Folding working ladder

Abstract

The utility model provides a folding working ladder, and belongs to the technical field of aviation equipment. Comprising a first ladder assembly and a second ladder assembly, the second ladder assembly comprises a supporting frame, a second movable ladder assembly and a third movable ladder assembly, the first ladder assembly is detachably connected with the upper edge of the supporting frame through a first limiting piece, an opening is formed in the top of the supporting frame, and the second movable ladder assembly is hinged to the top opening of the supporting frame; and the third movable ladder assembly is vertically and slidably connected to the top of the second movable ladder assembly. By storing the third movable ladder assembly and the second movable ladder assembly, the whole working ladder can be adjusted to different heights, and by storing the first ladder assembly and the supporting frame, the whole working ladder can be folded and stored to be approximately one fourth of the height of an original working ladder, and the working ladder has the effect of being convenient to store.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation equipment, in particular to a foldable working ladder. Background Art

[0002] With the rapid development of my country's aviation industry and the increase in the number of aircraft, the requirements for the structure, control and safety of aircraft maintenance tools (especially aircraft maintenance work ladders) are becoming higher and higher.

[0003] Since there are many types of aircraft, large aircraft are larger in size and the height of the parts that need to be repaired is also relatively high. In order to facilitate the maintenance team to climb up, a work ladder is usually required. Traditional work ladders are made of welded metal pipes and metal plates.

[0004] Since traditional work ladders are one-piece welded structures, the height of ordinary warehouses is not enough to store the work ladders, and placing them outdoors for a long time can easily cause the work ladders to rust. Utility Model Content

[0005] In view of the above problems, the utility model provides a foldable working ladder.

[0006] In order to achieve the above-mentioned invention object, the technical solution adopted by the utility model is as follows:

[0007] A foldable working ladder is provided, comprising a first ladder frame assembly and a second ladder frame assembly, wherein the second ladder frame assembly comprises a supporting frame, a second movable ladder frame and a third movable ladder frame, and the first ladder frame assembly is detachably connected to the upper edge of the supporting frame through a first stopper;

[0008] An opening is provided at the top of the support frame, and the second movable ladder frame is hinged at the top opening of the support frame. The support frame is provided with a second limit member for limiting the second movable ladder frame from rotating out of / into the support frame. The third movable ladder frame is vertically slidably connected to the top of the second movable ladder frame, and the second movable ladder frame is provided with a third limit member for limiting the third movable ladder frame.

[0009] Furthermore, the first limiting member includes a first limiting pin, a first connecting ear is arranged at the top of the first ladder frame assembly, a second connecting ear is fixedly arranged at the top edge of the supporting frame, and a first pin hole adapted to the first limiting pin is provided on the first connecting ear and the second connecting ear. The first limiting pin is simultaneously passed through the first pin holes on the first ladder frame assembly and the supporting frame to limit the connection state of the first ladder frame assembly and the supporting frame.

[0010] Furthermore, the second limiting member includes a pin rod, the side surface of the second movable ladder frame is a right-angled trapezoid, the hinge axis of the second movable ladder frame and the supporting frame is located at a right angle to the second movable ladder frame, and the right-angle edges on both sides of the hinge axis on the side walls of the second movable ladder frame are penetrated by a first positioning hole coaxial with the hinge axis, and the upper edge of the support frame is penetrated by a second positioning hole adapted for the pin rod, and the pin rod is inserted into the first positioning hole and the second positioning hole at the same time to fix the supporting frame and the second movable ladder frame.

[0011] Furthermore, a plurality of guide rods are provided on the third movable ladder frame, and a guide wheel is rotatably provided on the second movable ladder frame, and a vertical movable channel is formed between the guide wheel and the second movable ladder frame, and the guide rod is slidably penetrated in the movable channel, and the third limiting member includes a second limiting pin, and the second movable ladder frame and the guide rod are both penetrated with a second pin hole adapted to the second limiting pin, and a plurality of second pin holes on the guide rod are evenly spaced in the vertical direction, and the second limiting pin is simultaneously penetrated through the second pin holes on the second movable ladder frame and the guide rod to limit the sliding of the third movable ladder frame.

