CN213928210U - Extension ladder - Google Patents

Abstract

The utility model provides a draw ladder, including a plurality of sliding connection's ladder frame in proper order and set up two bracing pieces on the ladder frame of lower floor, two bracing pieces rotationally are connected with the ladder frame of lower floor, and rotate the axis between the ladder frame of bracing piece and lower floor and include along the first axis that ladder frame width direction extends and with first axis looks vertically second axis. So set up, rotate the bracing piece in order to strut the bracing piece around first axis, rotate two bracing pieces around first axis when suitable angle, make two bracing pieces expand around the direction of respective second axis ladder frame both sides respectively again, two bracing pieces can play the effect of bracing piece ladder frame like this, prevent that ladder frame from sliding in the use, and the bracing piece can expand around the both sides direction of second axis ladder frame, make the bracing piece far away from ladder frame with the contact point on ground, thereby can prevent that ladder frame from empting.

Description

Extension ladder

Technical Field

The utility model relates to a ladder technical field, more specifically say, relate to an extension ladder.

Background

The extension ladder is usually made of high-strength high-quality aluminum alloy materials and can be used for climbing for rescuing people and extinguishing fire during fire fighting and disaster relief; particularly, no climbing vehicle exists in cities, a fire fighting channel is narrow, the climbing vehicle cannot reach a fire scene, and a common ladder cannot reach the required height on the scene, and the ladder can be matched with fire fighting and disaster relief; and can also be used for ascending maintenance and various ascending operations of factories, mines, multi-storey buildings and the like. However, when the existing extension ladder in the current market is used, the contact area between the extension ladder and the ground is small, so that the extension ladder is easy to slide, and safety accidents are caused. Therefore, how to solve the problem that the contact area between the extension ladder and the ground is small and the sliding is easy to occur to cause safety accidents in the prior art is a technical problem that needs to be solved urgently by the technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a can stable support can not produce gliding ladder that draws.

In order to solve the problem, the utility model provides a draw ladder, including a plurality of sliding connection's ladder frame in proper order with set up in the lower floor two bracing pieces on the ladder frame, two the bracing piece with the lower floor the ladder frame is rotationally connected, just bracing piece and lower floor it includes the edge to rotate the axis between the ladder frame the first axis that ladder frame width direction extends and with first axis looks vertically second axis.

Preferably, one rung of the lowermost ladder frame is rotatably arranged, the rotatable rung is provided with a rotating shaft which is perpendicular to the axial direction of the rung, and the support rod is provided with a mounting hole which is rotatably matched with the rotating shaft.

Preferably, one of the two connected ladder frames is provided with a guide groove extending along the length direction of the ladder frame, the other ladder frame is provided with a guide block slidably arranged in the guide groove, and a plurality of rollers distributed along the length direction of the guide groove and used for supporting the guide block are arranged in the guide groove; or one of the two connected ladder frames is provided with a guide groove extending along the length direction of the ladder frame, and the other ladder frame is provided with a roller capable of rolling in the guide groove.

Preferably, two sides of the two connected ladder frames are respectively provided with a transverse limiting mechanism for preventing the two ladder frames from transversely moving, and the transverse limiting mechanism comprises a fixed plate arranged on one of the two connected ladder frames and a rotating wheel which is rotatably arranged on the fixed plate and is abutted against the outer side of the other of the two connected ladder frames.

Preferably, the ladder frame is provided with a long groove for guiding the runner.

Preferably, the number of the ladder frames is three, the second ladder frame is provided with a ladder step lock for locking and unlocking the first and second ladder frames, and the third ladder frame is provided with a ladder step lock for locking and unlocking the second and third ladder frames.

Preferably, the first rope pulling mechanism is used for driving a second ladder frame to slide relative to a first ladder frame, and the first rope pulling mechanism comprises a first rope, a fixed pulley and a first movable pulley, wherein the fixed pulley and the first movable pulley are rotatably arranged on the first ladder frame, the first movable pulley is rotatably arranged on the step locks of the second ladder frame, the first end of the first rope sequentially passes around the fixed pulley, the first movable pulley is connected with the first ladder frame, the number of the step locks on the second ladder frame is two, the two step locks are distributed on two sides of the second ladder frame, the number of the first rope pulling mechanisms is also two, and the first rope pulling mechanisms correspond to the step locks on the second ladder frame one by one.

