JP5096869B2 - Chair - Google Patents

Description

  The present invention relates to a chair having a structure in which a backrest is attached to left and right back posts.

  There is a chair with a back, which is composed of a metal pipe or a bar (or die-cast product), and is widely used in, for example, conference rooms and lecture halls, offices, various stores, and various facilities (or homes). These types of chairs are often stored in a warehouse or the like when not in use, so that they can be placed side-by-side (nested) or (/ and) stacked (stacked) vertically. There are many that are.

  In this type of chair, the shape of the legs is various. For example, a type having four legs, forefoot and rear legs, as in Patent Document 1, and two left and right legs, as in Patent Document 2. Some types have The specific form of the four-leg system is also various, such as a type in which the front and rear legs are connected at the horizontal part at the upper part and the lower part as in Patent Document 1, the lower end of the leg is a free end, There is a type in which the upper end is connected to the upper horizontal part, or a type in which the left and right front legs and the left and right rear legs are connected to the lower horizontal part at the lower end.

  And in patent document 1 as a means to attach a backrest, while making a back leg protrude upwards and bending the rear end of an upper horizontal part upwards, it constitutes a back strut with which two became a pair, and both right and left sides of a backrest A cylindrical part opened downward is formed in the part, and this cylindrical part is fitted into the back column from above.

On the other hand, in Patent Document 2, a back strut is configured by projecting the upper end of a pipe foot above the seat, while mounting shaft portions inserted into the back strut are projected downward at the left and right ends of the backrest. The back column, the mounting shaft portion, and the cylindrical mounting portion of the support arm are fastened together with screws.
JP 2002-136389 A JP 2000-152845 A

Now, chairs may be provided with an auxiliary body such as an armrest or memo stand as an optional item. The mouse operating table of Patent Document 2 is also an example of an auxiliary body, and a downward load acts on these auxiliary bodies. In Patent Document 2, the support arm is screwed to prevent the mouse base from sliding down. However, in this configuration, all the load acting on the mouse base is received by the screw. There is a problem that the number of man-hours for assembling the chair is increased because it is necessary to ensure the strength by using it.

  This invention is made | formed in view of such the present condition, and makes it a subject to provide the chair improved more compared with the prior art.

The chair according to the present invention comprises a seat, a pair of left and right back struts extending upward from the seat through the left and right outer sides or the rear side of the seat, and a backrest provided with attachment portions to the back struts on the left and right side portions. The back support is provided with an upward boss body, and the mounting portion of the backrest is provided with a boss hole into which the boss body is fitted, or a downward boss body is provided in the mounting portion of the backrest The back strut is basically formed with a boss hole into which the boss body is fitted .

The invention of claim 1 is characterized in that, in the basic configuration described above , the height of the rear part of the auxiliary body on which the seated person's elbow or object can be placed and the height adjustment part are placed between the upper end surface of the back column and the attachment part of the backrest. Either one of the spacers is selectively disposed in a state of being fitted to the boss body, and therefore the backrest is supported on the upper surface of the back column via the auxiliary body or spacer, And the said auxiliary body was attached by setting the up-and-down height between the upper end of the said back support | pillar and the attachment part in the state which the said auxiliary body was fitted to the boss body, and the up-and-down height of the said spacer. The backrest is held at the same height in both the state and the unattached state.

  According to a second aspect of the present invention, in the first aspect, the back strut and the attachment portion of the backrest have substantially the same outer shape so that their outer peripheral surfaces can be smoothly continued. According to a third aspect of the present invention, in the first or second aspect of the present invention, the rear portion of the auxiliary body is formed with a large-diameter hole having a downward opening in which the upper portion of the back column fits tightly and a small-diameter hole through which the boss body passes. The outer portion of the small-diameter hole is an inward flange that overlaps the upper end surface of the back column.

  According to a fourth aspect of the present invention, in the first to third aspects, the boss body is provided in the back column, the boss hole is formed in a mounting portion of the backrest, and the auxiliary body and the spacer surround the boss body. While the rib protrudes upward, the auxiliary member and the annular rib of the spacer are fitted to the lower end portion of the attachment portion in the backrest.

