Liftable trundle

Abstract

The utility model discloses a liftable caster, relates to the technical field of casters, and aims to solve the problems that most mechanical casters in the prior art cannot be subjected to stepless height adjustment according to production requirements, cannot meet different working conditions in height use, are poor in stability after height adjustment, and are not convenient and stable enough to use. A first supporting frame is fixedly connected to the lower portion of the lower plate, a second supporting frame is rotatably connected to one end of the first supporting frame, connectors are rotatably connected to the end, away from the second supporting frame, of the first supporting frame and the middle position of the second supporting frame, and an oil tank is fixedly connected between the two connectors; and an oil way adapter is fixedly installed above the lower plate, the oil way adapter is connected with the oil tank through an oil pipe, a first double-thread cylindrical rod is rotationally connected to the joint of the first supporting frame and the second supporting frame, and limiting nuts are installed at the two ends of the first double-thread cylindrical rod correspondingly.

Description

Technical Field

[0001] This utility model relates to the field of caster technology, specifically to height-adjustable casters. Background Technology

[0002] Casters are a general term that includes swivel casters, fixed casters, and swivel casters with brakes. Swivel casters, also known as universal wheels, allow 360-degree rotation; fixed casters, also called directional casters, have no rotating mechanism and cannot turn. Usually, the two types are used together; for example, a handcart typically has two fixed casters at the front and two swivel casters near the push handle at the back.

[0003] Most existing mechanical casters cannot be steplessly adjusted in height according to production needs, which cannot meet the needs of different working conditions. Furthermore, the stability after height adjustment is poor, making them inconvenient and unstable to use. Therefore, there is an urgent need in the market to develop height-adjustable casters to help people solve these problems. Utility Model Content

[0004] The purpose of this utility model is to provide height-adjustable casters to solve the problems mentioned in the background art, such as that most mechanical casters cannot be steplessly adjusted in height according to production needs, cannot meet different working conditions in terms of height, and have poor stability after height adjustment, making them inconvenient and unstable to use.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a height-adjustable caster, comprising an upper plate and a lower plate, wherein a first support frame is fixedly connected to the lower part of the lower plate, a second support frame is rotatably connected to one end of the first support frame, and a connector is rotatably connected to both the end of the first support frame away from the second support frame and the center position of the second support frame, an oil tank is fixedly connected between the two connectors, and an oil circuit adapter is fixedly installed on the upper part of the lower plate, the oil circuit adapter being connected to the oil tank via an oil pipe.

[0006] The above technical solution uses a first support frame and a second support frame to support the upper and lower plates. The ends of the first and second support frames are rotatably connected, and the height of the casters can be adjusted by rotating them. A telescopic oil tank is installed between the first and second support frames, using hydraulic oil to drive the oil tank to extend and retract, thereby adjusting the opening and closing angle of the first and second support frames and realizing the adjustment of the caster height. During use, the characteristics of the oil tank can provide stronger support, so that the casters still have good stability and support after height adjustment. Moreover, the oil tank can achieve stepless adjustment, so the casters can be adjusted to any angle to meet the needs of different working conditions and improve the convenience of use.

[0007] In a preferred embodiment, the present invention can be further configured as follows: a first double-threaded cylindrical rod is rotatably connected at the connection between the first support frame and the second support frame, and limit nuts are installed at both ends of the first double-threaded cylindrical rod; a steel-core polyurethane wheel is rotatably connected at one end of the second support frame; a second double-threaded cylindrical rod is rotatably connected at the connection between the steel-core polyurethane wheel and the second support frame, and limit nuts are installed at both ends of the second double-threaded cylindrical rod.

[0008] The above technical solution uses a double-threaded cylindrical rod to connect the rotating parts, so that the force of the rotating parts is applied to the double-threaded cylindrical rod. The strength of the double-threaded cylindrical rod will be lower than that of the support frame, making it easier to disassemble and replace vulnerable parts, and the structural materials are more cost-effective.

[0009] In a preferred embodiment, the present invention can be further configured as follows: a second bearing is provided between the upper plate and the lower plate; a tightening nut is provided on the upper plate; a first bearing is provided between the tightening nut and the upper plate; a bearing sleeve is installed between the second bearing and the first bearing; and the tightening nut is threadedly connected to the bearing sleeve.

[0010] By using the above technical solution and the arrangement of the first and second bearings, the upper plate can rotate. The upper plate is used to connect the equipment, thereby achieving the function of a caster wheel.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model uses a first support frame and a second support frame to support the upper and lower plates. The ends of the first and second support frames are rotatably connected, and the height of the casters can be adjusted by rotating them. A telescopic oil tank is installed between the first and second support frames. Hydraulic oil is used to drive the oil tank to extend and retract, thereby adjusting the opening and closing angle of the first and second support frames and realizing the adjustment of the caster height. During use, the characteristics of the oil tank can provide stronger support force, so that the casters still have good stability and support force after the height is adjusted. Moreover, the oil tank can achieve stepless adjustment, so the casters can be adjusted to any angle to meet the needs of different working conditions and improve the convenience of use.

