A tray on a chair and a torsion spring torque adjustment structure thereof

Abstract

The present invention discloses a torsion spring torque adjustment structure, comprising a swing block, a screw rod and at least one torsion spring, one end of the swing block is penetrated by a mandrel, and the mandrel is sleeved with a torsion spring; the other end of the swing block is fixedly connected or integrally formed with a torque adjustment block, the lower end of the torque adjustment block is provided with a push block, the screw rod passes through the push block and is threadedly connected with the push block; the lower end surface of the torque adjustment block forms a first inclined surface, the upper end surface of the push block forms a second inclined surface that abuts against the first inclined surface, and one end of the torsion spring is movably mounted on the torque adjustment block and gives the torque adjustment block a tendency to move in the direction of the push block, the screw rod rotates to drive the push block to move horizontally, and the horizontal movement of the push block prompts the torque adjustment block to move up and down. The torsion spring torque adjustment structure causes the push block to move horizontally by rotating the screw rod, and the torque adjustment block moves up and down under the action of the push block. Further, the torque adjustment block changes the torsion of the torsion spring, and the operation is relatively simple.

Description

Technical Field

[0001] The invention relates to a chair tray structure, and more particularly to a tray on a chair and a torsion spring torsion adjustment structure thereof. Background Art

[0002] A chair tray with seat lifting, seat reclining and backrest reclining functions usually includes a middle tray group connected to a gas pressure rod, a flap connected to a backrest and a large tray group connected to a seat. A reset torsion spring for resetting is usually provided on the hinge connecting the large tray group and the middle tray group and the hinge connecting the flap and the large tray group. After a certain period of use, the torsion of the reset torsion spring will change to a certain extent. For example, the torsion of the reset torsion spring is weakened, which in turn affects the functions of seat lifting, seat reclining and backrest reclining. In the prior art, some chair trays are provided with a mechanism for adjusting the torsion of the reset torsion spring. However, there are still some shortcomings, including the following:

[0003] 1. When adjusting the torque of the reset torsion spring, a large external force is required to achieve it;

[0004] 2. When fixing the torque of the torsion spring, a locking component is required, and the operation is relatively complicated.

[0005] The patent document with the authorization announcement number CN203576041U discloses a torsion spring torque adjustment mechanism for a chair tray, including a housing, a chair tray pivot and a reset torsion spring sleeved on the chair tray pivot, and also including a positioning block, a cam and an adjusting rod, wherein one end of the reset torsion spring is provided with an L-shaped bending section, the L-shaped bending section abuts against the positioning block, the other side of the positioning block opposite to the abutting connection with the L-shaped bending section abuts against the cam arc surface, the adjusting rod is fixedly connected to the cam and controls the circumferential rotation of the cam, and the surface of the positioning block abutting against the L-shaped bending section is an arc surface, aiming to provide a chair tray torsion spring torque adjustment mechanism that can adjust the torsion of the reset torsion spring and is easy to use and operate. The adjustment mechanism adjusts the torsion of the torsion spring by rotating the cam and squeezing the positioning block, which requires a strong external force; in addition, the torsion of the torsion spring is fixed by the cooperation of the annular latch tooth and the annular latch tooth hole, and the operation is relatively cumbersome.

