Chair seat adjusting device

Abstract

A chair seat adjusting device is characterized in that a chair seat is divided into a base and a movable seat which can relatively move back and forth, a rack and a clamping block with clamping teeth are arranged between the contact surfaces of the movable seat and the base respectively, and a user can drive the clamping block to be separated from the rack or clamped with the rack through a driver at the bottom of the side edge of the movable seat; therefore, the front-back position of the movable seat is adjusted and fixed. The chair seat adjusting device is simple in structure, but can effectively and conveniently adjust the position of the movable seat, so that the use requirements of different crowds are met, and the use comfort is improved.

Description

Technical Field

[0001] The utility model relates to a chair, in particular to a device on the chair for adjusting the front and rear positions of a seat. Background Art

[0002] A chair is one of the most commonly used furnitures. A chair includes a seat for sitting, a leg installed at the bottom of the seat, a backrest connected to the back of the seat, and armrests arranged on both sides of the seat. In order to overcome the shortcomings of traditional fixed chairs and meet the needs of people of different physiques, people are increasingly using adjustable chairs, such as chairs with adjustable backrest inclination angles, chairs with adjustable leg heights, chairs with retractable armrests, or chairs with retractable footrests. These different types of chairs can not only meet the riding requirements of different people, but can even meet the needs of relaxation and sleep, greatly improving the applicability and comfort of use. However, the relative position between the seat and the bottom of the backrest of the existing adjustable chairs is still fixed. Even if the inclination angle of the backrest is adjustable, it is still difficult to meet the needs of specific groups of people. For example, for users with larger bodies, it will be difficult to meet their riding needs when the seat area is relatively limited; for another example, when the user needs to lie down and tilt the backrest, the buttocks will move forward appropriately, but this will lead to a lack of effective support for the waist and back, causing physical discomfort. Utility Model Content

[0003] The utility model aims to provide an adjusting device which can change the front and rear position of a chair seat relative to a chair back so as to expand the adjustment range of the chair and improve the comfort and applicability of the chair.

[0004] The seat adjustment device described in the utility model comprises a base connected to a chair back or a chair leg, and a movable seat movably mounted on the base, one of the base or the movable seat is provided with a rack and the other is provided with a clamping block, the clamping block is provided with a clamping tooth which can be clamped into the rack, the clamping block is also connected to an elastic member which exerts a force directed to the rack, and there is also a driver which connects the clamping block and drives the clamping tooth to disengage from the rack.

[0005] Furthermore, the rack is arranged on the bottom surface of the movable seat, a mounting seat is fixedly mounted on the base, a guide groove facing the rack is opened on the mounting seat, and a clamping block is arranged in the guide groove; the elastic member is a spring, and the spring is arranged between the bottom of the guide groove and the clamping block.

[0006] Furthermore, the driver includes a pull cable and an adjustment handle, one end of the pull cable is connected to the adjustment handle, and the other end of the pull cable passes through the mounting seat, extends into the guide groove and is connected to the clamping block.

[0007] Furthermore, the adjustment handle is arranged on the side of the movable seat.

[0008] Furthermore, the mounting seat is arranged at the bottom of the base, and a positioning cylinder is also provided at the bottom of the mounting seat. The positioning cylinder is provided with a positioning hole connected to the guide groove, and the sides of the mounting seat and the positioning cylinder are provided with threading grooves connected to the guide groove and the positioning hole; a recessed positioning recess is provided in the middle of the clamping block, and a positioning groove connected to the positioning recess and opposite to the threading groove is provided on the side of the clamping block; the end of the cable is provided in the positioning cylinder and has a diameter larger than the threading groove, and the end of the cable is also connected to the positioning block through a pull wire, the diameter of the pull wire is smaller than the threading groove and one end is provided in the positioning groove, and the positioning block is provided in the positioning recess.

[0009] Furthermore, the spring is sleeved outside the pull wire and two ends thereof are respectively against the bottom of the guide groove and the clamping block.

