Headrest reciprocating adjusting mechanism

Abstract

The headrest reciprocating adjusting mechanism comprises a headrest assembly and a supporting assembly, the headrest assembly is slidably connected to the supporting assembly, and a gear adjusting assembly is arranged between the headrest assembly and the supporting assembly; the gear adjusting assembly comprises a gear piece, a supporting piece and an adjusting piece, a gear groove is formed in the gear piece in a sunken mode, and a plurality of tooth grooves are formed in the side wall of the gear groove in a sunken mode; the adjusting piece is movably connected to the supporting piece, the side, close to the tooth groove, of the adjusting piece protrudes to form clamping teeth, and the side, away from the tooth groove, of the adjusting piece is further provided with an elastic part. A limiting groove is formed in the supporting piece in a hollowed-out mode, an elastic limiting part is arranged in the middle of the limiting groove, the front end of the elastic limiting part protrudes and extends to form a limiting clamping hook, and the limiting groove is divided into an adjusting part and a reset part through the limiting clamping hook. A clamping head is formed on the side, close to the supporting piece, of the adjusting piece and slides left and right along the limiting groove. A guide head is formed on the side, close to the gear piece, of the adjusting piece, the guide head is clamped into the gear groove, a conversion part is formed on the rear side groove wall of the gear groove, and the conversion part is obliquely arranged backwards.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of sitting furniture, in particular to a headrest reciprocating adjusting mechanism. BACKGROUND

[0002] The headrest is a common component on the seat, which is used for supporting the back of the head and the back of the neck of the user, not only makes the sitting experience more comfortable, but also effectively relieves fatigue and protects the health of the cervical vertebra. And for the users of different body shapes or different sitting postures, the horizontal distance between the head and the backrest usually has more or less difference. Therefore, in order to improve the practicability of the seat, the headrest of the existing part of the seat can be adjusted forward and backward, and the user can adjust the position of the headrest according to the actual situation to ensure that the head and neck can be supported by the headrest, and the use experience is better.

[0003] But the existing seat headrest adjusting mechanism on the market usually sets a locking mechanism controlled by an adjusting button or a trigger between the headrest connecting seat and the backrest connecting seat, which needs to be pressed by one hand and adjusted forward and backward by the other hand, and cannot be adjusted by one hand. And the user needs to get up from the seat to adjust when operating, which is very cumbersome.

[0004] Therefore, how to make the headrest slide forward and backward relative to the backrest while the adjusting operation is simple and convenient has become the main problem to be solved at present. SUMMARY

[0005] In view of the above defects or deficiencies in the prior art, it is expected to provide a headrest reciprocating adjusting mechanism, which sets an adjusting piece and a gear slot that can be adjusted in a cycle gear between the gear piece and the supporting piece. The user only needs to push and pull the headrest assembly to automatically complete the gear adjusting operation during use, which is very simple. And by setting an elastic limiting part that can be elastically deformed in the middle of the limiting slot, the limiting catch on the elastic limiting part divides the limiting slot into an adjusting part and a reset part, and the stopper catch of the limiting catch is used to avoid the deflection of the adjusting piece during the adjusting process, so that the gear adjusting operation of the headrest is more stable and smooth. And only by extruding the elastic limiting part to make it elastically deform can drive the catch to move between the adjusting part and the reset part, so that the state switching operation is also more convenient.

[0006] The effect of the utility model is realized as follows:

[0007] The application provides a headrest reciprocating adjusting mechanism, which comprises a headrest assembly and a supporting assembly, the supporting assembly is configured to connect the seat body, the headrest assembly is slidably connected to the supporting assembly along the front and rear directions, and a gear adjusting assembly is arranged between the two.

[0008] The gear adjusting assembly comprises a gear, a support and an adjusting member, the gear is connected to the headrest assembly, and the support is connected to the support assembly; the gear is recessed with a front-to-back extending gear slot, and a plurality of tooth grooves are recessed on the side wall of the gear slot along the length direction; the adjusting member is movably connected to the support, and a clamping tooth is protruded on the side of the adjusting member close to the tooth groove; a resilient portion is further arranged on the side of the adjusting member away from the tooth groove, and the resilient portion acts on the adjusting member, so that the adjusting member always has a tendency to move towards the tooth groove;

[0009] The support is hollowed in the left-to-right direction and is provided with a limiting slot, and a resilient limiting portion extending in the horizontal direction is arranged in the middle of the limiting slot, the front end of the resilient limiting portion is protruded to form a limiting clamping hook, the limiting clamping hook divides the limiting slot into two parts, the side close to the tooth groove forms an adjusting portion, and the side away from the tooth groove forms a reset portion; a clamping head is protruded on the side of the adjusting member close to the support, and the clamping head is clamped into the limiting slot and can slide left and right along the limiting slot;

