KR20110084241A - Chair - Google Patents

Abstract

It is possible to reliably prevent the chair back support rods from contacting with other objects when turning the chair, for example, to damage them or to damage the chair back support rods themselves, while reducing the number of parts, and the structure is simple and easy. Provide a chair to assemble. In the support base 5 which is supported by the leg body 3 and supports the sheet 7, an upright portion 9a facing upwards and a forwardly facing portion 9b facing forward are provided through the bent portion 9c. Attached to all of the turning part 9b in the chair back support rod 9 which is almost L-shaped when viewed from the side, and connected to each other, the chair back 6 is supported by the standing part 9a. In the chair comprised, the protective cover 11 covers the part from the back surface of the bend part 9c to the lower surface in the chair back support rod 9 at least.

Description

Chair {CHAIR}

The present invention relates to a chair having an almost L shape when viewed from the side of the chair back support rod.

In a conventional chair having a chair back support rod having a substantially L shape as viewed from the side, in which a standing upright portion and a forward facing portion are connected to each other via a bent portion, the back support rod, ie the chair In order to prevent the back support rods from touching the other objects and damaging them or damaging the back rods themselves, some of the back and outer surfaces of the back support rods are covered by a cover made of soft material (for example , Patent Document 1).

In addition, there is a case where the joint portion of the leg frame and the back frame is covered with a joint cover for allowing two cover portions to be opened and closed with each other through the hinge portion (see Patent Document 2, for example). .

Patent Document 1: Japanese Unexamined Patent Publication No. 2002-136388

Patent Document 2: Japanese Unexamined Patent Publication No. 2000-14478

However, in what is described in patent document 1, the lower surface of the conversion part in a chair back support rod contacts the upper surface edge part of the mounting material on the floor of a low position, and damages it, or the back rod itself is There is a risk of damage, and a cover must be attached to each of the pair of left and right chair back support rods, which increases the number of parts and makes the attaching work cumbersome.

In what is described in patent document 2, the structure of the cover itself becomes complicated, and manufacturing cost becomes high.

SUMMARY OF THE INVENTION In view of the above problems with the prior art, the present invention reliably prevents the chair back support rods from contacting other objects, such as when the chair is turned, to damage them or to damage the chair back support rods themselves. It is an object of the present invention to provide a chair which can be used at the same time and has a small number of parts, a simple structure and easy assembly.

Moreover, an object of this invention is to provide the chair which can connect the chair back frame and chair back support rod which comprise a chair back with a simple structure firmly.

According to this invention, the said subject is solved as follows.

(1) As a chair:

Leg;

A support base supported by the legs;

A seat supported by the support base;

It has an upright part facing upward, a forward part facing forward, and a bend part which connects the standing part and a forward part, and the whole part of the said forward part is A chair backrest support rod attached to the support base, the chair backrest supporting rod having a substantially L shape when viewed from the side;

A chair back supported by a standing portion of the chair back support rod;

A protective cover covering at least a portion from the rear surface of the bent portion to the lower surface of the chair back support rod is provided.

With such a configuration, it is possible to reliably prevent the chair back support rod from contacting another object when the chair is turned, for example, to damage it or to damage the chair back support rod itself, and in particular, to turn the chair back support rod. The lower surface of the negative portion abuts on the upper edge of the upper portion of the mounting on the floor in a low position, thereby preventing it from being damaged or damaging the chair back support rod itself.

(2) In the above (1), the protective cover is made of a cushioning material.

With such a structure, the buffering effect when the chair back support rod contacts another object at the time of a chair turning, etc. can be improved.

(3) In the above (1), the protective cover is made of a soft synthetic resin material or rubber.

With such a structure, the buffering effect when the chair back support rod contacts another object at the time of a chair turning, etc. can be improved.

(4) The said standing part is comprised by a pair of the left and right standing rods which extend upwards consisting of a bifurcated shape from the said bending part,

The said turning part is comprised by a pair of left and right turning rods extended in the front by the bifurcated shape from the said bending part,

The protective cover has a bent cover portion, a standing cover portion, a turning cover portion,

The bent cover part covers the rear side of the bent part, the standing cover part is connected to the bent cover part and covers the back of each of the standing rods, and the turning cover part is connected to the bent cover part and is further installed on each of the turning rods. Cover the bottom of the

With this configuration, it is possible to stably support the chair back with only one member without preparing two chair back support rods, and at the same time, without providing a plurality of protective covers, only one member is sufficient to reduce the number of parts. The structure can be simplified and can be easily assembled.

In addition, since the protective cover is provided with a pair of standing cover portions covering the rear surface of each standing rod in addition to the bent cover portion, and a pair of turning cover portions covering the lower surface of each turning rod, positioning of the protective cover is easy. Become.

(5) The chair back support rod according to the above (4) has an X shape when viewed from the rear,

The bending cover part covers the intersection of the center of the X-shape,

The bent cover portion has a width wider than that of the standing rods and / or the turning rods, and causes the curved lid to bulge in a nearly spherical shape toward the rear.

With such a configuration, the chair back can be reliably supported with a right-to-left balance, and at the same time, the corner portion of the back of the chair back support rod can be removed to avoid concentration of stress when contacting with other objects, and also beautiful It can exhibit appearance.

