A foldable climbing ladder

Abstract

The present invention belongs to the technical field of climbing ladders, and specifically relates to a foldable climbing ladder, which mainly includes a support, handrails, foot pedals, a limiting mechanism, a pull-out member, etc. The support includes a folding support and a fixed support, and the folding support includes an upper support and a lower support. The folding support is provided with a handrail, and the handrails and foot pedals on the upper support and the lower support are fixed by indexing pins. The upper support of the folding ladder is fixed to the front wall of the cabin body and connected to the lower support by a pin shaft to realize the flipping and folding of the lower support. After the lower support is folded to the appropriate position of the upper support, it is limited by a stop pin to ensure the locking performance of the folding ladder. After the climbing ladder is folded, the foot pedal and the handrail occupy very little space, and the upper support and the lower support are folded into one. The folding ladder solves the problems of large size, cumbersome use, poor use feeling and poor safety of the existing climbing ladder, and can be widely used in climbing occasions of various equipment cabins.

Description

Technical Field

[0001] The invention belongs to the technical field of climbing ladders, and in particular relates to a foldable climbing ladder. Background Art

[0002] Climbing ladders are mainly used for climbing operations of various types of van vehicles. According to the characteristics of the use of climbing ladders, it is necessary to overcome the many defects of traditional metal ladders. Climbing ladders are required to be applicable to different regions, different conditions and different development needs, and have the advantages of good corrosion resistance and flame retardancy, high strength, and easy installation. The cross-sectional size of the special-section cabin is small, and the cabin is long and narrow, and its internal space can only meet the equipment installation requirements. In order to facilitate personnel to operate the equipment on the cabin roof, a suitable climbing ladder needs to be designed, and the climbing ladder cannot exceed the external dimensions of the cabin itself; the traditional climbing ladder is mainly made of simple round tubes and installed on the outer wall of the regular box cabin; during the climbing process, the force surface of the feet is very small, the comfort is poor, and the protection measures are lacking, which is very easy to fall.

[0003] Therefore, it is necessary to make improvements to the above problems. Summary of the invention

[0004] In order to overcome the deficiencies in the prior art, the present invention provides a foldable climbing ladder, which can solve the problems of the existing climbing ladders being large in size, cumbersome to use, poor in usability and poor in safety.

[0005] The technical solution adopted by the present invention is:

[0006] A foldable climbing ladder comprises a cabin, a support, a handrail, a pedal and a limit device, the support comprising a folding support and a fixed support, the folding support comprising an upper support and a lower support; the cabin and the upper support are fixedly connected by bolts, the support structure comprises a rectangular frame, and rectangular plates are vertically welded on the outer edges of the long sides of both sides of the rectangular frame, and each rectangular plate and the long side of the rectangular frame form an L-shaped structure; a support connecting plate is vertically welded to the inner side of the rectangular frame at the lower end of the upper support, and two vertical connecting seats are symmetrically welded on the lower plate surface of the support connecting plate, and two connecting seats are vertically welded on the upper end of the lower support, and the connecting seats at the lower end of the upper support and the upper end of the lower support are respectively rotatably connected by pins; the lower support The lower end is welded to the upper end of the fixed support at a large angle; the pedal is a cuboid without a bottom surface, the pedal plate is arranged upward and perpendicular to the inner side of the support, the pedal on the fixed support is welded to the fixed support, one end of the two outer sides of the pedal on the folding support is respectively placed on the inner sides of the two rectangular plates, and the pedal on the folding support is rotatably connected to the corresponding positions of the rectangular plates of the support through pins; the armrest is a rectangular strip, and the other ends of the two outer sides of the pedal on the folding support are rotatably connected to the armrests on both sides through pins; a limiting device is installed under the pedals of the upper support except the pedal at the bottom end, and a support frame is provided under the pedal at the top end of the fixed support, and the support frame and the pedal together form a triangle.

[0007] The limit device includes a limit frame and a limit rod. The upper support is located on the inner sides of the two side rectangular plates below the pedal and are symmetrically connected to the limit frames. One side of the limit frame is fixed to the rectangular plate, and a length limit groove is opened in the middle of the other opposite side. Two connecting seats are symmetrically fixed on the lower plate surface of the pedal, and each connecting seat and the limit groove are rotatably connected to a limit rod through a pin shaft.

