CN102176847B - Chair - Google Patents

Abstract

A chair configured such that a backrest support rod does not make contact with an object when the chair is swiveled and is thus reliably prevented from damaging the object or from being damaged by the object and that the chair uses a reduced number of parts, has a simple structure, and can be easily assembled. A chair, wherein front portions of front facing sections (9b) of a backrest support rod (9) are mounted to a support base (5) supported by a leg body (3) and supporting a seat (7). The backrest support rod (9) is formed in an L-shape in a side view and comprises upwardly facing raised sections (9a) and the forwardly facing front facing sections (9b). The upwardly facing raised sections (9a) and the forwardly facing front facing sections (9b) are connected together through a curved section (9c), and the raised sections (9a) support a backrest (6). A protective cover (11) covers at least that portion of the backrest support rod (9) which extends from the rear surface of the curved section (9c) to the lower surface thereof.

Description

Chair

technical field

The invention relates to a chair whose back support bar is generally L-shaped in side view.

Background technique

In the past, the back support rod of the chair was generally L-shaped in side view, and the upright part facing upward and the forward part facing forward were connected to each other through the curved part. If it abuts against other articles and causes damage to the article or the back bar itself, a cover made of a soft material is used to cover the rear surface and the outer side of the back bar (for example, refer to Patent Document 1: Japanese Patent Laid-Open Publication No. 2002-136388 ).

In addition, the joint part of the leg frame and the back frame is covered with a cover for the joint part which allows the two cover parts to be mutually opened and closed by the hinge part (for example, refer to Patent Document 2: Japanese Patent Laid-Open Publication No. 2000-14478 Number).

However, in Patent Document 1, when the lower surface of the forward portion of the backrest support bar abuts against the corners of the upper surface of a low-position floor placed object, the placed object or the back bar itself will be damaged. Attaching the cover to the back support bar will increase the number of parts and the installation work will be cumbersome.

In Patent Document 2, the structure of the cover itself is relatively complicated, which increases the manufacturing cost.

Contents of the invention

In view of the above-mentioned problems in the prior art, the object of the present invention is to provide a chair that can reliably prevent damage to the article or the backrest support itself due to the abutment of the backrest support rod against other objects when the chair is rotated, etc. , and the number of parts is small, the structure is simple and easy to assemble.

Another object of the present invention is to provide a chair in which a back frame constituting a backrest and a backrest support bar can be firmly connected with a simple structure.

The present invention solves the above-mentioned problems by the following means.

(1) A chair comprising: a chair leg; a support supported by the chair leg; a seat supported by the support; a backrest support rod substantially L-shaped in a side view, and the backrest support rod comprises: The upright part facing upward, the forward part facing forward, and the curved part connecting the upright part and the forward part, the front part of the forward part is installed on the support; the backrest is composed of the an upright portion support of the backrest support rod; and a protective cover covering at least a portion of the backrest support rod from the rear surface of the curved portion to the lower surface.

According to the above-described structure, when the chair is rotated, etc., it is possible to reliably prevent damage to the article or the back support rod itself due to the abutment of the back support rod against other objects, and in particular, it is possible to prevent damage to the front-facing lower surface of the back support rod. Abutting against the corners of the upper surface of a low-position floor placed object, resulting in damage to the placed object or the backrest support rod itself.

(2) In the above item (1), the protective cover includes a cushioning member.

According to the above configuration, the cushioning effect when the backrest support rod comes into contact with other objects can be enhanced when the chair is rotated or the like.

(3) On the basis of item (1), the protective cover is made of soft synthetic resin material or rubber.

According to the above configuration, the cushioning effect when the backrest support rod comes into contact with other objects can be enhanced when the chair is rotated or the like.

(4) On the basis of the above item (1), the upright portion includes a pair of left and right upright rods, and the pair of left and right upright rods extend upward from the curved portion in a bifurcated shape, and the The front part includes a pair of left and right forward rods, and the left and right pair of forward rods extend forward from the curved part in a bifurcated shape, and the protective cover includes a curved covering part, an upright covering part and a forward covering part, The curved covering part covers the rear surface of the curved part, the upright covering part is connected to the curved covering part and covers the rear surface of each of the upright rods, and the forward covering part is connected to the and cover the lower surface of each of the forward-facing rods.

According to the above structure, the backrest can be stably supported by only one member without preparing two backrest support rods, and only one member is required without preparing a plurality of protective covers, thereby reducing the number of parts and simplifying the structure. And easy to assemble.

In addition, since the protective cover is provided with a pair of upright covering parts covering the rear surface of each upright rod and a pair of forward covering parts covering the lower surface of each forward rod in addition to the curved covering part, the positioning of the protective cover is easy.

(5) On the basis of item (4), the back support rod is X-shaped in rear view, and the curved covering part covers the central crossing part of the X shape, and the lateral width of the curved covering part is larger than The transverse width of the upright rod and/or the forward-facing rod, and the curved covering portion protrudes rearward in a substantially spherical shape.

According to the above structure, the backrest can be supported in a right-to-left balance and reliably, and the corners of the back surface of the backrest support bar can be eliminated, thereby avoiding stress concentration when the backrest support bar abuts against other objects, and can present a beautiful appearance.

(6) On the basis of item (4) or (5), there is also a recess on the rear surface of the upper end of the upright rod of the backrest support rod, and the recess is used to install the backrest, An elastic protruding part is pressed and embedded in the concave part, and the elastic protruding part is arranged on the front surface of the upper end part of each upright covering part of the protective cover.

