CN113662380B - Chair back adjusting assembly for chair and chair - Google Patents

Abstract

The invention discloses a chair back adjusting assembly for a chair and the chair, which comprise a first part and a second part which move relatively, wherein the first part is connected with a gear piece, the second part is connected with a gear piece, and the gear piece is in sliding fit with a chute through a sliding block; the gear piece is provided with clamping grooves distributed along the sliding direction, the gear piece comprises elastic clamping pins which are matched with the clamping grooves in a clamping manner, and when the gear piece and the gear piece slide relatively, the clamping pins switch positions among the clamping grooves; the gear engaging member further includes a state switching assembly configured to change a mating relationship of the bayonet and the bayonet slot; the state switching component is provided with a working position and a locking position which can be mutually switched, when the state switching component is positioned at the working position, the clamping pin is in a working state, and the clamping pin is subjected to elastic force towards the clamping groove; when the state switching component is positioned at the locking position, the clamping pin is in a locking state, and the clamping pin is subjected to reverse elastic force; compared with the prior art, the device realizes the adjustment of the cyclic reciprocation among the components, does not need a switch, and is convenient to operate.

Description

Chair back adjusting assembly for chair and chair

Technical Field

The invention relates to the field of furniture, in particular to a chair back adjusting assembly for a chair and the chair.

Background

In modern life, in order to meet different use demands of people, adjustable furniture is popular, and a seat is taken as an example: at present, the functions of the seat are more and more abundant, and most of the functions are realized by adjusting a certain part of the seat, and as most of the adjusting mechanisms on the seat adopt air bars or electric push rods and the like, the switch for controlling the adjustment is more and more, so that the beauty of the seat is seriously affected, and meanwhile, the operation of a user is complicated, so that the user experience is affected; sometimes misoperation can occur, the mood of a user is influenced, meanwhile, the switch is damaged, and even some switches are not operated by hands, and the user is required to bend down or lift up to operate; such seats look higher but make the simple matter more complex, not considering the interaction with the user in the actual use of the product, and not conforming to ergonomics; therefore, in order to simplify the operation, a mechanism for adjusting the components without a switch is required.

The invention patent of China of CN201820253966.X discloses a chair with waist leaning adjusting function, including back of the chair, seat support and footing, is equipped with the cavity on the back of the chair, the support body is installed through lifting in the upper portion in the cavity, lifting and folding device includes fixing base and linking arm, be equipped with the fixed arm on the fixing base, fixed arm and linking arm are articulated, and through rigid connection piece with at least two linking arms fixed synchronous motion, the fixing base is fixed with the back of the chair, rigid connection piece is fixed with the support body. According to the invention, the cavity is formed in the chair back, the supporting piece is arranged in the cavity, the lifting and folding device is hinged with the chair back, and the pawl and the ratchet wheel are used for positioning and supporting, so that the lumbar support adjustment of the chair back is realized. The back load is supported by the ratchet mechanism arranged in the back load supporting mechanism, the connection between the ratchet mechanism and the chair back component is weak, the supporting capacity is affected, and the back load supporting mechanism is difficult to assemble and is not suitable for modularized assembly production.

Disclosure of Invention

In order to solve the technical problems, the invention provides a chair back adjusting assembly for a chair, which comprises a first part and a second part which can move relatively, wherein the first part and the second part are controlled to move or lock through a sliding gear mechanism, and the sliding gear mechanism controls the state of a bayonet lock through the elasticity of a spring, so that the bayonet lock can be clamped and matched with a bayonet lock and can be switched between the bayonet lock and the bayonet lock can be separated from the bayonet lock to return to an initial position.

Still further, the invention provides a seat using the chair back adjusting assembly.

The technical scheme of the invention is realized as follows:

The chair back adjusting assembly comprises a first part and a second part which move relatively, the first part is connected with a gear piece, the second part is connected with a gear piece, and the gear piece are in sliding fit with a sliding groove through a sliding block so that the first part and the second part move relatively; the gear piece is provided with a plurality of clamping grooves distributed along the sliding direction, the gear piece comprises elastic clamping pins which are matched with the clamping grooves in a clamping manner, and when the gear piece and the gear piece slide relatively, the clamping pins switch positions among the clamping grooves; the gear engaging member further comprises a state switching component configured to change the mating relationship of the bayonet and the bayonet slot; the state switching component is provided with a working position and a locking position which can be mutually switched, when the state switching component is positioned at the working position, the clamping pin is in a working state, and the clamping pin is subjected to elastic force towards the clamping groove; when the state switching assembly is positioned at the locking position, the clamping pin is in a locking state, the clamping pin is subjected to reverse elastic force, and the first component and the second component are in a relatively fixed state.

