Telescopic mechanism and seat having the same

Abstract

The utility model discloses a telescopic mechanism and seat with the telescopic mechanism, telescopic mechanism includes fixed base, movable seat, locking assembly, movable seat sliding is installed on the fixed base, and a plurality of lock holes are arranged on movable seat, locking assembly includes lock pin, operating part, top block, first elastic part, second elastic part, lock pin is slidably installed on the fixed base to make lock pin can be connected in one of lock holes or separate from lock hole, first elastic part is arranged between fixed base and lock pin to exert the first elastic stress of moving away from movable seat to lock pin, and second elastic part is arranged between top block and lock pin to exert the second elastic stress of moving towards movable seat to lock pin, operating part is pivoted on the fixed base to make operating part can rotate relative to the fixed base between first position and second position, the utility model discloses simple and convenient operation process, can provide stable support for movable seat.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, specifically to a telescopic mechanism and a seat having the telescopic mechanism. Background Technology

[0002] Seats typically employ telescopic mechanisms to adjust the positions of support components such as lumbar support, headrest, and backrest, allowing them to accommodate different sitting postures. For example, some existing seats are equipped with an adjustable lumbar support assembly, which includes a fixed base mounted on the seat back support and a movable base mounted on the fixed base. The movable base can move relative to the fixed base in the forward and backward direction, forming a telescopic mechanism. The lumbar support is mounted on the movable base. To ensure that the lumbar support provides stable support to the user's lower back in different positions, a locking mechanism is usually also included, typically located on the fixed base. Install a horizontally retractable pin that passes through the fixed seat and the movable seat to lock the telescopic mechanism. The pin disengages from the movable seat, unlocking it from the fixed seat. In actual use, the user needs to pull the pin horizontally to unlock it. Since the user's arm has limited space to move horizontally, it is often difficult to pull the pin to the position where it is disengaged from the movable seat while maintaining a natural sitting posture, making the operation extremely inconvenient. Although the size of the pin entering the movable seat can be reduced to correspondingly reduce the displacement distance when the pin disengages from the movable seat, the small fit between the pin and the movable seat makes it difficult for the pin to stably support the backward pressure of the movable seat, often leading to abnormal backward movement of the lumbar support. Utility Model Content

[0003] The purpose of this utility model is to provide a telescopic mechanism and a seat having the telescopic mechanism, which provides stable support when locked and is convenient for the user to operate.

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

[0005] Telescopic mechanism, including fixed base, movable base, and locking assembly;

[0006] The movable seat is slidably mounted on the fixed seat, and the movable seat is provided with multiple locking holes;

[0007] The locking assembly includes a locking pin, an operating member, a top block, a first elastic member, and a second elastic member; the locking pin is movably mounted on a fixed base so that the locking pin can be inserted into or disengaged from one of the keyholes; the first elastic member is disposed between the fixed base and the locking pin to apply a first elastic stress away from the movable base to the locking pin, and the second elastic member is disposed between the top block and the locking pin to apply a second elastic stress toward the movable base to the locking pin; the operating member is pivotally connected to the fixed base so that the operating member can rotate relative to the fixed base between a first position and a second position;

[0008] When the operating member is in the first position, the operating member restricts the top block to the third position close to the movable seat, and the second elastic stress is greater than the first elastic stress; when the operating member is in the second position, the operating member restricts the top block to the fourth position far away from the movable seat, and the second elastic stress is less than the first elastic stress.

[0009] Preferably, a fixed sleeve is connected to the fixed base, and the first elastic element, locking pin, second elastic element, top block and operating element are all inserted into the fixed sleeve; the top block slides with the fixed sleeve so that the top block has the freedom to move between the third position and the fourth position.

[0010] Preferably, the operating component is sleeved on the top block and pivotally engaged with the top block. The operating component is provided with a boss extending toward the top block. The top block has a mating surface facing the operating component. On the mating surface, there is a groove and a locking groove recessed toward the movable seat. The groove and the locking groove are both V-shaped and staggered along the circumference of the top block. The depth of the groove is greater than the depth of the locking groove. When the boss is placed in the groove or the locking groove and the operating component is rotated, the boss abuts against the inclined surface of the side of the groove or the locking groove, causing the top block to move toward the movable seat while disengaging the boss from the groove or the locking groove. When the boss is placed in the locking groove, the top block is in the third position. When the boss is placed in the groove, the top block is in the fourth position.

[0011] Preferably, the top block is provided with a shaft head extending from the mating surface in a direction away from the movable seat, and the operating member is provided with a shaft hole, the shaft head passing through the shaft hole so that the operating member and the top block are pivotally mated.

