Chair headrest adjusting structure

Abstract

A chair headrest adjusting structure is characterized in that a lifter, a movable seat and a rotating frame are sequentially installed between a backrest and a headrest of a chair, the lifter can be adjusted in a lifting mode in the vertical direction, the movable seat can be adjusted front and back in the horizontal direction, and the axis of the hinged end between the rotating frame and the movable seat faces the two sides; the angle of the rotating frame and the angle of the headrest on the rotating frame can be adjusted, so that the headrest can be conveniently adjusted to different states through the arrangement of multiple degrees of freedom, the use requirements of different crowds are met, and the use comfort of the chair is greatly improved.

Description

Technical Field

[0001] The utility model relates to a chair, in particular to an adjustable structure of a headrest on the chair. Background Art

[0002] A chair is one of the most commonly used furniture in daily life. In order to meet the usage needs of people with different physiques and achieve better usage comfort, the headrest is often designed as a liftable structure. In existing chairs, an adjustment seat is generally fixedly installed at the top of the backrest, the headrest is installed on an adjustment rod, and a liftable adjustment structure is provided between the adjustment rod and the adjustment seat, and the adjustment is achieved by pulling the adjustment rod. Although this kind of chair can achieve adjustment, its adjustment function is relatively single and cannot meet the usage needs of different people. Content of the Utility Model

[0003] The purpose of the utility model is to provide a chair headrest structure that can be adjusted in the front-back direction to increase the adjustment range and better meet the usage needs.

[0004] The chair headrest adjustment structure described in the utility model includes a movable seat that can move back and forth, and an adjustment mechanism that drives the movable seat to move back and forth. A rotatable rotating frame is hinged at the front end of the movable seat, and a headrest for supporting the head is installed on the rotating frame; the movable seat includes a slider and a movable sleeve that can move back and forth outside the slider, and the rotating frame is connected to the movable sleeve; the adjustment mechanism includes a rack arranged on the movable sleeve in the front-back direction, a block is arranged on the slider and can be engaged with the rack, and a spring is installed between the block and the slider.

[0005] Further, there is a lifter that is liftably installed on the backrest of the chair, and the movable seat is installed on the lifter; the lifter includes a fixed seat that can be detachably installed on the backrest, a lifting groove is vertically opened on the fixed seat, and there is also a lifting adjustment rod that moves along the lifting groove. A wavy lifting adjustment groove is vertically provided on the lifting adjustment rod, and a locator is installed on the fixed seat opposite to the lifting adjustment groove.

[0006] Further, the movable sleeve includes an upper cover and a lower cover that are opposite to each other up and down and can be detachably connected. The rack is arranged at the bottom of the inner side of the upper cover, and a sliding groove is opened on the lower cover, and the slider is relatively slidably installed on the sliding groove.

[0007] Further, the teeth of the rack are inclined teeth that are inclined towards the front side and perpendicular to the back side, and the block is connected with a lever for driving it to disengage from the rack.

[0008] Further, the lever is rotatably installed on one side of the block on the movable sleeve, a groove is opened on the block, and a block extending into the groove is provided on the lever.

[0009] Further, a horizontally arranged angle adjustment rod is provided at the top of the lifting adjustment rod. The moving sleeve is clamped on the angle adjustment rod through a detachable clamping sleeve. The angle adjustment rod is provided with a wavy rotation adjustment groove along the circumferential direction, and a positioner is installed on the moving sleeve or the clamping sleeve and abuts against the rotation adjustment groove.

[0010] Further, an adjustment hole arranged horizontally is formed on the moving seat. The middle part of the rotating frame passes through the adjustment hole and is provided with a wavy pitch adjustment groove along the circumferential direction, and a positioner is installed on the moving seat and abuts against the pitch adjustment groove.

[0011] Further, the rotating frame includes a main rod connected to the moving seat, and a plurality of sub-rods are sequentially connected to both ends of the main rod.

[0012] Further, the headrest is hinged to the rotating frame.