According to the invention, the gear piece and the gear piece are respectively connected to two different parts, so that the two parts can realize adjustment work, such as lifting of a chair back, adjustment of the seat depth of the chair back and the like; the mechanism does not need to be operated by a switch, and only needs to directly operate the components to enable the two components to relatively move, so that the operation is simple; the state switching assembly can switch the matching state between the clamping pin and the clamping groove, so that the clamping pin is in a working state, a plurality of clamping grooves are in gear, the clamping pin moves between the clamping grooves according to the gear and moves relatively, the clamping pin can be separated from the clamping grooves when being switched to a locking state, and the clamping pin directly passes through the clamping grooves to return to an initial position, thereby being beneficial to adjustment and convenient to operate.

Preferably, the state switching component comprises a working spring and a locking spring, the working spring and the locking spring act on the clamping pin in opposite directions, and the working spring is arranged on one side of the clamping pin away from the clamping groove and applies elastic force towards the clamping groove to the clamping pin; the locking spring is arranged on one side of the bayonet close to the bayonet and applies elastic force to the bayonet far away from the bayonet; when the bayonet lock is in the working state, the working spring and the locking spring act on the bayonet lock together, and the whole bayonet lock receives the elasticity towards the bayonet lock; when the bayonet is in a locked state, the locking spring acts on the bayonet to enable the bayonet to leave the clamping groove. The working spring and the locking spring apply elastic forces in different directions to the bayonet lock so as to switch the state of the bayonet lock, so that the bayonet lock can be clamped with the clamping groove and can be switched between the clamping grooves, the bayonet lock can be separated from the clamping groove, the state switching of the bayonet lock is realized at low cost, and the operation is simplified.

Preferably, the gear engaging member further comprises a base connected with the sliding block, wherein the two end surfaces of the base are respectively provided with a containing groove and an opening, the opening faces the clamping groove, and the containing groove is communicated with the opening; the clamping pin is arranged in the opening in a sliding manner and performs telescopic movement; the state switching component is arranged in the accommodating groove and acts on the clamping pin.

Preferably, the state switching assembly further comprises a rotating seat and a jacking seat, both of which are arranged in the accommodating groove; the jacking seat is arranged on the clamping pin, and two ends of the locking spring respectively lean against the bottoms of the jacking seat and the accommodating groove; the rotating seat is positioned at one side of the jacking seat, which is opposite to the bayonet lock, and the working spring acts on the rotating seat and enables the rotating seat to be close to the jacking seat; the rotating seat and the jacking seat are matched through an inclined plane, so that the jacking seat jacks the rotating seat, and the rotating seat can rotate.

Preferably, at least one guide groove and at least one locking groove are arranged on the inner wall of the accommodating groove, and the guide groove and the locking groove are adjacently arranged along the circumferential direction; the jacking seat is provided with a guide block which is arranged in the guide groove and slides in the guide groove along with the movement of the bayonet lock; the rotating seat is provided with a state switching tooth, the state switching tooth is switched between the guide groove and the locking groove along with the rotation of the rotating seat, and the guide groove or the locking groove limits the rotation of the rotating seat when the state switching tooth is positioned in the guide groove or the locking groove; when the state switching teeth enter the guide grooves, the state switching assembly is in a working position, and the elastic force of the working spring is exerted on the jacking seat through the rotating seat and resists the elastic force of the locking spring to enable the clamping pin to be integrally subjected to the elastic force towards the clamping groove; when the state switching teeth enter the locking groove, the state switching assembly is in a locking position, the elastic force of the working spring is applied to the locking groove, and the clamping pin is separated from the clamping groove by the elastic force of the locking spring. The cooperation of jack-up seat and rotation seat makes the rotation seat can switch the position between guide slot and locking groove to the direction of the joint force of working spring and locking spring to bayonet lock is decided from this, realizes the switching of bayonet lock state.

Preferably, the jacking seat is also provided with jacking teeth, and when the jacking seat jacks the rotating seat, the jacking teeth are in contact fit with the tooth surfaces of the state switching teeth; when the jack-up tooth pushes the state switching tooth out of one of the guide groove or the locking groove, the rotary seat rotates to enable the state switching tooth to enter the other of the guide groove or the locking groove.

