KR102444534B1 - Office chair - Google Patents

Abstract

The present invention relates to an office chair, which can allow the inclination of a backrest unit to be adjusted, support the lumbar vertebrae of a user, and provide excellent assemblability. To this end, the office chair of the present invention comprises: a seat unit; a backrest unit; and a connecting unit which connects a lower portion of the seat unit to a rear surface unit of the backrest unit. The backrest unit is composed of a square frame and a hinge frame extended upwards from a lower portion of the square frame, wherein a hinge hole is formed at both sides of an upper portion of the hinge frame. The connecting unit is configured after a seat bracket connected to the seat unit and a backrest bracket connected to the backrest unit are integrally assembled. A reference hole is formed at both sides of the upper portion of the backrest bracket after being arranged to correspond to the hinge hole. The office chair further comprises an axial rotation fastener which connects the backrest unit to the connecting unit such that the hinge hole and the reference hole may be coaxially arranged. Furthermore, the distance between a rear surface portion of a lower side of the backrest unit and a front surface portion of a lower side of the backrest bracket may be adjusted, such that an interval adjustment unit, which allows the inclination of the backrest unit to be adjusted around the axial rotation fastener, may be provided between the rear surface portion of the lower side of the backrest unit and the front surface portion of the lower side of the backrest bracket.

Description

office chair {OFFICE CHAIR}

The present invention relates to an office chair, and more particularly, to an office chair capable of adjusting the inclination of a back plate, supporting the lumbar spine of a user, and having excellent assembly properties.

A general chair includes a seat plate for supporting the user's buttocks, a back plate provided behind the seat plate for supporting the user's back, and a connection part connecting the lower part of the seat plate and the rear part of the back plate.

On the other hand, as the user's body shape is diversified, chairs having a function of adjusting the seat plate or the back plate according to the user's body shape are being developed. In addition, a chair provided with a lumbar support for comfortably supporting the user's lumbar spine has been developed.

However, the conventional chairs are formed in a complex shape in order to implement a function of adjusting the seat plate or the back plate or to implement the lumbar support, so there is a disadvantage in the assemblyability is poor.

Therefore, there is a demand for the development of a chair with excellent assembly properties while implementing a function of adjusting the seat plate or the back plate or implementing the lumbar support.

Korean Patent Application No. 2017-0008567 (2017.01.18)

An object of the present invention for solving the problems according to the prior art is to provide an office chair capable of adjusting the inclination of the back plate, supporting the lumbar spine of the user, and having excellent assembly properties.

The office chair of the present invention for solving the above technical problem is an office chair configured to include a seat plate part, a back plate part, and a connection part connecting the lower part of the seat plate part and the rear part of the back plate part, wherein the back plate part is a square frame and the square frame It is configured to include a hinge frame extending upwardly from the lower part of the frame, hinge holes are formed on both upper sides of the hinge frame, and the connection part includes a seat plate bracket connected to the seat plate part and a back plate bracket connected to the back plate part. This is integrally assembled, and reference holes disposed corresponding to the hinge holes are formed on both upper sides of the back plate bracket, and the back plate part and the connection part are connected so that the hinge hole and the reference hole are coaxially arranged. It is configured to include an axial rotation fastener, and by adjusting the distance between the lower rear portion of the back panel and the lower front portion of the back panel bracket, an interval adjusting unit that adjusts the inclination of the back panel based on the shaft rotation fastener. It is provided between the lower rear part of the back plate and the lower front part of the back plate bracket.

Preferably, the spacing adjusting unit, the gearbox housing assembled to the lower rear portion of the back plate; a spiral screw protruding from the gearbox housing toward a lower front portion of the back plate bracket; and a control block assembled to the lower front portion of the back plate bracket, the control block having a nut screwed to the helical screw embedded therein, and as the helical screw screwed to the nut rotates forward or reverse, the The distance between the lower rear part of the back plate and the lower front part of the back plate bracket is adjusted so that the inclination of the back plate part can be adjusted based on the shaft rotation fastener.