According to the above structure, the front ends of the upright covering portions of the protective cover can be securely attached to the backrest support bar with little peeling off, and the concave portion for backrest attachment can be closed to achieve a beautiful appearance.

(7) In the above item (1), a gap is formed on a part of the opposing portion between the rear surface of the back support rod and the front surface of the protective cover, and at least the protective cover is The part corresponding to the void part is formed of elastic material.

According to the above structure, when other objects abut against the rear surface of the part of the protective cover corresponding to the gap, the part enters the gap through elastic deformation, thereby further improving the cushioning effect of the protective cover.

(8) On the basis of the item (1), the backrest includes a backrest frame, and the backrest frame includes: a space part arranged in the center of the backrest frame; A tension member for closing the space portion is provided, and the chair further includes a pair of left and right extensions, and the left and right pair of extensions are substantially in the middle position in the up and down direction of the inner edge of the back frame in the left and right direction. Protrude toward the inside in an opposing manner along the left and right directions.

According to the above structure, it is easy to mold the back frame constituting the backrest.

In addition, since the load applied to the back frame when leaning acts on the direction in which the back frame bends as the back reclines, the bending strength of the back frame itself can be improved by forming the projecting portion.

In addition, by forming the overhang portion, the area required for connecting the back frame and the back support rod can be sufficiently ensured by the large-area overhang portion, and the back frame and the back support rod can be firmly connected with a simple structure.

(9) In the above item (8), the projecting portion protrudes rearward.

According to the above configuration, since the overhanging portion protrudes rearward, the strength of the back frame can be further increased.

(10) In the above item (8), the upper portion of the backrest support rod is mounted on the rear surface of the protruding portion.

According to the above configuration, the connection strength between the back frame and the back support frame can be improved.

(11) On the basis of item (10), the upper part of the backrest support rod is pivotally mounted on the extension part by the pivot shaft facing the left and right directions, so that the upper part of the backrest support rod can Omnidirectional rotation within specified limits.

According to the above structure, the backrest can be smoothly rotated relative to the backrest support rod following the movement of the user's back.

(12) In the above item (11), a cushioning member is sandwiched between the protruding portion and the upper portion of the back support rod, and the cushioning member includes a soft elastic body.

According to the structure, it is possible to effectively prevent wear or damage of the connecting portion between the back frame and the upper part of the back support rod due to long-term use of the chair.

The present invention provides a chair capable of reliably preventing damage to articles or the back support rod itself due to the abutment of the back support rod against other objects when the chair is rotated, etc., and having a simple structure and easy assembly with a small number of parts.

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

Description of drawings

Fig. 1 is a front view of a chair according to a first embodiment of the present invention.

Fig. 2 is a side view of the chair according to the first embodiment of the present invention.

Fig. 3 is a rear view of the chair according to the first embodiment of the present invention.

Fig. 4 is an enlarged longitudinal sectional end view taken along line IV-IV of Fig. 3 .

Fig. 5 is an enlarged cross-sectional plan view taken along line V-V in Fig. 2 .

Fig. 6 is a side view when the back support rod is tilted backward.

Fig. 7 is a perspective view of a chair according to a second embodiment of the present invention.

Fig. 8 is a rear view of a chair according to a second embodiment of the present invention.

Fig. 9 is a side view of a chair according to a second embodiment of the present invention.

Fig. 10 is an enlarged perspective view of the frame in a state where the tension member is not tensioned.

Fig. 11 is an exploded front perspective view of the frame in the state where the tension member is not tensioned.

Fig. 12 is an exploded rear perspective view of the frame in the state where the tension member is not tensioned.

Fig. 13 is an enlarged longitudinal sectional view taken along line XIII-XIII of Fig. 10 in a state where a tension member is tensioned.

Fig. 14 is an enlarged cross-sectional view taken along line XIV-XIV of Fig. 10 in a state where a tension member is tensioned.

Fig. 15 is an enlarged longitudinal sectional view taken along line XV-XV in Fig. 10 in a state where a tension member is tensioned.

Fig. 16 is an enlarged longitudinal sectional view taken along line XVI-XVI of Fig. 10 in a state where the tension member is tensioned.

Fig. 17 is an enlarged cross-sectional view of main parts showing a connection state of the frame body and the back support frame along the line XVII-XVII in Fig. 9 .

Fig. 18 is an exploded perspective view showing a connection state of the frame body and the back support frame along line XVII-XVII in Fig. 9 .

Detailed ways

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 6 show a chair according to a first embodiment of the present invention.

As shown in FIGS. 1 and 2 , the chair is provided with chair legs 3 , and the chair legs 3 have five radial leg rods 2 , and a rolling wheel 1 is provided at the front ends of the leg rods 2 . A telescopic leg column 4 is vertically arranged at the center of the chair leg 3, and the leg column 4 is equipped with a gas spring (Gas Spring, not shown), and the rear portion of the support 5 is fixed on the upper end of the leg column 4.

The support 5 has a substantially hollow box shape with an open upper surface, and a detachable cover (not shown) covers the opening on the upper surface.

Inside the support 5 are provided with two kinds of pressing devices (both are not shown in the figure), etc., one kind of pressing device applies force to the backrest 6 in the upright direction, and the other pressing device applies force to the seat 7 forward. As for the force, since the pressing device is not directly related to the present invention, illustrations and detailed descriptions are omitted.

