, a reinforcing mechanism is arranged in the first support, the support plate is fixedly connected with the end part of a sleeve, a support rod is slidably connected in the sleeve, and a locking mechanism is arranged in the support rod. A second support is fixedly connected to the outer wall of the sleeve, and a self-unlocking mechanism is arranged in the second support. A bolt for connecting a second lantern ring and a supporting rod is loosened, so that the second lantern ring can slide on the outer wall of the supporting rod, sleeves on the two sides are pulled, the angle between the sleeves on the two sides is decreased, the sleeves drive a second support to move, and then hemisphere blocks on the two sides make contact with each other and drive each other to move in the movement process of the two sleeves. The end of the locking rod is separated from the groove formed in the supporting rod, the locking rod does not clamp and fix the supporting rod any more, the supporting rod shrinks into the sleeve under the action of weight, and shrinkage is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of telescopic ladders, in particular to a self-locking telescopic ladder. Background Technique

[0002] Ladders are tools used in people's daily lives. Currently, when many repairing and maintenance equipment are involved, telescopic ladders are often needed.

[0003] For example, the folding telescopic ladder with the patent number CN218598144U includes a front telescopic ladder, a rear telescopic ladder, a pulling belt and a safety rod. The front telescopic ladder includes multiple interconnected front ladder sections, and adjacent two front ladder sections can telescopically move relative to each other. Each front ladder section is provided with a front tread bar. The rear telescopic ladder includes multiple interconnected rear ladder sections. However, the above document still has deficiencies. When in use, the front telescopic ladder and the rear telescopic ladder have telescopic functions, with the advantages of small occupied space after folding and easy to carry, etc. of telescopic ladders. At the same time, the front telescopic ladder and the rear telescopic ladder can be unfolded and folded relative to each other, enabling the ladder to stand by itself, etc. of folding ladders. Moreover, the front telescopic ladder and the rear telescopic ladder are connected by a pulling belt and a safety rod to prevent accidental separation in the unfolded state, greatly improving safety. However, for existing telescopic ladders, generally, it is necessary to manually press the button at the connection block of the telescopic ladder to retract the positioning part to facilitate retracting each rod body. When in use, it is not convenient to achieve automatic contraction of the telescopic ladder. At the same time, the support position of the telescopic ladder on the ground is prone to slipping during use, resulting in a change in the opening angle of the telescopic ladder, and thus prone to safety accidents. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problem that it is not convenient to achieve automatic contraction of the telescopic ladder, and a self-locking telescopic ladder is proposed.

[0005] To achieve the above purpose, the utility model provides the following technical solution:

[0006] Design a self-locking telescopic ladder, including a support plate and a first bracket. The first bracket is fixedly connected to the outer wall of the left support plate. A reinforcement mechanism is arranged inside the first bracket. The support plate is fixedly connected to the end of a sleeve. A support rod is slidably connected inside the sleeve. The outer wall of the sleeve is fixedly connected to a second bracket. A self-locking mechanism is arranged inside the second bracket.

[0007] Preferably, the self-unlocking mechanism includes a support rod and a spring, the outer wall of the support rod is slidably connected to the second bracket, one end of the support rod is fixedly connected to a hemisphere, the other end of the support rod is fixedly connected to a first rack, the first rack is meshed with a gear, the gear is rotatably connected to the second bracket through a bearing, the gear is meshed with the second rack, the outer walls of the second rack and the first rack are both slidably connected to the second bracket, the spring is arranged inside the second bracket, the two ends of the spring are fixedly connected to the second rack and the second bracket respectively, the end of the second rack is fixedly connected to a locking rod, the outer wall of the locking rod is slidably connected to the second bracket and the sleeve, and the end of the locking rod is clamped with a groove arranged in the support rod.

[0008] Preferably, the reinforcement mechanism includes a worm, the outer walls at both ends of the worm are rotatably connected to the first bracket via bearings, a handle is fixedly connected to the end of the worm, the worm is meshingly connected to the worm wheel, a winding roller is fixedly connected below the worm wheel, the outer walls at both ends of the winding roller are rotatably connected to the first bracket via bearings, a steel wire rope is wound around the outer wall of the winding roller, and the end of the steel wire rope is fixedly connected to the support plate on the right side.

[0009] Preferably, a first ring is fixedly connected to the outer wall of the sleeve by bolts, and a first pedal is fixedly connected between the front and rear first rings.

[0010] Preferably, a second ring is fixedly connected to the outer wall of the support rod by bolts, and a second pedal is fixedly connected between the front and rear second rings.

