Scissor fork type lifting tray with self-locking protection function

Abstract

The utility model relates to the technical field of lifting trays, in particular to a scissor-type lifting tray with a self-locking protection function, which comprises a supporting bottom plate, a lifting top plate and a scissor-type connecting rod assembly arranged between the supporting bottom plate and the lifting top plate, a self-locking assembly is arranged on the scissor-type connecting rod assembly, and the self-locking assembly comprises a screw rod. One end of the lead screw is rotationally connected with a first connecting block, the other end of the lead screw is connected with a second connecting block through threads, a U-shaped plate is fixed to one side of the first connecting block, a gear is fixed to one end of the lead screw, and a rocker is rotationally connected to the lead screw. Self-locking protection in the lifting process is achieved through interaction of the lead screw, the clamping jaw, the gear, the torsion spring and other components. When the lifting tray reaches the designated height, the self-locking assembly can automatically lock the lifting tray, and the height change of the lifting tray caused by mistaken rotation of the lead screw is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting trays, in particular to a scissor - type lifting tray with self - locking protection. Background Technique

[0002] For existing lifting platforms, generally, a lead screw is used for up - and - down driving. If the lead screw is accidentally rotated, the lifting platform will move up and down. Especially for children, when the height of the lifting platform moves, it needs to be readjusted when used again.

[0003] Therefore, we propose a scissor - type lifting tray with self - locking protection to solve the above problems. Content of the Utility Model

[0004] The main purpose of the utility model is to provide a scissor - type lifting tray with self - locking protection, which can effectively solve the problems in the background technique.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is: a scissor - type lifting tray with self - locking protection, including a support bottom plate, a lifting top plate, and a scissor - type link assembly installed between the support bottom plate and the lifting top plate. A self - locking assembly is installed on the scissor - type link assembly. The self - locking assembly includes a lead screw. One end of the lead screw is rotatably connected to a first connection block, and the other end of the lead screw is threadedly connected to a second connection block. A U - shaped plate is fixed to one side of the first connection block. A gear is fixed to one end of the lead screw. A rocker is rotatably connected to the lead screw, and both the gear and the rocker are arranged inside the U - shaped plate. A claw is connected to the inside of the rocker through a first pin shaft, and the claw is in clamping cooperation with the gear. A baffle is provided on the side wall of the claw. A support rod is fixed to the bottom of the claw. A V - shaped reset seat is hinged to the inside of the U - shaped plate through a second pin shaft. A torsion spring is sleeved on the second pin shaft, and both ends of the torsion spring are clamped with the U - shaped plate and the V - shaped reset seat respectively. The end of the support rod contacts the V - shaped reset seat.

[0006] Preferably, the scissor - type link assembly includes a first link rotatably connected to one end of the lifting top plate through a hinge shaft. The middle of the first link is rotatably connected to a second link through a hinge shaft. Chute grooves are provided on the side walls of both the support bottom plate and the lifting top plate. The end of the second link is slidably connected to the chute groove. The ends of the first link and the second link are respectively hinged to a third link and a fourth link through hinge shafts. The middle parts of the third link and the fourth link are hinged through a hinge shaft. The end of the third link is hinged to the support bottom plate through a hinge shaft. The end of the fourth link is slidably connected to the chute groove on the support bottom plate. The first connection block is installed on the hinge shaft at the joint of the first link and the third link. The second connection block is installed on the hinge shaft at the joint of the second link and the fourth link.

[0007] Preferably, a handwheel is fixed to the end of the lead screw.

[0008] Preferably, a handle is provided on the handwheel.

[0009] Preferably, a blocking pin is fixed inside the U-shaped plate, and the blocking pin cooperates with the V-shaped reset seat.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] Through the interaction of components such as the lead screw, the claw, the gear, and the torsion spring, self-locking protection during the lifting process is achieved.

