JP2009106423A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a four leg type nesting chair which makes legs hardly hinder a person and enables a seat to be easily turned. <P>SOLUTION: Legs 1 are constituted of front legs 7 and rear legs 8 and the respective legs 7, 8 are inclined in both front and side views. The front and rear legs 7, 8 are continuous to converging portions 7c, 8c, a U-shaped back frame 2 stand upward from the converging portions 7c, 8c of the legs, and the seat 3 and the backrest 4 are attached to the back frame 2. The seat 3 is coupled to the back frame 2 so as to be able to swing up to turn around the rear portion of the same. A stopper 18 supporting the seat 3 in a reclined posture is arranged in the back frame 2. The back frame 2 and the legs 1 converge towards the space under the seat 3 thus it is possible to suppress collision with bags or others of passers passing the sides or backs of the same. The seat 3 can be turned even by touching any part of the periphery of the same by hands. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a non-rotating chair having a four-legged leg, and particularly suitable for a chair of a type that can be fitted side by side when the seat is flipped up and rotated. .

  A chair with a backrest having four legs is widely used in offices, various stores, and various facilities (or homes) including, for example, conference rooms and lecture halls. This type of chair is often stored in a warehouse or the like when not in use, and therefore, many of them can be fitted in the front-rear direction (nesting) or (and / or) stacked up and down (stacking). An example of a chair that can be nested is disclosed in Patent Document 1.

In Patent Document 1, the front, rear, left and right legs of the front and rear legs are tilted rearward and the rear legs forwardly tilted in a side view, and the upper ends of the left and right front and rear legs are integrally connected by an upper horizontal portion (therefore, accordingly). The legs are in the form of a trapezoid in side view). Further, the left and right upper horizontal portions are integrally connected by a horizontally long stay at a portion near the front portion. The two hind legs have an upward extension projecting upward from the seat, and the seat and the backrest are attached to the upward extension via a bracket. The seat is supported by the upper horizontal part of the leg when tilted horizontally. Further, by narrowing the left-right distance between the two front legs to the left-right distance between the two rear legs, the nesting can be performed by flipping the seat.
Japanese Patent Laid-Open No. 2001-128776

  As described above, four-leg chairs are often used in a wide space, such as a lecture hall, vertically and horizontally, but in the type of Patent Document 1, each leg is seated in a plan view and a front view. Since it is located near the left-right end and extends to the lower surface of the seat, there is a possibility that the legs of the chair are considerably conspicuous and give a person a feeling of pressure.

  In addition, because the legs of the legs extend to the lower surface of the seat, when a person carrying a bag or bag passes by the side of the chair, the problem is that the bag or bag tends to hit the upper part of the foot. There is a problem that the legs and rods are easily caught on the rear legs or front legs of the chair when moving sideways, or the rear legs of the front chair gets in the way of a person sitting.

  Furthermore, while a person is seated, the person may take a posture in which the right and left edges of the seat are gripped and the arm is stretched. However, in Patent Document 1, the upper horizontal portion of the leg is in close contact with the lower surface of the seat. However, there was a risk of touching the horizontal part of the leg and making people feel uncomfortable. Also, when flipping up the seat, you must put your hand on the front part of the chair in front of the upper horizontal part of the leg. The front end of the seat must be held so as not to be pinched, and there is a problem that the rotation operation of the seat is troublesome.

  The present invention has been made in view of such a current situation, and intends to provide a four-legged chair having a more improved form and structure.

  The chair according to the present invention includes a seat, a backrest, legs and a back frame as main elements. The leg has four front and rear, right and left legs and a converging portion where the four legs gather at the upper end, and each leg is outward as it goes from top to bottom in front view and side view. Inclined or curved so as to expand, and further, a back frame extends upward from the convergence portion of the leg, and a seat and a backrest are attached to the back frame, and the seat and the convergence portion of the leg There is a gap between them.