[0010] Furthermore, a through slot is formed on the movable seat, and the direction of the through slot is parallel to the rack. There is also an elastic reset member for driving the movable seat to move toward the chair back, and the elastic reset member is connected between the through slot and the base.

[0011] Furthermore, the elastic return member is a tension spring, a hook is provided at one end of the through slot away from the chair back, one end of the tension spring is connected to the hook and the other end is fixed to the base by a screw; or, the elastic return member is a compression spring, a recessed compression groove is provided at one end of the through slot close to the chair back, one end of the compression spring is arranged in the compression groove and the other end is fixed to the base by a screw.

[0012] Furthermore, a guide groove parallel to the through groove is formed on the movable seat, and a guide rod fixedly connected to the base is installed in the guide groove.

[0013] Furthermore, the through groove and the guide groove are both arranged through the movable seat from top to bottom, and there is a cover plate covering the through groove and the guide groove.

[0014] The seat adjustment device described in the utility model can be fixedly connected to the backrest or the foot of the chair, for example, the back side of the base is connected to the backrest or is integrally arranged, or the bottom of the base is fixedly connected to the liftable foot assembly; the movable seat is made into a supporting member for sitting, which can move relative to the base in the front-back direction, so that the movable seat is away from the backrest or close to the backrest, thereby changing the relative distance between the sitting position and the backrest, and when the seat is moved away from the backrest for adjustment, the seating space of the chair can be increased, and a smoother transition can be formed with the seat after the backrest is tilted, thereby meeting the use needs of different groups of people and improving the comfort of use. A rack and a clamping block are relatively arranged between the base and the movable seat. When the seat needs to be adjusted, the clamping block is driven by the driver to move away from the rack, so that the clamping teeth on the clamping block are separated from the gap between the adjacent teeth on the rack; then, by pulling the movable seat forward and backward to an appropriate position, and then releasing the driver, the clamping block is clamped with the rack again under the action of the rebound force of the elastic member, and the operation is simple and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 , 2 It is a structural schematic diagram of a seat adjustment device.

[0016] Figure 3 It is a schematic diagram of the connection structure between the moving seat and the elastic reset member.

[0017] Figure 4 , 5 It is a schematic diagram of the connection structure of the mounting base, the card block and the driver. DETAILED DESCRIPTION

[0018] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0020] If there are descriptions involving "first" or "second" in the embodiments of the utility model, the descriptions of "first" or "second" are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0021] The utility model provides a chair seat adjusting device.

[0022] The seat adjustment device of this embodiment includes a base 1 connected to a chair back or a chair leg, and a movable seat 2 movably mounted on the base 1. One of the base 1 or the movable seat 2 is provided with a rack 3 and the other is provided with a clamping block 4. The clamping block 4 is provided with a clamping tooth 5 that can be clamped into the rack 3. The clamping block 4 is also connected to an elastic member 6 that applies a force to the rack 3. There is also a driver connected to the clamping block 4 and drives the clamping tooth 5 to disengage from the rack 3.

[0023] The seat adjustment device described herein can have a base that is fixedly connected to a chair back or a chair leg, for example, the back side of the base is connected to or integrally arranged with the chair back, or the bottom of the base is fixedly connected to a liftable chair leg assembly; the movable seat is made into a supporting member for sitting, which can be moved in the front and rear directions relative to the base, so that the movable seat is away from the chair back or close to the chair back, thereby changing the relative distance between the sitting position and the chair back. When moving away from the chair back for adjustment, the seating space of the chair can be increased, and a smoother transition can be formed with the chair seat after the chair back is tilted, thereby meeting the use needs of different groups of people and improving the comfort of use.

