KR101374075B1 - A chair with improved waist bearing power - Google Patents

Abstract

The present invention relates to a chair with an improved waist bearing power which automatically controls the position of a seat and tension of a back plate with elasticity to support a user's waist stably when a back plate link is rotated by the user's weight. The chair with the improved waist bearing power comprises: a support part connected to a leg part; a seat part of which one side is connected to the support part; a back plate post of which lower end is fixed to the support part; a back plate frame of which one side of the upper portion is connected to the top of the back plate post; a back plate link of which the top portion is inserted into an insertion hole formed in the rear side of the bottom center of the back plate frame so as to come into contact with the insertion hole and of which the bottom portion is rotatably connected to the seat part; a link fixture connected by a connection shaft to rotate the back plate link and fixed to the back plate post; and a back plate connected to the top portions of the back plate frame and the back plate link and having flexibility. When the user seats on the seat part, the top portion and the bottom portion of the back plate link are rotated downwardly on the connection shaft, the bottom center of the back plate frame is pushed and moved in the front end direction (F) of the chair, and at the same time, the back plate connected to the top portion of the back plate link is pulled downwardly in the direction of the seat part, such that the back plate tension on the waist of the user who seats on the seat part is controlled automatically.

Description

[0001] The present invention relates to a chair having improved waist bearing capacity due to its weight,

The present invention relates to a chair in which the waist supporting force is strengthened by its own weight, and the tension of the back plate having elasticity is automatically adjusted by the weight of the seated person sitting in the seat portion, and the weight of the back plate can be stably supported by the seated person. It relates to a chair that is strengthened waist support.

Generally, a chair is widely used for a very long time in a home, an office, a field, or the like, and is composed of a chair frame, a seat part arranged on the chair frame, a backrest part and an armrest part.

In recent years, there has been a need for a chair that can provide a user with the best feeling of seating and comfort during sitting, which can relieve the fatigue of the user even if he or she sits for a long time.

In particular, if you study or work for a long time, your posture will be disturbed, and this incorrect posture may cause a strain on your spine, which can cause disc or vertebral flexion, It is very important to induce or support the waist of the seated person.

In order to relieve the fatigue of a seated person, a chair with its backrest tilted backward is widely used. However, the chair with its backrest is tilted backward, so that the backrest support portion is lost and the waist of the user is more inconvenient In order to take a comfortable rest, an auxiliary cushion is placed between the backrest and the user's back so as to support the back of the user. This auxiliary cushion has a problem of being lost, and when the auxiliary cushion is used for a long time, So that the auxiliary cushion does not play the role of a new cushion.

Patent Registration No. 10-0434997 (May 28, 2004) Published Patent Publication No. 10-2009-0017947 (2009.02.19) Registration Utility Model Registration No. 20-0464707 (2013.01.09) Patent Registration No. 10-0499792 (Jun. 28, 2005)

It is an object of the present invention that the back link is rotated by the weight of the seated person, and the tension of the back plate with the seat portion and elasticity is automatically adjusted so that the back support is strengthened by the weight that can stably and firmly support the seat of the seated person. It is to provide a chair.

It is a further object of the present invention to provide a seat occupancy control apparatus and a seat occupancy control method for a seat occupant, which is capable of reducing the waist and foot load of a user due to long- Thereby providing a chair with enhanced bearing capacity.

The present invention is connected to the support portion is installed on the leg, the seat portion is connected to one side of the support portion, the back post is fixed to the lower end is installed on the support, the back frame is connected to the upper side of the top of the back post, The back link is inserted into the insertion groove formed in the bottom rear center of the frame, the back link is coupled to the lower end is rotatably coupled to the seat, the link link is connected by the coupling shaft so that the back link is rotatable and fixed to the back post And, it is configured to include a back plate is installed to be connected to the upper end of the back frame and the back link has elasticity,

When the user seats the seat, the seat and the upper end and the lower end of the back link are rotated downward about the coupling axis, while pushing the center of the bottom of the back frame in the direction of the front end (F) of the chair, By pulling the back plate connected to the seat downward toward the seat portion, the back tension of the user's waist portion seated in the seat portion is to be automatically adjusted.

