Crawling ladder capable of being automatically folded and unfolded

Abstract

The utility model relates to the technical field of ladder stand equipment, and particularly discloses an automatically retractable ladder stand which comprises a ladder stand body, a fixing rod, a connecting rod and a driving mechanism, the ladder stand body comprises two parallel vertical rods and a plurality of pedal rods perpendicularly connected with the two vertical rods, the fixing rod is used for being fixedly installed on the side wall of a carriage in the vertical direction, and the connecting rod is used for being connected with the connecting rod. The two fixing pieces are arranged in the transverse direction at intervals. One ends of the connecting rods are rotatably connected with the fixing rods, the multiple connecting rods are arranged in parallel at intervals in the vertical direction, the ends, away from the fixing rods, of the connecting rods on the same fixing rod are rotatably connected with the same vertical rod, and the connecting rods rotate in the transverse direction; and the driving mechanism is used for driving the connecting rod to rotate. The ladder stand has the effect that the problem that a temporarily-hung ladder stand is inconvenient to use is solved.

Description

Technical Field

[0001] The present application relates to the technical field of ladder equipment, and in particular to a ladder that can be automatically retracted and extended. Background Art

[0002] The body of a van is generally high, and ladders are used in maintenance and loading and unloading operations. At present, most ladders are fixed to the side wall of the carriage through a connecting rod perpendicular to the side wall of the carriage. In order to ensure stability when stepping on it, the ladder fixed to the side wall of the carriage is far away from the side wall of the carriage. There is a risk of scratching passing vehicles and pedestrians during driving, which poses a certain safety hazard.

[0003] In this regard, there are also operations on the market where ladders are temporarily hung on the side walls of the carriage, and the ladders are removed after use. This temporary hanging method not only needs to consider the safety and stability of the hanging, but also the convenience of carrying the ladder, which causes inconvenience in use. Utility Model Content

[0004] In order to improve the problem of inconvenience in using a temporary hanging ladder, the present application provides a ladder that can be automatically retracted.

[0005] The present application provides an automatically retractable ladder using the following technical solution:

[0006] A ladder that can be automatically retracted and extended comprises a ladder body, a fixed rod, a connecting rod and a driving mechanism, wherein the ladder body comprises two parallel vertical rods and a plurality of pedal rods vertically connecting the two vertical rods, the fixed rod is used to be fixedly installed on the side wall of a carriage along the vertical direction, and two of the fixed rods are arranged at intervals along the horizontal direction; one end of the connecting rod is rotatably connected to the fixed rod, and a plurality of connecting rods are arranged vertically parallel and at intervals, an end of the connecting rod on the same fixed rod away from the fixed rod is rotatably connected to the same vertical rod, and the connecting rod rotates along the horizontal direction; the driving mechanism is used to drive the connecting rod to rotate.

[0007] By adopting the above technical solution, during installation, the fixing rod is fixedly installed on the side wall of the car, and then the ladder body is connected to the fixing rod through the connecting rod. When in use, the connecting rod is driven downward by the driving mechanism to rotate, so that the ladder body is unfolded, and then the staff can use the ladder to climb; when the ladder body is used up, the connecting rod is driven upward by the driving mechanism, so that the ladder body can be folded and stored, which does not affect the normal driving of the vehicle and reduces safety hazards; compared with the method of using a temporary hanging ladder, the ladder that can be automatically retracted and released in this application is more convenient to use, and has higher safety and reliability.

[0008] Optionally, the driving mechanism includes a telescopic member, one end of the telescopic member is rotatably connected to the side wall of the carriage, the other end of the telescopic member is rotatably connected to the ladder body, and the rotation plane of the telescopic member is parallel to the rotation plane of the connecting rod.

[0009] By adopting the above technical solution, the ladder body can be driven away from the fixed rod by driving the telescopic member to extend as a whole, thereby driving the connecting rod to rotate downward, thereby realizing the functional requirement of the driving mechanism driving the connecting rod to rotate, with a simple structure and easy use.

[0010] Optionally, a limit block is provided at the bottom of the connecting rod close to one side of the fixing rod.

[0011] By adopting the above technical solution, the setting of the limit block allows the connection rod to rotate downward to a certain angle, and the limit block abuts against the fixed rod to limit the angle of the connection rod to rotate downward, so that the ladder body will not fall when stepped on by the staff. The structure is simple and practical.