  In the present invention, since the auxiliary body or the spacer overlaps with the upper end surface of the leg column, even if it is simply fitted, it does not slide down at all. Accordingly, only one screw is sufficient to provide the retaining screw, and as a result, the man-hour can be reduced in the assembly work of the chair. Further, in Patent Document 2, it is necessary to hold the support arm by hand so that the chair does not slide down when assembling the chair. From this point of view, assembling work increases, but in the present invention, the spacer is also fitted into the boss body. Therefore, the auxiliary body and the spacer need not be held by hand to hold the height at the time of mounting, and this can also contribute to the reduction of assembling work.

Then, in the present invention, when not using an auxiliary body of elbow etc. By fitting the spacer to the boss body is maintained with and without the high of the backrest the same in case of using the auxiliary body because It is possible to accurately cope with the option of the auxiliary body while standardizing the height of the chair to be constant.

If it comprises like Claim 2, there is an advantage which becomes a clean design and is excellent in aesthetics. According to the third aspect of the present invention , since the rear part of the auxiliary body is tightly fitted to the upper part of the back column, the moment applied to the auxiliary body can be mainly supported by the back column. The body can ensure high strength against load.

  Further, in the invention of claim 4, since the annular rib of the auxiliary body or the spacer performs a buffering action between the boss body and the backrest, even if a seated person leans on the backrest, even if a moment acts on the mounting portion of the backrest, the stress is applied. Concentration can be suppressed and high strength can be ensured.

(1). Basic Configuration of Chair Next, an embodiment of the present invention will be described based on the drawings. First, the basic configuration of the chair will be described with reference to FIGS. 1 is a perspective view of the whole, FIG. 2A is a front view, FIG. 1B is a plan view, FIG. 3C is a side view, and FIG.

The chair includes a leg 1, a back frame 2, a seat 3 and a backrest 4 as main elements, and the seat 3 and the backrest 4 are attached to the back frame 2. The leg 1 and the back frame 2 constitute a frame that receives a seating load and a backrest load. Moreover, the armrest 5 is attached to the back frame 2 as an example of the auxiliary body described in the claim.

  The back frame 2 is tilted backward in a side view, and is fixed to the upper end of the leg 1 (the leg 1 and the back frame 2 may be integrated). The seat 3 is disposed at a position above the leg 1 and is attached to a lateral support shaft 6 of the back frame 2 with a bolt (not shown) so as to be able to flip up and rotate around the rear portion (see FIG. 2 (A) (C)).

  The leg 1 has a left and right forefoot 7 and two left and right rear legs 8 and has a four-leg system. The lower ends (tips) of the legs 7 and 8 are in a vertical posture. A caster 9 is attached to the main body. The left and right front legs 7 and the left and right rear legs 8 have upper horizontal portions 7a and 8a, respectively. Therefore, the left and right front legs 7 and rear legs 8 are each formed in a substantially trapezoidal shape when viewed from the front.

  On the other hand, the back frame 2 has left and right back posts 2a in a substantially frontal vertical position located on the left and right outer sides of the seat 3, an inclined portion 2b continuous to the lower end thereof, and a lower horizontal portion where the left and right inclined portions 2b are integrally connected. For this reason, the back frame 2 is substantially U-shaped when viewed from the front (the back column can also be called a side column).

  The lower horizontal portion 2b of the back frame 2 and the upper connecting portions 7b, 8b of the legs 1 are integrally fixed in a bundled state. Upper horizontal portions 7 a and 8 a of the leg 1 are covered with a cover 10. The front and rear legs 7 and 8 are manufactured from pipes, but it is also possible to adopt a molded product such as an aluminum die-cast, and the entire leg 1 is made of an aluminum die-cast. It is also possible to have a single structure as a molded product, or to integrally form the leg 1 and the back frame 2.

Most of the forefoot 7 is tilted backward in side view and tilted outwardly from the top in front view, and most of the rear foot 8 is tilted backward in side view and in front view. The chairs are arranged side by side when the seat 3 is flipped up by making the left-right distance of the front foot 7 smaller than the left-right distance of the rear foot 8 overall. The legs 1 can be partially fitted and nested. The left and right inclined portions 2b of the back frame 2, receiving body 11 of the left and right horizontal supporting the front of the rotation center of the seat 3 is fixed by welding (receiving body 11, a chain line in FIG. 2 (C) It may be provided on the front leg 7 of the leg 1 as shown in FIG.

