A convenient opening type ladder door assembly

Abstract

The utility model discloses a convenient opening type ladder door assembly, be applied to the rear beam of frame, the rear beam of frame is equipped with the ladder entrance of convenient ladder access, and the outside of ladder entrance is installed the ladder door of opening and closing. The support plate is fixed outside the rear beam of frame, is located the left and right sides of ladder entrance, and the fixed jack is symmetrically equipped on it, and the hinged lug is also fixed outside the rear beam of frame, and the inside lower part of ladder door is fixed with the door body lug of rotation connection with above-mentioned hinged lug, the inside upper part of ladder door is installed with the locking structure, and the extension end of locking structure can be adapted to insert and mount to the fixed jack in corresponding side support plate. The utility model discloses simple structure, reasonable spatial layout can realize only through single hand operation, and the setting of horizontal locking structure can avoid vibration and fall off in the process of vehicle driving, effectively avoid the accidental opening of ladder door, improve the safety factor, and the locking structure is in the inside, effectively avoid environmental erosion and wear and tear, prolong its life.

Description

Technical Field

[0001] This utility model relates to the field of vehicle processing technology, specifically to a convenient opening ladder door assembly. Background Technology

[0002] To facilitate loading and unloading, semi-trailers used for vehicle transport often have a ladder structure at their rear end. Existing ladder structures are mostly folding, hydraulically retractable, or retractable. The retractable type slides and retracts inside the rear end of the chassis and is equipped with a corresponding ladder door for opening and closing. Current ladder door structures typically have their locking devices mounted on the chassis, often using a vertically oriented pin structure. An extension plate is also installed on the ladder door for connection and fixation. These pin structures are usually located on both sides of the door, requiring simultaneous opening, resulting in a large span and complex operation. Furthermore, the vertically oriented pins are prone to loosening and falling off during vehicle movement, leading to accidental opening of the ladder door and potential safety accidents. Additionally, the exposed locking device is susceptible to corrosion and wear from the environment, affecting its lifespan, making reliable fixation difficult, and subsequent maintenance and replacement cumbersome. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the existing background technology and provide a convenient opening ladder door assembly.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a convenient opening ladder door assembly is applied to the rear beam of a vehicle frame. The rear beam of the vehicle frame has a ladder opening for easy access, and a ladder door that can be opened and closed is installed on the outer side of the ladder opening. A support plate is fixedly installed on the outer wall of the rear beam of the vehicle frame, located on the left and right sides of the ladder opening, and symmetrically provided with fixing holes. A hinged lug is fixedly installed on the outer wall of the rear beam of the vehicle frame, located below the ladder opening. A door lug adapted to the hinged lug is fixedly installed on the lower part of the side of the ladder door facing the rear beam of the vehicle frame, and the two are rotatably connected. A locking structure is installed on the upper part of the side of the ladder door facing the rear beam of the vehicle frame, and the protruding end of the locking structure can be fitted into the fixing hole on the corresponding side support plate.

[0005] By installing a locking structure above the ladder door, the ladder door can be opened and closed with one hand, reducing the difficulty of operation and improving the safety factor.

[0006] Furthermore, the locking structure includes an upper horizontal plate and two opposing pins. The upper horizontal plate is fixedly installed on the ladder door, and both ends of the upper horizontal plate are fixedly provided with bent plates, each of which has a rod through hole. A fixing plate is fixedly installed at the bottom of the upper horizontal plate, and the fixing plate also has a rod through hole. The two pins are slidably installed in the rod through holes of the fixing plate and the bent plate on the corresponding side, respectively. A lever hole is provided at the end of the pin near the center of the upper horizontal plate, and a lever is installed inside the hole. Correspondingly, a lever groove is provided on the upper horizontal plate, and the lever extends out from the corresponding lever groove and can slide along its length.

[0007] Furthermore, a sliding sleeve is fixedly installed on both the bending plate and the fixing plate, with its central axis aligned with the central axis of the rod through hole, and the pin rod is slidably installed inside the sliding sleeve.

[0008] Furthermore, each pin is fitted with a spring; each pin is fitted with a limiting pad, with one end of the spring abutting against the limiting pad and the other end abutting against the fixing plate.