[0012] Preferably, a guide groove is provided on one of the outer surface of the top block and the inner wall surface of the fixed sleeve, and a slider is provided on the other. The slider is slidably embedded in the guide groove so that the top block and the fixed sleeve slide together.

[0013] Preferably, one end of the fixing sleeve is detachably fixed to the fixing base, and the other end of the fixing sleeve is rotatably fitted with a rotating handle, which is detachably fixed to the operating component.

[0014] Preferably, a radially outward protruding flange is provided in the middle of the outer edge surface of the locking pin; the first elastic element is a first spring sleeved outside the locking pin, with the two ends of the first spring abutting against the fixing seat and the flange respectively; the second elastic element is a second spring sleeved outside the locking pin, with the two ends of the second spring abutting against the flange and the top block respectively.

[0015] Preferably, the fixed seat has a wear-resistant bushing installed inside, and a groove is defined by the wear-resistant bushing. The movable seat is slidably embedded in the groove, and the inner wall of the wear-resistant bushing is provided with supporting ribs that contact the surface of the movable seat.

[0016] Preferably, the top block is slidably fitted with the fixed seat, and a screw is fixedly connected to the operating part, with the top block sleeved on the screw and threadedly fitted with the screw.

[0017] The seat, including the aforementioned telescopic mechanism.

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

[0019] This invention changes the distance between the top block and the movable seat by rotating the operating component, thereby altering the relationship between the elastic stresses generated by the two elastic elements abutting the locking pin. This allows the locking pin to move between the position inserted into the lock hole and the position disengaged from the lock hole, achieving locking and unlocking of the movable seat and the fixed seat. When adjusting the relative position of the movable seat and the fixed seat, the user only needs to rotate the operating component, without needing to operate the operating component along the length of the locking pin, making the operation simple and convenient. By applying elastic stress to the locking pin in two different directions through the two elastic elements, the invention ensures that the locking pin can be stably inserted into the lock hole during locking, providing stable support for the movable seat. During unlocking, it ensures that the locking pin can be ejected from the lock hole, allowing the movable seat to move flexibly relative to the fixed seat. 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 and illustrates one usage state of the present invention;

[0022] Figure 3 This is a schematic diagram illustrating another usage state of the present invention;

[0023] Figure 4 for Figure 1 Schematic diagram of the structure of the center block and the operating component;

[0024] Figure 5 for Figure 4 A schematic diagram of a possible engagement state between the center block and the operating component;

[0025] Figure 6 for Figure 4 A schematic diagram of another engagement state between the center block and the operating component;

[0026] Figure 7 for Figure 1 A schematic diagram of the structure of the fixed sleeve.

[0027] Among them: 10, fixed seat; 11, fixed sleeve; 111, guide groove; 12, wear-resistant bushing; 13, slide groove; 14, support rib; 20, movable seat; 21, lock hole; 300, locking assembly; 30, locking pin; 31, flange; 40, first spring; 50, second spring; 60, top block; 61, mating surface; 62, groove; 63, locking groove; 64, shaft head; 65, slider; 70, operating component; 71, boss; 72, connecting end; 80, rotating handle. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] 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.

[0031] like Figure 1 , 2As shown in Figures 3, 4, 5, 6, and 7, this utility model discloses a telescopic mechanism that can be applied to a lumbar support assembly of a seat. The telescopic mechanism includes a fixed seat 10, a movable seat 20, and a locking assembly 300. The fixed seat 10 is connected to the backrest support of the seat, and the movable seat 20 is slidably mounted on the fixed seat 10 so that the movable seat 20 can move relative to the fixed seat 10 in the front-back direction. The lumbar support is mounted on the movable seat 20 so that it can move back and forth to adapt to different sitting postures of the user. The movable seat 20 is provided with multiple locking holes 21. When the lumbar support is adjusted to an appropriate position, the locking assembly 300 cooperates with the multiple locking holes 21 to lock the movable seat 20 and the fixed seat 10 to ensure that the lumbar support assembly can stably support the user's waist.

[0032] The locking assembly 300 includes a locking pin 30, an operating member 70, a top block 60, a first spring 40, and a second spring 50. The locking pin 30 is movably mounted on the fixed seat 10, allowing the locking pin 30 to move left and right relative to the fixed seat 10. This allows the locking pin 30 to move toward the movable seat 20 and then pass through one of the lock holes 21 to lock the movable seat 20 and the fixed seat 10. Additionally, the locking pin 30 can move away from the movable seat 20 and disengage from the lock hole 21 to unlock the movable seat 20 and the fixed seat 10. The first spring 40 is disposed between the fixed seat 10 and the locking pin 30, and can apply a first elastic stress F1 away from the movable seat 20 to the locking pin 30, that is, the first spring 40 always applies a first elastic stress F1 to the left to the locking pin 30. The second spring 50 is disposed between the top block 60 and the locking pin 30, and can apply a second elastic stress F2 towards the movable seat 20 to the locking pin 30, that is, the second spring 50 always applies a second elastic stress F2 to the right to the locking pin 30.