[0013] For the headrest adjustment structure of the chair described in the present utility model, the rotating frame installed with the headrest is connected to a moving seat, and the moving seat can be adjusted back and forth in the horizontal direction. The axis of the hinged end between the rotating frame and the moving seat faces both sides, so that the rotating frame and the headrest thereon can be adjusted in angle. Thus, through the setting of multiple degrees of freedom, the headrest can be conveniently adjusted to different states, meeting the usage needs of different people and greatly improving the use comfort of the chair. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the headrest adjustment structure of the chair.

[0015] Figure 2 is a schematic structural diagram of the lifter and its installation structure.

[0016] Figure 3 is a schematic connection diagram of the moving seat with the lifting adjustment rod and the rotating frame.

[0017] Figure 4 is a schematic structural diagram of the moving seat.

[0018] Figure 5 is a schematic sectional structural diagram of the moving seat.

[0019] Figure 6 is a schematic structural diagram of the adjustment mechanism.

[0020] Figure 7 、 8 are respectively schematic structural diagrams of the rotating frame of the other two implementation manners of the headrest adjustment structure of the chair.

[0021] Figure 9 is a schematic structural diagram of the connecting shaft. DETAILED DESCRIPTION OF THE INVENTION

[0022] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0023] It should be noted that if there are directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...) involved in the embodiments of the present utility model, then the directional indications are only used to explain the relative position relationship, movement conditions, etc. between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0024] If there are descriptions such as "first" or "second" involved in the embodiments of the present utility model, then the descriptions of "first" or "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0025] The present utility model provides a chair headrest adjustment structure.

[0026] The chair headrest adjustment structure of this embodiment includes a movable seat 2 that can move back and forth, and an adjustment mechanism 4 that drives the movable seat to move back and forth. The front end of the movable seat is hinged with a rotatable rotating frame 3, and a headrest 5 for supporting the head is installed on the rotating frame; in addition, a lifter 1 that can be lifted and lowered is installed on the backrest of the chair, and the movable seat 2 is installed on the lifter.

[0027] As Figures 1-6 shown, a lifter, a movable seat, and a rotating frame are sequentially installed between the backrest of the chair and the headrest. The lifter among them can be adjusted for lifting and lowering along the vertical direction, the movable seat can be adjusted for back-and-forth movement along the horizontal direction, and the axis of the hinged end between the rotating frame and the movable seat faces both sides, so that the rotating frame and the headrest thereon can be adjusted for angle.

[0028] For the described chair headrest adjustment structure, the headrest can be adjusted for lifting and lowering through the lifter. The lifter can be a through groove provided on the backrest and a rod that can move along the through groove, and at the same time, it is locked by screwing a screw rod on the backrest against the middle of the rod; the lifter 1 can also be asFigure 2 As shown in the figure, it includes a fixing seat 11 detachably installed on the backrest. A lifting groove 12 is vertically opened on the fixing seat. There is also a lifting adjustment rod 13 moving along the lifting groove. A wavy lifting adjustment groove 14 is vertically provided on the lifting adjustment rod. A positioner 15 is installed at the position opposite to the lifting adjustment groove on the fixing seat, and the end of the positioner is spherical, so that the lifting adjustment rod can be lifted smoothly until it is locked by the positioner after being lifted to the required position, thus realizing the lifting adjustment of the headrest. The positioner 15 can be of a fixed structure, or a positioning hole can be provided on the fixing seat 11, or a positioning base with a positioning hole can be provided. A spherical positioning bead or a positioning post with a spherical end is arranged in the positioning hole and a spring is arranged between the spherical positioning bead or the positioning post and the bottom of the positioning hole, and the function of the spring is used to further improve the smoothness of adjustment and the positioning strength.

