CN113498945B - Chair and chair back adjusting mechanism thereof - Google Patents

Abstract

The utility model discloses a chair and an adjusting mechanism of a chair back thereof, which are arranged on a chair seat and comprise a chair back frame, a sliding piece and a fixed seat; the fixing seat comprises a plane part and an arc-shaped bending part which are fixedly connected or integrally formed, the plane part is positioned above the arc-shaped bending part, the chair back frame is positioned in front of the plane part, and the sliding part is arranged on the plane part in a manner of being capable of sliding up and down and is provided with a plurality of stay positions with different heights; the chair back frame is arranged on the sliding piece in a mode of being capable of sliding back and forth and has a plurality of different stay positions in the front-back direction; according to the technical scheme, the up-down adjusting structure of the chair back frame and the front-back adjusting structure are organically combined together, so that the number of parts is reduced, and the structure is simpler.

Description

Chair and chair back adjusting mechanism thereof

Technical Field

The utility model relates to the technical field of office furniture, in particular to a chair and an adjusting mechanism of a chair back of the chair.

Background

The body of the child is continuously grown, the too high and too low chairs have adverse effects on the body development of the child, the child has the problems of bending down, humpback, myopia and the like, the first one of the sitting postures is that two feet are needed to be correctly learned, and the thighs and the calves are at right angles or slightly smaller than 90 degrees. The feet are suspended or not put on the ground, the gravity center can be completely fallen on the thighs and buttocks, the blood vessel is pressed, the blood circulation is influenced, the children feel uncomfortable, the posture is inevitably changed, the correct sitting posture cannot be maintained, and the children are easy to fatigue and influence the concentration of spirit. The back rest of the chair is also important, and many households choose chairs that are not suitable for children to learn when selecting the chair. The depth of the chair back can not be adjusted, and children with the increased age and height can not lean on the chair back. The child may feel uncomfortable and thus rickets forward. The child can shake while sitting, and the lumbar spine of the child is also easily damaged.

The Chinese patent document with publication number of CN206079841U discloses a child study chair, which comprises a vertical rod, a chair back lifting sleeve pipe provided with a locking knob, a seat plate lifting sleeve pipe provided with the locking knob, a chair support base and five-star feet; the whole five-star foot is five-star; one end of the chair support base is fixedly connected with the bottom end of the upright rod, and the other end of the chair support base is fixedly connected with the center of the five-star foot; the chair back lifting sleeve and the chair plate lifting sleeve are sleeved on the upright rod from top to bottom and are locked through the locking knob. According to the utility model, the height of the chair back and the depth position of the chair plate can be correspondingly adjusted according to the increase of the growth age of the child, so that the height of the chair plate and the height of the chair back which are suitable for the physical health of the child are adjusted; the children can be forced to fix the sitting posture, and the children can be helped to change the bad sitting posture; the locking of the lifting sleeve of the seat board is firm, and the safety is high; the positions of the chair back and the chair plate can be adjusted according to the needs, so that the comfort is high; can be lifted or moved conveniently.

But during use one skilled in the art finds: the child learning chair respectively realizes the lifting of the chair back, the lifting of the chair seat and the front-back sliding of the chair seat through three adjusting mechanisms; the structure is complex, and there is room for further optimization.

Disclosure of Invention

In order to solve the problems, the utility model aims to overcome the defects of the prior art and provide an adjusting mechanism of a chair and a chair back thereof, which can adjust the chair back up and down and also can adjust the chair back front and back, and has simple structure.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

an adjusting mechanism of a chair back is characterized by comprising a chair back frame, a sliding piece and a fixed seat; the fixed seat is arranged on the chair seat, the chair back frame is positioned in front of the fixed seat, and the sliding piece is arranged on the fixed seat in a manner of being capable of sliding up and down and is provided with a plurality of stay positions with different heights; the seat back frame is slidably mounted to the slider and has a plurality of different resting positions in the front-rear direction.

Preferably, the chair back frame is also provided with a first lock tongue piece and a second lock tongue piece which are movably arranged on the sliding piece, the fixed seat is provided with a plurality of first gear parts in the up-down direction, and the chair back frame is provided with a plurality of second gear parts in the front-back direction;

in the up-and-down sliding process of the sliding piece, the first lock tongue piece can be respectively matched with a plurality of first gear parts, so that the sliding piece has a plurality of stay positions with different heights; and in the back and forth sliding process of the back frame, the second lock tongue piece can be respectively matched with a plurality of second gear parts, so that the back frame has a plurality of different stay positions in the front and back direction.