Preferably, the guide blocks protrude from the jacking seat and the jacking teeth in the radial direction; the jack-up teeth axially protrude from the jack-up seat and the guide block. The guide block protrudes and is always positioned in the guide groove, so that the jacking seat can only move along the length direction of the guide groove and cannot rotate, and the rotating seat can normally rotate and can be switched between the guide groove and the locking groove.

Preferably, the bottom of the guide groove is closer to the bottom surface of the receiving groove than the locking groove. When the state switching teeth enter the locking grooves, the working springs only can act on the base, but cannot apply elastic force to the clamping pins, so that the clamping pins are in a retracted locking state; when the state switching teeth enter the guide grooves, the working springs can act on the clamping pins, so that the clamping pins are in a working state capable of being clamped with the clamping grooves.

Preferably, the accommodating groove is closed by an end cover, and the end cover is in clamping fit with the accommodating groove by a clamping hole of a clamping buckle; the two ends of the working spring are respectively abutted against the end cover and the rotating seat.

Preferably, the gear piece comprises a latch section, a jacking section and a resetting section, and the clamping grooves are distributed on the latch section; the jacking section is configured to enable the state switching assembly to be switched from the working position to the locking position, and when the bayonet is moved from the jacking section to the resetting section and passes through the latch section, the bayonet is in a locking state, and the bayonet directly passes through the latch section; the reset section is configured to switch the state switching assembly from the locked state to the working position, and the bayonet is in a working state when the bayonet passes through the latch section by moving from the reset section to the jack-up section, and the bayonet switches positions among the slots.

A seat comprising a back adjustment assembly for a seat as described above, the first component being a back support of the seat; the second component is a back support of the seat configured to support the body of the back support; the back support piece is arranged at the front side of the back support and is configured to support the waist and the back of a human body; the upper part of the back support is connected with the upper end of the back support, the lower end of the back support moves in an opening and closing mode relative to the back support, and when the lower end of the back support opens forwards, a large included angle is formed between the whole back support and the back support; when the lower ends of the back support pieces are closed backwards, a small included angle is formed between the whole back support piece and the back support; a connecting rod is further arranged between the back support piece and the back support frame, one end of the connecting rod is rotationally connected with the back support piece, the other end of the connecting rod is connected with the gear shifting piece, and the sliding chute and the gear shifting piece are arranged on the back support frame; when the back support piece is opened forwards or closed backwards, the other end of the connecting rod moves along the sliding groove.

Preferably, the upper part of the back support is rotationally connected with the upper end of the back support through a ball head or a rotating shaft, and when the back support performs opening and closing movement, the other end of the connecting rod moves up and down along a sliding groove on the back support.

The design starting point, the idea and the beneficial effects of the invention adopting the technical scheme are as follows:

1. different functions of the furniture are realized by changing the relative positions of two parts or components on the furniture, and the gear of the sliding gear mechanism can be respectively connected to the two parts, so that the relative positions of the two parts can be changed, the two parts can be supported to maintain the position between the two parts at the moment, and the furniture can obtain different states and functions, such as lifting of a chair back, adjustment of the seat depth of the chair back and the like, through the different relative positions of the two parts.

2. The mechanism has the advantages of low cost, high modularization degree, wide application range and simple and quick assembly, and is beneficial to improving the production efficiency.

3. The state switching component can enable the bayonet lock to switch between the working state and the locking state, when the bayonet lock is switched to the working state, the bayonet lock can be matched with the clamping groove in a clamping mode and can be switched between the clamping grooves, when the bayonet lock is switched to the locking state, the bayonet lock is separated from the clamping groove, and the bayonet lock can directly return to the initial position, so that the regulation is facilitated, and the operation is convenient.