  The upper part of the back column 2a constituting the back frame 2 extends above the seat 3, and an elbow rest 5 and a backrest 4 are attached to the back column 2a. As can be understood from FIG. 3, the backrest 4 includes an outer shell (base body) 12 that functions as a strength member, a lower cover 13 that is attached to a substantially lower half of the front surface of the outer shell 12, and an outer shell. The upper cover 14 mounted on substantially the upper half of the front surface of 12 is configured as a main member.

(2). Mounting structure of the elbow rest Next, the mounting structure of the elbow rest 5 and the backrest 4 will be described mainly with reference to FIG. 4, (A) is a separated side view, (B) is a longitudinal side view in an assembled state, (C) is a view taken along the line CC of (A), and (D) is a D- of (A). D sectional drawing, (E) is a perspective view of the spacer 16, (F) is a vertical side view in the state which attached the spacer.

The back frame 2 is composed of a pipe (oval pipe) having an elliptical cross section, and has a long elliptical shape at the back strut 2a. As can be understood from FIG. 4 for example, fixed boss member 17 upper portion of the flat cross-section oval made of metal back posts 2a, is attached to the elbow 5 and the backrest 4 via the boss member 17 . The boss body 17 is welded to the upper and lower bushes 18 and 19 that fit exactly inside the back column 2a, and the upper bush 18 is welded to the inner surface of the back column 2a.

  The boss body 17 is smaller than the back strut 2 a in both the front-rear width and the left-right width. Therefore, the upper end surface of the back strut 2 a is a step on the outside of the boss body 17. The boss body 17 uses a solid bar, but a pipe can be used if the strength permits.

  The elbow rest 5 is a molded product made of a resin such as PP (polypropylene) and has a planar shape that is shifted to the left and right as it is closer to the front as shown in FIG. 2B (to avoid interference during nesting). Is also curved). Further, as shown in FIGS. 4A and 4B, the lower surface of the rear part has a forwardly inclined shape in a side view, and therefore, the rear part becomes thicker toward the rear end. This is to ensure strength. It is also possible to provide the elbow rest 5 with a metal reinforcing material that fits into the back column 2d and the boss body 17.

  At the rear part of the elbow pad 5, a large-diameter hole 20 that fits tightly into the back column 2a and a small-diameter hole 21 through which the boss body 17 passes are formed in communication. Accordingly, the portion around the small-diameter hole 21 is an inward flange 22 that overlaps the upper end surface of the back column 2 a, and an upward annular rib 23 that surrounds the boss body 17 is formed on the upper surface of the inward flange 22. As shown in FIG. 4C, the planar shape of the annular rib 23 is basically similar to that of the back column 2a, but the front part is notched (the notch part is indicated by reference numeral 23a). Therefore, the annular rib 23 is thicker at the rear part than at the front part. The reason why the notches 23a are provided in this manner is to make the thickness of the outer shell 12 before and after the attachment portion 12c as equal as possible.

(3). Structure of the backrest Next, the structure of the backrest 4 will be described with reference to FIG. 5A is a front view of the outer shell 12, FIG. 6B is a plan view of the outer shell 12, FIG. 6 is a sectional view taken along the left and right middle part of the backrest 4, and FIG. 7A is the backrest. 4 is a longitudinal sectional side view of FIG. 4, (B) is a sectional view taken along the line VII-VII of FIG. 5, and (C) is a sectional view taken along the line CC of (B). In FIG. 5, a spacer 16 is attached instead of the elbow rest 5.

The outer shell 12 constituting the backrest 4 is made of a relatively hard resin such as PP. Therefore, the outer shell 12 can be bent and deformed when a large load is applied, but is not essentially deformed by extension or compression. (This is to stably support the body of the person who is seated.) In addition, a large window hole 24 that is almost a horizontally long rectangle is formed in a substantially half portion of the outer shell 12, and therefore, the vertically long side frame portion 12 a and the top frame portion 12 b are continuous outside the window hole 24. It extends. The outer shell 12 is curved in a concave shape facing forward in plan view (to fit the human body), but the top frame portion 12 b is curved deeper than the portion below the window hole 24.

