KR20090002905A - Breast-plate of chair - Google Patents

Abstract

A breastplate for the chair is provided, which supports the body when a user leans the upper body at the front. A breastplate for the chair comprises: a first rotary motion part(200) including a first drum(210) and a second drum(220); a first interference groove which is perpendicularly penetrated into the inner circumference of the fluid path groove(320) and is formed at the upper side; an inlet port(340) in which a hole of cylinder is formed at one side of the front; a first main body(310) equipped with a second interference groove; a second bond groove which is inserted into the inlet port of the first main body and receives the end of the pressure pin(352); a second rotary motion part consisting of the secondary body; and a breastplate frame(400) which is coupled through the second interference groove and of which one side is bent and extended to the outer side.

Description

Breastplate for Chair {Breast-plate of chair}

The present invention relates to a chair breastrest, and more particularly, to simplify the configuration and adjust the configuration of the adjustment device to be located on the chest portion by configuring the breastrest device on the armrest of a chair such as an office chair, etc. It is about a chair chest.

In general, the chair has a seat plate is formed so that the user can sit, the back is installed on the back so that the user can lean on the back, the seat plate is formed with an armrest so that the user can comfortably place the arm .

For example, the office chair is composed of a seat plate armrests are installed on the left and right sides, a backrest installed upright on the back of the seat plate, a headrest installed on the top of the backrest, a lower support installed on the seat plate to support the chair.

Most chairs have a fixed armrest, but in recent years, for the convenience of the height-adjustable form of the trend has been widely spread.

In other words, the armrest of the chair is in the form that the height can be adjusted according to the user's body, the armrest height adjusting device is a method of selectively locking the pins to a few grooves by operating the handle, rack gear and pinion gear combination Most of them are of manual control type.

Considering the conventional chair structure, the focus is on the safety and comfort of the head, back, arms, etc. of the body and has limitations in the technology, and does not consider the protection of the chest and the stability of the posture during the construction of the body. When manufacturing a chair, the backrest, the seat plate, and the armrest are attached with importance.

In particular, the user sitting in a chair for a long time such as the examinee increases the load on the spine as the seating time elapses, resulting in stiffness in the lower back or disability in the spine, resulting in force on the arm. Accordingly, the hand is transmitted by the force of the arm, causing an unstable posture, such as writing, resulting in intensive anxiety and fatigue of the study, and the user quickly exhausts from the chair.

In addition, when sitting on a chair, the seated person is usually seated in a state of bending the upper body toward the desk with the upper body removed from the back, rather than sitting in a state of continuously keeping his upper body completely in the backrest. This is common.

If you are sitting for a long time in such a state, as mentioned above, you will have a lot of pressure on your body such as spinal column, neck, arm, etc. As time goes on, you will feel nervous anxiety or physical Pain is inflicted.

In order to give the comfort of such a conventional problem and posture has been filed in the application for the chair in the application No. 0030822 filed to provide a new technology based on this technology.

The present invention is to adjust the installation angle to be installed on the chest part of the seat occupant's chest or the upper part of the upper body portion to support the body of the seated person so that the body is supported by the body when the seated person leans forward To develop a chair equipped with a breastrest.

The present invention can adjust the installation angle to be installed on the chest part of the seat occupant's chest or the upper part of the upper body so that the body is supported by the chest when the seated person leans forward to the body The object of the present invention is to provide a chair's breastplate that maintains the natural curve of the seated vertebrae to maintain a comfortable seating state and induces a mental stability by improving efficiency in performing work for a long time. Leave.

Chair according to the present invention is configured as follows, there is an advantage to improve the convenience of the user by solving the problems according to the existing backrest and armrest by mounting the chestrest on the chair.

In addition, the user can perform the study and work for a long time by the breastrest, and the efficiency is improved, thereby providing a chair that can relieve physical fatigue and give mental stability, and the user's body skeleton according to the sitting position It can induce the right balance and customized body shape, which has the advantage of being convenient.

In order to achieve the above object, the following embodiments will be described in detail with reference to the accompanying drawings.

