Folding ladder

Abstract

The utility model discloses a folding ladder, which relates to the field of folding ladders and comprises a first ladder assembly, a second ladder assembly and two sets of locking devices, and the first ladder assembly and the second ladder assembly can be locked at different angles by operating the locking devices so as to meet different use environments. The folding ladder is subjected to multiple fixation through the locking device and the safety catch, so that abrasion or deformation of the folding ladder in the using process is reduced, and the effects of prolonging the service life of the folding ladder and guaranteeing the safety of a user are achieved.

Description

TECHNICAL FIELD

[0001] The utility model discloses a folding ladder relates to the field of folding ladder. BACKGROUND

[0002] In daily life and engineering construction, the ladder is an essential tool, among them, the folding ladder is a kind of class that is more widely used in the ladder, the folding ladder can be used without other support, convenient to use, convenient to carry, but because folding ladder needs to be folded and unfolded frequently, joint part is easy to wear or deform after long time, stability is poor, becomes not firm, brings the security risk to the user. INNOVATION CONTENT

[0003] The utility model mainly solves the technical problem to provide a kind of folding ladder, the folding ladder is connected with each other by locking device to first ladder frame and second ladder frame, then through multiple fixing structure and safety device, make folding ladder more stable and safe when using, to reduce the wear or deformation of folding ladder in the process of use, reach the effect of increasing the service life of folding ladder and guaranteeing user safety.

[0004] To achieve the above object, the utility model provides the following technical scheme: its characterized in be: this folding ladder includes first ladder frame, second ladder frame and locking device, wherein first ladder frame includes: first ① ladder column, second ② ladder column and step, the step is installed on first ① ladder column and second ② ladder column, makes first ① ladder column and second ② ladder column connect together, and constitute first ladder frame, second ladder frame includes: third ③ ladder column, fourth ④ ladder column and step, wherein, the step is installed on third ③ ladder column and fourth ④ ladder column, makes third ③ ladder column and fourth ④ ladder column connect together, and constitute second ladder frame, locking device includes: first connecting plate, second connecting plate, connecting shaft hole, lock eye, safety catch hole, elastic connecting shaft, knob, lock catch, fixed claw and fixed clamping plate, wherein first connecting plate is single piece, and first connecting plate is equipped with connecting shaft hole and lock eye, and second connecting plate is two pieces, and second connecting plate is equipped with connecting shaft hole, lock eye and safety catch hole, and two second connecting plates add first connecting plate in the middle, and the connecting shaft hole on first connecting plate and second connecting plate coincides with each other, and elastic connecting shaft passes through connecting shaft hole and connects first connecting plate and second connecting plate together, and is welded and fixed on second connecting plate, and knob is installed at one end of elastic connecting shaft through thread, and lock catch is equipped with fixed claw, and lock catch is installed at the other end of elastic connecting shaft through welding, and the fixed claw on lock catch is buckled into the corresponding lock eye in first connecting plate and second connecting plate, wherein the first connecting plate in two sets of locking devices is clamped in the middle by two fixed clamping plates, is inserted into first ① ladder column, third ③ ladder column, and is connected and fixed by nut, and the second connecting plate is clamped in the middle by three fixed clamping plates respectively, is inserted into second ② ladder column, fourth ④ ladder column, and is connected and fixed by nut.Fixed clamping plate is plastic wear-resistant material, and plastic material has good elasticity, can reduce the rigid friction of the connecting place of first connecting plate and first ① ladder column, third ③ ladder column and the connecting place of second connecting plate and second ② ladder column, fourth ④ ladder column, avoids the deformation of the connecting place between connecting plate and ladder column in the long-term use process, increases the safety of user when using, and two sets of locking devices connect first ① ladder column, fourth ④ ladder column together and second ② ladder column, third ③ ladder column together through the fixed mode of nut, make first ladder frame and second ladder frame connect together, wherein the knob of two sets of locking devices is on the outside, and the lock catch is installed on first ladder frame and second ladder frame in the corresponding inside.

[0005] The first connecting plate has 7 lock eyes and the second connecting plate has 3 lock eyes, when the folding ladder is completely folded, the 3 lock eyes on the second connecting plate and 3 lock eyes on the first connecting plate coincide, the three fixed claws of the lock catch are inserted into the 3 coinciding lock eyes, when the second connecting plate rotates around the elastic connecting shaft of the locking device, the 3 lock eyes on the second connecting plate coincide with 3 lock eyes on the first connecting plate when the second connecting plate is at 0 degree angle, 60 degree angle and 180 degree angle with the first ladder frame and the second ladder frame, the fixed claws are inserted into the coinciding lock eyes, the locking device is locked, the triangular structure has strong stability, can increase the stability of the folding ladder when using, and can also increase the service life of the folding ladder.