[0006] The patent document with the authorization announcement number CN206324514U discloses a torsion spring adjustment mechanism for a swivel chair tray, including a base, an intermediate seat and a seesaw, wherein a triangular push block is arranged in the intermediate seat, the triangular push block is connected to a transmission mechanism, the inclined surface of the triangular push block contacts a torsion spring adjustment block, and the end surface of one end of the torsion spring adjustment block has a contact surface matching the inclined surface of the triangular push block, the other end of the torsion spring adjustment block is connected to a torsion spring, and the torsion spring is connected to the intermediate seat. The adjustment mechanism pushes the triangular push block to move by adjusting the screw, and the triangular push block drives the torsion spring adjustment block to displace and thus adjust the torsion of the torsion spring. However, by analyzing the force on the torsion spring adjustment block, we can find that the torsion spring adjustment block is subjected to forces in two directions, including a force parallel to the movement direction of the torsion spring adjustment block and a force perpendicular to the movement direction of the torsion spring adjustment block. The former pushes the torsion spring adjustment block to move in the direction of the torsion spring, and the latter increases the friction between the torsion adjustment block and the base. When adjusting the torsion of the torsion spring, a strong external force is required, which affects the user experience. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a tray on a chair and a torsion spring torque adjustment structure thereof. The torsion spring torque adjustment structure on the tray can adjust the torsion spring torque without the aid of other locking mechanisms, and its operation is relatively simple and labor-saving.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a torsion spring torque adjustment structure, comprising a swing block, a screw and at least one torsion spring, a spindle is passed through one end of the swing block, and the swing block can rotate relative to the spindle, and a torsion spring is sleeved on the spindle; the other end of the swing block is fixedly connected or integrally formed with a torque adjustment block, and a push block is provided at the upper end of the torque adjustment block, and the screw passes through the push block and is threadedly connected with the push block; the upper end surface of the torque adjustment block forms a first inclined surface, and the lower end surface of the push block forms a second inclined surface that is against the first inclined surface, and one end of the torsion spring is movably mounted on the torque adjustment block and gives the torque adjustment block a tendency to move in the direction of the push block, and the rotation of the screw drives the push block to move horizontally, and the horizontal movement of the push block prompts the torque adjustment block to move up and down, and the torque adjustment block then compresses or relaxes the torsion spring.

[0009] The push block is moved horizontally by rotating the screw rod. Under the force of the push block, the torque adjustment block moves up and down. Furthermore, the torque adjustment block changes the torsion of the torsion spring. When the torque adjustment block moves upward under the action of the push block, the torsion of the torsion spring is enhanced. When the torque adjustment block moves downward under the action of the push block, the torsion of the torsion spring is weakened. Compared with the prior art, on the one hand, the present invention drives the push block to move horizontally by rotating the screw rod, so that the torque adjustment block moves up and down, thereby realizing the adjustment of the torsion of the torsion spring. The friction between the push block and other components is small, and it is more labor-saving to adjust the torsion of the torsion spring. On the other hand, when fixing the torsion of the torsion spring, it is not necessary to rely on other external forces. The torsion spring gives the torque adjustment block a force to move downward. The force acts on the push block and decomposes the force into a component force in the vertical direction and a component force in the horizontal direction. The component force in the horizontal direction acts on the screw rod so that the push block and the screw rod are relatively fixed, thereby realizing the fixing of the torsion of the torsion spring.

[0010] Preferably, a limit block is provided below the torque adjustment block, the limit block is provided with a first groove for upper and lower limit and accommodating the torque adjustment block, and a limit plate portion is extended upward from one end of the limit block away from the torsion spring; a second groove for sliding the push block and matching the bottom shape of the push block is provided on one side of the limit block located at the first groove. The limit plate portion and the second groove cooperate to limit the push block circumferentially to prevent it from rotating circumferentially.

[0011] Preferably, a driving mechanism for driving the screw to rotate is provided at one end of the screw, and the driving mechanism includes a handle and at least two gears, the gears are meshed with each other, a first gear is fixed on the handle, and one end of the handle close to the limit block is rotatably connected to the limit block, a second gear is fixed on the screw, and the first gear and the second gear are directly meshed or indirectly meshed through at least one gear. The screw is driven to rotate through the transmission of the gears, and the operation is relatively labor-saving.

[0012] Preferably, the driving mechanism includes a handle and two gears, a first gear is fixed on the handle, a second gear is fixed on the screw, the first gear and the second gear are meshed, and the outer diameter of the first gear is larger than the outer diameter of the second gear. The large gear on the handle drives the small gear on the screw to rotate, and the torsion of the torsion spring can be adjusted by rotating the handle slightly.

[0013] Preferably, in the horizontal direction, the second inclined surface of the push block is inclined from top to bottom in the direction from left to right, and the second inclined surface is twisted, and the right end of the push block is inclined from top to bottom in the direction from back to front; in the horizontal direction, the first inclined surface of the torque adjustment block is inclined from top to bottom in the direction from left to right, and the first inclined surface is twisted, and the right end of the torque adjustment block is inclined from top to bottom in the direction from back to front.

