Height adjustment stand for a lifting chair

Abstract

The utility model provides height adjusting frame for lift chair relates to mechanical equipment technical field, in this device, front wheel arm and rear wheel arm are sheared formula hinged, rear wheel arm is hinged with platform body, platform balance linkage link is hinged with front wheel arm, first platform balance link is hinged with rear wheel arm, second platform balance link is hinged with platform body, any one in the movable part and fixed part of driving part is movably assembled with platform body, and the other is hinged with front wheel arm, the hinge point of second platform balance link and platform body, movable assembling place of driving part and platform body all are located on the same side of rear wheel arm and platform body hinge point. The device is used for low space mobile lifting operation, can reduce platform floor space, and is convenient to park and transport.

Description

Technical Field

[0001] This utility model relates to the field of mechanical equipment technology, and in particular to a height adjustment frame for a height-adjustable chair. Background Technology

[0002] Currently, the conventional method for lifting-assisted mobile chairs is to use an X-shaped cross arm combined with a sliding rail to achieve the lifting purpose. This design adjusts the platform height by opening and closing the cross arm. However, this type of architecture has significant drawbacks: on the one hand, the combination of the cross arm and the sliding rail results in a bulky overall structure, increasing the weight of the equipment and manufacturing costs, and reducing operational flexibility; on the other hand, the floor space occupied increases significantly after the base is unfolded during the lifting process, especially in low and narrow working spaces, which not only limits the range of movement of the equipment, but also causes inconvenience for parking and transportation, making it difficult to meet the requirements of modern efficient operations for equipment compactness and portability. Utility Model Content

[0003] The purpose of this utility model is to provide a height adjustment frame for a height-adjustable chair to solve the technical problem of large space occupation in the prior art.

[0004] To solve the above problems, the height adjustment frame for the adjustable chair involved in this utility model adopts the following technical solution:

[0005] The height adjustment frame for a height-adjustable chair provided by this utility model includes a front wheel arm, a rear wheel arm, and a platform body. The front wheel arm and the rear wheel arm are scissor-hinged, and the rear wheel arm is hinged to the platform body. It also includes a drive component and a platform balancing mechanism. The platform balancing mechanism includes a platform balancing linkage rod, a first platform balancing rod, and a second platform balancing rod that are hinged sequentially. The platform balancing linkage rod is hinged to the front wheel arm, the first platform balancing rod is hinged to the rear wheel arm, and the second platform balancing rod is hinged to the platform body. Either the movable part or the fixed part of the drive component is movably assembled with the platform body, and the other is hinged to the front wheel arm. The hinge point between the second platform balancing rod and the platform body, and the movable assembly point between the drive component and the platform body are both located on the same side as the hinge point between the rear wheel arm and the platform body. The extension action of the drive component drives the rear wheel arm to rotate relative to the front wheel arm and fold.

[0006] Preferably, it further includes a front wheel assembly, a rear wheel assembly, and a wheel balancing mechanism. The front wheel arm is hinged to the front wheel assembly, and the rear wheel arm is hinged to the rear wheel assembly. The wheel balancing mechanism includes a first wheel balance bar, a second wheel balance bar, a third wheel balance bar, and a fourth wheel balance bar that are hinged sequentially. The first wheel balance bar is hinged to the rear wheel assembly and the second wheel balance bar, respectively. The second wheel balance bar is hinged to the rear wheel arm, and the fourth wheel balance bar is hinged to the front wheel assembly and the third wheel balance bar, respectively. The third wheel balance bar is hinged to the front wheel arm. The extension action of the drive member drives the rear wheel arm and the front wheel arm to fold, and causes the third wheel balance bar and the second wheel balance bar to fold. The second wheel balance bar rotates relative to the rear wheel arm through the first wheel balance bar, causing one side of the rear wheel assembly to move while the rear wheel arm drives the other side of the rear wheel assembly to move. The third wheel balance bar rotates relative to the front wheel arm through the fourth wheel balance bar, causing the front wheel assembly to move while the front wheel arm drives the other side of the front wheel assembly to move.

[0007] Preferably, it further includes a limiting mechanism for limiting the drive component. The limiting mechanism includes a hinged first limiting rod and a second limiting rod. The first limiting rod is hinged to the rear wheel arm, and the second limiting rod is hinged to the drive component and the second platform balance bar, respectively.

