A ladder with a stable support

Abstract

The present invention provides a stably supported ladder, belonging to the technical field of ladders. It solves the problems existing in existing ladders. Lock buckles are fixedly installed at both ends of each pedal of the ladder, and the pedals are fixed to the ladder legs through telescopic devices on the lock buckles at both ends. The telescopic devices can also be used to adjust the telescopic state of the ladder legs. A gear transmission clamping device is provided on the lock buckle, and the gear transmission clamping device enables the lock buckle to be firmly clamped on the ladder leg. The single-sided ladder and the supporting leg are connected by a locking device, and the locking device keeps the relative position between the single-sided ladder and the supporting leg locked. The ladder also includes an unlocking device for releasing the lock between the single-sided ladder and the supporting leg so that the single-sided ladder and the supporting leg can rotate relative to each other. A universal gripping structure is also provided at the contact end between the ladder leg and the supporting leg and the ground. The present invention is flexible and reliable, has high safety and stability, and is versatile.

Description

Technical Field

[0001] The invention belongs to the technical field of ladders and relates to a stably supported ladder. Background Art

[0002] Ladder, a tool for daily life, is made of two long and thick poles with a horizontal bar suitable for climbing in the middle. It is used to climb up. Ladders are divided into single ladders and herringbone ladders. Herringbone ladders are usually used on flat ground in daily life. In some cases where the ground is uneven, only a modified single ladder is used. This single ladder generally includes a single-sided ladder and a support leg. The triangle state formed between the single-sided ladder and the support leg is used to maintain stability, allowing users to climb and stand on the single ladder stably and safely.

[0003] However, the single-sided ladder and the angle of the support legs of this type of single ladder are fixed and cannot be adjusted. Therefore, the ladder cannot be used on a variety of uneven ground surfaces, lacks flexibility and versatility, and has poor stability. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the existing ladders and to provide a ladder with a stable support having a gear transmission clamping device and a universal gripping structure.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A stably supported ladder comprises a single-sided ladder and a supporting leg, the single-sided ladder comprising two retractable ladder legs and a plurality of pedals arranged between the ladder legs, each pedal being fixedly mounted with a lock buckle at both ends, the pedal being fixed to the ladder leg by a retractable device on the lock buckles at both ends, the retractable device also being used to adjust the retractable state of the ladder leg, characterized in that a gear-driven clamping device is also provided on the lock buckle, the gear-driven clamping device enables the lock buckle to be firmly clamped to the ladder leg, the single-sided ladder and the supporting leg are connected by a locking device, the locking device keeps the relative position between the single-sided ladder and the supporting leg locked, the ladder also comprises an unlocking device for releasing the lock between the single-sided ladder and the supporting leg so that the single-sided ladder and the supporting leg can rotate relative to each other, and a universal gripping structure is also provided at the contact end between the ladder leg and the supporting leg with the ground.

[0007] In the above-mentioned stably supported ladder, an insertion hole for inserting the ladder leg is provided on the locking buckle, a pin hole perpendicular to and passing through the insertion hole and a gear cavity passing through the pin hole are also provided in the locking buckle, a clamping hole corresponding to the pin hole is provided on the ladder leg, and the gear transmission clamping device includes a driving gear, a clamping pin, a pin hole and a gear cavity, the clamping pin is arranged in the above-mentioned pin hole, the driving gear is arranged in the above-mentioned gear cavity, the driving gear is sleeved on a rotating shaft fixedly connected to the locking buckle, a rack matching the driving gear is provided at one end of the clamping pin, and an insertion end that can be inserted into the above-mentioned clamping hole is provided at the other end, and an operating part is also provided on the driving gear extending to the outside of the locking buckle.

[0008] In the above-mentioned stably supported ladder, the gear transmission clamping device is also provided with a limiting structure to keep the clamping state locked, and the limiting structure includes a gear rib arranged on the inner wall of the gear cavity and a limiting block arranged on the driving gear, and the limiting block is located on one side of the gear rib and is elastic.

[0009] In the above-mentioned stably supported ladder, there are two groups of gear transmission clamping devices, which are respectively arranged on both sides of the lock.