[0012] Optionally, the driving mechanism includes a compression spring and a fixing assembly, one end of the compression spring is connected to the limit block, and the other end of the compression spring is connected to the fixing rod, and the compression spring tends to open the connecting rod and the fixing rod; the fixing assembly is used to lock the rotational position of the connecting rod.

[0013] By adopting the above technical solution, when the ladder is needed, the lock of the connecting rod by the fixing assembly is released, and the connecting rod is opened with the fixing rod under the elastic force of the return spring, that is, the connecting rod is rotated downward, so that the ladder body is opened; after the use of the ladder body, the connecting rod is rotated upward so that the ladder body is folded and retracted, and then the position of the connecting rod is locked by the fixing assembly, and the return spring is used as the power source for rotating the connecting rod, which has a simple structure and low cost.

[0014] Optionally, the fixing assembly includes a ratchet, a pawl and a return spring, the connecting rod is rotatably connected to the fixed rod via a rotating shaft, the ratchet is coaxially connected to one end of the rotating shaft; the pawl is rotatably connected to the fixed rod, one end of the return spring is connected to the pawl, and the other end of the return spring is connected to the fixed rod, the return spring causes the pawl to tend to engage between the ratchet teeth of the ratchet, and the pawl is used to limit the opening of the connecting rod and the fixed rod.

[0015] By adopting the above technical solution, before the connecting rod is rotated downward, it is necessary to overcome the elastic force of the reset spring to disengage the pawl from the ratchet, and the pawl no longer restricts the downward rotation of the ratchet. At this time, the connecting rod can automatically rotate downward under the elastic force of the compression spring; when the connecting rod needs to be locked, no force is applied to the pawl, and the pawl automatically engages with the ratchet under the action of the reset spring, so that the ratchet no longer rotates, thereby locking the position of the connecting rod.

[0016] Optionally, the pawl is rotatably connected to the fixed rod via an integrally formed rotating rod, and the rotating rod is provided with a locking component for locking the rotating rod.

[0017] By adopting the above technical solution, the rotating rod and the locking component are jointly arranged so that the pawl can be locked, thereby reducing the probability that the pawl rotates due to vibration or the like during driving of the vehicle, causing the pawl and the ratchet to disengage from the engagement state and causing the connecting rod and the fixing rod to open abnormally, thereby reducing safety hazards.

[0018] Optionally, the locking component includes a turning handle and a locking block, one end of the turning handle is rotatably connected to the turning rod, the locking block is arranged on the turning handle, and a slot is provided on the fixed rod corresponding to the locking block, and the locking block can be rotated until it is tightly engaged in the slot.

[0019] By adopting the above technical solution, when the pawl and the ratchet are in an engaged state, the rotating handle is rotated so that the locking block on the rotating handle is tightly engaged in the slot on the fixed rod, thereby limiting the rotation of the pawl and achieving the functional requirement of locking the rotating rod. The structure is simple and easy to use.

[0020] Optionally, a protective pad is provided on the peripheral wall of the pedal rod.

[0021] By adopting the above technical solution, the provision of the protection pad can protect the pedal rod, reduce the damage caused by the pedal rod being stepped on, and extend the service life.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. The matching arrangement of the ladder body, the fixing rod, the connecting rod and the driving mechanism enables the ladder body to be used by only driving the connecting rod to rotate downward through the driving mechanism, thereby driving the ladder body away from the fixing rod, that is, the ladder body away from the side wall of the vehicle compartment; when the ladder body is used, the driving mechanism drives the connecting rod to rotate upward again until the ladder body is folded back onto the side wall of the vehicle. Compared with the temporary hanging ladder method, it is more convenient to use, safer and more reliable;

[0024] 2. The telescopic member is set so that the ladder body can be driven away from or close to the vehicle side wall by adjusting the length of the telescopic rod, thereby driving the connecting rod to rotate upward or downward, thereby realizing the functional requirement of the driving mechanism driving the connecting rod to rotate, with a simple structure and easy use;

[0025] 3. The matching arrangement of the compression spring and the fixing assembly enables the connecting rod to automatically rotate downward under the elastic force of the compression spring after the fixing assembly releases the locking of the connecting rod's rotational position. The compression spring is used as the power source for the connecting rod to rotate downward, and the structure is simple and the cost is low. When the ladder body needs to be locked, it is only necessary to lock the rotational position of the connecting rod through the fixing assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a schematic diagram of the overall structure when the ladder in Example 1 of the present application is installed on the side wall of the carriage;

[0028] Figure 2 yes Figure 1 The schematic diagram of the structure of the middle ladder body, fixed rod and connecting rod is intended to show the structure, position and connection relationship of the three;

[0029] Figure 3 It is a schematic structural diagram of the ladder body, the fixing rod and the connecting rod in Example 2 of the present application;

[0030] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure of part A.