Preferably, the spacing adjusting unit comprises: a first bevel gear shaft-coupled to an end of the helical screw located inside the gearbox housing; a second bevel gear positioned inside the gearbox housing to mesh with the first bevel gear; The second bevel gear and the shaft-coupled end portion is extended to the outside of the gearbox housing, the interval adjustment rotation shaft; and a rotation knob provided at at least one end of the interval adjusting rotation shaft.

Preferably, the seat plate portion includes: a lower plate fixed to the upper portion of the seat plate bracket and assembled; an intermediate plate fastened to the upper portion of the lower plate so as to be slid back and forth with respect to the lower plate; an upper plate fixed to the upper part of the intermediate plate and assembled; and a cushion material provided on the upper surface of the upper plate.

Preferably, the intermediate plate, a plurality of guide slots extending in the front-rear direction; and an insertion hole formed at a rear end of the guide slot with a width wider than the width of the guide slot, wherein the lower plate includes: a protruding piece formed with a width corresponding to the width of the guide slot and protruding upward; and a locking piece formed with a width corresponding to the width of the insertion hole and formed at the upper end of the protruding piece, wherein the protruding piece is inserted through the insertion hole in the front-rear direction along the guide slot It is configured to slide to, and may be configured to prevent the middle plate from being separated from the lower plate by the engaging piece.

Preferably, the intermediate plate is configured to include; a middle elastic wedge formed by being cut in a '∩' shape toward the front, and the lower plate is a lower wedge that can be supported by hooking the front end surface of the intermediate elastic wedge. hall; and a guide groove extending rearwardly from the lower wedge engaging hole, wherein the lower end of the intermediate elastic wedge is caught on the upper portion of the lower plate and elastically deformed upward in a state in which the engaging piece is inserted into the insertion hole, and the In a state in which the protruding piece slides along the guide slot, as the intermediate elastic wedge is restored to its original shape, the locking piece is prevented from moving to a position where it is discharged from the insertion hole, so that the intermediate plate is prevented from being separated from the lower plate. have.

Preferably, the upper plate, a 'L'-shaped coupling protrusion that protrudes to the rear of the lower surface; and an upper elastic wedge formed by being cut in a '∩' shape toward the front; and the intermediate plate includes, a middle engaging piece supported by the 'b'-shaped coupling protrusion; and an intermediate wedge engaging hole for preventing the middle plate and the upper plate from being separated as the front end of the upper elastic wedge is caught and supported.

Preferably, the front portion of the hinge frame may be provided with a lumbar support.

Preferably, the lumbar support includes: upper and lower slide rails provided on the front part of the hinge frame; and a slide block fastened to the upper and lower slide rails to be slidable up and down, and a plurality of semi-moon-shaped recesses arranged to be connected to each other in the vertical direction are provided in the fastening portion of the slide block fastened to the slide rail. , The inner surface of the upper and lower slide rails are located in any one of the plurality of semi-moon shaped protrusions for fixing the slide block; may be provided with.

Preferably, elastic support wings supporting the user's lumbar spine may be hinged to both sides of the slide block so as to be rotatable left and right.

Preferably, a first hinge bushing for hinge coupling is integrally formed on both sides of the slide block, and a second hinge bushing for hinge coupling is integrally formed on the elastic support wing, and the first hinge bushing and the first hinge bushing are integrally formed. The two hinge bushings can be assembled to be positioned coaxially.

Preferably, a sector-shaped protrusion is integrally formed on an upper surface or a lower surface of the first hinge bushing, and a sector-shaped groove portion is integrally formed on a corresponding surface of the second hinge bushing corresponding to the sector-shaped protrusion, and the sector-shaped protrusion is integrally formed. The projection is assembled to be inserted into the sector-shaped groove, the formation angle of the sector-shaped groove is greater than the angle of formation of the sector-shaped projection, and the elastic support wing moves the sector-shaped projection within the sector-shaped groove. It is configured to be rotatable within a possible range, and an elastic member for maintaining the elastically rotated state of the elastic support wing toward the front side may be provided.