[0008] Preferably, the driving component is configured as an electric actuator, a hydraulic actuator, or a pneumatic actuator.

[0009] Preferably, the platform balance linkage rod, the first platform balance rod, and the second platform balance rod are hinged end to end in sequence. The hinge points of the platform balance linkage rod with the front wheel arm, the hinge points of the front wheel arm and the rear wheel arm, the hinge points of the first platform balance rod with the rear wheel arm, and the hinge points of the first platform balance rod with the second platform balance rod are arranged from top to bottom. The hinge points of the platform balance linkage rod with the first platform balance rod and the second platform balance rod with the platform body are located on both sides of the rear wheel arm.

[0010] Preferably, the hinge point of the second wheel stabilizer bar and the third wheel stabilizer bar is located within the triangular area enclosed by the hinge point of the front wheel arm and the rear wheel arm, the hinge point of the first wheel stabilizer bar and the rear wheel assembly, and the hinge point of the fourth wheel stabilizer bar and the front wheel assembly.

[0011] The beneficial effects of this utility model are as follows:

[0012] The height adjustment frame for a height-adjustable chair provided by this utility model includes a front wheel arm, a rear wheel arm, and a platform body. The front wheel arm and the rear wheel arm are scissor-hinged, and the rear wheel arm is hinged to the platform body. Compared with the traditional X-shaped cross arm and slide rail structure, this device also includes a drive component and a platform balancing mechanism. Through the scissor-hinged connection between the front wheel arm and the rear wheel arm, and in conjunction with the linkage folding of the platform balancing mechanism, when the drive component extends, the rear wheel arm rotates relative to the front wheel arm and folds, while simultaneously driving the platform balancing mechanism to retract synchronously. This allows the entire height adjustment frame to achieve a shape transformation during the lifting process, reducing the platform's floor space and effectively solving the space limitation problem during low-ceiling operations and transportation and storage. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below:

[0014] Figure 1 Axonometric view of the height adjustment bracket for a height-adjustable chair;

[0015] Figure 2 A front view of the height adjustment bracket for a height-adjustable chair;

[0016] Figure 3 for Figure 1 Another perspective view;

[0017] Figure 4 A schematic diagram of the components of the platform balancing mechanism;

[0018] Figure 5 This is a schematic diagram of the components of a wheel balancing mechanism.

[0019] In the diagram: 1. Front wheel arm; 2. Rear wheel arm; 3. Platform body; 4. Drive component; 5. Platform balance linkage bar; 6. First platform balance bar; 7. Second platform balance bar; 8. Front wheel assembly; 9. Rear wheel assembly; 10. First wheel balance bar; 11. Second wheel balance bar; 12. Third wheel balance bar; 13. Fourth wheel balance bar; 14. First limit bar; 15. Second limit bar. Detailed Implementation

[0020] To make the technical objectives, technical solutions, and beneficial effects of this utility model clearer, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] The height adjustment frame for a height-adjustable chair provided by this utility model, as shown in the figure, includes a front wheel arm 1, a rear wheel arm 2, a platform body 3, a drive component 4, and a platform balancing mechanism. The front wheel arm 1 and the rear wheel arm 2 are scissor-type cross-hinged. The rear wheel arm 2 is hinged to the platform body 3. The platform balancing mechanism includes a platform balancing linkage rod 5, a first platform balancing rod 6, and a second platform balancing rod 7, which are hinged sequentially. The platform balancing linkage rod 5 is hinged to the front wheel arm 1, the first platform balancing rod 6 is hinged to the rear wheel arm 2, and the second platform balancing rod 7 is hinged to the platform body 3. Either the movable part or the fixed part of the drive component 4 is movably assembled to the platform body 3, and the other is hinged to the front wheel arm 1. The hinge point between the second platform balance bar 7 and the platform body 3, and the movable assembly point between the drive component 4 and the platform body 3 are all located on the same side of the hinge point between the rear wheel arm 2 and the platform body 3. The extension action of the drive component 4 drives the rear wheel arm 2 and the front wheel arm 1 to rotate relative to each other and fold, and causes the hinge point between the rear wheel arm 2 and the front wheel arm 1 to move upward. Compared with the original technology, this reduces the horizontal space occupation. The rear wheel arm 2 pushes one side of the platform body 3 to move upward. The front wheel arm 1 drives the first platform balance bar 6 and the rear wheel arm 2 to rotate relative to each other through the platform balance linkage rod, and causes the first platform balance bar 6 and the second platform balance bar 7 to fold and lift the other side of the platform body 3 to move upward.