According to the present invention, the back link connected to the seat part is rotated by the force applied to the seat part (user's own weight), and the lower side of the back plate installed on the back frame by the rotation of the back link pulls toward the seat part. Since the tension of the back plate is increased, a moderate pressure is applied to the waist portion of the seated occupant sitting in the seat portion, so that the user's waist is naturally supported, thereby reducing the fatigue of the user.

The present invention can efficiently support the user's waist just by sitting in the seat portion, thereby minimizing user fatigue.

In the present invention, when the user is seated in the seat portion, the back link is rotated to pull the back frame downward in the direction of the seat while pushing the back frame in the front direction, so that the back tension of the part where the user's back and waist contact As a result, the waist of the user is firmly supported, and one side of the back plate positioned above the waist has a relatively soft state, thereby providing a comfortable and stable support for the upper part of the user.

According to the present invention, the tension of the back plate having elasticity is automatically adjusted by the rotation operation of the back link due to the user's own weight. When the back plate is assembled and installed on the back frame, the back plate is stably supported to support the user's back and waist. Since it is not necessary to adjust the tension of the over, it is possible to improve the back assembly.

According to the present invention, the back plate is made of a material having elasticity, and thus it is possible to more stably support the support force for the user's waist by tension and elastic force.

According to the present invention, the waist of the user is supported ergonomically and at optimum pressure for each user.

According to the present invention, since the waist of the user is actively supported, the user can have comfort and prevent posture from being disturbed even after sitting for a long time, and can prevent and alleviate the pain of the user.

In the present invention, the seat portion and the backing frame provided with the backing plate are rotatably connected by the backrest link so that when the user who is seated on the seat portion tilts the upper body toward the front portion, the seat portion is inclined downward forward, The posture can be easily maintained.

That is, the present invention is to be inclined forward downward by the back frame, the back link, the spring, the link anchor, so that when the user has a forward posture (posture that the user seated on the seat tilts the upper body forward) To reduce the burden on the user and reduce the pressure on the buttocks and thighs, the user may reduce fatigue.

In addition, since maintaining the forward posture minimizes the burden on the body and improves the concentration, it can improve the work efficiency and the study efficiency by improving the work concentration of the user.

The present invention is made of a simple structure in which the seat portion and the backing frame is connected to each other by a backlink, it is possible to reduce the assembly time, reduce the production cost, easy maintenance and protrude outside There is no configuration, so problems (jamming, tearing, etc.) due to the user's clothes are not generated, and there are many effects such as a simple appearance in terms of visual design.

1 is an illustration showing a configuration according to the present invention;
Figure 2 is an exemplary view showing a coupling relationship according to the present invention (excluding the seat portion and the support portion)
3 is an exemplary view showing a configuration of a back frame according to the present invention;
4 is an exemplary view showing the configuration of a back link according to the present invention;
5 is an exemplary view showing a configuration of a link fixing stand according to the present invention
Figure 6 is an exemplary view showing the connection of the back link, the link anchor and the spring in accordance with the present invention
Figure 7 is an exemplary view showing a change in back tension in accordance with the operation of the back link of the present invention
8 is an exemplary view showing an operating state of the present invention
FIG. 9 is a detailed view of "D", "E" in FIG. 8;
10 is an exemplary view showing a user forward posture for the present invention.

1 is an exemplary view showing a configuration according to the present invention, Figure 2 is an exemplary view showing a coupling relationship according to the present invention (excluding the seat and the support), Figure 3 is an illustration showing the configuration of a back frame according to the present invention 4 is an exemplary view showing a configuration of a back link according to the present invention, FIG. 5 is an exemplary view showing a configuration of a link fixing stand according to the present invention, and FIG. 6 is a back link, a link fixing stand and 7 is an exemplary view showing a connection relationship of the spring, Figure 7 is an exemplary view showing a change in back tension according to the operation of the backlink of the present invention, Figure 8 is an illustration showing an operating state of the present invention, Figure 9 is Detailed views of "D" and "E", and Figure 10 shows an exemplary view showing a user forward posture for the present invention,