Drawings

Fig. 1 is a schematic perspective view of the lumbar support assembly according to embodiment 1 of the present invention;

FIG. 2 is a side view showing the adjustment of the lumbar support height of the lumbar support assembly according to the present invention in example 1;

Fig. 3 is a schematic perspective view of the upper back assembly and the lifting frame in embodiment 1;

Fig. 4 is a schematic perspective view of the mounting groove of the embodiment 1 of the present invention formed on the back support;

FIG. 5 is a schematic perspective view of the engaging member and the gear member in the embodiment 1 of the present invention;

fig. 6 is a schematic perspective view of the base and its internal structure in embodiment 1 of the present invention;

FIG. 7 is a schematic perspective view of the position of the working spring and the locking spring relative to the bayonet in embodiment 1;

FIG. 8 is a cross-sectional view of the shift register of embodiment 1 of the present invention;

Fig. 9 is a schematic perspective view of the jack-up seat and the bayonet according to the embodiment 1 of the present invention;

Fig. 10 is a schematic perspective view of a rotary seat according to embodiment 1 of the present invention;

FIG. 11 is a cross-sectional view of the shift register of the invention in the operating state of the bayonet of example 1;

FIG. 12 is a cross-sectional view showing the relative positions of the jack-up teeth and the state switching teeth when the bayonet in the working state of example 1 of the present invention;

FIG. 13 is a sectional view showing the state switching teeth positioned in the guide groove when the bayonet lock is in the operating state in embodiment 1 of the present invention;

FIG. 14 is a cross-sectional view of the shift register of the invention when the bayonet is shifted from the operating state to the locked state in example 1;

Fig. 15 is a sectional view showing the relative positions of the jack-up teeth and the state switching teeth when the bayonet is switched from the operating state to the locked state in embodiment 1 of the present invention;

FIG. 16 is a sectional view showing the state switching teeth being pushed out of the guide grooves when the bayonet lock is switched from the operating state to the locked state in embodiment 1 of the present invention;

FIG. 17 is a cross-sectional view of the catch member of the present invention in the locked state of the bayonet of example 1;

FIG. 18 is a cross-sectional view showing the relative positions of the jack-up teeth and the state switching teeth when the bayonet lock is in the locked state in embodiment 1 of the present invention;

FIG. 19 is a sectional view showing the state switching teeth in the lock groove when the bayonet lock is in the locked state in embodiment 1 of the present invention;

FIG. 20 is a cross-sectional view of the gear in embodiment 1 of the present invention;

fig. 21 is a schematic view showing the use state of the present invention in embodiment 2.

The reference numerals are as follows: a back support 1; an upper back assembly 21; a lifting frame 301; a gear member 302; a gear 303; a card slot 304; a bayonet 305; a base 306; a rotating seat 307; jack-up seat 308; a working spring 309; a locking spring 310; the accommodating groove 311; an opening 312; a mounting groove 313; a guide slot 314; a locking groove 315; a guide block 316; status switching teeth 317; latch segment 318; jacking segment 319; a reset segment 320; jacking up the inclined surface 321; reset ramp 322; an end cap 323; the teeth 324 are jacked up.

Detailed Description

In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, the term "at least one" refers to one or more, unless explicitly defined otherwise. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The specific embodiments of the present invention are as follows:

Example 1: as shown in fig. 5, the present invention firstly provides a sliding gear mechanism, which comprises a gear member 302 and a gear member 303, wherein the gear member 303 and the gear member 302 are slidably matched with each other through a sliding block and a sliding groove, and the gear member 303 and the gear member 302 are respectively connected to two furniture components, so that the relative movement between the two components can be realized, and the furniture has a new adjustable function.

Specifically, as shown in fig. 8 and 20, a plurality of clamping grooves 304 distributed along the sliding direction are formed on the gear member 302, the gear member 303 includes elastic clamping pins 305 engaged with the clamping grooves 304, and when the gear member 303 and the gear member 302 slide relatively, the clamping pins 305 switch positions between the clamping grooves 304; the gear member 302 further comprises a latch segment 318, a jack-up segment 319 and a reset segment 320, wherein the latch grooves 304 are distributed on the latch segment 318; the jack-up section 319 has jack-up inclined plane 321, and the reset section 320 has reset inclined plane 322, and the highest point of jack-up inclined plane 321 and reset inclined plane 322 is higher than latch section 318, and jack-up inclined plane 321 and reset inclined plane 322 are opposite to each other, and the inclination direction is roughly opposite.