(6) The method according to (4) or (5), further comprising a recess for attaching the chair back to the rear of the upper end of the standing rod in the chair back support rod,

In the recess, the elastic protrusions provided on the front surface of the upper end of each standing cover portion in the protective cover are press fitted.

With such a configuration, the leading end of each standing cover portion of the protective cover can be reliably attached to the chair back support rod so as to be difficult to peel off, and the concave for attaching the chair back can be closed to improve appearance. have.

(7) The air gap is formed in the above (1), wherein a gap is formed in a part of an opposite portion of the back of the chair back support rod and the front of the protective cover,

At least a portion of the protective cover corresponding to the void portion is formed of an elastic material.

With such a configuration, when another object comes into contact with the rear surface of the portion corresponding to the void portion in the protective cover, the cushioning action of the protective cover is further enhanced by elastic deformation so that the portion corresponding to the void portion enters the void portion. It can increase.

(8) The chair back according to the above (1), wherein the chair back has a chair back frame,

The chair back frame includes a space member disposed in the center and a strip-shaped frame member on which a stretched material for closing the space portion is elongated.

The chair may further include a pair of left and right protrusions protruding inward to face each other in a left and right direction at an almost intermediate position in the vertical direction at the inner edge of the chair back frame in the left and right direction.

With such a configuration, the chair back frame constituting the chair back can be easily formed.

In addition, since the load applied to the chair back frame during reclining acts in the curved direction of the chair back frame according to the rear inclination of the chair back, by forming a protrusion, the bending strength of the chair back frame itself can be improved. .

In addition, since the projecting portion can secure a sufficient area for the connection between the chair back frame and the chair back support rod by the large area of the protrusion, the chair back frame and the chair back support rod can be firmly and simply Can connect with the structure.

(9) In the above (8), the protruding portion is expanded toward the rear side.

In such a configuration, since the protrusions are expanded toward the rear side, the strength of the chair back frame can be increased.

(10) In the above (8), the upper portion of the chair back support rod is attached to the rear surface of the protruding portion.

With such a configuration, the connection strength between the chair back frame and the chair back support frame can be increased.

(11) The above-mentioned projection (10) is characterized in that the upper part of the chair back support rod is rotatable in all directions within a desired limit range by a pivot shaft facing left and right in the protruding portion. It is assumed that it is pivoted.

With such a configuration, the backrest can smoothly rotate with respect to the chair back support rod, following the movement of the seated person's back.

(12) In the above (11), a buffer member made of a soft elastic body is sandwiched between the protrusion and the upper part of the chair back support rod.

With such a configuration, it is possible to effectively prevent the connection part of the chair back frame and the chair back support rod upper part from being worn or broken down according to the long-term use of the chair.

According to the present invention, it is possible to reliably prevent the chair back support rod from contacting with another object when the chair is turned, for example, to damage it or to damage the chair back support rod itself, and at the same time, the number of parts is small and the structure is small. A chair can be provided for simple and easy assembly.

In addition, the chair back frame and chair back support rod constituting the chair back can be firmly connected with a simple structure.

1 is a front view of a chair that is a first embodiment of the present invention.
2 is a side view of the chair.
3 is a rear view of the chair.
4 is an enlarged longitudinal cross-sectional view along the line IV-IV of FIG. 3.
5 is an enlarged cross-sectional plan view along the line VV of FIG. 2.
6 is a side view when the chair back support rod is inclined backward.
It is a perspective view of the chair which is 2nd Embodiment of this invention.
8 is a rear view of the chair.
9 is a side view of the chair.
10 is an enlarged perspective view of the frame body in an unstretched state of the stretched material.
11 is an exploded perspective view of the frame body in the unstretched state of the stretched material.
12 is an exploded perspective view seen from the rear of the frame body.
FIG. 13 is an enlarged longitudinal sectional view of the stretched state of the stretched material in the line XIII-XIII in FIG. 10.
FIG. 14 is an enlarged cross-sectional view of the stretched state of the stretched material in the XIV-XIV line of FIG. 10.
FIG. 15 is an enlarged longitudinal sectional view of the stretched state of the stretched material in the XV-XV line of FIG. 10.
FIG. 16 is an enlarged longitudinal sectional view of the stretched state of the stretched material in the XVI-XVI line of FIG. 10.
FIG. 17 is an enlarged cross sectional view of a main portion showing the connection state of the frame body and the chair back support frame in the line XVII-XVII in FIG. 9; FIG.
It is an exploded perspective view which shows the connection state of the said frame body and a chair back support frame.

Embodiments of the present invention will now be described with reference to the accompanying drawings.

1-6 shows the chair which is 1st Embodiment of this invention.

As shown in Figs. 1 and 2, the chair has a leg body 3 having five leg rods in a radial shape provided with a caster 1 at the distal end. Doing. In the center of the leg body 3, the telescopic leg column 4 provided with a gas spring (not shown) is provided, and the rear part of the support base 5 is provided in the upper end of the leg column 4. ) Is fixed.

The support base 5 has a substantially hollow box shape in which the upper surface is opened, and the opening of the upper surface is covered by a removable cover (not shown).