Preferably, the ladder comprises a first stay rope mechanism for driving a first ladder frame to slide relative to a second ladder frame, the first stay rope mechanism comprises a first stay rope and a first movable pulley rotatably arranged on the first ladder frame, a first end of the first stay rope is connected with the first ladder frame, the other end of the first stay rope is connected with a first step lock on the first ladder frame by bypassing the first movable pulley, the number of the step locks on the first ladder frame is two, the two step locks are distributed on two sides of the first ladder frame, and the first stay rope mechanism is in one-to-one correspondence with the step locks on the first ladder frame.

Preferably, the ladder rung lock comprises a main body rotatably connected with a first one of the two adjacent ladder frames and a tongue rotatably connected with the main body, the main body is provided with a groove, one ladder rung of the first one of the two adjacent ladder frames is arranged in the groove, the notch of the groove faces to a second one of the two adjacent ladder frames, the groove wall of the groove is used for clamping with the ladder rung of the second one, and the tongue is used for closing and opening the groove.

Preferably, the pedal lock comprises a bracket, a pressing plate rotationally connected with the bracket, a stop lever rotationally connected with the bracket, a fixed column arranged on the bracket and used for abutting against a first end of the stop lever to limit the rotation angle of the stop lever, and an elastic element used for driving a second end of the stop lever to rotate in a direction away from the bracket; the support is arranged on a first one of the two adjacent ladder frames, the second end of the stop lever is used for being clamped with a ladder step of a second one of the two adjacent ladder frames, and the stop lever is pressed down towards the direction close to the support by the pressing plate.

The utility model provides an among the technical scheme, a draw ladder, including a plurality of sliding connection's ladder frame in proper order and set up two bracing pieces on the ladder frame of lower floor, two bracing pieces are rotationally connected with the ladder frame of lower floor, and rotate the axis between the ladder frame of bracing piece and lower floor and include along the first axis that ladder frame width direction extends and with first axis looks vertically second axis. So set up, rotate the bracing piece in order to strut the bracing piece around first axis, rotate two bracing pieces around first axis when suitable angle, make two bracing pieces expand around the direction of respective second axis ladder frame both sides respectively again, two bracing pieces can play the effect of bracing piece ladder frame like this, prevent that ladder frame from sliding in the use, and the bracing piece can expand around the both sides direction of second axis ladder frame, make the bracing piece far away from ladder frame with the contact point on ground, thereby can prevent that ladder frame from empting.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a pull ladder according to some embodiments of the present invention;

fig. 2 is a schematic structural view of a support rod according to some embodiments of the present invention;

fig. 3 is a left side view of the ladder of fig. 2;

fig. 4 is a schematic diagram of a first cord mechanism according to some embodiments of the present invention;

FIG. 5 is a top view of the first cord mechanism of FIG. 4;

fig. 6 is a schematic diagram of a second cord mechanism according to some embodiments of the present invention;

fig. 7 is a schematic structural view of a ladder step lock according to some embodiments of the present invention;

fig. 8 is a schematic structural view of a ladder step lock according to some embodiments of the present invention;

fig. 9 is a schematic view showing a use state of the rung lock in fig. 7;

fig. 10 is a schematic view showing a state in which the rung lock of fig. 8 is used.

Reference numerals:

1. a ladder frame; 2. a support bar; 3. a rotating shaft; 4. a guide groove; 5. a roller; 6. a fixing plate; 7. a rotating wheel; 8. a first pull cord; 9. a fixed pulley; 10. a first movable pulley; 11. a ladder step lock; 12. a second pull cord; 13. a second movable pulley; 14. a main body; 15. a tongue piece; 16. a groove; 17. a support; 18. pressing a plate; 19. a stop lever; 20. fixing a column; 21. an elastic member; 22. ladder treadling; 23. a guide pulley.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the scope of the invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims.