[0031] Figure numerals: 1. ladder body; 11. vertical rod; 12. pedal rod; 13. protection pad; 2. fixing rod; 21. slot; 3. connecting rod; 31. rotating shaft; 4. driving mechanism; 41. telescopic member; 42. compression spring; 43. fixing assembly; 431. ratchet; 432. pawl; 433. reset spring; 434. rotating rod; 435. rotating handle; 436. locking block; 5. carriage side wall; 6. limit block. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-4 This application is described in further detail.

[0033] Embodiment 1:

[0034] The present application embodiment discloses a ladder that can be automatically retracted and extended. Figure 1-2The automatically retractable ladder comprises a ladder body 1, a fixing rod 2, a connecting rod 3 and a driving mechanism 4. The ladder body 1 comprises two parallel vertical rods 11 and a plurality of pedal rods 12 vertically welded and fixed to the two vertical rods 11. The fixing rod 2 is bolted and fixed to the side wall 5 of the carriage in the vertical direction, and two fixing rods 2 are arranged at intervals in the horizontal direction, and the distance between the two fixing rods 2 is greater than the maximum distance between the two vertical rods 11.

[0035] Reference Figure 2 One end of the connecting rod 3 is rotatably connected to the side wall of the two fixing rods 2 on the side close to each other, and the other end of the connecting rod 3 is rotatably connected to one of the vertical rods 11. A plurality of connecting rods 3 are arranged along the length direction of the fixing rods 2, that is, the connecting rods 3 are vertically parallel and spaced apart, and the end of the connecting rod 3 on the same fixing rod 2 away from the fixing rod 2 is rotatably connected to the same vertical rod 11. The driving mechanism 4 is used to drive the connecting rod 3 to rotate.

[0036] By rotating the connecting rod 3 up and down through the driving mechanism 4, the ladder body 1 can be driven to approach or move away from the side wall 5 of the carriage in parallel. When the ladder body 1 abuts against the side wall 5 of the carriage, it is equivalent to the ladder body 1 being folded and stowed; when the ladder body 1 is farthest from the side wall 5 of the carriage, that is, when the connecting rod 3 and the fixed rod 2 are in a vertical state, the ladder body 1 is in the best use state at this time. In order to prevent the ladder body 1 from falling when it is in the best use state, a limit block 6 is welded and fixed on the side of the bottom of the connecting rod 3 close to the fixed rod 2. When the connecting rod 3 and the fixed rod 2 are in a vertical state, the side wall of the limit block 6 abuts against the side wall of the fixed rod 2, thereby limiting the downward rotation of the connecting rod 3.

[0037] The driving mechanism 4 includes a telescopic member 41. The exemplary telescopic member 41 adopts an electric telescopic rod. One end of the telescopic member 41 is rotatably connected to the side wall 5 of the carriage, and the other end of the telescopic member 41 is rotatably connected to the pedal rod 12 in the ladder body 1. Both ends of the telescopic member 41 rotate up and down in the horizontal direction, that is, the rotation plane of the telescopic member 41 is parallel to the rotation plane of the connecting rod 3. When driving the connecting rod 3 to rotate downward, it is only necessary to drive the telescopic member 41 to extend, drive the ladder body 1 away from the side wall 5 of the carriage, and drive the connecting rod 3 to rotate downward; when driving the connecting rod 3 to rotate upward, it is only necessary to drive the telescopic member 41 to shorten. The structure is simple, the degree of automation is high, and it is easy to use.