[0029] For the headrest adjustment structure of the chair, the headrest can be adjusted back and forth through a moving seat. The moving seat can adopt a structure similar to that of a lifter, or a screw-nut pair or other devices, or as Figures 3-5 shown, the moving seat 2 includes a slider 22 installed on the lifter 1, that is, installed on the lifting adjustment rod 13, and a moving sleeve 21 sleeved outside the slider and movable in the front-back direction. The rotating frame 3 is connected to the moving sleeve; the adjustment mechanism includes a rack 23 arranged on the moving sleeve in the front-back direction. A block 41 is arranged on the slider and can be engaged with the rack. A spring 42 is installed between the block and the slider. The end of the block is clamped into the rack through the spring to achieve fixation. Its structure is simple and the adjustment operation is convenient. In addition, since people lean back with a greater force when sitting on the chair, in order to prevent the headrest from moving accidentally, the teeth of the rack 23 can be set as inclined teeth that are inclined towards the front side and perpendicular to the back side. While ensuring the adjustability through the inclined teeth, the slider can be tightened to prevent the headrest from sliding backward. The block 41 is connected with a lever 43 that drives it to disengage from the rack, so that the headrest can be adjusted again. The lever can be fixedly connected to the block, for example, connected to the bottom of the block, and the block is driven to disengage from the rack by pulling downward; or as Figures 3-6 shown, the lever 43 is rotatably installed on the moving sleeve 21, on one side of the block 41. A groove 44 is opened on the block. A block 45 extending into the groove is provided on the lever. When the lever rotates, the block drives the block to withdraw from the rack, and its operation is more convenient. Also, as Figure 2As shown in the figure, the top of the lifting adjustment rod 13 is provided with a horizontally arranged angle adjustment rod 16. The moving sleeve 21 is clamped on the angle adjustment rod through a detachable clamping sleeve 24. The angle adjustment rod is provided with a wavy rotation adjustment groove along the circumferential direction. A locator 15 that abuts against the rotation adjustment groove is installed on the moving sleeve or the clamping sleeve. This locator has the same function as the locator on the lifter, and can realize the rotation and positioning of the moving seat. In addition, the moving sleeve 21 includes an upper cover 25 and a lower cover 26 that are opposite to each other up and down and can be detachably connected. The rack 23 is arranged at the bottom inside the upper cover. A sliding groove is opened on the lower cover, and the slider 22 is slidably installed on the sliding groove. This is not only convenient for disassembly and assembly, but also can improve the aesthetics.

[0030] For the headrest adjustment structure of the chair described above, the headrest can also be adjusted in angle through a rotating frame. The ends of the rotating frame and the moving seat can be sleeved with each other and fixed by a screw, or as Figure 3 shown in the figure, an adjustment hole is opened horizontally on the moving seat 2. The middle part of the rotating frame 3 passes through the adjustment hole and is provided with a wavy pitch adjustment groove 31 along the circumferential direction. For example, the middle part of the rotating frame 3 is clamped between the upper cover 25 and the lower cover 26 of the moving seat, so as to form a second degree of freedom for angle adjustment, further increasing the adjustment range, enabling the headrest to form more adjustment states, and a locator 15 that abuts against the pitch adjustment groove is installed on the moving seat 2. This locator can also have the same function as the locators on the lifter and the moving seat, so as to position the rotating frame. Furthermore, the headrest 5 can also be hinged to the rotating frame 3, so as to form a further adjustment.

[0031] For the headrest adjustment structure of the chair described above, as Figure 1 、 3 shown in the figure, the rotating frame can be a fixed rod; it can also be as Figure 7 or Figure 8 shown in the figure, the rotating frame 3 includes a main rod 32 connected to the moving seat 2. The pitch adjustment groove 31 is arranged in the middle of the main rod. A number of sub-rods 33 are sequentially connected to both ends of the main rod, for example, one, two or more sub-rods. Both sides of the headrest 5 are hinged to the two end sub-rods. The main rod and the sub-rods, and adjacent sub-rods are sequentially connected head to tail through a connecting shaft 6, that is, the head of one sub-rod is connected to the tail of another sub-rod, and one, two or more connecting shafts 6 cooperate with each other, thereby increasing the degree of freedom of adjustment. The connection method can be hinged, clamped or sleeved. As Figure 7 shown in the figure, one sub-rod is connected to both sides of the main rod; as Figure 8 shown in the figure, two sub-rods are connected to both sides of the main rod; similarly, three or more sub-rods whose ends are sequentially connected by a connecting shaft can also be connected to both sides of the main rod. As Figure 9As shown, an elastic mechanism 7 or a ratchet mechanism 8 is provided on the connecting shaft 6 to increase the frictional force between the rods connected to each other, thereby achieving more stable adjustment and positioning; the elastic mechanism 7 can be an elastic washer or a spring, and the connecting shaft 6 can be a screw or a bolt. The ratchet mechanism 8 is a plurality of teeth arranged circumferentially at the end face of the screw head. A limiting mechanism can also be provided at the end of the main rod or at the ends of multiple auxiliary rods, and a limiting mechanism can also be provided on the surface of the ratchet mechanism 8.

