KR100510099B1 - Chair enabling to control back side of chair - Google Patents

Abstract

The present invention relates to a chair in which the backrest is automatically moved and adjusted. In a chair having a seat, a backrest, an armrest and a leg,

A protective case means installed between the seat and the support leg so as to be elastically compressed when the user sits on the seat and to be restored to a state before being compressed when the user leaves the seat; When the user is seated on the seat, it is installed to be elastically compressed and restored when the user is seated on the inner case of the protective case means. When the user's weight is loaded on the seat, the fluid pressure is elastically compressed to the outside. A fluid pressure generating means for generating a fluid pressure by releasing and restoring the fluid pressure released during compression by restoring the original pressure when the weight of the user is removed from the seat; When releasing the fluid pressure from the fluid pressure generating means, the piston rod is released (advanced) by the released fluid pressure, while the piston rod is immersed (reversed) when the fluid pressure is recovered from the fluid pressure generating means. Power generating means; The backrest is installed in the inner upper part of the protective case means, and the backrest moves forward and backward in accordance with the forward and backward movement of the piston rod of the power generating means to closely contact the back of the user sitting on the seat. And the backrest is in close contact with the user's back at the same time the backrest moving means is equipped with a moving object which is stopped at the seat; it is an invention comprising a.

Description

Chair enabling to control back side of chair}

The present invention, even if the user wants to sit on the chair is sitting on the front of the seat so that his back does not touch the backrest, the backrest is automatically moved forward to induce the user to sit in a right position by being in close contact with the back of the user It relates to a chair that is automatically moved backrest that can protect the spine.

In general, the back of the chair is formed to support the back when performing tasks such as studying or office work.

The back of the chair has a function to protect the spine by supporting the back of the user sitting on the chair.When sitting on the chair, the back can be protected only by sitting with the back leaning against the back while the hip is positioned behind the seat. You can say that you sit in the right position. That is, the correct posture of sitting on the chair refers to a state in which the lower body's thighs and the torso's torso are almost at right angles.

In addition, the back of the chair is manufactured in an ergonomic structure having a curve like the spine in order to protect the user's spine safely.

Conventional chairs have various structures, such as a structure in which the backrest can be elastically moved from the back to the rear, or a dual back structure in which the backrest is formed in two and supports both sides of the user's back. There is one.

Conventional chairs are formed with the backrest fixed in place so that the user must sit his or her hips deep behind the seat in order to sit on the chair in a correct position. On the other hand, if the user sits with his hips positioned in the middle of the seat, the user cannot lean on his back on the back, so as not to sit on the chair for a long time If you do work in sitting on the spine to give a strain on the fatigue not only quickly, but also abnormalities of the spine, for example, a lumbar disc can cause a factor.

However, students sitting in a chair or adults studying affairs tend to sit in the middle of the seat instead of sitting their chairs on the back of the seat when sitting in a chair. Even in the upper body comfortably and safely do not rely on the chair to feel fatigue quickly, in a severe case giving the spine is a problem that raises the disease, such as lumbar discs.

The present invention was created in order to solve all the problems appearing in the existing chair as described above, even if the user sitting on the chair is sitting on the middle of the seat without leaning on the back of the chair, the backrest automatically by their weight You can sit in the chair in the correct position to protect the spine by moving forward and close to the back, and also the back itself is supported even if the user tilts the upper body back while the backrest moves forward to support the user's back. It is invented for the purpose of providing a chair that can securely support the waist in a stationary state.

The present invention as a means for achieving the above object,

A chair comprising a seat, a backrest, an armrest and a leg,

A protective case means installed between the seat and the support leg so as to be elastically compressed when the user sits on the seat and to be restored to a state before being compressed when the user leaves the seat;

When the user is seated on the seat, it is installed to be elastically compressed and restored when the user is seated on the inner case of the protective case means. When the user's weight is loaded on the seat, the fluid pressure is elastically compressed to the outside. A fluid pressure generating means for generating a fluid pressure by releasing and restoring the fluid pressure released during compression by restoring the original pressure when the weight of the user is removed from the seat;

When releasing the fluid pressure from the fluid pressure generating means, the piston rod is released (advanced) by the released fluid pressure, while the piston rod is immersed (reversed) when the fluid pressure is recovered from the fluid pressure generating means. Power generating means;

The backrest is installed in the inner upper part of the protective case means, and the backrest moves forward and backward in accordance with the forward and backward movement of the piston rod of the power generating means to closely contact the back of the user sitting on the seat. A backrest moving means equipped with a movable body which is stopped at the same time when the backrest is in close contact with a user's back;

It characterized in that configured to include.