Inside the support base 5, there are provided pressing means for pressing the chair back 6 in the upright direction, pressing means for pushing the seat 7 forward (all not shown), and the like. Since it does not directly relate to the present invention, illustration and detailed description are omitted.

On the rear part of the support base 5, the pivot shaft 8 of the hexagonal columnar shape which faces to the left-right direction is pivotally supported so that it may rotate around its center axis line and penetrate.

At both ends of the pivot shaft 8 protruding left and right from both side walls of the support base 5, the front end of the chair back support rod 9 supporting the chair back 6 is integral with the pivot shaft 8. It is fixed to rotate. The pivot shaft 8 stands in the chair back 6 and the chair back support rod 9 by means of pressing means (not shown) made of, for example, a torsion coil spring or the like installed in the support base 5. Direction, that is, counterclockwise in FIG. 2.

The chair back support rod 9 has an almost L-shape when viewed from the side, in which the upright portion 9a facing upward and the forward turning portion 9b connected to each other through the bent portion 9c are installed. The part 9a consists of a pair of left and right standing rods 9d and 9d extending upwards in a bifurcated shape from the bent part 9c, and the forwarding part 9b is bifurcated from the bent part 9c. Hexagonal holes 9f and 9f facing the left and right directions provided at the front end of the pair of left and right pairs of forward-loading rods 9e and 9e, which form a shape and extend forwardly. At each end of the pivot shaft 8 is fitted.

As shown in FIG. 3 and FIG. 4, the standing rods 9d and 9d on the left and right sides of the chair back support rod 9 extend in an arc shape from the bent portion 9c to the inclined outer side and are further extended left and right. By extending the rods 9e and 9e to the inclined outer electric charge, the chair back support rod 9 has an X shape when viewed from the rear side, and the width of the bent portion 9c which is the intersection of the centers is each It is larger than the width | variety of the standing rod 9d and the turning rod 9e, and it expands in a substantially spherical shape toward the back.

The shallow portion 9c in the chair back support rod 9 and almost the rear surface of both standing rods 9d and 9d, and a portion extending from the rear surface of the rear surface of the rear turning rods 9e and 9e to the rear portion, are continuous shallow. A recess 10 is provided, and a protective cover 11 covering the rear surface of the chair back support rod 9 is detachably fitted to the recess 10 so that an adhesive or a surface fastener is attached thereto. It adheres to the chair back support rod 9 by the screw, or is screwed as needed.

The thickness of the protective cover 11 is almost the same as the depth of the recessed part 10, and it is preferable that the surface of the protective cover 11 and the surface of the chair back support rod 9 are matched, and a step | step does not arise. .

The protective cover 11 consists of a soft synthetic resin material, rubber | gum, or other cushioning material, the bend cover part 11a which covers the back surface of the bend part 9c in the chair back support rod 9, and this bend cover part It is connected to (11a), and is also installed on the standing cover portion (11b) covering the back of each standing rod (9d), and the bending cover portion (11a), and is also turned to cover the lower surface of each of the turning rod (9e) The cover part 11c is provided.

A recess 12 for attaching the chair back 6 is provided on the rear of the upper end of each standing rod 9d in the chair back support rod 9, and a protective cover () is provided in the recess 12. By press-fitting the elastic protrusion 11d provided in the upper end part front of each standing cover part 11b in 11), the tip part of each standing cover part 11b in the protective cover 11 is sure to be difficult to peel off. It can be attached to the chair back support rod 9 at the same time, and the recessed part 12 for attaching the chair back 6 can be closed, and the appearance can be improved.

In addition, a gap portion (not shown) is formed in a portion of the rear portion of the chair back support rod 9 and an opposite portion of the front surface of the protective cover 11, and also at least a portion corresponding to the void portion in the protective cover 11. Is formed of an elastic material, when another object abuts against the rear surface of the portion corresponding to the gap in the protective cover 11, the elastic deformation is performed so that the portion corresponding to the gap enters into the gap. It is possible to further increase the buffering effect of the protective cover 11.

Since the protective cover 11 is provided on the chair back support rod 9, the chair back support rod 9 abuts against another object when the chair is turned, for example, to damage it or to support the chair back support rod 9. ) It is possible to reliably prevent itself from being damaged, and in particular, the lower surface of the turning portion 9b in the chair back support rod 9 abuts the upper surface edge of the mounting on the floor in a low position, thereby damaging it. Or damage to the chair back support rod 9 itself.

The chair back 6 is formed of an elastically deformable soft synthetic resin material having a circular arc shape in which the center part is recessed to the rear when viewed in a plan view, or a cushion material (not shown). ), And is encapsulated with a skin material (not shown), and the rear surfaces of both sides of the upper and lower middle portions are standing rods left and right on the chair back support rod 9. It is supported by the upper end of 9d, 9d so that rotation is possible about the axis line toward a substantially left-right direction, and required angle rotation is possible also in the direction deviating from the said axis line.

In order to support the chair back 6 in this way, as shown in FIG. 5, the front end of the convex shaft 13 which protruded in front of the upper end part of each standing rod 9d in the chair back support rod 9, It is fitted to the receiving hole 14 provided in the side rear part of the chair back 6 which opposes it, and is provided in the substantially right and left axial hole 15 provided in the front-end | tip part of the convex shaft 13, and a storage hole ( An anti-falling pin 17 in a substantially left-right direction, with both ends fixedly attached to a cylinder portion 16a opened rearward from the receiving plate 16 fixedly attached to the rear of the chair back 6 so as to form 14). ) Loosely.