The present invention is fixed to the support portion 20 is connected to the leg portion 10, the seat portion 30 is installed to be connected to the lower end portion is rotatable on one side of the support portion 20, the support portion 20 The back post 40 is to be, the back frame 50 is connected to the upper side of the top of the back post 40 is installed, and the upper end into the insertion groove 54 formed in the lower rear center 56 of the back frame 50 Is inserted into contact with the back link 60, the lower end is rotatably coupled to the lower end of the seat portion, the back link 60 is connected by the coupling shaft 81 so as to be rotatable and fixed to the back post 40 Is configured to include a link fixing stand 80 and the backing frame 50 and the backing 70 is provided to be connected to the upper end 62 of the backing link and has elasticity,

When the seat 30 of the user is seated, the upper and lower ends of the back link 60 are rotated downwardly about the coupling shaft 81 by the seat 30 so that the bottom center 53 of the back frame 50 is rotated. Pushes and moves in the direction F of the chair, and pulls the back plate 70 connected to the upper end 62 of the back link 60 downward in the direction of the seat part 30, thereby seating the seat 30. The back tension of the user's seated on the back is to be adjusted automatically.

The present invention is characterized in that one end is contactably supported in the link fixture 80 and the other end is in contact with and supported on one side of the back link 60 through the link fixture 80 and the link fixture 80 (Not shown).

The leg portion 10 is provided with a plurality of rotary wheels 12 at the bottom of the support frame 11, to support and move the seat portion 30 and the support portion 20 in the center of the support frame 11 It has a central support 13 for. The central strut 13 is composed of a cylinder driven by gas pressure, hydraulic pressure, pneumatic pressure or the like, and the structure of the leg portion is well-known, and a detailed description thereof will be omitted.

One side of the support portion 20 is connected to the seat portion 30 by the front end seat shaft 33, and the back plate 40 and the leg portion 10 are respectively connected to the other side, and the center support 13 of the leg portion is installed. It is connected to the top and is moved by the operation of the central branch. Since the support 20 is a well-known configuration that is widely used in a chair, a detailed description thereof will be omitted.

The seat portion 30 is fixed to the seat plate 31 seated by the user, the lower surface of the seat plate 31 is connected to the support portion 20 by the front seat shaft 33, the rear seat shaft 34 It includes a fixing bracket 32 is connected to the back link (60) by.

As shown in FIG. 2, the back post 40 has a lower post 42 that is connected to the support 20, and a lower post 42 that is bent to form a predetermined inclination angle with the lower post 42. The frame 50 includes an upper post 41 connected by a backrest 43.

That is, the climbing post 40 has an upper end of the upper post 41 is coupled by the climbing frame 50 and the climbing shaft 43, the connection portion (top) 41 and the lower post 42 is connected ( 44 is bent to be bent downward in the direction of the support portion 20 while retreating in the rear end direction (B) of the chair, the end of the lower post 42 is connected to the support portion 20 is fixedly installed.

The back post 40 configured as described above has the lower post 42 and the upper post 41 having an inclined 'b' shape as a whole and are integrally formed.

The back frame 50 is to be supported by the back plate 70 is installed, as shown in Figures 1 and 3, one side of the top is connected to the top of the back post 40 by the back shaft 43 In addition, an insertion groove 54 having an open shape in a lower direction and a rear end direction B is formed at the lower center rear face 56.

The insertion groove 54 is the upper end 62 of the back link 60 is inserted into contact, the contact inclined surface 55 is formed on both sides of the back link upper end 62 is moved in pressure contact.

In addition, the back frame 50 has a contact portion 52 which is located at the same height as the waist of the user is protruded convexly bent in the front end direction (F), that is, the back of the seated user.