[0006] The three fixing claws on the lock catch can be inserted into three keyholes respectively, so that the first connecting plate and the second connecting plate can be fixed at corresponding angles.

[0007] The elastic connecting shaft is a dustproof shaft, which can prevent dust or foreign matters from entering the elastic connecting shaft when the folding ladder is used, so that the elastic connecting shaft loses elasticity and cannot work, the use risk is increased, and the service life of the folding ladder is reduced.

[0008] The second connecting plate is provided with a safety catch hole, a safety catch made of metal can be inserted into the safety catch hole, when the first ladder frame and the second ladder frame are 180 degrees, the safety catch made of metal can block the first connecting plate, so that the stress point when the first ladder frame and the second ladder frame are 180 degrees is further increased, the folding ladder is safer and more stable when used, the wear of the folding ladder is reduced, and the service life of the folding ladder is increased.

[0009] The safety catch can be made of materials available on site, such as a screwdriver commonly used in construction or a relatively hard stick-shaped object, which can also have the corresponding safety effect.

[0010] In the embodiment, the pedal is installed between the first ① ladder column and the second ② ladder column to connect the first ① ladder column and the second ② ladder column together to form a first ladder frame, the pedal is installed between the third ③ ladder column and the fourth ④ ladder column to connect the third ③ ladder column and the fourth ④ ladder column together to form a second ladder frame, the first connecting plate is inserted between the two second connecting plates, the connecting shaft holes on the first connecting plate and the second connecting plate are overlapped, the elastic connecting shaft with the lock catch is inserted into the connecting shaft hole, the three fixing claws on the lock catch are inserted into the overlapping lock holes on the first connecting plate and the second connecting plate, then the outer wall of the elastic connecting shaft is welded and fixed with the second connecting plate, the lock catch is welded at one end of the elastic connecting shaft, the knob is screwed at the other end of the elastic connecting shaft, when the knob is pressed to press the elastic connecting shaft, the fixing claws of the lock catch are pulled out of the overlapping lock holes on the first connecting plate and the second connecting plate, when the knob is released, the elastic connecting shaft rebounds, the fixing claws of the lock catch are inserted into the overlapping lock holes on the first connecting plate and the second connecting plate again, two sets of assembled locking devices are taken, the first connecting plate and the fixed clamping plate of the locking device are inserted into the first ① ladder column and the third ③ ladder column and are fixed by nuts, the second connecting plate and the fixed clamping plate of the locking device are inserted into the second ② ladder column and the fourth ④ ladder column and are fixed by nuts, the first ladder frame and the second ladder frame are connected together, the knobs of the two sets of locking devices are on the outside, the lock catches are on the inside and are correspondingly installed on the first ladder frame and the second ladder frame, when the folding ladder is not used, the first ladder frame and the second ladder frame are folded together and are parallel, which is convenient for carrying and storing, when the folding ladder is used in the working environment of the ladder, the knobs of the two sets of locking devices are pressed at the same time, the three fixing claws of the lock catch are pulled out of the lock hole, the first ladder frame or the second ladder frame is rotated, when the first ladder frame and the second ladder frame form a 60-degree angle, the three lock holes on the first connecting plate and the second connecting plate are overlapped and are opposite to the three fixing claws of the lock catch, the three fixing claws of the lock catch are inserted into the corresponding lock holes under the elastic force of the elastic connecting shaft, the folding ladder is locked and fixed, when the folding ladder is used in the working environment of the straight ladder, the knobs of the two sets of locking devices are pressed at the same time, the three fixing claws of the lock catch are pulled out of the lock hole, the first ladder frame or the second ladder frame is rotated, when the first ladder frame and the second ladder frame form a 180-degree angle, the three lock holes on the first connecting plate and the second connecting plate are overlapped and are opposite to the three fixing claws of the lock catch, the three fixing claws of the lock catch are inserted into the corresponding lock holes again under the elastic force of the elastic connecting shaft, the folding ladder is locked and fixed, at the same time, the safety catch made of metal is inserted into the safety catch hole to block the first connecting plate on the first ① ladder column and the third ③ ladder column, so that the folding ladder in the straight ladder state is more stable.

[0011] The beneficial effects of the above technical scheme are:

[0012] 1. The design of the three-claw lock catch increases the stability of the folding ladder and reduces the wear of the folding ladder in use.