And, the protective case means,

An upper case opened downward while being fixedly attached to the bottom of the sheet;

A lower case fixedly attached to an upper end of the support leg and inserted into the lower end of the upper case to allow the upper and lower movements of the upper case while the upper end is opened;

When the user is sitting on the seat is characterized in that the lower case is supported on the top of the support leg, and only the upper case is configured to move downward with the seat by the user's weight,

The fluid pressure generating means,

A tube body installed in a state in which fluid pressure is injected and filled between an inner support frame fixed to an inside of an upper case of the protective case means and a lower case;

A plurality of springs elastically installed at one central portion of the tube body and several outer portions of the tube body;

When the user is seated on the seat and the tubular body is elastically compressed with the springs to release the fluid pressure, while the user is released from the seat is configured to recover to the state before compression while recovering the released fluid pressure It is characterized by

The backrest moving means,

An upper plate on which a reverse control gear is formed in a longitudinal direction while being fixedly attached to an inner upper portion of the upper case of the protective case means;

A guide body fastened and assembled by a plurality of assembly bolts to the bottom of the upper plate while the upper part is opened;

A lower plate fixedly mounted to an inner bottom of the guide body and having a runway formed in a longitudinal direction and a forward control gear formed at both sides of the runway;

The upper and lower stopper gears meshed with each of the forward and backward controller gears are installed on the inside of the guide body in such a way as to be movable in the longitudinal direction and are symmetrically formed at upper and lower sides of a diagonal line. A moving body equipped with two rollers which move in rolling state while being supported on the runway of the lower plate;

The connecting end of each of the two backrest connecting frames is connected to each other by rotatably supporting the rollers through the two shaft holes formed in the movable body, respectively, through both moving passages formed to face each other in the longitudinal direction on both sides of the guide body. Two support shafts;

It is characterized in that the backrest is configured to be moved together when the moving body moves forward and backward in the longitudinal direction in the guide body of the backrest moving means, including,

The power generating means,

A cylinder body fixedly installed at the bottom of the guide body of the backrest moving means;

An operation tool which is connected to the end of the piston rod of the cylinder body and moves forward and backward in the longitudinal direction from the bottom of the main body according to the oscillation (forward and backward) operation of the piston rod;

Both side connectors which are fixedly attached to both sides of the actuating tool so as to protrude vertically toward each connecting end of both backrest connecting frames connected to both sides of the guide body of the backrest moving means;

A support pin installed at both ends of the support hole formed at the upper ends of the both side connectors while penetrating the pin holes of the moving body through both moving passages of the guide body of the backrest moving unit;

A fluid transfer pipe connecting the tube body and the cylinder body to supply or recover the fluid pressure injected into the tube body of the fluid pressure generating means to the cylinder body;

It is characterized in that it is configured to include,

In addition, the immersion operation of the piston rod of the cylinder means is characterized in that it is configured to be made by the elastic return force of the return spring elastically installed on the front side of the operating port.

An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are a side view and a front view of a chair for explaining the present invention, Figure 3 is a cross-sectional view taken along the line AA of Figure 1, Figure 4 is a main part of the present invention showing the coupling state of the backrest moving means and the back connection frame 5 is an exploded perspective view of the backrest moving means and the power generating means of Figure 4, Figures 6 to 8 is a side cross-sectional view for showing the operating state of the present invention, Figure 9 is a user of the present invention An enlarged cross-sectional view illustrating a state in which the movable body of the backrest moving means moves forward or rearward when the backrest is not leaned on the backrest, and FIG. 10 shows the movable body of the backrest moving means when the user of the present invention leans back on the backrest. , Is an enlarged cross-sectional view for showing a state locked to the reverse controller, Figure 11 is a cross-sectional view of the line BB of Figure 6, Figure 12 is a moving body of the backrest moving means is a forward The installation state diagram of the torsion spring for releasing the lock is shown.