[0009] The pin rod is provided with a pin hole, and a cotter pin for limiting and fixing the limiting pad is inserted inside.

[0010] Furthermore, when the ladder door is in the closed state, the central axis of the aforementioned rod through hole coincides with the central axis of the aforementioned fixed insertion hole on the support plate.

[0011] Furthermore, the lever slot is also provided with a defined side slot that is perpendicular to and connected to it, located at one end away from the center of the upper horizontal plate.

[0012] Furthermore, the width of the ladder door is greater than the spacing between the support plates installed on the left and right sides of the corresponding ladder opening; the lower end of the support plate near the corner of the ladder door is rounded.

[0013] Furthermore, there are two hinged lugs, which are arranged at intervals relative to each other; each hinged lug is arranged in a sandwich structure, and the door body lugs on the inner side of the ladder door are respectively installed in the sandwich structure of the corresponding hinged lugs and are connected by a rotating shaft.

[0014] Furthermore, a ladder stop plate parallel to the ladder door is fixed to the inner side of the fixing plate. It is made of high-strength, corrosion-resistant material, and a rubber pad is added to the side facing the ladder opening.

[0015] Furthermore, reinforcing ribs are added to the outer wall of the support plate.

[0016] Compared with the prior art, the present invention has the following advantages: the present invention has a simple structure, reasonable spatial layout, and is easy to operate, and can be operated with only one hand; the setting of the lateral locking structure can prevent vibration and detachment during vehicle operation, effectively prevent the ladder door from being opened accidentally, and improve the safety factor; at the same time, the locking structure is located on the inside, which effectively prevents environmental erosion and wear, and extends its service life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the rear beam structure of the vehicle frame in this utility model; Figure 3 This is a schematic diagram of the inner structure of the ladder door in this utility model; Figure 4 This is a longitudinal sectional view of the ladder door of this utility model along the central axis of the pin rod; Figure 5 This is a schematic diagram of the structure of the insertion pin in this utility model; Figure 6 This is a schematic diagram of another embodiment of the lever groove provided on the upper horizontal plate in this utility model; In the diagram: 1. Rear beam of the frame, 2. Ladder opening, 3. Ladder door, 4. Upper cross plate, 5. Pin rod, 6. Fixing plate, 7. Spring, 8. Limiting pad, 9. Cotter pin, 10. Toggle rod, 11. Support plate, 12. Fixing insertion hole, 13. Hinge lug, 14. Rounded chamfer, 31. Door lug, 41. Bending plate, 42. Rod through hole, 43. Toggle rod groove, 44. Sliding sleeve, 51. Toggle hole, 52. Pin hole. Detailed Implementation

[0018] It should be noted that in the description of this utility model, terms such as "upper", "lower", "left", "right", "lateral", "coaxial", "center", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are only used to facilitate the description of the structural relationship between the components in this utility model and do not specifically mean that any component in this utility model must have a specific orientation, be constructed and operated in a specific orientation, or be construed as a limitation on this utility model.

[0019] Furthermore, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings: like Figures 1 to 4 As shown, a convenient-opening ladder door assembly is applied to the rear beam 1 of a trailer frame. The rear beam 1 has a ladder opening 2 for easy access via a ladder. Support plates 11 are also fixedly installed on the outer wall of the rear beam 1, respectively located on the left and right ends of the ladder opening 2, both perpendicular to the rear beam 1. Each support plate 11 has a fixing hole 12 at the same height, with their central axes coinciding. Several reinforcing ribs are also welded and fixed to the outer wall of the support plate 11 to improve the overall strength of the support plate 11.

[0021] Each of the aforementioned ladder openings 2 is provided with an opening and closing ladder door 3 on its outer side. Two door lugs 31 are welded and fixed to the bottom of the ladder door 3 on the side facing the rear beam 1 of the frame. They are arranged at intervals and have pivot holes. Correspondingly, two hinged lugs 13 are fixedly installed on the outer wall of the rear beam 1 of the frame, arranged at intervals, located below the ladder openings 2. Each hinged lug 13 has a double-layer structure and is also provided with pivot holes. The door lugs 31 are inserted into the interlayer of the corresponding hinged lugs 13. The door lugs 31 and the hinged lugs 13 are rotatably connected by a pivot passing through the pivot hole, so that the ladder door 3 can rotate around the pivot to open or close.