[0014] When the swing block rotates with the spindle as the center, the running trajectory of the end of the swing block away from the spindle is an arc, that is, the end of the swing block away from the spindle will be displaced forward relative to the push block. If the second inclined surface of the push block and the first inclined surface of the torque adjustment block are planar structures, when the swing block rotates, the end of the torque adjustment block away from the torsion spring will tilt up, and the surface contact between the two will gradually change into line and surface contact. When used for a long time, the inclined surfaces of the push block and the torque adjustment block will be damaged, and even the line contact part will gradually develop into a planar structure, which will increase the resistance to rotation. Setting it in a twisted shape can maximize the surface contact and reduce damage to the push block and the torque adjustment block.

[0015] Preferably, a third groove is provided at the middle of the upper end of the torque adjustment block, and a fourth groove is provided at the middle of the lower end of the push block, thereby reducing the probability of the side of the torque adjustment block abutting against the inclined surface of the push block, and thus achieving good protection for the inclined surface.

[0016] Preferably, the end of the swing block away from the torque adjustment block has two support columns extending along the axial direction of the mandrel, the support columns are sleeved on the mandrel, and the outer diameter of the support columns is less than or equal to the inner diameter of the torsion spring, so as to avoid the torsion spring from twisting when subjected to a large force, thereby protecting the torsion spring.

[0017] Preferably, an arc-shaped groove is provided on the torsion adjusting block at a position in contact with the torsion spring, and one end of the torsion spring is movably mounted on the lower end of the torsion adjusting block and embedded in the arc-shaped groove. The arc-shaped groove can limit the torsion spring and prevent it from being displaced in the horizontal direction.

[0018] Preferably, two torsion springs are included, both of which are sleeved on the spindle and respectively arranged on two opposite sides of the swing block, thereby increasing the force on the acted component and making the force more uniform.

[0019] A tray on a chair comprises the torsion spring torque adjustment structure as described above, one end of the torsion spring is movably mounted on the torque adjustment block, the other end of the torsion spring is connected to the chair back swing assembly, the left and right ends of the spindle are respectively rotatably connected or fixedly connected to the tray, and the screw is rotatably connected to the tray. In summary, the present invention has the following beneficial effects:

[0020] 1. The push block is moved horizontally by rotating the screw rod. Under the force of the push block, the torque adjustment block moves up and down. Furthermore, the torque adjustment block changes the torsion of the torsion spring. When the torque adjustment block moves upward under the action of the push block, the torsion of the torsion spring increases. When the torque adjustment block moves downward under the action of the push block, the torsion of the torsion spring decreases. The operation is relatively simple.

[0021] 2. When locking the torsion spring torque, no other locking mechanism is needed;

[0022] 3. The screw is driven to rotate through the transmission action of the gear, and its operation is relatively labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a torsion spring torque adjustment structure;

[0024] Figure 2 It is a structural schematic diagram of installing a limit block on a torsion spring torque adjustment structure;

[0025] Figure 3 for Figure 1 Bottom view of

[0026] Figure 4 It is a structural schematic diagram of the swing block;

[0027] Figure 5 It is a schematic diagram of the structure of the push block;

[0028] Figure 6 A schematic diagram of the structure of the swing block from another perspective;

[0029] Figure 7 It is a structural schematic diagram of the limit block;

[0030] Figure 8 The schematic diagram of the structure of the torsion spring torque adjustment structure installed on the tray of the chair;

[0031] Fig. 9 for Figure 8 Bottom view of .

[0032] Figure numerals: 1. swing block; 2. screw rod; 3. torsion spring; 4. spindle; 5. torque adjustment block; 6. push block; 7. arc groove; 8. limit block; 9. first groove; 10. limit plate; 11. second groove; 12. handle; 13. first gear; 14. second gear; 15. third groove; 16. fourth groove; 17. support column; 18. chair back swing assembly. DETAILED DESCRIPTION

[0033] The present invention will be further described with reference to the accompanying drawings.