Reference numeral 1 denotes a chair. The chair 1 is provided with a seat 11, a support leg 12, a backrest 13 and an armrest 14.

The seat 11 is composed of a structure that allows the user to sit comfortably like the existing chairs, the support leg 12 is also possible to adjust the height and height as in the existing many chairs and in an unfolded state Each of the plurality of supporting feet formed is configured to include a structure in which the wheel is attached.

And the backrest 13 and the armrest 14 is composed of a structure that is moved to the front, rear, unlike the existing chair, it is a feature of the present invention that the backrest and armrest is configured to be moved to the front, rear in this way .

The configuration for enabling the backrest 13 and the armrest 14 to be movable forward and backward will be described.

Between the seat 11 and the support leg 12, a protective case means for the elastic cushioning operation in the up and down direction of the seat 11, and the seat 11 by the protective case means A fluid pressure generating means for generating a fluid pressure during a lowering buffer operation, that is, a compression and restoring operation, and a power generating means for generating moving power forward and backward by the fluid pressure generated by the fluid pressure generating means, and The backrest moving means for moving the backrest 13 forward and backward by the power generated by the power generating means is comprised.

First, the protective case means will be described.

The protective case means includes an upper case 2a having a lower portion open while being fixedly attached to the bottom of the sheet 11 and a lower case 2b having an upper portion fixedly attached to an upper end of the support leg 12. The lower end of the upper case 2a is installed to be movable up and down while wrapping the upper end of the lower case 2b.

In addition, the lower end of the upper case (2a) and the upper end of the lower case (2b) is formed with engaging portions (21) (22) so as not to relax with each other. Therefore, when the user sits on the seat 11, the upper case 2a can move downward together with the seat 11 by the weight of the user, while the upper case 2a when the user does not use the chair 1 Since the locking portion 21 of the lower case 2b is caught by the locking portion 22 of the lower case 2b, the user grabs the chair 11 or the armrest 14 to move the chair 1 to another place. 1) When lifting the support leg 12 will be heard together.

Next, the fluid pressure generating means includes a tube body 3 elastically compressed and restored inside the lower case 2b, a fluid pressure injected and filled in the tube body 3, and the tube body ( 3) is elastically compressed and consists of a number of springs 31 to allow for rapid recovery after compression.

The tube body 3 has a corrugated structure with an outer circumferential surface so that compression and restoration operations can be performed well, and the tube body 3 is protected by upper and lower protective devices 32 and 33.

The upper protector 32 is installed in a state capable of sliding up and down along the outer wall of the lower protector while the lower protector 33 is wrapped.

The plurality of springs 31 are installed in a total of five places to serve to help the elastic compression and recovery operation of the tube body (3). That is, as shown in FIG. 11, it is provided in four outer side of the tube body 3, and one center of the tube body 3, respectively.

Each spring 31 is used as a compression spring formed in a coil shape, and each spring 31 is installed in the upper and lower protection pipes 34 and 35. The upper protective tube 34 is installed in a structure capable of sliding up and down in a state in which the lower protective tube 35 is wrapped.

In addition, a fluid access pipe 36 for extruding and recovering the fluid pressure is formed at one lower end of the tube body 3.

The fluid pressure injected and filled into the tube body 3 is selected from pneumatic, gas pressure, and hydraulic pressures.

Next, the backrest moving means includes a top plate 41 fixedly fixed to the inner bottom of the upper case 2a fixedly installed at the bottom of the seat 11, and a guide body fixed to the bottom of the top plate by a plurality of bolts. 4), a lower plate 42 fixed to the inner bottom of the guide body, a movable body 43 installed to be movable forward and backward in the longitudinal direction while being installed in a concealed state inside the guide body, and the movable body Two rollers 44a and 44b rotatably installed on the rollers and rotatably supporting the rollers 44a and 44b, and simultaneously guide the respective connecting ends 151 of the backrest connecting frames 15 on both sides. It consists of two support shafts 45a and 45b for movably connecting to both sides of the main body 4.

A reverse control gear 411 is formed at the bottom of the upper plate 41.

The runway 421 is formed in the center of the upper surface of the lower plate 42 to allow the two rollers 44a and 44b to slide in the longitudinal direction, and the forward control gears are formed on both sides of the runway 421. 422 is formed.