[0012] When the lifting tray reaches the specified height, the self-locking assembly can automatically lock to prevent the height change of the lifting tray caused by accidentally rotating the lead screw. Description of the Drawings

[0013] Figure 1 is the front view of a scissor-type lifting tray with self-locking protection according to the utility model;

[0014] Figure 2 is the exploded view of a scissor-type lifting tray with self-locking protection according to the utility model;

[0015] Figure 3 is the structural schematic diagram of the self-locking assembly of a scissor-type lifting tray with self-locking protection according to the utility model;

[0016] Figure 4 is the exploded view of the self-locking assembly of a scissor-type lifting tray with self-locking protection according to the utility model.

[0017] In the figure: 1, support bottom plate; 2, lifting top plate; 3, lead screw; 4, first connecting block; 5, second connecting block; 6, U-shaped plate; 7, gear; 8, rocker; 9, first pin shaft; 10, claw; 11, baffle; 12, support rod; 13, second pin shaft; 14, V-shaped reset seat; 15, torsion spring; 16, hinge shaft; 17, first connecting rod; 18, second connecting rod; 19, chute; 20, third connecting rod; 21, fourth connecting rod; 22, handwheel; 23, handle; 24, blocking pin. Detailed Embodiments

[0018] In order to make the technical means, creative features, achieved purposes and effects of the utility model easy to understand, the utility model will be further described below in conjunction with specific embodiments.

[0019] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0020] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0021] Please refer to Figures 1-4 , the present utility model provides a technical solution: a scissor lift tray with self-locking protection, which includes a support bottom plate 1, a lifting top plate 2, and a scissor link assembly installed between the two. A self-locking assembly is particularly assembled on this scissor link assembly. The core component of this self-locking assembly is a lead screw 3, one end of which is connected to a first connection block 4 in a rotational connection manner, and the other end is connected to a second connection block 5 in a threaded connection manner. It should be noted that a U-shaped plate 6 is fixed on one side of the first connection block 4, and a gear 7 is fixed at one end of the lead screw 3. In addition, a rocker 8 is rotatably connected to the lead screw 3, and both the gear 7 and the rocker 8 are cleverly arranged inside the U-shaped plate 6. The inner side of the rocker 8 is connected to a claw 10 through a first pin shaft 9, and a clamping fit is achieved between the claw 10 and the gear 7. A baffle 11 is provided on the side wall of the claw 10, and a support rod 12 is fixed at the bottom. A V-shaped reset seat 14 is hinged inside the U-shaped plate 6 through a second pin shaft 13, and a torsion spring 15 is sleeved on the second pin shaft 13, and its two ends are respectively clamped with the U-shaped plate 6 and the V-shaped reset seat 14. The end of the support rod 12 is in contact with the V-shaped reset seat 14, forming a stable structure.

[0022] When it is necessary to adjust the height of the lifting tray, simply press the rocker 8 gently. At this time, the support rod 12 will squeeze the V-shaped reset seat 14, causing it to rotate along a specific trajectory. Meanwhile, the torsion spring 15 starts to store energy to prepare for the subsequent reset action. As the V-shaped reset seat 14 rotates, the claw 10 will separate from the gear 7, thus releasing the limiting restraint on the gear 7. At this time, the lead screw 3 can be rotated by driving the handwheel 22, and then the distance between the second connecting block 5 and the first connecting block 4 can be precisely adjusted to achieve the smooth lifting of the scissor-link assembly. Release the rocker 8, and the torsion spring 15 releases its elastic potential energy, driving the V-shaped reset seat 14 to drive the claw 10 to reset and latch the claw 10. At this time, the handwheel 22 cannot rotate, thus realizing self-locking.