[0034] This embodiment discloses a tray on a chair and a torsion spring torque adjustment structure thereof, such as Figures 1 to 5As shown, it includes a swing block 1, a screw rod 2 and at least one torsion spring 3. A spindle 4 is passed through one end of the swing block 1, and the swing block 1 can rotate relative to the spindle 4. The torsion spring 3 is sleeved on the spindle 4; the other end of the swing block 1 is fixedly connected or integrally formed with a torque adjustment block 5, and a push block 6 is provided at the upper end of the torque adjustment block 5. The screw rod 2 passes through the push block 6 and is threadedly connected to the push block 6; the upper end surface of the torque adjustment block 5 forms a first inclined surface, the lower end surface of the push block 6 forms a second inclined surface that abuts against the first inclined surface, and one end of the torsion spring 3 can be It is movably installed on the torque adjustment block 5 and gives the torque adjustment block 5 a tendency to move in the direction of the push block 6. Specifically, the part of the torque adjustment block 5 that contacts the torsion spring 3 is provided with an arc groove 7. One end of the torsion spring 3 is pressed against the lower end of the torque adjustment block 5 and embedded in the arc groove 7. When the swing block 1 rotates, the part of the torsion spring 3 close to the torque adjustment block 5 is embedded in the arc groove 7 and is limited in the arc groove 7. The setting of the arc groove 7 can limit the torsion spring 3 and prevent it from being displaced in the horizontal direction. The rotation of the screw 2 drives the push block 6 to move horizontally, and the horizontal movement of the push block 6 prompts the torque adjustment block 5 to move up and down. Preferably, it includes two torsion springs 3, both of which are sleeved on the spindle 4 and are respectively arranged on the opposite sides of the swing block 1, so that the force on the acted component can be increased and the force can be more uniform. The push block 6 is moved horizontally by rotating the screw rod 2. Under the action of the push block 6, the torque adjustment block 5 moves up and down. Further, the torque adjustment block 5 changes the torsion of the torsion spring 3. When the torque adjustment block 5 moves upward under the action of the push block 6, the torsion of the torsion spring 3 increases. When the torque adjustment block 5 moves downward under the action of the push block 6, the torsion of the torsion spring 3 decreases. Compared with the existing technology, on the one hand, the present invention drives the push block 6 to move horizontally through the rotation of the screw rod 2, so that the torque adjustment block 5 moves up and down, thereby realizing the adjustment of the torque of the torsion spring 3. The friction between the push block 6 and other components is small, and it is more labor-saving to adjust the torque of the torsion spring 3. Of course, when the screw rod 2 rotates, it will drive the push block 6 to rotate. However, the interaction between the first inclined surface and the second inclined surface will hinder the rotation of the push block 6; on the other hand, when fixing the torsion of the torsion spring 3, there is no need to rely on other external forces. The torsion spring 3 gives the torque adjustment block 5 a force to move downward. This force acts on the push block 6 and is decomposed into a component force in the vertical direction and a component force in the horizontal direction. The component force in the horizontal direction acts on the screw rod 2 to make the push block 6 and the screw 2 relatively fixed, thereby realizing the fixation of the torsion of the torsion spring 3.

[0035] In order to prevent the torque adjusting block 5 from rotating simultaneously with the rotation of the screw rod 2, Figure 1 , Figure 2 and Figure 7As shown, a limit block 8 is arranged below the torque adjustment block 5, and a first groove 9 for upper and lower limit and accommodating the torque adjustment block 5 is provided on the limit block 8, and a limit plate portion 10 is extended upward from one end of the limit block 8 away from the torsion spring 3; a second groove 11 for sliding the push block 6 and matching the bottom shape of the push block 6 is also provided on one side of the first groove 9 of the limit block 8. The limit plate portion 10 and the second groove 11 cooperate to limit the push block 6 circumferentially to prevent it from rotating circumferentially. In fact, the first inclined surface on the torque adjustment block 5 cooperates with the second inclined surface on the push block 6, which can hinder the push block 6 from rotating circumferentially to a certain extent, and the setting of the limit block 8 can further limit the circumferential rotation of the push block 6.