The hexagonal column-shaped pivot 8 facing the left and right directions is pivotally supported on the rear part of the support 5 in a penetrating manner, so that the pivot 8 can rotate around its central axis.

The front end portion of the back support rod 9 for supporting the backrest 6 is fixed on both ends of the pivot 8 in a manner of integral rotation with the pivot 8, and the two ends of the pivot 8 extend from both side walls of the support 5 to Prominent left and right. Said pivot 8 applies a force towards the upright direction to the backrest 6 and the backrest support bar 9 through a pressing device (not shown) such as a helical spring or the like that is arranged in the support 5, that is, towards the vertical direction in FIG. 2 . Apply force in the counterclockwise direction.

The back support rod 9 is generally L-shaped in side view, and the upright portion 9a facing upward and the forward portion 9b facing forward are connected to each other by the curved portion 9c. The rods 9d, 9d branch from the curved portion 9c and extend upward. In addition, the forward portion 9b is composed of a pair of left and right forward rods 9e, 9e, and the pair of forward rods 9e, 9e branch from the curved portion 9c and extend forward. Extending, the ends of the pivot 8 are respectively fitted and fixed in the hexagonal holes 9f, 9f facing the left and right directions. .

As shown in FIGS. 3 and 4 , by making the left and right upright bars 9d, 9d of the backrest support rod 9 obliquely extend outward and upward in an arc shape from the curved portion 9c, and making the left and right forward bars 9e, 9e obliquely Extending toward the outside front and bottom, so that the backrest support rod 9 is X-shaped in rear view, the lateral width of the curved portion 9c as its central intersection is larger than the lateral width of each upright rod 9d and the forward rod 9e, and the curved portion 9c is approximately It protrudes rearward in a spherical shape.

On the curved portion 9c of the backrest support rod 9 and the substantially entire rear surface of the two upright rods 9d, 9d, and the part from the rear surface of the two forward rods 9e, 9e to the rear of the lower surface, a continuous shallow groove is provided. The recess 10, the protective cover 11 covering the rear surface of the backrest support rod 9 is detachably fitted on the recess 10, and bonded to the backrest support rod 9 by adhesive or Velcro, or screwed and fixed as required On the back support rod 9.

Preferably, the thickness of the protective cover 11 is substantially equal to the depth of the concave portion 10, so that the surface of the protective cover 11 is consistent with the surface of the back support rod 9, and no step difference occurs.

Protective cover 11 is made of soft synthetic resin material, rubber or other cushioning parts, and this protective cover 11 has: curved covering part 11a, covers the back surface of curved part 9c of back support bar 9; The curved covering part 11a and covers the rear surface of each upright bar 9d; and the forward covering part 11c is connected to the curved covering part 11a and covers the lower surface of each forward bar 9e.

The recess 12 for mounting the backrest 6 is provided on the upper end rear surface of each upright bar 9d of the backrest support rod 9, and is pressed by the elastic protrusion 11d provided on the upper end front surface of each upright covering part 11b of the protective cover 11. Fitted in the recess 12, the front end portion of each upright covering portion 11b of the protective cover 11 can be reliably installed on the backrest support rod 9 in a manner that is difficult to peel off, and at the same time, the recess 12 for installing the backrest 6 can be closed. , can make the appearance beautiful.

In addition, a gap (not shown) is formed on a part of the opposing portion of the rear surface of the back support rod 9 and the front surface of the protective cover 11, and if at least the portion of the protective cover 11 corresponding to the aforementioned gap is made of If the elastic material is formed, when other items abut against the rear surface of the part of the protective cover 11 corresponding to the gap, this part of the protective cover 11 will elastically deform and enter the gap, which can further improve the buffering effect of the protective cover 11.

Since the protective cover 11 is provided on the backrest support rod 9, it can reliably prevent damage to the article or the backrest support rod 9 itself due to the abutment of the backrest support rod 9 against other articles when the chair is rotated. It can also prevent the lower surface of the forward portion 9b of the backrest support rod 9 from abutting against the corners of the upper surface of the lower placed object on the ground, causing the placed object or the backrest support rod 9 itself to be damaged.

The backrest 6 has an arc shape in which the central part is concave backward in a plan view, and is a plate member made of elastically deformable soft synthetic resin material, or is covered with a cushioning member (not shown) on its front surface. Members of the surface material (not shown) etc., the rear surfaces of both sides of the middle part in the vertical direction of the backrest 6 are rotatable around the axis in the roughly left-right direction and can be rotated by a predetermined angle in a direction deviating from the above-mentioned axis. It is supported by the upper end parts of the left and right upright rods 9d, 9d of the back support rod 9. As shown in FIG.

Owing to support backrest 6 in the above-mentioned way, so as shown in Figure 5, protruding shaft 13 is protrudingly arranged on the upper end front surface of each upright bar 9d of backrest supporting rod 9, and seat hole 14 is arranged on the said each upright bar 9d. On the side rear surface of the backrest 6 opposite to the front surface of the upper end, the front end of the protruding shaft 13 is fitted into the seat hole 14, and the anti-drop pin 17 generally facing the left and right direction and the shaft hole 15 generally facing the left and right direction Movably fitted, the shaft hole 15 is set on the front end of the protruding shaft 13, and the two ends of the anti-dropping pin 17 are fixed on the cylindrical portion 16a of the seat plate 16 that opens to the rear. The seat plate 16 is used to form a seat The hole 14 is fixed on the rear surface of the backrest 6 .