Preferably, the first tongue member is capable of forcing the second tongue member to move when the first tongue member moves; or,

the second latch member is capable of forcing the first latch member to move when the second latch member moves.

Preferably, the switch assembly is further provided with a first state and a second state, and the second spring bolt piece can move out of the second gear part simultaneously when the first spring bolt piece moves out of the first gear part in the process that the switch assembly enters the first state from the second state; thereby enabling the chair back frame to move back and forth and up and down;

and in the process that the switch assembly enters the second state from the first state, the first spring bolt piece can move into the second gear part at the same time when moving into the first gear part; thereby locking the slider to the fixed seat and the back frame to the slider.

Preferably, the switch assembly comprises a switch piece, a steel wire rope, a rubber sleeve and a return spring, wherein the switch piece is movably arranged on the back frame, the rubber sleeve is sleeved and arranged on the steel wire rope, the outer end of the rubber sleeve is fixed on the back frame, the inner end of the rubber sleeve is fixed on the sliding piece, the outer end of the steel wire rope extends out of the rubber sleeve and then is connected with the switch piece, the inner end of the steel wire rope extends out of the rubber sleeve and then is connected with the first spring bolt piece, and the return spring is arranged between the sliding piece and the first spring bolt piece and can force the first spring bolt piece to move forwards or has a forward moving trend;

the switch assembly can be in a second state or enter the second state from the first state under the action of the reset spring;

pulling the wire rope through the switch member can cause the switch assembly to enter the first state from the second state.

Preferably, the first bolt piece is provided with a first long hole, the sliding piece is provided with a second long hole, an inclined included angle is formed between the first long hole and the second long hole, and the second bolt piece is positioned in the first long hole and the second long hole.

Preferably, the chair back frame comprises an integrally formed arc-shaped frame and a sliding part, the left side wall and the right side wall of the sliding part extend in the left-right direction respectively to form first connecting arms, the outer ends of the two first connecting arms are connected with the left side and the right side of the arc-shaped frame respectively, the bottom wall of the sliding part extends downwards to form second connecting arms, the bottom ends of the second connecting arms are connected with the bottom ends of the arc-shaped frame, the sliding part and the sliding part are of hollow structures, a plurality of second gear positions are located on the sliding part, the sliding part is sleeved on the sliding part and can move back and forth on the sliding part, and the first spring bolt piece is located inside the sliding part and can move back and forth in the sliding part.

Preferably, the first bolt is provided with a first slot in the horizontal direction, the left and right side walls of the sliding piece are provided with second slots, an inclined included angle is formed between the first slot and the second slot,

the left part wall of the sliding part is concave to form a planar left bottom wall, the right part wall of the sliding part is concave to form a planar right bottom wall, and third long holes are distributed on the left bottom wall and the right bottom wall;

the sliding part is also provided with a left blocking block and a right blocking block, and the left blocking block and the right blocking block are respectively fixedly arranged on the left wall and the right wall of the sliding part so that the third long hole is a blind hole;

the middle part of the second bolt piece is positioned in the first long hole, the left and right half sections of the second bolt piece respectively pass through the left and right second long holes, and the left and right ends of the second bolt piece are respectively positioned in the two third long holes.

Preferably, the sliding part is provided with a third long hole, the third long hole comprises a first inner side wall and a second inner side wall which are distributed in parallel, the first inner side wall is provided with a plurality of first protruding parts which are distributed uniformly, the space between the top wall of each first protruding part and the second inner side wall can accommodate the front and back passing of the second spring bolt, and a groove formed by matching one or two first protruding parts with the inner side wall of the third long hole is the second gear part;

the second lock tongue piece moves from the first inner side wall to the second inner side wall to move out of the second gear part in the process that the switch assembly enters the first state from the second state, and can move back and forth in gaps between top walls of the first protruding parts and the second inner side wall in the back and forth movement process of the chair back frame;

during the process of the switch assembly entering the second state from the first state, the second lock tongue piece moves from the second inner side wall to the first inner side wall so as to move into the second gear part.

Preferably, the fixing seat is provided with two symmetrical sliding grooves, the upper end of each sliding groove is an open end, and the lower end of each sliding groove is a closed end; the rear end of the sliding piece extends to the left and right sides to form two sliding plates, and the two sliding plates are respectively matched with the two sliding grooves so that the sliding piece can be arranged on the fixed seat in an up-and-down sliding manner;

the first gear parts are blind holes or through holes and are positioned between the two sliding grooves; at least one third protruding part is arranged on the rear end face of the first spring bolt piece;

during the switch assembly moving from the second state to the first state, the first latch member moves rearward to move the third lobe out of the first gear position,

during the switch assembly from the first state to the second state, the first latch member moves forward to move the third boss into the first gear position.

