JP2001095640A - Chair with synchronizing operation mechanism of back seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair having a synchronously rocking mechanism of a back seat useful for a revolving chair mainly for an office which can effectively follow the action of a person sitting on the chair even with a simple structure, and is excellent in comfortableness in sitting and rationalized more greatly than a conventional article. SOLUTION: In a chair, a columnar member for supporting a back rest 8 is extended to the lower surface side of seat plates 6 and 14 as a lever member 7 urged to a side for inclining the back rest 8 forward by a spring body 9. The seat plates 6 and 14 have their front ends supported by a horizontal shaft 5 in the front part of a base member 2 attached to a leg support member 1 and their rear ends having a back seat synchronizing function supported by the lever member 7. The seat plates 6 and 14 have outer peripheral edges formed with high rigidity. The inner parts of the high rigidity parts are formed in sufficiently flexible parts. While the seat plates 6 and 14 are raised between the front part of the base member 2 and the upper part of the intermediate part of the lever member 7 in the high rigidity parts in the front and rear part thereof, they are supported by horizontal shafts 5 and 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair which has a simple structure and a comfortable sitting comfort and is provided with a locking mechanism, and is useful mainly as a swivel chair for office use.

[0002]

2. Description of the Related Art Conventionally, there are many chairs suitable for swivel chairs mainly for offices, which follow the movement of a occupant's body well and make it difficult for a long time to maintain a sitting posture to feel tired. Have been proposed and many of them have been put to practical use.

[0003] However, many of the conventional proposals which have been developed with the theme of following the behavior of a seated person well have been complicated in structure. In many cases, the chair does not work smoothly or is unnatural.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention has a simple structure, can follow the occupant's behavior well, has a good seating comfort, and has a conventional structure in terms of manufacturing and recycling. SUMMARY OF THE INVENTION It is an object of the present invention to provide a chair having a mechanism for synchronizing and locking a useful back seat, which is applied to a swivel chair for office use, which is greatly rationalized compared to a product.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a chair according to the present invention is provided with a lever member in which a columnar member supporting a backrest is biased by a spring body to a side for tilting the backrest forward. The front end of the seat plate is supported by a horizontal shaft in front of a base member attached to a leg support member, and the rear end side of the seat plate is connected to the lever. In a chair provided with a back seat synchro operation mechanism supported by a member, the seat plate has an outer peripheral edge formed with high rigidity, and the inside of the high rigid portion is formed with a sufficient flexible portion, The seat plate is supported by a horizontal shaft in a state where the seat plate is lifted in front of and behind the base member and above an intermediate portion of the lever member at high rigid portions.

In a more specific configuration of the chair according to the present invention, the columnar member supporting the backrest is extended to the lower surface side of the seat plate as a lever member biased by a spring body to the side for tilting the backrest forward. The seat plate has a back seat synchro operation mechanism in which a front end side is supported by a horizontal shaft in front of a base member attached to the leg support member, and a rear end side of the seat plate is supported by the lever member. In the chair, the support portion of the seat plate is formed as an upward portion inclined forward in the front of the base member, and a first horizontal axis movable at a front end of the upward portion in the front-rear direction of the seat plate. On the other hand, by providing a second horizontal shaft on the lever member at a position corresponding to the rear end side of the seat plate, the seat plate support portion is formed above the base member so as to be spaced apart from the base member. Seat mounted on the seat support An inner shell formed along the outer shape of a plastic or metal seat plate, wherein the outer periphery of the shell is provided with ribs or is thickened with the ribs to increase the rigidity of the outer peripheral edge. And the inner side is provided with slits of an appropriate pattern in the shell body, or the slit arrangement and the thickness of the shell body are made thin to be easily bent, and the shell body is formed. Before and after the back surface, a bearing portion for holding the two shafts of the seat plate support portion is formed, and the seat plate is provided with a horizontal portion of the seat plate support portion in the bearing portion of the inner shell body. It is characterized by being held and held.

In the chair according to the present invention, the seat plate has
The inner shell body itself may be configured to also serve as the cushion material and the outer skin material, or the inner shell body may be configured to cover the surface side with the outer skin material of the cushion material,
You can choose any. In this case, the outer skin material and the cushion material can be formed into a type that is shared by one member, such as foamed plastic.