  The present invention can be developed in various ways, and examples thereof are shown in claims 2 and 3. Of these, the invention according to claim 2 is the invention according to claim 1, wherein the converging part of the leg extends in the left-right direction when viewed from the front, so that it converges with the two left and right forefoot and the converging part and the two right and left hind legs. Each part has a substantially trapezoidal shape when viewed from the front, and further, a reverse V shape is formed between the forefoot and the rear foot when viewed from the side. While the legs of the chairs arranged side by side are allowed to fit each other by narrowing or widening over the entire height with respect to the left and right spacing of the legs, the back frame rises from the converging part and rises from the left and right sides of the seat The side struts that extend upward through and tilted rearward in a side view, and are connected to the left and right side struts so that the seat can be flipped up around the rear, so that the rear of the seat Protruding behind the back frame That.

  According to a third aspect of the present invention, in the first or second aspect, the left and right front legs and the left and right rear legs are integrally connected via a converging portion that is horizontally long in a front view. The back frame has a horizontally horizontal lower horizontal part and is formed in a front U-shape or an upward opening U-shape. The converging part of the foot and the lower horizontal part of the back frame are fixed together as a bundle.

  In the present invention, the shape (or posture) in which the foot is inclined or curved is specified. This is because the entire height of the foot is inclined or curved, and the majority is inclined or curved. The lower part of the foot is in a vertical posture, as can be understood from the embodiment, including the case where it is curved and the case where a substantial part (half or more) of the total height is inclined or curved. It doesn't matter.

  In the present invention, the space between the leg and the seat is spaced, and the legs constituting the leg are spread outward from the top to the bottom, so that the portion around the seat and each leg There is a considerable space between them and the presence of this space makes it refreshing without giving a person a feeling of pressure or cramping, and when a person passes by the side or behind the chair, It is possible to prevent or remarkably prevent moss from hitting or catching on the chair's legs, and the legs hit the front chair legs while the chairs are placed side by side with the chair crossed This can also be suppressed. In other words, the problem that the legs of the chair get in the way of people can be remarkably improved.

  In addition, since the space around the seat is open except for the attachment point with the back frame, even if a person is seated, the right and left edges of the seat can be grasped and the arm can be stretched. The hand does not hit the leg, so there is no problem that makes the person feel uncomfortable. In the same way, it is possible to reach any part of the seat frame except when it is flipped up or down, greatly improving the ease and safety of the seat rotation operation. Can be made.

  According to the second aspect of the present invention, the chair can be nested in the front-rear direction by flipping up the seat, but the front and rear legs constituting the leg are inverted V-shaped in a side view, so that the front and rear chairs are fitted. The depth can be increased, and as a result, the space saving of the storage place can be improved. In addition, because the rear part of the seat protrudes behind the side post of the back frame (overhangs), at least the part of the side post where the seat is attached is located on the left and right outside of the seated person's waist, For this reason, it is in the state where the body is wrapped, and the effect which gives a sense of stability to a person can be exhibited.

  In the present invention, the entire framework composed of the legs and the back frame is manufactured as an integrally molded product by die casting or resin molding, or the legs are fixed as a whole to the leg frame and the back frame is fixed (fixed) thereto. However, if the structure of claim 3 is adopted, the framework of the chair will be composed of three members, a front foot part, a rear foot part, and a back frame. Since pipes can be easily manufactured as the main material, it can contribute to cost reduction of manufacturing equipment and weight reduction of chairs.

  Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 6 show a first embodiment (main embodiment), and FIGS. 7 and 8 show other embodiments. Hereinafter, the first embodiment will be described sequentially.

(1). Structure of the chair according to the first embodiment First, an outline of the chair according to the first embodiment will be described based on FIGS. 1A is a front view, FIG. 2B is a plan view, FIG. 3C is a side view, FIG. 3 is a bottom view, and FIG. 4 is a side view showing a nesting state. 5 is a separated front view.

  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. Further, an armrest 5 as an optional product is also attached to the back frame 2. The back frame 2 is fixed to the upper end of the leg 1, and the seat 3 is attached to the back frame 2 so that the seat 3 can be flipped up around the rear part at a position above the leg 1. Therefore, a space 6 having a certain size (for example, about several centimeters to 10 centimeters) is vacant between the upper end of the leg 1 and the seat 3 in the tilted state.