[0036] like Figure 1 , Figure 2 and Figure 3 As shown, one end of the screw rod 2 is also provided with a driving mechanism for driving the screw rod 2 to rotate, the driving mechanism includes a handle 12 and at least two gears, the gears are meshed, a first gear 13 is fixed on the handle 12, and one end of the handle 12 close to the limit block 8 is rotatably connected to the limit block 8, a second gear 14 is fixed on the screw rod 2, and the first gear 13 and the second gear 14 are directly meshed or indirectly meshed through at least one gear. The screw rod 2 is driven to rotate through the transmission of the gears, and its operation is relatively labor-saving. Specifically, the driving mechanism includes a handle 12 and two gears, a first gear 13 is fixed on the handle 12, and a second gear 14 is fixed on the screw rod 2, the first gear 13 and the second gear 14 are meshed, and the outer diameter of the first gear 13 is greater than the outer diameter of the second gear 14. The large gear on the handle 12 drives the small gear on the screw rod 2 to rotate, and the torque of the torsion spring 3 can be adjusted by rotating the handle 12 slightly.

[0037] like Figure 4 and Figure 5 As shown, in the horizontal direction, the second inclined surface of the push block 6 is inclined from top to bottom along the direction from left to right, and the second inclined surface is twisted, and the right end of the push block 6 is inclined from top to bottom along the direction from back to front; in the horizontal direction, the first inclined surface of the torque adjustment block 5 is inclined from top to bottom along the direction from left to right, and the first inclined surface is twisted, and the right end of the torque adjustment block 5 is inclined from top to bottom along the direction from back to front.

[0038] When the swing block 1 rotates around the spindle 4, the running trajectory of the end of the swing block 1 away from the spindle 4 is an arc, that is, the end of the swing block 1 away from the spindle 4 will be displaced backward relative to the push block 6. If the second inclined surface of the push block 6 and the first inclined surface of the torque adjustment block 5 are planar structures, when the swing block 1 rotates, the end of the torque adjustment block 5 away from the torsion spring 3 will be tilted, and the surface contact between the two will gradually be transformed into line and surface contact. When used for a long time, the inclined surfaces of the push block 6 and the torque adjustment block 5 will be damaged, and even the line contact part will gradually develop into a planar structure, which will increase the resistance to rotation. The first inclined surface and the second inclined surface are set to be twisted, which can maximize the surface contact and reduce damage to the push block 6 and the torque adjustment block 5. Preferably, a third groove 15 is provided in the middle of the upper end of the torque adjustment block 5; a fourth groove 16 is provided in the middle of the lower end of the push block 6, which can reduce the probability of the side of the torque adjustment block 5 and the inclined surface of the push block 6 to collide with each other, and can achieve good protection for the inclined surface.

[0039] In addition, if Figure 1 As shown, two support columns 17 are provided on the end of the swing block 1 away from the torque adjustment block 5 and extend axially along the main shaft 4. The support columns 17 are sleeved on the main shaft 4, and the outer diameter of the support columns 17 is less than or equal to the inner diameter of the torsion spring 3. This can prevent the torsion spring 3 from twisting when it is subjected to a large force, thereby protecting the torsion spring 3.

[0040] A tray on a chair, such as Figure 8 and Fig. 9 As shown, it includes the torsion spring torque adjustment structure as described above, one end of the torsion spring 3 is movably mounted on the torque adjustment block 5, the other end of the torsion spring 3 is connected to the chair back swing assembly, the left and right ends of the spindle 4 are respectively rotatably connected or fixedly connected to the tray, and the screw 2 is rotatably connected to the tray. When the torsion spring 3 torque adjustment structure is applied to the chair back tilt, one end of the torsion spring 3 is movably mounted on the lower end of the torque adjustment block 5, and the other end of the torsion spring 3 is connected to the swing assembly, and the backrest force can be adjusted by rotating the screw 2.