As shown in FIGS. 4 and 6, the back link 60 is rotatably connected to the link fixing stand 80 by the coupling shaft 81, and the end of the lower end 63 is the rear seat shaft 34. It is installed rotatably to the seat portion 30 by a), the roller cover 65 is bolted to the upper end 62 to form a back fitting groove 68, the back frame on both sides of the roller cover 65 The rolling roller 69 which is rolled along the contact inclined surface 55 of the insertion groove 54 is rotatably installed.

The upper end 62 and the lower end 63 are the upper part 62, the lower part located at the upper side with respect to the coupling shaft 81 when assembling the back link 60 and the link fixing stand 80. The lower end 63 is called, and the upper end 62 and the lower end 63 are integrally formed.

The roller cover 65 is bolted to the upper end 62 to form a back fitting groove 68, as shown in Figures 6 and 9, the cover back surface 66 in contact with the upper end 62 The lower part is formed to have a step 67, and when bolted to the upper end 62, by the step 68b, it is opened downward between one side of the upper end 62 and the cover back surface 66 in contact with it. The back fitting groove 68 is formed. The back fitting groove 68 is fixed by fitting the lower end of the back plate.

The pressure roller 69 is rotatably installed at both sides of the roller cover 65, and when one side of the upper end 62 of the back link 60 is inserted into the insertion groove 54 of the back frame, an insertion groove ( 54) contact with the contact inclined surface 55 formed to be located on both sides of the inside, and is moved along the contact inclined surface while pushing the contact inclined surface during rotation of the back link.

The back link 60 configured as described above is formed to have a 'C' shape as a whole, and the middle portion is rotatably installed to the link fixing stand 80 by the coupling shaft 81, so that the roller cover 65 ) Is installed, the upper end 62 and the lower end 63 connected to the seat portion is rotated up or down about the coupling shaft (81).

In addition, when the back link 60 is rotated about the coupling shaft 81, one side of the upper end 62 or the lower end 63 is in contact with the link fixing stand 80 so that the rotation radius is limited.

The back plate 70 is made of a flexible, excellent elastic material, such as fabric, mesh, etc., as shown in Figures 7 and 9, fixed to the back frame 50 to have a predetermined tension, partially cut The lower middle portion 71 is fitted into the back fitting groove 68 of the back link 60.

That is, the back plate 70 is formed so that the lower end portion 71 is partially cut, the remaining portion except the lower center portion 71 is fixed along the back frame 50, the lower center portion 71 is the back fitting groove 68 is installed to be inserted into the fixing.

At this time, the bottom center portion 71 of the back plate is installed so that the end is fixed in the back fitting groove 68, the coupling of the bottom center portion 71 and the back fitting groove 68 of the back plate by the fitting material (strip) It is preferable to be made by fitting.

In addition, the connection installation of the back plate 70 is made by a well-known method, such as fitting connection installation using a mounting connection installation or fitting material (strip, etc.), or fixedly installed on the backboard frame by bolting, etc. Is omitted.

In addition, when the back plate is connected to the back frame by the fitting material (strip), the fitting groove 57 may be further formed to fit the back plate along the circumference of the back frame.

The back plate 70 is connected to the back frame 50 and the back link 60, the tension by the weight of the user seated on the seat 30, in particular, the tension of the user's waist contact portion is adjusted Will support the waist of the.

That is, the back plate 70 is installed to be connected to the back frame 50, the bottom center portion 71 formed by partially cut is connected to the back link 60, the seat portion 30 around the coupling shaft 81 In other words, when the upper end 62 of the backlink 60 is rotated downward, the lower end central part 71 of the backplate is pulled toward the seat portion 30 by the upper end 62 of the backside link rotated. In addition, the tension of the back plate 70 formed in this way generates a force that is rotated in a direction to raise the upper end 62 of the back link link 60 about the coupling shaft 81, so that the center portion of the back plate The tension is applied (generated) in the up and down direction, so as to stably and firmly support the waist of the user.

The link fixing stand 80 supports the back link 60 so as to be rotatable by the coupling shaft 81, and one side of the upper end 62 or the lower end 63 of the back link 60 contacts the back link 60. In order to limit the rotation radius of the), as shown in Figures 1 and 2, it is fixed to the back post 40 to be located between the back post 40 and the back link 60, the back post 40 The body 82 is fixed to the bolt, and the protrusion coupling bar 83 coupled by the back link 60 and the coupling shaft 81 is formed to protrude from the body 82.