A chair comprising an adjustment mechanism for a chair back as described above.

The beneficial effects of the utility model are as follows:

1) The switch component can control the front-back movement of the first spring bolt piece and the movement of the second spring bolt piece at the same time, so that the back frame can be controlled to move back and forth and move up and down at the same time, namely, the back frame can be adjusted in the up-down direction and the front-back direction at the same time;

2) The up-down adjusting structure and the front-back adjusting structure of the chair back frame are organically combined together, so that the number of parts is reduced, and the structure is simpler.

3) When the chair seat is arranged on the liftable chair legs, the chair back lifting adjustment, the chair seat lifting adjustment and the front-back adjustment of the chair back relative to the chair seat on the current study chair can be realized, and the chair seat is more in line with the main stream chair model in the current market and has more universality.

Drawings

FIG. 1 is a schematic view of a chair back adjusting mechanism according to the present utility model;

FIG. 2 is an exploded view of the adjustment mechanism of the chair back of the present utility model;

FIG. 3 is a schematic illustration of the first latch member, second latch member and slide assembly;

FIG. 4 is a second schematic illustration of the engagement of the first latch member, the second latch member and the slider;

FIG. 5 is a schematic view of the engagement of the first and second locking bolt members;

FIG. 6 is a schematic structural view of a fixing base according to the present utility model;

FIG. 7 is a schematic view of a back frame of the present utility model;

FIG. 8 is a second schematic view of the structure of the back frame of the present utility model;

fig. 9 is a partial enlarged view at a in fig. 8.

Reference numerals illustrate: 101. a chair back frame; 102. a slider; 103. a fixing seat; 1030. a planar portion; 1031. an arc-shaped bending part; 104. a first tongue member; 105. a second tongue member; 10300. a first gear portion; 1010. a second gear portion; 1040. a first long hole; 1020. a second long hole; 1011. a curved frame; 1012. a second connecting arm; 1013. a sliding part; 1014. a first connecting arm; 10130. a third long hole; 10131. a first boss; 1021. a first elastic arm; 1022. a second protruding portion; 10132. a third gear portion; 10133. a left bottom wall; 10134. a right bottom wall; 1015. a blocking piece; 10301. a sliding groove; 1023. a sliding plate; 1041. a third boss; 1024. a second elastic arm; 1025. a fourth protruding portion; 108. a rubber sleeve; 1026. a second mounting portion; 1042. a bolt seat.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the utility model, the direction of a person sitting on the chair is known, namely, in the application, the fixed seat is positioned at the rear of the back frame.

Embodiment one:

the adjusting mechanism of the chair back as shown in fig. 1 and 2 is installed on a chair seat and comprises a chair back frame 101, a sliding piece 102, a fixed seat 103 and a switch assembly, wherein the fixed seat 103 comprises a plane part 1030 and an arc-shaped bending part 1031 which are fixedly connected or integrally formed, the plane part 1030 is positioned above the arc-shaped bending part 1031, the chair back frame 101 is positioned in front of the plane part 1030, and the sliding piece 102 is installed on the plane part 1030 in a manner of being capable of sliding up and down and has a plurality of stay positions with different heights; the seat back frame 101 is slidably mounted on the slider 102 and has a plurality of different stay positions in the front-rear direction;

the switch assembly has a first state and a second state, and when the switch assembly is in the first state, the seat back frame 101 can move back and forth and up and down; when the switch assembly is in the second state, the slider 102 is locked to the planar portion 1030 and the seat back frame 101 is locked to the slider 102.

Thus, the up-down adjusting structure and the front-back adjusting structure of the chair back frame 101 are organically combined together, so that the number of parts is reduced, and the structure is simpler;

in addition, when the chair seat is arranged on the liftable chair legs, the chair back lifting adjustment, the chair seat lifting adjustment and the front-back adjustment of the chair back relative to the chair seat on the current study chair can be realized, and the chair seat is more in line with the main stream chair model in the current market and has more universality.