[0038] The implementation principle of the automatically retractable ladder in the embodiment of the present application is as follows: when the ladder is needed, the telescopic member 41 is driven to extend to drive the ladder body 1 away from the car side wall 5, and the connecting rod 3 is driven to rotate downward. When the connecting rod 3 is rotated to be vertical to the fixed rod 2, the side wall of the limit block 6 abuts against the side wall of the fixed rod 2, thereby limiting the connecting rod 3 from continuing to rotate downward. At this time, the ladder body 1 is in the best use state; when the ladder body 1 is used up, the telescopic member 41 is driven to shorten and drive the ladder body 1 close to the car side wall 5 until the ladder body 1 abuts against the car side wall 5. At this time, the ladder body 1 is folded and retracted, which does not affect the normal driving of the vehicle, thereby improving the inconvenience of using the ladder temporarily hung.

[0039] Embodiment 2:

[0040] The embodiment of the present application discloses an automatically retractable ladder. The difference between the embodiment 2 of the present application and the embodiment 1 of the present application is that, with reference to Figure 3-4 The driving mechanism 4 includes a compression spring 42 and a fixing assembly 43 . The connecting rod 3 is rotationally connected to the fixing rod 2 via a fixedly connected rotating shaft 31 , and the rotating shaft 31 passes through the fixing rod 2 .

[0041] One end of the compression spring 42 is fixedly connected to the limit block 6, and the other end of the compression spring 42 is fixedly connected to the side wall of the fixed rod 2. The compression spring 42 makes the connecting rod 3 tend to move away from the fixed rod 2 around the rotation axis 31. The fixing assembly 43 is arranged on the fixed rod 2, and the fixing assembly 43 is used to lock the rotation position of the connecting rod 3, and limit the downward rotation of the connecting rod 3 around the rotation axis 31.

[0042] When the ladder body 1 needs to be used, the restriction of the fixing assembly 43 on the downward rotation of the connecting rod 3 is released, so that the connecting rod 3 rotates downward around the rotating shaft 31 under the elastic force of the compression spring 42, thereby causing the ladder body 1 to open automatically. The structure is simple, and the compression spring 42 is used as the power source, which is low in cost and saves costs.

[0043] The fixing assembly 43 includes a ratchet 431, a pawl 432 and a return spring 433. The ratchet 431 is coaxially welded and fixed to one end of the rotating shaft 31. The pawl 432 is rotatably connected to the fixing rod 2 through an integrally formed rotating rod 434. One end of the return spring 433 is fixedly connected to the fixing rod 2, and the other end of the return spring 433 is fixedly connected to the peripheral wall of the pawl 432. The return spring 433 tends to make the pawl 432 engage between the ratchet teeth of the ratchet 431. The characteristics of the ratchet 431 and the pawl 432 make the upward rotation of the connecting rod 3 unrestricted, while the downward rotation of the connecting rod 3 is restricted. When in use, the pawl 432 is rotated to overcome the elastic force of the return spring 433, so that the pawl 432 is disengaged from the ratchet 431, and the locking of the connecting rod 3 can be released, and the connecting rod 3 can be rotated downward around the rotating shaft 31 under the elastic force of the compression spring 42. When the ladder body 1 needs to be rotated upward and folded for storage after use, it is only necessary to stop applying force to the pawl 432 so that the pawl 432 remains engaged with the ratchet 431 under the action of the return spring 433, which is convenient to use.

[0044] Furthermore, in order to prevent the pawl 432 from rotating abnormally due to vibration when the vehicle is running, thereby disengaging from the engagement state with the ratchet wheel 431, a locking component for locking the rotating rod 434 is provided on the rotating rod 434. The locking component includes a rotating handle 435 and a locking block 436. One end of the rotating handle 435 is rotatably connected to one end of the rotating rod 434. The locking block 436 is welded and fixed on the rotating handle 435. A slot 21 is provided on the fixed rod 2 corresponding to the locking block 436. The size of the slot 21 is interference-fitted with the outer size of the locking block 436. The rotating handle 435 is rotated so that the locking block 436 is tightly engaged in the slot 21, so that the rotation of the rotating rod 434 can be locked. The structure is simple and easy to use. In addition, in order to protect the pedal rod 12 and reduce the damage caused by long-term stepping on the pedal rod 12, a protective pad 13 is sleeved on the peripheral wall of the pedal rod 12.