That is, the back link 60 is axially coupled to the protrusion coupler 83 of the link fixing table 80 so as to be rotatable by the coupling shaft 81, the back link is rotated about the coupling shaft 81 ( The upper end 62 or the lower end 63 of the 60 is in contact with one side of the link fixing stand 80 which is located at the upper and lower portions of the protruding coupling 83 to limit the rotation radius (angle).

Chair 100 according to the present invention configured as described above,

The support 20 is coupled to the leg 10, the back post 40 is coupled to the support 20, and the back post 40 and the back frame 50 are connected by the back shaft 43. have.

In addition, the support portion 20 and the seat portion 30 is connected by the front seat shaft 33, the seat portion and the back link 60 is connected by the rear seat shaft 34, the back link (60) Is rotatably connected to the link anchor 80 fixed to the back post 40 by the coupling shaft (81).

In addition, the back frame 50 and the back link 60 is connected so that the pressure roller 69 of the back link is inserted into the insertion groove 54 of the back frame, the back frame 50 and the back link (60). The back plate 70 is connected to and installed, so that the seat part 30, the back link 60, the back frame 50, the back post 40 and the support part 20 according to the present invention are centered on each connected axis. In addition to being rotatable, when the user sits on the seat portion 30, the position of the back frame 50 and the seat portion 30 is not only variable by mutual interaction, the back link 60 is coupled shaft 81 Rotate around the center, and pushes the bottom center 53 of the backboard frame 50 in the front end direction (F), and at the same time pulls the bottom center part 71 of the backboard downward to vary the tension of the backboard. do.

In addition, the present invention, as shown in Figures 2, 6, 8, the spring 90 may be further installed between the link anchor 80 and the back link 60, the spring 90 is coupled The coupling shaft 81 is positioned in the link fixing stand 80 so as to have an elastic force for moving the lower end portion 63 of the back link about the shaft 81.

That is, the spring 90 has both ends supported in contact with the link anchor 80, the center portion is supported in contact with one side of the back link 60, and has an elastic force to rotate the lower end portion 63 of the back link. It is installed on the link fixing stand (80). The spring 90 may be a torsion spring or the like.

In addition, since the spring 90 is installed in the link fixing stand 80 so that the elastic force is transmitted to the back link 60, the configuration of the link fixing stand 80 according to the spring 90 installation does not need to be particularly limited. As shown in FIG. 5, the link fixing stand 80 is formed with a spring installation groove 84 into which a spring 90 is inserted into the body, and protrudes from the link fixing unit so as to communicate with the spring installation groove 84. One side of the spring 90 penetrates the base 83 so that a spring through-hole 85 for contacting and supporting the one side of the back link 60 is formed. In addition, the back link 60 may be further formed with a spring support hole 61 which is in contact with the spring.

That is, when the link fixing stand 80 is formed as described above, the spring 90 has an elastic force to move up the upper end 62 of the back link is installed, the roller cover 65 around the coupling shaft (81). The coupling shaft 81 is installed to be located in the spring installation groove 84 of the link fixing.

The spring 90 is installed so that both ends are in contact with one side in the spring installation groove 84, the middle portion penetrates through the spring through hole 85 to protrude to the outside of the link fixing stand, and thus the spring through hole 85 The middle part of the spring protruding from the bottom of the spring link 60 is in contact with and supported by one side (or spring support hole) of the rear end of the lower part 63.

When the spring 90 is further installed between the back link 60 and the link fixing stand 80 as described above, the lower end portion 63 of the back link 60 around the coupling shaft 81 by the elastic force of the spring 90. That is, since the force for rotating the back link 60 so that the portion connected to the seat portion 30 is rotated upward, the restoring force to the initial state (unseated state of the user or the seat portion state of the forward posture) is increased Will be.