The outer shell 12 is curved to generally before facing concave in plan view, than the window holes 24 are in the portion below are vertical and horizontal ribs 25 are formed for reinforcement such as, the lower cover 13 is a rib 25 Is supported by a group of Like the outer shell 12, the lower cover 13 is made of a relatively hard resin such as PP, and a large number of horizontally elongated ribs 26 are formed on the front surface thereof at an appropriate interval in the vertical direction. The laterally long ribs 26 are mainly provided from the viewpoint of design, and thus have a protruding height (several mm) that does not give an uncomfortable feeling to the human body.

The upper cover 14 is made of a material that easily stretches and bends like an elastomer, and the left and right sides are fixed to the side frame 12 a of the outer shell 12. As shown in FIG. 5, the side frame portion 12 a of the outer shell 12 is formed with a longitudinal groove 27 that opens forward, while the upper cover 14 has a fitting portion that fits into the longitudinal groove 27 on the left and right side portions. (Not shown) protrudes rearward, and a reinforcing member (not shown) attached to the fitting portion is fixed to the side frame portion 12a with screws (not shown).

  As shown in FIGS. 5 and 6, the side frame portion 12a of the outer shell 12 is formed with a pedestal portion 28 with a hole into which the screw is fitted from the left and right inner sides, and the screw inserted from the inner side into the pedestal portion 28 is reinforced. It is screwed into a nut provided on the member.

  As shown in FIG. 6 and FIG. 7A, an overlapping portion 14 a sandwiched between the upper portion of the lower cover 13 and the outer shell 12 is formed at the lower end of the upper cover 14. It is pressed and fixed to the outer shell 12 via a presser fitting 29. The presser fitting 29 has a bowl-like shape with an opening upward and having a front plate and a rear plate. As can be understood from FIG. 7A, the overlapping portion 14a of the upper cover 14 is held from below by the presser fixture 29. Has been.

  Although not described in detail, a part of the rear plate of the presser fitting 29 is a nut portion that is fitted into a pocket portion 31 formed in the outer shell 12 from below and is held so as not to move forward. The presser fitting 29 and the overlapping portion 14a of the upper cover 14 are fixed to the outer shell 12 by screwing a screw penetrating into the nut portion. Although details are omitted, the lower cover 13 is attached to the outer shell 12 by fitting with the engaging claw engaging hole. In FIG. 6, one engagement claw 30 is displayed (a plurality of engagement claws are arranged on the left and right).

  Also, pocket-shaped nut holding portions 32 projecting rearward are provided integrally on the left and right side portions and the lower portion of the lower cover 13, and plate nuts 33 are inserted and set in the nut holding portion 32 from the left and right lateral directions. The left and right lower portions of the outer shell 12 form a receiving portion 34 that supports the nut holding portion 32 from below, and screws 35 inserted from below into the receiving portion 34 are screwed into the plate nut 33. For this reason, the lower cover 13 is firmly fixed to the outer shell 12 at the lower part.

Similarly to the lower cover 13, horizontally long ribs 26 are formed in multiple stages on the front surface of the upper cover 14. Therefore, a large number of horizontally long ribs 26 exist on the front surface of the backrest 4 at substantially equal intervals throughout the entire backrest 4. In addition, the upper cover 14 is gently curved in a forwardly concave shape to the same extent as the lower cover 13 in a state where no load is applied, and in this state, the upper end of the upper cover 14 and the top frame portion 12b of the outer shell 12 between, vacant large space, as shown in FIG. 7 (a).

When the seated person leans on the upper cover 14, the upper cover 14 is stretched and deformed against elasticity, thereby giving the person high fit and cushioning properties. The extension limit of the upper cover 14 is regulated by the top frame portion 12b of the outer shell 12, whereby the upper cover 14 can be prevented from being broken. Although horizontal ribs 26 of the upper and lower covers 13 and 14 is a strong design aspects, it has also contributed to the strength up.

  The upper cover 14 can be opaque, but a translucent material can also be used. The backrest 4 can be constituted by the outer shell 12 and the upper cover 14 without using the lower cover 13, and in this case, the horizontally long ribs 26 are formed directly on the outer shell 12.