In the embodiment of the utility model, a first latch member 104 and a second latch member 105 movably mounted on the sliding member 102 are further provided, the planar portion 1030 is provided with a plurality of first gear portions 10300 arranged in the up-down direction, and the seat back frame 101 is provided with a plurality of second gear portions 1010 arranged in the front-back direction;

during the up-and-down sliding process of the sliding member 102, the first latch member 104 can respectively cooperate with the plurality of first gear parts 10300, so that the sliding member 102 has a plurality of stay positions with different heights; and during the back-and-forth sliding process of the back frame 101, the second latch member 105 can respectively cooperate with the second gear parts 1010 to enable the back frame 101 to have a plurality of different stay positions in the front-and-back direction;

the switch assembly can simultaneously control the first latch bolt piece 104 and the second latch bolt piece 105 to move, and when the first latch bolt piece 104 moves out of the first gear part 10300 in the process that the switch assembly enters the first state from the second state, the second latch bolt piece 105 can simultaneously move out of the second gear part 1010; and during the switch assembly going from the first state to the second state, the first latch member 104 is able to move into the second gear portion 1010 simultaneously with the second latch member 105 as it moves into the first gear portion 10300.

Further preferably, the switch assembly is configured to control movement of the first latch member 104 out of and into the first gear portion 10300, and the first latch member 104 is configured to force the second latch member 105 out of the second gear portion 1010 during movement of the first latch member 104 out of the first gear portion 10300, and the first latch member 104 is configured to force the second latch member 105 into the second gear portion 1010 during movement of the first latch member 104 into the first gear portion 10300.

Of course, in other embodiments, the switch assembly may also be used to control the movement of the second latch member 105 out of the second gear portion 1010, and the second latch member 105 may be capable of forcing the first latch member 104 out of the first gear portion 10300 during movement of the second latch member 105 out of the second gear portion 1010, and the second latch member 105 may be capable of forcing the first latch member 104 into the first gear portion 10300 during movement of the second latch member 105 into the second gear portion 1010.

Thus, the first latch member 104 can be controlled to move back and forth and the second latch member 105 can be controlled to move up and down simultaneously by one switch assembly, and the back frame 101 can be controlled to move back and forth and move up and down simultaneously, i.e. the back frame 101 can be adjusted up and down and in the back and forth direction simultaneously.

As shown in fig. 1, 2, 7 and 8, the seat back frame 101 includes an integrally formed arc-shaped frame 1011 and a sliding part 1013, the left and right side walls of the sliding part 1013 extend in the left and right directions to form a first connecting arm 1014, the outer ends of the two first connecting arms 1014 are respectively connected with the left and right sides of the arc-shaped frame 1011, the bottom wall of the sliding part 1013 extends downward to form a second connecting arm 1012, the bottom end of the second connecting arm 1012 is connected with the bottom end of the arc-shaped frame 1011, the sliding part 1013 and the sliding part 102 are hollow structures, the plurality of second gear parts 1010 are located on the sliding part 1013, the sliding part 1013 is sleeved on the sliding part 102 and can move back and forth on the sliding part 102, and the first latch member 104 is located inside the sliding part 102 and can move back and forth inside the sliding part 102.

As shown in fig. 3-5, the first latch member 104 is provided with a first long hole 1040, the slider 102 is provided with a second long hole 1020, an inclined angle is formed between the first long hole 1040 and the second long hole 1020, and the second latch member 105 is located in the first long hole 1040 and the second long hole 1020. Thus, the movement of the first latch member 104 in the front-rear direction can drive the second latch member 105 to move on the sliding member 102, and of course, the movement of the second latch member 105 on the sliding member 102 can also drive the first latch member 104 to move in the front-rear direction.

The first long hole 1040 and the second long hole 1020 may be long holes in the horizontal direction or long holes in the vertical direction, and the second latch member 105 may have a cylindrical structure in order to better fit between the first long hole 1040 and the second long hole 1020.

In order to make the driving between the first latch member 104 and the second latch member 105 smoother and more suitable, the inclined angle formed between the first long hole 1040 and the second long hole 1020 is in the range of 30 ° -60 °, preferably 45 °.

In this embodiment, as shown in fig. 9, the sliding portion 1013 is provided with a third long hole 10130, the third long hole 10130 includes a first inner sidewall and a second inner sidewall that are distributed in parallel, the first inner sidewall is provided with a plurality of first protrusions 10131 that are distributed uniformly, a space between a top wall of the first protrusions 10131 and the second inner sidewall can accommodate the second latch member 105 to pass back and forth, and a groove formed by matching one or two of the first protrusions 10131 with the inner sidewall of the third long hole 10130 is the second gear portion 1010. Thus, the second latch member 105 being in the locked position means that the second latch member 105 is located in the second gear position, and the seat back frame 101 cannot slide back and forth on the sliding member 102 due to the blocking of the first boss 10131 and the inner sidewall of the third slot 10130; when the switch assembly drives the first latch member 104 to move backward, the first latch member 104 can force the second latch member 105 to move toward the second inner sidewall and separate from the first protrusion 10131, so that the second latch member 105 can move forward and backward in the gap between the top of the first protrusion 10131 and the second inner sidewall, and the back frame 101 can then move forward and backward freely on the sliding member 102.