[0010] A guide head is protruded on the side of the adjusting member close to the gear, the guide head is clamped into the gear slot, and the rear side wall of the gear slot forms a conversion portion, and the conversion portion is inclinedly arranged towards the rear;

[0011] The headrest reciprocating adjusting mechanism has switchable adjusting and reset states, when the headrest assembly slides forward, the gear slides forward relative to the support, the clamping head is located in the adjusting portion, the clamping tooth is sequentially clamped and matched with the plurality of tooth grooves under the elastic force of the resilient portion to realize gear adjustment; when the headrest assembly slides forward to the maximum distance, the guide head slides downwards along the inclined surface of the conversion portion, at the same time, the guide head moves in the horizontal direction away from the tooth groove, and then drives the clamping head to press the resilient limiting portion to make it elastically deform until the clamping head slides from the adjusting portion into the reset portion, and the headrest reciprocating adjusting mechanism is switched to the reset state; in the reset state, the clamping head abuts against the limiting clamping hook, so that the clamping tooth avoids the tooth groove, the gear can slide backward relative to the support, and the headrest assembly can slide backward to reset; a pushing member is arranged on the front side of the gear or the headrest assembly, when the support slides to the front end, the pushing member pushes the resilient limiting portion to make it elastically deform, so that the limiting clamping hook avoids the clamping head, the clamping head slides from the reset portion into the adjusting portion under the elastic force of the resilient portion, and the headrest reciprocating adjusting mechanism is switched to the adjusting state again.

[0012] Further, the front side wall of the tooth groove is horizontally arranged, and the rear side wall of the tooth groove is inclinedly arranged, so that in the adjusting state, the clamping tooth firmly abuts against the horizontal side wall of the front side of the tooth groove, so that the headrest assembly can stably support the head of the user; in the adjusting state, the clamping tooth smoothly slides into the next tooth groove along the inclined surface of the tooth groove, so that the adjusting operation of the headrest reciprocating adjusting mechanism is more stable and smooth.

[0013] Further, the adjusting piece further comprises a swing part and a rotating part, the clamping tooth, the clamping head and the guide head are arranged on the swing part, and the rotating part is rotationally connected to the supporting piece. The swing part rotates around the rotating part and drives the clamping tooth, the clamping head and the guide head to move left and right, so that the movement process of the adjusting piece is more stable and the stability is better.

[0014] Further, the elastic part, the swing part and the rotating part are integrally formed, the elastic part is a curved spring structure, and the elastic part extends from the rotating part to form a direction away from the tooth groove. Not only has a large reset elastic force when deformed, but also the elastic part, the swing part and the rotating part are integrally formed, the overall stability of the adjusting piece is better, and the structure is simple and convenient to install.

[0015] Further, the elastic part and the swing part are a split structure, the elastic part is a spring, one end of the elastic part acts on the supporting piece and the other end acts on the swing part, so that the swing part always has a tendency to rotate towards the tooth groove. By setting the elastic part as a spring, the elastic part has sufficient elastic force, and no additional processing is required, which is low in cost.

[0016] Further, the bottom end of the supporting piece is upwardly recessed to form a mounting groove, and the adjusting piece is arranged in the mounting groove. Not only improves the connection strength of the adjusting piece and the supporting piece, but also makes the two into one whole, which is more compact in structure and convenient to install.

[0017] Further, the gear piece is recessed to form a first connecting groove, and the supporting piece is slidingly connected to the gear piece through the first connecting groove. Not only improves the connection strength of the gear piece and the supporting piece, but also makes the gear adjusting mechanism as a whole arranged inside the gear piece, which is more compact in structure.

[0018] Further, the gear piece is hollow along the length direction to form a second connecting groove, the supporting piece is connected to the supporting assembly by a screw connection, and the screw passes through the supporting piece and the second connecting groove and is fixed to the supporting assembly. Not only is it convenient to install and disassemble, but also the gear piece is clamped between the supporting piece and the supporting assembly, which has high connection strength and further improves the stability of the headrest adjusting operation.

[0019] Further, the headrest assembly comprises a headrest body and a headrest connecting piece extending along the front and rear directions, the headrest body is rotationally connected to the front end of the headrest connecting piece, and the gear piece is connected to the lower end of the headrest connecting piece. The inclination angle is adjusted by the rotation of the headrest body, which improves the adjusting freedom of the headrest body and ensures that the headrest body can fit the user's head, which is more practical.

