Lifting mechanism and desk or chair with lifting mechanism

Abstract

The utility model provides a lifting mechanism and a desk or a chair with the lifting mechanism, and belongs to the technical field of teaching equipment. The problem that existing lifting adjustment is inconvenient is solved. The lifting mechanism comprises a control sliding block, an elastic piece, a pair of outer supporting legs and inner supporting legs capable of moving up and down relative to the outer supporting legs, a plurality of adjusting holes are formed in the outer supporting legs, positioning holes are formed in the lower ends of the inner supporting legs, and lifting levers with the middles hinged to the inner supporting legs are arranged in the inner supporting legs. The lower ends of the lifting levers are provided with elastic clamping heads, the elastic clamping heads can penetrate through the positioning holes and the adjusting holes opposite to the positioning holes, the control sliding block is hinged to the upper ends of the two lifting levers through connecting rod assemblies, and the control sliding block slides to drive the two lifting levers to swing synchronously. An operator only needs to buckle the control sliding block with fingers to drive the control sliding block to move upwards in a fist clenching mode, the two lifting levers can be synchronously driven to swing, positioning is relieved, lifting adjustment is achieved, overall operation is convenient, and force application is convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of teaching equipment and relates to a lifting mechanism and a desk or a chair with the lifting mechanism. Background Art

[0002] Desks and chairs are used together as a common teaching facility, and their design usually needs to meet the learning needs of students. Students are in the growth and development period, and students at different stages have different heights. Therefore, in order to adapt to the height differences, existing desks and chairs are generally set to be liftable.

[0003] As disclosed in Chinese patent application (application number: 202221530790.0), a lifting and adjusting structure for the legs of tables and chairs comprises an outer supporting leg of a table and chair and an inner supporting leg of a table and chair which is inserted into the outer supporting leg of the table and chair, lifts up and down along the inner wall of the outer supporting leg of the table and chair, and is connected to a table board or a chair board, wherein a plurality of adjustment holes are provided on the outer supporting leg of the table and chair, and a limiting hole is provided on the lower part of the inner supporting leg of the table and chair, and is characterized in that a lifting and adjusting lever connected to the inner supporting leg of the table and chair in the middle part is provided in the inner supporting leg of the table and chair, a lifting and adjusting button passing through the inner supporting leg of the table and chair is connected to the upper end of the lifting and adjusting lever, and an elastic member is fixedly connected to the lower end of the lifting and adjusting lever, and when the inner supporting leg of the table and chair slides along the outer supporting leg of the table and chair until the limiting hole is arranged opposite to any one of the adjustment holes, one end of the elastic member passes through the limiting hole and is inserted into the corresponding adjustment hole, and the lifting and adjusting button can drive the lifting and adjusting lever to swing around the connection point to retract the elastic member and move one end of the elastic member out of the adjustment hole.

[0004] The above-mentioned desks and chairs are lifted and lowered by pressing the lifting adjustment button to drive the lifting adjustment lever to swing and unlock, but the above-mentioned lifting adjustment structure is not suitable for desks or chairs with two supporting feet on one side, such as the desk disclosed in the Chinese patent application (application number: 202311336136.5). Because the above-mentioned lifting adjustment structure is applied to the desk, there is a certain distance between the two supporting feet on the same side, which leads to a certain distance between the lifting adjustment buttons on the two supporting feet. During operation, the operator's hands cannot cover the two lifting adjustment buttons at the same time, which makes the lifting adjustment more inconvenient. Summary of the invention