The present invention as described above has the advantage of being able to easily adjust the inclination of the back plate while having excellent assembly properties, and comfortably support the user's lumbar spine.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a perspective view showing an office chair according to an embodiment of the present invention.
Figure 2 is a side view showing an office chair according to an embodiment of the present invention.
3 and 4 are exploded perspective views illustrating a detailed configuration of a space adjusting unit of an office chair according to an embodiment of the present invention.
5 is an operational view illustrating a back plate inclination adjustment state of an office chair according to an embodiment of the present invention.
6 is a perspective view illustrating a seat plate portion of an office chair according to an embodiment of the present invention.
7 and 8 are exploded perspective views showing the seat plate of the office chair according to an embodiment of the present invention.
9 is a view showing an assembly process of the seat plate portion of the office chair according to an embodiment of the present invention.
10 is a cross-sectional view illustrating a cross-section of a seat plate portion of an office chair according to an embodiment of the present invention.
11 is a perspective view illustrating a lumbar support of an office chair according to an embodiment of the present invention.
12 is a perspective view showing an exploded state of the lumbar support of the office chair according to an embodiment of the present invention.
13 is an exploded perspective view showing the detailed configuration of the lumbar support of the office chair according to an embodiment of the present invention.
14 is an operation view showing an operating state of the lumbar support of the office chair according to an embodiment of the present invention.

The present invention may be embodied in various other forms without departing from its technical spirit or main characteristics. Accordingly, the embodiments of the present invention are merely illustrative in all respects and should not be construed as limiting.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms.

The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component.

and/or includes a combination of a plurality of items or any of a plurality of items.

When it is said that a component is 'connected' or 'connected' to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be

On the other hand, when it is mentioned that a certain element is 'directly connected' or 'directly connected' to another element, it should be understood that there is no other element in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as 'include' or 'comprising', 'having', etc. are intended to designate that a feature, number, step, operation, component, part, or a combination thereof described in the specification exists, but one It should be understood that it does not preclude the possibility of the presence or addition of or more other features or numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings, but the same or corresponding components are assigned the same reference numerals regardless of reference numerals, and redundant description thereof will be omitted.

In describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

An office chair according to an embodiment of the present invention, as shown in FIGS. 1 and 2 , includes a seat plate 10 , a back plate 20 , and a connection part 30 .

The seat plate part 10 is a part that supports the user's buttocks, the back plate part 20 is provided at the back of the seat plate part 10 and supports the user's back, and the connection part 30 is the It is a part connecting the lower part of the seat plate 10 and the rear part of the back plate 20 .

As shown in FIG. 4 , the back plate 20 includes a rectangular frame 21 and a hinge frame 23 extending upwardly from the lower portion of the rectangular frame 21 .

As shown in FIG. 2 , the connecting part 30 is composed of a seat plate bracket 31 connected to the seat plate part 10 and a back plate bracket 33 connected to the back plate part 20 are integrally assembled. do.

The office chair configured as described above has a function for adjusting the inclination of the back plate part 20, a function for adjusting the position by sliding the seat plate part 10 back and forth, and a function for supporting the lumbar spine of the user.

First, a function and configuration for adjusting the inclination of the backboard unit 20 will be described with reference to FIGS. 3 to 5 .

Hinge holes 23h are formed on both upper sides of the hinge frame 23 constituting the backboard part 20, and the hinge holes 23h on both upper sides of the backboard bracket 33 constituting the connection part 30. A reference hole 33h is formed at a position corresponding to Coaxial placement is possible.

The upper part of the hinge frame 23 and the upper part of the back plate bracket 33 are assembled in a state in which the hinge hole 23h and the reference hole 33h are coaxially arranged, specifically, the reference hole 33h The hinge frame 23 of the back plate part 20 is rotatably connected to the shaft rotation fastener 40 as a rotation axis by the shaft rotation fastener 40 that passes through and is fastened to the hinge hole 23h. and assembled

On the other hand, between the lower rear portion of the back panel portion 20 and the lower front portion of the back panel bracket 33 is provided with a gap adjusting unit ('100' in FIG. 2).

The interval adjusting unit 100 adjusts the distance between the lower rear portion of the back panel 20 and the lower front portion of the back panel bracket 33, and the back panel using the shaft rotation fastener 40 as a rotation axis. The amount of rotation of the hinge frame 23 of (20) is adjusted, and accordingly, the overall inclination of the backboard part 20 is adjusted.

