CN217039433U - Chair inclination locking device - Google Patents

Abstract

The utility model discloses a chair inclination locking device, which comprises a base and a back support, wherein the front end of the back support is rotationally connected with the rear end of the base so as to lead the back support to rotate in an inclination way relative to the base; an inserting mechanism used for locking the back support at a sitting position or a backward-leaning position is arranged between the base and the back support, and the inserting mechanism comprises a socket arranged on the back support and an inserting tongue correspondingly arranged on the base. In the chair inclination and elevation locking device, the back support can rotate relative to the base in an inclination and elevation manner, the back support is provided with the socket, and the rear end of the base is provided with the inserting tongue which can be adjusted in a telescopic manner; the socket is provided with an upper slot and a lower slot which are spaced up and down; the back support can be effectively locked at a sitting position or a backward-leaning position by controlling the inserting tongue to be inserted into the lower inserting groove or the upper inserting groove, and the back support is simple and reliable in structure and convenient to operate.

Description

Chair tilting locking device

Technical Field

The utility model relates to a thing to sit on field, in particular to seat inclines to face upward locking device.

Background

With the improvement of living standard, people have higher and higher functional requirements on office chairs. In order to meet the requirement that users can change sitting postures with different inclination angles, a chassis is arranged below the chair seats of a plurality of office chairs, the chair back can be controlled to incline and incline within a certain angle range, and the chair back needs to be locked when inclined and inclined to a certain position. The mechanism is characterized in that a control rod extending out of a chassis is used as a locking pin to lock the mechanism, locking holes corresponding to the inclined positions are formed in a bottom plate and a movable seat of the chassis, the mechanism is low in strength of the movable seat and the bottom plate and easy to deform, a plurality of mechanisms are single-side locked and fixed, stability is poor, and inconvenience is brought to a user. Or some seats which adopt pull wires to realize the leaning and leaning locking of the chair back are adopted, but the control structure is a complex structure with various accessories and complex structure in the chassis, the occupied space is large, and the cost is increased.

Chinese utility model patent CN201921284797.7 discloses a "chair tray capable of locking by tilting backwards", including: the chassis and the first connecting part which are not hinged at the end parts, and the positioning rod used for locking the relative positions of the chassis and the first connecting part are provided with second connecting parts, the end parts of the second connecting parts are hinged with the end parts of the first connecting parts, the front parts of the second connecting parts are hinged with the end parts of the chassis, the relative positions of the chassis and the first connecting parts, which are locked by the positioning rod, are at least two, namely, the included angles of the chassis and the first connecting parts are different under each relative position. The beneficial effects of the utility model reside in that, can lock the position of seat support under the state of leaning back, strengthened user's experience degree. The chassis realizes the backward tilting locking through the locking control of the positioning rod, the occupied space is large, and the structural stability has hidden danger; the user is required to bend down to control the positioning rod during operation, and the use is inconvenient.

Chinese patent of CN202110569761.9 discloses a "chair back adjusting mechanism", which includes a base for connecting a chair seat, and a back frame capable of leaning back; the upper part of the front end of the chair back frame is hinged with the rear section of the base, and the lower part of the front end is provided with a swinging rod which extends left and right and penetrates through two side parts of the base; a main push rod and a movable first locking mechanism which extend forwards and backwards are arranged in the base, the rear end of the main push rod is movably connected with the swinging rod, a plurality of first locking nodes are arranged at intervals in the front and back direction of the front section of the main push rod, and the first locking mechanism can be connected with or separated from the first locking nodes in the movable range of the first locking mechanism; at least one group of locking seats, a second elastic compression structure and a movable second locking mechanism are arranged in the base, the second elastic compression structure is supported between the swinging rod and the locking seats, and the second locking mechanism can be connected with or separated from the locking seats. The angle locking of forward tilting and backward tilting can be realized through the engagement of the first locking mechanism and the main push rod; however, the main push rod and the locking mechanism are arranged in the chassis, so that the structure is various, and the internal space of the chassis is undoubtedly occupied; the installation is inconvenient.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provide a seat leaning and pitching locking device with simple and stable structure, wherein a socket is arranged on a back bracket, and an upper slot and a lower slot are arranged on the socket; the base is correspondingly provided with a telescopic and adjustable inserting tongue; the back support can be effectively locked at a sitting position or a backward position by controlling the insertion tongue to be inserted into the lower insertion groove or the upper insertion groove; simple structure is reliable, and the slot controls through the stay wire control mechanism for convenient operation.