As shown in fig. 6-10, the shift member 303 further includes a state switching assembly configured to change the mating relationship of the bayonet 305 and the slot 304; the state switching component is provided with a working position and a locking position which can be mutually switched, when the state switching component is positioned at the working position, the clamping pin 305 is positioned at the working state, and the clamping pin 305 receives elastic force towards the clamping groove 304; when the state switching component is positioned at the locking position, the clamping pin 305 is positioned at the locking state, and the clamping pin 305 is subjected to reverse elastic force; the jack-up section 319 is configured to switch the state switching assembly from the operating position to the locked position, and when the bayonet 305 moves from the jack-up section 319 to the reset section 320 past the latch section 318, the bayonet 305 is in the locked state, and the bayonet 305 directly passes over the latch section 318; the reset segment 320 is configured to switch the state switching assembly from the locked position to the operational position, and the latch 305 is in the operational state when the latch 305 passes the latch segment 318 by moving from the reset segment 320 to the jack segment 319, and the latch 305 switches positions between the detents 304.

The gear 302 and the gear 303 are respectively connected to two different components, so that the two components can realize adjustment work, such as lifting of a chair back, adjustment of the seat depth of the chair back and the like; the mechanism does not need to be operated by a switch, and only needs to directly operate the components to enable the two components to relatively move, so that the operation is simple; because the state switching component can switch the matching state between the clamping pin 305 and the clamping groove 304, when the clamping pin 305 is in a working state, a plurality of clamping grooves 304 are in a gear, the clamping pin 305 moves between the clamping grooves 304, namely, the two components move relatively according to the gear, when the clamping pin 305 is switched to a locking state, the clamping pin 305 can be separated from the clamping groove 304 and directly returns to the initial position after passing through a plurality of clamping grooves 304, thereby being beneficial to adjustment and convenient to operate.

The gear 303 comprises a base 306 connected with the sliding block, two end surfaces of the base 306 are respectively provided with a containing groove 311 and an opening 312, the opening 312 faces the clamping groove 304, and the containing groove 311 is communicated with the opening 312; the cross sections of the opening 312 and the accommodating groove 311 are circular, and the groove diameter of the accommodating groove 311 is larger than the caliber of the opening 312; the bayonet 305 is slidably disposed in the opening 312 and is capable of telescopic movement; the state switching component is arranged in the accommodating groove 311 and acts on the bayonet 305; specifically, the state switching assembly includes a working spring 309, a locking spring 310, a rotating seat 307 and a jack-up seat 308, all of which are located in a receiving groove 311, and the locking spring 310, the jack-up seat 308, the rotating seat 307 and the working spring 309 are respectively arranged from the approach of the bayonet 305 to the separation of the bayonet 305, wherein the jack-up seat 308 and the bayonet 305 are integrally formed; the working spring 309 and the locking spring 310 act on the bayonet 305 in opposite directions, and the working spring 309 is disposed on a side of the bayonet 305 away from the bayonet 304 and applies an elastic force to the bayonet 305 toward the bayonet 304; the locking spring 310 is disposed at one side of the bayonet 305 near the bayonet 304 and applies an elastic force to the bayonet 305 away from the bayonet 304; when the bayonet 305 is in the operating state, the operating spring 309 and the locking spring 310 act together on the bayonet 305 and the bayonet 305 is wholly subjected to elastic force toward the bayonet 304; when the bayonet 305 is in the locked state, the locking spring 310 acts on the bayonet 305 to move the bayonet 305 out of the slot 304.

The working spring 309 and the locking spring 310 apply elastic forces in different directions to the bayonet 305, so as to switch the state of the bayonet 305, so that the bayonet 305 can be clamped with the clamping groove 304 and switch positions between the clamping grooves 304, and the bayonet 305 can be separated from the clamping groove 304, thereby realizing the state switching of the bayonet 305 at low cost and simplifying operation.

Further, two ends of the locking spring 310 respectively abut against the jacking seat 308 and the bottom surface of the accommodating groove 311; the rotating seat 307 is positioned at one side of the jacking seat 308 facing away from the bayonet 305, and the working spring 309 acts on the rotating seat 307 and brings the rotating seat 307 close to the jacking seat 308; the rotation seat 307 and the jack-up seat 308 are matched through inclined planes, so that the rotation seat 307 can rotate after the jack-up seat 308 jacks up the rotation seat 307.