[0008] A rectangular indexing pin plate with through holes is welded to the inner side of the rectangular plates on both sides of the folding support, and through holes are provided on the handrails on both sides above a pedal in the middle of the upper support and the lower support. After the climbing ladder is folded, the through holes on the respective handrails correspond to the positions of the through holes on the respective indexing pin plates and are connected by indexing pins.

[0009] A stop pin plate with through holes is welded to one side of the upper support near the lower end and one side of the lower support near the upper end. After the climbing ladder is folded, the through holes on the stop pin plates of the upper support and the lower support correspond to each other and are connected by stop pins.

[0010] A pull-out piece is welded at a large angle at the lower end of the lower support, and the pull-out piece includes a frame body and a pull-out rod. There are two pull-out rods, which are arranged on the inner side of the middle part of the frame body opposite to each other. An anti-slip plate is installed at the part of the frame body that contacts the ground.

[0011] The length of the pedal at the uppermost end of the fixed support is longer than the length of the fixed support, and a groove is provided at the intersection of the pedal and the fixed support.

[0012] There are three pedals on the upper support, two pedals on the lower support, and three pedals on the fixed support. The pedals are 251 mm long and 150 mm wide.

[0013] The overall width of the climbing ladder is 340 mm, the height after folding is 1770 mm, the height after unfolding is no higher than 2680 mm, and the thickness after folding is 119 mm.

[0014] When the climbing ladder is unfolded, the angle between the lower support and the upper support is 164°.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention divides the climbing ladder into three parts, two of which are foldable parts. The thickness of the foldable part is only 119 mm after folding, and the two foldable parts are finally folded into one, which greatly saves space.

[0017] 2. The pedal of the present invention is not a traditional round steel, but a pedal, which is comfortable to use, and handrails are installed on both sides of the pedal, which is safe. After folding after use, the space occupied by the pedal and the handrails is greatly reduced.

[0018] 3. The present invention uses indexing pins, stop pins, and pin shaft connections in various links, which enhances the foldability and fixity of the climbing ladder and enables the climbing ladder to be freely unfolded and folded.

[0019] In summary, the present invention has the advantages of simple structure, convenient operation, low cost, wide application range, and solves the problems of difficult layout and high installation requirements of climbing ladders in special-shaped equipment cabins. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a left view of the unfolded overall structure of the present invention;

[0021] Figure 2 It is a front view of the overall structure of the present invention;

[0022] Figure 3 It is a left view of the foldable overall structure of the present invention.

[0023] Among them: 1 is the cabin, 2 is the support, 3 is the handrail, 4 is the pedal, 5 is the limit device, 6 is the pull-out piece, 7 is the indexing pin plate, 8 is the stop pin plate, 9 is the indexing pin, 10 is the stop pin, 21 is the folding support, 22 is the fixed support, 23 is the upper support, 24 is the lower support, 25 is the rectangular frame, 26 is the rectangular plate, 27 is the support connecting plate, 41 is the support frame, 51 is the limit frame, 52 is the limit rod, 53 is the limit groove, 61 is the frame, 62 is the pull-out rod, and 63 is the anti-slip plate. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] like Figures 1 to 3 As shown, a foldable climbing ladder comprises a cabin 1, a support 2, a handrail 3, a pedal 4, a limit device 5 and a drawer 6, wherein the support 2 comprises a folding support 21 and a fixed support 22, wherein the folding support 21 comprises an upper support 23 and a lower support 24; the cabin 1 and the upper support 23 are fixedly connected by bolts, and the support 2 structure comprises a rectangular frame 25, and rectangular plates 26 are respectively vertically welded on the outer edges of the long sides of both sides of the rectangular frame 25, and each rectangular plate 26 and the long side of the rectangular frame 25 form an L-shaped structure;

[0026] A support connecting plate 27 is vertically welded to the inner side of the rectangular frame 25 at the lower end of the upper support 23, and two vertical connecting seats are symmetrically welded to the lower plate surface of the support connecting plate 27. Two connecting seats are vertically welded to the upper end of the lower support 24. The connecting seats at the lower end of the upper support 23 and the upper end of the lower support 24 are respectively rotatably connected through pins; the lower end of the lower support 24 is welded to the upper end of the fixed support 22 at a large angle;

[0027] The pedal 4 is a rectangular parallelepiped without a bottom surface, and the pedal 4 is arranged vertically with the inner side of the support 2 facing upwards. The pedal 4 on the fixed support 22 is welded to the fixed support 22, and one end of the two outer sides of the pedal 4 on the folding support 21 is respectively placed on the inner sides of the two rectangular plates 26, and the pedal 4 on the folding support 21 is rotatably connected with the corresponding positions of the rectangular plates 26 of the support 2 through a pin shaft;

[0028] The armrest 3 is in the shape of a rectangular strip, and the other ends of the two outer sides of the pedal 4 on the folding support 21 are rotatably connected to the armrests 3 on both sides through pins; a limiting device 5 is installed under the pedals 4 except the pedal 4 at the bottom of the upper support 23, and a support frame 41 is provided under the pedal 4 at the top end of the fixed support 22, and the support frame 41 and the pedal 4 together form a triangle.