The technical scheme of the utility model is realized like this:

a chair tilting locking device comprises a base and a back support, wherein the front end of the back support is rotatably connected with the rear end of the base so that the back support can tilt and rotate relative to the base; an inserting mechanism used for locking the back support at a sitting position or a backward position is arranged between the base and the back support, and the inserting mechanism comprises a socket arranged on the back support and an inserting tongue correspondingly arranged on the base; a pull control mechanism for controlling the extension of the inserting tongue is arranged in the base; an upper slot and a lower slot which are spaced up and down are arranged in the socket; the inserting tongue is inserted in the lower inserting groove in the sitting position; when the back support is in a backward-leaning position, the pull line control mechanism controls the plug tongue to exit from the lower slot, and the back support rotates backward and enables the plug tongue to be plugged into the upper slot.

Preferably, the socket and the back support are detachably connected, a mounting groove is correspondingly formed in the back support, and the socket is embedded in the mounting groove. The socket can be independently demoulded and molded and then installed with the back bracket, so that the processing is more convenient; if the socket and the back support are integrally formed, the socket is difficult to be integrally demoulded and an upper slot and a lower slot are formed at the front end of the back support; thereby reducing the processing and manufacturing difficulty and optimizing the process.

Preferably, a clamping block extending backwards is arranged at the rear end of the socket, and a clamping groove is formed in the corresponding position of the back support; the socket is embedded into the mounting groove so that the clamping block is clamped in the clamping groove; and the socket and the back support are fixedly connected by screws. The connection strength of the socket and the back support is stable, the back support can be effectively locked by inserting the inserting tongue and the socket, and the structural strength is guaranteed.

Preferably, the pull wire control mechanism comprises a pull wire, a sliding control piece and a reset torsion spring; the pull wire is connected to the sliding control piece and acts on the sliding control piece to slide relative to the base; the reset torsion spring is arranged between the sliding control piece and the inserting tongue and comprises a first torsion arm and a second torsion arm, the first torsion arm is relatively fixed with the base, and the second torsion arm extends and is connected to the inserting tongue; the sliding control piece and the second torque arm form linkage fit, and the pull wire pulls the sliding control piece to slide forwards to simultaneously act on the second torque arm to bend forwards and deform and drive the plug tongue to exit the socket; the reset torsion spring correspondingly generates elastic torsion to provide reset elasticity for the plug tongue to be inserted into the socket again.

Preferably, the second torque arm comprises an extension section, a connecting section and a bending section between the extension section and the connecting section; the extension section is arranged along the horizontal direction, and the rear end of the sliding control piece is connected to the extension section; the connecting section extends backwards and is connected to the inserting tongue; when the second torque arm is deformed, the bending sections are simultaneously elastically deformed to provide restoring elasticity acting on the connecting section. A bending section is added, so that when the pull wire pulls the sliding control piece and acts on the second torque arm to move, the extension section bends and deforms to drive the connecting section to move, and meanwhile, the bending section between the extension section and the connecting section elastically deforms; then when the pulling wire is loosened, the bending section also provides restoring elasticity to accelerate the restoring speed of the connecting section, so that the inserting tongue can perform restoring action more quickly.

Preferably, a containing groove is formed in the base, and the sliding control piece and the reset torsion spring are arranged in the containing groove; the base also comprises an upper cover used for covering the containing groove; the sliding control part is provided with a sliding groove, and the bottom of the upper cover is provided with a guide block which extends downwards and is in sliding fit with the sliding groove; and the reset torsion spring is arranged on the upper cover. The sliding control piece is in sliding fit with the upper cover, so that the sliding control piece can stably slide back and forth.

Preferably, the insertion tongue is slidably disposed between the upper cover and the base, a guide groove is disposed on the insertion tongue along the front-back direction, and a guide post extending out of the guide groove is disposed on the upper cover or the base. So that the tongue can stably slide in the front-rear direction.

Preferably, a clamping seat extending downwards is arranged at the rear end of the sliding control piece, the extension section is clamped in the clamping seat, and the extension section and the sliding control piece keep synchronous movement in the front-rear direction. The sliding control piece is clamped with the extension section, the sliding control piece is controlled to directly act on the deformation of the extension section, and the reaction is rapid.