[0005] The purpose of the utility model is to solve the above problems in the existing technology and to provide a lifting mechanism and a desk or chair with the lifting mechanism. The technical problem to be solved by the utility model is: how to improve the convenience of lifting and adjusting operation.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a lifting mechanism, including a pair of outer supporting legs arranged side by side, each outer supporting leg is inserted with an inner supporting leg that can move up and down relative to the outer supporting leg, the outer supporting leg is provided with a plurality of adjustment holes, the lower end of the inner supporting leg is provided with a positioning hole, a lifting lever is provided in the inner supporting leg, the middle part of the lifting lever is hinged to the inner supporting leg, the lower end of the lifting lever has an elastic clamp and the elastic clamp can pass through the positioning hole and the adjustment hole opposite to the positioning hole under the action of elastic force, and it is characterized in that the lifting mechanism also includes a control slider arranged between the two inner supporting legs and can slide up and down relative to the inner supporting legs, the control slider and the upper ends of the two lifting levers are hinged through a connecting rod assembly and the sliding of the control slider can drive the two lifting levers to swing synchronously, and the lifting mechanism also includes an elastic member that can reset the control slider.

[0007] The lifting mechanism can be used for desks or chairs with a pair of outer supporting legs and inner supporting legs on one side, or for desks or chairs with a pair of outer supporting legs and inner supporting legs on both sides, wherein the upper end of the inner supporting legs is connected to the table top or the chair seat. The lifting mechanism is provided with a fixed shell structure between the two inner supporting legs on the same side, and a control slider is slidably connected to the fixed shell. When the height of the desk or chair needs to be adjusted, the operator only needs to hold the control slider with his fingers in the form of a fist to drive the control slider to move upward relative to the fixed shell, so that the two lifting levers can be driven to swing synchronously through the two connecting rod assemblies, and then the elastic clamp at the lower end of the lifting lever can be driven to exit the adjustment hole so that the positioning between the inner supporting leg and the outer supporting leg is released, so that the lifting and lowering can be adjusted. After the adjustment is completed, the control slider is released, and it can be reset under the action of the elastic member. The overall operation is convenient and easy to apply force.

[0008] In the above lifting mechanism, the control slider is arranged near the upper end of the inner supporting leg. The upper end of the inner supporting leg is used to connect with the table board or the chair seat board. The control slider is arranged near the upper end of the inner supporting leg. The operator only needs to put the palm of the hand on the edge of the table board or the chair seat board, hold the control slider with the fingers in the form of a fist to drive the control slider to move upward relative to the fixed shell, which is more convenient to apply force during operation and has good operation convenience.

[0009] In the above lifting mechanism, the lifting mechanism also includes a fixed shell, and the two sides of the fixed shell also have a clearance groove, the two inner supporting legs are respectively embedded in the two clearance grooves, and the outer walls of the inner supporting legs are fitted and fixed with the inner walls of the clearance grooves, and the control slider is slidably connected to the fixed shell. The two ends of the fixed shell are buckled on the two inner supporting legs, and the connection stability is good. At the same time, the fixed shell can also be well hidden between the two inner supporting legs and the table board or chair seat board.

[0010] In the above lifting mechanism, the connecting rod assembly includes a straight connecting rod 1 and an arc-shaped connecting rod 2. One end of the connecting rod 1 is connected to the lifting lever, and the other end extends into the fixed shell and is hinged to one end of the connecting rod 2. The other end of the connecting rod 2 is hinged to the control slider. The connecting rod 2 is arc-shaped. When the air slider moves upward, the swing of the connecting rod 2 around the hinge point can generate a horizontal thrust on the connecting rod 1, thereby driving the lifting lever to swing, making the operation more labor-saving and convenient.

[0011] In the above lifting mechanism, a guide part is provided on the top wall of the fixed shell above the two connecting rod assemblies, and the guide part has a guide slope that tilts upward from the middle of the fixed shell to both sides, and the end of the connecting rod 2 hinged to the connecting rod 1 can be in contact with the guide slope. Through the setting of the guide slope, a guide can be formed for the swing stroke of the connecting rod 2, and the end of the connecting rod 2 can slide along the guide slope. At the same time, with the arc structure of the connecting rod 2 itself, a large horizontal thrust can be generated on the connecting rod 1 to push the lifting lever to swing outward, making the operation more labor-saving and convenient.

