Lifting mechanism for working ladder

Abstract

The utility model discloses a lifting mechanism for a working ladder, and relates to the technical field of working ladders. Comprising an operating rod assembly, a lower telescopic pipe, an upper telescopic pipe, an L-shaped quick pull pin, a balance assembly and tension springs, a platform is installed on the balance assembly through screws, the balance assembly is connected to the operating rod assembly through screws, the operating rod assembly is installed on a ladder frame, the tension springs are hooked between the ladder frame and the balance assembly, and the lower telescopic pipe is sleeved with the upper telescopic pipe. The lower telescopic pipe is connected to the front portion of the ladder frame through a screw, the upper portion of the upper telescopic pipe is connected to the balance assembly through a screw, and the L-shaped quick-pull pin is inserted into the upper telescopic pipe. The working ladder platform is reasonable in structural design, stable ascending and descending of the working ladder platform can be rapidly completed through simple manual operation, and use of cabin doors of various models at different heights is met.

Description

Technical Field

[0001] The utility model relates to the technical field of working ladders, in particular to a lifting mechanism for working ladders. Background Art

[0002] When performing maintenance work in a hangar or on the apron, fixed work ladders are usually used. However, fixed work ladders cannot meet the universality of different door heights of various aircraft models, resulting in a large variety of fixed work ladders and waste of space. Manual lifting work ladders meet the universality of different door heights of various aircraft models, but they are complicated to operate, slow to lift, laborious to manually crank, and require regular lubrication. Both types of work ladders cannot meet the convenience of use and operation, and have low work efficiency.

[0003] In summary, the utility model designs a lifting mechanism for a working ladder. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a lifting mechanism for a work ladder with a reasonable structural design. Through simple manual operation, the work ladder platform can be quickly and smoothly raised and lowered to meet the different heights of cabin doors of various models.

[0005] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical scheme: a lifting mechanism for a working ladder, including an operating rod assembly, a lower telescopic tube, an upper telescopic tube, an L-shaped quick-pull pin, a balancing assembly and a tension spring, the platform is installed on the balancing assembly by screws, the balancing assembly is connected to the operating rod assembly by screws, the operating rod assembly is installed on the ladder frame, the tension springs are respectively hooked between the ladder frame and the balancing assembly, the lower telescopic tube is inserted into the upper telescopic tube, the lower telescopic tube is connected to the front of the ladder frame with screws, the upper part of the upper telescopic tube is connected to the balancing assembly by screws, and the L-shaped quick-pull pin is inserted into the upper telescopic tube.

[0006] Preferably, the operating rod assembly includes an operating handle, a lower lifting assembly, a bearing seat, and an upper lifting assembly. The lower lifting assembly is inserted into the bearing seats on both sides and installed on the ladder frame with screws. The operating handle is connected to the outside of the lower lifting assembly by screws, and the upper lifting assembly is connected to the lower lifting assembly by screws.

[0007] Preferably, the components are connected to the front balance pipe and the rear balance pipe respectively by screws; the lifting upper component is connected to the front balance pipe with screws, the upper end of the balance component is connected to the platform with screws, the lower end of the balance component is connected to the tension spring, and the other end of the tension spring is connected to the ladder frame.

[0008] Preferably, the movable tread assembly consists of a tread plate and a movable connecting plate, and the tread plate is welded to the inner side of the movable connecting plate.

[0009] Beneficial effects of the utility model: The lifting mechanism of the utility model is simple to operate and maintain for the lifting work ladder. The operating handle can be easily and quickly "rotated" to the specified height (according to the scale), and the L-shaped quick-pull pin is inserted into the positioning hole of the upper telescopic tube to play a safety limit role, and the operation is stable, safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The utility model is described in detail below with reference to the accompanying drawings and specific implementation methods;

[0011] Figure 1 It is the front view of the utility model;

[0012] Figure 2 It is a top view of the utility model;

[0013] Figure 3 This is a schematic diagram of the utility model in the highest state;

[0014] Figure 4 It is a schematic diagram of the utility model in the lowest state. DETAILED DESCRIPTION

[0015] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0016] Reference Figure 1-4 The present specific embodiment adopts the following technical scheme: a lifting mechanism for a working ladder, comprising an operating rod assembly 1, a lower telescopic tube 6, an upper telescopic tube 7, an L-shaped quick-pull pin 8, a balancing assembly 9 and a tension spring 15, wherein a platform A is mounted on the balancing assembly 9 by screws, the balancing assembly 9 is connected to the operating rod assembly 1 by screws, the operating rod assembly 1 is mounted on the ladder frame B, the tension springs 15 are respectively hooked between the ladder frame B and the balancing assembly 9, the lower telescopic tube 6 is inserted into the upper telescopic tube 7, the lower telescopic tube 6 is connected to the front of the ladder frame B by screws, the upper part of the upper telescopic tube 7 is connected to the balancing assembly 9 by screws, and the L-shaped quick-pull pin 8 is inserted into the upper telescopic tube 7.