[0024] The seat adjustment device has a rack 3 disposed on the bottom surface of the movable seat 2, a mounting seat 11 fixedly mounted on the base 1, a guide groove 12 facing the rack 3 is formed on the mounting seat 11, and a block 4 is disposed in the guide groove; the elastic member 6 is a spring disposed between the bottom of the guide groove 12 and the block 4. The driver includes a cable 7 and an adjustment handle 8, one end of the cable 7 is connected to the adjustment handle 8, and the other end passes through the mounting seat 11 and extends into the guide groove 12 and is connected to the block 4. The adjustment handle 8 is arranged on the side of the movable seat 2, and the mounting seat 11 is arranged on the bottom of the base 1. The bottom of the mounting seat 11 is also provided with a positioning cylinder 13, which is provided with a positioning hole connected to the guide groove 12, and the sides of the mounting seat 11 and the positioning cylinder 13 are provided with a threading groove 14 connected to the guide groove 12 and the positioning hole; at the same time, the middle of the clamping block 4 is provided with a recessed positioning concave platform 41, and the side of the clamping block 4 is provided with a positioning groove 42 connected to the positioning concave platform 41 and opposite to the threading groove 14; and the end of the cable 7 is arranged in the positioning cylinder 13 and has a diameter larger than the threading groove 14, and the end of the cable 7 is also connected to the positioning block 72 through the cable 71, the diameter of the cable 71 is smaller than the threading groove 14 and one end is arranged in the positioning groove 42, and the positioning block 72 is arranged in the positioning concave platform 41. In addition, a spring is sleeved outside the cable 71 and its two ends are respectively against the bottom of the guide groove 12 and the clamping block 4.

[0025] The spring provides elastic force to the clamping block to press the rack, so that the clamping block and the rack are clamped to each other, and the base and the moving seat are relatively fixed. This structure is relatively simple and compact, and can be conveniently set in the base. When adjustment is required, the user pulls the cable through the adjustment handle on one side of the moving seat, and the other end of the cable pulls the clamping block through the pull wire and the positioning block, thereby driving the clamping block to separate from the rack of the moving seat. At this time, adjustment can be made. After the adjustment is completed and the adjustment handle is released, the clamping block is reset and clamped into the rack under the drive of the spring, and the moving seat is re-fixed; this driving structure is simple and compact, and the pull wire can be conveniently hidden in the moving seat, which greatly improves the convenience of arrangement, and the adjustment operation of the seat is also extremely convenient.

[0026] In the seat adjustment device, a through slot 21 is provided on the movable seat 2, and the direction of the through slot 21 is parallel to the rack 3. There is also an elastic reset member 9 for driving the movable seat 2 to move toward the backrest, and the elastic reset member is connected between the through slot 21 and the base 1. The elastic reset member 9 can be a tension spring, and a hook 22 is provided at the end of the through slot 21 away from the backrest, one end of the tension spring is connected to the hook 22 and the other end is fixed to the base 1 by a screw 23; a compression spring can also be used as the elastic reset member 9, and a concave compression groove is provided at the end of the through slot 21 close to the backrest, one end of the compression spring is arranged in the compression groove and the other end is fixed to the base 1 by a screw 23. At the same time, a guide groove 24 parallel to the through slot 21 is also provided on the movable seat 2, and a guide rod 25 fixedly connected to the base 1 is installed in the guide groove 24; the through slot 21 and the guide slot 24 are both arranged from top to bottom through the movable seat 2, and there is also a cover plate 26 covering the through slot 21 and the guide slot 24.

[0027] When the moving seat needs to be readjusted inward after moving outward, the user drives the block to disengage from the rack through the driver. When the user does not apply an outward force to the moving seat, the moving seat can move inward under the resilience of the elastic reset member, thereby improving the convenience of operation. The elastic reset member can be a tension spring or a compression spring, and the moving seat is driven to move by the tension of the tension spring or the thrust of the compression spring. The structure is simple and easy to assemble and disassemble. The setting of the guide groove can improve the movement accuracy of the moving seat and avoid misalignment. At the same time, the elastic reset member, screws and guide rods are protected by the cover plate.