The movable body 43 is formed of a hexahedron having a size that can be moved forward and backward in a state of being inserted into the guide body 4, and the movable body can rotatably accommodate two rollers 44a and 44b. The roller mounting hole 431 is formed in a state where the upper and lower penetrates, and the movable body has two shaft holes 43a and 43b which penetrate both sides in a horizontal direction, and the movable body 43 An upper stopper gear 432 is formed in an inclined shape on the top end side of the upper surface of the movable body 43 to engage with the reverse control gear 411 to suppress the reverse operation of the movable body 43 itself. The lower stopper gear 433 which engages with the advance control gear 422 and suppresses the forward operation of the moving body 43 is formed in inclined shape.

In addition, the two rollers 44a and 44b are rotatably inserted into the long holes 431 formed in the movable body 43, and the centers of the rollers 44a and 44b are two shaft holes 43a ( 43b) Rotation is freely supported by the two support shafts 45a and 45b which are inserted in a state corresponding to each of them, and thus the two rollers supported by the support shafts 54a and 45b are Is exposed at the bottom of the movable body 43 is supported by the runway 421 of the lower plate 42 to move the cloud along the runway.

Both ends of each of the two support shafts 45a and 45b are protruded to both sides through the moving passages 4a and 4b which are formed lengthwise on both sides of the guide body 4, and thus the guide body 4 Both ends of each of the support shafts 45a and 45b protruding from both ends of the support shafts 151 are connected to each other.

In the above, the two support shafts 45a and 45b connected to the connection ends 151 of each of the backrest connecting frames 15 secure the both connection ends 151 and the rollers of the movable body 43. 44a, 44b is a satisfactory configuration if the structure has a rotatable structure, in the embodiment of the present invention, the male shaft is formed on both ends of each of the support shafts 45a, 45b, and then the nut 451 is screwed. Both connection ends 151 are fixedly connected to both ends of each of the support shafts 45a and 45b. In addition, both sides of the connection end 151 fixedly connected to both ends of each of the support shafts 45a and 45b together with the movable body 43, the movable body 43 so that the movement operation to the front and rear can be made smoothly. Between each of the connecting ends 151 and each of the cylindrical interval maintaining 452 is provided on each side of each of the support shaft (45a, 45), one each.

The spacing holders 452 in the above are embedded in the state that can move freely inside the moving passage (4a) (4b) formed on both sides of the guide body (4).

And inside the upper case (2a) is formed an inner support frame 46 for receiving each component constituting the backrest moving means, the upper end of the inner support frame 46 is the upper case (2a) It is fixedly attached to the upper surface, and the lower end of the inner support frame is configured to compress the tube body 3 of the fluid pressure generating means.

On the other hand, the upper protection device 32 for protecting the tube body 3 of the fluid pressure generating means is formed in a structure protruding from the lower end of the inner support frame 46, the lower protection device 33 is a lower case ( 2b) is formed in a structure protruding from the bottom, and the upper protective barrels (34) for protecting each of the plurality of springs (31) elastically installed in one center and four outside of the tube body (3) are internally supported It is formed in a structure protruding to the bottom of the frame 46, the lower protective barrel 35 is formed in a structure protruding from the bottom of the lower case (2b).

In addition, a presser plate 47 is embedded between the inner support frame 46 and the tube body 3 so that the inner support frame 46 can compress the tube body 3 horizontally.

Next, the power generating means is coupled to the front end of the cylinder body 5 which is fixedly installed at the bottom of the main body 4 of the backrest moving means and the piston rod 51 actuating toward the front of the cylinder body. Fastening to both ends of the operating port 53, which is installed to enable the forward and backward operation toward the front, the return spring 54 is elastically installed in front of the operating port 53, On both ends of the connector 55 and protruding upward while fixedly attached to the bolt and the like, support holes 551 formed on the upper ends of the both connector 55 and the connection end 151 of each of the backrest connecting frame 15, respectively. A support pin 56 penetrating through the formed inlet hole 152 and the moving passages 4a and 4b of the guide body 4 and the pin hole 434 formed in the movable body 43 and the rear end of the cylinder body 5. To the tube body 3 by connecting a fluid access pipe 36 formed at one lower end of the tube body 3 of the fluid pressure generating means. It is composed of yucheyi songgwan (57) for transferring the fluid pressure in the filling mouth.

