KR102491240B1 - A chair with tilt function - Google Patents

Abstract

The present invention relates to a chair with a tilt function. In a typical swivel chair, a fixed body using a connection bar is connected to a connection part which connects support legs to a seat plate part of the chair, a lower side connection assembly of a backrest frame forming a backrest part is connected to the fixed body to be tilted in a right-and-left direction, and a tilt control part provided on an upper side of the fixed body controls the tilt of the connection assembly part of the backrest frame side, thereby ensuring only the rear side tilt. Alternatively, the chair may provide various tilting movements in right and left sections and a rear section, such as a rear tilt, right and left tilts, thereby, even when sitting in the chair and leaning against the backrest seat, enabling a user to take comfortable movement actions such as an action of tilting the body from side to side and an action of tilting the body rearward without straining the body, and alleviating fatigue in the lumbar region.

Description

A chair with tilt function {A chair with tilt function}

The present invention relates to a chair having a tilt function, and more particularly, to a chair capable of tilting a backrest part backward, wherein the seat plate is rotated while supporting a support leg on the bottom of the seat plate, and the height of the seat plate and the rear tilt of the backrest Comfortable movement that does not put strain on the body by selectively adjusting the left and right tilt motion including the rearward tilt motion of the backrest part even when seated on a chair by connecting the backrest frame to the backrest part so that the backrest frame can be tilted in the left and right directions at the connection part where each adjustment is made. It relates to a chair having a tilt function that enables realization of motion.

In general, chairs are widely used for home or office purposes, and their shape is composed of a seat, a back (backrest) coupled to the seat, and a leg coupled to the lower side of the seat, and is coupled to the seat or back to provide comfort to the user. It may further include an armrest for supporting an arm and a headrest coupled to an upper side of the backrest to support a user's head.

In addition, the legs are branched in multiple directions, and casters are provided on each end side of the branch to facilitate movement from the floor. It is manufactured so that it can be rotated to the left or right in a chair sitting position in the left or right direction based on an axis, and a lever for adjusting the height of the seat plate from the leg or rearward tilt is provided at the connection part.

In the rearward tilt of a chair, the frame side of the backrest connected to the seat plate adjusts the degree of elasticity of the spring, so when a user sits on the seat and leans his back against the seat back, the backrest moves from the seat plate as much as the force applied at this time. It is used in a state where the user can rest by leaning back in a comfortable posture through an elastic tilt motion, and when the user raises the back, the backrest returns to its initial state and naturally supports the lumbar region to maintain a correct sitting posture.

In general, as described above, in a chair that is elastically tilted by leaning on the backrest in the rear direction, looking at a sailor's technology for the left and right tilt operation of the backrest, Korean Patent No. 10-2078745 (name: left and right tilt module for backrest, Hereinafter referred to as 'patent literature') is disclosed.

The above patent document is fastened to the seat plate connecting member in a state accommodated in the backrest mounting groove, and has a structure in which side plates are vertically extended at four edges of the bottom plate, respectively, and a base body having an internal space with an open upper side; a support shaft disposed long side by side in the front-rear direction of the backrest on the upper side of the base body and having both sides fitted into the base coupling holes of the base body; a movable body fastened to an upper inner wall of the backrest mounting groove in a state in which movable coupling holes are fitted into the support shaft so as to tilt left and right from the upper side of the base body; An elastic block disposed between the base body and the movable body to support the movable body with an elastic force so as to return the movable body to a horizontal posture, wrapped around the support shaft from the upper side, and disposed left and right with the support shaft interposed therebetween an elastic mechanism having a pair of springs for supporting the movable body with an elastic force; Position holding brackets disposed on the upper surface of the base body to maintain the respective positions of the elastic blocks and springs; Support blocks supporting the upper ends of the springs while being fixed to the movable body, respectively; and bushes mounted on fitting parts of the movable body and the support shaft to support the left and right tilting operation of the movable body.

As a configuration of elastic mechanisms disposed between the body and the movable body and supporting the movable body with elastic force to return the movable body to a horizontal posture, the left and right tilt operation of the backrest can be implemented. In the connected state, since the direction of inclination based on the support shaft for the inclination of the backrest is biased on one of the two springs provided overall, the force repeatedly applied to the springs on both sides where the support shaft is located is large. Since the resistance to the tilt operation is high by acting on it, there is a disadvantage in that the damage rate of the surrounding members supporting it is high.