[0022] This device also includes a front wheel assembly 8, a rear wheel assembly 9, and a wheel balancing mechanism. The front wheel arm 1 is hinged to the front wheel assembly 8, and the rear wheel arm 2 is hinged to the rear wheel assembly 9, forming a direct linkage between the wheel assembly and the wheel arm. The wheel balancing mechanism includes a first wheel balance bar 10, a second wheel balance bar 11, a third wheel balance bar 12, and a fourth wheel balance bar 13, which are hinged sequentially. The first wheel balance bar 10 is hinged to the rear wheel assembly 9, the second wheel balance bar 11 is hinged to the rear wheel arm 2, forming a fulcrum transmission structure for the double-sided linkage of the rear wheel assembly 9, and the fourth wheel balance bar 13 is hinged to the front wheel assembly 8. The third wheel balance bar 12 is hinged to the front wheel arm 1. This forms a pivot transmission structure with dual-side linkage of the front wheel assembly 8. The extension action of the drive component 4 drives the rear wheel arm 2 and the front wheel arm 1 to fold, and causes the second wheel balance bar 11 and the third wheel balance bar 12 to fold. The second wheel balance bar 11 drives the first wheel balance bar 10 to pull the rear wheel assembly 9 and cooperates with the rear wheel arm 2 to pull the rear wheel assembly 9. The third wheel balance bar 12 drives the fourth wheel balance bar 13 to pull the front wheel assembly 8 and cooperates with the front wheel arm 1 to pull the front wheel assembly 8, thereby achieving balanced linkage between the front wheel assembly 8 and the rear wheel assembly 9 to ensure that the front and rear wheels remain balanced when the platform body 3 is raised and lowered.

[0023] The device also includes a limiting mechanism for limiting the drive member 4. The limiting mechanism includes a first limiting rod 14 and a second limiting rod 15 that are hinged at both ends. The first limiting rod 14 is hinged to the rear wheel arm 2, and the second limiting rod 15 is hinged to the drive member 4 and the second platform balance bar 7. Furthermore, the movable part of the drive member 4 is hinged to the front wheel arm 1, and the fixed part of the drive member 4 is hinged to the second limiting rod 15.

[0024] The drive component 4 is configured as an electric push rod, a hydraulic push rod, or a pneumatic push rod.

[0025] Furthermore, the platform balance linkage 5, the first platform balance rod 6, and the second platform balance rod 7 are sequentially hinged end to end. During the lifting process, the hinge points of the platform balance linkage 5 with the front wheel arm 1, the hinge points of the front wheel arm 1 and the rear wheel arm 2, the hinge points of the first platform balance rod 6 with the rear wheel arm 2, and the hinge points of the first platform balance rod 6 with the second platform balance rod 7 are arranged sequentially from top to bottom. The hinge points of the platform balance linkage 5 with the first platform balance rod 6 and the second platform balance rod 7 with the platform body 3 are located on the side of the rear wheel arm 2 away from the drive member 4 and the side closer to the drive member 4, respectively.

[0026] The hinge point between the second-wheel stabilizer bar 11 and the third-wheel stabilizer bar 12 is located within the triangular area enclosed by the hinge point between the front wheel arm 1 and the rear wheel arm 2, the hinge point between the first-wheel stabilizer bar 10 and the rear wheel assembly 9, and the hinge point between the fourth-wheel stabilizer bar 13 and the front wheel assembly 8. The hinge point between the first-platform stabilizer bar 6 and the second-platform stabilizer bar 7 is located above the hinge point between the second-wheel stabilizer bar 11 and the third-wheel stabilizer bar 12. Furthermore, the hinge points between the front wheel arm 1 and the rear wheel arm 2, and between the first-platform stabilizer bar 6 and the second-platform stabilizer bar 7, are all located between the hinge point between the front wheel arm 1 and the front wheel assembly 8, and between the rear wheel arm 2 and the rear wheel assembly 9.

[0027] Finally, it should be noted that the above embodiments are only for illustration and not for limiting the technical solutions of this utility model. Any equivalent substitutions and modifications or partial substitutions that do not depart from the spirit and scope of this utility model should be covered within the scope of protection of the claims of this utility model.