[0033] The operating member 70 is pivotally connected to the fixed base 10, allowing the operating member 70 to rotate relative to the fixed base 10 between a first position and a second position. When the operating member 70 is rotated, the distance between the top block 60 and the movable base 20 changes. That is, rotating the operating member 70 can trigger the top block 60, causing the top block 60 to move in the left and right directions. Since the top block 60 abuts against the end of the second spring 50 away from the locking pin 30, when the position of the top block 60 changes, the compression of the second spring 50 can be changed, thereby changing the magnitude of the second elastic stress F2 of the second spring 50.

[0034] When the operating member 70 is in the first position, it restricts the top block 60 to a third position close to the movable seat 20. At this time, because the top block 60 is close to the movable seat 20, the second spring 50 has a larger amount of contraction, and the second elastic stress F2 is greater than the first elastic stress F1. Thus, the locking pin 30 can be inserted into one of the lock holes 21. When the operating member 70 is in the second position, it restricts the top block 60 to a fourth position far away from the movable seat 20. At this time, because the top block 60 is far from the movable seat 20, the second spring 50 has a relatively smaller amount of contraction, and the second elastic stress F2 is less than the first elastic stress F1. Thus, the locking pin 30 can be disengaged from the lock hole 21.

[0035] It should be noted that the first spring 40 and the second spring 50 of this utility model can also be replaced by other elastic components such as spring sheets or elastic rubber blocks.

[0036] In this invention, by rotating the operating component 70, the distance between the top block 60 and the movable seat 20 is changed, causing a change in the magnitude of the elastic stress generated by the two elastic elements abutting against the locking pin 30. This allows the locking pin 30 to move between the position inserted into the lock hole 21 and the position disengaged from the lock hole 21, thereby achieving locking and unlocking of the movable seat 20 and the fixed seat 10. When adjusting the relative position of the movable seat 20 and the fixed seat 10, the user only needs to rotate the operating component 70, without needing to operate the operating component 70 along the length of the locking pin 30, making the operation simple and convenient. By applying elastic stress to the locking pin 30 in two different directions through the two elastic elements, during locking, the locking pin 30 can be stably inserted into the lock hole 21, providing stable support for the movable seat 20. During unlocking, the locking pin 30 can be ejected from the lock hole 21, allowing the movable seat 20 to move flexibly relative to the fixed seat 10.

[0037] In a preferred embodiment, to facilitate the installation of the locking assembly 300, a fixing sleeve 11 is connected to the fixing base 10. Specifically, the fixing sleeve 11 is fixed to the outside of one side of the fixing base 10, and its extension direction is consistent with the left and right direction. The first spring 40, locking pin 30, second spring 50, top block 60, and operating member 70 are all inserted inside the fixing sleeve 11. The top block 60 is configured to slide with the fixing sleeve 11, so that the top block 60 can have the freedom to move in the third and fourth positions inside the fixing sleeve 11. When the operating member 70 is rotated clockwise to the first position, the operating member 70 can push the top block 60 to move the top block 60 to the third position. When the operating member 70 is rotated counterclockwise to the second position, the operating member 70 avoids the top block 60, so that the top block 60 moves to the fourth position under the push of the second spring 50.

[0038] Specifically, the operating member 70 is configured to be sleeved on the top block 60 and pivotally engaged with the top block 60. When the two rotate relative to each other, the relative rotational motion is converted into relative displacement in the left and right directions by a reversing mechanism. Specifically, the operating member 70 is provided with a boss 71 extending toward the top block 60. The top block 60 has a mating surface 61 facing the operating member 70. On the mating surface 61, there is a groove 62 and a locking groove 63 recessed toward the movable seat 20. The groove 62 and the locking groove 63 are both V-shaped and staggered along the circumference of the top block 60. The depth of the groove 62 is greater than the depth of the locking groove 63. The groove 62 and the locking groove 63 are set as V-shaped so that both sides are inclined surfaces, and the reversing is achieved by using the inclined surfaces.