(Example 1)

As shown in FIG. 1, the chair support 20 of the present invention includes a seat plate having both armrest bodies 35 and both armrests 30 formed of support members 36 supporting the armrest bodies 35. The conventional chair 10 which consists of 40, the backrest 50 extended substantially perpendicularly to the back of the seat plate part 40, and the frame 60 which supports these backrest 50 and the seat plate part 40. To

The upper surface of the both sides of the armrest main body 35 is provided in a plate shape, the bottom surface is provided on the rear end of one side of the upper surface is provided with a connecting groove 110 is formed with a cylindrical groove, the inner side of the connecting groove 110 on each of the left and right sides The first fixing groove 120 is provided with a plurality of, in the shape of a circle around the spaced apart relative to the outer periphery of the upper connection groove 110 is spaced at regular intervals with a slope of inclination angle of 30 ° ~ 60 ° The support part 100 is provided with a stop groove 130,

The first binding groove 215 is inserted into the connection groove 110 of the support part 100 so as to be interlocked left and right by interfering with the first fixing pin 125 bound to the first fixing groove 120. The first drum 210 having a cylindrical shape is formed, and the second fixing groove 230 is formed horizontally on the upper end of the first drum 210, the second fixing groove 230 penetrated downward on one surface of both ends of the upper surface. Is formed, the second fixing pin 235 is fastened to cause interference with the support groove 100, the stop groove 130 in the second fixing groove 230 and a plurality of third binding holes 236 on both sides A first rotating part 200 formed of the formed second drum 220,

A cover 315 is provided on the second drum 220 of the first pivot part 200 and fastened by a bolt 700 on an upper surface thereof, and a surface connected to a bottom surface and a rear surface forms a streamlined shape, and a left and right side surface. An elliptical horizontally penetrating flow path groove 320 is formed at the end, and a first interference groove 330 vertically penetrating the inner circumferential surface of the flow path groove 320 is formed at an upper surface thereof, and a cylindrical hole is formed at one side of the front surface. An inlet 340 is provided, and a first body 310 is formed in which a second interference groove 350 penetrates perpendicularly to an inner circumferential surface of the inlet 340 on an upper surface thereof.

Sides installed on both sides to accommodate the first body 310, and a surface connected to the front from the top surface is formed with a curved curved portion 361, the projections 362 arranged at a predetermined interval inside the curved portion (361). Is formed, is inserted into the flow path groove 320 of the first body 310, the insertion ball 332 and the spring 331 provided through the first interference groove 330 interferes with the forward and backward movement First rods (325) are inserted into the flow path groove 320 so that the first binding holes (363) for binding both ends of the movable rods (325) are formed inside, respectively, the second drum of the first pivot (200) The first and second plate members 360a having a vertical plate formed with a plurality of second binding holes 364 formed at lower ends thereof to be fastened by bolts 700 to the third binding holes 236 formed on both sides. 360b),

The pressure pin is inserted into the inlet 340 of the first body 310 and interferes with the pressure pin 352 and the spring 351 provided through the second interference groove 350 to cause rotation. A second binding groove 372 is formed to receive an end of the 352, and is formed on an inner surface of the curved portion 361 of the first and second plate members 360a and 360b on an outer circumferential surface extending from the second binding groove 372. A second pivoting part 300 composed of a second body 370 provided with an uneven tooth 371 so as to be accommodated between the projections 362,

The second body 370 is bound to the inner end of the toothed portion 373, the one end is to provide a chair 20 for the chair consisting of a support frame 400 is extended to the outside.

The support part 100 provided on the upper surface of the armrest body 35 may be installed on the upper surface of the armrest body 35 by having a separate support part 100, and the upper surface of the armrest body 35 is the support part 100. It may be provided as.

Next is composed of the first drum 210 and the second drum 220 shown in FIG. 1st rotation department 100 will be described in detail.

The first rotation of the breast frame 400 at a left and right angle is inserted into the connecting groove 110 of the support part 100 and the first of the first drum 210 bound to the first fixing groove 120. The left and right rotation interlocked by interference with the fixing pin 125, and acting as a stopper so as to stop at a desired position by adjusting the left and right angles in the second drum 220, the second fixing groove 230 is provided. The second fixing pin 235 is operated to cause interference to the support groove 100, the stop groove 130 will be described in detail the operation method as follows.