[0028] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A seat adjustment device, characterized in that: The invention comprises a base (1) connected to a chair back or a chair leg, and a movable seat (2) movably mounted on the base (1), wherein one of the base (1) or the movable seat (2) is provided with a rack (3) and the other is provided with a clamping block (4), wherein the clamping block (4) is provided with a clamping tooth (5) which can be clamped into the rack (3), and the clamping block (4) is also connected to an elastic member (6) which applies a force directed to the rack (3), and further comprises a driver connected to the clamping block (4) and driving the clamping tooth (5) to be separated from the rack (3).

2. The seat adjustment device according to claim 1, characterized in that: The rack (3) is arranged on the bottom surface of the movable seat (2); a mounting seat (11) is fixedly mounted on the base (1); a guide groove (12) facing the rack (3) is formed on the mounting seat (11); a clamping block (4) is arranged in the guide groove; and the elastic member (6) is a spring, which is arranged between the bottom of the guide groove (12) and the clamping block (4).

3. The seat adjustment device according to claim 2, characterized in that: The driver comprises a pull cable (7) and an adjustment handle (8); one end of the pull cable (7) is connected to the adjustment handle (8), and the other end of the pull cable (7) passes through the mounting seat (11), extends into the guide groove (12) and is connected to the clamping block (4).

4. The seat adjustment device according to claim 3, characterized in that: The adjustment handle (8) is arranged on the side of the movable seat (2).

5. The seat adjustment device according to claim 3, characterized in that: The mounting seat (11) is arranged at the bottom of the base (1), and a positioning cylinder (13) is also arranged at the bottom of the mounting seat (11). The positioning cylinder has a positioning hole connected to the guide groove (12), and the sides of the mounting seat (11) and the positioning cylinder (13) have a threading groove (14) connected to the guide groove (12) and the positioning hole; a recessed positioning recess (41) is arranged in the middle of the clamping block (4), and a positioning groove (42) connected to the positioning recess (41) and opposite to the threading groove (14) is arranged on the side of the clamping block (4); the end of the cable (7) is arranged in the positioning cylinder (13) and has a diameter larger than the threading groove (14), and the end of the cable (7) is also connected to the positioning block (72) through a pull wire (71), the diameter of the pull wire (71) is smaller than the threading groove (14) and one end is arranged in the positioning groove (42), and the positioning block (72) is arranged in the positioning recess (41).

6. The seat adjustment device according to claim 5, characterized in that: The spring is sleeved outside the pull wire (71) and its two ends respectively abut against the bottom of the guide groove (12) and the clamping block (4).

7. The seat adjustment device according to any one of claims 1 to 6, characterized in that: The movable seat (2) is provided with a through slot (21), and the direction of the through slot (21) is parallel to the rack (3). There is also an elastic reset member (9) for driving the movable seat (2) to move toward the chair back, and the elastic reset member is connected between the through slot (21) and the base (1).

8. The seat adjustment device according to claim 7, characterized in that: The elastic return member (9) is a tension spring, and a hook (22) is provided at one end of the through slot (21) away from the chair back, one end of the tension spring is connected to the hook (22) and the other end is fixed to the base (1) by a screw (23); or, the elastic return member (9) is a compression spring, and a recessed compression groove is provided at one end of the through slot (21) close to the chair back, one end of the compression spring is arranged in the compression groove and the other end is fixed to the base (1) by a screw (23).

9. The seat adjustment device according to claim 7, characterized in that: The movable seat (2) is provided with a guide groove (24) parallel to the through groove (21), and a guide rod (25) fixedly connected to the base (1) is installed in the guide groove (24).

10. The seat adjustment device according to claim 9, characterized in that: The through groove (21) and the guide groove (24) are both arranged to pass through the movable seat (2) from top to bottom, and a cover plate (26) is provided to cover the through groove (21) and the guide groove (24).

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