[0017] It is worth noting that the operating rod assembly 1 includes an operating handle 2, a lower lifting assembly 3, a bearing seat 4, and an upper lifting assembly 5. The lower lifting assembly 3 is inserted into the bearing seats 4 on both sides and installed on the ladder frame with screws. The operating handle 2 is connected to the outside of the lower lifting assembly 3 by screws, and the upper lifting assembly 5 is connected to the lower lifting assembly 3 by screws.

[0018] It is worth noting that the balancing assembly 9 includes a front balancing pipe 10, a rear balancing pipe 11 and a movable step assembly 12, and the movable step assembly 12 is respectively connected to the front balancing pipe 10 and the rear balancing pipe 11 by screws; the lifting upper assembly 5 is connected to the front balancing pipe 10 with screws, the upper end of the balancing assembly 9 is connected to the platform with screws, the lower end of the balancing assembly 9 is connected to the tension spring 15, and the other end of the tension spring 15 is connected to the ladder frame B.

[0019] In addition, the movable step assembly 12 is composed of a step plate 13 and a movable connecting plate 14 , and the step plate 13 is welded to the inner side of the movable connecting plate 14 .

[0020] The working principle of this specific embodiment is as follows: the platform is screwed onto the balance assembly 9, the balance assembly 9 is screwed onto the operating rod assembly 1, the operating rod assembly 1 is mounted onto the ladder frame, and the tension spring 15 is hooked between the ladder frame and the balance assembly 9. The lower telescopic tube 6 is inserted into the upper telescopic tube 7, the lower telescopic tube 6 is screwed onto the ladder frame, and the upper telescopic tube 7 is screwed onto the balance assembly to play the role of fixing the support platform and limiting the position. By operating the handle 2, the front balance tube 10 and the rear balance tube 11 can rotate at the same angular velocity and always move in parallel. By utilizing the tension and reaction force of the tension spring 15, the operator can easily rotate the designated high position by the operating handle 2 and limit the position with the L-shaped quick-pull pin 8, so that the platform can be raised and lowered in parallel.

[0021] This specific implementation method designs an operating rod assembly, a lower telescopic tube, an upper telescopic tube, an L-shaped quick-pull pin, a balance assembly, a tension spring, etc. Through simple manual operations, the working ladder platform can be quickly and smoothly raised and lowered to meet the different heights of cabin doors of various models.

[0022] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A lifting mechanism for a working ladder, characterized in that: The utility model comprises an operating rod assembly (1), a lower telescopic tube (6), an upper telescopic tube (7), an L-shaped quick-pull pin (8), a balancing assembly (9) and a tension spring (15). The platform (A) is mounted on the balancing assembly (9) by screws, the balancing assembly (9) is connected to the operating rod assembly (1) by screws, the operating rod assembly (1) is mounted on a ladder frame (B), the tension spring (15) is respectively hooked between the ladder frame (B) and the balancing assembly (9), the lower telescopic tube (6) is inserted into the upper telescopic tube (7), the lower telescopic tube (6) is connected to the front part of the ladder frame (B) by screws, the upper part of the upper telescopic tube (7) is connected to the balancing assembly (9) by screws, and the L-shaped quick-pull pin (8) is inserted into the upper telescopic tube (7).

2. A lifting mechanism for a working ladder according to claim 1, characterized in that: The operating rod assembly (1) comprises an operating handle (2), a lower lifting assembly (3), a bearing seat (4), and an upper lifting assembly (5); the lower lifting assembly (3) is inserted into the bearing seats (4) on both sides and is installed on the ladder frame with screws; the operating handle (2) is connected to the outer side of the lower lifting assembly (3) by screws; and the upper lifting assembly (5) is connected to the lower lifting assembly (3) by screws.

3. A lifting mechanism for a working ladder according to claim 1, characterized in that: The balancing assembly (9) comprises a front balancing pipe (10), a rear balancing pipe (11) and a movable step assembly (12), wherein the movable step assembly (12) is respectively connected to the front balancing pipe (10) and the rear balancing pipe (11) by screws; the lifting upper assembly (5) is connected to the front balancing pipe (10) by screws, the upper end of the balancing assembly (9) is connected to the platform by screws, the lower end of the balancing assembly (9) is connected to a tension spring (15), and the other end of the tension spring (15) is connected to the ladder frame B.

4. A lifting mechanism for a working ladder according to claim 3, characterized in that: The movable step assembly (12) is composed of a step plate (13) and a movable connecting plate (14), and the step plate (13) is welded to the inner side of the movable connecting plate (14).

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