As shown in Figure 12d1 and Figure 12d2 stops having a slope of 30 ° to 60 ° inclination of a plurality of spaced apart at regular intervals in the shape of a circle around the spaced apart from the outer circumference of the support portion 100 upper connection groove 110 The groove 130 is provided as shown in Figure 6 is that the second fixing pin 235 provided through the second fixing groove 230 of the second drum 220 is a plurality of stop groove 130 in one direction The second fixing pin 235 is interviewed to the stop groove 130 inclined by 90 ° when the first interview of the stop groove 130 is rotated while interfering with the interference, and then has a slope of 30 ° to 60 °. Interview the ramp while moving to the next stop groove (130).

On the contrary, when the second fixing pin 235 is about to rotate in the other direction, it is interviewed at a vertical wall of 90 ° of the stop groove 130, thereby preventing the movement of the second fixing pin 235. The left and right angles of the desired position, that is, the stop groove 130 to be interviewed to operate in principle.

On the other hand, in the case where the second fixing pin 235 is restrained by the stop groove 130 and tries to return the breast frame 400 to its original position, the first fixing pin 235 is inserted into the connection groove 110 of the support part 100. The first binding groove 215 of the first drum 210 which is interfered with the pin 125 has more space than the space that can accommodate the first fixing pin 125, so that the first drum 210 and Lifting the connected breastrest frame 400 to the upper part is a second fixing pin 235 constrained to the stop groove 130 is separated to move to the original position to return to normal.

Referring to the internal cross-section of the second fixing pin 235 as shown in Figure 5, a groove is provided in the body, a spring is provided in the groove is internally provided, the one side end is interviewed in the one end of the spring An additional streamlined shape and a ball pin protruding to the outside is installed to constitute a second fixing pin 235.

When the ball pin of the second fixing pin 235 is in contact with the stop groove 130 inclined at 90 °, the ball stops, and then the next stop groove 130 is interviewed while interviewing a slope having a slope of 30 ° to 60 °. Will move.

Next is Figure 7 To  As shown in 11, the first body 310, the second body 370 and the first, 2 plates Consisting of 360a, 360b 2nd dongbu 300 will be described in detail.

As shown in FIG. 7, the bottom surface of the first body 310 is connected to the bottom surface of the first body 310 to have a streamlined shape, and rotate freely without being interfered with the upper part of the second drum 220 of the first rotating part 200. Provided to do so.

8 is installed on both sides to accommodate the first body 310, the surface connected to the front from the upper surface is formed with a curved curved portion 361, arranged at a predetermined interval inside the curved portion (361) In the first and second plate members formed by the protrusions 362, as shown in FIGS. 12A1 and 12A2, the support frame 400 may rotate up and down in an elliptical flow path groove formed in the first body 310. When the moving rod 325 inserted into the front of the inside is changed back and forth position, the front and the front relative to the insertion ball 332 provided through the first interference groove 330 located in the center of the flow path groove 320 Divided into the rear, when the movable rod 325 is located in the front, the movement is free, when the movable rod 325 is to be fixed to a desired position in the center of the flow path groove 320 Interfere with the protruding insertion ball 332 to move backward The operation method will be described in detail as follows.

First, the moving rod 325 is located in front of the flow path groove 320 to move to a desired position, and then move the chest frame 400 associated with the moving rod 325 to the rear of the flow path groove 320, and at the same time The uneven teeth 371 formed on the two bodies 370 are accommodated and fixed between the protrusions 362 formed on the inner surfaces of the curved portions 361 of the first and second plates 360a and 360b. That is, the protrusions 362 formed on the inner surface of the curved parts 361 of the first and second plate members 360a and 360b are accommodated and fixed in the grooves of the concave-convex shape.

On the other hand, when the breast frame 400 is to be returned to its original position, the moving rod 325 located in the rear of the flow path groove 320 is positioned forward to return the breast frame 400 to the original position without being interrupted. do.

The bolt 700 is connected to the third binding holes 236 formed on both sides of the second drum 220 of the first rotating part 200 through the second binding holes 364 of the first and second plate members 360a and 360b. It is bound by and is present in a fixed state, the first body 310 is endowed in the space above the fixed first, second plate (360a, 360b) to the first of the first, second plate (360a, 360b) As shown in FIG. 11, the second binding groove of the second body 370 is bound by the binding hole 363 and at the same time existed in the state of being moved by the moving rod 325 penetrated by the flow path groove 320. 372 is enabled to rotate and move the support frame 400 bound by the pressure pin 352 provided through the second interference groove 350 formed in the upper portion of the first body (310).

