Seat support unit adjustment mechanism and seat

Abstract

This utility model discloses an adjustment mechanism for a seat support unit and a seat. The adjustment mechanism for the seat support unit includes a fixed base, a first movable base, a second movable base, and a drive assembly. The first movable base is mounted on the fixed base, and the second movable base is mounted on the first movable base. The output end of the drive assembly is synchronously connected to a first screw extending in the front-rear direction. The first movable base has a first threaded hole, and the first screw passes through the first threaded hole. A second screw is fixed on the first movable base, and the second screw is sleeved outside the first screw so that a second nut can rotate synchronously with the first screw and the second screw has a degree of freedom of movement relative to the first screw along its extension direction. The second movable base has a second threaded hole, and the second screw passes through the second threaded hole. This utility model is retractable, allowing the adjustment mechanism to have a relatively small size, and the support unit can be adjusted within a large range of strokes.

Description

Technical Field

[0001] This utility model relates to the field of seat technology, specifically to an adjustment mechanism for a seat support unit and a seat. Background Technology

[0002] To enhance seating comfort, some office chairs, gaming chairs, and study chairs are typically equipped with adjustable headrests, lumbar support pillows, and other support units to support the user's body. However, due to limited space on the chair, the adjustment range of these support units is relatively limited. For example, in existing headrest adjustment mechanisms, the headrest assembly is mounted on top of the backrest support, and the adjustment mechanism cannot extend to the back of the backrest support. Furthermore, the limited space on the front side of the backrest support results in a small range of fore-and-aft adjustment for the headrest, making it difficult to accommodate different sitting postures. Utility Model Content

[0003] The purpose of this utility model is to provide an adjustment mechanism for a seat support unit and a seat, which can increase the stroke of the support unit while ensuring that the adjustment mechanism has a small size.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The adjustment mechanism of the seat support unit includes a fixed seat, a first movable seat, a second movable seat, and a drive assembly;

[0006] The first movable seat is mounted on the fixed seat and can move relative to the fixed seat in the front-back direction; the second movable seat is mounted on the first movable seat and can move relative to the first movable seat in the front-back direction.

[0007] The output end of the drive component is synchronously connected to a first screw extending in the front-rear direction. A first threaded hole is provided on the first movable seat. The first screw passes through the first threaded hole so that the threads of the first screw and the threads of the first threaded hole cooperate with each other.

[0008] A second screw is fixed on the first movable seat. The second screw is sleeved outside the first screw so that the second nut can rotate synchronously with the first screw and the second screw has the freedom to move relative to the first screw along the extension direction of the first screw. A second threaded hole is provided on the second movable seat, and the second screw passes through the second threaded hole so that the threads of the second screw and the threads of the second threaded hole cooperate with each other.

[0009] Preferably, the second screw is provided with a mounting hole extending forward from its rear end face. The cross-section of the mounting hole is a non-rotating body. The first screw passes through the rear end of the mounting hole and slides into the mounting hole. The cross-sectional shape of the first screw is consistent with the cross-sectional shape of the mounting hole.

[0010] Preferably, the cross-section of the mounting hole is square, oblong, or elliptical.

[0011] Preferably, the fixed base is provided with a first slide groove extending rearward from its front end, and the first movable base is slidably embedded in the first slide groove; the drive assembly is installed in the fixed base, and the first screw passes through the rear end face of the first slide groove and is placed in the first slide groove.

[0012] Preferably, a first wear-resistant bushing is provided between the inner wall of the first slide groove and the outer surface of the first movable seat. The first wear-resistant bushing is fixedly fitted with the fixed seat. A first limiting groove extending in the front-rear direction is provided on the outer surface of the first movable seat. A first limiting protrusion that slides and is embedded in the first limiting groove is provided on the first wear-resistant bushing.

[0013] Preferably, a rear cover is provided on the rear side of the fixed base and is detachably connected to the fixed base. The rear cover and the fixed base form an installation cavity. The drive assembly is placed in the installation cavity and includes a motor and a reducer. The input end of the reducer is connected to the motor shaft, and the rear end of the first screw is connected to the output end of the reducer.