[0012] Furthermore, the first ladder frame assembly includes a first fixed ladder frame and a first movable ladder frame slidably connected to one side of the first fixed ladder frame parallel to the extension direction of the first fixed ladder frame, the top of the first movable ladder frame is provided with a first connecting ear for detachably connecting to the supporting frame, the first fixed ladder frame is provided with at least two third limit pins for limiting the movement of the first movable ladder frame, the bottom side wall of the first movable ladder frame and the top side wall of the first fixed ladder frame are provided with third pin holes adapted to the third limit pins, and the third limit pins are simultaneously inserted into the third pin holes on the first fixed ladder frame and the first movable ladder frame to limit the first movable ladder frame from extending out of the first fixed ladder frame.

[0013] Furthermore, the supporting frame includes a fixed frame body, which is in the shape of a cube, and the four corners of the bottom wall of the fixed frame are hingedly connected to support columns, and the end of the support column away from the fixed frame is also hingedly connected to a connecting rod, which connects the end away from the support column and is detachably connected to the end of the adjacent support column away from the fixed frame, and also includes a reinforcing rod, the two ends of the reinforcing rod are respectively detachably connected to the movable end of the supporting column in a state perpendicular to the bottom wall of the fixed frame and the bottom wall of the fixed frame.

[0014] Furthermore, the third movable ladder frame includes a bracket and a turning frame. The bracket is vertically slidably connected to the second movable ladder frame. The turning frame is provided with steps. The top of the turning frame is hinged to the upper edge of the bracket. The bottom end of the turning frame is slidably connected with an insertion rod along its own length. A slot is provided at the end of the insertion rod away from the turning frame. An elastic member is provided in the turning frame for driving the insertion rod to extend relative to the turning frame. A positioning rod for cooperating with the slot is fixedly provided on the second movable ladder frame.

[0015] The beneficial effects of the utility model are as follows: the entire working ladder can be adjusted to different heights by storing the third movable ladder frame and the second movable ladder frame, and the entire working ladder can be folded and stored to approximately one-fourth of the height of the original working ladder by storing the first ladder frame assembly and the supporting frame, which greatly reduces the height and floor space of the various components of the working ladder after folding, and is convenient for storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the foldable work ladder in the fully unfolded state according to an embodiment of the present application.

[0017] Figure 2 for Figure 1 A partial enlarged schematic diagram of part A.

[0018] Figure 3 This is a schematic diagram of the structure of the third movable ladder frame in the storage state of an embodiment of the present application.

[0019] Figure 4 This is a schematic structural diagram of the second movable ladder frame in the storage state of an embodiment of the present application.

[0020] Figure 5 This is a schematic structural diagram of the first ladder rack assembly in the storage state according to an embodiment of the present application.

[0021] Figure 6 This is a schematic diagram of the structure of the support frame in the storage state of an embodiment of the present application.

[0022] Among them, 1. the first ladder frame assembly; 11. the first fixed ladder frame; 12. the first movable ladder frame; 13. the third limit pin; 2. the second ladder frame assembly; 21. the support frame; 22. the second movable ladder frame; 221. the first support plate; 23. the third movable ladder frame; 231. the guide rod; 232. the turning frame; 233. the insertion rod; 234. the positioning rod; 235. the second support plate; 24. the first limit pin; 25. the pin rod; 26. the second limit pin; 3. the support frame; 31. the fixed frame; 32. the support column; 33. the connecting rod; 34. the reinforcing rod; 4. the handrail rod; 41. the connecting rod. DETAILED DESCRIPTION

[0023] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] The present application embodiment discloses a foldable working ladder, referring to Figure 1 , Figure 2 and Figure 3, including a first ladder frame assembly 1 and a second ladder frame assembly 2, the first ladder frame assembly 1 is provided with an inclined stepped ladder, the second ladder frame assembly 2 includes a support frame 321, a second movable ladder frame 22 and a third movable ladder frame 23, the first ladder frame assembly 1 is detachably connected to the upper edge of the support frame 321 through a first limiting piece, the upper edge height of the first ladder frame assembly 1 is substantially flush with the top wall height of the support frame 321, an opening is provided at the top of the support frame 321, the second movable ladder frame 22 is hinged at the top opening of the support frame 321, the side surface of the second movable ladder frame 22 is a right-angled trapezoid, the hinge axis of the second movable ladder frame 22 and the support frame 321 is located at a right angle to the side surface of the second movable ladder frame 22, and the support frame 321 is provided with a second limiting piece for limiting the second movable ladder frame 22 from rotating out of / into the support frame 321.