[0045] The implementation principle of the automatically retractable ladder in the embodiment of the present application is as follows: when the ladder body 1 is needed, the pawl 432 is rotated to overcome the elastic force of the return spring 433, so that the pawl 432 is disengaged from the ratchet 431, thereby releasing the lock of the connecting rod 3, and the connecting rod 3 is automatically rotated downward to open under the elastic force of the compression spring 42; when the ladder body 1 is used, the ladder body 1 is rotated upward until the ladder body 1 is against the side wall 5 of the vehicle compartment, so that the ladder body 1 is folded and stored. At this time, no force is applied to the pawl 432, and the pawl 432 can be rotated to remain engaged with the ratchet 431 under the elastic force of the return spring 433, thereby limiting the downward rotation of the connecting rod 3, and at the same time, the rotating handle on the rotating rod 434 is rotated until the locking block 436 is tightly engaged in the slot 21, thereby completely locking the rotation of the pawl 432, preventing the pawl 432 from rotating abnormally due to vibration during driving of the vehicle, thereby disengaging from the engaged state with the ratchet 431.

[0046] The above are all optional embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An automatically retractable ladder, characterized in that: The invention comprises a ladder body (1), a fixed rod (2), a connecting rod (3) and a driving mechanism (4); the ladder body (1) comprises two parallel vertical rods (11) and a plurality of pedal rods (12) vertically connecting the two vertical rods (11); the fixed rod (2) is used for being fixedly mounted on a side wall (5) of a carriage in a vertical direction; two fixed rods (2) are arranged at intervals in a horizontal direction; one end of the connecting rod (3) is rotatably connected to the fixed rod (2); a plurality of connecting rods (3) are arranged in parallel in a vertical direction and at intervals; an end of the connecting rod (3) on the same fixed rod (2) away from the fixed rod (2) is rotatably connected to the same vertical rod (11); the connecting rod (3) rotates in a horizontal direction; and the driving mechanism (4) is used for driving the connecting rod (3) to rotate.

2. The automatically retractable ladder according to claim 1, characterized in that: The driving mechanism (4) comprises a telescopic member (41), one end of the telescopic member (41) is rotatably connected to the compartment side wall (5), the other end of the telescopic member (41) is rotatably connected to the ladder body (1), and the rotation plane of the telescopic member (41) is parallel to the rotation plane of the connecting rod (3).

3. The automatically retractable ladder according to claim 1, characterized in that: A limiting block (6) is provided at the bottom of the connecting rod (3) on one side close to the fixing rod (2).

4. The automatically retractable ladder according to claim 1, characterized in that: The driving mechanism (4) comprises a compression spring (42) and a fixing assembly (43); one end of the compression spring (42) is connected to the limit block (6), and the other end of the compression spring (42) is connected to the fixing rod (2); the compression spring (42) tends to open the connecting rod (3) and the fixing rod (2); and the fixing assembly (43) is used to lock the rotational position of the connecting rod (3).

5. The automatically retractable ladder according to claim 4, characterized in that: The fixing assembly (43) comprises a ratchet (431), a pawl (432) and a return spring (433); the connecting rod (3) is rotatably connected to the fixing rod (2) via a rotating shaft (31); the ratchet (431) is coaxially connected to one end of the rotating shaft (31); the pawl (432) is rotatably connected to the fixing rod (2); one end of the return spring (433) is connected to the pawl (432); the other end of the return spring (433) is connected to the fixing rod (2); the return spring (433) causes the pawl (432) to tend to be engaged between the ratchet teeth of the ratchet (431); and the pawl (432) is used to limit the connection rod (3) and the fixing rod (2) from opening.

6. The automatically retractable ladder according to claim 5, characterized in that: The ratchet pawl (432) is rotatably connected to the fixed rod (2) via an integrally formed rotating rod (434), and a locking component for locking the rotating rod (434) is provided on the rotating rod (434).

7. The automatically retractable ladder according to claim 6, characterized in that: The locking component comprises a rotating handle (435) and a locking block (436); one end of the rotating handle (435) is rotatably connected to the rotating rod (434); the locking block (436) is arranged on the rotating handle (435); a slot (21) is provided on the fixed rod (2) corresponding to the locking block (436); and the locking block (436) can be rotated to be tightly engaged in the slot (21).

8. The automatically retractable ladder according to claim 1, characterized in that: A protective pad (13) is sleeved on the peripheral wall of the pedal rod (12).

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