[0022] The upper part of the ladder door 3 facing the rear beam 1 of the frame is provided with a locking structure, and its overall structure is symmetrically arranged with its longitudinal center line. The locking structure includes an upper horizontal plate 4 and two oppositely arranged pin rods 5. The upper horizontal plate 4 is welded and fixed to the inner wall of the ladder door 3, perpendicular to it. Both ends of the upper horizontal plate 4 are bent downward to form bent plates 41. The two bent plates 41 are respectively provided with coaxial and opposite rod through holes 42. A sliding sleeve 44 is fixedly installed on the inner wall of each bent plate 41, and its central axis is aligned with the rod through hole 42. The central axes coincide; the bottom of the upper horizontal plate 4 is also fixedly installed with two fixed plates 6, which are arranged at relatively intervals. The end of the plate 6 near the rear beam 1 of the frame is connected by a ladder abutment plate. They are integrally formed and their cross-section is a horizontal "bracket ([)" shape. The ladder abutment plate is also parallel to the ladder door. The two fixed plates 6 are also provided with rod through holes, which coincide with the central axis of the rod through hole 42 on the bent plate 41. The outer side wall of the fixed plate 6 is also fixedly installed with a sliding sleeve 44, whose central axis coincides with the central axis of the rod through hole 42. The two pin rods 5 are respectively inserted into the rod through holes 42 on the fixed plate 6 and the bent plate 41 on the corresponding side, and are slidably installed in the sliding sleeve 44, which can effectively ensure the stability of their left and right sliding; combined with Figure 5As shown, the pin 5 has a push hole 51 at one end near the center of the upper horizontal plate 4, and an internal thread on its inner side wall, through which a push rod 10 perpendicular to it is connected; the middle position of the pin 5 also has a pin hole 52 that penetrates its diameter, and a cotter pin 9 is installed inside it; a limiting pad 8 is coaxially mounted on the pin 5, and the cotter pin 9 is used to limit and fix it, which facilitates the installation and disassembly of the pin 5; and a spring 7 is also coaxially mounted on the pin 5, one end of the spring 7 abuts against the sliding sleeve on the fixing plate 6, and the other end abuts against the limiting pad 8, using its tension to hold the limiting pad 8, thereby driving the pin 5 to always extend outward from the bending plate 41. The upper horizontal plate 4 also has two lever slots 43 along its length. The levers 10 on the two pins 5 extend outward from the upper horizontal plate 4 through the lever slots 43 on the corresponding sides and can slide along its length. When the ladder door 3 is in the closed state, the central axis of the fixing hole 12 on the support plate 11 coincides with the central axis of the pin 5. The pin 5 pops outward under the action of its spring 7, and its outer end is inserted into the fixing hole 12 on the corresponding side, realizing the locking and closing of the ladder door 3. A further optimized technical solution, combined with Figure 6 As shown, the upper horizontal plate 4 has a lever groove 43 with a limiting side groove that is perpendicular to and connected to it. The limiting side groove is located at the end of the lever groove 43 away from the center of the upper horizontal plate 4 and is arranged in an "L" shape. When the ladder door 3 is in the closed state, the lever 10 can rotate into the limiting side groove to limit the pin 5, preventing it from being accidentally retracted by external force and avoiding the ladder door 3 from being opened accidentally.

[0023] Furthermore, the left and right width of the aforementioned ladder door 3 is greater than the interval between the two support plates 11 on both sides of the aforementioned ladder opening 2. When the ladder door 3 is closed, it can block and limit its movement, allowing the pin rod 5 to pop out and be inserted into the corresponding fixed insertion hole 12. The bottom of the support plate 11 near the corner of the ladder door 3 is rounded with a chamfer 14, and the center of the chamfer is located on the axis of the aforementioned rotating shaft, preventing obstruction when the ladder door 3 is opened and facilitating the rotation and opening of the ladder door 3.