[0041] The specified directions in this specific embodiment are only for the convenience of describing the positional relationship and the coordination relationship between the components. The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiment. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A torsion spring torque adjustment structure, characterized by: The invention comprises a swing block (1), a screw rod (2) and two torsion springs (3), wherein the two torsion springs (3) are sleeved on a spindle (4) and are respectively arranged on two opposite sides of the swing block (1); one end of the swing block (1) is penetrated by a spindle (4), and the swing block (1) can rotate relative to the spindle (4); the torsion spring (3) is sleeved on the spindle (4); the other end of the swing block (1) is fixedly connected or integrally formed with a torque adjustment block (5), the upper end of the torque adjustment block (5) is provided with a push block (6), and the screw rod (2) penetrates through the spindle (4). The push block (6) is threadedly connected with the push block (6); the upper end surface of the torque adjustment block (5) forms a first inclined surface, the lower end surface of the push block (6) forms a second inclined surface that abuts against the first inclined surface, and one end of the torsion spring (3) is movably mounted on the torque adjustment block (5) and gives the torque adjustment block (5) a tendency to move toward the push block (6), the screw rod (2) rotates to drive the push block (6) to move horizontally, the horizontal movement of the push block (6) prompts the torque adjustment block (5) to move up and down, and the torque adjustment block (5) then compresses or relaxes the torsion spring (3); The invention also comprises a limit block (8) arranged below the torque adjustment block (5); the limit block (8) is provided with a first groove (9) for upper and lower limiting and accommodating the torque adjustment block (5); an end of the limit block (8) away from the torsion spring (3) extends upwardly with a limit plate (10); and a second groove (11) for sliding the push block (6) and matching the bottom shape of the push block (6) is provided on one side of the limit block (8) located at the first groove (9); A driving mechanism for driving the screw rod (2) to rotate is provided at one end of the screw rod (2), the driving mechanism comprising a handle (12) and two gears, the gears being meshed with each other, a first gear (13) being fixed on the handle (12), and an end of the handle (12) close to the limit block (8) being rotatably connected to the limit block (8), a second gear (14) being fixed on the screw rod (2), the first gear (13) and the second gear (14) being directly meshed with each other or indirectly meshed with each other through at least one gear, and an outer diameter of the first gear (13) being larger than an outer diameter of the second gear (14); In the horizontal direction, the second inclined surface of the push block (6) is inclined from top to bottom along the direction from left to right, and the second inclined surface is twisted, and the right end of the push block (6) is inclined from top to bottom along the direction from back to front; in the horizontal direction, the first inclined surface of the torque adjustment block (5) is inclined from top to bottom along the direction from left to right, and the first inclined surface is twisted, and the right end of the torque adjustment block (5) is inclined from top to bottom along the direction from back to front.

2. The torsion spring torque adjustment structure according to claim 1 is characterized in that: A third groove (15) is provided at the middle of the upper end of the torque adjustment block (5); and a fourth groove (16) is provided at the middle of the lower end of the push block (6).

3. The torsion spring torque adjustment structure according to claim 1 is characterized in that: Two support columns (17) are provided on one end of the swing block (1) away from the torque adjustment block (5) and extending along the axial direction of the spindle (4); the support columns (17) are sleeved on the spindle (4), and the outer diameter of the support columns (17) is less than or equal to the inner diameter of the torsion spring (3).

4. The torsion spring torque adjustment structure according to claim 1 is characterized in that: An arc-shaped groove (7) is provided at a position of the torque adjustment block (5) in contact with the torsion spring (3); one end of the torsion spring (3) is movably mounted at the lower end of the torque adjustment block (5) and embedded in the arc-shaped groove (7).

5. A tray for a chair, characterized by: It comprises a torsion spring torque adjustment structure as described in any one of claims 1 to 4, wherein one end of the torsion spring (3) is movably mounted on a torque adjustment block (5), the other end of the torsion spring (3) is connected to a chair back swing assembly, the left and right ends of the spindle (4) are respectively rotatably connected or fixedly connected to a tray, and the screw (2) is rotatably connected to the tray.

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