  The leg 1 has two left and right front legs 7 and two right and left rear legs 8. The upper ends of the legs 7 and 8 are horizontal portions 7a and 8a, and the lower ends are lower vertical portions 7b and 8b. A caster 9 is attached to the vertical portions 7b and 8b at the lower ends (tips) which are free ends. Yes.

  Most of the forefoot 7 excluding the upper horizontal portion 7a and the lower vertical portion 7b is in a tilted posture that extends backward from the side in a side view and from the top to the bottom in a front view. The front foot 7 is in the shape of a letter C in front view. Further, most of the rear foot 8 excluding the upper horizontal portion 8a and the lower vertical portion 8b is inclined backward in a side view and inclined outwardly from the top to the bottom in a front view. The left and right hind legs 8 are in the shape of a letter C in front view (or rear view). Therefore, as can be understood from FIG. 3, the legs 7 and 8 extend substantially in the radial direction in plan view (or bottom view).

  The left and right front feet 7 and the left and right rear feet 8 are integrally connected (coupled) via converging portions 7c and 8c including upper horizontal portions 7a and 8a, respectively (the connection structure will be described later). The part 7c and the converging part 8c of the rear foot 8 are fixed in close contact with each other. Therefore, the front foot 7 and the rear foot 8 form a V shape (or a dogleg shape) in a side view. A cover 10 is provided on the convergence portions 7c and 8c.

  Each foot 7 and 8 is made of a metal pipe whose one end and the other end are straight and mostly tapered, and the tapered portion and the large-diameter straight portion are crushed into an ellipse and deformed. ing.

  For example, as apparent from FIG. 2 (A), the distance between the front legs 7 is smaller than the distance between the left and right legs of the rear legs 8 as a whole. Since the distance between the front legs 7 is smaller than the distance between the rear legs 8 as described above, a number of chairs can be nested back and forth as shown in FIG. That is, the front foot 7 of the chair positioned at the back can be fitted between the left and right rear feet 8 of the chair positioned at the front.

  The distance between the front and rear chairs in the nesting state (nesting pitch) is defined by the contact between the seat 3 and the backrest 4 of the front and rear chairs. Nesting is also possible by making the left-right distance of the front foot 7 larger than the left-right distance of the rear foot 8, but in terms of ensuring stability when the seated person is leaning against the backrest 4, It can be said that it is preferable that the left-right distance of 8 is larger than the left-right distance of the front foot 7.

  The back frame 2 has two side struts 2a disposed on the left and right outer sides of the seat 3, an inclined portion 2b continuous to the lower ends thereof, and a lower horizontal portion 2c continuous to the inclined portion 2b. The shape is U-shaped when viewed from the front (the inclined portion 2b can be thought of as a part of the side column 2a). The back frame 2 is composed of a pipe (oval pipe) having an elliptical cross section, and has an elliptical shape that is long in the front-rear direction at the side column 2a.

  The back frame 2 is tilted backward as viewed from the side, and the lower horizontal portion 2c is fixed to the converging portions 7c, 8c of the front and rear feet 7, 8 by welding (the specific structure will be described later). Further, a support pin 11 protrudes upward from the upper ends of the left and right side columns 2 a in the back frame 2, and the armrest 5 and the backrest 4 are attached using the support pin 11.

  The backrest 4 includes an outer member (outer shell) 12 fitted and mounted on the support pin 11, a lower cover 13 that covers a substantially lower half of the front surface of the outer member 12, and a substantially upper half of the front surface of the outer member 12. The upper cover 14 to be covered is a main member. A large window hole 15 is formed in the upper half of the outer member 12, while the upper cover 14 is made of an elastomer material that can be easily extended and deformed by a rearward load, thereby providing high cushioning to a seated person. it can. There is a gap between the upper end of the outer member 12 and the upper cover 14 to allow the upper cover 14 to extend and deform (the elongation deformation of the upper cover 14 is restricted by the upper end of the outer member 12. )

  The outer member 12 and the lower cover 13 are made of resin such as PP, and the lower cover 13 is basically not deformed by a backrest load. It should be noted that a structure in which a cushion is stretched on a resin inner shell without using the upper and lower covers 13, 14, only the upper cover 14 is attached to the outer member 12 without using the lower cover 13, or It is also possible to make the outer member 12 in a form in which the window hole 15 does not exist and to put a cushion on the outer member 12.