Claims

1. A height-adjustable frame for a height-adjustable chair, comprising a front wheel arm (1), a rear wheel arm (2), and a platform body (3), wherein the front wheel arm (1) and the rear wheel arm (2) are scissor-hinged, and the rear wheel arm (2) is hinged to the platform body (3), characterized in that, It also includes a drive component (4) and a platform balancing mechanism. The platform balancing mechanism includes a platform balancing linkage rod (5), a first platform balancing rod (6), and a second platform balancing rod (7) that are hinged in sequence. The platform balancing linkage rod (5) is hinged to the front wheel arm (1), the first platform balancing rod (6) is hinged to the rear wheel arm (2), and the second platform balancing rod (7) is hinged to the platform body (3). One of the moving part and the fixed part of the drive component (4) is movably assembled with the platform body (3), and the other is hinged to the front wheel arm (1). The hinge point of the second platform balancing rod (7) and the platform body (3), and the hinge point of the drive component (4) and the platform body (3) are also mentioned. The moving parts are all located on the same side of the hinge point between the rear wheel arm (2) and the platform body (3). The extension action of the drive component (4) drives the rear wheel arm (2) to rotate relative to the front wheel arm (1) and fold, and causes the hinge point between the rear wheel arm (2) and the front wheel arm (1) to move upward. The rear wheel arm (2) pushes one side of the platform body (3) to move upward. The front wheel arm (1) drives the first platform balance rod (6) to rotate relative to the rear wheel arm (2) through the platform balance linkage rod (5), and causes the first platform balance rod (6) to fold relative to the second platform balance rod (7). The second platform balance rod (7) pushes the other side of the platform body (3) to move upward.

2. The height adjustment frame for a height-adjustable chair according to claim 1, characterized in that, It also includes a front wheel assembly (8), a rear wheel assembly (9), and a wheel balancing mechanism. The front wheel arm (1) is hinged to the front wheel assembly (8), and the rear wheel arm (2) is hinged to the rear wheel assembly (9). The wheel balancing mechanism includes a first wheel balance bar (10), a second wheel balance bar (11), a third wheel balance bar (12), and a fourth wheel balance bar (13) that are hinged in sequence. The first wheel balance bar (10) is hinged to the rear wheel assembly (9), the second wheel balance bar (11) is hinged to the rear wheel arm (2), the third wheel balance bar (12) is hinged to the front wheel arm (1), and the fourth wheel balance bar (13) is hinged to the front wheel assembly (8). The extension action of the drive member (4) drives the rear wheel arm (2) and the front wheel arm (1) to fold, and causes the third wheel balance bar (12) and the second wheel balance bar (11) to fold.

3. The height adjustment frame for a height-adjustable chair according to claim 2, characterized in that, It also includes a limiting mechanism for limiting the drive member (4), the limiting mechanism including a hinged first limiting rod (14) and a second limiting rod (15), the first limiting rod (14) being hinged to the rear wheel arm (2), and the second limiting rod (15) being hinged to the drive member (4) and the second platform balance bar (7) respectively.

4. The height adjustment frame for a height-adjustable chair according to claim 1, characterized in that, The drive unit (4) is configured as an electric push rod, a hydraulic push rod, or a pneumatic push rod.

5. The height adjustment frame for a height-adjustable chair according to claim 1, characterized in that, The platform balance linkage rod (5), the first platform balance rod (6), and the second platform balance rod (7) are hinged end to end in sequence. The hinge points of the platform balance linkage rod (5) and the front wheel arm (1), the hinge points of the front wheel arm (1) and the rear wheel arm (2), the hinge points of the first platform balance rod (6) and the rear wheel arm (2), and the hinge points of the first platform balance rod (6) and the second platform balance rod (7) are set from top to bottom. The hinge points of the platform balance linkage rod (5) and the first platform balance rod (6) and the second platform balance rod (7) and the platform body (3) are located on both sides of the rear wheel arm (2).

6. The height adjustment frame for a height-adjustable chair according to claim 2, characterized in that, The hinge point of the second wheel balance bar (11) and the third wheel balance bar (12) is located within the triangular area enclosed by the hinge point of the front wheel arm (1) and the rear wheel arm (2), the hinge point of the first wheel balance bar (10) and the rear wheel assembly (9), and the hinge point of the fourth wheel balance bar (13) and the front wheel assembly (8).

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