[0012] In the above-mentioned lifting mechanism, the end of the connecting rod 2 has two spaced-apart hinged arms, the end of the connecting rod 1 extends between the two hinged arms and is hinged with the two hinged arms through a pin, the fixed shell includes a shell 1 and a shell 2, the shell 1 and the shell 2 are detachably connected through fasteners, the shell 1 and the shell 2 are both provided with the two guide parts, the guide part on the shell 1 and the guide part on the shell 2 are arranged one-to-one and there is a spacing between the two corresponding guide parts, and the two hinged arms can be respectively abutted against the corresponding guide parts on the shell 1 and the shell 2. The two guide parts are respectively abutted against the two hinged arms on the connecting rod 2, which can form a guide for the swing stroke of the connecting rod 2, and the spacing between the two guide parts can provide a space for the upward swing of the connecting rod 1, so that the lifting lever can be driven to realize the swing release positioning more smoothly, making the operation of the entire lifting adjustment smoother and more convenient.

[0013] In the above lifting mechanism, the lower end of the fixed shell has a door-shaped notch, the control slider has a tubular connecting portion, the elastic member is a spring, one end of the spring is sleeved on the connecting portion, and the other end is against the top wall of the fixed shell, and the controlled slider is partially located in the notch under the elastic force of the spring. The design of the notch allows the control slider to partially extend from the fixed shell under the action of the spring, which is convenient for operators to operate.

[0014] In the above lifting mechanism, the control slider is in the shape of a long box with an open top, and two hinge grooves are provided in the control slider, the second connecting rod is embedded in the hinge groove and hinged to the groove wall of the hinge groove through a pin, the connecting part is located in the middle of the control slider, and the two hinge grooves are respectively located on both sides of the connecting part. Through the above design, the control slider moves upward to drive the second connecting rod to swing around the hinge point with better stability, without shaking, making the lifting adjustment smoother.

[0015] A desk is characterized in that it comprises the above-mentioned lifting mechanism.

[0016] A classroom chair, characterized in that it comprises the above-mentioned lifting control mechanism.

[0017] Compared with the prior art, the lifting mechanism has the following advantages: the operator only needs to place his palm on the edge of the table top or the chair seat, hold the control slider with his fingers and drive the control slider upward in the form of a fist, so as to synchronously drive the two lifting levers to swing and release the positioning to achieve the lifting adjustment. The overall operation is convenient and easy to apply force. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural diagram of this lifting mechanism.

[0019] Figure 2 The three-dimensional structure of the desk with the lifting mechanism Figure 1 .

[0020] Figure 3 The three-dimensional structure of the desk with the lifting mechanism Figure 2 .

[0021] Figure 4 It is a cross-sectional view of a desk with the lifting mechanism Figure 1 .

[0022] Figure 5 It is a cross-sectional view of a desk with the lifting mechanism Figure 2 .

[0023] Figure 6 It is a partial three-dimensional structural diagram of the lifting mechanism.

[0024] Figure 7 This is a partial exploded view of the lifting mechanism.

[0025] Figure 8 It is a three-dimensional diagram of the shell 2.

[0026] In the figure, 1, outer supporting leg; 1a, adjustment hole; 2, inner supporting leg; 2a, positioning hole; 3, lifting lever; 3a, elastic clamp; 3b, U-shaped spring piece; 4, fixing shell; 4a, guide part; 4a1, guide slope; 4b, shell one; 4c, shell two; 4d, notch; 4e, give way groove; 5, control slider; 5a, hinge groove; 5b, connecting part; 6, connecting rod assembly; 6a, connecting rod one, 6b, connecting rod two; 6b1, hinged arm; 7, elastic part; 8, table top; 9, base. DETAILED DESCRIPTION