In the chair of the present invention, the back surface of the inner shell of the seat plate is separated from the upper surface of the base member in which the spring member and the lever member are accommodated, so that the separated portion is shielded. Therefore, a skirt member can be provided vertically on the back surface of the shell body corresponding to the outer wall of the base member. In this case, the skirt portion is arranged in a row along a slit-like minute gap in the longitudinal direction of the shell (in the longitudinal direction of the seat plate) so as not to hinder the pending operation of the shell. It is desirable.

Further, the bearing portion of the inner shell body of the seat is formed in a substantially inverted U-shape with respect to the two front and rear horizontal shafts and a U-shape in the horizontal direction so that attachment and detachment with respect to the shaft can be relatively easily performed. In addition, a lock mechanism is formed to allow rotation of each shaft, and a lock mechanism that does not disengage the fitted shaft is formed with a bar member receiver on the back surface of the shell body with the shaft interposed, and a bar member is inserted there. It forms by doing.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a chair according to an embodiment of the present invention. FIG. 1 is an exploded perspective view showing an example of the structure of the chair of the present invention, FIG. 2 is a side sectional view of the chair of the present invention with a part thereof omitted, and FIG. FIG. 4 is a side sectional view of the chair in the state where the board is most sunk, FIG. 4 is a perspective view of the seat plate of the chair of FIGS.
FIG. 7 is a plan view showing an example of a pattern of slits provided in the inner shell body of the seat plate, and FIG. 8 is an enlarged cross-sectional view of a lock mechanism of the bearing.

1 to 3, reference numeral 1 denotes a lower leg side of a star-shaped or star-shaped radial leg 1a with a caster, and a leg post of a chair having a built-in gas spring 1b. A base member having a substantially box-like shape having a rear side attached to the upper end of the base member and having an open upper surface. The left and right sides are formed with bracket portions 3 protruding in a tongue shape. Reference numeral 4 denotes a horizontally elongated hole formed at an upper portion of the bracket portion 3, and a first horizontal shaft 5 for supporting a front portion of a seat plate 6 described later is erected in the elongated hole 4 in the left and right bracket portions 3 so as to be movable back and forth. ing.

7 is substantially L-shaped when viewed from the side (FIGS. 1 to 3).
This is a lever member for supporting the back of the backrest and the rear of the back of the seat plate.
Supports the backrest 8 from the back, and the lateral member 7b
The back of the is supported from below.

The lever member 7 has a spring pressing portion 7c which has a tip portion hanging downward and presses a rear end portion of a coil spring 9 provided as an example of a spring body. A bearing portion formed in an upward bracket shape integrally with a side wall closer to the rear than the middle of the base member 2
2a is pivoted by an axis 10 parallel to the first horizontal axis 5. Here, the pivoting position of the shaft 10 is set at the length of the lever member 7 and the bearing portion 2a so as to be located forward of the position of the leg support 1.
Is set.

The spring 9 is arranged inside the base member 2 such that the spring stopper block 11 at the rear end thereof is brought into contact with the spring pressing portion 7c, while the front end is supported by the spring receiving block 12. By being provided, the lever member 7 is provided.
1 and 2 around the shaft 10 in the clockwise direction in FIGS. 1 and 2 to provide a resilient force on the spring pressing portion 7c to cushion the angular turning operation of the lever member. do.

The spring receiving block 12 is divided into two parts at the front and rear so as to be in contact with each other on inclined surfaces 12a, and a front block 12b is provided with a threaded rod 12c provided through the base member 2.
The block 12d on the rear side is moved forward and backward with respect to the spring 9 by rotating the block 9 to move it up and down, so that the repulsive force of the spring 9 can be adjusted. 12e is a knob for turning the screw rod 12c.

Reference numeral 13 denotes a second horizontal shaft provided at an intermediate portion of the horizontal member 7b of the lever member 7 corresponding to the rear end of the seat plate 6, and the left and right sides of the second horizontal shaft 13 are lever members in the illustrated example. The shaft 13 bent so as to be separated from the upper surface of the shaft 7 is used. In the present invention, although not shown, the lever member 7
An upward bracket may be provided on the upper surface of the horizontal member 7b, and a straight second horizontal shaft 13 may be installed on the bracket.

The above-described members from the leg support 1 to the second horizontal axis 13 constitute an example of a locking mechanism for the back seat of the chair of the present invention to perform a synchronizing operation. In FIG. 1, reference numeral 20 denotes a transverse member 7b. The provided armrest mounting seat portion, 21 is an armrest, and 22 and 23 are undercovers attached to the base member 2, the transverse member 7b, and the mounting seat portion 20 from the lower surface side.