The gap adjusting unit 100 for adjusting the inclination of the back plate 20 is a housing 110 comprising a gearbox housing 110a and a housing 110b on the other side assembled to the lower rear part of the back plate 20 . , a helical screw 121 protruding from the gearbox housing 110 toward the lower front portion of the back plate bracket 33 , shaft-coupled to the end of the helical screw 121 located inside the gearbox housing 110 . The first bevel gear 123, the second bevel gear 125 positioned inside the gearbox housing 110 to mesh with the first bevel gear 123, and the second bevel gear 125 are axially coupled. The lower side of the rotation handle 129 and the back plate bracket 33 provided at at least one end of the interval control rotation shaft 127 and the interval control rotation shaft 127 having an end extended to the outside of the gearbox housing 110 . It is assembled on the front part, and is configured to include a control block 130 in which a nut 131 screwed with the spiral screw 121 is built-in.

According to the configuration of the gap adjusting unit 100 as described above, as the user rotates the rotary knob 129 forward or reversely, the gap adjusting rotary shaft 127 and the second bevel gear 125 rotate together. Accordingly, the first bevel gear 123 meshed with the second bevel gear 125 is interlocked to rotate, and the helical screw 121 axially coupled to the first bevel gear 123 is interlocked. so that it rotates

As such, the spiral screw 121 is rotated in association with the rotation of the rotary knob 129, and the spiral screw 121 and the nut 131 built in the control block 130 are screwed to each other. As it operates, as shown in FIG. 5 , the distance between the lower rear part of the backboard part 20 and the lower front part of the backboard bracket 33 is adjusted to adjust the inclination of the backboard part 20 . have.

Next, a function and configuration for sliding the seat plate unit 10 back and forth will be described with reference to FIGS. 6 to 10 .

As shown in FIGS. 7 and 8, the seat plate part 10 is a lower plate 11 fixed to the upper part of the seat plate bracket 31 and is slidable back and forth with respect to the lower plate 11. A middle plate 13 fastened to the upper part of the lower plate, an upper plate 15 fixed to the upper part of the middle plate 13 and assembled, and a cushioning material 17 integrally attached to the upper surface of the upper plate 15 . is comprised of

As shown in FIGS. 7 and 8 , the intermediate plate 13 has a guide slot 13s extending in the front-rear direction and a rear end of the guide slot 13s than the width of the guide slot 13s. A plurality of insertion holes 13h formed with a wide width are formed, and preferably, four sets of the guide slots 13s and the insertion holes 13h are formed in a 2X2 arrangement.

The lower plate 11 is formed to have a width corresponding to the width of the guide slot 13s as shown in FIGS. 7 and 8 , and the width of the protruding piece 11a and the insertion hole 13h protruding upward. A plurality of locking pieces 11b formed on the upper end of the protruding pieces 11a are formed to have a width corresponding to , and four sets may be formed in a 2X2 arrangement.

Therefore, after the engaging piece 11b and the protruding piece 11a are inserted through the insertion hole 13h, the protruding piece 11a may be configured to slide in the front and rear directions along the guide slot 13s, As the protruding piece 11a slides back and forth along the guide slot 13s, the intermediate plate 13 can slide back and forth with respect to the lower plate 11, and is mounted on a separate position fixing means (not shown). By this, the position of the intermediate plate 13 may be positioned at an arbitrary position.

On the other hand, at a position where the protruding piece 11a slides in the front-rear direction along the guide slot 13s, the locking piece 11b is formed to have a width greater than that of the guide slot 13s. ) to prevent the intermediate plate 13 from being separated from the lower plate 11 (see FIG. 9(c)).

Meanwhile, while the protruding piece 11a is slid in the front-rear direction along the guide slot 13s, the intermediate plate as the engaging piece 11b and the protruding piece 11a are discharged through the insertion hole 13h. In order to prevent separation of (13) and the lower plate (11), an intermediate elastic wedge ('13a' in FIG. 8) provided on the intermediate plate 13 and a lower wedge engaging hole provided on the lower plate 11 (FIG. 7 of '11h') and a guide groove 11s.

Specifically, as shown in FIG. 9 , the intermediate elastic wedge 13a is cut and formed in a '∩' shape toward the front on the rear center side of the intermediate plate 13 .