[0011] Preferably, a bottom plate is rotatably connected to the front and rear support plates through a pin shaft.

[0012] The utility model provides a self-locking telescopic ladder, which has the following beneficial effects: through the cooperation among the support rod, the hemispherical block, the first rack, the gear, the second rack, the spring and the locking rod, the bolts connecting the second ring and the support rod are loosened, so that the second ring can slide on the outer wall of the support rod, the sleeves on both sides are pried, the angle between the sleeves on both sides becomes smaller, the sleeve drives the second bracket to move, and then the hemispherical blocks on both sides of the two sleeves contact and drive each other to move during the movement, the end of the locking rod is separated from the groove set in the support rod, the locking rod no longer clamps and fixes the support rod, and the support rod shrinks to the inside of the sleeve under the action of weight to achieve contraction, which is convenient for achieving automatic contraction of the telescopic ladder when in use.

[0013] Through the cooperation among the worm, the handle, the worm wheel, the winding roller and the steel wire rope, the handle drives the worm to rotate, the worm drives the worm wheel to rotate, the worm wheel drives the winding roller to rotate, the winding roller winds the steel wire rope, the steel wire rope pulls the support plate on the right side, and when the steel wire rope is in a tensioned state, stop rotating the handle. The steel wire rope tightens the support plates on both sides, preventing the two support plates from moving away from each other, thereby preventing the telescopic ladder from deforming and preventing the telescopic ladder from slipping at the support position on the ground during use. The opening angle of the telescopic ladder will not change, and thus it is not easy to cause safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural view of the present utility model;

[0015] Figure 2 is a structural sectional view of the present utility model;

[0016] Figure 3 is a schematic structural view of the connection of the support plate, the first pedal and the bottom plate in the present utility model;

[0017] Figure 4 is a schematic structural view of the connection of the bottom plate, the support plate and the first bracket in the present utility model;

[0018] Figure 5 is a schematic structural view of the connection of the first rack, the gear and the second rack in the present utility model;

[0019] Figure 6 is a schematic structural view of the connection of the bottom plate, the first bracket and the support plate in the present utility model.

[0020] In the figure: 1, support plate; 2, first bracket; 3, self-locking mechanism, 301, support rod; 302, hemispherical block; 303, first rack; 304, gear; 305, second rack; 306, spring; 307, lock rod; 4, reinforcement mechanism, 401, worm; 402, handle; 403, worm wheel; 404, winding roller; 405, steel wire rope; 5, sleeve; 6, support rod; 7, second bracket; 8, first collar; 9, first pedal; 10, second collar; 11, second pedal; 12, bottom plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present utility model will be further described below with reference to the accompanying drawings:

[0022] Refer to the attached Figure 1-6: In this embodiment, a self-unlocking telescopic ladder includes a support plate 1 and a first bracket 2. The first bracket 2 is fixedly connected to the outer wall of the left support plate 1. A reinforcement mechanism 4 is arranged inside the first bracket 2. The reinforcement mechanism 4 prevents the angle of the telescopic ladder from changing during use. The support plate 1 is fixedly connected to the end of a sleeve 5. A support rod 6 is slidably connected inside the sleeve 5. The support rod 6 slides inside the sleeve 5. A second bracket 7 is fixedly connected to the outer wall of the sleeve 5. A self-unlocking mechanism 3 is arranged inside the second bracket 7. The self-unlocking mechanism 3 realizes the automatic contraction of the telescopic ladder;

[0023] A first collar 8 is fixedly connected to the outer wall of the sleeve 5 by bolts. The position of the first collar 8 can be adjusted. A first pedal 9 is fixedly connected between the front and rear first collars 8. A second collar 10 is fixedly connected to the outer wall of the support rod 6 by bolts. The position of the second collar 10 on the outer wall of the support rod 6 can be adjusted. A second pedal 11 is fixedly connected between the front and rear second collars 10. A bottom plate 12 is rotatably connected to the lower part of the front and rear support plates 1 by pins. The bottom plate 12 supports the front and rear support plates 1.