  Opposite lateral support shafts 16 project from the lower ends of the left and right side columns 2a. On the other hand, the seat 3 has an outer cover 17 that constitutes a lower surface thereof, an inner shell (not shown) with a cushion on the upper surface, and a ring-shaped annular metal disposed between the outer cover 17 and the inner shell. A reinforcing frame (core member) is provided, and the reinforcing frame is coupled to the lateral support shaft 16 by bolts or the like.

  That is, the reinforcing frame functions as a strength member that supports the load caused by the seating, and the outer cover 17 mainly functions as an inner shell attaching function and a cosmetic function that hides the reinforcing frame and the like. The outer cover 17 has a hole that allows the lateral support shaft 16 to pass therethrough. In addition, as a mounting structure of the seat 3, a support shaft inserted from the outside into the side column 2a can be fitted into the seat 3.

  The rear part of the seat 3 is connected to the side column 2a. Therefore, the rear part of the seat 3 partially protrudes behind the side column 2a. It protrudes backward from a certain part of the shaft 16). A stopper 18 that supports the seat 3 from below is fixed to the left and right inclined portions 2b of the back frame 2 by welding before the pivot point. For example, as can be understood from FIG. 2, the stopper 18 has a horizontally long posture as a whole, and supports the seat 3 with a certain right and left length. Although details are omitted, it is considered that the reinforcing frame is supported by the stopper 18 via the outer cover 17.

  In addition, the structure and connection aspect of the seat 3 can be set arbitrarily. For example, a bracket that is long in the front-rear direction can be rotatably connected to the side column 2a, and the seat 3 can be supported by this bracket. In addition, the stopper 18 that supports the seat 3 in the tilted position can be provided on the forefoot 7 as shown by a one-dot chain line in FIG.

  A specific structure of the converging portions 7c and 8c of the front and rear feet 7 and 8 is shown in FIG. 6A is a front view, FIG. 6B is a separated front view, and FIG. 6C is a sectional view taken along the line CC of FIG. 6A. As shown in FIG. The left and right rear legs 8 are integrally connected to each other by a horizontal shaft 19, penetrates the horizontal shaft 19 to the auxiliary plate 20 and is fixed by welding, and the auxiliary plate 20 and the lower horizontal portion 2 c of the back frame 2. Are fixed together by welding.

  The shaft 19 is fixed by welding to a bush 21 fitted and welded to the upper horizontal portions 7a and 8a of the legs 7 and 8. Therefore, in this embodiment, the converging portions 7c and 8c of the front foot 7 and the rear foot 8 are constituted by the upper horizontal portions 7a and 8a, the horizontal shaft 19, the auxiliary plate 20, and the bush 21. The horizontal shaft 19 and the auxiliary plate 20 are covered with the cover 10, and the cover 10 circumscribes the auxiliary plate 20. The upper horizontal portions 7a and 8a of the front and rear feet 7 and 8 and the upper horizontal portions 7a and 8a of the front and rear feet 7 and 8 and the lower horizontal portion 2c of the back frame 2 are fixed by welding. Is also possible. It is also possible to provide a block body in place of the auxiliary plate 20.

  Moreover, it is also possible to manufacture the left and right forefoot 7 and the converging part 7c, and the left and right rear leg 8 and the converging part 8c, respectively, as a single body with one pipe. That is, the front foot 7 and the rear foot 8 can be structured like the back frame 2. In this case, the converging portion that is continuous with the left and right forefoot 7 and the left and right rear foot 8 and the lower horizontal portion 2c of the back frame 2 may be secured together. The converging part 7c of the front foot 7 and the converging part 8c of the rear foot 8 are obtained by superimposing the lower horizontal part 2c of the back frame 2 on one core member, and using the converging parts 7c, 8c and the lower horizontal part 2c as core members. It is also possible to fix with bolts or welding.