Referring to fig. 1 to 10, an embodiment of the present invention provides a ladder, which includes a plurality of ladder frames 1 connected in a sliding manner in sequence and two support rods 2 disposed on the ladder frame 1 at the lowest layer. The two support rods 2 are rotatably connected with the lowermost ladder frame 1, and the rotation axis between the support rods 2 and the lowermost ladder frame 1 comprises a first axis extending along the width direction of the ladder frame 1 and a second axis perpendicular to the first axis. The lowermost ladder frame 1 is the rightmost ladder frame 1 in fig. 1, and the lowermost ladder frame 1 is the ladder frame 1 supported on the ground in actual use. Alternatively, as shown in fig. 1, the end of the lowermost ladder frame 1 for contacting the ground and the end of the support bar 2 for contacting the ground are respectively provided with a tapered portion to increase the anti-slip effect of the extension ladder.

Referring to fig. 1-3, so set up, rotate bracing piece 2 around first axis in order to strut bracing piece 2, rotate two bracing pieces 2 around first axis to when suitable angle, make two bracing pieces 2 expand around the direction of respective second axis to ladder frame 1 both sides respectively again, two bracing pieces 2 can play the effect of bracing piece 2 ladder frame 1 like this, prevent that ladder frame 1 from sliding in the use, and bracing piece 2 can expand around the both sides direction of second axis ladder frame 1, make the contact point distance ladder frame 1 on bracing piece 2 and ground far away, thereby can prevent ladder frame 1 from empting more effectively.

In some embodiments, one rung 22 of the lowermost ladder frame 1 is rotatably arranged, and as shown in fig. 2, the rung 22 may be rotatably connected to the ladder frame 1 by bearings at both ends. Referring to fig. 3, the rotatable rung 22 is provided with a shaft 3 perpendicular to its own axial direction, and the support rod 2 is provided with a mounting hole for rotatably engaging with the shaft 3, through which the support rod 2 is rotatably engaged with the shaft 3 of the rung 22. That is, the rotation axis of the rotatable rung 22 constitutes the first axis, and the axis of the shaft 3 constitutes the second axis. So set up, bracing piece 2 and ladder frame 1's connection structure is simple compact to convenient to use.

Referring to fig. 1, in some embodiments, one of the two ladder frames 1 is provided with a guide slot 4 extending along the length direction thereof, the other is provided with a guide block slidably disposed in the guide slot 4, and a plurality of rollers 5 distributed along the length direction of the guide slot 4 for supporting the guide block are disposed in the guide slot 4. By providing rollers 5 in the guide grooves 4, the resistance is less when the guide blocks slide in the guide grooves 4. Naturally, the matching manner of the two connected ladder frames 1 is not limited to the above manner, and for example, one of the two connected ladder frames 1 may be provided with a guide groove 4 extending along the length direction thereof, and the other may be provided with a roller 5 capable of rolling in the guide groove 4, and the roller 5 may directly slide in the guide groove 4 to reduce the resistance.

Referring to fig. 1, in some embodiments, two sides of two connected ladder frames 1 are respectively provided with a transverse limiting mechanism for preventing the two ladder frames from transversely moving. The transverse limiting mechanism comprises a fixing plate 6 arranged on one of the two connected ladder frames 1 and a rotating wheel 7 which is rotatably arranged on the fixing plate 6 and is propped against the outer side of the other of the two connected ladder frames 1. So set up, because two horizontal stop gear's of both sides existence for horizontal dislocation can not appear in two ladder frame 1 relative slip in-process and the use, has guaranteed to draw the stability of ladder structure, has improved the safety in utilization who draws the ladder. Taking the rightmost ladder frame 1 and the middle ladder frame 1 in fig. 1 as an example, the upper end of the rightmost ladder frame 1 is provided with a transverse limiting mechanism, and certainly, one side of the upper end of the rightmost ladder frame 1 facing the paper surface is also provided with a transverse limiting mechanism; the lower end of the middle ladder frame 1 is provided with a transverse limiting mechanism, and one side of the lower end of the middle ladder frame 1 facing the paper surface is also provided with the transverse limiting mechanism, so that the horizontal dislocation between the rightmost ladder frame 1 and the middle ladder frame 1 can be effectively limited. During the in-service use, can set up horizontal stop gear's quantity as required. In some embodiments, the ladder frame 1 is provided with a long slot for guiding the runner 7, the long slot extending along the length direction of the ladder frame 1.