[0013] 2. This utility model uses a double-threaded cylindrical rod to connect the rotating parts, so that the force on the rotating parts is applied to the double-threaded cylindrical rod. The strength of the double-threaded cylindrical rod will be lower than that of the support frame, making it easy to disassemble and replace vulnerable parts, and the structural materials are more cost-effective. Attached Figure Description

[0014] Figure 1 This is an overall schematic diagram of the height-adjustable casters of this utility model;

[0015] Figure 2 This is a front view of the height-adjustable caster of this utility model;

[0016] Figure 3 This is a side sectional view of the height-adjustable casters of this utility model.

[0017] In the diagram: 1. Upper plate; 2. Lower plate; 3. First support frame; 4. Second support frame; 5. Oil tank; 6. Steel core polyurethane wheel; 7. Oil circuit adapter; 8. Bearing sleeve; 9. First bearing; 10. Tightening nut; 11. Second bearing; 12. First double-threaded cylindrical rod; 13. Second double-threaded cylindrical rod. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" 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 a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0021] Please see Figure 1 and Figure 3 An embodiment of this utility model provides: a height-adjustable caster, including an upper plate 1 and a lower plate 2. A first support frame 3 is fixedly connected to the lower part of the lower plate 2. A second support frame 4 is rotatably connected to one end of the first support frame 3. A connector is rotatably connected to both the end of the first support frame 3 away from the second support frame 4 and the middle position of the second support frame 4. An oil tank 5 is fixedly connected between the two connectors. An oil circuit adapter 7 is fixedly installed on the upper part of the lower plate 2. The oil circuit adapter 7 is connected to the oil tank 5 through an oil pipe.

[0022] Please see Figure 1 , Figure 2 and Figure 3 A first double-threaded cylindrical rod 12 is rotatably connected at the connection between the first support frame 3 and the second support frame 4, and limit nuts are installed at both ends of the first double-threaded cylindrical rod 12.

[0023] Please see Figure 1 and Figure 2 A steel-core polyurethane wheel 6 is rotatably connected to one end of the second support frame 4. A second double-threaded cylindrical rod 13 is rotatably connected to the connection between the steel-core polyurethane wheel 6 and the second support frame 4. Limit nuts are installed at both ends of the second double-threaded cylindrical rod 13.

[0024] Please see Figure 3 A second bearing 11 is provided between the upper plate 1 and the lower plate 2. A tightening nut 10 is provided on the upper plate 1. A first bearing 9 is provided between the tightening nut 10 and the upper plate 1.

[0025] Please see Figure 3 A bearing sleeve 8 is installed between the second bearing 11 and the first bearing 9, and a nut 10 is threadedly connected to the bearing sleeve 8.

[0026] Working principle: During use, the oil pump is connected to the oil circuit adapter 7 to inject or extract hydraulic oil into the oil tank 5, thereby controlling the extension and retraction of the oil tank 5 and adjusting the opening and closing angle between the first support frame 3 and the second support frame 4 to adjust the height of the casters. The upper plate 1 is used to connect the equipment. The upper plate 1 can rotate 360 ​​degrees through the setting of the first bearing 9 and the second bearing 11, thereby realizing the function of the casters.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A liftable caster comprising an upper plate (1) and a lower plate (2), characterized in that: A first support frame (3) is fixedly connected to the lower part of the lower plate (2). A second support frame (4) is rotatably connected to one end of the first support frame (3). A connector is rotatably connected to the end of the first support frame (3) away from the second support frame (4) and the middle position of the second support frame (4). An oil tank (5) is fixedly connected between the two connectors. An oil circuit adapter (7) is fixedly installed on the upper part of the lower plate (2). The oil circuit adapter (7) is connected to the oil tank (5) through an oil pipe.

2. The lift wheel of claim 1, wherein: A first double-threaded cylindrical rod (12) is rotatably connected at the connection between the first support frame (3) and the second support frame (4), and limit nuts are installed at both ends of the first double-threaded cylindrical rod (12).

3. The lift wheel of claim 1, wherein: A steel-core polyurethane wheel (6) is rotatably connected to one end of the second support frame (4). A second double-threaded cylindrical rod (13) is rotatably connected to the connection between the steel-core polyurethane wheel (6) and the second support frame (4). Limit nuts are installed at both ends of the second double-threaded cylindrical rod (13).

4. The lift wheel of claim 1, wherein: A second bearing (11) is provided between the upper plate (1) and the lower plate (2), a tightening nut (10) is provided on the upper plate (1), and a first bearing (9) is provided between the tightening nut (10) and the upper plate (1).

5. The height-adjustable caster according to claim 4, characterized in that: A bearing sleeve (8) is installed between the second bearing (11) and the first bearing (9), and the tightening nut (10) is threadedly connected to the bearing sleeve (8).

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