The front end portion 13a of the protruding shaft 13 is a sphere, and the shaft hole 15 passes through the center of the sphere. The inner diameter of the central portion 15a of the shaft hole 15 is substantially equal to the outer diameter of the anti-dropping pin 17, and a tapered shape is formed from the central portion 15a to both sides. The tapered hole portions 15b, 15b gradually expand in diameter outward.

In the example shown in FIG. 5 , the anti-loosening pin 17 is a bolt, which is passed through the shaft hole 15 of the cylindrical portion 16a of the seat plate 16 and the front end portion 13a of the protruding shaft 13, and the nut 17a is screwed into the anti-loosening pin 17. The front end portion of the shaft prevents the fall-off preventing pin 17 from falling off from the cylindrical portion 16a and the shaft hole 15, and prevents the protruding shaft 13 from falling off from the seat hole 14. The anti-dropping pin 17 can also be a pin instead of a bolt. In addition, the installation direction of the anti-dropping pin 17 can be not only the left-right direction, but also the direction parallel to the rear surface of the slightly inclined backrest. In addition, the elastically deformable cover 18 covers the outer periphery of the connecting portion of the protruding shaft 13 and the cylindrical portion 16a.

An enlarged diameter collar portion 13b is formed at the middle portion of the protruding shaft 13, and the enlarged diameter collar portion 13b abuts against the front surface of the upper end portion of the upright rod 9d, and the base end portion 13c of the protruding shaft 13 is fitted into the shaft hole 19, The shaft hole 19 is arranged on the front surface of the upper end of the upright rod 9d and faces rearward, and the protruding shaft 13 is fixed on the upright rod 9d by means of a fixing screw 20 which is arranged behind the upper end of the upright rod 9d. The above-mentioned concave portion 12 on the surface is fitted, whereby the protruding shaft 13 is firmly fixed to the upper end portion of the upright rod 9d.

Preferably, the bottom end surface of the seat hole 14 is a spherical surface, which is complementary to the spherical surface of the front end portion 13 a of the protruding shaft 13 .

In addition, a protruding shaft 13 may protrude rearward from the side rear surface of the backrest 6, and seat holes 14 may be formed on the upper end front surface of each upright rod 9d of the back support rod 9 facing the protruding shaft.

If the backrest 6 is supported as described above, the backrest 6 can be supported only by making the anti-dropping pin 17 movably fitted with the shaft hole 15 provided at the front end of the protruding shaft 13, so that it can not only rotate around the axis facing the left and right direction, but also It can also be rotated by a predetermined angle in a direction deviating from the above-mentioned axis, so that the backrest 6 can be supported without expensive devices such as ball joints without causing inconvenience, and the seat occupant can feel comfortable.

Connect the part of the support 5 that is closer to the rear than the pivot 8 by the connecting rod 21 and the lower part of the backrest 6 that is higher than this part. The lower portion of the backrest 6 is pressed rearward with respect to the backrest support rod 9 .

That is, the front end portion of the connecting rod 21 is connected to the support 5 through the shaft 22 facing the left-right direction, and the rear end portion of the connecting rod 21 is connected to the lower end portion of the mounting metal fitting 23 protruding downward from the backrest 6 through the shaft 24 facing the left-right direction. Connected, the mounting metal part 23 is fixed on the lower end rear surface of the backrest 6 .

The connecting rod 21 is made of a rigid body whose center of curvature is positioned at the top (or below) of the connecting rod 21 and is arc-shaped in side view. It is sandwiched between two forward bars 9e, 9e, and is not easily exposed to the outside.

According to the above structure, as shown in FIG. 6, when leaning on, the backrest support rod 9 is tilted backward, and the connecting rod 21 is also tilted backward accordingly. At the center of rotation (shaft 22) of the connecting rod 21, the rear end of the connecting rod 21 presses the lower part of the backrest 6 backward, and the backrest 6 is centered on the axis facing the left and right direction (the anti-dropping pin 17) relative to the backrest support rod 9 , to the direction (upright direction) opposite to the direction of rotation (reclining direction) of the back support rod 9.

The seat support body 25 supports the seat 7 to adjust the front and rear positions, and the rear and front parts of the seat support body 25 are supported on the bearing 5 by the rear support device 26 and the front support device 27, so as to be compatible with the backrest support rod. 9, the rear part and the front part of the seat support body 25 are guided by the rear part support device 26 and the front part support device 27 in the manner of moving backward and downward respectively.

At the position of the support 5 that is more rearward than the pivot 8 of the back support rod 9 and more forward than the shaft 22 of the connecting rod 21, the upper end of the connecting rod 29 is pivotally mounted on the seat by the shaft 30 in the left and right direction. The rear part of the support body 25, wherein the lower end of the link 29 is pivotally mounted by the shaft 28 in the left-right direction, and the shaft 30 at the upper end of the link 29 is slidably fitted in a long hole generally facing the front-rear direction. 31, the elongated hole 31 is provided on the portion of each forward-facing rod 9e of the back support rod 9 that is more rearward than the shaft 28 at the lower end of the connecting rod 29, thereby constituting the rear support device 26.