[0010] In the above-mentioned stably supported ladder, the locking device includes a fixed gear 1, a fixed gear 2 and an intermediate gear. An extension block is fixedly connected to a pedal, and the extension block is "U"-shaped and includes two legs. A hollow insertion section is provided in each leg. The supporting leg includes a cross bar and a retractable vertical bar perpendicular to the cross bar. The cross bar is arranged between the two legs. The above-mentioned fixed gear 1 is fixedly arranged in each insertion section. One end of the above-mentioned fixed gear 2 is arranged in the insertion section, and the other end is fixedly connected to the cross bar on the supporting leg. The fixed gear 1 and the fixed gear 2 are arranged front and back. The intermediate gear is sleeved inside the fixed gear 1 and the fixed gear 2, and is meshed with the fixed gear 1 and the fixed gear 2 at the same time to form a position locking state between the single-sided ladder and the supporting leg.

[0011] In the above-mentioned stably supported ladder, the unlocking device includes a connecting rod fixedly connected to the intermediate gear, and the other end of the connecting rod is connected to a button. The button is arranged at the front end of the above-mentioned fixed gear one and is circumferentially fixed to the insertion section. The connecting rod can rotate axially in the button, and the button can slide axially so that the intermediate gear only engages with fixed gear one or only with fixed gear two. An elastic member is also arranged between the button and the intermediate gear to reset the intermediate gear, so that the intermediate gear always has a tendency to engage with fixed gear one and fixed gear two at the same time.

[0012] In the above-mentioned stably supported ladder, both ends of the horizontal bar are respectively fixed with inclined rails extending to the vertical bar.

[0013] In the above-mentioned stably supported ladder, the elastic member is a spring, one end of which is connected to the button, and the other end is connected to an end surface of the fixed gear.

[0014] In the above-mentioned stably supported ladder, a double locking structure is also provided on the ladder to prevent the above-mentioned locking device from failing. The double locking structure includes a hook provided on the single-sided ladder and a hook provided on the supporting leg, and also includes a chain belt. The chain belt is provided with a plurality of rings, which are used in conjunction with the hooks, and any two rings can be detachably mounted on the hook of the single-sided ladder and the hook of the supporting leg, respectively.

[0015] In the above-mentioned stably supported ladder, the universal gripping structure includes a bolt, a nut and a gripping claw. The bolt is threadedly connected to the ladder leg or the supporting leg, and a nut is screwed on the bolt. The nut rests on the bottom of the ladder leg or the supporting leg. A universal hole is opened on the gripping claw, and the gripping claw is mounted on the bolt through the universal hole. The gripping claw is arranged between the bolt head and the nut. The diameter of the universal hole is larger than the outer diameter of the bolt stud and smaller than the outer diameter of the bolt head.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The setting of the locking device and the unlocking device allows the support legs to rotate at an adjustable angle relative to the single-sided ladder. After being adjusted to the right position, the state between the two remains locked, which makes the use of the ladder more flexible and reliable.

[0018] 2. The double locking structure can prevent the locking device from failing, providing a double guarantee to prevent the ladder from slipping and improve safety.

[0019] 3. The setting of the gear-driven clamping device enables the lock and the pedal to be more firmly fixed on the ladder leg, thereby improving safety and stability.

[0020] 4. The setting of the universal grip structure enables the ladder to be used on the ground or mountains under different working conditions, realizing the universal grip function and improving the versatility of the ladder. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure is a schematic diagram of the overall structure of the ladder;

[0022] Figure 2 A partial exploded view of the locking device and unlocking device of the ladder;

[0023] Figure 3 A partial cross-sectional view of the locking device and unlocking device of the ladder;

[0024] Figure 4 It is a structural schematic diagram of the gear transmission clamping device;

[0025] Figure 5 It is a structural schematic diagram of the universal grip structure.

[0026] As shown in the figure, 1. single-sided ladder; 2. supporting leg; 3. ladder leg; 4. pedal; 5. horizontal bar; 6. vertical bar; 7. oblique gear; 8. extension block; 9. supporting foot; 10. insertion section; 11. fixed gear 1; 12. fixed gear 2; 13. intermediate gear; 14. connecting rod; 15. button; 16. spring; 17. hook; 18. chain belt; 19. ring; 20. lock buckle; 21. insertion hole; 22. pin hole; 23. gear cavity; 24. clamping hole; 25. driving gear; 26. clamping pin; 27. rotating shaft; 28. rack; 30. operating part; 31. gear rib; 32. limit block; 33. bolt; 34. nut; 35. gripping claw; 36. universal hole; 37. gear transmission clamping device; 38. universal gripping structure; 39. locking device; 40. unlocking device. DETAILED DESCRIPTION