Meanwhile, as shown in FIG. 9 , the lower wedge engaging hole 11h is formed at a position where the front end surface of the intermediate elastic wedge 13a can be caught and supported, and the guide groove 11s is the lower wedge. It is formed to extend backward from the locking hole 11h.

More specifically, as shown in (b) of FIG. 9 , in a state in which the engaging piece 11b is inserted into the insertion hole 13h, the lower end of the intermediate elastic wedge 13a is the upper portion of the lower plate 11 . is caught and elastically deformed, and as shown in (c) of FIG. 9 , in a state in which the protruding piece 11a slides along the guide slot 13s, the intermediate elastic wedge 13a returns to its original shape. is restored

On the other hand, as shown in (d) of FIG. 9, even if the intermediate plate 13 slides forward, the front end surface of the intermediate elastic wedge 13a is caught and supported by the lower wedge engaging hole 11h. Since the locking piece 11b is prevented from moving to a position where it is discharged from the insertion hole 13h, it is possible to prevent the intermediate plate 13 from being separated from the lower plate 11 .

The upper plate 15 is, as shown in FIGS. 8 and 10 , an 'L'-shaped coupling protrusion 15a that protrudes and extends to the rear of the lower surface and an upper elastic formed by incision in a '∩' shape toward the front. It is configured to include a wedge (15b).

The intermediate plate 13 is, as shown in FIGS. 7 and 10, a front end portion of the intermediate locking piece 13b and the upper elastic wedge 15b on which the 'L'-shaped coupling protrusion 15a is caught and supported. It is configured to include an intermediate wedge engaging hole 13c that prevents the middle plate 13 and the upper plate 15 from being separated as they are hung and supported.

Specifically, in a state where the upper plate 15 is positioned slightly in front of the intermediate plate 13, the upper plate 15 is slid backward and assembled to the intermediate plate 13, so that the 'b' A female-shaped engaging protrusion 15a is caught by the intermediate engaging piece 13b so that the upper plate 15 and the intermediate plate 13 are fastened to each other, and at the same time, the upper elastic wedge 15b is engaged with the intermediate wedge It is caught in the hole 13c to prevent the upper plate 15 and the middle plate 13 from being separated in the opposite direction to the assembly direction.

Specifically, before the upper plate 15 and the intermediate plate 13 are completely assembled, the upper elastic wedge 15b is in an upwardly deformed state so that the upper elastic wedge 15b engages the intermediate wedge engaging hole. It can be inserted into (13c), and after the upper plate 15 and the intermediate plate 13 are completely assembled, the end of the upper elastic wedge 15b is caught in the intermediate wedge engaging hole 13c. Separation of the upper plate 15 and the intermediate plate 13 in the opposite direction to the assembly direction is prevented.

According to the application of the coupling method of the lower plate 11, the middle plate 13 and the upper plate 15 as described above, quick and easy assembly is possible.

Next, a function and configuration for supporting the user's lumbar spine will be described with reference to FIGS. 11 to 14 .

As shown in FIG. 11 , a lumbar support 200 is provided on the front part of the hinge frame 23 , and as shown in FIG. 12 , the lumbar support 200 is the front surface of the hinge frame 23 . It is configured to include the upper and lower slide rails 210 provided in the unit and the slide blocks 220 that are fastened to the upper and lower slide rails 210 and are slidable up and down.

On the other hand, the fastening portion of the slide block 220 fastened to the upper and lower slide rails 210 is provided with a plurality of semi-moon-shaped recesses 220a arranged to be connected to each other in the vertical direction, and the inner surface of the upper and lower slide rails 210 is provided. A half-moon-shaped protrusion 210a for fixing the slide block 220 is provided on the side surface of the plurality of semi-moon-shaped concave grooves 220a.

Accordingly, the slide block 220 is slidable along the upper and lower slide rails 210 by the action of the plurality of semi-moon-shaped recesses 220a and the semi-moon shaped protrusions 210a, and stepwise positioning is possible.

On the other hand, on both sides of the slide block 220, the elastic support wings 230 for supporting the user's lumbar spine are hinged so as to be rotatable left and right.