It will be apparent that the first rotating part 200 and the first and second plate members 360a and 360b may be formed in an integral form by injection molding.

(Example 2)

The first rotating unit 200 of the first embodiment is the same, but the principle of fixing by adjusting the up and down angle is different and will be described in detail as follows.

13 to 17, in the first and second plate members 360a and 360b provided on both sides to accommodate the first body 310, the first and second plate members 360a and 360b respectively have upper surfaces. The surface connected to the front is a streamlined curved portion 361 is formed, a plurality of horizontal cylindrical cutout 365 is formed from the front surface of the curved portion 361 to the upper surface,

The cylindrical first protrusion pins 374 are formed on both outer sides of the first body 310 accommodated in the cylindrical cutout 365, respectively.

Referring to the operation method of the second embodiment, the moving rod 325 is located in the front and rear of the flow path groove 320 is the same as the principle of the first embodiment to move to a desired position, the breast frame associated with the moving rod 325 The first protrusion pins 374 formed on both sides of the first body 310 are moved to the rear of the flow path groove 320, and the curved portions 361 of the first and second plate members 360a and 360b are moved. It is received and fixed in the cylindrical cutouts 365 arranged at regular intervals from the front to the top.

(Example 3)

Incorporating the principle of vertical movement and fixing the vertical angle of the first embodiment, as shown in Figures 18 to 21, the surface connected to the front from the upper surface of the first, second plate (360a, 360b) is a streamlined curved portion 361 is formed, a planar induction path 366 is formed inside the curved portion 361, and a bottom triangular groove is formed at right angles to be arranged at a predetermined interval on one side of the induction path 366. A plurality of insertion grooves 367 are formed,

A horizontal through hole 311 is formed at one side of the flow path groove 320 of the first body 310 so as to interfere with the insertion groove 367, thereby adjusting a pressure therein in the through hole 311. Is formed, the spring 312 is provided on both ends of the end is provided with a second protrusion pin 313 having a slanted inclined end surface is provided.

The second protruding pins 313 protruding at both sides of the through hole 311 of the first body 310 when the breast frame 400 is moved upward to a desired position are as shown in FIGS. 19A and 19B. The first and second plates 360a and 360b move along the insertion grooves 367 formed inside the curved portion 361, and when moved to a desired position, according to the characteristics of the insertion grooves 367 made of the right triangle grooves. It is impossible to move downward by a right angled surface forming a right angled side of the insertion groove 367, that is, the end surface of the second protrusion pin 313 is inclined to the insertion groove 367 by having a slanted inclined surface in one direction It is possible to move in the reverse direction but not in the opposite direction.

On the other hand, if you want to move the breast frame 400 to the original position is the same as the principle of the first embodiment to move the moving rod 325 to the desired position to the rear of the flow path groove 320, the moving rod 325 The second protruding pin 313 of the first body 310 moves out of the insertion groove 367 and moves the breastplate frame 400 associated with the front of the flow path groove 320 to the first and second plates 360a and 360b. ) Is moved to the induction path 366 of the plane formed inside the curved portion 361 is moved to the lower position to position.

That is, when the second protruding pin 313 is in contact with the insertion groove 367 inclined at 90 °, it is stopped, and then the next insertion groove 367 is interviewed while inclining a slope having a slope of 30 ° to 60 °. Will move.

In addition, as shown in FIGS. 20A and 20B, the second protrusion pins 313 of the first body 310 move away from the insertion grooves 367 to the inside of the curved portions 361 of the first and second plate members 360a and 360b. The shape of the right end of the insertion groove 367, that is, the end of which the second protruding pin 313 is out of the insertion groove 367, forms a streamlined portion in the planar path 366 formed at The second protruding pin 313 is separated from the insertion groove 367 and moved to the induction path, so that the end portion of the insertion groove 367 moves more freely due to the streamlined shape.

(Example 4)

The principle of fixing according to the left and right rotation of the first to third embodiments will be described as follows.

As shown in FIG. 22, the urethane plate 140, which is embedded in the first drum 210 and has a plate-shaped ring shape, has a frictional force with the peripheral surface of the outer circumference of the connection part of the support part 100 and rotates left and right. Interference was caused by friction.