[0013] 2. The fixed clamping plate is made of plastic material, which reduces the rigid friction between the first ladder frame and the second ladder frame and the locking device, and increases the service life of the folding ladder;

[0014] 3. The first ladder frame, the second ladder frame and the locking device are connected in the form of nut connection, which facilitates the maintenance and replacement of folding ladder accessories, and reduces the use cost of the folding ladder; BRIEF DESCRIPTION OF DRAWINGS

[0015] The specific embodiments of the utility model will be further described in detail below with reference to the drawings.

[0016] ATTACHMENT Figure 1 It is a perspective structural schematic view of the folding ladder of the utility model when it is opened.

[0017] ATTACHMENT Figure 2 It is a perspective structural schematic view of the locking catch of the folding ladder of the utility model.

[0018] ATTACHMENT Figure 3 It is a structural schematic view of the locking catch section of the folding ladder of the utility model.

[0019] ATTACHMENT Figure 4 It is a structural schematic view of the locking catch section of the folding ladder of the utility model.

[0020] ATTACHMENT Figure 5 It is a structural schematic view of the locking catch section of the folding ladder of the utility model.

[0021] Wherein 1, the first ladder frame, 2, the second ladder frame, 3, the pedal, 4, the locking device, 11, the first ladder column, 12, the second ladder column, 21, the third ladder column, 22, the fourth ladder column, 41, the first connecting plate, 42, the second connecting plate, 421, the safety bolt hole, 43, the connecting shaft hole, 44, the keyhole, 45, the elastic connecting shaft, 46, the knob, 47, the locking catch, 471, the fixed claw, 48, the fixed clamping plate. DETAILED DESCRIPTION

[0022] The preferred embodiment of the folding ladder of the utility model will be described in detail below with reference to the drawings.

[0023] ATTACHMENT Figures 1-5The utility model discloses a folding ladder's specific embodiment has the following characteristics: the folding ladder includes first ladder frame 1, second ladder frame 2 and locking device 4, wherein first ladder frame 1 includes: the first ① ladder column 11, the second ② ladder column 12 and the step 3, the step 3 is installed on the first ① ladder column 11 and the second ② ladder column 12, make the first ① ladder column 11 and the second ② ladder column 12 connect together, constitute first ladder frame 1, second ladder frame 2 includes: the first ③ ladder column 21, the second ④ ladder column 22 and the step 3, wherein, the step 3 is installed on the first ③ ladder column 21 and the second ④ ladder column 22, make the first ③ ladder column 21 and the second ④ ladder column 22 connect together, constitute second ladder frame 2, locking device 4 includes: the first connecting plate 41, the second connecting plate 42, the connecting shaft hole 43, the lock eye 44, the safety bolt hole 421, the elastic connecting shaft 45, the knob 46, the lock catch 47, the fixed claw 471 and the fixed clamping plate 48, wherein the first connecting plate 41 is single piece, and the first connecting plate 41 is equipped with the connecting shaft hole 43 and the lock eye 44, and the second connecting plate 42 is two pieces, and the second connecting plate 42 is equipped with the connecting shaft hole 43, the lock eye 44 and the safety bolt hole 421, and two pieces of the second connecting plate 42 are added in the middle of the first connecting plate 41, and the connecting shaft hole 43 on the first connecting plate 41 and the second connecting plate 42 coincide with each other, and the elastic connecting shaft 45 passes through the connecting shaft hole 43 and connects the first connecting plate 41 and the second connecting plate 42 together, and is welded and fixed on the second connecting plate 42, and the knob 46 is installed at one end of the elastic connecting shaft 45 through the thread, and the lock catch 47 is equipped with the fixed claw 471, and the lock catch 47 is installed at the other end of the elastic connecting shaft 45 through the welding mode, and the fixed claw 471 on the lock catch 47 is buckled into the corresponding lock eye 44 on the first connecting plate 41 and the second connecting plate 42, wherein the first connecting plate 41 in two sets of locking device 4 is clamped in the middle by two fixed clamping plates 48, is inserted into the first ① ladder column 11, the first ③ ladder column 21, and is fixed by the nut, and the second connecting plate 42 is clamped in the middle by three fixed clamping plates 48 respectively, is inserted into the second ② ladder column 12, the second ④ ladder column 22, and is fixed by the nut, and two sets of locking device 4 are connected together by the nut fixed mode respectively the first ① ladder column 11, the second ④ ladder column 22 and the second ② ladder column 12, the first ③ ladder column 21 make first ladder frame 1 and second ladder frame 2 connect together, wherein the knob 46 of two sets of locking device 4 is on the outside, and the lock catch 47 is installed on the first ladder frame 1 and the second ladder frame 2 in the corresponding inside.