The elongated hole 31 is provided on an upward protruding piece 9g provided on a portion of each forward-facing rod 9e of the backrest support rod 9 slightly rearward from the hexagonal hole 9f.

The shaft 32 facing the left and right direction is slidably fitted in the long hole 33 facing backward and downward, wherein the shaft 32 is arranged on the front part of the seat support body 25, and the long hole 33 is arranged on the support 5, thereby forming Front support device 27 .

A force is always exerted forward on the shaft 32 by a pressing device (not shown) provided in the support 5 .

In addition, the front part support device 27 may also adopt the following structure instead of the above structure, that is, as described in Patent Document 1, the upper end of the upward supporting link provided on the front part of the support and the connection between the seat and the seat may be used. The front is connected, and the support link can be tilted back (not shown).

According to the above structure of the chair, when the user leans against the backrest 6, the backrest 6 is elastically deformed so that the center part is recessed rearwardly compared with the side parts in plan view. At this time, the elastic deformation of the backrest 6 is allowed by the left and right anti-drop pins 17 moving slightly obliquely in the shaft hole 15 of the protruding shaft 13 .

In addition, the backrest support rod 9 and the backrest 6 together overcome the active force of the pressing device provided in the support 5 and tilt backward. At the same time, the connecting rod 21 tilts backward centered on the shaft 22 below it.

At this time, since the reclining angular velocity of the connecting rod 21 is greater than the reclining angular velocity of the backrest supporting rod 9, and the shaft 22 of the connecting rod 21 is located at a position more rearward than the pivot 8 of the backrest supporting rod 9, so using the connecting rod 21 The shaft 24 of the rear end presses the lower end of the backrest 6 to move backward. tilting direction) in the opposite direction (upright direction).

That is, when leaning on, even if the backrest support rod 9 tilts backward, since the backrest 6 is restrained from tilting backward, it maintains an upright state, so the user can maintain the comfortable posture of making the back tilt, and can use the backrest without hesitation. Keep your eyes and arms facing forward or down, and perform operations such as typing on the keyboard in a relaxed posture.

In addition, on the basis of the basic structure of conventional chairs, only a simple structure of connecting the lower part of the support 5 and the backrest 6 by the connecting rod 21 is added, so that the above-mentioned comfortable posture can be maintained, and operations such as typing on the keyboard can be easily performed. Therefore, there is no need to adopt a structure in which the backrest 6 itself can be bent in the front-rear direction in a side view, or the backrest 6 is supported by a complicated support structure, thereby simplifying the overall structure of the chair.

With the reclining of the back support rod 9, the shaft 30 is moved rearward and downward through the elongated hole 31 provided in the upward protruding piece 9g, thereby causing the link 29 to recline backward.

At this time, since the reclining angular velocity of the connecting rod 29 is greater than the reclining angular velocity of the backrest supporting rod 9, and the shaft 28 of the connecting rod 29 is located at a position more rearward than the pivot 8 of the backrest supporting rod 9, so the shaft 30 is toward the rear. The amount of movement is greater than the amount of movement to the rear of the elongated hole 31 of the backrest support rod 9, and the shaft 30 slides rearward in the elongated hole 31. At this time, the movement of the shaft 30 is used to make the rear of the seat support body 25 move to the rear and downward. .

That is, when the backrest support rod 9 is tilted backward, the above-mentioned structure can expand the movement stroke of the seat 7 rear portion to the rear, thus, when the backrest support rod 9 is tilted backward, the rear end of the connecting rod 21 is used to press the lower part of the backrest 6 to the rear. Move, the rear portion of the seat 7 then moves to the rear substantially, which can prevent the lower end of the backrest 6 from being separated from the rear portion of the seat 7, so that a comfortable seating feeling can be experienced.

The rear portion of the seat support body 25 is moved to the rear and downward through the shaft 30, and then the front portion of the seat support body 25 overcomes the active force of the pressing device arranged in the support 5, so that the shaft 32 at the front portion of the seat support body 25 moves along the long hole. 33 slides rearward and downward, whereby the front part of the seat support body 25 moves rearward and downward smoothly.

In this way, when the backrest support rod 9 was tilted backward, the lower end of the backrest 6 was pressed backward by the connecting rod 21, and the backrest 6 rotated relative to the backrest support rod 9 so as to maintain an upright state. 7. It can be moved back and down in a large way. When the user leans back, he or she will not hesitate to direct the eyes and arms to the front or front and down, and perform keyboard typing operations in a relaxed posture, so as to maintain a comfortable operating posture.

7 to 18 show a chair according to a second embodiment of the present invention.

In addition, the same reference numerals are used for the same or similar components as those of the first embodiment, and they are not shown, and detailed descriptions are omitted.

In the first embodiment, the backrest 6 is a plate member made of elastically deformable soft synthetic resin material, or covers the surface member with a buffer member sandwiched between the front surface thereof, while in the second embodiment, the backrest 36 It is a mesh tension structure.

As shown in Figures 10 to 12, the backrest 36 is provided with: a mesh-shaped tension member 37; and a frame body 39 as a backrest frame. The space portion 38 opened in the center of the frame body 39 .

The frame body 39 is composed of a synthetic resin strip-shaped frame member continuous in the outer peripheral direction, and is provided with a main frame 40 continuous in the outer peripheral direction that is generally square in front view. The main frame 40 includes: an upper horizontal frame portion 40A; A pair of left and right side vertical frame portions 40B, 40B having a desired reclining state; and a lower horizontal frame portion 40C.