The distal end portion 13a of the convex shaft 13 is a sphere, and the shaft hole 15 passes through the center of the sphere, and the shaft hole 15 has an inner diameter of the central portion 15a. The tapered hole parts 15b and 15b which are substantially equal to the outer diameter of the fall prevention pin 17, and whose diameter gradually expands outward from the center part 15a to both sides are formed.

In the example shown in FIG. 5, the fall prevention pin 17 is a bolt, and it penetrates the cylinder part 16a of the accommodating plate 16, and the axial hole 15 of the front end part 13a of the convex shaft 13, By screwing the nut 17a at the distal end thereof, the release preventing pin 17 is prevented from falling out of the tube portion 16a and the shaft hole 15, and the convex shaft 13 is removed from the receiving hole 14, respectively. have. The fall prevention pin 17 may be a simple pin instead of a bolt, and the mounting direction thereof may be parallel not only to the left and right directions but also to the rearward direction of the chair back which is slightly inclined thereto. In addition, the outer circumference of the connecting portion between the convex shaft 13 and the tubular portion 16a is covered by the cover 18 which is elastically deformable.

In the middle of the convex shaft 13, a flange portion 13b having an enlarged diameter is formed, and the flange portion 13b having an enlarged diameter is brought into contact with the front surface of the upper end of the standing rod 9d, and convex. The recessed portion 13c of the shaft 13 is fitted into the rearward facing shaft hole 19 provided on the front end of the standing rod 9d, and is provided at the rear of the upper end of the standing rod 9d. The convex shaft 13 is fixedly attached to the upper end of the standing rod 9d firmly by fixing and attaching the convex shaft 13 to the standing rod 9d by the fixing screw 20 which is fitted to the (12). It is.

It is preferable to make the inner end surface of the accommodating hole 14 into the spherical surface which comprises the spherical surface and the shape of the spherical surface of the front-end | tip part 13a of the convex shaft 13.

In addition, the convex shaft 13 is protruded to the rear of the side of the chair back 6 to the rear, and is accommodated in the front of the upper end of each standing rod 9d in the chair back support rod 9 opposite thereto. The hole 14 may be formed.

When the chair back 6 is supported in this manner, the chair back 6 is only supported by a simple structure of loosely fitting the release preventing pin 17 into the shaft hole 15 formed in the distal end of the convex shaft 13. Since the required angle can be rotated and supported not only around the axis in the left-right direction, but also in the direction away from the axis, the chair back 6 can be secured without using expensive means such as a ball joint. I can support it.

The rear part of the back of the pivot shaft 8 in the support base 5 and the lower part of the chair back 6 above it are connected by the connecting rod 21, and the chair back support rod 9 is When inclined rearward, the lower part of the chair back 6 is pressurized to the rear with respect to the chair back support rod 9 by the connecting rod 21 rotated to the rear lower side.

That is, the front end of the connecting rod 21 is connected to the support base 5 by a shaft 22 facing in the left and right direction, and the rear end of the connecting rod 21 is fixed to the rear end of the lower end of the chair back 6. It is connected to the lower end part which protrudes downward from the chair back 6 in the attached mounting bracket 23 by the shaft 24 which runs to the left-right direction.

The connecting rod 21 forms an arc-shaped rigid body when viewed from the side, in which the center of curvature is located above (or below) the connecting rod 21, and the left and right ones in the chair back support rod 9 are formed. By being provided between the pair of redirecting rods 9e and 9e, it is sandwiched between the two redirecting rods 9e and 9e, making it difficult to be exposed to the outside.

With such a configuration, as shown in Fig. 6, when the chair back support rod 9 is inclined backward during reclining, the connecting rod 21 is also inclined rear accordingly, and the chair back support rod at that time is Due to the difference between the pivot center (9) pivot center (9) and the pivot center (axis 22) of the connecting rod 21, the lower part of the chair back 6 is located at the rear end of the connecting rod 21. The chair back 6 is pressurized to the rear by the back of the chair back support rod 9 with the chair back support rod 9 centered on an axis line (fall-off pin 17) facing in the horizontal direction. It rotates in the rotation direction (rear tilt direction) and the reverse direction (standing direction).

Rear support means for guiding the rear part and the whole of the seat supporter 25 to support the seat 7 in front and rear position adjustment so as to move rearward downward in association with the rear inclination of the chair back support rod 9 ( The support base 5 is supported by 26 and all the support means 27.

The rear support means 26 has a lower end portion at a portion behind the pivot shaft 8 of the chair back support rod 9 at the support base 5 and in front of the shaft 22 of the connecting rod 21. The upper end of the link 29 pivoted by the left and right shafts 28 is pivotally attached to the rear portion of the seat support 25 by the left and right shafts 30, and the upper end of the link 29 is pivoted. 30 in the forward and backward direction slots 31 formed in the rear portion of the lower end of the link 29 in each of the forward rods 9e of the chair back support rod 9. It is fitted to slide.