[0023] In the design of the scissor-link assembly, we adopted the first connecting rod 17 rotatably connected to one end of the lifting top plate 2 through the hinge shaft 16, and the middle part of which is further rotatably connected with the second connecting rod 18 through the hinge shaft 16. Slide grooves 19 are provided on the side walls of the support bottom plate 1 and the lifting top plate 2, and the end of the second connecting rod 18 is slidably connected to these slide grooves 19, ensuring the stability and flexibility of the link assembly. The ends of the first connecting rod 17 and the second connecting rod 18 are respectively hinged with the third connecting rod 20 and the fourth connecting rod 21 through the hinge shaft 16, and the middle parts of the third connecting rod 20 and the fourth connecting rod 21 are also connected through the hinge shaft 16. The end of the third connecting rod 20 is connected to the support bottom plate 1 through the hinge shaft 16, while the end of the fourth connecting rod 21 is slidably connected to the slide groove 19 on the support bottom plate 1. Such a design makes the scissor-link assembly more stable and smooth during the lifting process.

[0024] To further optimize the user experience, we fixed the handwheel 22 at the end of the lead screw 3 and particularly set a handle 23 on the handwheel 22 to facilitate the user to easily rotate the lead screw 3 for adjustment. At the same time, a blocking pin 24 is fixed inside the U-shaped plate 6, which cooperates with the V-shaped reset seat 14 to precisely limit and control the rotation stroke of the V-shaped reset seat 14, ensuring the reliability and stability of the entire self-locking assembly.

[0025] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art of this industry should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A scissor - type lifting tray with self - locking protection, comprising a support bottom plate (1), a lifting top plate (2), and a scissor - type link assembly installed between the support bottom plate (1) and the lifting top plate (2), characterized in that: A self-locking component is installed on the scissor link assembly. The self-locking component includes a lead screw (3). One end of the lead screw (3) is rotatably connected to a first connecting block (4). The other end of the lead screw (3) is threadedly connected to a second connecting block (5). One side of the first connecting block (4) is fixed with a U-shaped plate (6). One end of the lead screw (3) is fixed with a gear (7). A rocker (8) is rotatably connected to the lead screw (3). Both the gear (7) and the rocker (8) are arranged inside the U-shaped plate (6). The inside of the rocker (8) is connected to a claw (10) through a first pin shaft (9). The claw (10) is in clamping fit with the gear (7). A baffle (11) is arranged on the side wall of the claw (10). A support rod (12) is fixed at the bottom of the claw (10). A V-shaped reset seat (14) is hinged inside the U-shaped plate (6) through a second pin shaft (13). A torsion spring (15) is sleeved on the second pin shaft (13). Both ends of the torsion spring (15) are in clamping connection with the U-shaped plate (6) and the V-shaped reset seat (14) respectively. The end of the support rod (12) contacts the V-shaped reset seat (14).

2. The scissor lift tray with self-locking protection according to claim 1, wherein The scissor link assembly includes a first link (17) rotatably connected to one end of the lifting top plate (2) through a hinge shaft (16). The middle of the first link (17) is rotatably connected to a second link (18) through a hinge shaft (16). Chute grooves (19) are arranged on the side walls of the support bottom plate (1) and the lifting top plate (2). The end of the second link (18) is slidably connected to the chute groove (19). The ends of the first link (17) and the second link (18) are respectively hinged to a third link (20) and a fourth link (21) through a hinge shaft (16). The middle of the third link (20) and the fourth link (21) are hinged through a hinge shaft (16). The end of the third link (20) is hinged to the support bottom plate (1) through a hinge shaft (16). The end of the fourth link (21) is slidably connected to the chute groove (19) on the support bottom plate (1). The first connecting block (4) is installed on the hinge shaft (16) at the joint of the first link (17) and the third link (20). The second connecting block (5) is installed on the hinge shaft (16) at the joint of the second link (18) and the fourth link (21).

3. A scissor lift tray with self-locking protection according to claim 1, characterized in that, A hand wheel (22) is fixed at the end of the lead screw (3).

4. The scissor lift tray with self-locking protection according to claim 3, characterized in that, A handle (23) is arranged on the hand wheel (22).

5. A scissor lift tray with self-locking protection according to claim 1, characterized in that, A blocking pin (24) is fixed inside the U-shaped plate (6). The blocking pin (24) is matched with the V-shaped reset seat (14).

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