Further preferably, the top wall of the first boss 10131 smoothly transitions with the front side wall of the first boss 10131, and the top wall of the first boss 10131 smoothly transitions with the rear side wall of the first boss 10131.

Specifically, the first bolt 104 is provided with a first long hole 1040 in the horizontal direction, an included angle between the first long hole 1040 and the vertical plane is about degrees, the left and right side walls of the sliding member 102 are provided with second long holes 1020, and the second long holes 1020 are substantially vertical;

the left wall of the sliding part 1013 is concave to form a planar left bottom wall 10133, the right wall of the sliding part 1013 is concave to form a planar right bottom wall 10134, and the left bottom wall 10133 and the right bottom wall 10134 are respectively distributed with a third long hole 10130;

the left and right blocking blocks 1015 are further provided, and the left and right blocking blocks 1015 are fixedly installed on the left wall and the right wall of the sliding part 1013 through a fastening structure respectively so that the third long hole 10130 is a blind hole; and filling up the left and right walls of the sliding part 1013;

the second bolt 105 is located in the first long hole 1040, the two second long holes 1020 and the two third long holes 10130; and, both ends of the second latch member 105 are positioned in the left and right third elongated holes 10130.

In this way, the second tongue member 105 is horizontal, and it is easier to avoid the second tongue member 105 falling off than if the second tongue member 105 is vertical; meanwhile, the blocking blocks 1015 are fixedly arranged on the outer sides of the two third long holes 10130, so that the second lock tongue piece 105 is convenient to install, and the second lock tongue piece 105 is prevented from falling out from one side.

Here, it is worth mentioning that the front side wall and the rear side wall of the third elongated hole 10130 can be used to limit the range of the back-and-forth movement of the seatback frame 101.

In this embodiment, as shown in fig. 3 and fig. 4, the sliding member 102 is further provided with a first elastic arm 1021, the first elastic arm 1021 is located on the lower wall of the sliding member 102, and the movable end of the first elastic arm 1021 is provided with a second protruding portion 1022 protruding downward;

a plurality of third gear parts 10132 are arranged on the lower wall of the sliding part 1013 in the front-back direction, the third gear parts 10132 are in one-to-one correspondence with the second gear parts 1010, and the second protruding parts 1022 on the first elastic arms 1021 can respectively move into the plurality of third gear parts 10132 during the front-back sliding of the chair back frame 101; and when the second boss 1022 moves into the third gear 10132, the movement of the second latch member 105 in the second long hole 1020 is not blocked by the first boss 10131.

The third gear 10132 may be a through hole or a blind hole, or may be a groove similar to the second gear 1010.

So arranged, when the first latch member 104 and the second latch member 105 are both located at the locking position, the second protrusion 1022 on the first elastic arm 1021 cooperates with the third gear 10132 to assist the cooperation between the second latch member 105 and the second gear 1010 to lock the back frame 101 on the sliding member 102; and when the first bolt member 104 and the second bolt member 105 are not located at the locking position, the second protruding portion 1022 on the first elastic arm 1021 and the third gear portion 10132 are matched, so that the seat back frame 101 can be adjusted in a front-back adjusting process, and in addition, each gear can be adjusted in a gear sense, and finally, an occupant can conveniently position the seat back frame 101 by sliding back and forth on the sliding member 102, and the second bolt member 105 is prevented from being blocked by the first protruding portion 10131 in the moving process towards the locking position.

In this embodiment, as shown in fig. 6, two symmetrical sliding grooves 10301 are disposed on the fixed base 103, the upper end of the sliding groove 10301 is an open end, and the lower end of the sliding groove 10301 is a closed end;

the rear end of the sliding member 102 extends to the left and right sides to form two sliding plates 1023, and the two sliding plates 1023 are respectively matched with the two sliding grooves 10301, so that the sliding member 102 is mounted on the fixed seat 103 in a manner of being capable of sliding up and down.

Thus, the upper end of the sliding groove 10301 is an open end, which is convenient for installing and detaching the sliding piece 102; the lower end of the sliding groove 10301 is a closed end, and the sliding member 102 can be prevented from falling down.

The first gear portion 10300 may be a through hole or a blind hole, or may be a groove similar to the second gear portion 1010. In this embodiment, the first gear portion 10300 is a through hole, and the plurality of first gear portions 10300 are located between two sliding grooves 10301; at least one third protruding portion 1041 is disposed on the rear end surface of the first latch member 104, and when the first latch member 104 is located at the locking position, the third protruding portion 1041 is located in the first gear portion 10300, that is, the through hole, and can abut against the upper inner sidewall and the lower inner sidewall of the through hole; thereby achieving the purpose of restricting the up-and-down movement of the slider 102 and the back frame 101.