This slot 31 is provided in the upward protrusion 9g provided in the back part rather than the hexagon hole 9f in each turning rod 9e of the chair back support rod 9.

The whole support means 27 slide-fits the axial direction 32 provided in the whole sheet support body 25 to the slot 33 facing rear lower side formed in the support base 5 so that sliding is possible. Combined.

This shaft 32 is always pressed toward the front by the press means (not shown) provided in the support base 5.

In addition, instead of the said structure, this all support means 27 connects the upper end part of the uplink support link provided in all of the support bases to all the seat | pieces, as described in patent document 1, and a support link is rearward. It may be made to be inclined (not shown).

Since the chair is configured as described above, when the seated person is leaning against the chair back 6, the chair back 6 is elastically deformed so that the center part is recessed from both sides to the rear when viewed in a plan view. The elastic deformation of the chair back 6 at this time is permitted by the left and right fall prevention pin 17 inclining slightly in the shaft hole 15 of the convex shaft 13.

In addition, together with the chair back 6, the chair back support rod 9 is inclined backward against the pressing force of the pressing means provided in the support base 5, whereby the connecting rod 21 is downward. It is inclined backward about the axis 22 of the.

The rear inclination angular velocity of the connecting rod 21 at this time is greater than the rear inclination angular velocity of the chair back support rod 9, and the shaft 22 of the connecting rod 21 is the pivot axis of the chair back support rod 9. Since it is located behind the 8, the lower end part of the chair back 6 is pressurized back by the shaft 24 of the rear end part of the connecting rod 21, and the chair back 6 is a chair back support rod 9 ), It is rotated in the rotational direction (rear tilt direction) and the reverse direction (standing direction) of the chair back support rod 9 centering on the axis line (fall prevention pin 17) which faces to the left-right direction.

That is, even when the chair back support rod 9 is inclined rearward at the time of reclining, the chair back 6 is suppressed from being inclined rearward and tries to maintain the standing state, so that the seated person inclines the back backward. While taking a comfortable position, the gaze or the arm can be directed forwardly or downwardly without difficulty, so that a typing operation of the keyboard can be performed in a comfortable position.

In addition, the keyboard, while taking the above-described comfort posture, is simply added to the basic structure of the conventional chair by connecting the lower portion of the support base 5 and the chair back 6 by the connecting rod 21. It is necessary to perform a typing operation and the like easily, and to make the chair back 6 itself bendable forward and backward when viewed from the side as in the prior art, or support the chair back 6 by a complicated support structure. There is no, and the structure of the whole chair can be simplified.

According to the rear inclination of the chair back support rod 9, the shaft 30 is moved rearward and downward by the slot 31 provided in the upwardly projecting piece 9g, so that the link 29 rearwards. Incline

The rear inclination angular velocity of the link 29 at this time is larger than the rear inclination angular velocity of the chair back support rod 9, and the shaft 28 of the link 29 is the pivot shaft 8 of the chair back support rod 9. Since it is located at the rear side, the rear movement amount of the shaft 30 becomes larger than the rear movement amount of the slot 31 in the chair back support rod 9, and the shaft 30 slides the inside of the slot 31 toward the rear side. The rear part of the sheet support body 25 is largely moved to the rear lower side with the movement and the movement of the shaft 30 at that time.

That is, the movement stroke to the rear of the back of the seat 7 at the time of the rear inclination of the chair back support rod 9 can be enlarged, and, therefore, at the time of the back inclination of the chair back support rod 9, the chair back The lower part of the 6 is pressurized to the rear by the rear end of the connecting rod 21, so that the rear part of the seat 7 can be largely moved rearward, so that the lower end of the chair back 6 and the seat 7 The rear part of the) is prevented from being separated, and a comfortable seating feeling can be obtained.

As the rear portion of the sheet support 25 is moved rearward downward by the shaft 30, all of the sheet support 25 resists the pressing force of the pressing means provided in the support base 5, and the shaft of all of them. The 32 moves smoothly downward rearward by sliding downward along the slot 33.

In this way, when the chair back support rod 9 is inclined rearward, the chair back 6 is pushed back by the connecting rod 21 at the lower end thereof, and the chair back support rod 9 is maintained so as to stand up. ), The seat 7 can be moved to the rear lower side so as to follow the movement of the lower part of the chair back 6, and forward the eyes or the arms forward while inclining the back to the seated person. Or it can make it possible to take a comfortable working posture which can face to front lower side without difficulty, and can perform typing of a keyboard in a comfortable posture.

7-18 shows the chair which is 2nd Embodiment of this invention.

In addition, the same or similar member as in 1st Embodiment is shown with the same code | symbol, and detailed description is abbreviate | omitted.

In the first embodiment, the chair back 6 is formed of a sheet material made of a soft synthetic resin material that can be elastically deformed, or an entire surface thereof, which is covered with a cushioning material with a cushion material therebetween, but according to the second embodiment. In this case, the chair back 36 is assumed to have a mesh stretching structure.

As shown in FIGS. 10-12, the chair back 36 has a mesh-shaped stretching material 37 and a space 38 in which the stretching material 37 is extended to the front and opened at the center thereof. It is comprised by the frame body 39 which is a chair back frame which can block | block a.