In order to provide the elastic support wings 230 on both sides of the slide block 220, as shown in FIG. 13, first hinge bushings 220h for hinge coupling are provided on both sides of the slide block 220. It is integrally formed, and the second hinge bushing 230h for hinge coupling is integrally formed with the elastic support wing 230 .

The first hinge bushing 220h and the second hinge bushing 230h are assembled by the fastening pins P in a state in which they are positioned to be coaxial with each other.

On the other hand, the sector-shaped projection 220h-1 is integrally formed on the upper or lower surface of the first hinge bushing 220h, and the second hinge bushing 230h corresponding to the sector-shaped projection 220h-1 is formed. A sector-shaped groove portion 230h-1 is integrally formed on the corresponding surface, and the sector-shaped protrusion 220h-1 is assembled to be inserted into the sector-shaped groove portion 230h-1.

At this time, the formation angle of the sector-shaped groove portion 230h-1 is greater than that of the sector-shaped protrusion 220h-1. Accordingly, as shown in FIG. 14, the elastic support blade 230 ) is rotatable within the range in which the sector-shaped protrusion 220h-1 is movable within the sector-shaped groove portion 230h-1.

On the other hand, an elastic member 240 for maintaining the elastically rotated state of the elastic support wing 230 to the front side is provided.

In addition, an elastic locking piece 210b is provided on the upper portion of the upper and lower slide rails 210 to prevent the slide block 220 inserted therein from naturally falling out.

Although the present invention has been described mainly in terms of preferred embodiments with reference to the accompanying drawings, it will be apparent to those skilled in the art that many various and obvious modifications can be made therefrom without departing from the scope of the present invention. Accordingly, the scope of the present invention should be construed by the appended claims to cover many such modifications.

10: Seat plate 11: Lower plate
11a: protruding piece 11b: jamming piece
11h: lower wedge locking hole 13: middle plate
13a: middle elastic wedge 13b: middle hook piece
13c: Intermediate wedge locking hole 13h: Insertion hole
13s: guide slot 15: top plate
15a: 'b'-shaped coupling protrusion 15b: upper elastic wedge
17: cushion material 20: backing part
21: square frame 23: hinge frame
23h: hinge hole 30: connection part
31: seat bracket 33: back plate bracket
33h: reference hole 40: shaft rotation fastener
100: gap control unit 110: gear box housing
121: spiral screw 123: first bevel gear
125: second bevel gear 127: interval adjustment rotation shaft
129: rotary knob 130: adjustment block
131: nut 200: lumbar support
210: upper and lower slide rails 210a: half-moon protrusion
220: slide block 220a: half-moon groove
220h: first hinge bushing 220h-1: fan-shaped projection
230: elastic support wing 230h: second hinge bushing
230h-1: fan-shaped groove 240: elastic member

Claims (11)