[0024] The self-unlocking mechanism 3 includes a support rod 301, a hemispherical block 302, a first rack 303, a gear 304, a second rack 305, a spring 306, and a locking rod 307. The outer wall of the support rod 301 is slidably connected to the second bracket 7. The support rod 301 slides inside the second bracket 7. A hemispherical body 302 is fixedly connected to one end of the support rod 301. The hemispherical block 302 drives the movement of the support rod 301. A first rack 303 is fixedly connected to the other end of the support rod 301. The first rack 303 drives the sliding of the support rod 301. The first rack 303 is meshed with the gear 304. The first rack 303 drives the rotation of the gear 304. The gear 304 is rotatably connected to the second bracket 7 by a bearing. The gear 304 is meshed with the second rack 305. The gear 304 drives the sliding of the second rack 305. The outer walls of the second rack 305 and the first rack 303 are both slidably connected to the second bracket 7;

[0025] The spring 306 is arranged inside the second bracket 7. The model of the spring 306 is selected according to the use requirements as long as it meets the working needs. Both ends of the spring 306 are fixedly connected to the second rack 305 and the second bracket 7 respectively. A locking rod 307 is fixedly connected to the end of the second rack 305. The second rack 305 drives the sliding of the locking rod 307. The outer wall of the locking rod 307 is slidably connected to the second bracket 7 and the sleeve 5. The end of the locking rod 307 is engaged with a groove arranged inside the support rod 6. The locking of the locking rod 307 with the groove arranged inside the support rod 6 fixes the support rod 6 inside the sleeve 5 by clamping;

[0026] Loosen the bolts connecting the second set of rings 10 to the support rod 6 so that the second set of rings 10 can slide on the outer wall of the support rod 6. Bend the sleeves 5 on both sides, and the angle between the two sleeves 5 becomes smaller. The sleeves 5 drive the second bracket 7 to move. Then, during the movement of the two sleeves 5, the hemispherical blocks 302 on both sides come into contact and drive each other to move. The end of the locking rod 307 separates from the groove provided inside the support rod 6, and the locking rod 307 no longer clamps and fixes the support rod 6. Under the action of its own weight, the support rod 6 retracts into the inside of the sleeve 5, achieving contraction. When in use, it is convenient to realize the automatic contraction of the telescopic ladder.

[0027] The reinforcement mechanism 4 includes a worm 401, a handle 402, a worm gear 403, a winding roller 404, and a steel wire rope 405. The outer walls at both ends of the worm 401 are rotatably connected to the first bracket 2 through bearings. A handle 402 is fixedly connected to the end of the worm 401. The handle 402 drives the worm 401 to rotate. The worm 401 is meshed with the worm gear 403, and the worm 401 drives the worm gear 403 to rotate. A winding roller 404 is fixedly connected below the worm gear 403. The worm gear 403 drives the winding roller 404 to rotate. The outer walls at both ends of the winding roller 404 are rotatably connected to the first bracket 2 through bearings. The steel wire rope 405 is wound around the outer wall of the winding roller 404. The winding roller 404 winds up the steel wire rope 405. The end of the steel wire rope 405 is fixedly connected to the right support plate 1. The steel wire rope 405 drives the right support plate 1 to move.

[0028] The handle 402 drives the worm 401 to rotate. The worm 401 drives the worm gear 403 to rotate. The worm gear 403 drives the winding roller 404 to rotate. The winding roller 404 winds up the steel wire rope 405. When the steel wire rope 405 is in a taut state, stop turning the handle 402. The steel wire rope 405 tightens the two support plates 1, preventing the two support plates 1 from moving away from each other. Furthermore, it prevents the telescopic ladder from deforming, and prevents the telescopic ladder from slipping at the support position on the ground during use. The opening angle of the telescopic ladder will not change, and thus it is not easy to cause safety accidents.

[0029] Working principle:

[0030] When the self-unlocking telescopic ladder is in use, manually push the hemispherical block 302. The hemispherical block 302 drives the support rod 301 to move. The support rod 301 drives the first rack 303 to slide. The first rack 303 drives the gear 304 to rotate. The gear 304 drives the second rack 305 to slide. The second rack 305 drives the locking rod 307 to slide and compresses the spring 306. The end of the locking rod 307 separates from the groove provided inside the support rod 6. Slide the support rod 6 and adjust the support rod 6 to the required position. Release the hemispherical block 302. Under the elastic action of the spring 306, the second rack 305 slides in the reverse direction. The locking rod 307 slides in the reverse direction and inserts the end of the locking rod 307 into the groove provided inside the support rod 6 to clamp and fix the support rod 6 inside the sleeve 5.