The frame 39 is composed of a band-shaped frame member made of synthetic resin continuous in the circumferential direction, and has an upper horizontal frame portion 40A and a pair of left and right side vertical frame portions having a desired rearward tilting state ( 40B and 40B and the lower horizontal frame part 40C are provided with the main frame 40 which becomes substantially rectangular from the front view continuous in the circumferential direction.

The upper horizontal frame portion 40A, which forms part of the circumferential edge of the main frame 40, has an arc-shaped curved surface whose front face is inclined upward and rearward, as shown in FIG. A locking groove portion 41 having a cross-sectional shape that is thickened toward the side and at the rear edge portion of the outer circumferential edge thereof to which the edge member 37a provided at the circumferential edge portion of the stretching material 37 is engaged is formed along the left and right directions. It is.

As shown in FIG. 14, the side vertical frame part 40B is a cross-sectional shape extended so that it might become a thin part toward the said space part 38 from the inner edge of a thick part with a thick outer edge side. At the same time, the outer edge portion of the outer edge portion, the engaging groove portion 42, which is engaged with the edge member 37a provided at the peripheral edge portion of the stretchable material 37, can communicate with the engaging groove portion 41. It is installed along the up and down direction.

As shown in FIGS. 11 and 12, the lower horizontal frame portion 40C is divided into two in the thickness direction in the front-rear direction, leaving a part of the left and right ends, and the rear side thereof is the base 43, and the base A front face, which cuts a part of the left and right central portion of the 43 in a desired interval, and at which the opposing ends 44a, 44a of the cutout 44 are assembled with the back face facing the front face of the base 43, is assembled. It is connected by the connection frame 45 which consists of a cover part of the side.

In the left-right direction center part of this connecting frame 45, the fitting part 46 which fits in the ablation part 44 of the said base 43 protrudes toward the rear, and this fitting part 46 Has a width dimension substantially equal to the spacing dimension between opposing surfaces of opposing end portions 44a and 44a of the cutout portion 44 in the initial state of the main frame 40.

In addition, the attachment bracket 23 to which the rear end of the connecting rod 21 pivotally supported by the lower part of the frame body 39 which forms the chair back 36 is attached by the shaft 24 is the said ablation part 44 It extends between opposing ends 44a and 44a in Esau, and is fixed to the back surface of the base 43.

Accordingly, when reclining the chair back 36, the base 43 is elastically deformable with respect to the load by the connecting rod 21 applied to the rear center of the base 43 via the attachment bracket 23. It is.

In the connecting frame 45, a pair of left and right pairs extending from both ends of the front side of the fitting portion 46 toward the front side of the opposing ends 44a and 44a of the cut-out portion 44 of the base 43 are provided. The fixed attachment parts 47 and 47 are formed.

The rear surface of these fixing attachment parts 47 abuts against the front surfaces of the opposing ends 44a and 44a of the ablation section 44 and extends beyond the opposing ends 44a and 44a of the ablation section 44. It is fixed to the front surface of 43, respectively.

By assembling the base 43 and the connecting frame 45, the lower horizontal frame portion 40C is formed in a thick cross-sectional shape having a hollow structure as shown in Figs. In the hollow portion of the plurality of ribs 48, 49 along the longitudinal direction in the vertical direction and the left and right direction are projected toward the front and rear direction, respectively.

Moreover, the edge part of the rib 48 which opposes the opposing surface of the opposing edge parts 44a and 44a in the cutout part 44 of the base 43 is fitted when the connecting frame 45 is assembled to the base 43. The left and right end surfaces of the engaging portion 46 are in contact with each other.

A bolt insertion hole 50 is formed in the vicinity of the rib 48 at the base 43, and the left and right fixing attachment portions 47 of the connecting frame 45 facing the bolt insertion hole 50 are formed. In the vicinity of the rib 49, a plurality of female screw holes 51 are formed on the left and right side with the fitting portion 46 interposed therebetween.

As shown in Fig. 15, bolts 52 inserted through the bolt insertion holes 50 are screwed into these female threaded holes 51, and the bolts 52 are screwed together. ), The left and right fixing attachment portions 47 of the connecting frame 45 are fixedly attached to the base 43.

In addition, the left and right fixing attachment parts 47 in the connecting frame 45 are divided into two, respectively, left and right, and these division part 47A is provided with the some bolt insertion hole 53, and these bolt insertion is carried out. The bolt 55 is inserted into the female threaded hole 54 formed in the front surface of the base 43 so as to face the passage hole 53 from the front through the bolt insertion hole 53, respectively. By combining, the partition portion 47A is fixed to the front surface of the base 43.

Thus, by dividing the fixed attachment part 47 of the connection frame 45, when the said chair back 36 is reclining, the load of the base 43 with respect to the load applied to the back center of the base 43 is The elastic deformation is facilitated, the dispersion of stress concentration can be achieved, and the allowable range of the processing precision with respect to the base 43 can be expanded.

The vicinity of the female screw hole 51 in the connecting frame 45 is a protrusion 56 projecting rearward, and the protrusion 56 is, as shown in FIG. 15, in the fastened state, the base 43. It can be engaged with the recess 57 formed in the vicinity of the bolt insertion hole 50 of the.