[0027] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0028] Embodiment 1

[0029] like Figure 1 As shown, the lifting mechanism includes a pair of outer supporting legs 1, a fixed shell 4 and a control slide block 5. Each outer supporting leg 1 is inserted with an inner supporting leg 2 that can move up and down relative to the outer supporting leg 1. The outer supporting leg 1 is provided with a plurality of adjustment holes 1a, and the lower end of the inner supporting leg 2 is provided with a positioning hole 2a. A support sleeve is also provided between the lower end of the inner supporting leg 2 and the upper end of the outer supporting leg 1. The inner wall of the support sleeve is in contact with the outer wall of the inner supporting leg 2. The outer wall of the support sleeve has a plurality of convex edges, and the convex edges are in contact with the inner wall of the outer supporting leg 1. The support sleeve is also provided with a perforation corresponding to the positioning hole 2a. The support sleeve is made of plastic or rubber material, and the support sleeve is provided to prevent the inner supporting leg 2 and the outer supporting leg 1 from shaking due to the existence of the gap.

[0030] like Figure 1-5 As shown, a lifting lever 3 is provided inside the inner supporting leg 2, the middle part of the lifting lever 3 is hinged to the inner supporting leg 2, the lower end of the lifting lever 3 is provided with a U-shaped spring piece 3b, the U-shaped spring piece 3b is provided with an elastic clamp 3a, one end of the U-shaped spring piece 3b is pressed against the inner wall of the inner supporting leg 2 and the elastic clamp 3a can pass through the positioning hole 2a and the adjustment hole 1a aligned with the positioning hole 2a in sequence under the elastic force of the U-shaped spring piece 3b.

[0031] The fixed shell 4 is arranged between the upper ends of the two inner supporting legs 2, and the two sides of the fixed shell 4 also have a clearance groove 4e. The two inner supporting legs 2 are respectively embedded in the two clearance grooves 4e and the outer wall of the inner supporting leg 2 is fixedly fitted with the inner wall of the clearance groove 4e.

[0032] Specifically, if Figure 6 and 7As shown, the fixed shell 4 is roughly rectangular and includes a shell 1 4b and a shell 2 4c, and the shell 1 4b and the shell 2 4c are detachably connected by fasteners. The two opposite inner walls of the shell 1 4b and the shell 2 4c are provided with a slide groove, and the control slider 5 is in the shape of a long box with an open upper end. The control slider 5 is slidably connected in the slide groove and can slide up and down relative to the fixed shell 4. The inner walls of the shell 1 4b and the shell 2 4c are also provided with a plurality of reinforcing ribs.

[0033] The lower end of the fixed shell 4 has a notch 4d in the shape of a door. An elastic member 7 is provided between the control slider 5 and the top wall of the fixed shell 4. The elastic member 7 is a spring. The control slider 5 has a tubular connecting portion 5b, which is located in the middle of the control slider 5. One end of the spring is sleeved on the connecting portion 5b, and the other end is against the top wall of the fixed shell 4. The control slider 5 is partially located in the notch 4d under the elastic force of the spring. The control slider 5 and the upper ends of the corresponding two lifting levers 3 are hinged through the connecting rod assembly 6, and the sliding of the control slider 5 can drive the two lifting levers 3 to swing synchronously.

[0034] Furthermore, if Figure 7 and 8 As shown, the connecting rod assembly 6 includes a straight connecting rod 1 6a and an arc-shaped connecting rod 2 6b, one end of the connecting rod 2 6b has two spaced-apart hinge arms 6b1, one end of the connecting rod 1 6a is connected to the lifting lever 3, and the other end extends into the fixed housing 4 and extends between the two hinge arms 6b1 and is hinged to the two hinge arms 6b1 through a pin. Two hinge grooves 5a are also provided in the control slider 5, and the two hinge grooves 5a are respectively located on both sides of the connecting portion 5b, and the other end of the connecting rod 2 6b is embedded in the hinge groove 5a and is hinged to the groove wall of the hinge groove 5a through a pin.

[0035] Two guide portions 4a are further provided on the top walls of the shell 1 4b and the shell 2 4c along the length direction. The guide portions 4a on the shell 1 4b and the guide portions 4a on the shell 2 4c are arranged one-to-one and there is a spacing between the two corresponding guide portions 4a. The guide portions 4a have guide inclined surfaces 4a1 that are inclined upward from the middle of the fixed shell 4 to both sides. The two hinged arms 6b1 can be respectively abutted against the corresponding guide portions 4a on the shell 1 4b and the shell 2 4c.