[0027] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0028] like Figure 1-2 As shown, a stably supported ladder comprises a single-sided ladder 1 and a supporting leg 2. The single-sided ladder 1 comprises two retractable ladder legs 3 and a plurality of pedals 4 arranged between the ladder legs 3. The supporting leg 2 comprises a crossbar 5 and a retractable vertical rod 6 perpendicular to the crossbar 5. The two ends of the crossbar are respectively fixed with oblique rails 7 extending to the vertical rod 6. The single-sided ladder 1 and the supporting leg 2 are connected by a locking device 39 so that the relative position between the single-sided ladder 1 and the supporting leg 2 is kept locked. An extension block 8 is arranged on a pedal 4 away from the ground. The extension block 8 is "U"-shaped and comprises two legs 9. A hollow insertion section 10 is arranged in each of the two legs 9. The crossbar 5 is sandwiched between the two legs 9.

[0029] like Figure 1-3 As shown, the locking device 39 includes a coaxially arranged fixed gear 11, a fixed gear 2 12, an intermediate gear 13 and a crossbar 5 of the support leg 2. The fixed gear 11 is an internal gear, fixedly arranged in the above-mentioned insertion section 10, the fixed gear 2 12 is an internal gear, the front end of the fixed gear 2 12 is arranged in the insertion section 10 and located on the rear end of the fixed gear 1 11, the rear end of the fixed gear 2 12 is fixedly connected to the crossbar 5 on the support leg 2, and the intermediate gear 13 is an external gear. Under normal working conditions, the intermediate gear 13 is located inside the fixed gear 1 11 and the fixed gear 2 12, the front end of the intermediate gear 13 is meshed with the fixed gear 1 11, and the rear end of the intermediate gear 13 is meshed with the fixed gear 2 12. In this way, because the fixed gear 1 11 cannot rotate, the crossbar 5 meshed with the fixed gear 1 11 cannot rotate, so the fixed gear 2 12 fixedly connected to the crossbar 5 cannot rotate, and at this time the support rod cannot be rotated, and the positional relationship between the single-sided ladder 1 and the support leg 2 is in a locked state.

[0030] The ladder also includes an unlocking device 40 to release the lock between the single-sided ladder 1 and the supporting leg 2 so that the single-sided ladder 1 and the supporting leg 2 can rotate relative to each other. The unlocking device 40 includes a connecting rod 14 fixedly connected to the intermediate gear 13, and the other end of the connecting rod 14 is connected to a button 15. The connecting rod 14 can rotate axially in the button 15. The button 15 is arranged at the front end of the fixed gear 11 and cooperates with the insertion section 10 through a flat key so that the button 15 is fixed in the circumferential direction. The button 15 can slide along the axial direction of the button 15 so that the intermediate gear 13 is only meshed with the fixed gear 11 or only with the fixed gear 2 12. A spring 16 is also arranged between the button 15 and the intermediate gear 13 to reset the intermediate gear 13. One end of the spring 16 is connected to the button 15, and the other end is connected to the end face of the fixed gear 11. The spring 16 resets the intermediate gear 13 so that it always has a tendency to mesh with the fixed gear 11 and the fixed gear 2 12 at the same time.

[0031] When unlocking is required, the button 15 can be pressed or pulled outward to move the button 15 outward or inward with the intermediate gear 13. The outward movement causes the intermediate gear 13 to disengage from the fixed gear 2 12 and only engage with the fixed gear 1 11. At this time, the support leg 2 can be rotated at will to adjust the angle between the single-sided ladder 1 and the support leg 2; the inward movement causes the intermediate gear 13 to disengage from the fixed gear 1 11 and only engage with the fixed gear 2 12. At this time, the support leg 2 can be rotated at will to adjust the angle between the single-sided ladder 1 and the support leg 2; when the angle is adjusted to the right position, the button 15 is released to slide along the axial direction of the button 15, and the intermediate gear 13 is reset to the tendency of being simultaneously engaged with the fixed gear 1 11 and the fixed gear 2 12 under the action of the spring 16. At this time, the positional relationship between the single-sided ladder 1 and the support leg 2 is in a locked state.

[0032] like Figure 1 As shown, the ladder is also provided with a double locking structure to prevent the above-mentioned locking device 39 from failing, and the double locking structure includes a hook 17 arranged on the single-sided ladder 1 and a hook 17 arranged on the supporting leg 2, and both ends of a chain belt 18 are detachably mounted on the above-mentioned hook 17, and a plurality of rings 19 that can be mounted on the above-mentioned hook 17 are arranged in series on the chain belt 18.