In other words, since the left and right tilt motion of the chair is a structure that cannot be fixed in the left and right directions like a general chair, the chair in the patent literature to which the left and right tilt function is applied induces a twisted posture where the center of the user's back is not centered with respect to the backrest Because it is easy to do, it has a disadvantage that it does not help correct posture.

Korean Patent Registration No. 10-2078745 (registered on February 12, 2020)

The present invention was invented to solve the conventional problems as described above, and in a chair capable of tilting the backrest part backward, the seat plate is rotated while supporting the support leg on the bottom of the seat plate, and the height of the seat plate and the backrest It is connected to the backrest so that the backrest frame can be tilted in the left and right directions at the connection part where the rearward tilt adjustment is made, and the left and right tilt motion including the rearward tilt motion of the backrest is selectively adjusted even when seated on the chair, so that the body is not burdened. An object of the present invention is to provide a chair having a backrest tilt function so that comfortable movement and operation can be implemented.

A chair having a tilt function according to the present invention for achieving the above object is

A backrest portion to which a backrest seat is attached to the front of the backrest frame, a seat portion provided with a seating seat on the upper portion and connected to the backrest portion, a connection portion provided at the bottom of the seat portion for adjusting the height of the seat portion and supporting rotation of the seat portion, and a lower portion of the connection portion In the chair having a tilt function composed of a supporting leg connected to,

A hinge part is provided on one side of the connection part, and the connecting rod is rotatably connected to the hinge part with a shaft pin, and a fixing box for inserting and fixing one side of the connecting rod and connecting to the backrest frame is coupled to one side of the connecting part, and the backrest frame On one side of the lower part of the seat plate, a connection assembly unit for tilting the backrest in the left and right directions by leaning on the backrest is provided, and is connected and assembled to the fixing box. It is characterized by being assembled and installed.

According to the present invention, the connection assembly part of the backrest frame is provided in parallel with connection shafts forward from both sides of the lower portion and is connected to both sides of the fixing box by a fixing screw shaft to be rotated, and one side of the connection shaft is connected to the left and right tilt operation of the backrest An insertion protrusion that is guided to the inside of the fixed enclosure or restricted from entering the fixed enclosure by the tilt control unit is provided, and on the side of the connecting shaft portion, a coil spring is penetrated from the side of the fixed enclosure to provide elasticity to both sides. to be

The fixing box according to the present invention has fixing holes formed on both sides of the upper part of the rectangular body, has an insertion hole for inserting and fixing the connecting rod on the front side, and a rectangular depression for installing the tilt control unit on one side of the upper part of the main body It is provided, but vertical holes are formed at intervals in the depression, transverse holes are formed between the longitudinal holes, insertion holes communicating with the inside of the insertion hole are formed on both sides of the inner length of the depression, and both sides of the main body are formed with the connection assembly. It is characterized in that the hinge shaft portion and the guide groove step are integrally formed, and a spring fixing groove is formed, respectively, and a through hole is formed on one side where the spring fixing groove is formed.

In the tilt control unit according to the present invention, a guide protrusion is formed at the bottom so that the guide can move back and forth in the longitudinal hole of the recessed part, a tilt adjustment hole is formed between the guide protrusions, and an insertion hole of the fixing box is formed on both sides of the length side. A fixed key having a support piece guided therein to control entry of the insertion protrusion, seated on the upper part of the recess and fixed with a fastening screw, a cover plate having a long hole formed on one side of the upper part and having a guide member on one side of the long hole, and one side An operating shaft is provided at the bottom and is slide-adjusted through the long hole of the cover plate to adjust the position of the inclination adjustment hole of the fixed key to move the fixed key back and forth, and one side is provided with a guide piece guided by the guide member integrally It is characterized in that it consists of an operating lever.

In the chair having a tilt function according to the present invention, a fixing box using a connecting rod is connected to a connecting part connecting a supporting leg to the seat of the chair, and to the fixing box, the left and right connecting parts of the lower side of the backrest frame constituting the backrest are connected to the fixing box. It is connected to be tilted in the direction, and by controlling the tilt of the backrest frame side connection assembly part through the tilt control unit provided on the upper side of the fixed enclosure, a general rotary chair with only rear tilt, or left and right tilt and left and right and rear along with rear tilt In the section between the sides, various tilts are performed, so that even when sitting on a chair and leaning on the back seat, the motion of leaning to the left and right and the motion of leaning to the rear and sideways are comfortable movements that do not strain the body, as well as lower back fatigue. It has the effect of providing an exercise that can release it.