The cylinder body 5 is installed in a state fixed to the bottom of the guide body 4 by the fastening band 58, the return spring 54 is fixed to the inner support frame 46 In the state accommodated in the (59a) and the moving tube (59b) installed to be retracted into the fixed tube is installed in a structure that elastically supports the operating port (53).

The support pin 56 moves along with the operation tool 53 to move the moving body 43 forward and backward.

In addition, the support pin 56 is provided with a torsion spring 561 elastically installed to maintain the movable body 43 in a horizontal state, the torsion spring of the two ends of the support shaft (45a, 45b) The two rollers 44a and 44b, which are elastically supported and mounted on the movable body 43, can be rolled in a state of being in elastic contact with the runway 421 at all times, while the movable body 43 moves one side of the support shaft 45b. When the rotating body rotates clockwise in the drawing to be inclined, the movable body 43 is restored to its original position (horizontal state).

In addition, the fluid transfer pipe 57 has a function of transferring the fluid pressure discharged from the tube body to the cylinder body 5 during the compression operation of the tube body 3 and the fluid pressure discharged from the cylinder body 5. 3) It performs the action of conveying and at the same time elastically compresses when the inner support frame 46 moves downward while compressing the tube body 3, and the original state when the inner support frame moves up (the state before compression) Consists of a corrugated pipe that is smoothly restored to work.

Meanwhile, each of the backrest connecting frames 15 supporting the backrest 13 has one end fixedly attached to both ends of the backrest 13 as shown in FIGS. 3 and 4 by bolts, and the other end thereof is a seat. A moving hole 23 formed long in the longitudinal direction (front and rear directions of the sheet) on both sides of the upper case 2a and the inner support frame 46 in a state of being bent toward the bottom of the sheet by the middle portions of both sides of (11). The connecting ends 151 formed at the ends of the guide body 4 of the backrest moving means penetrate through the 461 are connected to two support shafts 45a and 45b. Accordingly, when the movable body 43 is moved forward or rearward by the support shafts 45a and 45b of the backrest moving means, both backrest connecting frames 15 are simultaneously moved together. Therefore, the backrest 13 will also move together.

In addition, the moving holes 23 formed on both upper ends of the upper case 2a and the moving holes 461 formed on both upper ends of the inner support frame 46 allow both backrest connecting frames 15 to move forward and backward. The two backrest connecting frame 15 is able to move forward and backward together with the movable body 43.

In addition, the armrest frame 16 is integrally formed in the two backrest connecting frames 15, and the armrest 14 is formed at the upper ends of the armrest frames 16. Therefore, when the backrest 13 moves forward and backward, the armrest 14 is also moved together.

Then, the components of the guide body 4 and the backrest moving means such as the movable body 43 for moving the two backrest connecting frames 15 are arranged in a row in the longitudinal direction before and after the bottom of the seat 11. Since the backrest connecting frame 15 connected to both ends of the support shafts 45a and 45b on both sides of the movable body 43 of the backrest moving means may be inclined at the left and right sides of the seat 11. In order to prevent this, two guide rails 6 are formed so that the backrest connecting frames 15 can move forward and backward while keeping the horizontal at all times.

The two guide rails 6 are formed of four brackets 61 fixedly protruding downwardly, one for each of the four corner portions of the upper portion 2a of the upper case 2a fixedly attached to the bottom of the sheet 11. 11) Based on the left and right sides of the seat, the guide rails 6 are installed on each of the two brackets facing each other from the front and the rear so as to be parallel to each other toward the front and the rear. On the bottom of each of the backrest connecting frames 15 across the upper side of the guide rail 6 while being located on both inner sides of the upper case 2a, a movement guide 7 having a cross-section "∩" shape is welded. .

The movement guide (7) is a state surrounding the upper, left, and right side of the guide rail (6), and the cross section protruding toward the guide rail (6) is semicircular (or elliptical) at the top of the movement guide (7). The protrusion part 71 of the () is formed, The protrusion part 71 is supported on the upper part of the guide rail 6 in a slidable state. Therefore, the two backrest connecting frame 15 is able to move in a stable state along the guide rail 6 without being inclined to the left and right or separated by the guide rails 6 on both sides, and the protrusion 71 is a movement guide. Since the sphere 7 is supported by the guide rail 6 and is inclined in the forward and rearward directions, the movement guide 7 is supported by the user when the user leans against the back 13. The connecting frame 15 is to allow the inclination.