In this embodiment, as shown in fig. 3 and 4, the sliding member 102 is further provided with a second elastic arm 1024, the second elastic arm 1024 is located at a rear end surface of the sliding member 102, a movable end of the second elastic arm 1024 is provided with a fourth protruding portion 1025 protruding backward, and in the up-and-down movement process of the sliding member 102, the fourth protruding portion 1025 can be respectively matched with the plurality of first gear portions 10300 on the fixed seat 103.

So configured, when first tongue member 104 and second tongue member 105 are both in the locked position, the engagement of fourth projection 1025 on second resilient arm 1024 with first gear portion 10300 can assist the engagement between first tongue member 104 and first gear portion 10300 to lock and mount slider 102 on fixed base 103; and when first spring bolt spare 104 and second spring bolt spare 105 are all not in the locked position, the cooperation of fourth bellying 1025 and first gear portion 10300 on the second elastic arm 1024 can make slider 102 adjust in-process about, can all have the gear sense in the in-process of adjusting for every shelves, and finally can make things convenient for the passenger to slide from top to bottom on fixing base 103 to slide slider 102 and fix a position, avoid first spring bolt spare 104 can not be accurate in the in-process of moving to the locked position and first gear portion 10300 cooperation and block.

As shown in fig. 1 and 2, the switch assembly is mounted on the back frame 101 so that an occupant can sit on the chair to gain access to the switch assembly, thereby enabling the position of the back frame 101 to be adjusted according to his/her own real-time experience.

The switch assembly pulls either the first latch member 104 or the second latch member 105 to move out of the locked position. This is because the switch assembly is mounted on the back frame 101, and the distance between the switch assembly and the first latch member 104 and the second latch member 105 increases during the forward movement of the back frame 101, and if the first latch member 104 or the second latch member 105 is controlled by the cable alone, the first latch member 104 and the second latch member 105 cannot return to the locking position; therefore, this phenomenon is avoided by providing a brake cable-like structure in the present embodiment; specifically, the switch assembly comprises a switch member (not shown), a steel wire rope (not shown), a rubber sleeve 108 and a return spring (not shown), wherein the switch member is movably arranged on the back frame 101, the rubber sleeve 108 is sleeved on the steel wire rope, the outer end of the rubber sleeve 108 is fixed on the back frame 101, the inner end of the rubber sleeve 108 is fixed on the sliding member 102, the outer end of the steel wire rope extends out of the rubber sleeve 108 and then is connected with the switch member, the inner end of the steel wire rope extends out of the rubber sleeve 108 and then is connected with the first lock tongue member 104, and the return spring is arranged between the sliding member 102 and the first lock tongue member 104 and can force the first lock tongue member 104 to move forwards or has a forward moving trend;

wherein the rubber sleeve 108 is in an unstrained state when the back frame 101 is positioned at the foremost end.

In this way, the difference between the back and forth movement of the back frame 101 and the first tongue piece 104 is compensated for by the extension and closure of the rubber sleeve 108, i.e., the rubber sleeve 108 and the wire rope do not have a force transmission effect in the process; meanwhile, the inner hole of the rubber sleeve 108 is actually a track used as a steel wire rope to move, and the switch piece drives the steel wire rope to move, so that the steel wire rope can only move along the inner hole of the rubber sleeve 108, and further can have a force transmission function, and the first lock tongue piece 104 is pulled to move forwards.

It should be noted that, the "fixing" of the outer end of the rubber sleeve 108 to the seat back frame 101 and the inner end of the rubber sleeve 108 to the sliding member 102 includes both a virtually fixed connection formed by embedding, clamping or other means, and a fixed means formed by the tension of the rubber tube itself so that the outer end of the rubber tube always abuts against the seat back frame 101 and the inner end of the rubber tube always abuts against the sliding member 102; specifically, a second installation part 1026 is provided in the sliding member 102, a first channel for allowing the steel wire rope to pass and blocking the rubber tube to pass is provided on the second installation part 1026, and the inner end of the rubber tube is always propped against the second installation part 1026; a third installation part is arranged on the arc-shaped frame 1011 of the chair back frame 101, and a second channel which can be used for passing the steel wire rope and blocking the rubber tube is arranged on the third installation part; the outer end of the rubber tube is always propped against the third installation part.

Wherein; the first channel and the second channel can be grooves or through holes with gaps.