Preferably, the rear end of the base is provided with a rotating part, and the front end of the back bracket is correspondingly provided with two rotating seats at intervals; the rotating part is positioned between the two rotating seats and is in rotating fit with the two rotating seats through a rotating shaft.

Preferably, the rotating shaft horizontally penetrates through the rotating part, and two ends of the rotating shaft respectively penetrate through the rotating part; the inner side wall of the single rotating seat is correspondingly provided with a rotating groove, and the penetrating end of the rotating shaft is rotatably matched in the rotating groove.

Adopted above-mentioned technical scheme the utility model discloses a design departure point, theory and beneficial effect are:

firstly, in the chair inclination locking device of the utility model, the back support can rotate relative to the base, the socket is arranged on the back support, and the inserting tongue which can be adjusted in a telescopic way is arranged at the rear end of the base; the socket is provided with an upper slot and a lower slot which are spaced up and down; the back support can be effectively locked at a sitting position or a backward-bending position by controlling the insertion tongue to be inserted into the lower insertion groove or the upper insertion groove, and the back support is simple and reliable in structure and convenient to operate.

Secondly, the plug tongue is controlled by a pull wire control mechanism, the pull wire is pulled to drive the sliding control piece to slide forwards, and the sliding control piece acts on the bending deformation of the second torsion arm to drive the plug tongue to exit from the socket; and under the action of the reset torsion spring, enough reset elasticity can be provided, and the reset action of the plug tongue is effectively realized. Design benefit, overall structure is simple and occupation space not, can set up in the base that the space is little.

Moreover, the socket is detachably connected with the back support, and the upper slot and the lower slot are arranged in the socket, so that the socket can be independently subjected to demolding molding and then is installed with the back support, and the processing is more convenient; if the socket and the back support are integrally formed, the socket is difficult to integrally demould and an upper slot and a lower slot are formed at the front end of the back support; thereby reducing the processing and manufacturing difficulty and optimizing the process.

In addition, the second torque arm includes an extension segment, a connection segment, and a bending segment between the extension segment and the connection segment; when the pull wire is pulled, the extension section is bent to have a recovery trend, and meanwhile, the reset torsion spring correspondingly twists to provide reset elasticity, so that the enough recovery elasticity is provided to reset the insertion tongue; moreover, the bending section will also generate elastic deformation; when the pull wire is loosened, the bending section also provides restoring elasticity to accelerate the restoring speed of the connecting section, so that the latch can perform restoring action more quickly.

Drawings

Fig. 1 is a schematic perspective view of the connection between the base and the back support in the embodiment of the present invention;

fig. 2 is a schematic perspective view of a wire-pulling control mechanism in an embodiment of the present invention;

fig. 3 is a schematic perspective view of the inner part of the base according to the embodiment of the present invention;

fig. 4 is a schematic perspective view of a back support according to an embodiment of the present invention;

fig. 5 is a schematic perspective view illustrating a connection between a socket and a back bracket according to an embodiment of the present invention;

fig. 6 is a side sectional view of the embodiment of the present invention in which the tongue is inserted into the lower slot;

fig. 7 is a side sectional view of the embodiment of the present invention in which the insertion tongue is inserted into the upper insertion groove;

fig. 8 is a schematic perspective view of the pull-cord control mechanism engaged with the upper cover according to the embodiment of the present invention;

fig. 9 is a schematic perspective view of the bottom of the upper cover in the embodiment of the present invention;

fig. 10 is a schematic view of a pull control mechanism according to an embodiment of the present invention;

fig. 11 is a schematic perspective view of the reset torsion spring according to the embodiment of the present invention.

The various reference numbers are: a base 1; a rotating part 1 a; a back support 2; a rotating base 2 a; a socket 3; a tongue 4; an upper slot 5; a lower slot 6; a rotating shaft 7; a rotating groove 8; a mounting groove 9; a fixture block 10; a card slot 11; a pull wire 12; a housing groove 13; a slide control 14; a return torsion spring 15; a first torsion arm 15 a; a second torque arm 15 b; an upper cover 16; a guide block 17; a chute 18; a connecting seat 19; a fixed seat 20; an extension section 21; a connecting section 22; a card holder 23; a curved section 24; a guide groove 25; and a guide post 26.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

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

In the description of the present invention, the term "at least one" means 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 embodiment relates to the reference position of each part, and the position where the back support is located is used as the rear end as the benchmark.