[0025] The second movable ladder frame 22 can be unfolded by rotating the second movable ladder frame 22 out of the support frame 321 and making the bottom side of the right-angled trapezoid parallel to the top wall of the support frame 321, and the second movable ladder frame 22 is limited and fixed. The side of the second movable ladder frame 22 is provided with steps, and when the second movable ladder frame 22 is unfolded, the steps are close to the position of the first limiter.

[0026] The third movable ladder frame 23 has steps on one side, and the steps on the third movable ladder frame 23 and the second movable ladder frame 22 are located on the same side. By unfolding the second movable ladder frame 22 and the third movable ladder frame 23, and then connecting the first ladder frame assembly 1 with the support frame 321, a complete working ladder can be formed. After the second ladder frame assembly 2 is stored and the first ladder frame assembly 1 is separated from the second ladder frame assembly 2, the overall height of the working ladder can be reduced by about half, and the working ladder can be separated into two parts and transported separately, reducing the workload of transporting a single-part working ladder.

[0027] Reference Figure 4 Specifically, the first limiting member includes a first limiting pin 24, a first connecting ear is provided at the top of the first ladder frame assembly 1, and a second connecting ear is fixedly provided at the top edge of the support frame 321. The first connecting ear and the second connecting ear are both provided with a first pin hole adapted to the first limiting pin 24. The first limiting pin 24 is simultaneously passed through the first pin holes on the first ladder frame assembly 1 and the support frame 321 to limit the connection state of the first ladder frame assembly 1 and the support frame 321.

[0028] The second limiting member includes a pin rod 25. The right-angle edges on both sides of the hinge axis on the side walls of the second movable ladder frame 22 are penetrated with a first positioning hole coaxial with the hinge axis. The upper edge of the support frame 321 is penetrated with a second positioning hole adapted for the pin rod 25. The pin rod 25 is inserted into the first positioning hole and the second positioning hole at the same time to fix the support frame 321 and the second movable ladder frame 22.

[0029] The third movable ladder frame 23 is provided with multiple guide rods 231, and the second movable ladder frame 22 is rotatably provided with guide wheels, and a vertical movable channel is formed between the guide wheels and the second movable ladder frame 22. The guide rod 231 is slidably penetrated in the movable channel, and the third limiting member includes a second limiting pin 26. The second movable ladder frame 22 and the guide rod 231 are both penetrated with second pin holes adapted to the second limiting pin 26. A plurality of second pin holes on the guide rod 231 are evenly spaced in the vertical direction, and the second limiting pin 26 is simultaneously penetrated in the second pin holes on the second movable ladder frame 22 and the guide rod 231 to limit the sliding of the third movable ladder frame 23.

[0030] Furthermore, a first support plate 221 is fixed to the second movable ladder frame 22. When the second movable ladder frame 22 is rotated and retracted into the support frame 321, the first support plate 221 adheres to and closes the upper opening of the support frame 321, so that the first ladder frame assembly 1 and the second ladder frame assembly 2 can be connected even when the second movable ladder frame 22 is not unfolded, thereby meeting the maintenance needs of the aircraft at a lower altitude.