[0024] The first connecting plate 41 has 7 lock eyes 44 and the second connecting plate 42 has 3 lock eyes 44, when the folding ladder is completely folded, the 3 lock eyes 44 on the second connecting plate 42 coincide with 3 of the 7 lock eyes 44 on the first connecting plate 41, the three fixing claws 471 of the lock catch 47 are inserted into the 3 coinciding lock eyes 44, when the first ladder frame 1 and the second ladder frame 2 rotate around the elastic connecting shaft 45 of the locking device 4, the 3 lock eyes 44 on the second connecting plate 42 respectively coincide with 3 of the 7 lock eyes 44 on the first connecting plate 41 when the first ladder frame 1 and the second ladder frame 2 are at 0 degrees, 60 degrees and 180 degrees, so that the fixing claws 471 are inserted into the coinciding lock eyes 44, the locking device 4 is locked, the triangular structure has strong stability, can increase the stability of the folding ladder when in use, and can also increase the service life of the folding ladder.

[0025] The lock catch 47 has three fixing claws 471 which can be inserted into the 3 lock eyes 44, so as to fix the first connecting plate 41 and the second connecting plate 42 at corresponding angles.

[0026] The elastic connecting shaft 45 is a dustproof shaft, which can prevent dust or foreign matter from entering the elastic connecting shaft 45 when the folding ladder is in use, so that the elastic connecting shaft 45 loses elasticity and cannot work, increasing the use risk and reducing the service life of the folding ladder.

[0027] The second connecting plate 42 is provided with a safety catch hole 421, a safety catch of metal material can be inserted into the safety catch hole 421, when the first ladder frame 1 and the second ladder frame 2 are at 180 degrees, the safety catch of metal material can block the first connecting plate 41, further increasing the stress point when the first ladder frame 1 and the second ladder frame 2 are at 180 degrees, making the folding ladder safer and more stable when in use, reducing the wear of the folding ladder and increasing the service life of the folding ladder.

[0028] The fixed clamping plate 48 is made of plastic wear-resistant material, the plastic material has good elasticity, which can reduce the rigid friction between the first connecting plate 41 and the first and third ladder columns 11 and 21, and between the second connecting plate 42 and the second and fourth ladder columns 12 and 22, avoiding deformation of the connection between the connecting plate and the ladder column during long-term use, and increasing the safety of the user when in use.

[0029] The safety catch can be made of materials available on site, such as a screwdriver commonly used in construction, or a relatively hard stick-shaped object, which can also have the corresponding safety effect.

[0030] In implementation, the pedal 3 is installed between the first 11 and the second 12 column to connect the first 11 and the second 12 column together, forming the first 1, the pedal 3 is installed between the third 21 and the fourth 22 column to connect the third 21 and the fourth 22 column together, forming the second 2, the first connecting plate 41 is inserted into the second connecting plate 42, the connecting shaft hole 43 on the first connecting plate 41 and the second connecting plate 42 is coincided, the elastic connecting shaft 45 with the lock catch 47 is inserted into the connecting shaft hole 43, the three fixed claws 471 on the lock catch 47 is inserted into the lock hole 44 on the first connecting plate 41 and the second connecting plate 42, then the outer wall of the elastic connecting shaft 45 is welded with the second connecting plate 42, the lock catch 47 is welded on one end of the elastic connecting shaft 45, the knob 46 is installed on the other end of the elastic connecting shaft 45 through the thread, when the knob 46 is pressed to press the elastic connecting shaft 45, the fixed claws 471 of the lock catch 47 is pulled out of the lock hole 44 on the first connecting plate 41 and the second connecting plate 42, when the knob 46 is released, the elastic connecting shaft 45 rebounds, the fixed claws 471 of the lock catch 47 is inserted into the lock hole 44 on the first connecting plate 41 and the second connecting plate 42 again, two sets of assembled locking devices 4 are taken, the first connecting plate 41 and the fixed clamp plate 48 of the locking device 4 is inserted into the first 11 and the third 21 column, and is fixed through the nut, the second connecting plate 42 and the fixed clamp plate 48 of the locking device 4 is inserted into the second 12 and the fourth 22 column, and is fixed through the nut, the first 1 and the second 2 are connected together, the knob 46 of the two sets of locking devices 4 is outside, the lock catch 47 is inside and is installed on the first 1 and the second 2 correspondingly, when the folding ladder is not used, the first 1 and the second 2 are folded together, the first 1 and the second 2 are parallel, which is convenient for carrying and storing, when the folding ladder is used in the working environment of the ladder, the knob 46 of the two sets of locking devices 4 is pressed at the same time, the three fixed claws 471 of the lock catch 47 is pulled out of the lock hole 44, the first 1 or the second 2 is rotated, when the first 1 and the second 2 are 60 degrees, the three lock holes 44 on the first connecting plate 41 and the second connecting plate 42 are coincided and are opposite to the three fixed claws 471 of the lock catch 47, the three fixed claws 471 of the lock catch 47 is inserted into the corresponding lock hole 44 under the action of the elastic force of the elastic connecting shaft 45, the folding ladder is locked and fixed, when the folding ladder is used in the working environment of the straight ladder, the knob 46 of the two sets of locking devices 4 is pressed at the same time, the three fixed claws 471 of the lock catch 47 is pulled out of the lock hole 44, the first 1 or the second 2 is rotated, when the first 1 and the second 2 are 180 degrees, the three lock holes 44 on the first connecting plate 41 and the second connecting plate 42 are coincided and are opposite to the three fixed claws 471 of the lock catch 47, the three fixed claws 471 of the lock catch 47 is inserted into the corresponding lock hole 44 again under the action of the elastic connecting shaft 45, the folding ladder is locked and fixed, at the same time, the safety catch of metal material is inserted into the safety catch hole 421,The first connecting plate 41 on the first 11 and the third 21 of the ladder is blocked, so that the folding ladder in the straight ladder state is more stable.