That is, the back link 60 is rotated about the coupling shaft 81 by the back tension and the elastic force of the spring 90, so that the rear end of the seat portion 30 to which the rear seat shaft 34 is connected is lifted. The seat part 30 is inclined downwardly in the tip direction F (a state in which the user is conveniently seated in a correct posture).

In addition, when the user is seated in the seat portion, the back link 60 is rotated while compressing the spring 90, the collision force between each component is reduced. Reference numeral 110 denotes a chair armrest portion.

Hereinafter, the operation of the present invention will be described.

- When the user is not sitting

As shown in (a) of FIG. 7, when the back frame, the back plate, the back post, the link fixing stand, and the back link are assembled, the tension is uniformly acted in the center direction of the back plate due to the elasticity (elasticity) of the back plate. The tension of the back plate generates a force that causes the lower end of the back link to which the sheet part is connected about the coupling axis to be rotated upward. (The rear end of the seat where the rear seat axis is located around the leading seat axis)

That is, as shown in Figure 8 (a) and 9, the upper end of the back link is installed in the insertion groove of the back frame by the tension of the back plate is installed, the back link and the back frame is coupled in this way In the case of having a closed state, the lower end of the back link connected to the seat part also maintains the up-rotated state around the coupling shaft, so that the rear end part of the seat part connected to the back link is lifted by the rear seat shaft so that the seat part is in the front direction ( F) is inclined downward downward.

The state of the seat is such that when the user is seated, the hip portion of the user can be attached to the backrest portion, that is, the user can easily sit in a right posture.

In addition, since the back link is rotated around the coupling shaft is rotated only up to a predetermined angle by one side is in contact with the link anchor, the seat portion is always provided in the same state when the user is not seated.

In addition, when the spring is installed, the force to rotate the back link so that the lower end of the back link is raised with respect to the coupling axis by the elastic force of the spring acts together with the tension of the back plate, so that the rear end of the seat portion is lifted up so that the seat portion is in the front direction ( The inclined downward slope to F) is more easily made.

- When you are seated

When the user sits on the seat portion, as shown in FIGS. 8B and 9, the seat portion is rotated downward in the direction of the legs around the shear sheet axis by the user's own weight, and is climbed by the downward rotation of the seat portion. The lower end of the link is rotated downward in the direction of the back post about the coupling axis. At this time, since the upper end of the back link also rotates downward toward the seat portion around the coupling axis, the pressing roller of the back link pushes the contact slope of the back frame to move the cloud so that the lower part of the back frame moves a predetermined distance in the tip direction. As shown in (b) of FIG. 7, the lower center portion of the back plate connected to the back link is pulled in the downward direction, precisely in the lower end direction.

In this way, when the lower center of the back frame is moved in the front end direction F by the rotation of the back link and the lower center of the back plate is pulled by the back link, the tension of the back plate, in particular, the part where the user's spine is located and The tension of the back plate connected to the contact portion is increased to strengthen the support of the user's waist sitting on the seat.

In addition, since the lower end portion of the backlink is rotated about the coupling shaft is one side is in contact with the backpost or the link fixture, when the user's seating seat is rotated only to a predetermined angle to have a constant state.

- Keep your forward position

Figure 10 shows an exemplary view showing a forward posture state when the user is seated for the present invention, the forward posture is to increase the user's work concentration and minimize the burden on the body, reducing the burden on the user, hips And it is a posture to reduce the user's fatigue by reducing the pressure applied to the thigh.

That is, according to the present invention, when the user tilts the upper body forward while the user is sitting on the seat portion, the seat portion is rotationally moved about the front end seat shaft by the movement of the center of gravity of the user so that the rear end portion of the seat portion is lifted. The user can keep the seated state while maintaining the inclined downward inclination.