[0014] Preferably, the first movable seat is provided with a second sliding groove extending rearward from its front end, and the second movable seat is slidably embedded in the second sliding groove; a mounting wall is formed on the first movable seat at the rear end of the second sliding groove, the second screw is placed in the second sliding groove, and its rear end is fixed to the mounting wall; a nut set outside the first screw is fixedly connected to the rear side of the mounting wall, and a first threaded hole is provided on the nut.

[0015] Preferably, the rear end of the second screw is detachably fixed to the mounting wall, and the interior of the second movable seat is provided with a sleeve integrally formed with the second movable seat, and the second threaded hole is provided on the sleeve.

[0016] Preferably, a second wear-resistant bushing is provided between the inner wall of the second slide groove and the outer surface of the second movable seat. The second wear-resistant bushing is fixedly fitted with the first movable seat. A second limiting groove extending in the front-rear direction is provided on the outer surface of the second movable seat. A second limiting protrusion that slides and is embedded in the second limiting groove is provided on the second wear-resistant bushing.

[0017] The seat includes the adjustment mechanism of the aforementioned seat support unit.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] In this invention, the first movable seat and the fixed seat, and the second movable seat and the first movable seat each form a telescopic structure, thus forming a two-section telescopic structure. Under the drive of the drive component, the two telescopic structures extend or retract simultaneously. In the retracted state, the fixed seat, the first movable seat, and the second movable seat can retract together to form a relatively short whole, making the adjustment mechanism relatively small in size. When the adjustment mechanism moves from the retracted state to the extended state, the support unit located on the second movable seat can move a relatively long distance, allowing the support unit to be adjusted within a large stroke range. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a cross-sectional view of the present invention;

[0022] Figure 3 This is a schematic diagram of one working state of the present invention;

[0023] Figure 4 for Figure 1 A schematic diagram of the fit between the first screw and the second screw;

[0024] Figure 5 for Figure 1 A schematic diagram of the structure of the second movable seat.

[0025] Wherein: 10, fixed seat; 101, first slide groove; 11, first wear-resistant bushing; 111, first limiting protrusion; 12, rear cover; 20, first movable seat; 201, second slide groove; 202, mounting wall; 21, first limiting groove; 22, second wear-resistant bushing; 221, second limiting protrusion; 23, nut; 30, second movable seat; 31, second limiting groove; 32, sleeve; 41, motor; 42, reducer; 50, first screw; 60, second screw; 601, pressure seat; 602, connecting flange; 61, mounting hole. Detailed Implementation

[0026] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are all commercially available. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0027] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship 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 on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] like Figure 1 , 2 As shown in Figures 3, 4, and 5, this utility model provides an adjustment mechanism for a seat support unit, particularly an adjustment mechanism for a seat headrest. Specifically, it includes a fixed seat 10, a first movable seat 20, a second movable seat 30, and a drive assembly. The fixed seat 10 can be fixed to the top of the seat back support, and the headrest is connected to the second movable seat 30. The front-back position of the headrest can be adjusted by moving the second movable seat 30 and the first movable seat 20 in the front-back direction.

[0030] The first movable seat 20 is movably mounted on the fixed seat 10, allowing the first movable seat 20 to move relative to the fixed seat 10 in the front-back direction. The second movable seat 30 is movably mounted on the first movable seat 20, allowing the second movable seat 30 to move relative to the first movable seat 20 in the front-back direction. Thus, the fixed seat 10, the first movable seat 20, and the second movable seat 30 form a two-section telescopic structure. The first movable seat 20 and the second movable seat 30 are driven to move back and forth by a drive assembly. The output end of the drive assembly is synchronously connected to a first screw 50. The extension direction of the first screw 50 is consistent with the front-back direction. The first movable seat 20 is provided with a first threaded hole, and the first screw 50 passes through the first threaded hole. The threads of the first screw 50 and the threads of the first threaded hole cooperate with each other. The drive assembly drives the first screw 50 to rotate, thereby allowing the first movable seat 20 to move relative to the fixed seat 10 in the front-back direction.