[0039] Specifically, when the boss 71 is placed in the groove 62 and the operating member 70 is rotated, the boss 71 is pushed by the inclined surface on the side of the groove 62, thereby converting the relative rotation of the boss 71 and the top block 60 into a linear relative movement, and finally the boss 71 disengages from the groove 62. Similarly, when the boss 71 is placed in the locking groove 63 and the operating member 70 is rotated, the boss 71 can disengage from the locking groove 63. The relative position of the operating member 70 and the fixing sleeve 11 in the left-right direction remains unchanged. Since the depth of the groove 62 is greater than the depth of the locking groove 63, such as Figure 5 As shown, when the boss 71 is placed in the groove 62, the distance between the top block 60 and the operating member 70 is the shortest, that is, the distance between the top block 60 and the movable seat 20 is the farthest. At this time, the top block 60 is in the fourth position, and the boss 71 cooperates with the locking groove 63 to limit the operating member 70 to the second position and prevent the operating member 70 from rotating abnormally. The operating member 70 will only rotate when the user rotates it; as shown Figure 6 As shown, when the boss 71 is placed in the slot 63, the distance between the top block 60 and the operating member 70 is the farthest. That is to say, the distance between the top block 60 and the movable seat 20 is the shortest. At this time, the top block 60 is pushed to the third position by the operating member 70, and the operating member 70 is limited to the first position by the cooperation of the boss 71 and the groove 62.

[0040] The top block 60 is provided with a shaft head 64 extending from the mating surface 61 in a direction away from the movable seat 20. The operating member 70 is provided with a shaft hole with an opening facing the top block 60, and the shaft head 64 passes through the shaft hole, so that the operating member 70 and the top block 60 are pivotally engaged. In other embodiments, the operating member 70 may be sleeved on the outside of the top block 60, and the boss 71 may be provided on the inner wall surface of the operating member 70. Alternatively, the top block 60 may be sleeved on the operating member 70, and the groove 62 and the locking groove 63 may be provided on the inner wall surface of the top block 60.

[0041] A slider 65 protrudes from the outer surface of the top block 60, and a guide groove 111 is provided on the inner wall of the fixed sleeve 11. The slider 65 is slidably embedded in the guide groove 111, allowing the top block 60 to slide in conjunction with the fixed sleeve 11. In other embodiments, the slider 65 can be disposed on the inner wall of the fixed sleeve 11, and the guide groove 111 can be disposed on the outer surface of the top block 60. By utilizing the cooperation between the slider 65 and the guide groove 111, the movement of the top block 60 in the left-right direction is guided, so that the top block 60 only has the degree of freedom to move relative to the fixed sleeve 11 in the left-right direction, preventing the top block 60 from rotating with the operating member 70 when the operating member 70 pushes it.

[0042] For ease of installation, one end of the fixing sleeve 11 is fixed to the side wall of the fixing base 10 by screws or other detachable connection methods. The other end of the fixing sleeve 11 is rotatably fitted with a rotating handle 80. The rotating handle 80 is detachably fixed together with the operating member 70. During assembly, the top block 60, the second spring 50, the locking pin 30, and the first spring 40 are sequentially inserted into the fixing sleeve 11 from one end of the fixing sleeve 11. The fixing sleeve 11 is then assembled onto the fixing base 10. The operating member 70 is inserted into the fixing sleeve 11 from the other end of the fixing sleeve 11. After the rotating handle 80 is fitted onto the other end of the fixing sleeve 11, the rotating handle 80 is fixedly connected to the connecting end 72 on the operating member 70 by screws or other detachable connection methods.

[0043] In order to better apply the elastic stress provided by the first spring 40 and the second spring 50 to the locking pin 30, a radially outward protruding flange 31 is provided in the middle of the outer edge surface of the locking pin 30. The first spring 40 is sleeved on the outside of the locking pin 30, so that the two ends of the first spring 40 abut against the fixing seat 10 and the flange 31 respectively. The second spring 50 is sleeved on the outside of the locking pin 30, so that the two ends of the second spring 50 abut against the flange 31 and the top block 60 respectively.

[0044] The fixed seat 10 is equipped with a wear-resistant bushing 12, which defines a sliding groove 13 that extends back and forth. The movable seat 20 is slidably embedded in the sliding groove 13. The inner wall of the wear-resistant bushing 12 is provided with a support rib 14 that contacts the surface of the movable seat 20. The wear-resistant bushing 12 is provided between the fixed seat 10 and the movable seat 20 to avoid wear caused by direct contact between the fixed seat 10 and the movable seat 20. The support rib 14 can reduce the contact area between the wear-resistant bushing 12 and the movable seat 20, so that the movable seat 20 can slide flexibly inside the sliding groove 13.