Next, details of the seat plate 6 and the backrest 8 supported by the locking mechanism will be described. Seat plate 6
The inner shell body 14 of the seat, as schematically shown in FIG.
Here, it is formed of a cushion material 6b covered with an outer skin 6a attached on the shell 14. The inner shell body 14 of the seat is provided with ribs 14b at required portions on the back surface to increase the rigidity of the outer peripheral portion 14a or to increase the thickness of the outer peripheral edge, while easily bending the central portion of the seat surface. The slit 14c is provided or the thickness of the portion is reduced. The slit 14c may be formed by using the pattern shown in FIG. 5, the pattern shown in FIGS. 6 and 7, or another pattern.

Reference numerals 15 and 16 denote bearing portions of the two horizontal shafts 5 and 13, respectively, which are formed to protrude downward at the front and rear portions of the back surface of the shell body 14. In the front bearing portion 15, a groove 15a for receiving the first horizontal shaft 5 is formed horizontally (horizontally), and in the rear bearing portion 16, a groove 16a for receiving the second horizontal shaft is formed downward (vertically). In order to prevent the shaft 13 fitted in the groove 16a from coming off as shown in an enlarged view in FIG.
b and 16c are provided with the groove 16a interposed therebetween. When the shaft 13 is fitted into the groove 16a, the bar member 17 is inserted into the receiving portions 16b and 16c so that the shaft 13 in the groove 16a can be pressed from below. ing.

As shown in FIG. 2, the seat plate 6 having the above-described structure is supported on the front and rear shafts 5 and 13 so that the bearing portions 15 and 16 are disposed above the base member 2 in which the locking mechanism is housed. , Will be supported in a floating state. In the present invention,
In order to prevent a hand or the like from being inserted into the space between the lower surface of the inner shell body 14 of the seat plate 6 and the upper surface of the base member 2, the lower surface of the inner shell body 14 At positions corresponding to the left and right side surfaces, a skirt member 14d for shielding the space is provided integrally with the inner shell body 14. This skirt member 14d does not impair the flexibility of the inner shell body 14 of the seat,
Here, a form in which a plurality of slits are arranged is adopted. Reference numeral 14e is a fastener member for fixing the periphery of the outer skin 6a covering the cushion material 6b attached to the upper surface of the inner shell body 14 of the seat to a groove formed on the outer periphery 14a of the back surface of the shell body 14. .

Next, the structure of the backrest 8 shown in the figure is composed of a back inner shell body 18 mounted on the front surface of the vertical member 7a of the lever member 7, and a shell body covered by the outer skin 8a.
It comprises a cushion member 8b attached to the front surface of the outer shell 18 and an outer shell 19 applied to the back side of the vertical member 7a and connected to the rear surface of the inner shell body 18.

In the vertical member 7a of the lever member 7, two pipe-shaped members 7a, 7a are erected in parallel, and the two members 7a, 7a are connected by horizontal connecting members 7d, 7e here. It is integrated. The inner shell body 18 of the back has an inverted concave fitting portion 18a formed on the upper surface of the back surface to cover the upper ends of the two vertically-oriented members 7a, and is locked from above by the coupling member 7e at an intermediate portion. A hook-shaped locking piece 18b is formed.

On the other hand, on the inner surface of the outer shell 19 on the back, locking pieces 19a and 19b are formed on the connecting members 7d and 7e of the vertical member 7a and locked on the lower side. A plurality of female members 18c and a male member 19c are provided at a plurality of positions facing the outer periphery of the inner shell body 18 and the back surface of the inner shell body 18 and the inner surface of the outer shell 19. 1
By the connection of 9c, these two shells 18, 19 are connected and integrated without using a screw or the like, thereby forming the backrest 8 of the chair of the present invention.

[0024]

The chair according to the present invention is as described above, wherein the columnar member supporting the backrest is extended to the lower surface side of the seat plate as a lever member which is biased by the spring body to the forwardly inclined side of the backrest. The seat plate has a back seat synchro operation mechanism in which a front end side is supported by a horizontal shaft in front of a base member attached to the leg support member, and a rear end side of the seat plate is supported by the lever member. In the chair, the seat plate has an outer peripheral edge formed with high rigidity, the inside of the high rigid portion is formed with a sufficiently flexible portion, and the seat plate is formed with the base at the front and rear high rigid portions. It is supported by the horizontal shaft in a state where it is lifted in front of the member and above the middle part of the lever member, so that a good seating comfort of the seat plate can be realized with a simple structure, and setting and adjustment of the wearing comfort at the manufacturing stage Large amount of time and effort Without requiring changes, there is an advantage that it can be relatively easy.