As shown in fig. 6 and 11-19, four guide grooves 314 and four locking grooves 315 are formed in the inner wall of the accommodating groove 311, and the guide grooves 314 and the locking grooves 315 are arranged adjacent to each other in the circumferential direction; four guide blocks 316 are arranged on the jacking seat 308, the guide blocks 316 are arranged in the guide grooves 314, and the guide blocks 316 slide in the guide grooves 314 along with the movement of the clamping pins 305; the rotating seat 307 is provided with a state switching tooth 317, the state switching tooth 317 is switched between the guide groove 314 and the locking groove 315 along with the rotation of the rotating seat 307, and the guide groove 314 or the locking groove 315 limits the rotation of the rotating seat 307 when the state switching tooth 317 is positioned in the guide groove 314 or the locking groove 315; the accommodating groove 311 is closed by an end cover 323, and the end cover 323 is in clamping fit with the accommodating groove 311 through a clamping hole; the two ends of the working spring 309 respectively lean against the end cover 323 and the rotating seat 307; when the state switching tooth 317 enters the guide groove 314, the state switching assembly is in the working position, the elastic force of the working spring 309 is applied to the jack-up seat 308 through the rotating seat 307 and resists the elastic force of the locking spring 310 to make the bayonet 305 entirely receive the elastic force toward the bayonet 304; when the state switching tooth 317 enters the locking groove 315, the state switching assembly is in a locked position, the elastic force of the working spring 309 is applied to the locking groove 315, and the bayonet 305 is separated from the bayonet 304 by the elastic force of the locking spring 310; the cooperation of the jack-up seat 308 and the rotating seat 307 enables the rotating seat 307 to switch positions between the guide groove 314 and the locking groove 315, and thus determines the direction of force applied by the working spring 309 and the locking spring 310 to the bayonet 305 together, so as to realize the switching of the states of the bayonet 305; the bottom of the guide groove 314 is closer to the bottom surface of the receiving groove 311 than the locking groove 315; when the state switching tooth 317 enters the locking groove 315, the working spring 309 only acts on the base 306 and cannot apply elastic force to the bayonet 305, so that the bayonet 305 is in a retracted locking state; when the state switching tooth 317 enters the guide groove 314, the working spring 309 can act on the bayonet 305, so that the bayonet 305 is in a working state capable of being engaged with the slot 304.

The jack-up seat 308 is also provided with jack-up teeth 324, and when the jack-up seat 308 jacks up the rotating seat 307, the jack-up teeth 324 are in contact fit with the tooth surfaces of the state switching teeth 317; when the jack teeth 324 jack the state switching teeth 317 out of one of the guide grooves 314 or the locking grooves 315, the rotation base 307 rotates to make the state switching teeth 317 enter the other of the guide grooves 314 or the locking grooves 315; the guide blocks 316 radially protrude from the jack-up seats 308 and jack-up teeth 324; the jack-up teeth 324 axially protrude from the jack-up seat 308 and the guide block 316; the guide 316 protrudes and the guide 316 is always located in the guide 314, which makes the jack-up seat 308 only move along the length direction of the guide 314 and cannot rotate, so that the rotating seat 307 can rotate normally and switch between the guide 314 and the locking slot 315.

As shown in fig. 11-19, when the bayonet 305 is switched between the slots 304, the working spring 309 cooperates with the locking spring 310 to act on the bayonet 305 and subject the bayonet 305 to the elastic force toward the slot 304, and the state switching teeth 317 are located in the guide grooves 314 and pressed against the jack-up teeth 324, so that each time the bayonet 305 is switched to the next slot 304, the bayonet 305 stretches out and draws back in the opening 312 and finally engages with the slot 304; when the bayonet lock 305 reaches the jack-up section 319, the bayonet lock 305 slides on the jack-up inclined surface 321 and drives the jack-up seat 308 to jack up the rotating seat 307, when the state switching tooth 317 is pushed out of the guide groove 314 by the jack-up tooth 324, the state switching tooth 317 slides and drives the rotating seat 307 to rotate due to the inclined surface fit between the state switching tooth 317 and the jack-up tooth 324, the state switching tooth 317 also rotates into the locking groove 315, at the moment, the rotating seat 307 is blocked by the locking groove 315 and cannot be in extrusion contact with the jack-up seat 308, the working spring 309 cannot act on the bayonet lock 305, the bayonet lock 305 is only subjected to the elasticity of the locking spring 310 and integrally retracted into the base 306, but the bayonet lock 305 still protrudes out of the base 306, and at the moment, the bayonet lock 305 is separated from the locking groove 304 and can directly pass through the bayonet lock section 318 to reach the reset section 320; when the bayonet lock 305 reaches the reset segment 320, the bayonet lock 305 slides on the reset inclined plane 322 and drives the jack-up seat 308 to jack up the rotating seat 307, when the state switching tooth 317 is pushed out of the locking slot 315 by the jack-up tooth 324, the state switching tooth 317 slides and drives the rotating seat 307 to rotate due to the inclined plane fit between the state switching tooth 317 and the jack-up tooth 324, the state switching tooth 317 also rotates into the guide slot 314, at this time, the state switching tooth 317 presses the jack-up tooth 324 due to the elasticity of the working spring 309, the bayonet lock 305 is again subjected to the elasticity of the working spring 309 and protrudes out of the base 306 more, and the whole bayonet lock 305 is subjected to the elasticity action towards the clamping slot 304 to be clamped and matched with the clamping slot 304 again, and returns to the latch segment 318.