[0020] Further, the support assembly comprises a sliding support and a rotating support, the rotating support is configured to connect the seat back, and the sliding support is rotatably connected to the rotating support; the upper end of the sliding support is recessed to be provided with a sliding groove extending along the front-rear direction, and the gear is slidably connected to the sliding support through the sliding groove. The headrest body can further adjust the inclination angle through the rotation of the sliding support, and the degree of freedom is higher. Moreover, the gear remains relatively fixed with the sliding support in the left-right direction, and the connection strength is higher, further improving the stability of the headrest adjustment operation.

[0021] The headrest reciprocating adjustment mechanism provided by the application only needs to pull the headrest assembly forward when adjusting the front-rear position of the headrest, the clamping teeth are sequentially clamped and matched with the tooth grooves under the elastic force of the elastic part, and when adjusted to the appropriate position, only needs to release the headrest assembly, the clamping teeth can be stably clamped into the tooth groove under the elastic force of the elastic part, and the headrest assembly can be stably fixed at the current position when it is subjected to the backward relying force; when resetting the headrest, only needs to pull the headrest assembly forward again to the most front end, the guide head moves along the inclined surface of the conversion part, and then drives the clamping head to slide into the reset part, so that the clamping teeth avoid the tooth groove, the headrest reciprocating adjustment mechanism can automatically switch to the reset state, and the user can smoothly push the headrest assembly backward to the last end until the abutting piece abuts against the elastic limiting part, so that the clamping head is separated from the elastic clamping hook and slides into the adjustment part again, the clamping teeth are clamped into the tooth groove again, and the headrest reciprocating adjustment mechanism automatically switches to the adjustment state. Therefore, the user only needs to push and pull the headrest assembly during use to automatically complete the gear adjustment operation, which is very simple.

[0022] Moreover, by hollowing out the limiting groove on the support along the left-right direction, and setting the elastically deformable elastic limiting part in the middle of the groove, the limiting clamping hook on the elastic limiting part separates the limiting groove into the adjustment part and the reset part, with the help of the stop of the limiting clamping hook, the clamping head can be stably clamped into the adjustment part in the adjustment state, and the clamping head can be stably clamped into the reset part in the reset state, avoiding the deflection of the adjustment part during adjustment, so that the gear adjustment operation of the headrest is more stable and smooth; and only needs to squeeze the elastic limiting part to make it elastically deform to drive the clamping head to move between the adjustment part and the reset part, so that the state switching operation is also relatively convenient. BRIEF DESCRIPTION OF DRAWINGS

[0023] Other features, objects, and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the drawings:

[0024] Figure 1 The headrest reciprocating adjustment mechanism provided by the application provides a three-dimensional structure schematic diagram;

[0025] Figure 2 The headrest reciprocating adjustment mechanism provided by the application provides a change process schematic diagram;

[0026] Figure 3 An internal structure diagram of a headrest reciprocating adjustment mechanism provided by an embodiment of the present application is shown in the figure;

[0027] Figure 4 An internal structure diagram of a gear adjustment assembly provided by an embodiment of the present application is shown in the figure;

[0028] Figure 5 A connection structure diagram between a support and a headrest connecting piece provided by an embodiment of the present application is shown in the figure;

[0029] Figure 6 A change diagram of the gear adjustment assembly when the headrest assembly is located at the last end provided by an embodiment of the present application is shown in the figure;

[0030] Figure 7 A change diagram of the gear adjustment assembly in an adjustment state provided by an embodiment of the present application is shown in the figure;

[0031] Figure 8 A change diagram of the gear adjustment assembly when switching from an adjustment state to a reset state provided by an embodiment of the present application is shown in the figure;

[0032] Figure 9 A connection structure diagram of a headrest body and a headrest connecting piece provided by an embodiment of the present application is shown in the figure;

[0033] Figure 10 A connection structure diagram between a sliding support and a rotating support provided by an embodiment of the present application is shown in the figure;

[0034] Figure 11 A change process diagram of an adjustment piece when the elastic part is a spring provided by an embodiment of the present application is shown in the figure;

[0035] The reference signs are as follows: 1-gear piece, 101-first connecting groove, 102-second connecting groove, 110-gear groove, 111-tooth groove, 112-conversion part, 120-guiding part, 2-support, 201-mounting groove, 202-abutment part, 203-guiding groove, 204-avoidance groove, 210-limiting groove, 210a-adjustment part, 210b-reset part, 211-elastic limiting part, 212-limiting clasp, 220-rotating support hole, 3-adjustment piece, 3a-elastic part, 3b-swinging part, 3c-rotating part, 310-claw, 320-claw head, 330-guiding head, 340-rotating support column, 4-headrest connecting piece, 410-pushing piece, 5-headrest body, 6-sliding support, 601-sliding groove, 7-rotating support. DETAILED DESCRIPTION

[0036] The application will be described in further detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related utility model, and not to limit the utility model. In addition, it should be noted that, for the convenience of description, only parts related to the utility model are shown in the drawings.