Grooves 58 are formed on the rear surface of the fixed attachment portion 47 in the connecting frame 45, and the grooves 58 have opposing end portions 44a at the cut-out portions 44 of the base 43. By facing the front surface of 44a, it is possible to communicate with the engaging groove portion 42 formed in the side vertical frame portion 40B and the engaging groove portion 46a formed on the lower surface of the fitting portion 46, respectively. The edge member 37a provided at the peripheral edge portion of the stretchable member 37 is engaged.

The stretching material 37 includes edge members 37a provided at the peripheral edge portions of the stretching material 37 in the engaging groove portions 41 and 42 and the groove portions 58 formed at the peripheral edge portions of the main frame 40. By retracting and engaging so as to wind backward from the front side of the main frame 40 toward the rear, the frame portion 39 is stretched over the entire front side circumference, and the space 38 in the center of the frame 39 is formed. It is supposed to block the.

Thereby, since the extending | stretching material 37 can be extended | stretched in the tension state over the whole front surface of the frame body 39, and the whole front surface of the frame body 39 is covered with the extending | stretching material 37, it is design-wise. You can make a smart impression.

In addition, it is preferable that the extending | stretching material 37 is a net shape or mesh shape which braided or woven the fiber which has elasticity other than high tension plastics in net shape, for example, A simple woven fabric, You may form with a synthetic resin sheet, a porous sheet material, etc.

Next, the extending | stretching procedure of the extending | stretching material 37 with respect to the frame body 39 is demonstrated below.

First, from the main frame 40, the left and right sides of the main frame 40 in the main frame 40 in a state where the connecting frame 45 is removed leaving the divided portion 47A of the fixed attachment portion 47 on the base 43. Reduction of the frame portion 40B to the opposing end portions 44a and 44a of the cutout portion 44 at the base 43, as shown by a virtual line in FIG. 11, resisting the elastic force thereof. Elastic deformation.

In this state, on the circumferential edge of the main frame 40, the stretching material 37 is folded back to the rear from the front side, and the engaging groove portions 41, 42, 46a formed on the circumferential edge of the main frame 40 are wound. ), The stretching member 37 is attached in a tensioned state to the peripheral edge portion of the main frame 40 by engaging the edge member 37a provided at the peripheral edge portion of the stretching member 37.

Next, the side vertical frame portion 40B on the left and right sides of the main frame 40 is expanded to its initial state by using the elastic return force, and in the state in which the tension member 37 is further provided with tension, Assembling the rear surface of the connecting frame 45 on the front surface of the 43, the fitting portion 46 of the connecting frame 45, the left and right cross-section between the opposing ends (44a, 44a) of the cutout 44 After fitting so that the contact part 48a at the opposing surface can be abutted, the left and right fixing parts 47 and 47 of the connecting frame 45 are fastened by bolts 52, thereby cutting off the cutting part 44. Opposite ends 44a and 44a of are connected.

Thereby, the extending | stretching material 37 can be extended | stretched efficiently without performing a complicated process, and the tension | tensile_strength of the extending | stretching material 37 can be maintained uniformly over the frame 39 whole.

In the case where the connecting frame 45 is fixedly attached to the front surface of the base 43, for example, a downward claw is attached to the rear upper edge of the fixed attachment portion 47 and the partition portion 47A. An upward claw may be provided at the lower rear edge, and the claws may be engaged with the front surface of the base 43 to effectively prevent displacement of the connecting frame 45 up and down with respect to the base 43.

The upper portion of the chair back support rod 9 constituting the chair back support frame is connected by pivotally supporting the rear portion of the frame 39.

That is, as shown in FIG. 10, the spaces above the left and right side vertical frame portions 40B of the main frame 40 at the substantially middle positions in the vertical direction at the left and right inner edges thereof can face each other in the left and right directions. A pair of left and right protrusions 59 protruding inward toward the portion 38 are formed by expanding toward the rear.

As shown in FIG. 8, the upper end of the left and right standing rods 9d in the chair back support rod 9 can follow the reclining operation of the chair back 36 at the rear end of the protrusion 59. It is designed to be rotatably connected in all directions in a desired limit range around the axis almost in the left-right direction and also in the direction away from the axis.

The left and right protrusions 59 are inclined inward to each other toward the front so that their central axes can be matched to the curved surface of the forward concave when viewed in the plane of the frame 39 (FIGS. 10 and 12). And tilted upward toward the front so as to match the rear tilt angle of the frame 39 (see FIG. 9).

As shown in FIG. 17 and FIG. 18, the convex shaft 61 fixed by the fixing screw 60 faces the front of the upper end of the left and right standing rods 9d in the chair back support rod 9 toward the front. At the same time, the front end of the convex shaft 61 is formed into a spherical sliding contact surface 62, and the sliding contact surface 62 passes through the shaft hole 63 in a substantially horizontal direction. It is formed.

In this shaft hole 63, taper hole parts 64 and 64 are formed in the left and right sides from the center of the sliding contact surface body 62 to gradually increase in diameter outward.

On the other hand, in the projection 59 of the side vertical frame portion 40B, a fitting hole 65 is opened to the rear, and the fitting hole 65 has a receiving hole 66 toward the rear. The receiving cylinder member 67 to be opened is fitted.