In addition, the support portion of the seat plate having the above-described structure is formed in an upward portion inclined forward in the front of the base member, and is movable in the front-rear direction of the seat plate at the tip of the upward portion. The first horizontal axis is provided while the second horizontal axis is provided on the lever member at a position corresponding to the rear end side of the seat plate, thereby separating the seat plate support portion above the base member. The seat plate mounted on the seat plate supporting portion is an inner shell body having a shape along the outer shape of a plastic plate or a metal plate, and the outer peripheral portion of the shell body has ribs. Or the ribs are thickened together with the ribs to increase the rigidity of the outer peripheral edge, and the inner side is provided with slits of an appropriate pattern in the shell body, or the slit arrangement and the shell body The thickness of the shell body is made thin and easy to bend. Before and after the surface, since the structure in which a bearing portion for holding the two axes of the seat support part,
It is possible to assemble the backrest and the seat plate without using any fasteners such as screws, and also to use the fasteners such as screws for mounting the backrest and the backboard on the chair body. There is an advantage that tools such as a driver are not required for assembling a chair or replacing a backrest seat plate.

Further, even with a locking mechanism having a simple structure, the shape of the inner shell body of the seat is devised so as to complement the comfort of the locking by the action of the locking mechanism. It is possible to obtain the sensation of the feeling of comfort almost inferior to the comfort of the chair of the rocking mechanism.

In addition, when the chair of the present invention is completely used up and discarded, or when the seat plate or the backrest is replaced, the backrest or the seat plate can be easily removed from the frame body without using a tool. And in terms of recycling,
It does not take time and effort.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing the structure of an example of the chair of the present invention.

FIG. 2 is a side sectional view in which a part of an example of the chair according to the present invention is omitted.

3 is a side cross-sectional view of the chair of FIG. 2 with the backrest tilted most backwards and the seat plate lowered most;

FIG. 4 is a perspective view of the seat plate of the chair of FIGS. 1 and 2 as viewed from the back side.

FIG. 5 is a plan view showing a first example of a slit pattern provided on an inner shell body of a seat plate.

FIG. 6 is a plan view showing a second example of the slit pattern provided on the inner shell body of the seat plate.

FIG. 7 is a plan view showing a third example of a slit pattern provided on the inner shell body of the seat plate.

FIG. 8 is an enlarged sectional view of a lock mechanism of the bearing unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Leg support 2 Base member 3 Bracket part 4 Horizontal long hole 5 First horizontal axis 6 Seat plate 7 Lever member 8 Backrest 9 Coil spring 10 Axis 11 Spring stopper block 12 Spring receiving block 13 Second horizontal axis 14 Seat inner shell 15 , 16 Bearing part 17 Bar member 18 Inner shell 19 Outer shell

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[Procedure amendment]

[Submission date] August 21, 2000 (2008.2
1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Chair with back seat synchro operation mechanism

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair which has a simple structure and a comfortable sitting comfort and is provided with a locking mechanism, and is useful mainly as a swivel chair for office use.

[0002]

2. Description of the Related Art Conventionally, there are many chairs suitable for swivel chairs mainly for offices, which follow the movement of a occupant's body well and make it difficult for a long time to maintain a sitting posture to feel tired. Have been proposed and many of them have been put to practical use.

[0003] However, many of the conventional proposals which have been developed with the theme of following the behavior of a seated person well have been complicated in structure. In many cases, the chair does not work smoothly or is unnatural.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention has a simple structure, can follow the occupant's behavior well, has a good seating comfort, and has a conventional structure in terms of manufacturing and recycling. SUMMARY OF THE INVENTION It is an object of the present invention to provide a chair having a mechanism for synchronizing and locking a useful back seat, which is applied to a swivel chair for office use, which is greatly rationalized compared to a product.

[0005]

In order to solve the above-mentioned problems, the chair according to the present invention has a configuration in which the lower extension of the columnar lever member supporting the backrest is moved by the compression repulsive force of the spring body. As a spring pressing portion for urging the front plate to lean forward, it is pivotally mounted on a lower surface side of a seat plate to a base member attached to a leg support member, while the seat plate is in front of the base member. In a chair provided with a back seat synchro operation mechanism in which a front end side is supported by a horizontal shaft and a rear end side of the seat plate is supported by the lever member, the seat plate has an outer peripheral edge formed with high rigidity. At the same time, the inside of the high-rigidity portion is formed as a sufficiently flexible portion, and the seat plate is lifted in front and behind the high-rigidity portion above the front of the base member and above the intermediate portion of the lever member extension. It is characterized in that is supported by a horizontal shaft.