The operation of the present invention configured as described above will be described.

First, FIG. 6 illustrates a state in which the chair 1 is not used, that is, before the user sits on the seat 11, and the backrest 13 is pushed completely to the rear. The armrest 14 is also located in the middle of both sides of the seat 11, and the upper case 2a of the protective case means is moved up, in which case the tube body 3 of the fluid pressure generating means. Is an uncompressed state, and the actuating tool 53 of the power generating means is a state in which the piston rod 51 is immersed (reversed) in a state of being retracted by the elastic force of the return spring 54.

In addition, the movable body 43 of the backrest moving means maintains the horizontal state, and the upper and lower surfaces of the movable body 43 at this time are the reverse control gear 411 of the upper plate 41 and the forward control gear 422 of the lower plate 42. ), Only two rollers 44a and 44b are in contact with the runway 421 in a relaxed state.

7 shows a state in which the user sits in the middle of the seat 11, in which case the upper case 2a and the inner support frame of the protective case means by the weight of the user to be loaded on the seat 11 As the 46 is lowered, the pressing plate 47 compresses the upper portion of the tube body 3 of the fluid pressure generating means, and when the tube body 3 is compressed in this way, the fluid pressure filled therein is reduced. The fluid transport pipe 59 is discharged and transported through the fluid entry pipe 36. The fluid transport pipe 59 is formed as a corrugated pipe, so that the fluid pressure is smoothly transferred without being blocked even when compressed with the tube body 3. .

As described above, when the fluid pressure discharged to the fluid transfer tube 57 by the compression operation of the tube body 3 flows into the rear end of the cylinder body 5 of the power generating means and pushes the piston head, the piston rod 51 Since the actuating opening 53 moves forward while elastically compressing the return spring 54, the actuating opening 53 moves forward when the cylinder 53 is moved forward. The support pins 56, which are supported at both ends in the support holes 551 at the upper ends of the both end connectors 55 fixedly attached to both ends, are also moved forward, so that the support pins 56 move the movable body 43 forward. The two rollers 44a and 44b rotatably mounted to the movable body 43 are rolled along the runway 421 of the lower plate 42 and the upper and lower surfaces of the movable body 43 are The upper plate 41 and 42 are not in contact with each other (see FIG. 9). Movable body 43 is smoothly moved forward along the advancing operation of the operating opening (53).

In addition, when the movable body 43 is moved forward, both backrest connecting frames 15 connected to both ends of each of the two support shafts 45a and 45b are also moved forward, so that the backrest 13 is also moved. Moving forward toward the user sitting on the seat 11, such a forward movement is made until the backrest 13 is in close contact with the back of the user sitting on the seat (11).

8 shows that the operation port 53 moves forward a little further by the appearance of the piston rod 51 which continues in a state in which the backrest 13 moves forward and close to the user's back and cannot move forward anymore. Since the moving body 43 can no longer move forward and rotates in a clockwise direction on one side (right in the drawing) of the support shaft 45b as the starting point, in this case, the backrest 13 ) Is in a state of pushing the user's back to the appropriate pressure, the connection ends 151 of the back frame connecting frame 15 is inclined as much as the movable body 43 is inclined. The upper stopper gear 432 formed on the upper surface of the movable body 43 is engaged with the reverse control gear 411 of the upper plate 41, and the lower stopper gear formed on the lower surface of the movable body 43. The 433 is engaged with the forward control gear 422 of the lower plate 42 (see FIG. 10), and the geared state of the gears is more robust when the user leans against the back 13. It is in a state of being engaged.

Therefore, even if the user sits in the middle of the seat 11, the backrest 13 moves forward and close to his back, so that the user sits in a chair in a correct posture with his back in close contact with the backrest 13. You will be able to see your work (study, work, etc.).