[0029] The limiting device 5 includes a limiting frame 51 and a limiting rod 52. The upper support 23 is located on the inner sides of the rectangular plates 26 on both sides below the pedal 4 and is symmetrically connected to the limiting frames 51. One side of the limiting frame 51 is fixed to the rectangular plate, and a length limiting groove 53 is opened in the middle of the other opposite side. Two connecting seats are symmetrically fixed on the lower plate surface of the pedal 4, and each connecting seat and the limiting groove 53 are respectively connected to a limiting rod 52 through a pin shaft.

[0030] A rectangular indexing pin plate 7 with through holes is welded to the inner side of the rectangular plates 26 on both sides of the folding support 21, and through holes are provided on the handrails 3 on both sides above the pedal 4 in the middle of the upper support 23 and the lower support 24. After the climbing ladder is folded, the through holes on each handrail 3 correspond to the positions of the through holes on each indexing pin plate 7 and are connected by indexing pins 9.

[0031] A stop pin plate 8 with through holes is welded to one side of the lower end of the upper support 23 and one side of the upper end of the lower support 24. After the climbing ladder is folded, the through holes on the stop pin plates 8 of the upper support 23 and the lower support 24 correspond to each other and are connected by stop pins 10 respectively.

[0032] A pull-out piece 6 is welded at a large angle to the lower end of the lower support 24. The pull-out piece 6 includes a frame 61 and a pull-out rod 62. There are two pull-out rods 62, which are arranged on the inner side of the middle of the frame 61. An anti-skid plate 63 is installed at the part of the frame 61 that contacts the ground.

[0033] The length of the pedal 4 at the uppermost end of the fixed support 22 is longer than the length of the fixed support 22 , and a groove is provided at the intersection of the pedal 4 and the fixed support 22 .

[0034] There are three pedals 4 on the upper support 23, two pedals 4 on the lower support 24, and three pedals 4 on the fixed support 22. The pedals 4 are 251 mm long and 150 mm wide.

[0035] The overall width of the climbing ladder is 340 mm, the height after folding is 1770 mm, the height after unfolding is no higher than 2680 mm, and the thickness after folding is 119 mm.

[0036] When the climbing ladder is unfolded, the angle between the lower support 24 and the upper support 23 is 164°.

[0037] The upper support 23 of the climbing ladder of the present invention is fixed to the front wall of the cabin 1 and connected to the lower support 24 through a pin shaft to achieve the flipping and folding of the lower support 24. After the lower support 24 is folded to a suitable position, it is limited by a stop pin 10 to ensure the locking performance of the folding ladder.

[0038] The specific implementation process of the climbing ladder: during the unfolding operation, the stop pin 10 at the fixing position of the upper support 23 and the lower support 24 is rotated from the locked state to the adjustable state, the pull-out rod 62 is pulled down with the fixed support 22 and then the lower support 24 is driven, and the lower support 24 is slowly turned over until the lower support 24 is fully unfolded, and the indexing pins 9 (one on each side) of the fixed pedal 4 and the handrail 3 in the lower support 24 are rotated, and the handrail 3 is pulled to a horizontal state. At this time, the pedal 4 is linked with the handrail 3, and then the lower ends of the two handrails 3 are stuck on the pedal 4 at the upper end of the fixed support 22, and enter a stable horizontal state; the personnel climb to the upper support 23, rotate the indexing pins 9 (one on each side) of the fixed pedal 4 and the handrail 3 in the upper support 23, and pull the handrail 3 through the limit device 5. At this time, the pedal 4 is linked with the handrail 3 and enters a horizontal state; the personnel continue to climb upward to reach the top of the cabin 1. During the folding operation, the process is the reverse process of the unfolding operation.

[0039] Only the preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention, and various changes should be included in the protection scope of the present invention.