[0031] Furthermore, an opening for the third movable ladder frame 23 to be raised and lowered is provided on the top wall of the second movable ladder frame 22. The third movable ladder frame 23 includes a bracket and a flip frame 232. The bracket is vertically slidably connected to the second movable ladder frame 22. A second support plate 235 is fixed on the top wall of the bracket. The edge of the second support plate 235 extends outward. When the bracket is lowered and stored in the second movable ladder frame 22, the second support plate 235 closes the opening at the top of the second movable ladder frame 22. The flip frame 232 is provided with steps. The top of the flip frame 232 is hinged to the upper edge of the bracket. The bottom end of the flip frame 232 is slidably connected to the insertion rod 233 along its own length. A slot is provided at one end of the insertion rod 233 away from the flip frame 232. An elastic member for driving the insertion rod 233 to extend relative to the flip frame 232 is provided in the flip frame 232. A positioning rod 234 for cooperating with the slot is fixed on the second movable ladder frame 22. The elastic member can be a spring, and an anti-drop mechanism is provided between the flip frame 232 and the insertion rod 233. When the third movable ladder frame 23 is used, the bracket is lifted from the second movable ladder frame 22, and the insertion rod 233 is manually pushed to flip the flip frame 232 out and plug the insertion rod 233 into the positioning rod 234 on the second movable ladder frame 22. When the third movable ladder frame 23 is not needed to increase the height of the working ladder, the third movable ladder frame 23 is stored in the second movable ladder frame 22, and the staff can also stand on the second support plate 235 to work.

[0032] Reference Figure 5In order to further reduce the height of the working ladder during the storage process, in the embodiment of the present application, the first ladder frame assembly 1 includes a first fixed ladder frame 11 and a first movable ladder frame 12 slidably connected to one side of the first fixed ladder frame 11 parallel to the extension direction of the first fixed ladder frame 11, the top of the first movable ladder frame 12 is provided with a first connecting ear for detachably connecting with the support frame 321, the first fixed ladder frame 11 is provided with at least two third limiting pins 13 for limiting the movement of the first movable ladder frame 12, the bottom side wall of the first movable ladder frame 12 and the top side wall of the first fixed ladder frame 11 are both provided with third pin holes adapted to the third limiting pins 13, and the third limiting pins 13 are simultaneously inserted into the third pin holes on the first fixed ladder frame 11 and the first movable ladder frame 12 to limit the first movable ladder frame 12 from extending out of the first fixed ladder frame 11. Through this structure, the height of the first ladder frame assembly 1 in the storage state can be reduced by nearly half.

[0033] Reference Figure 6 The support frame 321 includes a fixed frame 31, which is in the shape of a cube. The four corners of the bottom wall of the fixed frame 31 are hingedly connected to support columns 32. The end of the support column 32 away from the fixed frame 31 is also hingedly connected to a connecting rod 33, which is detachably connected to the end of the adjacent support column 32 away from the fixed frame 31. The connecting rod 33 and the support column 32 can be connected by bolts. By removing the movable end of the connecting rod 33 and the support column 32 at the lower half of the support frame 321, and then folding the connecting rod 33 and the support column 32 to be parallel to the lower edge of the fixed frame 31, the height of the second ladder frame assembly 2 in the storage state can be further reduced.

[0034] Furthermore, it also includes a reinforcing rod 34, the two ends of which are detachably connected to the movable end of the support column in a state perpendicular to the bottom wall of the fixed frame 31 and the bottom wall of the fixed frame 31. Both ends of the reinforcing rod are connected to the support column and the fixed frame 31 by bolts. The reinforcing rod 34 is evenly distributed on the four sides of the fixed frame 31 in a circumferential shape, and is supported between the support column and the fixed frame 31 when the support frame 321 is in an expanded state, so as to improve the structural stability of the powder in the lower half of the support frame 321.

[0035] Optionally, movable handrails can be provided on both sides of the steps of each movable ladder frame, and the handrails include a square handrail rod 4 extending parallel to the steps. The handrail rod 4 is connected to the movable ladder frame by a plurality of mutually parallel connecting rods 41, and both ends of the connecting rod 41 are hingedly connected to the handrail rod 4 and the movable ladder frame by bolts. The handrail rod 4 and the connecting rod 41 are fixed by adjusting the tightness of the bolts at both ends of the connecting rod 41.