[0031] A second screw 60 is fixedly connected to the first movable seat 20. The second screw 60 is sleeved on the first screw 50. After the second screw 60 and the first screw 50 are sleeved, the second screw 60 can rotate synchronously with the first screw 50, and the second screw 60 has the freedom of movement relative to the first screw 50 in the extension direction (i.e., the front-back direction). That is to say, during the synchronous rotation of the second screw 60 with the first screw 50, when the second screw 60 is subjected to a force in the front-back direction, the second screw 60 can... The second screw 60 moves in the front-back direction relative to the first screw 50. Thus, when the first screw 50 and the first threaded hole push the first movable seat 20 to move back and forth, the second screw 60 can move back and forth with the first movable seat 20 relative to the first screw 50. The second movable seat 30 is provided with a second threaded hole, and the second screw 60 passes through the second threaded hole. The threads of the second screw 60 and the threads of the second threaded hole cooperate with each other. When the second screw 60 rotates, the second movable seat 30 can move relative to the first movable seat 20 in the front-back direction.

[0032] It should be noted that the above description of the present invention is based on a headrest as a specific embodiment only. The support unit of the present invention is not limited to the headrest mentioned above. It can also be a lumbar support or backrest on a seat or other components used to support the user's body.

[0033] See Figure 2 As shown, the first movable seat 20 retracts into the fixed seat 10, and the second movable seat 30 retracts into the first movable seat 20. The headrest is mounted on the second movable seat 30. When the headrest needs to be adjusted forward, the drive assembly drives the first screw 50 to rotate. The first screw 50 engages with the first threaded hole, causing the first movable seat 20 to move forward relative to the fixed seat 10. Simultaneously, the second screw 60 rotates synchronously with the first screw 50. By engaging with the second threaded hole, the second movable seat 30 moves forward relative to the first movable seat 20. In this way, the headrest can be adjusted forward to the desired position. Figure 3 The state shown.

[0034] In this invention, the first movable seat 20 and the fixed seat 10, and the second movable seat 30 and the first movable seat 20 respectively form a telescopic structure, thus forming a two-section telescopic structure. Under the drive of the drive component, the two telescopic structures extend or retract simultaneously. In the retracted state, the fixed seat 10, the first movable seat 20, and the second movable seat 30 can retract together to form a relatively short whole, so that the adjustment mechanism has a relatively small size. When the adjustment mechanism moves from the retracted state to the extended state, the support unit located on the second movable seat 30 can move a relatively long distance, so that the support unit can be adjusted within a large stroke range.

[0035] In a preferred embodiment, the second screw 60 is provided with a mounting hole 61 extending forward from its rear end. The cross-section of the mounting hole 61 is configured as a non-rotational body. The first screw 50 is inserted into the mounting hole 61 from the rear end of the mounting hole 61, and the first screw 50 is slidably engaged with the mounting hole 61. The cross-sectional shape of the first screw 50 is consistent with the cross-sectional shape of the mounting hole 61. That is to say, the cross-sections of the two are non-rotational bodies with consistent shapes.

[0036] Specifically, the cross-section of the mounting hole 61 is set to be waist-shaped, and the cross-section of the first screw 50 is also waist-shaped. The first screw 50 can be manufactured in the following way: First, a conventional screw with a circular cross-section is selected, and the two sides of the screw are cut to form a plane, thus forming the first screw 50. The two planes on both sides of the first screw 50 fit together with the two sides of the waist-shaped cross-section of the mounting hole 61, so that when the first screw 50 rotates, the second screw 60 can rotate with the first screw 50. The second screw 60 also has the freedom of movement relative to the first screw 50 in the front-back direction. By setting the first screw 50 to the above structure, although the integrity of the threads on the first screw 50 will be partially damaged, it will not affect the interaction between the threads on the first screw 50 and the threads inside the first threaded hole. In other embodiments, without affecting the interaction between the threads on the first screw 50 and the threads inside the first threaded hole, the cross-section of the mounting hole 61 can be set to square or elliptical, or a keyway can be provided on the first screw 50, and a corresponding protruding key embedded in the keyway can be provided on the inner wall of the mounting hole 61.

[0037] The fixed base 10 is provided with a first slide groove 101 extending rearward from its front end. The first movable base 20 is slidably embedded in the first slide groove 101. The drive assembly is installed inside the fixed base 10. The first screw 50 passes through the rear end face of the first slide groove 101 and is placed in the first slide groove 101. The first slide groove 101 accommodates the first movable base 20 and guides the front-back movement of the first movable base 20, so that the first movable base 20 only has the freedom of movement relative to the fixed base 10 in the front-back direction.