[0033] like Figure 1 and Figure 4As shown, each pedal 4 is fixedly installed with a lock 20 at both ends, and the pedal 4 is fixed to the ladder leg 3 through the telescopic devices on the locks 20 at both ends. The telescopic devices can also be used to adjust the telescopic state of the ladder leg 3. The lock 20 is also provided with a gear transmission clamping device 37, which enables the lock 20 to be firmly clamped to the ladder leg 3. The lock buckle 20 is provided with an insertion hole 21 for inserting the ladder leg 3. The lock buckle 20 is also provided with a pin hole 22 which is perpendicular to and passes through the insertion hole 21 and a gear cavity 23 which passes through the pin hole 22. The ladder leg 3 is provided with a clamping hole 24 corresponding to the pin hole 22. The gear transmission clamping device 37 includes a driving gear 25, a clamping pin 26, a pin hole 22 and a gear cavity 23. The clamping pin 26 is arranged in the above-mentioned pin hole 22, and the driving gear 25 is arranged in the above-mentioned gear cavity 23. The driving gear 25 is sleeved on a rotating shaft 27 fixedly connected to the lock buckle 20. One end of the clamping pin 26 is provided with a rack 28 which matches the driving gear 25, and the other end has an insertion end which can be inserted into the above-mentioned clamping hole 24. An operating part 30 is also provided on the driving gear 25 extending to the outside of the lock buckle 20.

[0034] When it is necessary to lock the lock buckle 20 with the pedal 4 and hold it tightly on the ladder leg 3, the operating part 30 is toggled to rotate the driving gear 25, and the driving gear 25 engages with the rack 28 to drive the holding pin 26 to move along the pin hole 22, so that the holding pin 26 is inserted into the holding hole 24 on the ladder leg 3, so that the lock buckle 20 is more firmly fixed on the ladder leg 3.

[0035] The gear transmission clamping device 37 has two groups, which are respectively arranged on both sides of the lock buckle 20. In this way, the force can be shared and made more uniform, so that the lock buckle 20 and the pedal 4 are more firmly fixed on the ladder leg 3.

[0036] The gear transmission clamping device 37 is also provided with a limiting structure to keep the clamping state locked, and the limiting structure includes a shift rib 31 provided on the inner wall of the gear cavity 23 and a limiting block 32 provided on the driving gear 25, and the limiting block 32 is elastic. When the gear is rotated, the limiting block 32 rotates with the gear, and passes over the shift rib 31 after being compressed by the shift rib 31. When the gear stops rotating, the limiting block 32 is located on the other side of the shift rib 31. Without external force, the limiting block 32 cannot return to its original position by passing over the shift rib 31. In this way, the clamping state can be kept locked.

[0037] like Figure 1 and Figure 5As shown, the end of the ladder leg 3 and the support leg 2 that contacts the ground is also provided with a universal gripping structure 38. The universal gripping structure 38 comprises a bolt 33, a nut 34 and a gripping claw 35. The bolt 33 is threadedly connected with the ladder leg 3 or the support leg 2. The nut 34 is screwed on the bolt 33. The nut 34 abuts against the bottom of the ladder leg 3 or the support leg 2. The gripping claw 35 is provided with a universal hole 36. The gripping claw 35 is sleeved on the bolt 33 through the universal hole 36. The gripping claw 35 is provided between the head of the bolt 33 and the nut 34. The diameter of the universal hole 36 is larger than the outer diameter of the stud of the bolt 33 and smaller than the outer diameter of the head of the bolt 33.

[0038] When working, the gripping claw 35 is supported on the ground, and the nut 34 is against the bottom of the ladder leg 3 or the supporting leg 2. When the height of the ladder needs to be adjusted, the nut 34 can be rotated. According to different terrains, since the universal hole 36 is larger than the outer diameter of the stud of the bolt 33, the gripping claw 35 can be rotated to adjust the angle of the gripping claw 35 relative to the bolt 33, thereby realizing the universal gripping function.

[0039] It should be understood that in the claims and description of the present invention, all "including..." should be understood as an open-ended meaning, that is, its meaning is equivalent to "at least contains...", and should not be understood as a closed meaning, that is, its meaning should not be understood as "only includes...".