[0006] A more specific configuration of the chair according to the present invention is that a downwardly extending portion of the columnar lever member supporting the backrest is provided with a spring pressing portion for urging the backrest to the side inclining forward by the compression repulsion of the spring body. The lower end of the seat plate is pivotally attached to a base member attached to the leg support member, while the front end of the seat plate is supported by a horizontal shaft in front of the base member and the seat plate is In a chair provided with a back seat synchro operation mechanism in which a rear end side is supported by the lever member, the support portion of the seat plate is formed as an upward portion in which the front of the base member is inclined upward.
A first horizontal shaft movable in the front-rear direction of the seat plate is provided at a front end of the upward portion, and a second horizontal shaft is provided on the lever member extension and at a position corresponding to a rear end side of the seat plate. By providing the shaft, the seat plate support portion is formed above the base member so as to be spaced apart from the base member, and the seat plate mounted on the seat plate support portion follows the outer shape of the plastic or metal plate seat plate. The outer shell of the inner shell body is provided with ribs or formed with a thicker wall together with the ribs to increase the rigidity of the outer peripheral edge, and the inner side is appropriately patterned on the shell body. Or the slit arrangement and the thickness of the shell body are reduced and formed so as to be easily bent, and the two shafts of the seat plate supporting portion are provided before and after the back surface of the shell body. And a bearing portion for holding the seat plate. It is characterized in that attached by holding the horizontal axis of the seat support part in the receiving part.

In the chair according to the present invention, the seat plate has
The inner shell body itself may be configured to also serve as the cushion material and the outer skin material, or the inner shell body may be configured to cover the surface side with the outer skin material of the cushion material,
You can choose any. In this case, the outer skin material and the cushion material can be formed into a type that is shared by one member, such as foamed plastic.

In the chair according to the present invention, the back surface of the inner shell body of the seat plate is separated from the upper surface of the base member in which the spring body and the lever member are housed. Therefore, a skirt member can be provided vertically on the back surface of the shell body corresponding to the outer wall of the base member. In this case, the skirt portion is arranged in a row along a slit-like minute gap in the longitudinal direction of the shell (in the longitudinal direction of the seat plate) so as not to hinder the pending operation of the shell. It is desirable.

Further, the bearing portion of the inner shell body of the seat is formed in a substantially inverted U-shape with respect to the two front and rear horizontal shafts and a U-shape in the horizontal direction so that attachment and detachment with respect to the shaft can be relatively easily performed. In addition, a lock mechanism is formed to allow rotation of each shaft, and a lock mechanism that does not disengage the fitted shaft is formed with a bar member receiver on the back surface of the shell body with the shaft interposed, and a bar member is inserted there. It forms by doing.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a chair according to an embodiment of the present invention. FIG. 1 is an exploded perspective view showing an example of the structure of the chair of the present invention, FIG. 2 is a side sectional view of the chair of the present invention with a part thereof omitted, and FIG. FIG. 4 is a side sectional view of the chair in the state where the board is most sunk, FIG. 4 is a perspective view of the seat plate of the chair of FIGS.
FIG. 7 is a plan view showing an example of a pattern of slits provided in the inner shell body of the seat plate, and FIG. 8 is an enlarged cross-sectional view of a lock mechanism of the bearing.

1 to 3, reference numeral 1 denotes a lower leg side of a star-shaped or star-shaped radial leg 1a with a caster, and a leg post of a chair having a built-in gas spring 1b. A base member having a substantially box-like shape having a rear side attached to the upper end of the base member and having an open upper surface. The left and right sides are formed with bracket portions 3 protruding in a tongue shape. Reference numeral 4 denotes a horizontally elongated hole formed at an upper portion of the bracket portion 3, and a first horizontal shaft 5 for supporting a front portion of a seat plate 6 described later is erected in the elongated hole 4 in the left and right bracket portions 3 so as to be able to move back and forth. ing.

7 is substantially L-shaped when viewed from the side (FIGS. 1 to 3).
In the lever member for supporting the back of the backrest and the rear of the back of the seat plate, the vertical member 7a as a columnar lever member supports the backrest 8 from the back,
As an extension thereof, a lateral member 7b supports the rear portion of the seat plate 6 from below.