As shown in fig. 5, a latch seat 1042 is disposed on the lower wall of the first latch member 104, the inner end of the wire rope is fixedly mounted on the latch seat 1042, and the return spring is disposed between the latch seat 1042 and the second mounting portion 1026.

In the embodiment of the present utility model, the specific adjustment process for the back frame 101 is as follows:

the switch assembly is in a second state under the action of the return spring, at this time, the third protrusion 1041 is located in the first gear portion 10300, and the second latch member 105 is located in the second gear portion 1010, that is, is close to the first inner side wall; i.e. the slider 102 is locked to the planar portion 1030 and the back frame 101 is locked to the slider 102.

The switch member is turned or pulled to move the wire rope along the rubber sleeve 108 to pull the first latch member 104 to move backward, so that the third protrusion 1041 moves out of the first gear 10300, and meanwhile, the second latch member 105 is forced to move from the first inner sidewall to the second inner sidewall to move out of the second gear 1010, that is, the switch member is turned or pulled to make the switch assembly enter the first state from the second state, and when the switch assembly enters the second state, the seat back frame 101 can move back and forth and move up and down, and during the back and forth movement of the seat back frame 101, the second latch member 105 can move back and forth in the gap between the top walls of the first protrusions 10131 and the second inner sidewall.

The switch member is released, and the switch assembly is moved from the first state to the second state by the return spring, at this time, the first latch member 104 moves forward, and the third protrusion 1041 moves into the first gear portion 10300, and at the same time, the second latch member 105 is forced to move from the second inner sidewall to the first inner sidewall to move into the second gear portion 1010.

The chair comprises chair legs, supporting rods, a chair seat and the adjusting mechanism of the chair back, wherein the adjusting mechanism of the chair back is arranged on the chair seat, the chair seat is arranged on the chair legs through the supporting rods, and the supporting rods can be lifted.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (7)

1. An adjusting mechanism of a chair back is characterized by comprising a chair back frame (101), a sliding piece (102) and a fixed seat (103); the fixed seat (103) is arranged on the seat, the chair back frame (101) is positioned in front of the fixed seat (103), and the sliding piece (102) is arranged on the fixed seat (103) in a manner of being capable of sliding up and down and is provided with a plurality of stay positions with different heights; the chair back frame (101) is arranged on the sliding piece (102) in a manner of being capable of sliding back and forth and has a plurality of different stay positions in the front-back direction;

the chair is characterized by further comprising a first lock tongue piece (104) and a second lock tongue piece (105) which are movably arranged on the sliding piece (102), wherein a plurality of first gear parts (10300) are arranged on the fixed seat (103) in the up-down direction, and a plurality of second gear parts (1010) are arranged on the chair back frame (101) in the front-back direction;

during the up-and-down sliding process of the sliding piece (102), the first lock tongue piece (104) can be respectively matched with a plurality of first gear parts (10300) so that the sliding piece (102) has a plurality of stay positions with different heights; and in the process of sliding the chair back frame (101) forwards and backwards, the second lock tongue piece (105) can be respectively matched with a plurality of second gear parts (1010) so that the chair back frame (101) has a plurality of different stay positions in the front-back direction;

wherein, when the first bolt member (104) moves, the first bolt member (104) can force the second bolt member (105) to move; or,

-said second tongue member (105) being able to force the first tongue member (104) to move when said second tongue member (105) is moved;

the switch assembly is further provided with a first state and a second state, and when the switch assembly enters the first state from the second state, the first lock tongue piece (104) moves out of the first gear part (10300), and the second lock tongue piece (105) can simultaneously move out of the second gear part (1010); thereby enabling the back frame (101) to move back and forth and up and down;

and during the switch assembly moving from the first state to the second state, the first latch member (104) is capable of moving into the second gear portion (1010) simultaneously with the second latch member (105) when moving into the first gear portion (10300); thereby locking the sliding piece (102) on the fixed seat (103) and the chair back frame (101) on the sliding piece (102);

the switch assembly comprises a switch piece, a steel wire rope, a rubber sleeve (108) and a return spring, wherein the switch piece is movably arranged on a chair back frame (101), the rubber sleeve (108) is sleeved and arranged on the steel wire rope, the outer end of the rubber sleeve (108) is fixed on the chair back frame (101), the inner end of the rubber sleeve (108) is fixed on a sliding piece (102), the outer end of the steel wire rope extends out of the rubber sleeve (108) and then is connected with the switch piece, the inner end of the steel wire rope extends out of the rubber sleeve (108) and then is connected with a first spring bolt piece (104), and the return spring is arranged between the sliding piece (102) and the first spring bolt piece (104) and can force the first spring bolt piece (104) to move forwards or has a trend of moving forwards;

the switch assembly can be in a second state or enter the second state from the first state under the action of the reset spring;

pulling the wire rope through the switch member can cause the switch assembly to enter the first state from the second state.