1 is a rear perspective view showing a chair having a tilt function according to the present invention;
2 is a bottom perspective view of a chair showing a connection between a backrest and a seat according to the present invention;
Figure 3 is a perspective view showing an excerpt of a fixing box connected to the bottom of the seat plate and the connection assembly provided on the lower side of the backrest according to the present invention;
Figure 4 is an exploded perspective view showing the installation state of the tilt control unit installed in the fixed enclosure according to the present invention;
5 (a) and (b) are rear views showing the left and right tilting operation of the backrest of the chair according to the present invention;
6 (a) and (b) are plan views illustrating the operation state of the fixed key on the tilt controller side in FIG. 5;
7 (a), (b), and (c) are enlarged plane views showing the tilt operation of the backrest frame in FIG. 6;
8 is a side view showing a rearward tilt operation of the backrest according to the present invention;
9 is a plan view illustrating a tilt operation direction of the backrest unit according to the present invention.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

Prior to this, the terms or words used in this specification and claims should not be construed as being limited to the usual or dictionary meaning, and the inventor appropriately uses the concept of the term in order to explain his/her invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are only one of the most preferred embodiments of the present invention, and do not represent all the technical ideas of the present invention, so at the time of this application, they can be replaced. It should be understood that there may be many equivalents and variations.

A chair having a tilt function according to the present invention will be described with reference to the accompanying FIGS. 1 to 9.

A backrest portion 1 to which a backrest seat 1b is attached to the front of the backrest frame 1a, a seat portion 2 provided with a seating seat 2a on the upper portion and connected to the backrest portion, and a seat plate provided at the bottom of the seat portion In the chair 100 having a tilt function composed of a connection part 3 for adjusting the height of part (2) and rotationally supporting the seat plate, and a support leg 4 connected to the lower part of the connection part 3,

A hinge part 3a is provided on one side of the connection part 3 fixed to the bottom of the seat plate part 2, and the hinge part 3a is rotatably connected to the connection table 5 with a shaft pin P.

The connecting rod 5 is a component for connecting the fixing box 20 to be described later, and as shown in the attached FIG. 4, it is inserted into the front of the fixing box 20 and at the back It is fixedly installed with fastening screw (B). A fastening hole 5a is formed at the rear of the connecting rod 5 to fix the fastening screw B.

That is, as described above, the connecting rod 5 is connected to the fixing box 20 through the connecting part 3, the fixing box 20 is connected to the back frame 1a, and the opposite side connected to the fixing box is It is installed in the connection part and is installed to be elastically adjusted through the control lever connected to be exposed to the outside of the connection part.

A connection assembly part 10 is provided on one lower side of the backrest frame 1a to tilt the backrest part 1 in the left and right direction by leaning against the backrest part 1 based on the seat plate part 2, ) is assembled to connect to.

Looking at the connection assembly part 10 of the backrest part 1, as shown in the attached FIG. 3, the connection shaft parts 11 facing each other forward from both sides of the lower part of the backrest frame 1a are provided in parallel. It is connected to the fixing screw shaft (S) to be rotated on both sides of the fixing box (20).

On one side of the connecting shaft part 11, insertion into the inside of the fixing box 20 according to the left and right tilting operation of the backrest part 1 or entering the inside of the fixing box 20 by the tilt control unit 30 described later A protrusion 12 is provided, and a coil spring 13 is penetrated from the side of the fixing box 20 on the side of the connecting shaft 11 and installed so that elasticity is imparted to both sides. On the outer side where the coil spring 31 is interposed, a spring insertion hole 14 and fastening grooves are formed on both sides of the spring insertion hole, and a separate cover is detachably provided on the outside where the spring insertion hole is formed to be detachable by a fastening screw. To prevent the coil spring 13 from coming off.