As shown in fig. 1 to 5, in the present embodiment, the sliding gear mechanism is used in the seatback assembly, and the lifting adjustment of the upper back assembly 21 in the seatback assembly is realized; the chair back assembly comprises a back support 1 and an upper back assembly 21, the back support 1 comprises a lifting frame 301 for arranging the upper back assembly 21 and a mounting groove 313 for accommodating the lifting frame 301, the lifting frame 301 can lift in the mounting groove 313 and drive the upper back assembly 21 to lift, the lifting frame 301 can be regarded as the sliding block, and the mounting groove 313 can be regarded as the sliding groove; the gear member 302 is disposed in the mounting groove 313, and the gear member 303 is disposed on the lifter 301; when the upper back assembly 21 rises, the clamping pin 305 of the gear shifting piece 303 is in clamping fit with the clamping groove 304 of the gear shifting piece 302 and is in an upward switching position between the clamping grooves 304, and the upper back assembly 21 rises according to the gear shifting; when the upper back assembly 21 reaches the highest position, that is, the bayonet 305 is jacked up by the jacking inclined plane 321 to switch to the locking state, the upper back assembly 21 can be directly lowered to the initial position; when the lower back assembly is lowered to the initial position, the bayonet 305 is switched back to the working state by the reset inclined plane 322, and the upper back assembly 21 can be raised again according to the gear position, and the cycle is repeated.

Example 2: unlike embodiment 1, this embodiment discloses another application, as shown in fig. 21, this embodiment discloses a seat comprising a back adjustment assembly, the first component being a back support 51 of the seat; the second component is a back bracket 52 of the seat configured to support the main body of the back support 51; the back support piece 51 is arranged at the front side of the back support 52 and is configured to support the waist and back of a human body; the upper part of the back support 52 is connected to the upper end of the back support 51, the lower end of the back support 51 moves in an opening and closing manner relative to the back support 52, and when the lower end of the back support 51 is opened forwards, a large included angle is formed between the whole back support 51 and the back support 52; when the lower ends of the back support pieces 51 are closed backwards, a small included angle is formed between the whole back support pieces 51 and the back support 52; the first component, namely the back support piece 51 is indirectly connected with the gear shifting piece 303, a connecting rod 53 is further arranged between the back support piece 51 and the back support 52, one end of the connecting rod 53 is rotationally connected with the back support piece 51, the other end of the connecting rod 53 is connected with the gear shifting piece 303, and a sliding groove and a gear shifting piece are arranged on the back support 52; when the back support 51 is opened forward or closed backward, the other end of the link 53 moves along the chute; the constitution of the gear and the state switching assembly is described in embodiment 1.

Claims (7)