The specific implementation manner of the utility model is as follows:

as shown in fig. 1-11, the present invention provides a seat tilting locking device, which comprises a base 1 and a back support 2, wherein the front end of the back support 2 is rotatably connected to the rear end of the base 1 so that the back support 2 can tilt relative to the base 1; wherein, base 1 is configured as the seat of connecting the seat, back support 2 is configured as the back of the chair of connecting. An inserting mechanism used for locking the back support 2 at a sitting position and a backward-leaning position is arranged between the base 1 and the back support 2, and comprises a socket 3 arranged on the back support 2 and an inserting tongue 4 correspondingly arranged on the base 1; a pull wire control mechanism for controlling the extension and retraction of the inserting tongue 4 is arranged in the base 1; an upper slot 5 and a lower slot 6 which are vertically spaced are arranged in the socket 3; then, the inserting tongue 4 is inserted in the lower inserting groove 6 in the sitting position; when the back support needs to be adjusted in a backward tilting mode, the inserting tongue 4 is controlled by the pull line control mechanism to exit from the lower slot 6, the back support 2 can rotate in a backward tilting mode relative to the base 1, and the inserting tongue 4 is controlled to be inserted into the upper slot 5 again, so that the back support 2 can be locked in the backward tilting position. Then the back support 2 can be effectively locked at a sitting position or a backward-leaning position by controlling the extension of the inserting tongue 4, the structure is simple and reliable, and the operation is convenient.

As shown in fig. 1-5, the rear end of the base 1 has a rotating part 1a, and the front end of the back bracket 2 is correspondingly provided with two rotating seats 2a spaced left and right; the rotating part 1a is positioned between the two rotating seats 2a, and the rotating part 1a is in rotating fit with the two rotating seats 2a through a rotating shaft 7; specifically, the method comprises the following steps: the rotating shaft 7 horizontally penetrates through the rotating part 1a, and two ends of the rotating shaft 7 respectively penetrate through the rotating part 1 a; a rotating groove 8 is correspondingly arranged on the inner side wall of the single rotating seat 2a, and the penetrating end of the rotating shaft 7 is rotatably matched in the rotating groove 8, so that the back bracket 2 can rotate relative to the base 1. The inserting tongue 4 is arranged at the rear end of the rotating part 1a and extends out of the base 1 backwards; socket 3 and back of the body support 2 between be connected for dismantling, specific saying: as shown in fig. 4-5, a mounting groove 9 is formed on the back bracket 2, and the socket 3 is inserted into the mounting groove 9; a clamping block 10 extending backwards is arranged at the rear end of the socket 3, and a clamping groove 11 is arranged at the corresponding position of the back bracket 2; when the socket is installed, the socket 3 is embedded into the installation groove 9, and the clamping block 10 is clamped in the clamping groove 11 backwards; the socket 3 is fixedly connected with the back bracket 2 through screws, and the openings of the upper slot 5 and the lower slot 6 face to the front; by adopting the connecting structure, the connecting strength between the socket 3 and the back support 2 is stable, the back support 2 can be effectively locked by inserting the inserting tongue 4 and the socket 3, and the structural strength is ensured. In addition, the socket 3 is detachably connected with the back support 2, so that the socket 3 can be independently subjected to mold stripping and molding and then is installed with the back support 2, and the processing is more convenient; if the socket 3 and the back support 2 are integrally formed, the socket is difficult to integrally demould and the front end of the back support 2 is provided with an upper slot 5 and a lower slot 6; thereby reducing the processing and manufacturing difficulty and optimizing the process.

As shown in fig. 1-3 and 8-11, a receiving groove 13 is provided in the base 1, and a pull-wire control mechanism is provided in the receiving groove 13, the pull-wire control mechanism includes a pull wire 12, a sliding control member 14, and a return torsion spring 15; an upper cover 16 for covering the accommodating groove 13 is further arranged at the upper end of the base 1, and the sliding control piece 14 is in sliding fit with the upper cover 16; specifically, the method comprises the following steps: a guide block 17 extending downwards is arranged at the bottom of the upper cover 16, and a sliding groove 18 arranged along the front-back direction is correspondingly arranged on the sliding control member 14; the guide block 17 is in sliding fit in the sliding groove 18, so that the sliding control part 14 can slide back and forth relative to the upper cover 16; from bottom to top, the guide block 17 is also connected with a limit screw which can limit the guide block 17 to be separated from the chute 18; the front end of the sliding control piece 14 is also provided with a connecting seat 19 which extends downwards, the wire drawing head of the wire drawing 12 is connected in the connecting seat 19, and then the sliding control piece 14 can be conveniently controlled to stably slide back and forth relative to the base 1 by drawing the wire drawing.