The lever member 7 has a spring pressing portion 7c which has a tip portion hanging downward and presses a rear end portion of a coil spring 9 provided as an example of a spring body. A bearing portion formed in an upward bracket shape integrally with a side wall closer to the rear than the middle of the base member 2
2a is pivoted by an axis 10 parallel to the first horizontal axis 5. Here, the pivoting position of the shaft 10 is set at the length of the lever member 7 and the bearing portion 2a so as to be located forward of the position of the leg support 1.
Is set.

The spring 9 is arranged inside the base member 2 such that the spring stopper block 11 at the rear end thereof is brought into contact with the spring pressing portion 7c, while the front end is supported by the spring receiving block 12. By being provided, the lever member 7 is provided.
1 and 2 around the shaft 10 in the clockwise direction in FIGS. 1 and 2 to provide a resilient force on the spring pressing portion 7c to cushion the angular turning operation of the lever member. do.

The spring receiving block 12 is divided into two parts at the front and rear so as to be in contact with each other on inclined surfaces 12a, and a front block 12b is provided with a threaded rod 12c provided through the base member 2.
The block 12d on the rear side is moved forward and backward with respect to the spring 9 by rotating the block 9 to move it up and down, so that the repulsive force of the spring 9 can be adjusted. 12e is a knob for turning the screw rod 12c.

Reference numeral 13 denotes a second horizontal shaft provided at an intermediate portion of the horizontal member 7b of the lever member 7 corresponding to the rear end of the seat plate 6, and the left and right sides of the second horizontal shaft 13 are lever members in the illustrated example. The shaft 13 bent so as to be separated from the upper surface of the shaft 7 is used. In the present invention, although not shown, the lever member 7
An upward bracket may be provided on the upper surface of the horizontal member 7b, and a straight second horizontal shaft 13 may be installed on the bracket.

The above-described members from the leg support 1 to the second horizontal axis 13 constitute an example of a locking mechanism for the back seat of the chair of the present invention to perform a synchronizing operation. In FIG. 1, reference numeral 20 denotes a transverse member 7b. The provided armrest mounting seat portion, 21 is an armrest, and 22 and 23 are undercovers attached to the base member 2, the transverse member 7b, and the mounting seat portion 20 from the lower surface side.

Next, details of the seat plate 6 and the backrest 8 supported by the locking mechanism will be described. Seat plate 6
The inner shell body 14 of the seat, as schematically shown in FIG.
Here, it is formed of a cushion material 6b covered with an outer skin 6a attached on the shell 14. The inner shell body 14 of the seat is provided with ribs 14b at required portions on the back surface in order to increase the rigidity of the outer peripheral portion 14a or to increase the thickness of the outer peripheral edge, while easily bending the central portion of the seat surface. The slit 14c is provided or the thickness of the portion is reduced. The slit 14c may be arbitrarily formed by the pattern shown in FIG. 5, the pattern shown in FIGS. 6 and 7, or another pattern.

Reference numerals 15 and 16 denote bearing portions of the two horizontal shafts 5 and 13, respectively, which are formed to protrude downward at the front and rear portions of the back surface of the shell body 14. In the front bearing portion 15, a groove 15a for receiving the first horizontal shaft 5 is formed horizontally (horizontally), and in the rear bearing portion 16, a groove 16a for receiving the second horizontal shaft is formed downward (vertically). In order to prevent the shaft 13 fitted in the groove 16a from coming off as shown in an enlarged view in FIG.
b and 16c are provided with the groove 16a interposed therebetween. When the shaft 13 is fitted into the groove 16a, the bar member 17 is inserted into the receiving portions 16b and 16c so that the shaft 13 in the groove 16a can be pressed from below. ing.

As shown in FIG. 2, the seat plate 6 having the above-described structure is supported on the front and rear shafts 5 and 13 so that the bearing portions 15 and 16 are disposed above the base member 2 in which the locking mechanism is housed. , Will be supported in a floating state. In the present invention,
In order to prevent a hand or the like from being inserted into the space between the lower surface of the inner shell body 14 of the seat plate 6 and the upper surface of the base member 2, the lower surface of the inner shell body 14 At positions corresponding to the left and right side surfaces, a skirt member 14d for shielding the space is provided integrally with the inner shell body 14. This skirt member 14d does not impair the flexibility of the inner shell body 14 of the seat,
Here, a form in which a plurality of slits are arranged is adopted. Reference numeral 14e is a fastener member for fixing the peripheral edge of the outer skin 6a covering the cushion material 6b attached to the upper surface of the inner shell body 14 of the seat to the groove formed on the outer periphery 14a of the back surface of the shell body 14. .