(2) Summary of First Embodiment Since there is a space between the leg 1 and the seat 3 and the legs 7 and 8 constituting the leg 1 are inclined in front view and side view, The occupied space of the volume of 1 is much smaller than that of Patent Document 1, so that it is possible to remarkably suppress a person from feeling pressure or tightness. Moreover, since the large space 6 is vacant between the left and right side portions of the seat 3 and the leg 1, it is possible to remarkably suppress the phenomenon that the moss is caught on the legs 7 and 8 when a person passes by the side of the chair.

  Further, the back frame 2 and the rear foot 8 are in the shape of a dogleg when viewed from the side, so that there is a large space between the seat 3 and the rear foot 8, so that the rows and rows of chairs It is possible to remarkably prevent the moss from hitting or catching on the hind legs 8 when a person passes between them.

  By the way, when a person sitting on the chairs arranged in the front and back forms legs, the upper leg is positioned at the right end or the left end of the back part of the front chair. The shoe often hits the rear leg of the chair positioned in front, and thus there is a problem that it is difficult for a person sitting on the chair in the second row or later to assemble his / her legs. Since there is a large space between them and the rear legs 8 are in a forward leaning posture, a person sitting on a chair in the second and subsequent rows can easily assemble their legs. This is also an advantage of the present embodiment (the present invention).

  Since the seat 3 is located inside the left and right side columns 2a, as shown in FIG. 4, when the seat 3 is flipped up, the rear portion of the seat 3 is in a downward posture. Therefore, care must be taken so that the back frame 2 does not interfere with the raised seat 3. As shown in FIG. 2B, the rear portion of the seat 3 is curved outwardly in plan view, while the back frame 2 has an inclined portion 2b and is substantially U-shaped in front view. For this reason, the lower part of the back frame 2 can be made to enter the lower part of the seat 3 without hindering the flip-up rotation of the seat 3, so that when the person passes the side of the chair, It is also possible to suppress hitting the lower part of the back frame 2.

  In the present embodiment, the converging portions 7c, 8c of the front and rear feet 7, 8 and the lower horizontal portion 2c of the back frame 2 are bundled. However, according to this embodiment, the upper portion of the leg 1 is neat and compact. Because it is excellent in aesthetics. This is also an advantage of this embodiment.

(3). Second to fourth other embodiments (FIG. 7)
In FIG. 7, 2nd-4th embodiment which is another example of the leg 1 is shown. Of these, the second embodiment shown in (A) is such that the front foot 7, the rear foot 8, and the back frame 2 are integrated via one converging portion 23. That is, the front foot 7, the rear foot 8, and the back frame 2 integrally extend from the convergence portion 23 with one convergence portion 23 as a common element. In this embodiment, the framework composed of the legs 1 and the back frame 2 is an integral product, and specifically, it can be manufactured by aluminum die casting or resin injection molding.

  In the third embodiment shown in FIG. 7B, the front foot 7 and the rear foot 8 are formed as an integrally molded product via a common converging portion 24, and the back frame 2 is fixed to the converging portion 24. As fixing means, a block-like boss body 25 is integrally fixed to the lower horizontal portion 2c of the back frame 2 by welding or the like, and the boss body 25 is fitted into a positioning hole 26 formed in the converging portion 24 to be fitted to the boss body 25. And the converging part 24 are fastened with bolts 27. The converging part 24 and the lower horizontal part 2c can also be integrated by welding.

  In the fourth embodiment shown in FIG. 7C, a base body 29 is manufactured in which the lower part 2d of the back frame 2 and the upper parts 7d and 8d of the front and rear legs 7 and 8 are integrally provided on one common converging part 28. In addition, the side column 2a of the back frame 2 and the front and rear legs 7 and 8 are fitted and mounted on the base body 29. Therefore, in this embodiment, the leg 1 and the back frame 2 are partially integrated.

  The base body 29 is, for example, an aluminum die-cast product, and a boss body 30 for attaching the side column 2a and the legs 7 and 8 is integrated with the lower part 2d of the back frame 2 and the upper parts 7d and 8d of the front and rear legs 7 and 8, respectively. Is formed. The side column 2a and the legs 7 and 8 are made of pipe. The stopper 18 is manufactured as a separate member and welded.