[0032] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A chair headrest adjustment structure, characterized in that: It includes a movable seat (2) that can move back and forth, and an adjustment mechanism (4) that drives the movable seat to move back and forth. A rotatable rotary frame (3) is hinged to the front end of the movable seat, and a headrest (5) for supporting the head is installed on the rotary frame; the movable seat (2) includes a slider (22) and a movable sleeve (21) that can move back and forth outside the slider, and the rotary frame (3) is connected to the movable sleeve; the adjustment mechanism includes a rack (23) arranged in the movable sleeve in the front-back direction, a latch (41) that is arranged on the slider and can be engaged with the rack, and a spring (42) is installed between the latch and the slider.

2. The chair headrest adjustment structure according to claim 1, characterized in that: There is a lifter (1) that can be installed on the backrest of the chair in a liftable manner, and the movable seat (2) is installed on the lifter; the lifter (1) includes a fixed seat (11) that can be detachably installed on the backrest, a lift groove (12) is vertically opened on the fixed seat, and there is also a lift adjustment rod (13) that moves along the lift groove. A wavy lift adjustment groove (14) is vertically provided on the lift adjustment rod, and a locator (15) is installed on the fixed seat opposite to the lift adjustment groove.

3. The chair headrest adjustment structure according to claim 1, characterized in that: The movable sleeve (21) includes an upper cover (25) and a lower cover (26) that are opposite to each other up and down and can be detachably connected. The rack (23) is arranged at the bottom of the inner side of the upper cover, and a chute is opened on the lower cover. The slider (22) is relatively slidably installed on the chute.

4. The chair headrest adjustment structure according to claim 1 or 3, characterized in that: The teeth of the rack (23) are inclined teeth that are inclined towards the front side and perpendicular to the back side, and the latch (41) is connected with a lever (43) that drives it to disengage from the rack.

5. The chair headrest adjustment structure according to claim 4, characterized in that: The lever (43) is rotatably installed on the movable sleeve (21) on one side of the latch (41). A dial groove (44) with a groove is opened on the latch, and a dial block (45) extending into the dial groove is provided on the lever.

6. The chair headrest adjustment structure according to claim 2, wherein: The top of the lift adjustment rod (13) is provided with an angular adjustment rod (16) arranged horizontally. The movable sleeve (21) is clamped on the angular adjustment rod through a detachable clamp sleeve (24). The angular adjustment rod is provided with a wavy rotation adjustment groove along the circumferential direction, and a locator (15) is installed on the movable sleeve or the clamp sleeve against the rotation adjustment groove.

7. The chair headrest adjustment structure according to claim 1, characterized in that: An adjustment hole is horizontally opened on the movable seat (2). The middle part of the rotary frame (3) passes through the adjustment hole and is provided with a wavy pitch adjustment groove (31) along the circumferential direction. A locator (15) is installed on the movable seat (2) against the pitch adjustment groove.

8. The chair headrest adjustment structure according to claim 7, characterized in that: The rotary frame (3) includes a main rod (32), and several sub-rods (33) are sequentially connected to both ends of the main rod, and the sub-rod at the end is connected to the headrest (5).

9. The chair headrest adjustment structure according to claim 8, wherein: The main rod and the sub-rods, and adjacent sub-rods are sequentially connected end to end through a connecting shaft (6), and an elastic mechanism (7) or a tooth engaging mechanism (8) is provided on the connecting shaft (6).

10. The chair headrest adjustment structure according to claim 9, characterized in that: The elastic mechanism (7) is an elastic washer.

11. The chair headrest adjustment structure according to claim 9, characterized in that: The connecting shaft (6) is a screw, and the tooth engaging mechanism (8) is a plurality of teeth arranged along the circumferential direction at the end face of the screw head.

12. The chair headrest adjustment structure according to any one of claims 7-11, characterized in that: The headrest (5) is hinged to the rotary frame (3).

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