1. A back adjustment assembly for a seat, characterized by: the chair back adjusting assembly comprises a first part and a second part which move relatively, the first part is connected with a gear, the second part is connected with a gear, and the gear are in sliding fit through a sliding block and a sliding groove, so that the first part and the second part move relatively; the gear engaging piece comprises a base connected with the sliding block, two end faces of the base are respectively provided with a containing groove and an opening, the opening faces the clamping groove, and the containing groove is communicated with the opening; the inner wall of the accommodating groove is provided with at least one guide groove and at least one locking groove, and the guide groove and the locking groove are adjacently arranged along the circumferential direction; the gear piece comprises a latch section, a jacking section and a resetting section, a plurality of clamping grooves distributed along the sliding direction are formed in the gear piece, and the clamping grooves are distributed on the latch section; the gear engaging piece further comprises a state switching component and a clamping pin which is matched with the clamping groove in a clamping way and has elasticity, and the clamping pin is arranged in the opening in a sliding way and performs telescopic movement; the state switching assembly comprises a working spring, a locking spring, a rotating seat and a jacking seat which are all arranged in the accommodating groove, wherein the jacking seat is arranged on the clamping pin, a guide block is arranged on the jacking seat and is arranged in the guide groove, and the guide block slides in the guide groove along with the movement of the clamping pin; the rotating seat is positioned at one side of the jacking seat, which is opposite to the clamping pin, and the working spring acts on the rotating seat and enables the rotating seat to be close to the jacking seat, so that the clamping pin is applied with elastic force towards the clamping groove; the two ends of the locking spring respectively lean against the jacking seat and the bottom surface of the accommodating groove, so that elastic force far away from the clamping groove is applied to the clamping pin; the rotating seat and the jacking seat are matched through an inclined plane, so that the rotating seat can rotate after the jacking seat jacks the rotating seat; the rotating seat is provided with a state switching tooth, the state switching tooth is switched between the guide groove and the locking groove along with the rotation of the rotating seat, and the guide groove or the locking groove limits the rotation of the rotating seat when the state switching tooth is positioned in the guide groove or the locking groove; the state switching component is provided with a working position and a locking position which can be mutually switched, the jacking section is configured to enable the state switching component to be switched from the working position to the locking position, and the resetting section is configured to enable the state switching component to be switched from the locking position to the working position; when the state switching teeth enter the guide grooves, the state switching assembly is positioned at a working position, the clamping pin is positioned at a working state, and the gear engaging piece and the gear shifting piece slide relatively, so that the clamping pin moves from the reset section to the jacking section and passes through the clamping tooth section; at the moment, the elastic force of the working spring is exerted on the jacking seat through the rotating seat and resists the elastic force of the locking spring, so that the whole bayonet lock is subjected to the elastic force towards the bayonet slots and the positions of the bayonet slots are switched; when the state switching teeth enter the locking grooves, the state switching assembly is located in the locking position, the clamping pins are in the locking state, the elastic force of the working springs is applied to the locking grooves, the clamping pins leave the clamping grooves under the elastic force of the locking springs, and the jacking section directly passes through the clamping tooth section to move towards the resetting section.

2. The back adjustment assembly for a seat of claim 1, wherein: the jacking seat is also provided with jacking teeth, and when the jacking seat jacks the rotating seat, the jacking teeth are in contact fit with tooth surfaces of the state switching teeth; when the jack-up tooth pushes the state switching tooth out of one of the guide groove or the locking groove, the rotary seat rotates to enable the state switching tooth to enter the other of the guide groove or the locking groove.

3. The back adjustment assembly for a seat of claim 2, wherein: the guide block protrudes out of the jacking seat and the jacking teeth along the radial direction; the jack-up teeth axially protrude from the jack-up seat and the guide block.

4. The back adjustment assembly for a seat of claim 1, wherein: the bottom of the guide groove is closer to the bottom surface of the accommodating groove than the locking groove.

5. The back adjustment assembly for a seat of claim 1, wherein: the accommodating groove is closed by an end cover, and the end cover is in clamping fit with the accommodating groove by a clamping hole of the clamping buckle; the two ends of the working spring are respectively abutted against the end cover and the rotating seat.

6. A seat comprising a back adjustment assembly for a seat as claimed in any one of claims 1 to 5, the first component being a back support of the seat; the second component is a back support of the seat configured to support the body of the back support; the back support piece is arranged at the front side of the back support and is configured to support the waist and the back of a human body; the upper part of the back support is connected with the upper end of the back support, the lower end of the back support moves in an opening and closing mode relative to the back support, and when the lower end of the back support opens forwards, a large included angle is formed between the whole back support and the back support; when the lower ends of the back support pieces are closed backwards, a small included angle is formed between the whole back support piece and the back support; a connecting rod is further arranged between the back support piece and the back support frame, one end of the connecting rod is rotationally connected with the back support piece, the other end of the connecting rod is connected with the gear shifting piece, and the sliding chute and the gear shifting piece are arranged on the back support frame; when the back support piece is opened forwards or closed backwards, the other end of the connecting rod moves along the sliding groove.

7. The seat according to claim 6, wherein: the upper part of the back support is rotationally connected with the upper end of the back support through a ball head or a rotating shaft, and when the back support performs opening and closing movement, the other end of the connecting rod moves up and down along a sliding groove on the back support.