In some embodiments, the number of ladder frames 1 is three. Referring to fig. 1, three ladder frames 1 are a first ladder frame 1, a second ladder frame 1 and a third ladder frame 1 in sequence from right to left. The second ladder frame 1 is provided with a ladder lock 11 for locking and unlocking the first and second ladder frames 1, and the third ladder frame 1 is provided with a ladder lock 11 for locking and unlocking the second and third ladder frames 1. Taking the first ladder frame 1 and the second ladder frame 1 as an example, when the second ladder frame 1 is lifted to a proper position, the first ladder frame 1 and the second ladder frame 1 can be locked by the ladder lock 11 to prevent the first ladder frame 1 and the second ladder frame 1 from moving relatively, and after the use is finished, the ladder lock 11 is enabled to unlock the first ladder frame 1 and the second ladder frame 1, so that the second ladder frame 1 can be retracted.

Referring to fig. 4-5, in some embodiments, the ladder further comprises a first pull-cord mechanism for driving the second ladder frame 1 to slide relative to the first ladder frame 1. The first rope pulling mechanism comprises a first rope 8, a fixed pulley 9 and a first movable pulley 10 which are rotatably arranged on the first ladder frame 1. Referring to fig. 4, the first movable sheave 10 is rotatably provided on the step lock 11 of the second ladder frame 1. The first end of the first pull rope 8 is connected with the first ladder frame 1 by sequentially passing around the fixed pulley 9 and the first movable pulley 10. When the second end of the first pull rope 8 is pulled, the first movable pulley 10 rises, and the second ladder frame 1 rises under the drive of the first movable pulley 10. The number of the ladder lock 11 on the second ladder frame 1 is two, the two ladder locks 11 are distributed on two sides of the second ladder frame 1, and the number of the first rope pulling mechanisms is also two and is in one-to-one correspondence with the ladder locks 11 on the second ladder frame 1. The second ladder frame 1 can be more stably lifted on the one hand by arranging two sets of first rope pulling mechanisms, and on the other hand, the ladder step locks 11 are arranged on two sides of the ladder frame 1, and the first rope pulling mechanisms are connected with the ladder step locks 11 and are basically distributed on two sides of the ladder frame 1, so that when a user climbs a ladder, the first rope pulling mechanisms cannot obstruct the user from climbing. Referring to fig. 5, on one hand, in order to facilitate the folding together of the second ends of the two first pulling ropes 8, a user can pull the two second pulling ropes simultaneously; on the other hand, in order to enable the two first rope pulling mechanisms to further approach to the two sides of the ladder frame respectively, the user can climb conveniently. Optionally, two guide pulleys 23 are disposed between the two fixed pulleys 9, the two guide pulleys 23 correspond to the two first pull ropes 8 one by one, and the second ends of the two first pull ropes 8 are substantially folded together after passing around the corresponding guide pulleys 23, so that a user can pull the two first pull ropes simultaneously.

Referring to fig. 6, in some embodiments, the ladder further comprises a second rope pulling mechanism for driving the third ladder frame 1 to slide relative to the second ladder frame 1. The second rope pulling mechanism comprises a second rope 12 and a second movable pulley 13 which is rotatably arranged on the second ladder frame 1. The first end of the second pull rope 12 is connected with the first ladder frame 1, and the other end is connected with the step lock 11 on the third ladder frame 1 by passing through the second movable pulley 13. When the second ladder frame 1 is lifted, the third ladder frame 1 can be driven to lift by the second rope 12 and the second movable pulley 13. The number of the ladder lock 11 on the first ladder frame 1 is two, and the two ladder locks 11 are distributed on both sides of the first ladder frame 1, and the number of the second rope pulling mechanisms is two, and is in one-to-one correspondence with the ladder locks 11 on the first ladder frame 1. Its advantage is similar to first stay cord mechanism, no longer redundantly describes. In order to facilitate the pulley to adapt to the stay cord better, the support frame of the pulley in this embodiment can be connected with the ladder frame rotation, and the pulley is universal pulley promptly.