[0031] The above is only the preferred embodiment of the present application, it should be pointed out that, for the folding ladder field, without departing from the inventive concept of the present application, under the premise of can make a number of deformation and improvement, these all belong to the protection scope of the present application.

Claims

1. A folding ladder, characterized in that: The folding ladder includes a first ladder frame (1), a second ladder frame (2), and a locking device (4). The first ladder frame (1) includes a first ladder post (11), a second ladder post (12), and a step (3). The step (3) is installed on the first ladder post (11) and the second ladder post (12), connecting the first ladder post (11) and the second ladder post (12) together to form the first ladder frame (1). The second ladder frame (2) includes a third ladder post (21), a fourth ladder post (22), and a step (3). The step (3) is installed on the third ladder post (21) and the fourth ladder post (22), connecting the third ladder post (21) and the fourth ladder post (22) together to form the second ladder frame (2). The locking device... (4) Includes: a first connecting plate (41), a second connecting plate (42), a connecting shaft hole (43), a keyhole (44), a safety bolt hole (421), a flexible connecting shaft (45), a knob (46), a latch (47), a fixing claw (471), and a fixing clamp (48). The first connecting plate (41) is a single piece, and the first connecting plate (41) is provided with a connecting shaft hole (43) and a keyhole (44). The second connecting plate (42) consists of two pieces, and the second connecting plate (42) is provided with a connecting shaft hole (43), a keyhole (44), and a safety bolt hole (421). The two second connecting plates (42) place the first connecting plate (41) in the middle. The connecting shafts on the first connecting plate (41) and the second connecting plate (42) are connected. The shaft holes (43) overlap each other. The elastic coupling (45) passes through the coupling hole (43) to connect the first connecting plate (41) and the second connecting plate (42) together and is welded and fixed on the second connecting plate (42). The knob (46) is installed on one end of the elastic coupling (45) by thread. The latch (47) is provided with a fixing claw (471). The latch (47) is installed on the other end of the elastic coupling (45) by welding. At the same time, the fixing claw (471) on the latch (47) is engaged in the corresponding keyhole (44) on the first connecting plate (41) and the second connecting plate (42). The first connecting plate (41) in both locking devices (4) is clamped in the middle by two fixing plates (48). Insert the first ladder column (11) and the third ladder column (21) into the first ladder column (11) and the third ladder column (21) into the second ladder column (22) and fix them with nuts. The second connecting plate (42) is clamped in the middle by three fixing plates (48) and inserted into the second ladder column (12) and the fourth ladder column (22) into the second ladder column (12) and the third ladder column (22) into the third ladder column (21) into the second ladder column (1) and the third ladder column (21) into the second ladder column (2) respectively by fixing with nuts. The first ladder frame (1) and the second ladder frame (2) are connected together. The knobs (46) of the two locking devices (4) are on the outside and the latches (47) are on the inside and are installed on the first ladder frame (1) and the second ladder frame (2) respectively.

2. A folding ladder according to claim 1, characterized in that: The first connecting plate (41) has 7 keyholes (44) and the second connecting plate (42) has 3 keyholes (44).

3. A folding ladder according to claim 1, characterized in that: The latch (47) has three fixing claws (471).

4. A folding ladder according to claim 1, characterized in that: The elastic coupling (45) is a dustproof shaft.

5. A folding ladder according to claim 1, characterized in that: The fixing clamp (48) is made of wear-resistant plastic material.

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