[0037] Please refer to the drawings Figures 1-11 The embodiment of the application provides a headrest reciprocating adjusting mechanism, comprising a headrest assembly and a support assembly, the support assembly is configured to be connected to a chair body, the headrest assembly is slidingly connected to the support assembly along the front-back direction, and a gear adjusting assembly is arranged between the headrest assembly and the support assembly.

[0038] The gear adjusting assembly comprises a gear piece 1, a support piece 2 and an adjusting piece 3, the gear piece 1 is connected to the headrest assembly, and the support piece 2 is connected to the support assembly; the gear piece 1 is recessed with a gear slot 110 extending in the front-back direction, and a plurality of tooth grooves 111 are recessed on the side wall of the gear slot 110 in the length direction; the adjusting piece 3 is movably connected to the support piece 2, and a clamping tooth 310 is protruded on the side of the adjusting piece 3 close to the tooth groove 111; the side of the adjusting piece 3 away from the tooth groove 111 is further provided with an elastic part 3a, the elastic part 3a acts on the adjusting piece 3, so that the adjusting piece 3 always has a tendency to move towards the tooth groove 111;

[0039] The support piece 2 is hollowed out with a limiting slot 210 in the left-right direction, the middle part of the limiting slot 210 is provided with an elastic limiting part 211 extending in the horizontal direction, the front end of the elastic limiting part 211 is protruded to form a limiting clasp 212, the limiting clasp 212 divides the limiting slot 210 into two parts in the left-right direction, the side close to the tooth groove 111 forms an adjusting part 210a, and the side away from the tooth groove 111 forms a reset part 210b; the side of the adjusting piece 3 close to the support piece 2 is protruded to form a clamping head 320, the clamping head 320 is clamped into the limiting slot 210 and can slide in the limiting slot 210 in the left-right direction;

[0040] The side of the adjusting piece 3 close to the gear piece 1 is protruded to form a guide head 330, the guide head 330 is clamped into the gear slot 110, the rear side wall of the gear slot 110 forms a conversion part 112, and the conversion part 112 is inclinedly arranged towards the rear;

[0041] The headrest reciprocating adjusting mechanism has switchable adjusting state and reset state, when the headrest assembly slides forward, the gear 1 slides forward relative to the support 2, the clamping head 320 is located in the adjusting part 210a, the clamping teeth 310 are sequentially clamped and matched with the tooth grooves 111 under the elastic force of the elastic part 3a to realize gear adjusting; when the headrest assembly slides to the maximum distance, the guide head 330 slides downward along the slope of the conversion part 112, at the same time, the guide head 330 moves in the horizontal direction away from the tooth grooves 111, and further drives the clamping head 320 to extrude the elastic limiting part 211 to make it elastically deform until the clamping head 320 slides from the adjusting part 210a into the reset part 210b, the headrest reciprocating adjusting mechanism switches to the reset state; in the reset state, the clamping head 320 abuts against the limiting clamping hook 212, so that the clamping teeth 310 avoid the tooth grooves 111, the gear 1 can slide backward relative to the support 2, and the headrest assembly can slide backward to reset; the front side of the gear 1 or the headrest assembly is provided with the pushing piece 410, when the support 2 slides to the most front end, the pushing piece 410 pushes the elastic limiting part 211 to make it elastically deform, so that the limiting clamping hook 212 avoids the clamping head 320, the clamping head 320 slides from the reset part 210b into the adjusting part 210a under the elastic force of the elastic part 3a, and the headrest reciprocating adjusting mechanism switches to the adjusting state again.