[0045] In this invention, the operating member 70 rotates between a first position and a second position so that the top block can be limited to a third position close to the movable seat 20 or a fourth position away from the movable seat 20. In other embodiments, a screw can be fixedly connected to the operating member, the top block can be sleeved on the screw and the top block can be threadedly engaged with the screw. Rotating the operating member can drive the top block closer to or away from the movable seat 20.

[0046] It should be noted that the telescopic mechanism of this utility model is not limited to the lumbar support assembly of the aforementioned seat, but can also be used in the headrest assembly, backrest assembly, and other adjustable structures of the seat.

[0047] The seat of this utility model includes the above-mentioned telescopic mechanism. The other structures of the seat are the same as those in the prior art and will not be described in detail here.

[0048] 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. A telescopic mechanism, characterized in that, Includes a fixed base, a movable base, and a locking assembly; The movable seat is slidably mounted on the fixed seat, and the movable seat is provided with multiple locking holes; The locking assembly includes a locking pin, an operating element, a top block, a first elastic element, and a second elastic element; the locking pin is movably mounted on a fixed base so that the locking pin can be inserted into or disengaged from one of the keyholes; The first elastic element is placed between the fixed seat and the locking pin to apply a first elastic stress away from the movable seat to the locking pin, and the second elastic element is placed between the top block and the locking pin to apply a second elastic stress toward the movable seat to the locking pin. The operating element is pivotally connected to the fixed base so that the operating element can rotate relative to the fixed base between a first position and a second position; When the operating member is in the first position, the operating member restricts the top block to the third position close to the movable seat, and the second elastic stress is greater than the first elastic stress; when the operating member is in the second position, the operating member restricts the top block to the fourth position far away from the movable seat, and the second elastic stress is less than the first elastic stress.

2. The telescopic mechanism as described in claim 1, characterized in that, A fixed sleeve is connected to the fixed base. The first elastic element, the locking pin, the second elastic element, the top block, and the operating element are all inserted into the fixed sleeve. The top block slides with the fixed sleeve so that the top block has the freedom to move between the third position and the fourth position.

3. The telescopic mechanism as described in claim 2, characterized in that, The operating component is fitted onto the top block and pivotally engaged with it. The operating component has a boss extending toward the top block. The top block has a mating surface facing the operating component. On the mating surface, there is a groove and a locking groove recessed toward the movable seat. Both the groove and the locking groove are V-shaped and staggered along the circumference of the top block. The depth of the groove is greater than the depth of the locking groove. When the boss is placed in the groove or the locking groove and the operating component is rotated, the boss abuts against the inclined surface on the side of the groove or the locking groove, causing the top block to move toward the movable seat while disengaging the boss from the groove or the locking groove. When the boss is placed in the locking groove, the top block is in the third position. When the boss is placed in the groove, the top block is in the fourth position.

4. The telescopic mechanism as described in claim 3, characterized in that, The top block is provided with a shaft head extending from the mating surface in a direction away from the movable seat. The operating member has a shaft hole, and the shaft head passes through the shaft hole so that the operating member and the top block can pivotally engage.

5. The telescopic mechanism as described in claim 2, characterized in that, A guide groove is provided on one of the outer surface of the top block and the inner wall of the fixed sleeve, and a slider is provided on the other. The slider is slidably embedded in the guide groove so that the top block and the fixed sleeve slide together.

6. The telescopic mechanism as described in claim 2, characterized in that, One end of the fixed sleeve is detachably fixed to the fixed base, and the other end of the fixed sleeve is rotatably fitted with a rotating handle, which is detachably fixed to the operating component.

7. The telescopic mechanism as described in claim 2, characterized in that, A radially outward protruding flange is provided in the middle of the outer edge surface of the locking pin. The first elastic element is a first spring sleeved on the outside of the locking pin, with the two ends of the first spring abutting against the fixed seat and the flange respectively. The second elastic element is a second spring sleeved on the outside of the locking pin, with the two ends of the second spring abutting against the flange and the top block respectively.

8. The telescopic mechanism as described in claim 1, characterized in that, The fixed seat has a wear-resistant bushing installed inside, which defines a groove. The movable seat is slidably embedded in the groove. The inner wall of the wear-resistant bushing is provided with supporting ribs that contact the surface of the movable seat.

9. The telescopic mechanism as described in claim 1, characterized in that, The top block slides into the fixed seat, and a screw is fixedly connected to the operating part. The top block is sleeved on the screw and threaded into the screw.

10. A seat, characterized in that, Includes the telescopic mechanism as described in any one of claims 1-9.

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