Referring to fig. 7 and 9, in some embodiments, the rung lock 11 includes a main body 14 rotatably connected to a first one of the two adjacent ladders 1 and a tongue 15 rotatably connected to the main body 14. Referring to fig. 9, the right end of the main body 14 may be pivotally connected to the ladder frame 1. The main body 14 is provided with a groove 16, and one rung 22 of a first one of the two adjacent ladder frames 1 is placed in the groove 16. The notch 16 is notched towards the second of the two adjacent ladders 1 and the walls of the notch 16 are adapted to engage with the rungs 22 on the second. The tongue 15 is used to close and open the groove 16. Referring to fig. 9, when the ladder rack 1 on the upper layer ascends, the right side of the groove 16 of the main body 14 abuts against the step 22 of the ladder rack 1 on the lower layer, but because the main body 14 is in running fit with the ladder rack 1 on the upper layer, the left end of the main body 14 rotates upwards, when the ladder rack 1 on the upper layer is in place, the step 22 of the ladder rack 1 on the lower layer is positioned in the groove 16, at this time, the inner groove wall of the groove 16 is clamped with the step 22 of the ladder rack 1 on the lower layer, the ladder rack 1 on the upper layer cannot slide downwards, i.e. cannot slide to the right side in fig. 9, and the ladder rack 1 on the two layers is locked and can be climbed by a user. When the two-layer ladder frame 1 needs to be unlocked, the upper-layer ladder frame 1 only needs to be continuously pulled upwards, namely the upper-layer ladder frame 1 is pulled towards the right side in fig. 9, so that the rungs 22 of the lower-layer ladder frame 1 move to the left side of the tongue piece 15, then the upper-layer ladder frame 1 can move downwards, namely the upper-layer ladder frame 1 moves towards the left side in fig. 9 to the initial position, in the process, the rungs 22 of the lower-layer ladder frame 1 push the tongue piece 15 to close the groove 16, and therefore the rungs 22 of the lower-layer ladder frame 1 cannot be clamped with the groove 16.

Referring to fig. 8 and 10, in some embodiments, the pedal lock 11 includes a bracket 17, a pressing plate 18 rotatably connected to the bracket 17, a stop lever 19 rotatably connected to the bracket 17, a fixing post 20 disposed on the bracket 17 for abutting against a first end of the stop lever 19 to limit a rotation angle of the stop lever 19, and an elastic member 21 for driving a second end of the stop lever 19 to rotate away from the bracket 17. The bracket 17 is arranged on a first one of the two adjacent ladder frames 1, and the second end of the stop lever 19 is used for being clamped with the step 22 of a second one of the two adjacent ladder frames 1. The pressing plate 18 presses the stopper rod 19 in a direction approaching the bracket 17. Referring to fig. 10, when the upper ladder frame 1 moves upwards, i.e. to the right in fig. 10, the rung 22 of the lower ladder frame 1 pushes the stop bar 19 from the right side of the stop bar 19, the stop bar 19 cannot be engaged with the rung 22 of the lower ladder frame 1, and when the rung 22 of the lower ladder frame 1 is located between the stop bar 19 and the pressing plate 18, the stop bar 19 is engaged with the rung 22 of the lower ladder frame 1, and the upper ladder frame 1 cannot slide downwards, i.e. to the left in fig. 10, the ladder frames 1 on both sides are locked, so that a user can climb. When the ladder frames 1 on two sides need to be unlocked, the upper ladder frame 1 only needs to be continuously pulled upwards, namely the upper ladder frame 1 is pulled towards the right side in fig. 10, the step 22 of the lower ladder frame 1 moves to the left side of the pressing plate 18, then the upper ladder frame 1 can move downwards, namely the upper ladder frame 1 moves towards the left side in fig. 10 to the initial position, in the process, the step 22 of the lower ladder frame 1 pushes the pressing plate 18 to press the stop lever 19 downwards, and therefore the step 22 of the lower ladder frame 1 cannot be clamped with the stop plate. Alternatively, the elastic member 21 may be a torsion spring.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides a draw ladder, its characterized in that includes a plurality of sliding connection's ladder frame (1) in proper order and sets up in the lower floor two bracing piece (2), two on ladder frame (1) bracing piece (2) and the lower floor ladder frame (1) rotationally is connected, just bracing piece (2) and lower floor the axis of rotation includes the edge between ladder frame (1) first axis that ladder frame (1) width direction extends and with first axis looks vertically second axis.

2. The ladder according to claim 1, characterized in that one rung (22) of the lowermost ladder frame (1) is rotatably arranged, and the rotatable rung (22) is provided with a shaft (3) perpendicular to its own axial direction, and the support bar (2) is provided with a mounting hole for rotatably engaging with the shaft (3).