As shown in FIG. 13 , the upper horizontal frame portion 40A forming a part of the peripheral edge of the main frame 40 has an arc-shaped curved surface whose front surface is inclined rearward and upward, has a cross-sectional shape whose wall thickness increases from the inner edge to the outer edge, and On the rear portion of the outer peripheral edge, an engaging groove portion 41 capable of engaging with the edge member 37a provided on the peripheral edge portion of the tension member 37 is provided along the left-right direction.

As shown in FIG. 14 , the cross-sectional shape of the outer edge side of the side vertical frame portion 40B is extended from the inner edge of the thick thick portion to the space portion 38 to form a thin thin portion, and On the outer edge portion, an engaging groove portion 42 communicating with the above-mentioned engaging groove portion 41 is provided along the up-down direction. The member 37a is engaged.

As shown in FIGS. 11 and 12, after leaving a part of the left and right ends, the lower horizontal frame portion 40C is divided into two in the thickness direction in the front-rear direction, and the rear surface side is used as the base portion 43. A part of the central portion in the left-right direction is cut off at a desired interval, and the opposite end portions 44a, 44a of the cut-out portion 44 are connected together by a connecting frame 45 installed so that its rear surface is opposed to the front surface of the base 43 , which becomes the cover portion on the front surface side.

On the central part of the left-right direction of the connecting frame 45, a fitting part 46 protrudes backward, and the fitting part 46 fits on the cutout part 44 of the above-mentioned base part 43. The width of the fitting part 46 is approximately equal to The distance between the opposite ends 44a of the cutout portion 44 in the initial state of the above-mentioned main frame 40 and the opposite surfaces of the 44a.

In addition, the rear end of the connecting rod 21 pivotally supported on the lower part of the frame body 39 forming the backrest 36 is mounted on the mounting metal part 23 via the shaft 24, and the mounting metal part 23 straddles the above-mentioned cut-out part 44. Between the opposite end portions 44a, 44a, it is fixed to the rear surface of the above-mentioned base portion 43.

Thereby, when leaning against the backrest 36 , the base 43 can be elastically deformed against the load applied to the center of the rear surface of the base 43 by the connecting rod 21 through the mounting metal fitting 23 .

A pair of left and right fixing parts 47, 47 are formed on the connection frame 45 from both ends on the front surface side of the fitting part 46 to the opposite end part 44a of the cutout part 44 of the above-mentioned base part 43. , 44a extends to the front surface side.

The rear surface of the fixing portion 47 abuts against the front surface of the opposite end portions 44a, 44a of the above-mentioned cutout portion 44, and is respectively fixed on the front surface of the base portion 43 across the opposite end portions 44a, 44a of the above-mentioned cutout portion 44. superior.

By assembling the base portion 43 and the connection frame 45 together, as shown in FIGS. 15 and 16 , the lower lateral frame portion 40C forms a hollow structure inside with a thicker cross-sectional shape, and in each hollow portion, the front and rear directions A plurality of ribs 48 , 49 are protrudingly provided, respectively, and the plurality of ribs 48 , 49 are arranged along the longitudinal direction in the up-down and left-right directions.

In addition, when the connecting frame 45 is assembled on the base 43 , the end of the rib 48 forms an abutting portion 48a abutting against the left and right end surfaces of the fitting portion 46 , and the rib 48 faces the opposite end of the cutout portion 44 of the base 43 . 44a, opposite faces of 44a.

Bolt through holes 50 are provided near the ribs 48 on the base 43 , and near the ribs 49 of the left and right fixing parts 47 of the connection frame 45 opposite to the bolt through holes 50 , multiple bolt holes are provided on the left and right via the fitting part 46 . A female threaded hole 51.

As shown in FIG. 15 , bolts 52 inserted through the bolt through holes 50 from the rear of the base 43 are screwed into these female threaded holes 51 , and the left and right fixing parts 47 on the connection frame 45 are fixed to the above-mentioned bolts 52 . on the base 43 .

In addition, the left and right fixing parts 47 on the connection frame 45 are divided into left and right parts, and a plurality of bolt through holes 53 are provided on these divided parts 47A, and female holes 53 opposite to the bolt through holes 53 are provided on the front surface of the base part 43 . The threaded holes 54 and the bolts 55 respectively pass through the bolt through holes 53 from the front and are screwed into the female threaded holes 54 , thereby fixing the divided portion 47A to the front surface of the base portion 43 .

In this way, by dividing the fixed portion 47 connecting the frame 45, when leaning against the backrest 36, the base portion 43 is easily elastically deformed relative to the load applied to the center of the rear surface of the base portion 43, stress concentration can be avoided, and the machining accuracy of the base portion 43 can be enlarged. the allowable range.

Near the female screw hole 51 on the connecting frame 45, a protruding portion 56 protruding backward is provided. As shown in FIG. The concave portion 57 is engaged.

On the rear surface of the fixing portion 47 of the connection frame 45, a groove portion 58 is formed, and by making the groove portion 58 face the front surface of the opposite end portions 44a, 44a on the cutout portion 44 of the base portion 43, the above-mentioned side longitudinal frame portion can The engagement groove 42 provided on 40B communicates with the engagement groove 46a provided on the lower surface of the fitting portion 46 respectively, and can engage the edge member 37a provided on the circumferential edge of the tension member 37 .