[0031] Using stage of the retractable ladder:

[0032] Place the retractable ladder at the required position. The support plate 1 contacts the ground. Bend the retractable ladder to the required angle. Rotate the handle 402. The handle 402 drives the worm 401 to rotate. The worm 401 drives the worm gear 403 to rotate. The worm gear 403 drives the winding roller 404 to rotate. The winding roller 404 winds the steel wire rope 405. When the steel wire rope 405 is in a tensioned state, stop rotating the handle 402. The steel wire rope 405 tightens the two side support plates 1, preventing the two support plates 1 from moving away from each other, thus preventing the retractable ladder from deforming and preventing the retractable ladder from slipping at the support position on the ground during use. The opening angle of the retractable ladder will not change, thus not easily causing safety accidents. Fix the first socket head 8 at the required position on the outer wall of the sleeve 5 through bolts, thereby fixing the position of the first pedal 9. Fix the second collar 10 on the outer wall of the support rod 6 through bolts, thereby fixing the position of the second pedal 11. The user steps on the first pedal 9 and the second pedal 11 to climb up and use the retractable ladder;

[0033] Retracting stage of the retractable ladder:

[0034] Loosen the bolts connecting the second collar 10 and the support rod 6 so that the second collar 10 can slide on the outer wall of the support rod 6. Bend the two side sleeves 5. The angle between the two side sleeves 5 becomes smaller. The sleeve 5 drives the second bracket 7 to move. Thus, during the movement of the two sleeves 5, the hemispherical blocks 302 on both sides contact and drive each other to move. The end of the locking rod 307 separates from the groove provided inside the support rod 6. The locking rod 307 no longer clamps and fixes the support rod 6. The support rod 6 shrinks into the sleeve 5 under the action of its own weight, realizing the retraction. During use, it is convenient to realize the automatic retraction of the retractable ladder, thus realizing the use of the self-locking retractable ladder.

[0035] Although the present utility model has been illustrated and described with reference to the preferred embodiments, those of ordinary skill in the art should understand that various changes in form and details may be made within the scope of the claims.

Claims

1. A self-locking telescopic ladder, comprising a support plate (1) and a first bracket (2), wherein the first bracket (2) is fixedly connected to the outer wall of the left support plate (1), characterized in that: A reinforcing mechanism (4) is provided inside the first bracket (2); the support plate (1) is fixedly connected to the end of the sleeve (5); a support rod (6) is slidably connected inside the sleeve (5); the outer wall of the sleeve (5) is fixedly connected to the second bracket (7); a self-unlocking mechanism (3) is provided inside the second bracket (7); the self-unlocking mechanism (3) comprises a support rod (301) and a spring (306); the outer wall of the support rod (301) is slidably connected to the second bracket (7); one end of the support rod (301) is fixedly connected to a hemisphere (302); the other end of the support rod (301) is fixedly connected to a first rack (303); the first rack (303) is meshed with a gear (304) The gear (304) is rotatably connected to the second bracket (7) through a bearing, the gear (304) is meshed with the second rack (305), the outer walls of the second rack (305) and the first rack (303) are both slidably connected to the second bracket (7), the spring (306) is arranged inside the second bracket (7), the two ends of the spring (306) are respectively fixedly connected to the second rack (305) and the second bracket (7), the end of the second rack (305) is fixedly connected with a locking rod (307), the outer wall of the locking rod (307) is slidably connected to the second bracket (7) and the sleeve (5), and the end of the locking rod (307) is clamped with a groove arranged in the support rod (6).

2. The self-locking telescopic ladder according to claim 1, characterized in that: The reinforcing mechanism (4) comprises a worm (401), the outer walls at both ends of the worm (401) are rotatably connected to the first bracket (2) via bearings, a handle (402) is fixedly connected to the end of the worm (401), the worm (401) is meshingly connected to a worm wheel (403), a winding roller (404) is fixedly connected below the worm wheel (403), the outer walls at both ends of the winding roller (404) are rotatably connected to the first bracket (2) via bearings, a steel wire rope (405) is wound around the outer wall of the winding roller (404), and the end of the steel wire rope (405) is fixedly connected to the right support plate (1).

3. The self-locking telescopic ladder according to claim 2, characterized in that: The outer wall of the sleeve (5) is fixedly connected to a first sleeve ring (8) by means of bolts, and a first pedal (9) is fixedly connected between the front and rear first sleeve rings (8).

4. The self-locking telescopic ladder according to claim 3, characterized in that: The outer wall of the support rod (6) is fixedly connected to a second sleeve ring (10) by means of bolts, and a second pedal (11) is fixedly connected between the front and rear second sleeve rings (10).

5. The self-locking telescopic ladder according to claim 4, characterized in that: The bottom of the front and rear support plates (1) are rotatably connected with a bottom plate (12) via a pin shaft.

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