[0024] Furthermore, the aforementioned ladder stop plate is made of high-strength, corrosion-resistant material, and a rubber pad can be added to the side facing the ladder opening 2 to prevent collision and wear of the ladder.

[0025] When the ladder door 2 needs to be opened, the two levers 10 can be squeezed with one hand to pull out the two pins 5 from their corresponding fixed holes 12, thus opening the ladder door 2.

[0026] The technical solutions not described or mentioned in detail in the above embodiments can be achieved by adopting or referencing relevant technical features in the existing technology.

[0027] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A convenient-opening ladder door assembly, applied to the rear beam of a vehicle frame, characterized in that: The rear beam of the vehicle frame is provided with a ladder opening for easy access, and a ladder door that can be opened and closed is installed on the outside of the ladder opening. Support plates are fixedly installed on the outer side wall of the rear beam of the frame, located on the left and right sides of the ladder opening, respectively, with symmetrical fixing holes on them; hinged lugs are fixedly installed on the outer side wall of the rear beam of the frame, located below the ladder opening, and door lugs adapted to the hinged lugs are fixedly installed on the lower part of the side of the ladder door facing the rear beam of the frame, and the two are rotatably connected; a locking structure is installed on the upper part of the side of the ladder door facing the rear beam of the frame, and the protruding end of the locking structure can be fitted into the fixing holes on the corresponding side support plate.

2. The convenient opening ladder door assembly according to claim 1, characterized in that: The locking structure includes an upper horizontal plate and two opposing pins. The upper horizontal plate is fixedly installed on the ladder door, and both ends of the upper horizontal plate are fixedly provided with bent plates, each of which has a rod through hole. A fixing plate is fixedly installed at the bottom of the upper horizontal plate, and the fixing plate also has a rod through hole. The two pins are slidably installed in the rod through holes of the fixing plate and the bent plate on the corresponding side, respectively. A lever hole is provided at the end of the pin near the center of the upper horizontal plate, and a lever is installed inside the hole. Correspondingly, a lever groove is provided on the upper horizontal plate, and the lever extends out from the corresponding lever groove and can slide along its length.

3. The convenient opening ladder door assembly according to claim 2, characterized in that: A sliding sleeve is fixedly installed on both the bending plate and the fixing plate, and its central axis is consistent with the central axis of the rod through hole. The pin rod is slidably installed in the sliding sleeve.

4. The convenient opening ladder door assembly according to claim 2, characterized in that: Each pin is fitted with a spring; each pin is fitted with a limit pad, one end of the spring rests against the limit pad, and the other end rests against the fixing plate; The pin rod is provided with a pin hole, and a cotter pin for limiting and fixing the limiting pad is inserted inside.

5. The convenient opening ladder door assembly according to claim 2, characterized in that: When the ladder door is closed, the central axis of the above-mentioned rod through hole coincides with the central axis of the fixed insertion hole on the above-mentioned support plate.

6. The convenient opening ladder door assembly according to claim 2, characterized in that: The lever slot is also provided with a limiting side slot that is perpendicular to and connected to it, located at one end away from the center of the upper horizontal plate.

7. The convenient opening ladder door assembly according to claim 1, characterized in that: The width of the ladder door is greater than the spacing between the support plates installed on the left and right sides of the corresponding ladder opening; the lower end of the support plate near the corner of the ladder door is rounded.

8. The convenient opening ladder door assembly according to claim 1, characterized in that: The hinged lugs are provided in two pairs, which are arranged at intervals relative to each other; each hinged lug is arranged in a sandwich structure, and the door body lugs on the inner side of the ladder door are respectively installed in the sandwich structure of the corresponding hinged lugs and are connected by a rotating shaft.

9. A convenient opening ladder door assembly according to claim 2, characterized in that: The inner side of the fixing plate is fixed with a ladder stop plate parallel to the ladder door, which is made of high-strength and corrosion-resistant material, and a rubber pad is added to the side facing the ladder opening.

10. The convenient opening ladder door assembly according to claim 1, characterized in that: The outer wall of the support plate is reinforced with ribs.

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