Claims

1. A foldable climbing ladder, characterized by: The invention comprises a cabin (1), a support (2), a handrail (3), a pedal (4) and a limit device (5), wherein the support (2) comprises a folding support (21) and a fixed support (22), and the folding support (21) comprises an upper support (23) and a lower support (24); the cabin (1) and the upper support (23) are fixedly connected by bolts, and the support (2) structure comprises a rectangular frame (25), and rectangular plates (26) are respectively vertically welded on the outer edges of the long sides of both sides of the rectangular frame (25), and each rectangular plate (26) and the long side of the rectangular frame (25) form an L-shaped structure; A support connecting plate (27) is vertically welded to the inner side of the rectangular frame (25) at the lower end of the upper support (23); two vertical connecting seats are symmetrically welded to the lower plate surface of the support connecting plate (27); two connecting seats are vertically welded to the upper end of the lower support (24); the connecting seats at the lower end of the upper support (23) and the upper end of the lower support (24) are rotatably connected via pins; the lower end of the lower support (24) is welded to the upper end of the fixed support (22) at a large angle; The pedal (4) is a rectangular parallelepiped without a bottom surface. The pedal (4) is arranged with its plate surface facing upward and perpendicular to the inner side of the support (2). The pedal (4) on the fixed support (22) is welded to the fixed support (22). One end of the two outer side surfaces of the pedal (4) on the folding support (21) is respectively placed on the inner side surfaces of the two rectangular plates (26). The pedal (4) on the folding support (21) is rotatably connected to the corresponding positions of the rectangular plates (26) of the support (2) via a pin shaft. The armrest (3) is in the shape of a rectangular strip, and the other ends of the two outer sides of the pedal (4) on the folding support (21) are rotatably connected to the armrests (3) on both sides via pins; a limiting device (5) is installed below the pedals (4) other than the pedal (4) at the bottom of the upper support (23); a support frame (41) is provided below the pedal (4) at the top of the fixed support (22), and the support frame (41) and the pedal (4) together form a triangle; The limiting device (5) comprises a limiting frame (51) and a limiting rod (52); the upper support (23) is located on the inner sides of the two rectangular plates (26) below the pedal (4) and is symmetrically connected to the limiting frames (51); one side of the limiting frame (51) is fixed to the rectangular plate, and a length limiting groove (53) is opened in the middle of the other side opposite to the upper support (23); two connecting seats are symmetrically fixed on the lower plate surface of the pedal (4); each connecting seat and the limiting groove (53) are rotatably connected to a limiting rod (52) via a pin shaft; A rectangular indexing pin plate (7) with through holes is welded to the inner side of the rectangular plates (26) on both sides of the folding support (21), and through holes are formed on the handrails (3) on both sides above a pedal (4) in the middle of the upper support (23) and the lower support (24). After the climbing ladder is folded, the through holes on the respective handrails (3) correspond to the positions of the through holes on the respective indexing pin plates (7) and are connected via indexing pins (9).

2. A foldable climbing ladder according to claim 1, characterized in that: A stop pin plate (8) with a through hole is welded to one side of the lower end of the upper support (23) and one side of the upper end of the lower support (24). When the climbing ladder is folded, the through holes on the stop pin plates (8) of the upper support (23) and the lower support (24) correspond to each other and are connected via stop pins (10).

3. A foldable climbing ladder according to claim 1, characterized in that: A drawer (6) is welded at a large angle to the lower end of the lower support (24); the drawer (6) comprises a frame (61) and a drawer rod (62); there are two drawer rods (62) which are arranged opposite to each other on the inner side of the middle of the frame (61); and an anti-slip plate (63) is installed at the portion of the frame (61) that contacts the ground.

4. A foldable climbing ladder according to claim 1, characterized in that: The length of the pedal (4) at the uppermost end of the fixed support (22) is longer than the length of the fixed support (22), and a groove is provided at the intersection of the pedal (4) and the fixed support (22).

5. The foldable climbing ladder according to claim 1, characterized in that: There are three pedals (4) on the upper support (23), two pedals (4) on the lower support (24), and three pedals (4) on the fixed support (22). The pedals (4) are 251 mm long and 150 mm wide.

6. A foldable climbing ladder according to claim 1, characterized in that: The overall width of the climbing ladder is 340 mm, the height after folding is 1770 mm, the height after unfolding is no higher than 2680 mm, and the thickness after folding is 119 mm.

7. The foldable climbing ladder according to claim 1, characterized in that: When the climbing ladder is unfolded, the included angle between the lower support (24) and the upper support (23) is 164°.

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