As an office chair comprising a seat plate portion, a back plate portion, and a connection portion connecting the lower portion of the seat plate portion and the rear portion of the back plate portion,
The climbing part,
It is configured to include a rectangular frame and a hinge frame extending upwardly from the lower portion of the rectangular frame, and hinge holes are formed on both upper sides of the hinge frame,
The front part of the hinge frame is provided with a lumbar support, the lumbar support is,
upper and lower slide rails provided on the front part of the hinge frame; and a slide block that is fastened to the upper and lower slide rails and is slidable up and down.
The fastening portion of the slide block fastened to the slide rail is provided with a plurality of semi-moon-shaped grooves arranged to be connected to each other in the vertical direction, and located in any one of the plurality of semi-moon-shaped grooves on the inner surface of the upper and lower slide rails, the A semi-moon-shaped protrusion for fixing the slide block; is provided,
The seat plate is
a lower plate fixed to the upper part of the seat plate bracket and assembled; an intermediate plate fastened to the upper portion of the lower plate so as to be slid back and forth with respect to the lower plate; an upper plate fixed to the upper part of the intermediate plate and assembled; and a cushion material provided on the upper surface of the upper plate; and
The intermediate plate is
a plurality of guide slots extending in the front-rear direction; and an insertion hole formed at a rear end of the guide slot with a width wider than the width of the guide slot.
The lower plate is
a protruding piece formed with a width corresponding to the width of the guide slot and protruding upward; and a locking piece formed at a width corresponding to the width of the insertion hole and formed on the upper end of the protruding piece;
After the locking piece and the protruding piece are inserted through the insertion hole, the protruding piece is configured to slide in the front-rear direction along the guide slot, and the middle plate is prevented from being separated from the lower plate by the locking piece,
The intermediate plate is
It consists of including; an intermediate elastic wedge formed by incision in the shape of a '∩' toward the front;
The lower plate is
a lower wedge engaging hole through which the front end surface of the intermediate elastic wedge can be hung and supported; and a guide groove extending rearward from the lower wedge engaging hole;
In a state in which the engaging piece is inserted into the insertion hole, the lower end of the intermediate elastic wedge is caught on the upper part of the lower plate and elastically deformed upward,
In a state in which the protruding piece is slid along the guide slot, as the intermediate elastic wedge is restored to its original shape, the locking piece is prevented from moving to a position where it is discharged from the insertion hole, so that the intermediate plate is prevented from being separated from the lower plate. Features an office chair. According to claim 1,
An office chair, characterized in that hinged to both sides of the slide block so that elastic support wings for supporting the user's lumbar vertebrae are rotatable left and right. 3. The method of claim 2,
A first hinge bushing for hinge coupling is integrally formed on both sides of the slide block, and a second hinge bushing for hinge coupling is integrally formed on the elastic support wing, the first hinge bushing and the second hinge bushing Office chair, characterized in that it is assembled to be positioned coaxially. 4. The method of claim 3,
A sector-shaped protrusion is integrally formed on an upper surface or a lower surface of the first hinge bushing, and a sector-shaped groove portion is integrally formed on a corresponding surface of the second hinge bushing corresponding to the sector-shaped protrusion,
The sector-shaped projection is assembled to be inserted into the sector-shaped groove portion, the formation angle of the sector-shaped groove portion is formed larger than the formation angle of the sector-shaped projection,
The elastic support blade is configured to be rotatable within the range in which the sector-shaped protrusion is movable within the sector-shaped groove,
Office chair, characterized in that provided with an elastic member for maintaining the elastically rotated state of the elastic support wing to the front side. According to claim 1,
The connection part,
The seat plate bracket connected to the seat plate part and the back plate bracket connected to the back plate part are integrally assembled, and reference holes disposed corresponding to the hinge holes are formed on both upper sides of the back plate bracket,
and a shaft rotation fastener connecting the back plate part and the connection part so that the hinge hole and the reference hole are coaxially arranged,
By adjusting the distance between the lower rear portion of the backboard portion and the lower front portion of the backboard bracket, a gap adjusting portion for adjusting the inclination of the backboard portion based on the shaft rotation fastener is made of the lower rear portion of the backboard portion and the backboard bracket. Office chair, characterized in that provided between the lower front part. 6. The method of claim 5,
The interval adjusting unit,
a gearbox housing assembled to the lower rear portion of the back plate; a spiral screw protruding from the gearbox housing toward a lower front portion of the back plate bracket; and a control block assembled on the lower front part of the back plate bracket, and having a nut screwed therein to the spiral screw;
As the helical screw screwed to the nut rotates forward or backward, the interval between the lower rear portion of the back plate and the lower front portion of the back plate bracket is adjusted so that the inclination of the back plate is adjusted based on the shaft rotation fastener. Features an office chair. 7. The method of claim 6,
The interval adjusting unit,
a first bevel gear shaft-coupled to an end of the helical screw located inside the gearbox housing; a second bevel gear positioned inside the gearbox housing to mesh with the first bevel gear; The second bevel gear and the shaft-coupled end portion is extended to the outside of the gearbox housing, the interval adjustment rotation shaft; and a rotary knob provided at at least one end of the interval adjusting rotary shaft. delete delete delete According to claim 1,
The upper plate is
'B'-shaped coupling protrusion that protrudes backward on the lower surface; and an upper elastic wedge formed by incision in a '∩' shape toward the front;
The intermediate plate is
an intermediate engaging piece supported by the 'b'-shaped coupling protrusion; and an intermediate wedge engaging hole for preventing the middle plate and the upper plate from being separated as the front end of the upper elastic wedge is caught and supported.

Images