[0038] A first wear-resistant bushing 11 is provided between the inner wall of the first slide groove 101 and the outer surface of the first movable seat 20. The first wear-resistant bushing 11 is fixedly engaged with the fixed seat 10. A first limiting groove 21 is provided on the outer surface of the first movable seat 20. The first limiting groove 21 extends in the front-back direction. A first limiting protrusion 111 is provided on the first wear-resistant bushing 11 and is slidably embedded in the first limiting groove 21. The first limiting protrusion 111 slides between the front end and the rear end of the first limiting groove 21 to limit the maximum stroke of the first movable seat 20 relative to the fixed seat 10, prevent the first movable seat 20 from pressing the fixed seat 10 when it moves backward, and prevent the first movable seat 20 from disengaging from the first slide groove 101 of the fixed seat 10 when it moves forward.

[0039] A rear cover 12 is provided on the rear side of the fixed base 10. The rear cover 12 is detachably fixed to the fixed base 10, and the rear cover 12 and the fixed base 10 form a mounting cavity. The drive assembly is installed in the mounting cavity, which includes a motor 41 and a reducer 42. The input end of the reducer 42 is connected to the rotating shaft of the motor 41, and the rear end of the first screw 50 is connected to the output end of the reducer 42. The reducer 42 reduces the speed and increases the torque of the output end of the motor 41, so that the first screw 50 can drive the first movable seat 20 to move back and forth relatively smoothly.

[0040] The first movable seat 20 is provided with a second sliding groove 201 extending rearward from its front end. The second movable seat 30 is slidably embedded in the second sliding groove 201. The second sliding groove 201 accommodates the second movable seat 30 and guides it, so that the second movable seat 30 only has the freedom of movement relative to the first movable seat 20. A mounting wall 202 is formed on the first movable seat 20 at the rear end of the second sliding groove 201. The second screw 60 is located in the second sliding groove 201, and the rear end of the second screw 60 is fixed to the mounting wall 202. A nut 23 is fixed on the rear side of the mounting wall 202. A first threaded hole is provided on the nut 23. In order to prevent the nut 23 from protruding from the rear side of the mounting wall 202 and to facilitate the installation of the nut 23, a groove is provided on the rear side of the mounting wall 202. The nut 23 is embedded into the groove from the rear end of the first movable seat 20, so that the nut 23 is fixedly engaged with the first movable seat 20.

[0041] For ease of assembly, the rear end of the second screw 60 is detachably fixed to the mounting wall 202. Inside the second movable seat 30, a sleeve 32 integrally formed with the second movable seat 30 is provided, and the second threaded hole is provided on the sleeve 32. During assembly, the second screw 60 is first screwed into the sleeve 32, and the assembly formed by the second screw 60 and the second movable seat 30 is inserted into the second slide groove 201 from the front end of the second slide groove 201. Then, the second screw 60 is fixed to the mounting wall 202.

[0042] A connecting flange 602 is provided protruding from the rear end of the second screw 60. A pressure seat 601 is sleeved on the outside of the second screw 60. The pressure seat 601 is fixed to the mounting wall 202 by bolts. The connecting flange 602 is pressed by the pressure seat 601 and the mounting wall 202, so that the second screw 60 is fixed to the mounting wall 202.

[0043] A second wear-resistant bushing 22 is provided between the inner wall of the second slide groove 201 and the outer surface of the second movable seat 30. The second wear-resistant bushing 22 is fixedly engaged with the first movable seat 20. A second limiting groove 31 is provided on the outer surface of the second movable seat 30. The second limiting groove 31 extends in the front-back direction. A second limiting protrusion 221 is provided on the second wear-resistant bushing 22 and is slidably embedded in the second limiting groove 31. The second limiting protrusion 221 slides between the front end and the rear end of the second limiting groove 31 to limit the maximum stroke of the second movable seat 30 relative to the first movable seat 20, prevent the second movable seat 30 from pressing the first movable seat 20 when it moves backward, and prevent the second movable seat 30 from disengaging from the second slide groove 201 of the first movable seat 20 when it moves forward.