Such a posture of the seat portion naturally reduces the load on the user's back and reduces the pressure applied to the thighs, thereby minimizing the burden on the user and improving the concentration.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

(10): leg portion (11): support frame
(12): rotating wheel (13): central holding
(20): Support part (30): Sheet part
(31): a seat (32): a fixing bracket
(33): front end seat shaft (34): rear end seat shaft
(40): back post (41): upper post
(42): lower post (43): climbing shaft
(44): connecting portion (50): backing frame
(52): contact portion 53: lower center
(54): Insertion groove (55): Contact slope
(56): Bottom center rear (60): Back link
61: spring support hole 62: upper end
(63): Lower part 65: Roller cover
(66): Cover Rear (67): Step
(68): back fitting groove (69): pressure roller
(70): back (71): lower middle
(80): link fixing bracket (81): coupling shaft
(82): body (83): protrusion coupling
(84): spring mounting groove (85): spring through hole
90: spring 100: chair

Claims (8)

A support portion 20 connected to the leg portion 10,
Seat portion 30 is one side is connected to the support portion 20 is installed,
The back post 40 is fixed to the support 20, the lower end,
The backing frame 50 and the upper one side is installed on the top of the backrest post 40,
The back link 60 is inserted into the upper end portion is inserted into the insertion groove 54 formed in the lower back central 56 of the back frame 50, the lower end is rotatably coupled to the seat portion 60,
A link fixing stand 80 connected by the coupling shaft 81 so that the back link 60 is rotatable and fixedly installed on the back post 40;
It is configured to include a backing frame 50 and the backing 70 is provided to be connected to the upper end 62 of the backing link and has elasticity,
When the seat 30 of the user is seated, the upper and lower ends of the back link 60 are rotated downwardly about the coupling shaft 81 by the seat 30 so that the bottom center 53 of the back frame 50 is rotated. Pushes and moves in the direction F of the chair, and pulls the back plate 70 connected to the upper end 62 of the back link 60 downward in the direction of the seat part 30, thereby seating the seat 30. Chair for strengthening the waist support by the weight, characterized in that the back tension is adjusted automatically for the user's waist portion seated on.
The method of claim 1,
One end of the link fixing stand 80 is contacted and the other end penetrates through the link fixing stand 80 to be supported by one side of the back link 60, and is installed to be located in the link fixing stand 80 by the coupling shaft 81. The chair is strengthened waist support by the weight, characterized in that the spring 90 is further included.
The method of claim 1,
The link fixing stand 80 has a spring installation groove 84 into which the spring 90 is inserted, and is formed therein, and the spring 90 is provided on the protruding coupler 83 of the link fixing unit so as to communicate with the spring installation groove 84. One side of the chair penetrates the waist support by the weight, characterized in that the through-hole 85 is formed so as to be in contact with one side of the back link (60).
The method of claim 1,
The back post 40 has a lower post 42 connected to the support 20, and the lower post 42 has a bend so as to have a predetermined inclination angle, and is integrally formed with the back frame 50. The back support is strengthened by the weight, characterized in that it comprises a top post (41) connected by 43).
The method of claim 1,
The insertion groove 54, the chair is strengthened waist support by the weight, characterized in that the contact inclined surface 55 is formed on both sides of the back link upper end portion 62 is in pressure contact.
The method according to claim 1,
The back link 60 is rotatably connected to the link fixing stand 80 by the coupling shaft 81, the end of the lower end 63 is rotatable to the seat portion 30 by the rear seat shaft 34 The roller cover 65 is bolted to the upper end 62 to form a back fitting groove 68, and pressurized by rolling in the back frame insertion groove 54 on both sides of the roller cover 65. Roller 69 is installed to be rotatable,
The roller cover 65 is formed on the cover rear surface 66 in contact with the upper end 62 so that the lower part has a step 67, and when the bolt is coupled to the upper end 62 by the step 67, the upper part ( 62) The chair is strengthened waist support by the weight, characterized in that the back opening groove 68 is formed between the one side and the cover back surface 66 in contact with it.
delete The method of claim 1,
The back plate 70 is formed so that the lower middle portion 71 is partially cut, the remaining portion except the lower middle portion 71 is fixed to the back frame 50, the lower middle portion 71 is the upper end of the back link The chair is strengthened waist support by weight, characterized in that the installation is connected to (62).

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