(Example 5)

The second body 370 of the first embodiment is bound to the inner end of the toothed portion 373, and the one end is related to the breast frame 400 is extended to the outside of the length of the breast frame 400 And by adjusting the curved direction of the end of the support frame 400 is characterized in that it is adjusted to the height of the seated person.

As shown in Figure 23 to Figure 27 is provided with a fixed rod 500 endured in the rear end of the tooth portion 373 of the second body 370,

Is fixed to one side of the support frame 400 to adjust the length to be fixed to the fixed rod 500, the diameter 600 is provided with a cam 600 consisting of a small diameter portion 610 and a large diameter portion 620,

The locking jaw 615 is formed on the small diameter portion 610 and the large diameter portion 620 of the cam 600.

Surrounding the small diameter portion 610 and the large diameter portion 620 of the cam 600 and a space portion 651 on the outer peripheral surface corresponding to the locking jaw 615 so that both ends of the space portion 651 protruding jaw ( 652 is provided with a movable piece 650,

According to the rotation of the cam 600, the movable piece 650 is extended or retracted to be in close contact with the inner diameter surface of the fixed rod 500, or the length of the breast frame 400 can be adjusted by maintaining a constant interval. It features.

As shown in FIG. 25, flange portions 630 are formed on both side surfaces of the cam 600 including the small diameter portion 610 and the large diameter portion 620, and the flange portion 630 is fitted to the inner diameter portion of the breast frame 400. Protruding boss 640 is fixed.

As shown in FIG. 24, when the cam 600 is rotated in the direction in which the engaging jaw 615 and the protruding jaw 652 are spaced apart, the movable piece 650 is extended to fix the rod from the breast frame 400. When the cam 600 is rotated while the locking jaw 615 and the protruding jaw 652 are connected to each other, the movable piece 650 is not expanded and idling with the cam 600 is fixed. Done.

The cam 600 is fixed to the end of the breast frame 400 as shown in Figure 27 in order to maximize the workability and the length according to the same operation, but fixed to any part of the breast frame 400 It is desirable to.

As described through the embodiments described above, the chair supporter can be manufactured by various design changes. The principle is limited to the configuration of the present invention through the embodiment, but the general knowledge in the mechanism through the principle is provided. It reveals that the excitation can be easily manufactured by design changes.

1 is a perspective view of the overall structure of a chair having a chair support according to Embodiment 1 of the present invention

Figure 2 is a state of assembling the breastrest for a chair according to the first embodiment of the present invention

3 is a side view of assembling the breastrest for a chair according to Embodiment 1 of the present invention;

Figure 4 is an exploded view of the chair breastrest according to Embodiment 1 of the present invention

Figure 5 is an installation separation for assembling the support and the first rotating part according to the first embodiment of the present invention

Figure 6 is an enlarged view of the "A" portion of the support stop groove according to the present invention of FIG.

7 is an assembled and separated view of the first body of the second pivot part according to the first embodiment of the present invention;

8 is a perspective view of a second plate according to the first embodiment of the present invention

Figure 9 is an enlarged view of the "B" portion of the second plate projection in accordance with the present invention of FIG.

10 is a perspective view of a second body according to Embodiment 1 of the present invention;

11 is an assembled and detached view of a second rotating unit according to Embodiment 1 of the present invention.

12a1 is a configuration diagram for moving the breast frame up and down according to the first embodiment of the present invention

12a2 is a side view of moving up and down the breast frame according to the first embodiment of the present invention;

12b1 is a configuration diagram for rotating the breast frame according to the first embodiment of the present invention

12b2 is a plan view of rotating the breast frame according to the first embodiment of the present invention

12c1 is a configuration diagram for moving back and forth the breast frame according to the first embodiment of the present invention

12c2 is a side view of moving forward and backward the breast frame according to the first embodiment of the present invention;

Fig. 12C3 is an enlarged view of the “C” portion accommodating the teeth of the second body between the protrusions of the first and second plate members according to the first embodiment of the present invention (2).