[0036] The lifting control mechanism can be used for desks or chairs with a pair of outer supporting legs 1 and inner supporting legs 2 on one side, or desks or chairs with a pair of outer supporting legs 1 and inner supporting legs 2 on both sides. The outer supporting legs 1 are fixed on the bottom feet 9, and the inner supporting legs 2 are fixed on the table top 8 or the seat board. When the height of the desk or chair needs to be adjusted, the operator only needs to put the palm of his hand on the edge of the table top 8 or the seat board, hold the control slider 5 with his fingers in the form of a fist, and drive the control slider 5 to move up relative to the fixed shell 4, so that the two lifting levers 3 can be driven to swing synchronously through the two connecting rod assemblies 6, and then drive the elastic clamp 3a at the lower end of the lifting lever 3 to exit the adjustment hole 1a so that the positioning between the inner supporting leg 2 and the outer supporting leg 1 can be released, and the lifting and lowering adjustment can be performed. The overall operation is convenient and easy to apply force.

[0037] Embodiment 2

[0038] like Figure 2-5 As shown, a desk is provided with a lifting mechanism as described in the first embodiment.

[0039] When the desk is in normal use, the elastic clamps 3a on the two lifting levers 3 pass through the positioning hole 2a, the through hole and the adjustment hole 1a aligned with the positioning hole 2a in sequence under the elastic force of the U-shaped spring piece 3b, and the inner supporting leg 2 and the outer supporting leg 1 are in a positioning state. Figure 2 and 4 When the height of the desk needs to be adjusted, the operator places his palm on the edge of the table top 8, holds the control slider 5 with his fingers in the form of a fist, drives the control slider 5 to overcome the force of the spring and move upward relative to the fixed shell 4, and the two arc-shaped connecting rods 6b swing synchronously around the hinge point to generate a horizontal thrust on the connecting rod 1 6a, thereby driving the two lifting levers 3 to swing synchronously around the hinge point so that the elastic clamp 3a overcomes the elastic force of the U-shaped spring piece 3b and disengages from the adjustment hole 1a, and the positioning between the two inner support legs 2 and the corresponding outer support legs 1 is released, so that the lifting and lowering adjustment can be performed, as shown in FIG. Figure 3 and 5 After the adjustment is completed, the control slider 5 is released, and the control slider 5 drives the two lifting levers 3 to reset synchronously, and the elastic clamp 3a is re-engaged in the adjustment hole 1a opposite to it after the height adjustment, so that the inner support leg 2 is positioned with the outer support leg 1, and the overall operation is convenient and force is easy to apply.

[0040] Embodiment 3

[0041] A classroom chair is provided with a lifting mechanism as described in the first embodiment.

[0042] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0043] Although this article uses more terms such as outer supporting leg 1, adjustment hole 1a, inner supporting leg 2, positioning hole 2a, lifting lever 3, elastic clamp 3a, U-shaped spring 3b, fixed shell 4, guide part 4a, guide slope 4a1, shell 1 4b, shell 2 4c, notch 4d, give way groove 4e, control slide block 5, hinge groove 5a, connecting part 5b, connecting rod assembly 6, connecting rod 1 6a, connecting rod 2 6b, hinge arm 6b1, elastic member 7, table top 8, foot 9, etc., it does not exclude the possibility of using other terms. The use of these terms is only for more convenient description and explanation of the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A lifting mechanism, comprising a pair of outer supporting legs (1) arranged side by side, each outer supporting leg (1) is inserted with an inner supporting leg (2) capable of moving up and down relative to the outer supporting leg (1), the outer supporting leg (1) is provided with a plurality of adjustment holes (1a), the lower end of the inner supporting leg (2) is provided with a positioning hole (2a), a lifting lever (3) is provided in the inner supporting leg (2), the middle part of the lifting lever (3) is hinged to the inner supporting leg (2), the lower end of the lifting lever (3) has an elastic clamp (3a) and the elastic clamp (3a) can pass through the positioning hole (2a) and the adjustment hole (1a) opposite to the positioning hole (2a) under the action of elastic force, characterized in that: The lifting mechanism further comprises a control slider (5) which is arranged between the two inner supporting legs (2) and can slide up and down relative to the inner supporting legs (2); the control slider (5) and the upper ends of the two lifting levers (3) are hingedly connected via a connecting rod assembly (6); and the sliding of the control slider (5) can drive the two lifting levers (3) to swing synchronously; the lifting mechanism further comprises an elastic member (7) which can reset the control slider (5).