The reset torsion spring 15 is arranged between the sliding control part 14 and the inserting tongue 4, the reset torsion spring 3 is installed on the upper cover 16, the bottom of the upper cover 16 is further provided with an installation column extending downwards, the installation column is located behind the sliding control part 14, and the reset torsion spring 15 is installed on the installation column through a limiting screw. A fixing seat 20 extending downwards is further arranged on the upper cover 16, and the reset torsion spring 15 comprises a first torsion arm 15a and a second torsion arm 15 b; a first torsion arm 15a on the reset torsion spring 15 is abutted and limited in the fixed seat 10, so that the first torsion arm 15a is fixed relative to the base 1; the second torque arm 15b comprises an extension section 21 extending along the left-right direction and a connection section 22 extending backwards from the end of the extension section 21, and the extension section 21 and the connection section 22 are both made of linear spring steel, so that the strength is high and the resilience is good; the rear end of the connecting section 22 is connected to the tongue 4, as shown in fig. 10: the tongue 4 is provided with a through hole, and the rear end of the connecting section 22 is bent downwards and penetrates through the through hole. A clamping seat 23 extending downwards is further arranged at the rear end of the sliding control piece 14, the clamping seat 23 comprises two clamping plates spaced front and back, and the extension section 21 is just clamped in the clamping seat 23, so that the extension section 21 and the sliding control piece 14 keep synchronous movement in the front and back directions; then, the pull wire 12 is pulled to drive the sliding control piece 2 to slide forwards, so that the second torque arm 15b can be directly pulled to be bent and deformed forwards, and the second torque arm 15b drives the plug tongue 4 to exit from the socket 3; and the return torsion spring 15 is correspondingly elastically twisted to provide a return elastic force for the tongue 4 to be inserted into the socket 3 again. Furthermore, as shown in fig. 11, a bending section 24 is further provided between the extension section 21 and the connection section 22, and by means of the bending section 24, when the pulling wire 12 pulls the sliding control member 14 and the second torque arm 15b forward, the extension section 21 will bend forward to drive the connection section 22 to move forward, so that the bending section 24 between the extension section 21 and the connection section 22 will be elastically deformed, and then when the pulling wire 12 is released, the bending section 24 will also provide a restoring elastic force to accelerate the restoring speed of the connection section 22, so that the plug tongue 4 can be more quickly extended backward again to achieve quick locking. Therefore, the bending section 24 increases the elastic force between the extension section 21 and the connecting section 22, and can play a similar effect of a return spring, and the design is ingenious.

If 8, the inserting tongue 4 is slidably arranged between the upper cover 16 and the base 1, and the inserting tongue 4 is made of metal, so that the strength is higher; the tongue 4 is also provided with a guide groove 25 arranged along the front-back direction, and the upper cover 16 is correspondingly provided with a guide post 26 extending downwards into the guide groove 25; so that the inserting tongue 4 can stably slide back and forth relative to the upper cover 16. Then, the plug tongue 4 can be conveniently controlled to exit the socket 4 only by one pull wire 12 through the pull wire control mechanism; and the reset action of the inserting tongue 4 can be effectively realized under the action of the reset torsion spring 15. The design is ingenious, the whole body does not occupy space, and the device can be arranged in the base 1 with small space; the operation is very convenient.

As shown in fig. 6 and 7, then when the back frame 2 is in the sitting position, as shown in fig. 6, the inserting tongue 4 is inserted into the lower slot 6 to lock the back frame 2 and the base 1 in rotation; if the back support 2 can perform tilting movement, the pull wire 12 is pulled to enable the plug tongue 4 to exit from the lower slot 6, so that the operation is very convenient; as shown in fig. 7, when the back frame 2 rotates backward to the backward-leaning position, if the back frame 2 needs to be locked at the position, the pull wire 12 is only required to be loosened, and under the action of the return torsion spring 15, the tongue 4 will extend backward out of the base 1 again and be inserted into the upper slot 5, so that the back frame 2 and the base 1 can be locked rotationally again. Then the back support 3 can be conveniently locked at a sitting position or a backward-leaning position through the matching of the inserting tongue 4 and the socket 3; and the insertion tongue 4 can be easily adjusted by the pull wire control mechanism.