Figure 12d1 is a configuration diagram for rotating left and right the frame according to the first embodiment of the present invention

12d2 is a plan view of rotating the breast frame according to the first embodiment of the present invention

Figure 13 is a state diagram assembled the chair support according to the second embodiment of the present invention

14 is a perspective view of a second plate according to a second embodiment of the present invention

15 is a perspective view of a first body according to Embodiment 2 of the present invention;

16 is a configuration diagram for moving up and down the breast frame according to a second embodiment of the present invention

Figure 17 is an enlarged view of the "D" portion accommodating the protruding pin of the second body in the cutout of the first and second plate according to the second embodiment of the present invention

18 is an exploded view of a chair support according to Embodiment 3 of the present invention

19A is a perspective view of a second plate according to Embodiment 3 of the present invention.

19B is an enlarged view of the “E” portion of the insertion groove of the second plate according to the third embodiment of the present invention.

20A is a perspective view of a second plate according to Embodiment 3 of the present invention.

20B is an enlarged view of the “F” portion of the insertion groove of the second plate according to the third embodiment of the present invention.

Figure 21 is a perspective view of the protruding pin provided in the through hole of the first body according to the third embodiment of the present invention

Figure 22 is an exploded view in which the urethane plate interfered by the left and right rotation of the first drum of the support and the first rotating part according to the fourth embodiment of the present invention is installed

Figure 23 is an exploded view of the assembled state for adjusting the length of the breast frame according to the fifth embodiment of the present invention

24 is an exploded perspective view for engaging the cam and the movable piece according to the fifth embodiment of the present invention;

FIG. 25 is a sectional view of a "G-G" portion of the cam according to Embodiment 5 of the present invention of FIG.

Figure 26 is a cross-sectional view of the cam according to the fifth embodiment of the present invention fixed to the breast frame frame and the inner rod

<Description of the symbols for the main parts of the drawings>

Chair 10 Chestrest 20 Armrest 30 Armrest Body 35 Support 36 Seat plate 40 Backrest 50 Frame 60 Support 100 Connecting groove 110 First fixing groove 120 First fixing pin 125 Stopping groove 130 Urethane plate 140 First rotating part 200 First drum 210 1st binding groove 215 2nd drum 220 2nd locking groove 230 2nd fixing pin 235 3rd binding hole 236 2nd rotating part 300 1st body 310 Through hole 311 Spring 312 2nd protrusion pin 313 Cover 315 Euro groove 320 1st 1 Interference groove 330 Spring 331 Insertion ball 332 Inlet 340 Second interference groove 350 Spring 351 Pressure pin 352 First plate 360a Second plate 360b Bend section 361 Projection section 362 First engagement port 363 Second binding port 364 Incision 365 Induction furnace 366 Insertion Groove 367 Second body 370 Second binding groove 372 Tooth part 373 First protrusion pin 374 Chest frame 400 Fixing rod 500 Cam 600 Small diameter part 610 Hanging jaw 615 Large diameter part 620 Flange part 630 Protruding boss 640 Moving piece 650 Space part 651 Protruding part Jaw 652

Claims (6)