The fixing box 20 has fixing holes 21a formed on both sides of the upper portion of the rectangular main body 21, and has an insertion hole 22 for inserting and fixing the connecting rod 5 on the front side, and the main body 21 A rectangular depression 23 for installing the tilt control unit 30 is provided on one side of the upper part of the tilt control unit 30, and vertical holes 23a are formed at intervals in the depression 23, and between the vertical holes 23a A transverse hole 23b is formed, and insertion holes 23c communicating with the inside of the insertion hole 22 are formed on both sides of the inner length of the recessed part 23, and on both sides of the main body 21, the connection assembly part 10 ) and the hinge shaft portion 24 and the guide groove jaw 25 are integrally formed, spring fixing grooves 26 are formed, and a through hole 27 is formed on one side where the spring fixing groove 26 is formed. .

The through hole 27 is a hole for guiding the insertion protrusion 12 on the connecting shaft part 11 side during the left and right tilt operation of the backrest part 1 .

On the other hand, based on the drawing, a round guide groove is formed on the rear surface of the fixing box 20, and in this guide groove, a round rotary piece integrally provided in the connection assembly part 10 of the backrest part 1 ( 16) is positioned so that when the backrest frame 1a is tilted left and right, the rotating piece guides the rotation in the tilt direction along the round guide groove. The rotating piece 16 passes through the end side of the fixing screw shaft (S) fastened to the connecting shaft portion 11, and one end thereof is assembled to cover the end of the fixing screw shaft with a cover for finishing.

The tilt control unit 30 is for selecting or blocking the left and right flow of the backrest part 1 from the fixing box 20, and the guide can move back and forth in the vertical hole 23a of the recessed part 23. A guide protrusion 31a protrudes from the bottom, and an inclination adjustment hole 31b is formed between the guide protrusion 31a, and guides to the insertion hole 23c of the fixing box 20 on both sides of the length side A fixed key 31 having a support piece 31c for controlling the entry of the insertion protrusion 12 is seated on the top of the recessed portion 23 and fixed with a fastening screw S, and a long hole ( 32a) is formed, and a cover plate 32 equipped with a guide member 32b is provided on one side of the long hole 32a and an operating shaft 33a is provided on the lower side of the long hole 32a to cover the long hole 32a of the cover plate 32. It is slide-adjusted to adjust the position of the inclination adjustment hole 31b of the fixed key 31 to move the fixed key 31 back and forth, and on one side, the guide piece 33b guided by the guide member 32b is integrated. It consists of an operating lever 33 provided with.

The cover plate 32 is formed with a coupling hole 32c fixed as a separate fastening screw in accordance with the fixing hole 21a provided on both sides of the upper portion of the fixing box 20.

Reference numeral 6 in the drawings indicates armrests connected and installed from both sides of the seat portion.

The action according to the use of the chair having the tilt function of the present invention configured as described above is as follows.

The user performs desk work, etc. in a state of sitting on the seat 2a of the chair 100 and leaning against the backrest 1, that is, in a correct posture with the lumbar spine supported according to the shape of the backrest seat 1b. .

As shown, the swivel chair 100 can comfortably pick up or move objects by turning the body in the left or right direction with the supporting leg 4 as the main axis and changing the frontal position of the body in the left and right radials based on the chair.

Alternatively, when the back is tilted back while leaning against the back seat 1b, the connecting rod 5 connected to the connecting part 3 located on the lower side of the seat plate part 2 is connected to the hinge part 3a of the connecting part 3 as a starting point. As shown in the attached FIG. 8, the backrest part 1 is generally in a state of being tilted back, so that the user can take a rest in a comfortable posture.

In the chair of the present invention, the connection assembly part 10 provided on the lower side of the backrest frame 1a of the backrest part 1 is interconnected from the fixing box 20 side into which one side of the connecting rod 5 is inserted and fixed. Therefore, as shown in FIG. 5, the tilt operation is performed in the left or right direction.

This is because when the user moves the body (upper body) to the left and right while leaning on the back seat 1b as described above, the connection shaft portion 11 of the connection assembly unit 10 tries to tilt with the fixing screw shaft S as the starting point. The backrest 1 can be tilted to the left or right along with the rearward tilting operation of the connecting rod 5.

That is, the backrest part 1 can be tilted to the left and right including the normal rearward direction, and the rearward tilt ('go' direction), rightward tilt ('b' direction) and Each tilt is made possible in the left direction tilt ('many' direction).