[0042] In the embodiment, please refer to the accompanying drawings Figures 6-8 When the front and back positions of the headrest need to be adjusted, the headrest assembly only needs to be pulled forward, the clamping teeth 310 are sequentially clamped and matched with the tooth grooves 111 under the elastic force of the elastic part 3a, when the headrest assembly is adjusted to the appropriate position, the clamping teeth 310 can be stably clamped into the tooth grooves 111 under the elastic force of the elastic part 3a, and the headrest assembly can be stably fixed at the current position when it is subjected to the backward relying force; when the headrest needs to be reset, the headrest assembly only needs to be pulled forward to the most front end again, the guide head 330 moves along the slope of the conversion part 112, and further drives the clamping head 320 to slide from the adjusting part 210a into the reset part 210b, so that the clamping teeth 310 avoid the tooth grooves 111, the headrest reciprocating adjusting mechanism can automatically switch to the reset state, and the user can smoothly push the headrest assembly to the last end until the pushing piece 410 pushes the elastic limiting part 211, so that the clamping head 320 is separated from the elastic clamping hook 212 and re-slides into the adjusting part 210a, the clamping teeth 310 re-clamp into the tooth grooves 111, and the headrest reciprocating adjusting mechanism automatically switches to the adjusting state. Therefore, the user only needs to push and pull the headrest assembly to automatically complete the gear adjusting operation in the use process, which is very simple.

[0043] Furthermore, by hollowing the limiting groove 210 on the support 2 in left and right directions, and arranging the elastic limiting part 211 which can be elastically deformed in the middle of the groove 210, the limiting clasp 212 on the elastic limiting part 211 divides the limiting groove 210 into the adjusting part 210a and the resetting part 210b, and by means of the stop of the limiting clasp 212, the clamping head 320 can be stably clamped into the adjusting part 210a in the adjusting state, and the clamping head 320 can be stably clamped into the resetting part 210b in the resetting state, so that the deflection of the adjusting part 3 during the adjusting process is avoided, and the gear adjusting operation of the headrest is more stable and smooth; and the clamping head 320 can be moved between the adjusting part 210a and the resetting part 210b by only extruding the elastic limiting part 211 to make it elastically deform, so that the state switching operation is also more convenient.

[0044] Preferably, the side of the limiting clasp 212 facing the adjusting part 210a is arranged to be inclined, so that when the clamping head 320 is extruded along the horizontal direction to press the limiting clasp 212 when the headrest reciprocating adjusting mechanism is switched from the adjusting state to the resetting state, the clamping head 320 can slide along the inclined surface of the limiting clasp 212, so as to be smoothly slid from the adjusting part 210a into the resetting part 210b, and the smoothness of the gear adjusting operation is further improved.

[0045] Preferably, seven tooth grooves 111 are arranged on the gear groove 110, that is, the headrest reciprocating adjusting mechanism has seven gears which can be adjusted, and the degree of freedom is higher. Of course, in other embodiments of the present application, the number of tooth grooves 111 on the gear groove 110 can also be five, six, eight, etc.

[0046] Please refer to the accompanying drawings Figure 4 In some embodiments of the present application, the front side groove wall of the tooth groove 111 is horizontally arranged, and the rear side groove wall of the tooth groove 111 is arranged to be inclined.

[0047] In the present embodiment, by arranging the front side groove wall of the tooth groove 111 to be horizontal, when the user leans against the headrest in the adjusting state, the headrest assembly is subjected to a backward relying force, and the gear part 1 has a tendency to slide backward relative to the support 2, and because the clamping tooth 310 firmly abuts against the horizontal groove wall of the front side of the tooth groove 111, the gear part 1 can be kept relatively fixed with the support 2, so that the headrest assembly can stably support the head of the user; furthermore, by arranging the rear side groove wall of the tooth groove 111 to be inclined, when the user pulls the headrest assembly forward in the adjusting state, the gear part 1 has a tendency to slide forward relative to the support 2, and because the clamping tooth 310 pushes the inclined groove wall of the rear side of the tooth groove 111 and smoothly slides into the next tooth groove 111 along the inclined surface of the tooth groove 111, the gear switching is realized, so that the adjusting operation of the headrest reciprocating adjusting mechanism is more stable and smooth.

[0048] Please refer to the accompanying drawings Figure 4In some embodiments of the present application, the adjusting member 3 further comprises a swinging portion 3b and a rotating portion 3c, the clamping teeth 310, the clamping head 320 and the guide head 330 are arranged on the swinging portion 3b, and the rotating portion 3c is rotatably connected to the supporting member 2.

[0049] In the present embodiment, by rotatably connecting the adjusting member 3 to the supporting member 2, the swinging portion 3b rotates around the rotating portion 3c and drives the clamping teeth 310, the clamping head 320 and the guide head 330 to move left and right, so that the movement of the adjusting member 3 is more stable and has better stability.

[0050] The rotating portion 3c has a columnar rotating support column 340 protruding from the side close to the supporting member 2, the supporting member 2 is hollowly provided with a rotating support hole 220 matched with the rotating support column 340, the rotating support column 340 is clamped to the supporting member 2 through the rotating support hole 220 and can rotate circumferentially in the rotating support hole 220, thereby driving the swinging portion 3b on the front side to swing left and right.