In addition, when the user rises from the chair 1, the force applied to the seat 11 and the backrest 13 is removed. In this case, the torsion spring 561 elastically installed on the support pin 56 of the movable body 43 is preferentially removed. Due to the elastic restoring force, the movable body 43 itself is rotated in the counterclockwise direction with the one side (right side in the drawing) roller 44b as the starting point, and the other side (left side in the drawing) roller 44a returns to its original position. And the upper and lower stopper gears 432 and 433 are relaxed in the forward and backward control gears 422 and 411, and the movable body 43 is movable. Accordingly, when the user sits in the middle of the seat 11 and pulls back a little further forward, the user's back falls off the backrest 13 and the movable body 43 is also movable. State, ie back of the user 13 When the space is created and the movable body 43 is movable, the back pressure 13 comes into close contact with the back of the user since the fluid pressure causes the piston rod 51 of the cylinder body 5 to appear (advance) by the user's weight. Will move forward until Therefore, while the user is sitting on the chair 1, the backrest 13 always supports the user's back.

When the movable body 43 is movable as described above and the weight of the user is removed from the seat 11, the tube body 3 of the power generating means no longer releases the fluid pressure, The resilient compression force of the return spring 54, which has been elastically compressed, is actuated in the operating tool 53, and the plurality of springs 31 in the center and the outer four places of the tube body 3 are also originally in a compressed state. The elastic restoring force which tries to return to the state becomes the state which acts. Therefore, by the elastic restoring force of the return spring 54, the operating port 53 is driven backward to immerse the piston rod 51 into the cylinder body 5, and the fluid pressure injected into the cylinder body 5 is It is recovered to the tube body 3 through the pipe 57.

When the operating port 53 is the reverse operation in the above, the moving body 43 is also reversed, and as the moving body 43 moves backwards, both backrest connecting frames 15 are also moved backwards, so that the backrest 13 and Armrest 14 is to move to the original position (see Figure 6).

The present invention as described above is a function of the general chair (back chair is fixed to the back of the seat) function (when the user sits so that his hips are located behind the seat in a correct position to the back back to the back) In addition to the ability to sit, the backrest automatically moves forward when the user sits in the middle of the seat instead of sitting behind the seat so that it is in close contact with the user's back to support the back. When sitting in a chair, you can sit at the back of your back at all times to protect your spine by protecting your spine, especially from young children to adolescents. Protects against spinal disorders and helps grow healthy The invention to provide a.

1 and 2 are side and front views of a chair for explaining the present invention.

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a coupling phase of the backrest moving means and the backrest connecting frame which is the main part of the present invention;

       Perspective to show the womb.

5 is an exploded perspective view of the backrest moving means and the power generating means of FIG.

6 to 8 are side cross-sectional views for showing an operating state of the present invention.

9 shows the number of backrest movements when the user of the present invention does not lean against the backrest.

       To show the state that the moving body of the stage moves forward or backward

       Magnified section.

10 is a view of the backrest moving means when the user of the present invention leans back on the backrest;

       Magnification stage to show the state that the body is locked to the forward and backward control gear

       shave.

FIG. 11 is a cross-sectional view taken along the line B-B in FIG. 6. FIG.

Fig. 12 is a figure showing that the moving body of the backrest moving means is locked to the forward and backward controller gears.

        The installation state of the torsion spring to make it work.

※ Explanation of code for main part of drawing

1: chair 2a, 2b: upper and lower case

3: tube body 4: guide body

4a, 4b: movement passage 5: cylinder body

6: guide rail 7: movement guide

11: sheet 12: leg

13: back 14: armrest

15: frame connecting the backrest 16: armrest frame

21,22: catching part 31: spring

32: upper protector 33: lower protector

34: upper protective box 35: lower protective box

36: fluid access pipe 41: top plate

42: lower plate 43: moving body

43a, 43b: Axle 44a, 44b: Roller

45a, 45b: Support shaft 411: Reverse control gear

421: runway 422: forward control gear

431: roller mounting hole 432: upper stopper gear

433: lower stopper gear 434: pin ball

51: piston rod 53: operating port

54: return spring 55: connector

56: support pin 57: fluid transfer pipe

58: fastening band 59a, 59b: fixed tube and moving tube

61: bracket 71: protrusion

Claims (6)