Claims (10)

1. A seat reclining locking device, characterized in that: the multifunctional chair comprises a base and a back support, wherein the front end of the back support is rotatably connected with the rear end of the base so that the back support can tilt and rotate relative to the base; an inserting mechanism used for locking the back support at a sitting position or a backward position is arranged between the base and the back support, and the inserting mechanism comprises a socket arranged on the back support and an inserting tongue correspondingly arranged on the base; a pull control mechanism for controlling the extension of the inserting tongue is arranged in the base; an upper slot and a lower slot which are spaced up and down are arranged in the socket; in the sitting position, the inserting tongue is inserted in the lower inserting groove; when the back support is in a backward-leaning position, the pull line control mechanism controls the plug tongue to exit from the lower slot, and the back support rotates backward and enables the plug tongue to be plugged into the upper slot.

2. The seat recline locking device of claim 1, wherein: the socket is detachably connected with the back support, a mounting groove is correspondingly formed in the back support, and the socket is embedded in the mounting groove.

3. The seat recline locking device of claim 2, wherein: a clamping block extending backwards is arranged at the rear end of the socket, and a clamping groove is formed in the corresponding position of the back support; the socket is embedded into the mounting groove so that the clamping block is clamped in the clamping groove; and the socket and the back support are fixedly connected by screws.

4. The seat recline locking device of claim 1, wherein: the pull wire control mechanism comprises a pull wire, a sliding control piece and a reset torsion spring; the pull wire is connected to the sliding control piece and acts on the sliding control piece to slide relative to the base; the reset torsion spring is arranged between the sliding control piece and the inserting tongue and comprises a first torsion arm and a second torsion arm, the first torsion arm is relatively fixed with the base, and the second torsion arm extends and is connected to the inserting tongue; the sliding control piece and the second torque arm form linkage fit, and the pull wire pulls the sliding control piece to slide forwards so as to simultaneously act on the second torque arm to bend forwards and deform and drive the plug tongue to exit the socket; the reset torsion spring correspondingly generates elastic torsion to provide reset elasticity for the plug tongue to be inserted into the socket again.

5. The seat recline locking device of claim 4 wherein: the second torque arm comprises an extension section, a connecting section and a bending section positioned between the extension section and the connecting section; the extension section is arranged along the horizontal direction, and the rear end of the sliding control piece is connected to the extension section; the connecting section extends backwards and is connected to the inserting tongue; when the second torque arm is deformed, the bending sections are simultaneously elastically deformed to provide restoring elasticity acting on the connecting section.

6. The seat recline locking device of claim 4 wherein: an accommodating groove is formed in the base, and the sliding control piece and the reset torsion spring are arranged in the accommodating groove; the base also comprises an upper cover used for covering the containing groove; the sliding control piece is provided with a sliding groove, and the bottom of the upper cover is provided with a guide block which extends downwards and is in sliding fit with the sliding groove; and the reset torsion spring is arranged on the upper cover.

7. The seat recline locking device of claim 6, wherein: the inserting tongue is arranged between the upper cover and the base in a sliding mode, a guide groove is formed in the inserting tongue in the front-back direction, and a guide pillar extending out of the guide groove is arranged on the upper cover or the base.

8. The seat recline locking device of claim 5, wherein: the rear end of the sliding control piece is provided with a clamping seat extending downwards, the extension section is clamped in the clamping seat, and the extension section and the sliding control piece keep synchronous motion in the front-back direction.

9. The seat recline locking device of claim 1 wherein: the rear end of the base is provided with a rotating part, and the front end of the back bracket is correspondingly provided with two rotating seats at intervals; the rotating part is positioned between the two rotating seats and is in rotating fit with the two rotating seats through a rotating shaft.

10. The seat recline locking device of claim 9, wherein: the rotating shaft horizontally penetrates through the rotating part, and two ends of the rotating shaft respectively penetrate through the rotating part; the inner side wall of the single rotating seat is correspondingly provided with a rotating groove, and the penetrating end of the rotating shaft is rotatably matched in the rotating groove.

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