[0040] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A stably supported ladder, comprising a single-sided ladder and a supporting leg, wherein the single-sided ladder comprises two retractable ladder legs and a plurality of pedals arranged between the ladder legs, each pedal having locks fixedly mounted at both ends, the pedal being fixed to the ladder leg through a retractable device on the locks at both ends, the retractable device also being used to adjust the retractable state of the ladder leg, characterized in that: The lock buckle is also provided with a gear transmission clamping device, which enables the lock buckle to firmly clamp on the ladder leg, and the single-sided ladder and the supporting leg are connected by a locking device, which keeps the relative position between the single-sided ladder and the supporting leg locked. The ladder also includes an unlocking device for releasing the lock between the single-sided ladder and the supporting leg so that the single-sided ladder and the supporting leg can rotate relative to each other. The ladder leg and the supporting leg are also provided with a universal gripping structure at the contact end with the ground. The locking device includes a fixed gear 1, a fixed gear 2 and an intermediate gear. An extension block is fixedly connected to a pedal, and the extension block is "U"-shaped, including two legs, and hollow insertion sections are provided in both legs. The supporting leg includes a cross bar and a retractable vertical rod perpendicular to the cross bar. The cross bar is arranged between the two legs, and the above-mentioned fixed gear 1 is fixedly arranged in each insertion section, and one end of the above-mentioned fixed gear 2 is arranged on the insertion section. The locking clasp is provided with an insertion hole for inserting the ladder leg, and the locking clasp is also provided with a pin hole which is perpendicular to and passes through the insertion hole, and a gear cavity which passes through the pin hole. A clamping hole corresponding to the pin hole is provided on the ladder leg. The gear transmission clamping device comprises a driving gear, a clamping pin, a pin hole and a gear cavity. The clamping pin is arranged in the above-mentioned pin hole, and the driving gear is arranged in the above-mentioned gear cavity. The driving gear is sleeved on a rotating shaft fixedly connected to the locking clasp. A rack which matches the driving gear is provided at one end of the clamping pin, and an insertion end which can be inserted into the above-mentioned clamping hole is provided at the other end. An operating part is also provided on the driving gear which extends to the outside of the locking clasp.

2. A stably supported ladder according to claim 1, characterized in that: The gear transmission clamping device is also provided with a limiting structure to keep the clamping state locked, and the limiting structure includes a gear rib arranged on the inner wall of the gear cavity and a limiting block arranged on the driving gear. The limiting block is located on one side of the gear rib and is elastic.

3. A stably supported ladder according to claim 1, characterized in that: There are two groups of gear transmission clamping devices, which are respectively arranged on both sides of the lock buckle.

4. A stably supported ladder according to claim 1, characterized in that: The unlocking device includes a connecting rod fixedly connected to the intermediate gear, and the other end of the connecting rod is connected to a button. The button is arranged at the front end of the above-mentioned fixed gear one and is circumferentially fixed to the insertion section. The connecting rod can rotate axially in the button, and the button can slide axially so that the intermediate gear only meshes with the fixed gear one or only with the fixed gear two. An elastic member is also arranged between the button and the intermediate gear to reset the intermediate gear, so that the intermediate gear always has a tendency to mesh with the fixed gear one and the fixed gear two at the same time.

5. A stably supported ladder according to claim 1, characterized in that: The two ends of the crossbar are respectively fixed with oblique bars extending to the vertical bars.

6. A stably supported ladder according to claim 4, characterized in that: The elastic member is a spring, one end of which is connected to the button, and the other end of which is connected to an end surface of the fixed gear.

7. A stably supported ladder according to claim 1, characterized in that: The ladder is also provided with a double locking structure to prevent the above-mentioned locking device from failing. The double locking structure includes a hook arranged on the single-sided ladder and a hook arranged on the supporting leg, and also includes a chain belt. The chain belt is provided with a plurality of rings, which are used in conjunction with the hooks. Any two rings can be detachably mounted on the hook of the single-sided ladder and the hook of the supporting leg respectively.

8. A stably supported ladder according to claim 1, characterized in that: The universal gripping structure includes a bolt, a nut and a gripping claw. The bolt is threadedly connected to the ladder leg or the support leg. A nut is screwed on the bolt, and the nut rests on the bottom of the ladder leg or the support leg. A universal hole is opened on the gripping claw. The gripping claw is sleeved on the bolt through the universal hole. The gripping claw is set between the bolt head and the nut. The diameter of the universal hole is larger than the outer diameter of the bolt stud and smaller than the outer diameter of the bolt head.

Images