The edge member 37a provided on the peripheral edge of the tension member 37 is turned back in a winding manner from the front surface side of the main frame 40 to the rear, so that it is engaged with the peripheral edge of the main frame 40. The tension member 37 is stretched over the entire circumference of the front surface side of the frame body 39 on the groove portions 41 , 42 and the groove portion 58 , and closes the space portion 38 at the center of the frame body 39 .

Thus, the tension member 37 can be tensioned over the entire front surface of the frame body 39 in a stretched state, and since the entire front surface of the frame body 39 is covered by the tension member 37, it is stylish in design.

In addition, although it is preferable to weave high-tensile plastic or other elastic fibers into a net shape, or weave a net shape or a mesh shape to form the tension member 37, it is also possible to use only woven cloth, synthetic resin cover cloth and Porous cover cloth, etc.

The procedure for tensioning the tension member 37 on the frame body 39 will be described below.

First, in the state where the split portion 47A of the fixing portion 47 is left on the base portion 43 and the connection frame 45 is detached from the main frame 40, the left and right side vertical frame portions 40B of the main frame 40 are moved against the elastic force of the frame portion. As shown by the thin dashed-dotted line in FIG. 11 , elastic deformation occurs toward the contraction direction, that is, the direction in which the opposite end portions 44a, 44a of the cutout portion 44 of the base portion 43 approach each other.

In this state, the tension member 37 is folded back on the peripheral edge of the main frame 40 so as to be wound from the front side to the rear, and the edge member 37a provided on the peripheral edge of the tension member 37 is engaged with the The tension member 37 is attached to the peripheral edge of the main frame 40 in a stretched state in engaging grooves 41 , 42 , 46 a formed on the peripheral edge of the main frame 40 .

Next, the left and right side vertical frame parts 40B of the main frame 40 are expanded to the initial state by elastic force, and the rear surface of the connecting frame 45 is assembled to the front surface of the base part 43 under a state where a larger tension is applied to the tension member 37. Above, after fitting the fitting portion 46 of the connection frame 45 so that the left and right end faces thereof abut against the abutting portion 48a on the opposite surface between the opposite end portions 44a, 44a of the cutout portion 44, the bolts 52 are used to couple the connection. The left and right fixing parts 47, 47 on the frame 45 are fixedly connected so that the opposite end parts 44a, 44a of the cutout part 44 are connected to each other.

As a result, the tension member 37 can be tensioned efficiently without complicated processing, and the tension of the tension member 37 can be kept evenly spread over the entire frame body 39 .

In addition, in the case where the connecting frame 45 is fixed to the front surface of the base portion 43, for example, downward claws are provided on the upper edges of the rear surfaces of the fixed portion 47 and the divided portion 47A, and upward claws are provided on the lower edges of their rear surfaces, By engaging these claws with the front surface of the base 43 , it is also possible to effectively prevent the connecting frame 45 from shifting relative to the base 43 in the vertical direction.

The upper part of the back support rod 9 constituting the back support frame is pivotally supported and connected to the rear part of the frame body 39 .

That is, as shown in FIG. 10 , a pair of left and right projecting portions 59 are protrudingly formed rearward on the inner edges in the left and right direction of the left and right side vertical frame portions 40B of the main frame 40 , at substantially the middle position in the up and down direction. The protruding portions 59 face each other in the left-right direction, and protrude inward toward the space portion 38 .

As shown in Figure 8, in order to be driven by the leaning action of the backrest 36, the upper ends of the left and right upright rods 9d of the backrest support rod 9 are connected to the rear ends of the extensions 59, so that the upright rods 9d can rotate in a general direction. The axis in the left and right directions is rotated in all directions within a desired limit range so as to deviate from the above-mentioned axis by a predetermined angle.

In order to make the left and right extensions 59 match with the curved surface of the frame body 39 in a concave shape in plan view forward, the central axis of the left and right extensions 59 is inclined towards the inner front (refer to FIGS. 10 and 12 ), and in order to match the frame body 39 The reclining angles are matched so that the left and right overhangs 59 are tilted forward and upward (see FIG. 9 ).

As shown in Fig. 17 and Fig. 18, the protruding shaft 61 fixed by the fixing screw 60 is protrudingly arranged on the front surface of the upper end portion of the left and right upright rods 9d of the back support rod 9, and the front end of the protruding shaft 61 is set at the same time. A spherical sliding contact surface member 62 is formed through the sliding contact surface member 62 , and a shaft hole 63 generally facing the left and right direction is formed therethrough.

In the shaft hole 63 , tapered hole portions 64 , 64 are formed from the center portion of the sliding contact surface member 62 toward left and right sides, and the tapered hole portions 64 , 64 are gradually enlarged in diameter toward the outside.

On the other hand, a fitting hole 65 opening to the rear is provided on the protruding portion 59 of the side vertical frame portion 40B. A seat hole 66 is opened at the rear.

The sliding contact surface member 62 of the above-mentioned protruding shaft 61 is inserted into the seat hole 66 of the seat tube member 67 from the rear, and made to be in sliding contact. The left and right ends of the anti-loosening pin 68 are inserted and locked into the locking holes 69 provided on the left and right sides of the seat tube member 67 to connect the above-mentioned protruding shaft 61 and the seat tube member 67 .