Next, the structure of the backrest 8 shown in the figure is composed of a back inner shell body 18 mounted on the front surface of the vertical member 7a of the lever member 7, and a shell body covered by the outer skin 8a.
It comprises a cushion member 8b attached to the front surface of the outer shell 18 and an outer shell 19 applied to the back side of the vertical member 7a and connected to the rear surface of the inner shell body 18.

In the vertical member 7a of the lever member 7, two pipe-shaped members 7a, 7a are erected in parallel, and the two members 7a, 7a are connected by horizontal connecting members 7d, 7e here. It is integrated. The inner shell body 18 of the back has an inverted concave fitting portion 18a formed on the upper surface of the back surface to cover the upper ends of the two vertically-oriented members 7a, and is locked from above by the coupling member 7e at an intermediate portion. A hook-shaped locking piece 18b is formed.

On the other hand, on the inner surface of the outer shell 19 on the back, locking pieces 19a and 19b are formed on the connecting members 7d and 7e of the vertical member 7a and locked on the lower side. A plurality of female members 18c and a male member 19c are provided at a plurality of positions facing the outer periphery of the inner shell body 18 and the back surface of the inner shell body 18 and the inner surface of the outer shell 19. 1
By the connection of 9c, these two shells 18, 19 are connected and integrated without using a screw or the like, thereby forming the backrest 8 of the chair of the present invention.

[0024]

The chair according to the present invention is as described above, and the lower extension of the columnar lever member supporting the backrest urges the backrest forward by the compression repulsion force of the spring body. As a pushing portion, the lower end of the seat plate is pivotally attached to a base member attached to the leg support member, while the seat plate is supported at the front end side by a horizontal shaft in front of the base member, and In a chair provided with a back seat synchro operation mechanism in which a rear end side of a seat plate is supported by the lever member, the seat plate has an outer peripheral edge formed with high rigidity, and the inside of the high rigidity portion has a sufficient rigidity. Since the seat plate is formed in a flexible portion and is supported by the horizontal shaft in a state where the seat plate is lifted in front of the base member and above the intermediate portion in the lever member extension portion in the front and rear high rigidity portions, Good hanging Guests can realize comfortable with a simple structure, without requiring wearing comfort setting and adjustment extensive labor and design changes at the manufacturing stage, there is an advantage that it can be relatively easy.

Further, the support portion of the seat plate having the above-mentioned structure is formed in an upward portion inclined forward in the front of the base member, and is movable in the front-rear direction of the seat plate at the tip of the upward portion. The first horizontal axis is provided, while the second horizontal axis is provided at a position on the lever member extension corresponding to the rear end side of the seat plate, thereby separating the seat plate support portion above the base member. The seat plate mounted on the seat plate supporting portion is an inner shell body having a shape along the outer shape of a plastic or metal plate seat plate, and an outer peripheral portion of the shell body is a rib. Or the ribs are thickened together with the ribs to increase the rigidity of the outer peripheral edge, and the inner side is provided with slits of an appropriate pattern in the shell body, or the slit arrangement and the shell body The thickness of the shell body is made thin and easy to bend. Before and after the surface, since the structure in which a bearing portion for holding the two axes of the seat support part,
It is possible to assemble the backrest and the seat plate without using any fasteners such as screws, and also to use the fasteners such as screws for mounting the backrest and the backboard on the chair body. There is an advantage that tools such as a driver are not required for assembling a chair or replacing a backrest seat plate.

Further, even with a locking mechanism having a simple structure, the shape of the inner shell body of the seat is devised so as to complement the comfort of the locking by the action of the locking mechanism. It is possible to obtain the sensation of the feeling of comfort almost inferior to the comfort of the chair of the rocking mechanism.

In addition, when the chair of the present invention is completely used up and discarded, or when the seat plate or the backrest is replaced, the backrest or the seat plate can be easily removed from the frame body without using a tool. And in terms of recycling,
It does not take time and effort.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing the structure of an example of the chair of the present invention.

FIG. 2 is a side sectional view in which a part of an example of the chair according to the present invention is omitted.

3 is a side cross-sectional view of the chair of FIG. 2 with the backrest tilted most backwards and the seat plate lowered most;

FIG. 4 is a perspective view of the seat plate of the chair of FIGS. 1 and 2 as viewed from the back side.