The sliding contact surface body 62 of the convex shaft 61 is inserted into the housing hole 66 of the housing cylindrical member 67 from the rear to allow sliding contact, and is substantially left and right of the shaft hole 63. By loosely inserting the fall prevention pin 68 facing in the direction, the left and right ends of the fall prevention pin 68 are inserted into the locking fixing holes 69 formed on the left and right sides of the accommodation cylinder member 67 to fix the locking. The convex shaft 61 and the receiving cylinder member 67 are connected to each other.

A bolt shaft 70 protrudes forward to the front end of the housing cylindrical member 67, and the bolt shaft 70 has its front end at the bottom of the fitting hole 65 of the protruding portion 59. Through the through-hole 71 which penetrated the part, it protrudes toward the front side of the projection part 59, and it screws and fastens the nut 72 to this projection shaft part 70a from the front, and the said accommodation cylinder The member 67 is firmly fixed to the fitting hole 65 of the protruding portion 59.

Accordingly, the upper end portions of the left and right standing rods 9d in the chair back support rod 9 can be rotated around the axis of the release preventing pin 68, and the required angle can be rotated in the direction away from the axis. It is adapted to be connected to the rear portion of the protrusion 59.

Between the front end of the upper end part of the standing rod 9d, and the rear end surface of the protrusion 59, a buffer member 73 made of a soft elastic body such as an elastomer is fitted.

This shock absorbing member 73 is capable of preventing the connection portion between the frame body 39 and the upper portion of the chair back support rod 9 from being worn or damaged due to prolonged use of the chair.

The fastening portion of the protruding shaft portion 70a of the bolt shaft 70 and the nut 72 exposed to the front of the protruding portion 59 is covered with a cap member 74 from the front of the protruding portion 59, and the fastening portion thereof. This is prevented from being exposed to the outside.

The cap member 74 presses the fixing rod 75 protruding toward the rear from the inner center thereof into the fixing hole 76 opened at the front end of the bolt shaft 70 to the front surface of the protrusion 59. Attached.

A gap a is formed between the front surface of the cap member 74 and the rear surface of the stretchable material 37 extended to the front surface of the frame body 39 so that the chair back 36 can be reclined at a desired interval. In such a case, even if the stretching member 37 is bent backward by a seated person or the like, the gap a does not touch the cap member 74 or the elastic deformation of the cap member 74. The cushioning portion of the bolt shaft 70 and the nut 72 does not directly touch the seated person's back.

This invention is not limited only to the said embodiment, It can implement in a myriad of modified aspects.

Claims (12)

As a chair:
Leg;
A support base supported by the legs;
A seat supported by the support base;
It has an upright part facing upward, a forward part facing forward, and a bend part which connects the standing part and a forward part, and the whole part of the said forward part is A chair backrest support rod attached to the support base, the chair backrest supporting rod having a substantially L shape when viewed from the side;
A chair back supported by a standing portion of the chair back support rod;
And a protective cover covering at least a portion from the rear surface of the bent portion to the lower surface of the chair back support rod. The method of claim 1,
A chair, wherein said protective cover is made of a cushioning material. The method of claim 1,
And the protective cover is made of soft synthetic resin material or rubber. The method of claim 1,
The standing portion is constituted by a pair of left and right standing rods extending in an upward direction in a two-pronged shape from the bent portion,
The said turning part is comprised by a pair of left and right turning rods extended in the front by the bifurcated shape from the said bending part,
The protective cover has a bent cover portion, a standing cover portion, a turning cover portion,
The bent cover part covers the rear side of the bent part, the standing cover part is connected to the bent cover part and covers the back of each of the standing rods, and the turning cover part is connected to the bent cover part and is further installed on each of the turning rods. Covering the bottom of the chair. The method of claim 4, wherein
The chair back support rod is X-shaped when viewed from the rear,
The bending cover part covers the intersection of the center of the X-shape,
The curved cover part is a chair whose width | variety is larger than the width | variety of the standing rod and / or the said turning rod, and it expands in a substantially spherical shape toward the rear. The method according to claim 4 or 5,
And a recess for attaching the chair back to the rear of the upper end of the standing rod in the chair back support rod,
The chair which press-fits the elastic protrusion part provided in the said recessed part in the front surface of the upper end part of each standing cover part in a protective cover. The method of claim 1,
A gap is formed in a part of the opposite part of the back of the chair back support rod and the front of the protective cover,
The chair of at least the part corresponding to the said space part in the said protective cover formed with the elastic material. The method of claim 1,
The chair back has a chair back frame,
The chair back frame includes a space member disposed in the center and a strip-shaped frame member on which a stretched material for closing the space portion is elongated.
The chair further includes a pair of left and right protrusions protruding inward to face each other in a left-right direction at an almost intermediate position in the vertical direction at the inner edge of the chair back frame in the left-right direction. . The method of claim 8,
The chair which extended the said protrusion toward back. The method of claim 8,
A chair having a top portion of the chair back support rod attached to a rear surface of the protrusion. The method of claim 10,
An upper portion of the chair back support rod has a pivot shaft facing left and right and is pivotally attached to the protruding portion so as to pivot in all directions within a desired limit. The method of claim 11,
And a cushioning member made of a soft elastic body is sandwiched between the protrusion and an upper portion of the chair back support rod.

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