2. The chair back adjusting mechanism according to claim 1, wherein the first latch member (104) is provided with a first long hole (1040), the sliding member (102) is provided with a second long hole (1020), an inclined included angle is formed between the first long hole (1040) and the second long hole (1020), and the second latch member (105) is located in the first long hole (1040) and the second long hole (1020).

3. The chair back adjusting mechanism according to claim 1, wherein the chair back frame (101) comprises an integrally formed arc-shaped frame (1011) and a sliding part (1013), the left and right side walls of the sliding part (1013) respectively extend in the left and right directions to form first connecting arms (1014), the outer ends of the two first connecting arms (1014) are respectively connected with the left and right sides of the arc-shaped frame (1011), the bottom wall of the sliding part (1013) extends downwards to form a second connecting arm (1012), the bottom end of the second connecting arm (1012) is connected with the bottom end of the arc-shaped frame (1011), the sliding part (1013) and the sliding part (102) are both hollow structures, the second gear parts (1010) are located on the sliding part (1013), the sliding part (1013) is sleeved on the sliding part (102) and can move back and forth on the sliding part (102), and the first lock tongue part (104) is located inside the sliding part (102) and can move back and forth inside the sliding part (102).

4. The chair back adjusting mechanism according to claim 3, wherein the first latch member (104) is provided with a first elongated hole (1040) in the horizontal direction, the left and right side walls of the sliding member (102) are provided with second elongated holes (1020), an inclined angle is formed between the first elongated hole (1040) and the second elongated hole (1020),

the left part wall of the sliding part (1013) is concave to form a plane left bottom wall (10133), the right part wall of the sliding part (1013) is concave to form a plane right bottom wall (10134), and third long holes (10130) are distributed on the left bottom wall (10133) and the right bottom wall (10134);

the sliding part (1013) is also provided with a left blocking piece (1015), and the left blocking piece (1015) and the right blocking piece (1015) are respectively fixedly arranged on the left part wall and the right part wall of the sliding part (1013) so that the third long hole (10130) is a blind hole;

the middle part of the second spring bolt piece (105) is positioned in the first long hole (1040), the left and right half sections of the second spring bolt piece (105) respectively pass through the left and right second long holes (1020), and the left and right ends of the second spring bolt piece (105) are respectively positioned in the two third long holes (10130).

5. The adjusting mechanism of the chair back according to claim 3, wherein the sliding part (1013) is provided with a third long hole (10130), the third long hole (10130) comprises a first inner side wall and a second inner side wall which are distributed in parallel, the first inner side wall is provided with a plurality of first protruding parts (10131) which are distributed uniformly, the space between the top wall of the first protruding parts (10131) and the second inner side wall can accommodate the front and back passing of the second lock tongue piece (105), and the groove formed by the cooperation of one or two first protruding parts (10131) and the inner side wall of the third long hole (10130) is the second gear part (1010);

the second lock tongue piece (105) moves from the first inner side wall to the second inner side wall to move out of the second gear position part (1010) in the process of the switch assembly entering the first state from the second state, and the second lock tongue piece (105) can move back and forth in a gap between the top walls of the first protruding parts (10131) and the second inner side wall in the process of the back and forth movement of the back frame (101);

during the switch assembly moving from the first state to the second state, the second latch member (105) moves from the second inner side wall to the first inner side wall to move into the second gear portion (1010).

6. The adjusting mechanism of a chair back according to claim 1, wherein the fixing base (103) is provided with two symmetrical sliding grooves (10301) on the left and right, the upper end of the sliding groove (10301) is an open end, and the lower end of the sliding groove (10301) is a closed end; the rear end of the sliding piece (102) extends to the left and the right to form two sliding plates (1023), and the two sliding plates (1023) are respectively matched with the two sliding grooves (10301) so that the sliding piece (102) can be arranged on the fixed seat (103) in an up-and-down sliding manner;

the first gear parts (10300) are blind holes or through holes and are positioned between the two sliding grooves (10301); at least one third protruding part (1041) is arranged on the rear end surface of the first lock tongue piece (104);

during the switch assembly going from the second state to the first state, the first tongue member (104) moves rearward to move the third protrusion (1041) out of the first gear position (10300),

during the switch assembly from the first state to the second state, the first tongue member (104) moves forward to move the third protrusion (1041) into the first gear position (10300).

7. A chair comprising an adjustment mechanism for a chair back according to any one of claims 1 to 6.