  In the present embodiment, as shown in FIG. 8, it is possible to attach an inner shell 37 with a cushion 36 stretched to the outer shell 12 in place of the upper and lower covers 13 and 14. The lower half of the inner shell 37 has the same structure as the lower cover 13. On the other hand, an upper rib 37a is provided at the upper end of the inner shell 37 so as to protrude toward the top frame portion 12b of the outer shell 12, and there is a slight gap between the upper rib 37a and the top frame portion 12b in a non-sitting state. There is a gap. For this reason, the upper part of the inner shell 37 can be slightly deformed. It is possible to manufacture the outer shell 12 without the window hole 24 and receive the body only by the outer shell 12 or to put a cushion on the front surface of the outer shell 12.

(4) Mounting structure of the backrest 4 Next, the mounting structure of the backrest 4 will be described with reference to the previous drawings (particularly FIGS. 4, 5, and 7). A mounting portion 12 c that opens downward is formed on the left and right sides of the outer shell 12, and the mounting portion 12 c is fitted into the boss body 17.

  As shown in FIG. 7 (B), the mounting portion 12c is basically in the shape of an ellipse having the same longitudinal and longitudinal shape as the plan view outer shape of the back column 2a. For this reason, when the elbow rest 5 and the spacer 16 are not provided. The front and rear surfaces and the left and right outer surfaces of the attachment portion 12c can be continuous so as to be substantially flush with the back column 2a. Due to the sense of unity of the outer shape of the outer shell 12 and the back column 2a, a unified design for the entire chair is realized.

  As shown in FIG. 7B, the mounting portion 12c has a boss hole 39 into which the boss body 17 is fitted. In this case, the boss hole 39 has a copper bowl shape (or a bulky bulge shape) in plan view. The rib 40 which contacts the boss | hub body 17 from front and back, right and left is formed in the inner surface. The reason why the rib 40 is applied to the boss body 17 in this manner is to prevent stress from concentrating on a specific location due to a complicated force applied to the mounting portion 12c.

  The lower end portion of the boss hole 39 is a widened portion 39a into which the annular rib 23 of the elbow rest 5 is fitted, and there is little or no rib 40 at the location of the widened portion 39a. As shown in FIG. 4B, the boss body 17 is screwed with a set screw 42 inserted from the rear side into the mounting portion 12 c of the outer shell 12.

When the elbow rest 5 is not attached, the spacer 16 is attached to the boss body 17. Vertical height of the spacer 16 is essentially the same as the vertical height of the inward flange 22 of the elbow 5 and (thick), as shown in FIG. 4 (E), on the upper surface the same as the elbow 5 It is formed an annular rib 23 of the shape and height, and as shown in FIG. 4 (F), on the lower surface of the spacer 16, full extremely shallow skirt portion 16a fitted from the outside to the back posts 2a are formed ing.

(5) Summary Since the elbow rest 5 and the spacer 16 are both held by the back column 2a so as not to move downward, screws for preventing the elbow rest 5 and the spacer 16 from falling are not necessary. Further, the backrest 4 is mainly subjected to a backward load, and the upward load only works when the backrest 4 is gripped and the chair is lifted. Accordingly, the backrest 4 and the elbow rest 5 or the backrest 4 and the spacer 16 can be firmly fixed with only one set screw 42 on the left and right. Moreover, since the height of the spacer 16 is the same height as the annular rib 23 of the elbow rest 5, the height of the backrest 4 is the same in both the state where the elbow rest 5 is attached and the state where it is not attached. .

  When a person leans on the backrest 4, the backrest 4 is mainly subjected to a backward force. However, if the notch 23 a is formed in the front portion of the annular rib 23 as in this embodiment, the lower end of the mounting portion 12 c in the outer shell 12. Since the portion on the front side is thicker, there is an advantage that the load applied to the backrest 4 can be accurately supported.

  The boss body 17 itself can be welded to the back column 2a. However, when the bushes 18 and 19 are used as in this embodiment, there is an advantage that the boss body 17 can be firmly fixed while being accurately positioned. In particular, when two upper and lower bushes 18 and 19 are used, the depth at which the boss body 17 enters the back column 2a can be increased without increasing the overall weight of the bushes 18 and 19, thereby ensuring high strength.