[0036] It should be understood by those skilled in the art that, although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A foldable working ladder, characterized in that: It comprises a first ladder frame assembly and a second ladder frame assembly, wherein the second ladder frame assembly comprises a supporting frame, a second movable ladder frame and a third movable ladder frame, and the first ladder frame assembly is detachably connected to the upper edge of the supporting frame through a first stopper; The top of the support frame is provided with an opening, the second movable ladder frame is hinged at the top opening of the support frame, the support frame is provided with a second limit member for limiting the second movable ladder frame from rotating out of / into the support frame, the third movable ladder frame is vertically slidably connected to the top of the second movable ladder frame, and the second movable ladder frame is provided with a third limit member for limiting the third movable ladder frame.

2. A foldable working ladder according to claim 1, characterized in that: The first limiting member includes a first limiting pin, a first connecting ear is arranged on the top of the first ladder frame assembly, a second connecting ear is fixedly arranged on the top edge of the supporting frame, and a first pin hole adapted to the first limiting pin is opened on the first connecting ear and the second connecting ear. The first limiting pin is simultaneously passed through the first pin holes on the first ladder frame assembly and the supporting frame to limit the connection state of the first ladder frame assembly and the supporting frame.

3. A foldable working ladder according to claim 1, characterized in that: The second limiting member includes a pin rod, the side surface of the second movable ladder frame is a right-angled trapezoid, the hinge axis of the second movable ladder frame and the supporting frame is located at a right angle to the second movable ladder frame, and the right-angle edges on both sides of the hinge axis on the side wall of the second movable ladder frame are penetrated by a first positioning hole coaxial with the hinge axis, and the upper edge of the support frame is penetrated by a second positioning hole adapted for the pin rod, and the pin rod is inserted into the first positioning hole and the second positioning hole at the same time to fix the supporting frame and the second movable ladder frame.

4. A foldable working ladder according to claim 3, characterized in that: The third movable ladder frame is provided with multiple guide rods, and the second movable ladder frame is rotatably provided with guide wheels, a vertical movable channel is formed between the guide wheels and the second movable ladder frame, the guide rod is slidably penetrated in the movable channel, the third limiting member includes a second limiting pin, and the second movable ladder frame and the guide rod are both penetrated with second pin holes adapted to the second limiting pin, and a plurality of second pin holes on the guide rod are evenly spaced in the vertical direction, and the second limiting pin is simultaneously penetrated into the second pin holes on the second movable ladder frame and the guide rod to limit the sliding of the third movable ladder frame.

5. A foldable working ladder according to claim 2, characterized in that: The first ladder frame assembly includes a first fixed ladder frame and a first movable ladder frame slidably connected to one side of the first fixed ladder frame parallel to the extension direction of the first fixed ladder frame, the top of the first movable ladder frame is provided with a first connecting ear for detachably connecting to a supporting frame, the first fixed ladder frame is provided with at least two third limit pins for limiting the movement of the first movable ladder frame, the bottom side wall of the first movable ladder frame and the top side wall of the first fixed ladder frame are provided with third pin holes adapted to the third limit pins, and the third limit pins are simultaneously penetrated through the third pin holes on the first fixed ladder frame and the first movable ladder frame to limit the first movable ladder frame from extending out of the first fixed ladder frame.

6. A foldable working ladder according to claim 1, characterized in that: The support frame includes a fixed frame body, which is in the shape of a cube. The four corners of the bottom wall of the fixed frame body are hingedly connected to support columns. The end of the support column away from the fixed frame body is also hingedly connected to a connecting rod. The end of the connection away from the support column is detachably connected to the end of the adjacent support column away from the fixed frame body. The support frame also includes a reinforcing rod. The two ends of the reinforcing rod are respectively detachably connected to the movable end of the support column in a state perpendicular to the bottom wall of the fixed frame body and the bottom wall of the fixed frame body.

7. A foldable working ladder according to claim 1, characterized in that: The third movable ladder frame includes a bracket and a flip frame, the bracket is vertically slidably connected to the second movable ladder frame, the flip frame is provided with steps, the top of the flip frame is hinged to the upper edge of the bracket, the bottom end of the flip frame is slidably connected with an insertion rod along its own length, a slot is provided at one end of the insertion rod away from the flip frame, an elastic member for driving the insertion rod to extend relative to the flip frame is provided in the flip frame, and a positioning rod for cooperating with the slot is fixedly provided on the second movable ladder frame.

Images