[0051] Please refer to the accompanying drawings Figure 4 In some embodiments of the present application, the elastic portion 3a, the swinging portion 3b and the rotating portion 3c are integrally formed, the elastic portion 3a is a curved spring structure, and the elastic portion 3a is formed by extending from the rotating portion 3c away from the tooth groove 111.

[0052] In the present embodiment, by setting the elastic portion 3a as a spring structure, not only has a greater reset spring force when deformed, but also the elastic portion 3a, the swinging portion 3b and the rotating portion 3c are integrally formed, the swinging portion 3b and the elastic portion 3a can rotate synchronously relative to the rotating portion 3c, so that the overall stability of the adjusting member 3 is better, and the structure is simple and convenient to install. When the headrest reciprocating adjusting mechanism is switched from the adjusting state to the reset state, the swinging portion 3b rotates towards the elastic portion 3a, the elastic portion 3a is extruded and deformed to generate a reset spring force, so that when it is switched to the adjusting state again, the swinging portion 3b automatically rotates towards the tooth groove 111 under the action of the elastic force of the elastic portion 3a.

[0053] Please refer to the accompanying drawings Figure 11 In some embodiments of the present application, the elastic portion 3a can also have other structures, for example: the elastic portion 3a and the swinging portion 3b are a split structure, the elastic portion 3a is a spring, one end of the elastic portion 3a acts on the supporting member 2 and the other end acts on the swinging portion 3b, so that the swinging portion 3b always has a tendency to rotate towards the tooth groove 111. By setting the elastic portion 3a as a spring, not only does the elastic portion 3a have sufficient spring force, but also it does not need to be additionally processed, which is low in cost.

[0054] Please refer to the accompanying drawings Figure 4 In some embodiments of the present application, the bottom end of the supporting member 2 is upwardly recessed to form a mounting groove 201, and the adjusting member 3 is arranged in the mounting groove 201.

[0055] In the embodiment, by arranging the adjusting member 3 in the mounting groove 201, not only the connecting strength of the adjusting member 3 and the supporting member 2 is improved, but also the two are connected as a whole, and the structure is more compact and convenient to install.

[0056] The mounting groove 201 is further provided with a longitudinal abutting portion 202, the elastic portion 3a is attached to the abutting portion 202, the abutting portion 202 is recessed on the side close to the elastic portion 3a, so that the elastic portion 3a is attached to the concave surface of the abutting portion 202 and is not easy to be separated from the abutting portion 202, and the stability is better.

[0057] Please refer to the accompanying drawings Figures 3-4 In some embodiments of the present application, the first connecting groove 101 is recessed on the gear member 1, and the supporting member 2 is connected to the gear member 1 through the first connecting groove 101. Not only the connecting strength of the gear member 1 and the supporting member 2 is improved, but also the whole gear adjusting mechanism is arranged in the gear member 1, and the structure is more compact.

[0058] The first connecting groove 101 is further provided with a guide portion 120 extending along the front and back directions, the bottom of the supporting member 2 is recessed with a guide groove 203, the supporting member 2 is attached to the guide portion 120 through the guide groove 203, and the supporting member 2 can slide along the length direction of the guide portion 120, and the stability is better. Furthermore, the sidewall of the guide portion 120 and the groove wall of the gear groove 110 are connected as a whole, and a plurality of tooth grooves 111 are recessed on the guide portion 120, and when the guide portion 120 is clamped into the guide groove 203, the tooth grooves 111 can face the clamping teeth 310 in the mounting groove 201.

[0059] Please refer to the accompanying drawings Figures 3-4 In some embodiments of the present application, the second connecting groove 102 is hollow along the length direction on the gear member 1, and the supporting member 2 is connected to the supporting assembly through the screw connection, and the screw passes through the supporting member 2 and the second connecting groove 102 and is fixed to the supporting assembly.

[0060] In the embodiment, the supporting member 2 and the supporting assembly are fixed through the screw connection, which is convenient to install and disassemble, and the screw passes through the second connecting groove 102, so that the gear member 1 is clamped between the supporting member 2 and the supporting assembly, the connecting strength is higher, and the stability of the headrest adjusting operation is further improved.

[0061] Preferably, the groove bottom of the first connecting groove 101 is hollow with two second connecting grooves 102 which are symmetrical left and right, and the connecting strength between the gear member 1 and the supporting member 2 is further improved, so that the sliding process of the gear member 1 relative to the supporting member 2 is more stable and smooth.