FIG. 5 is a plan view showing a first example of a slit pattern provided on an inner shell body of a seat plate.

FIG. 6 is a plan view showing a second example of the slit pattern provided on the inner shell body of the seat plate.

FIG. 7 is a plan view showing a third example of a slit pattern provided on the inner shell body of the seat plate.

FIG. 8 is an enlarged sectional view of a lock mechanism of the bearing unit.

[Description of Signs] 1 leg post 2 base member 3 bracket 4 laterally long hole 5 first horizontal axis 6 seat plate 7 lever member 8 backrest 9 coil spring 10 axis 11 spring stopper block 12 spring receiving block 13 second horizontal axis 14 Seat Inner shell 15, 16 Bearing 17 Bar member 18 Inner shell 19 Outer shell

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Noboru Inoue 3-5-6 Minamiazabu, Minato-ku, Tokyo Inside Inoue Associates Co., Ltd. (72) Inventor Hideo Okamura 2-49-15 Kodai, Adachi-ku, Tokyo Shares Toyo Kogei Co., Ltd. (72) Inventor Akio Goto 2-49-15 Kodai, Adachi-ku, Tokyo Toyo Kogei Co., Ltd. (72) Shinichi Okubo 2-49-15 Kodai, Adachi-ku, Tokyo Co., Ltd. Toyo Kogei Co., Ltd. (72) Inventor Tatsuo Iwatsuki 1-6-11 Awajicho, Chuo-ku, Osaka-shi, Osaka F-term (reference) 3B091 AA04 AB03 AC05

Claims (5)

[Claims] 1. A column member supporting a backrest is extended to a lower surface side of a seat plate as a lever member urged to a side for tilting the back forward by a spring body, while the seat plate is a leg support member. A chair provided with a back seat synchro operation mechanism in which a front end side is supported by a horizontal shaft in front of a base member attached to the base member and a rear end side of the seat plate is supported by the lever member; While forming the outer peripheral edge with high rigidity,
The inside of the high-rigidity portion is formed as a sufficiently flexible portion, and the seat plate is supported by the horizontal shaft in a state where the seat plate is lifted in front of and behind the base member and above the intermediate portion of the lever member at the high-rigidity portions. A chair with a back seat synchro operation mechanism, characterized by being made to work. 2. A column member supporting the backrest is extended to a lower surface side of the seat plate as a lever member biased to a side for tilting the back forward by a spring body, while the seat plate is a leg support member. A chair provided with a back-seat synchro operation mechanism in which a front end side is supported by a horizontal shaft in front of a base member attached to the base member and a rear end side of the seat plate is supported by the lever member; Is formed in an upward portion in which the front of the base member is inclined upward, and a first horizontal axis movable in the front-rear direction of the seat plate is provided at the tip of the upward portion, while The second horizontal shaft is provided at a position corresponding to the rear end side of the seat plate, so that the seat plate support portion is formed above the base member so as to be separated therefrom, and is mounted on the seat plate support portion. Seat plate is made of plastic plate or metal The outer shell of the inner shell body is provided with ribs or thickened together with the ribs to increase the rigidity of the outer peripheral edge, and the inner shell body is formed along the outer shape of the seat plate made of The side is provided with a slit of an appropriate pattern in the shell body, or the slit arrangement and the thickness of the shell body are made thin so as to be easily bent, and the seat is disposed before and after the back surface of the shell body. A bearing portion for holding the two shafts of the plate support portion, wherein the seat plate is mounted by holding the horizontal axis of the seat plate support portion in the bearing portion of the inner shell body. A chair with a backseat synchronization mechanism. 3. The chair according to claim 1, wherein the seat plate has a structure in which the cushion material and the outer skin material are used by themselves, or a structure in which a surface side of the cushion material is covered with the outer skin material. 4. The back surface of the shell body corresponding to the outer wall of the base member for shielding between the back surface of the inner shell body of the seat plate and the upper surface of the base member in which the spring body and the lever member are accommodated. The skirt member is vertically provided on the skirt.
Chair. 5. The bearing portion of the seat inner shell body is formed in a substantially inverted U-shape and a horizontal U-shape with respect to two front and rear horizontal shafts, and a locking mechanism for preventing the fitted shaft from being detached.
Form a bar member receiver on the back surface of the shell body with the shaft interposed,
Claim 2 formed by inserting a bar member there.
Any of the chairs in 4.