In addition, in the 'E' direction to the 'car' direction, the user can implement the tilt operation including the rear direction at the same time, and when the seat is tilted only in the left or right direction of the backrest 1 in a state in which the rearward tilt operation is not performed, the seat The part 2 and the armrests 6 on both sides maintain their correct positions.

The fact that the seat portion 2 and the armrest 6 maintain their correct positions is that only the back portion 1 is tilted in the left and right directions, so that the seated hip portion does not tilt and the user's back portion rotates around the lumbar spine. It refers to a form of tilting along with the back seat 1b to the left or right.

This tilt motion is a motion for the user to pick up an object next to him, and it has the effect of concurrently exercising the user's waist. It is one of the movements that can relieve back fatigue.

As described above, in the operation of tilting the backrest part 1 in the left and right directions, the side of the connection assembly part 10 of the backrest frame 1a located on both sides of the fixing box 20 fixes the spring of the fixing box 20 The coil spring 13 fixed through the groove 26 and the connection assembly unit 10 assists the return with a natural elasticity when returning after the tilt operation. That is, the user supports the operation of returning to the original position while leaning on the back, so that the left and right tilt operation of the backrest 1 is realized naturally, and when the user does not perform the tilt operation, the user supports the back and waist correctly. can provide comfort.

As described above, the left and right tilt operation of the backrest part 1 can control the rotation of the connecting shaft part 11 according to the selected position of the operation lever 33 of the tilt control part 30 installed in the fixing box 20.

The insertion protrusion 12 formed on the connecting shaft part 11 is guided through the through holes 27 provided on both sides of the fixing box 20 during the tilt operation of the backrest part 1 as described above. When the selection position of the operating lever 33 of the tilt control unit 30 is positioned as shown in (a) shown in FIG. 7, the tilt operation of the backrest 1 in the left and right directions is not performed The backrest part is fixed like a general chair type.

When the operation lever 33 is moved to a fixed position, the operation shaft 33a on the side of the operation lever 33 slides through the long hole 32a on the cover plate 32 side, and at this time, the guide member 33b on the cover plate side slides. As a reference, the guide member 32b on the side of the operating lever 33 moves horizontally.

The operation shaft 33a is connected to the horizontal hole on the bottom side of the recessed part 23 through the tilt adjustment hole 31b of the fixing key 31 located in the recessed part 23 of the fixing case 20 of the cover plate 32. (23b), when the operating lever 33 moves horizontally, the fixed key 31 advances within the recessed part 23, and the support piece 31b of the fixed key 31 moves forward within the recessed part 23. It enters the insertion hole 23c and blocks the insertion protrusion 12 on the side of the connection shaft 11 from entering the inside of the fixing box 22.

From this time, by blocking the entry of the insertion protrusion 12, the connection shaft portion 11 is limited in rotation from the hinge shaft portion 24 of the fixing box 20.

Contrary to the above, when the operation lever 33 is pulled inward, the fixing key 31 is pulled backward by the operation shaft 31a so that the support piece 31b escapes from the insertion hole 23c in the recess 23. The insertion protrusion 12 on the connecting shaft part 11 side is allowed to enter the inside of the fixing box 22, so that the backrest part 1 can be tilted in the left and right directions as described above.

Therefore, as described above, the chair having a tilt function according to the present invention can realize not only the backward tilt of a conventional chair, but also the tilt operation that combines both the rear tilt and the left and right sides. You can easily take a posture that tilts your body (sitting back).

In particular, the above-mentioned rear tilt operations combining left and right can reduce the resistance applied to the backrest when the user is in a posture of excessively tilting the backrest to the side while sitting in a chair, so that the user can lean in a more comfortable posture.

Moreover, the connection part of the chair is easily damaged by reducing the resistance of the backrest frame (1a) connected to the connection part (3) side of the seat part (2) according to the number of repetitions of leaning the weight of the upper body on the back part (1). provides an advantage in preventing

As described above, the present invention has been described by specific details such as specific components and limited embodiments and drawings, but these are provided to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments. , Those skilled in the art in the field to which the present invention belongs can make various modifications and variations from these descriptions.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and it will be said that not only the claims to be described later, but also all modifications equivalent or equivalent to these claims belong to the scope of the present invention. .