[0062] Please refer to the accompanying drawings Figure 9In some embodiments of the present application, the headrest assembly comprises a headrest body 5 and a headrest connecting piece 4 extending in the front-rear direction, the headrest body 5 is rotationally connected to the front end of the headrest connecting piece 4, and the gear piece 1 is connected to the lower end of the headrest connecting piece 4.

[0063] In the present embodiment, the curves of the back of the head and the back of the neck of different users or in different sitting postures are different, so that the headrest with a fixed inclination angle may not meet the needs of various users. Therefore, by rotationally connecting the headrest body 5 to the headrest connecting piece 4, the headrest body 5 can not only adjust the front-rear position by sliding the headrest connecting piece 4, but also adjust the inclination angle by rotating the headrest body 5, thereby improving the adjustment freedom of the headrest body 5, ensuring that the headrest body 5 can fit the user's head, and being more practical.

[0064] Preferably, the gear piece 1 is fixed to the bottom end of the headrest connecting piece 4 by screw connection, which is convenient to install and disassemble. The front side of the bottom end of the headrest connecting piece 4 is further provided with a pushing piece 410, and the top end of the supporting piece 2 is recessed to provide an avoiding groove 204 for avoiding the pushing piece 410, the avoiding groove 204 is communicated with the limiting groove 210, so that when the headrest assembly is reset to the last end, the pushing piece 410 passes through the avoiding groove 204 and pushes the elastic limiting part 211, so that the elastic limiting part 211 is deformed, and the clamping head 320 is separated from the reset part 210b.

[0065] Please refer to the accompanying drawings Figure 10 In some embodiments of the present application, the supporting assembly comprises a sliding supporting piece 6 and a rotating supporting piece 7, the rotating supporting piece 7 is configured to connect to the chair body, and the sliding supporting piece 6 is rotationally connected to the rotating supporting piece 7; the upper end of the sliding supporting piece 6 is recessed to provide a sliding groove 601 extending in the front-rear direction, and the gear piece 1 is slidingly connected to the sliding supporting piece 6 through the sliding groove 601.

[0066] In the present embodiment, by rotationally connecting the sliding supporting piece 6 to the rotating supporting piece 7, the headrest body 5 can further adjust the inclination angle by rotating the sliding supporting piece 6, and the adjustment freedom is higher. Moreover, the gear piece 1 is slidingly connected to the sliding supporting piece 6 through the sliding groove 601, so that the gear piece 1 is relatively fixed with the sliding supporting piece 6 in the left-right direction, the connection strength is higher, and the stability of the headrest adjustment operation is further improved.

[0067] It should be understood that the above-mentioned terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is more than three.

[0068] The above description is only the preferred embodiment of the present application and the explanation of the technical principles applied. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the technical solutions formed by mutually replacing the above-mentioned features and the technical features disclosed in the present application (but not limited to) with similar functions.

Claims

1. A headrest reciprocating adjustment mechanism characterized by, The application relates to a headrest assembly and a support assembly, the support assembly is configured to connect a chair body, the headrest assembly is slidably connected to the support assembly in the front-back direction, and a gear adjusting assembly is arranged between the headrest assembly and the support assembly; The gear adjusting assembly comprises a gear part (1), a support part (2) and an adjusting part (3), the gear part (1) is connected to the headrest assembly, and the support part (2) is connected to the support assembly; a gear groove (110) extending in the front-back direction is recessed on the gear part (1); a plurality of tooth grooves (111) are recessed on the side wall of the gear groove (110) in the length direction; the adjusting part (3) is movably connected to the support part (2), and a clamping tooth (310) is protruded on the side of the adjusting part (3) close to the tooth groove (111); an elastic part (3a) is further arranged on the side of the adjusting part (3) away from the tooth groove (111), the elastic part (3a) acts on the adjusting part (3), so that the adjusting part (3) always has a moving tendency towards the tooth groove (111); A limiting groove (210) is hollowed out on the support part (2) in the left-right direction, a horizontal elastic limiting part (211) is arranged in the middle of the limiting groove (210), a limiting clamping hook (212) is protruded at the front end of the elastic limiting part (211), the limiting clamping hook (212) divides the limiting groove (210) into two left and right parts, an adjusting part (210a) is formed on the side close to the tooth groove (111), and a reset part (210b) is formed on the side away from the tooth groove (111); a clamping head (320) is protruded on the side of the adjusting part (3) close to the support part (2), the clamping head (320) is clamped into the limiting groove (210) and can slide in the limiting groove (210) in the left-right direction; A guide head (330) is protruded on the side of the adjusting part (3) close to the gear part (1), the guide head (330) is clamped into the gear groove (110), a conversion part (112) is formed on the rear side groove wall of the gear groove (110), and the conversion part (112) is arranged in a backward inclination mode. The headrest reciprocating adjusting mechanism has switchable adjusting state and reset state, when the headrest assembly slides forward, the gear piece (1) slides forward relative to the support piece (2), the clamping head (320) is located in the adjusting part (210a), the clamping tooth (310) is sequentially clamped and matched with a plurality of tooth grooves (111) under the elastic force of the elastic part (3a) to realize gear adjusting; when the headrest assembly slides forward to the maximum distance, the guide head (330) slides downward along the inclined surface of the conversion part (112), at the same time, the guide head (330) moves in the horizontal direction away from the tooth groove (111), and further drives the clamping head (320) to press the elastic limiting part (211) to make it elastically deform until the clamping head (320) slides into the reset part (210b) from the adjusting part (210a), the headrest reciprocating adjusting mechanism switches to the reset state; in the reset state, the clamping head (320) abuts against the limiting clamping hook (212), so that the clamping tooth (310) avoids the tooth groove (111), the gear piece (1) can slide backward relative to the support piece (2), and the headrest assembly can slide backward to reset; a pushing piece (410) is arranged on the front side of the gear piece (1) or the headrest assembly, when the support piece (2) slides to the most front end, the pushing piece (410) pushes the elastic limiting part (211) to make it elastically deform, so that the limiting clamping hook (212) avoids the clamping head (320), the clamping head (320) slides into the adjusting part (210a) from the reset part (210b) under the elastic force of the elastic part (3a), and the headrest reciprocating adjusting mechanism switches to the adjusting state again.