[0044] The seat of this utility model includes the adjustment mechanism of the aforementioned seat support unit. The other structures of the seat are the same as those in the prior art and will not be described in detail here.

[0045] Finally, it should be noted that the above embodiments are only optional embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. An adjustment mechanism for a seat support unit, characterized in that, Includes a fixed base, a first movable base, a second movable base, and a drive assembly; The first movable seat is mounted on the fixed seat and can move relative to the fixed seat in the front-back direction; the second movable seat is mounted on the first movable seat and can move relative to the first movable seat in the front-back direction. The output end of the drive component is synchronously connected to a first screw extending in the front-rear direction. A first threaded hole is provided on the first movable seat. The first screw passes through the first threaded hole so that the threads of the first screw and the threads of the first threaded hole cooperate with each other. A second screw is fixed on the first movable seat. The second screw is sleeved outside the first screw so that the second nut can rotate synchronously with the first screw and the second screw has the freedom to move relative to the first screw along the extension direction of the first screw. A second threaded hole is provided on the second movable seat, and the second screw passes through the second threaded hole so that the threads of the second screw and the threads of the second threaded hole cooperate with each other.

2. The adjustment mechanism of the seat support unit as described in claim 1, characterized in that, The second screw is provided with a mounting hole extending forward from its rear end. The cross-section of the mounting hole is a non-rotating body. The first screw passes through the rear end of the mounting hole and slides into the mounting hole. The cross-sectional shape of the first screw is consistent with the cross-sectional shape of the mounting hole.

3. The adjustment mechanism of the seat support unit as described in claim 2, characterized in that, The cross-section of the mounting hole is square, oblong, or elliptical.

4. The adjustment mechanism of the seat support unit as described in claim 1, characterized in that, The fixed base is provided with a first slide groove extending rearward from its front end, and the first movable seat is slidably embedded in the first slide groove; the drive assembly is installed in the fixed base, and the first screw passes through the rear end face of the first slide groove and is placed in the first slide groove.

5. The adjustment mechanism of the seat support unit as described in claim 4, characterized in that, A first wear-resistant bushing is provided between the inner wall of the first slide groove and the outer surface of the first movable seat. The first wear-resistant bushing is fixedly fitted with the fixed seat. A first limiting groove extending in the front-back direction is provided on the outer surface of the first movable seat. A first limiting protrusion that slides and is embedded in the first limiting groove is provided on the first wear-resistant bushing.

6. The adjustment mechanism of the seat support unit as described in claim 4, characterized in that, A rear cover is provided on the rear side of the fixed base and is detachably connected to the fixed base. The rear cover and the fixed base form a mounting cavity. The drive assembly is placed in the mounting cavity and includes a motor and a reducer. The input end of the reducer is connected to the motor shaft, and the rear end of the first screw is connected to the output end of the reducer.

7. The adjustment mechanism of the seat support unit as described in claim 1, characterized in that, The first movable seat is provided with a second slide groove extending rearward from its front end, and the second movable seat is slidably embedded in the second slide groove; a mounting wall is formed on the first movable seat at the rear end of the second slide groove, the second screw is placed in the second slide groove, and its rear end is fixed to the mounting wall; a nut set outside the first screw is fixedly connected to the rear side of the mounting wall, and a first threaded hole is provided on the nut.

8. The adjustment mechanism of the seat support unit as described in claim 7, characterized in that, The rear end of the second screw is detachably fixed to the mounting wall. The interior of the second movable seat is provided with a sleeve integrally formed with the second movable seat, and the second threaded hole is provided on the sleeve.

9. The adjustment mechanism of the seat support unit as described in claim 7, characterized in that, A second wear-resistant bushing is provided between the inner wall of the second slide groove and the outer surface of the second movable seat. The second wear-resistant bushing is fixedly fitted with the first movable seat. A second limiting groove extending in the front-back direction is provided on the outer surface of the second movable seat. A second limiting protrusion that slides and is embedded in the second limiting groove is provided on the second wear-resistant bushing.

10. A seat, characterized in that, The adjustment mechanism includes the seat support unit as described in any one of claims 1-9.

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