(4). Fifth to sixth embodiments (FIG. 8)
In FIG. 8, the 5th-6th embodiment which is a modification of the framework of a chair is shown. Of these, (A) is a schematic front view of the fifth embodiment, and (B) is a schematic side view of (A). In this embodiment, the feet 7 and 8 are viewed in front and side views. It is characterized in that it has an arcuate shape. The left and right front feet 7 and the left and right rear feet 8 are integrally connected via converging portions 7c and 8c, respectively.

  The legs 7 and 8 can be curved in a side view and linearly inclined in front, or can be curved in a front view and linearly inclined in side view. Alternatively, it is possible to arbitrarily combine the linear inclined shape and the curved shape, for example, the rear foot 8 is curved and the front foot 7 is linearly inclined in a side view.

  (C)-(E) has shown 6th Embodiment, (C) is a typical front view of 6th Embodiment, (D) is a side view of (A), (E) is typical. It is a fragmentary perspective view. In this embodiment, the left front foot 7 and the rear foot 8 and the right front foot 7 and the rear foot 8 are integrally connected to each other via the upper horizontal portion 31 in the longitudinal direction, while the back frame 2 is viewed in plan view. A U-shaped lower base frame 32 is provided, and the upper horizontal portion 31 of the leg is fixed (or fixed) to the side member 32a of the lower base frame 32 by welding or bolt fastening.

  Therefore, in this embodiment, the upper horizontal portion 31 of the leg 1 and the lower base frame 32 of the back frame 2 constitute a converging portion. A stopper 18 and a reinforcing bar 33 are fixed to the lower base frame 32 of the back frame 2 by welding.

(5). Others The present invention can be embodied in various ways other than the above embodiment. For example, the back frame can be formed in a ring shape in front view to stretch the net. It is also possible to make the seat a net structure. The converging part means a part where the front legs, the rear legs, and the back frame are gathered, and therefore various forms can be adopted. For example, the converging part can be circular or quadrangular in plan view.

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 bottom view of a chair. It is a side view which shows a nesting state. It is a separation front view of a chair. It is a figure which shows the connection structure of a framework. It is a figure which shows 2nd-4th embodiment. It is a figure which shows 5th-6th embodiment.

Explanation of symbols

1 leg 2 back frame 2a side column 2c lower horizontal part 3 seat 4 backrest 6 space between seat and foot 7 forefoot 7c, 8c, 23, 24, 28 converging part 8 hind leg 16 lateral support shaft 18 stopper

Claims (3)

The seat, backrest, legs and back frame are the main elements.
The leg has four legs, front and rear, right and left, and a converging portion where the four legs gather at the upper end, and the legs spread outward as they go from top to bottom in front view and side view. Inclined or curved
Furthermore, a back frame extends upward from the convergence portion of the leg, a seat and a backrest are attached to the back frame, and a gap is provided between the seat and the convergence portion of the leg.
Chair. The converging part of the leg has a form extending in the left-right direction when viewed from the front. For this reason, the front left and right forefoot and the converging part and the left and right two hind legs and the converging part each form a substantially trapezoidal form in front view In addition, an inverted V shape is formed on the forefoot and the rear foot in a side view, and the left and right distance between the two front legs is narrowed or expanded over the entire left and right distance between the two rear legs. Allows the legs of the chairs arranged in front and back to fit together,
The back frame rises from the converging part, extends upward through the left and right outer sides of the seat, and has side posts that are tilted backward in a side view, so that the seat can be flipped up around the rear part. It is connected to the side struts, so the rear part of the seat protrudes behind the back frame.
The chair according to claim 1. The left and right front legs and the left and right hind legs are connected together through a converging portion that is horizontally long when viewed from the front. For this reason, the front and rear legs are combined with the converging portion to form a substantially trapezoidal shape when viewed from the front. While
The back frame has a horizontally horizontal lower horizontal part and is formed in a substantially U-shaped front or an upwardly open U-shape, and the converging part of the front and rear legs and the lower horizontal part of the back frame are bundled together Fixed together,
The chair according to claim 1 or 2.

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