2. The headrest reciprocating adjustment mechanism of claim 1, wherein, The front side groove wall of the tooth groove (111) is horizontally arranged, and the rear side groove wall of the tooth groove (111) is obliquely arranged.

3. The headrest reciprocating adjustment mechanism of claim 1, wherein, The adjusting piece (3) further comprises a swinging part (3b) and a rotating part (3c), the clamping tooth (310), the clamping head (320) and the guide head (330) are arranged on the swinging part (3b), and the rotating part (3c) is rotationally connected to the support piece (2).

4. The headrest reciprocating adjustment mechanism of claim 3, wherein, The elastic part (3a), the swinging part (3b) and the rotating part (3c) are integrally formed, the elastic part (3a) is a curved elastic sheet structure, and the elastic part (3a) is formed by extending from the rotating part (3c) away from the tooth groove (111).

5. The headrest reciprocating adjustment mechanism of claim 3, wherein, The elastic part (3a) and the swinging part (3b) are in a split structure, the elastic part (3a) is a spring, one end of the elastic part (3a) acts on the support piece (2) and the other end acts on the swinging part (3b), so that the swinging part (3b) always has a tendency to rotate towards the tooth groove (111).

6. The headrest reciprocating adjustment mechanism of claim 1, wherein, The bottom end of the support piece (2) is upwardly recessed to form a mounting groove (201), and the adjusting piece (3) is arranged in the mounting groove (201).

7. The headrest reciprocating adjustment mechanism of claim 1, wherein, The gear piece (1) is provided with a first connecting groove (101) in a recessed manner, and the supporting piece (2) is connected to the gear piece (1) in a sliding manner through the first connecting groove (101).

8. The headrest reciprocating adjustment mechanism of claim 1, wherein, The gear piece (1) is provided with a second connecting groove (102) in a length direction in a hollowed-out manner, and the supporting piece (2) is connected to the supporting assembly in a screwing manner, the screw passes through the supporting piece (2) and the second connecting groove (102) and is fixed to the supporting assembly.

9. The headrest reciprocating adjustment mechanism of claim 1, wherein, The headrest assembly comprises a headrest body (5) and a headrest connecting piece (4) extending in a front-rear direction, the headrest body (5) is rotationally connected to the front end of the headrest connecting piece (4), and the gear piece (1) is connected to the lower end of the headrest connecting piece (4).

10. The headrest reciprocating adjustment mechanism of claim 1, wherein, The supporting assembly comprises a sliding supporting piece (6) and a rotating supporting piece (7), the rotating supporting piece (7) is configured to connect a chair body, and the sliding supporting piece (6) is rotationally connected to the rotating supporting piece (7); the upper end of the sliding supporting piece (6) is provided with a sliding groove (601) extending in a front-rear direction in a recessed manner, and the gear piece (1) is connected to the sliding supporting piece (6) in a sliding manner through the sliding groove (601).

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