3. A ladder as claimed in claim 1, characterized in that one of the two ladder frames (1) connected is provided with a guide slot (4) extending in the length direction thereof, and the other is provided with a guide block slidably arranged in the guide slot (4), and a plurality of rollers (5) distributed in the length direction of the guide slot (4) for supporting the guide block are arranged in the guide slot (4); or one of the two connected ladder frames (1) is provided with a guide groove (4) extending along the length direction of the ladder frame, and the other ladder frame is provided with a roller (5) capable of rolling in the guide groove (4).

4. A ladder as claimed in claim 1, characterized in that two sides of two connected ladder frames (1) are respectively provided with a lateral stop mechanism for preventing lateral dislocation of the two, the lateral stop mechanism comprising a fixed plate (6) arranged on one of the two connected ladder frames (1) and a runner (7) rotatably arranged on the fixed plate (6) and abutting against the outside of the other of the two connected ladder frames (1).

5. Ladder as claimed in claim 4, characterized in that the ladder frame (1) is provided with elongated slots for guiding the wheels (7).

6. The ladder according to claim 1, characterized in that the number of said ladder frames (1) is three, a second one of said ladder frames (1) is provided with a rung lock (11) for locking and unlocking the first and second ladder frames (1), and a third one of said ladder frames (1) is provided with a rung lock (11) for locking and unlocking the second and third ladder frames (1).

7. The ladder according to claim 6, further comprising a first rope pulling mechanism for driving the second ladder frame (1) to slide relative to the first ladder frame (1), wherein the first rope pulling mechanism comprises a first rope (8), a fixed pulley (9) rotatably disposed on the first ladder frame (1) and a first movable pulley (10), the first movable pulley (10) is rotatably disposed on the step lock (11) of the second ladder frame (1), the first rope (8) sequentially passes the fixed pulley (9) at a first end, the first movable pulley (10) is connected with the first ladder frame (1), the step locks (11) on the second ladder frame (1) are two in number, the two step locks (11) are distributed on two sides of the second ladder frame (1), and the first rope pulling mechanism is also two in number, and corresponds to the step locks (11) on the second ladder frame (1) one by one.

8. The extension ladder according to claim 6, further comprising a second rope pulling mechanism for driving a third ladder frame (1) to slide relative to a second ladder frame (1), the second rope pulling mechanism comprises a second rope (12) and a second movable pulley (13) which is rotatably arranged on the second ladder frame (1), the first end of the second pull rope (12) is connected with the first ladder frame (1), the other end of the second pull rope bypasses the second movable pulley (13) to be connected with the pedal locks (11) on the third ladder frame (1), the number of the pedal locks (11) on the first ladder frame (1) is two, the two ladder step locks (11) are distributed on two sides of the first ladder frame (1), the number of the second rope pulling mechanisms is two, and corresponds to the ladder step locks (11) on the first ladder frame (1) one by one.

9. Ladder according to claim 6, characterized in that the rung locks (11) comprise a body (14) pivotally connected to a first of two adjacent ladder frames (1) and a tongue (15) pivotally connected to the body (14), the body (14) being provided with a groove (16), one rung (22) of a first of two adjacent ladder frames (1) being placed in the groove (16), the groove (16) being notched towards a second of the two adjacent ladder frames (1), and the groove wall of the groove (16) being adapted to engage with a rung (22) of the second, the tongue (15) being adapted to close and open the groove (16).

10. The ladder according to claim 6, wherein the ladder step lock (11) comprises a bracket (17), a pressing plate (18) rotatably connected with the bracket (17), a stop lever (19) rotatably connected with the bracket (17), a fixing post (20) arranged on the bracket (17) and used for abutting against a first end of the stop lever (19) to limit the rotation angle of the stop lever (19), and an elastic member (21) used for driving a second end of the stop lever (19) to rotate away from the bracket (17); the support (17) is arranged on a first one of the two adjacent ladder frames (1), the second end of the stop lever (19) is used for being clamped with a ladder step (22) of the second one of the two adjacent ladder frames (1), and the stop lever (19) is pressed down towards the direction close to the support (17) by the pressing plate (18).

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