A chair comprising a seat, a backrest, an armrest and a leg, A protective case means installed between the seat and the support leg so as to be elastically compressed when the user sits on the seat and to be restored to a state before being compressed when the user leaves the seat; When the user is seated on the seat, it is installed to be elastically compressed and restored when the user is seated on the inner case of the protective case means. When the user's weight is loaded on the seat, the fluid pressure is elastically compressed to the outside. A fluid pressure generating means for generating a fluid pressure by releasing and restoring the fluid pressure released during compression by restoring the original pressure when the weight of the user is removed from the seat; When releasing the fluid pressure from the fluid pressure generating means, the piston rod is released (advanced) by the released fluid pressure, while the piston rod is immersed (reversed) when the fluid pressure is recovered from the fluid pressure generating means. Power generating means; The backrest is installed in the inner upper part of the protective case means, and the backrest moves forward and backward in accordance with the forward and backward movement of the piston rod of the power generating means to closely contact the back of the user sitting on the seat. A backrest moving means equipped with a movable body which is stopped at the same time when the backrest is in close contact with a user's back; The chair is automatically moved backrest, characterized in that configured to include. The method of claim 1, The protective case means, An upper case opened downward while being fixedly attached to the bottom of the sheet; A lower case fixedly attached to an upper end of the support leg and inserted into the lower end of the upper case to allow the upper and lower movements of the upper case while the upper end is opened; When the user is seated on the seat, the lower case is in a state supported on the top of the support leg, and the upper back is configured to automatically move downward toward the lower side with the seat by the user's weight. Telescopic chair. The method of claim 1, The fluid pressure generating means, A tube body installed in a state in which fluid pressure is injected and filled between an inner support frame fixed to an inside of an upper case of the protective case means and a lower case; A plurality of springs elastically installed at one central portion of the tube body and several outer portions of the tube body; When the user is seated on the seat and the tubular body is elastically compressed with the springs to release the fluid pressure, while the user is released from the seat is configured to recover to the state before compression while recovering the released fluid pressure Chair characterized in that the backrest is automatically moved. The method of claim 1, The backrest moving means, An upper plate on which a reverse control gear is formed in a longitudinal direction while being fixedly attached to an inner upper portion of the upper case of the protective case means; A guide body fastened and assembled by a plurality of assembly bolts to the bottom of the upper plate while the upper part is opened; A lower plate fixedly mounted to an inner bottom of the guide body and having a runway formed in a longitudinal direction and a forward control gear formed at both sides of the runway; The upper and lower stopper gears meshed with each of the forward and backward controller gears are installed on the inside of the guide body in such a way as to be movable in the longitudinal direction and are symmetrically formed at upper and lower sides of a diagonal line. A moving body equipped with two rollers which move in rolling state while being supported on the runway of the lower plate; The connecting end of each of the two backrest connecting frames is connected to each other by rotatably supporting the rollers through the two shaft holes formed in the movable body, respectively, through both moving passages formed to face each other in the longitudinal direction on both sides of the guide body. Two support shafts; Chair including the backrest is automatically configured to move so that the backrest is also configured to move together when the moving body moves forward and backward in the longitudinal direction in the guide body of the backrest moving means. The method of claim 1, The power generating means, A cylinder body fixedly installed at the bottom of the guide body of the backrest moving means; An operation tool that is connected to the front end of the piston rod and moves forward and backward in the longitudinal direction at the bottom of the guide body according to the oscillation of the piston rod; A return spring resiliently installed on the front side of the actuating tool; Both side connectors which are fixedly attached to both sides of the actuating tool so as to protrude vertically toward each connecting end of both backrest connecting frames connected to both sides of the guide body of the backrest moving means; A support pin installed at both ends of the support hole formed at the upper ends of the both side connectors while penetrating the pin holes of the moving body through both moving passages of the guide body of the backrest moving unit; A fluid transfer pipe connecting the tube body and the cylinder body to supply or recover the fluid pressure injected into the tube body of the fluid pressure generating means to the cylinder body; The chair is automatically moved backrest, characterized in that configured to include. The method according to claim 1 or 4, The upper case of the protective case means further includes a guide rail for supporting the backrest frame to be horizontal so as not to tilt and guiding the backrest frame to move horizontally forward and backward along the moving body of the backrest movement means. The chair is automatically moved backrest, characterized in that configured by.