1: backrest part 1a: backrest frame
1b: back seat 2: seat portion
2a: seat seat 3: connection part
3a: hinge part 4: support leg
5: connecting rod 10: connecting assembly
11: connecting shaft portion 12: insertion protrusion
13: coil spring 20: fixed enclosure
21: main body 22: insertion hole
23: depression 23a: vertical hole
23b: rail hole 23c: insertion hole
24: hinge shaft portion 25: guide groove jaw
26: spring fixing groove 27: through hole
30: tilt control unit 31: fixed key
31a: guide protrusion 31b: inclined adjustment ball
31c: support piece 32: cover plate
32a: long hole 32b: guide member
33: operating lever 33a: operating shaft
33b: guide 100: chair
P: shaft pin S: set screw shaft

Claims (4)

A backrest portion 1 to which a backrest seat 1b is attached to the front of the backrest frame 1a, a seat portion 2 provided with a seating seat 2a on the upper portion and connected to the backrest portion, and a seat plate provided at the bottom of the seat portion In the chair 100 having a tilt function composed of a connection part 3 for adjusting the height of the part and supporting rotation of the seat plate, and a support leg 4 connected to the lower part of the connection part,
A hinge part (3a) is provided on one side of the connection part (3), and the connecting rod (5) is rotatably connected to the hinge part with a shaft pin (P), and one side of the connecting part (3) is connected to one side of the connecting rod (5) A fixing box 20 for insertion and fixation and connection with the backrest frame 1a is coupled, and on one side of the lower part of the backrest frame 1a, the left and right backrest leans against the backrest part 1 based on the seat plate part 2 A connection assembly part 10 for tilting in the direction is provided and connected and assembled to the fixing box 20, and the fixing box 20 has a tilt control unit ( 30) is a chair having a tilt function, characterized in that the assembled installation.
According to claim 1,
In the connection assembly part 10 of the back frame 1a, connection shaft parts 11 are provided in parallel from both sides of the bottom to the front and are connected to both sides of the fixing box 20 by a fixing screw shaft S to be rotated. On one side of the connecting shaft part 11, an insertion protrusion that is guided to the inside of the fixing box 20 according to the left and right tilting operation of the backrest part 1 or is restricted from entering the fixing box 20 by the tilt control unit 30 (12) is provided, and on the side of the connecting shaft portion (11), a coil spring (13) is penetrated and interposed from the side of the fixing box (20) so that elasticity is imparted to both sides.
According to claim 1,
The fixing box 20 has fixing holes 21a formed on both sides of the upper portion of the rectangular main body 21, and has an insertion hole 22 for inserting and fixing the connecting rod 5 on the front side, and the main body 21 A rectangular depression 23 for installing the tilt control unit 30 is provided on one side of the upper part of the tilt control unit 30, and vertical holes 23a are formed at intervals in the depression 23, and horizontal holes 23a are formed between the vertical holes ( 23b) is formed, and insertion holes 23c communicating with the inside of the insertion hole 22 are formed on both sides of the inner length of the recessed portion 23, and are connected to the connection assembly portion 10 on both sides of the main body 21. The hinge shaft portion 24 and the guide groove jaw 25 to be assembled are integrally formed, spring fixing grooves 26 are formed, respectively, and a through hole 27 is formed on one side where the spring fixing groove 26 is formed. Characterized in that A chair with a tilt function.
According to any one of claims 1 to 3,
The tilt control unit 30 is guided by the longitudinal hole 23a of the recessed part 23 so that a guide protrusion 31a protrudes from the bottom so as to be able to move forward and backward, and a tilt adjustment hole between the guide protrusion 31a is formed ( 31b) is formed, and on both sides of the length side, a fixing key 31 having a support piece 31c formed on both sides of the length side and guided by the insertion hole 23c of the fixing box 20 to control the entry of the insertion protrusion 12;
The cover plate 32 is seated on the upper part of the recess 23 and fixed with a fastening screw S, has a long hole 32a formed on one side of the upper part, and has a guide member 32b on one side of the long hole 32a. class,
An operating shaft 33a is provided at the bottom of one side and is slide-adjusted through the long hole 32a of the cover plate 32 to adjust the position of the inclination adjustment hole 31b of the fixing key 31 to fix the fixing key 31 A chair with a tilt function, characterized in that composed of an operating lever 33 integrally provided with a guide piece 33b guided by the guide member 32b on one side.

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