2. The lifting mechanism according to claim 1, characterized in that: The control slide block (5) is arranged close to the upper end of the inner supporting leg (2).

3. The lifting mechanism according to claim 1, characterized in that: The lifting mechanism also includes a fixed shell (4), and the two sides of the fixed shell (4) are also provided with clearance grooves (4e), the two inner supporting legs (2) are respectively embedded in the two clearance grooves (4e), and the outer walls of the inner supporting legs (2) are fitted and fixed with the inner walls of the clearance grooves (4e), and the control slider (5) is slidably connected to the fixed shell (4).

4. The lifting mechanism according to claim 3, characterized in that: The connecting rod assembly (6) comprises a straight connecting rod 1 (6a) and an arc-shaped connecting rod 2 (6b), one end of the connecting rod 1 (6a) is connected to the lifting lever (3), and the other end extends into the fixed shell (4) and is hinged to one end of the connecting rod 2 (6b), and the other end of the connecting rod 2 (6b) is hinged to the control slider (5).

5. The lifting mechanism according to claim 4, characterized in that: A guide portion (4a) is provided on the top wall of the fixed shell (4) above the two connecting rod assemblies (6), and the guide portion (4a) has a guide inclined surface (4a1) that is inclined upward from the middle of the fixed shell (4) to both sides, and one end of the connecting rod 2 (6b) hinged to the connecting rod 1 (6a) can be in contact with the guide inclined surface (4a1).

6. The lifting mechanism according to claim 5, characterized in that: The end of the second connecting rod (6b) has two hinged arms (6b1) arranged at intervals, the end of the first connecting rod (6a) extends between the two hinged arms (6b1) and is hinged to the two hinged arms (6b1) through a pin shaft, the fixed shell (4) includes a shell body (4b) and a shell body (4c), the shell body (4b) and the shell body (4c) are detachably connected through fasteners, the shell body (4b) and the shell body (4c) are both provided with the two guide parts (4a), the guide parts (4a) on the shell body (4b) and the guide parts (4a) on the shell body (4c) are arranged one by one correspondingly, and there is a distance between the two corresponding guide parts (4a), and the two hinged arms (6b1) can be respectively abutted against the corresponding guide parts (4a) on the shell body (4b) and the shell body (4c).

7. The lifting mechanism according to claim 4, 5 or 6, characterized in that: The lower end of the fixed shell (4) has a door-shaped notch (4d), the control slider (5) has a tubular connecting portion (5b), the elastic member (7) is a spring, one end of the spring is sleeved on the connecting portion (5b), and the other end abuts against the top wall of the fixed shell (4), and the controlled slider (5) is partially located in the notch (4d) under the elastic force of the spring.

8. The lifting mechanism according to claim 7, characterized in that: The control slider (5) is in the shape of a long box and has an open upper end. Two hinge grooves (5a) are also provided in the control slider (5). The second connecting rod (6b) is embedded in the hinge groove (5a) and is hinged to the groove wall of the hinge groove (5a) through a pin shaft. The connecting part (5b) is located in the middle of the control slider (5), and the two hinge grooves (5a) are respectively located on both sides of the connecting part (5b).

9. A desk, characterized in that: The desk comprises the lifting mechanism described in any one of claims 1-8.

10. A classroom chair, characterized in that: The classroom chair comprises the lifting mechanism described in any one of claims 1-8.

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