  Since a back load is applied to the backrest 4, it is excellent in terms of support strength that the mounting portion 12c of the outer shell 12 is long in the front-rear direction. The boss body 17 may be circular (perfect circle). However, if the boss body 17 has a cross-sectional shape that is oblong (or oval) long in the front and rear as in the present embodiment, The thickness can be made long and long before and after equalizing the thickness as much as possible.For this reason, it is possible to prevent or suppress the occurrence of sink marks at the time of molding due to the difference in thickness, and to ensure strength by dispersing stress. Can contribute.

  In the present invention, the backrest 4 has a portion between the mounting portions 12c of the left and right outer shells 12 protruding downward. In other words, the left and right attachment portions 12c in the outer shell 12 are located above the lower end of the backrest 4 (or the outer shell 1). With such a configuration, it is possible to suppress the backrest load from acting as a moment on the attachment portion 12c and contribute to an increase in strength.

  That is, in Patent Document 2, the left and right mounting shaft portions protrude downward from the lower end of the entire backrest. Therefore, the backrest is in a so-called cantilever state. As a result, the load applied to the backrest is affected by the mounting shaft. In this embodiment, since the backrest 4 extends below the mounting portion 11c, the upper and lower spans are shortened even when the moment is applied. As a result, the backrest is reduced. The supporting strength against the load increases.

(6). Others The present invention can be embodied in various ways other than the above embodiment. For example, the structure and form of the legs and backrest can be arbitrarily set. It is also possible to provide a boss body on the backrest. Further, it goes without saying that the present invention can be applied to a type in which the seat does not flip up and rotate.

It is a perspective view of the chair concerning a 1st embodiment. (A) is a front view, (B) is a plan view, and (C) is a side view. It is a separation front view of a chair. (A) is a separated side view of the main part, (B) is a vertical side view of the main part in the assembled state, (C) is a CC view of (A), and (D) is D of (A). -D view sectional drawing, (E) is a perspective view of a spacer, (F) is a vertical side view with the spacer attached. (A) is a front view of an outer shell, (B) is a top view of an outer shell. It is a separation sectional view in the part of the right-and-left middle part of a backrest. (A) is a longitudinal side view of the backrest 4, (B) is a sectional view taken along the line VII-VII of FIG. 5, and (C) is a sectional view taken along the line CC of (B). It is a vertical side view of a cushion type backrest.

1 leg 2 back frame 2a back support 3 seat 4 backrest 5 elbow rest 12 outer shell 12c constituting the backrest 13 a lower cover constituting the backrest 14 upper cover constituting the backrest 16 spacer 17 boss body 22 inward facing of the elbow rest Flange 23 Annular rib 39 Boss hole

Claims (4)

A seat, a pair of left and right back struts extending upward from the seat through the left and right outer sides or the rear side of the seat, and a backrest provided with attachment portions to the back struts on the left and right sides ,
Before xenon or in the mounting portion of the backrest is provided upward of the boss member to the strut providing the full boss hole the boss body is fitted, or to the back strut by providing a downward boss member to the attachment portion of the backrest Is a configuration provided with a boss hole into which the boss body is fitted ,
Between the upper end surface of the back column and the attachment portion of the backrest, either the rear part of the auxiliary body on which a seated person's elbow or an object can be placed and the height adjusting spacer fit into the boss body. Are arranged selectively, so that the backrest is supported on the upper surface of the back column via the auxiliary body or spacer,
And the said auxiliary body was attached by setting the up-and-down height between the upper end of the said back support | pillar and the attachment part in the state which the said auxiliary body was fitted to the boss body, and the up-and-down height of the said spacer. The backrest is held at the same height in both state and unattached state,
Chair. The mounting portion of the back column and the backrest has substantially the same outer shape so that the outer peripheral surfaces of each other can be smoothly continued.
The chair according to claim 1. At the rear of the auxiliary body, a large-diameter hole with a downward opening in which the upper portion of the back column fits tightly and a small-diameter hole through which the boss body passes are formed, and the outer portion of the small-diameter hole is the upper end surface of the back column It has an inward flange that overlaps with
The chair according to claim 1 or 2. The boss body is provided in a back column, and a boss hole is formed in a mounting portion of a backrest, and an annular rib surrounding the boss body is protruded upward from the auxiliary body and the spacer, while the backrest is The auxiliary body and the annular rib of the spacer are fitted to the lower end portion of the mounting portion,
The chair as described in Claims 1-3.

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