A seat plate portion 40 having both armrests 30 composed of an armrest body 35 and a support base 36 for supporting the armrest body 35, and a backrest extending substantially vertically to the rear of the seat plate portion 40. In the normal chair 10 which consists of 50 and the frame 60 which supports these backrests 50 and the seat plate part 40, The upper surface of the both sides of the armrest main body 35 is provided in a plate shape, the bottom surface is provided on the rear end of one side of the upper surface is provided with a connecting groove 110 is formed with a cylindrical groove, the inner side of the connecting groove 110 on each of the left and right sides The first fixing groove 120 is provided with a plurality of, in the shape of a circle around the spaced apart relative to the outer periphery of the upper connection groove 110 is spaced at regular intervals with a slope of inclination angle of 30 ° ~ 60 ° The support part 100 is provided with a stop groove 130, The first binding groove 215 is inserted into the connection groove 110 of the support part 100 so as to be interlocked left and right by interfering with the first fixing pin 125 bound to the first fixing groove 120. The first drum 210 having a cylindrical shape is formed, and the second fixing groove 230 is formed horizontally on the upper end of the first drum 210, the second fixing groove 230 penetrated downward on one surface of both ends of the upper surface. The second fixing pin 235 is fastened to cause interference with the support groove 100 and the stop groove 130 in the second fixing groove 230, and a plurality of third binding holes 236 are formed on both sides. The first rotating part 200 consisting of a second drum 220, The cover 315 is positioned on the second drum 220 of the first rotating part 200 and fastened by a bolt 700 on an upper surface thereof. An elliptical horizontally penetrating flow path groove 320 is formed at the end, and a first interference groove 330 vertically penetrating the inner circumferential surface of the flow path groove 320 is formed at an upper surface thereof, and a cylindrical hole is formed at one side of the front surface. An inlet 340 is provided, and a first body 310 is formed in which a second interference groove 350 penetrates perpendicularly to an inner circumferential surface of the inlet 340 on an upper surface thereof. Sides installed on both sides to accommodate the first body 310, and a surface connected to the front from the top surface is formed with a curved curved portion 361, the projections 362 arranged at a predetermined interval inside the curved portion (361). Is formed, is inserted into the flow path groove 320 of the first body 310, the insertion ball 332 and the spring 331 provided through the first interference groove 330 interferes with the forward and backward movement First rods (325) are inserted into the flow path groove 320 so that the first binding holes (363) for binding both ends of the movable rods (325) are formed inside, respectively, the second drum of the first pivot (200) The first and second plate members 360a having a vertical plate formed with a plurality of second binding holes 364 formed at lower ends thereof to be fastened by bolts 700 to the third binding holes 236 formed on both sides. 360b), The pressure pin is inserted into the inlet 340 of the first body 310 and interferes with the pressure pin 352 and the spring 351 provided through the second interference groove 350 to cause rotation. A second binding groove 372 is formed to receive an end of the 352, and an inner surface of the curved portion 361 of the first and second plate members 360a and 360b is formed on an outer circumferential surface of the second binding groove 372. A second pivoting part 300 composed of a second body 370 provided with an uneven tooth 371 so as to be accommodated between the projections 362, It is bound by the pressure pin 352 provided through the second interference groove 350 formed in the upper portion of the first body 310 to the front end of the tooth portion 373 of the second body 370, one side end Chestrest for chairs, characterized in that consisting of an extended breastplate frame 400 According to claim 1, wherein the first and second plate (360a, 360b) is formed in each of the surface connected to the front face of the streamlined curved portion 361, the horizontal cylindrical incision from the front to the upper surface of the curved portion 361 A plurality of parts 365 are formed, Chair chest, characterized in that the cylindrical first protrusion pin 374 is formed on both sides of the outer peripheral surface of the first body 310 accommodated in the cylindrical cutout 365 The surface of the first and second plates (360a, 360b) is connected to the front surface of the curved curved portion 361 is formed, the planar induction path (366) inside the curved portion (361). Is formed, and a plurality of insertion grooves 367 formed of right-angled triangular grooves having a hypotenuse are formed on one side of the induction furnace 366 at regular intervals, A horizontal through hole 311 is formed at one side of the flow path groove 320 of the first body 310 so as to interfere with the insertion groove 367, thereby adjusting a pressure therein in the through hole 311. 2 is formed, the spring 312 is installed on both ends of the chair breastrest, characterized in that the second protruding pin 313 having an inclined end surface is provided According to claim 3, One end of the insertion groove is characterized in that the breastrest for the chair characterized in that the curved portion formed in a streamline The method of claim 1, wherein the first drum (210) is provided with a urethane plate (140) having a plate-like ring shape to interfere with the left and right rotation by placing a frictional force with the peripheral surface of the outer peripheral portion of the connection portion 100 Chairrest, characterized in that configured to receive According to claim 1, wherein the fixing rod 500 is provided in the front end of the tooth portion 373 of the second body 370, Is fixed to one side of the support frame 400 to adjust the length to be fixed to the fixed rod 500, the diameter 600 is provided with a cam 600 consisting of a small diameter portion 610 and a large diameter portion 620, The locking jaw 615 is formed on the small diameter portion 610 and the large diameter portion 620 of the cam 600. Surrounding the small diameter portion 610 and the large diameter portion 620 of the cam 600 and a space portion 651 on the outer peripheral surface corresponding to the locking jaw 615 so that both ends of the space portion 651 protruding jaw ( 652 is provided with a movable piece 650, As the cam 600 rotates, the movable piece 650 is extended or retracted to be in intimate contact with the inner diameter surface of the fixed rod 500 or to maintain a predetermined interval so that the length of the breast frame 400 can be adjusted. Armrests characterized in that

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