A bolt shaft 70 facing forward is protruded from the front end of the seat tube member 67. The front end of the bolt shaft 70 passes through a through hole 71 and protrudes toward the front surface side of the protruding portion 59. The through hole 71 passes through the protruding portion. 59 at the bottom of the fitting hole 65, and screw the nut 72 onto the protruding shaft portion 70a from the front for locking, thereby firmly fixing the above-mentioned seat tube member 67 in the fitting hole 65 of the above-mentioned extension portion 59.

Thereby, the upper ends of the left and right upright rods 9d of the back support rod 9 are connected to the rear of the extension part 59 so as to be rotatable around the axis of the anti-dropping pin 68 and to be rotatable by a predetermined angle in a direction deviated from the axis.

Between the front surface of the upper end of the upright rod 9d and the rear end surface of the protruding portion 59, a cushioning member 73 is sandwiched. The cushioning member 73 is made of a soft elastic body such as synthetic rubber (elastomer).

The buffer member 73 can prevent the wear or damage of the connecting portion between the frame body 39 and the upper part of the back support rod 9 caused by long-term use of the chair.

The cap member 74 covers the connecting portion between the protruding shaft portion 70 a of the bolt shaft 70 exposed from the front of the extending portion 59 and the nut 72 from the front of the extending portion 59 to prevent the connecting portion from being exposed to the outside.

The cap member 74 is mounted on the front surface of the protruding portion 59 by pressing a fixing rod 75 protruding rearward from the inner center of the cap member 74 into a fixing hole 76 formed at the front end of the bolt shaft 70 .

Between the front surface of the cap member 74 and the rear surface of the tension member 37 tensioned on the front surface of the frame body 39, a gap a is provided to maintain a desired interval, even when the user's backrest 36 is leaned against. The tension member 37 is bent backward, and the above-mentioned gap a can be used to prevent the tension member 37 from contacting the cap member 74, or the elastic deformation of the cap member 74 can be used to maintain the buffering effect, so that the bolt shaft 70 and the nut 72 The connecting part between them will not directly contact the user's back.

The present invention is not limited to the above-mentioned embodiments, and the present invention can also be implemented in other modified forms.

Claims (11)

1. a chair, is characterized in that comprising:

Chair leg;

Bearing, is supported by described chair leg;

Seat, by described bearing support;

Back support bar, side-looking is L shaped substantially, described back support bar comprises: towards the erection part of top, towards the place ahead towards anterior and connect described erection part and described towards anterior bend is set, describedly towards anterior front portion, be arranged on described bearing;

Backrest, is supported by the erection part of described back support bar; And

Over cap, at least cover in described back support bar, the part from bend rear surface to lower surface,

Described erection part comprises pair of right and left up-and-down rod, and up-and-down rod is forked ground from described bend and extends upward described in pair of right and left,

Describedly towards front portion, comprise that pair of right and left is towards front bar, towards front bar from described bend, being forked ground described in pair of right and left forwards extends,

Described over cap comprises crooked covering part, upright covering part and covering part forward,

Described crooked covering part covers the rear surface of described bend, described upright covering part connection is arranged in described crooked covering part, and cover the rear surface of up-and-down rod described in each, described covering part forward connects and is arranged in described crooked covering part, and covers described in each lower surface towards front bar.

2. chair according to claim 1, is characterized in that, described over cap comprises bolster.

3. chair according to claim 1, is characterized in that, described over cap is made by soft synthetic resin material or rubber.

4. according to the chair described in any one in claim 1～3, it is characterized in that,

Described back support bar backsight is X-shaped,

Described crooked covering part covers the cross part of described X-shaped central authorities,

The transverse width of described crooked covering part is greater than described up-and-down rod and/or the described transverse width towards front bar, and described crooked covering part to be substantially dome shape ground rearward outstanding.

5. according to the chair described in any one in claim 1～3, it is characterized in that,

On the rear surface, described up-and-down rod upper end of described back support bar, also have recess, described recess is used for installing described backrest,

In described recess, press and embed flexible jut, described elastic protrusion portion is arranged on the upper end front surface of each upright covering part of described over cap.

6. chair according to claim 1, is characterized in that comprising:

In a part for the relative portion between described back support bar rear surface and described over cap front surface, be formed with space part,

At least corresponding with the described space part part of described over cap is formed by elastomeric material.

7. chair according to claim 1, is characterized in that comprising:

Described backrest comprises back frame,

Described back frame comprises: spatial portion, is configured in the central authorities of described back frame; And the framing component of band plate-like, tensioning is provided with for sealing the tensioner of described spatial portion,

Described chair also comprises pair of right and left extension, and on the basic centre position of above-below direction of described back frame left and right directions inside edge, extension is to stretch out to the inside along the relative mode of left and right directions described in pair of right and left.

8. chair according to claim 7, is characterized in that, described extension is rearward outstanding.

9. chair according to claim 7, is characterized in that, the top of described back support bar is arranged on the rear surface of described extension.

10. chair according to claim 9, is characterized in that, by the pivot towards left and right directions, the upper pivot of described back support bar is arranged on described extension, and the top of described back support bar can omnidirectional be rotated in the compass of regulation.

11. according to the chair described in claim 9 or 10, it is characterized in that, between described extension and the top of described back support bar, clamping has buffer component, and described buffer component comprises soft elastomer.

Images