JP4792288B2 - Chair - Google Patents

Description

  The present invention relates to a rocking chair in which a backrest is supported by a frame structure.

  In a chair with a backrest, the elasticity of the frame structure to which the backrest and the seat are attached is used as a means to provide a locking function that tilts the backrest backward when a seated person leans on the backrest. . One example thereof is described in Patent Document 1.

  That is, in Patent Document 1, the structure of the chair frame is composed of the left and right lower horizontal portions that are placed on the floor, the left and right forefoot portions that rise upward from the front end of the lower horizontal portion, and the rear ends from the upper ends of the left and right forefoot portions. It has an upper horizontal part that extends, and left and right hind legs raised from the rear end of the lower horizontal part, and seats are attached to the upper and lower horizontal parts of the left and right, and the rear ends of the upper and lower horizontal parts are raised upward The lower horizontal part is connected together, and this lower horizontal part is connected to the lower back of the backrest, while the upper horizontal part is connected to the upper ends of the left and right hind legs and the upper horizontal part is the mid-height part of the backrest. The backrest is tilted backward by mainly tilting the rear foot against the elasticity.

For example, Patent Document 2 discloses that a support structure for a seat and a backrest is a frame system in a so-called rotary chair having a gas cylinder type leg support. The applicant of the present application has disclosed an improvement plan of a chair having a frame structure in, for example, Patent Document 3.
Japanese Patent Publication No. 8-15446 Japanese National Patent Publication No. 9-502631 Japanese Patent Application No. 2005-57720

  In order to improve comfort when the seated person leans on the backrest, it is effective to tilt the backrest as much as possible and move the seat forward as much as possible. Since the part is merely elastically deformed, the amount of backward tilting of the backrest and the amount of forward movement of the seat are small, and there is a problem that there is a limit to improving comfort. Moreover, the chair of patent document 2 only slides back and forth as a whole, and it can be said that the locking function using the bending of the member cannot be expected so much.

  On the other hand, in the chair of Patent Document 3 according to the prior application of the applicant of the present application, the frame material can be greatly bent and deformed, and the posture can be greatly deformed, so that the back tilt angle of the backrest and the forward movement amount of the seat can be obtained. Therefore, there is an advantage that the comfort in the rocking state can be improved while the chair has a frame structure.

  By the way, Patent Document 1 uses a bending deformation of a frame material to impart a locking property to the chair. In this case, the longer the frame material is, the easier it is to bend and deform. However, since the thing of patent document 1 is only giving rocking | locking property using that a frame material bends (bends) in a side view, when it diverts to a rotary chair like patent document 2, it is the frame material. Since the length cannot be increased, there is a problem that sufficient locking performance cannot be ensured.

  The present invention has been made in view of such a current situation, and an object of the present invention is to provide a chair having a frame structure that can ensure high locking performance while being compact and simple.

Chair of the present invention, as a basic structure, a seat and a backrest which are connected to each other, and a base disposed below the seat, the seat asked to support in the base, the back frame member attached to the base A backrest is attached, and the backrest is allowed to tilt backward due to elastic deformation of the back frame material.

And in invention of Claim 1, the said back frame material has a part of the shape which was located in the left-right outer side of the seat, and was opened backward in the side view, and the part of the shape opened backward in the said side view The upper lateral end of the upper side of the back is integrally provided with an upper lateral part that wraps around the back of the backrest, and the back is attached to the upper lateral part, while the lower part of the portion of the back frame material that opens backward in the side view At the rear end, there is provided a lower horizontal portion that extends inward in the left-right direction in plan view, and the lower horizontal portion is fixed to the base.

According to a second aspect of the present invention, in the first aspect, the seat is supported on the base by a seat frame member having a lower horizontal portion and an upper horizontal portion that are left and right in the front view, and a vertical portion that connects the upper and lower horizontal frames. while being, to the left and right outer side of the seat is disposed a plurality of back frame material extending substantially parallel with the back of the opening shape in and viewed in a side view, respectively, a plurality of back frame material The upper rear end is continuous with the one upper horizontal portion, and the lower horizontal portion is formed on each of the plurality of back frame members.

According to the present invention, the back frame material is bent in a shape that opens rearward in a side view and has a long length, and a lower laterally long portion is provided at the lower end of the rear, so that the person who is seated It is allowed to be greatly deformed by the load when it leans on the backrest. In particular, by providing the lower horizontal portion, since the lower horizontal portion which is allowed to be twisted about its axis, back frame member is made more accessible to deform. For this reason, according to the present invention, it is possible to ensure a high locking performance by increasing the rearward tilt angle of the backrest and the amount of advancement of the seat, although the frame material for the back is attached to the base.

If comprised like Claim 2, since the frame material for backs is comprised by multiple each right and left, it is excellent also in intensity | strength.

  Further, when the back frame material is arranged on the left and right outer sides of the seat, when the seated person leans against the backrest, the left and right back frame materials tend to be deformed so that the distance between them is widened. If comprised in this way, since the whole rigidity will become high by the parallel arrangement | positioning of the multiple back frame materials on right and left, the spreading deformation of the back frame material can be prevented or suppressed remarkably.

Further, in the configuration of claim 2, since a plurality of back frame members are respectively arranged on the left and right outer sides of the seat, the length of the frame member positioned on the outer side and the frame member positioned on the inner side are different. For this reason, the outer frame material and the inner frame material have different ways of deformation, and the two are regulated so as to regulate each other. The tendency to increase the rate of increase in elastic resistance is exhibited, and the feeling of drooling in the rocking state can be further improved.

  Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to a so-called swivel chair. 1 is a perspective view, FIG. 2 is a front view, FIG. 3 is a plan view showing a frame structure, and FIG. 4 is a side view showing movement.

  The chair includes a seat 1 and a backrest 2 that are connected together, and a leg 3 that supports them. The leg 3 includes a plurality of branch legs 4 extending in the radial direction in a plan view and a leg strut 5 having a gas cylinder, the height of which is adjustable. A downward-opening box-like base 7 is fixed to the upper end of the leg column 4.

  The seat 1 and the backrest 2 have a structure in which cushion materials 1b and 2b are stretched on substrates 1a and 2a such as synthetic resin and plywood, and the substrates 1a and 2a of the seat 1 and the backrest 2 are integrally continuous. (It may be configured as a separate member and fixed with metal fittings, or may be connected so as to be relatively rotatable with a connecting tool such as a hinge or a pin). The backrest 2 can be bent in a side view around a bending point (fold) 8 at a height position around the waist of a seated person.

  As a method of making the backrest 2 bendable, as shown in FIG. 4, the substrate 2 a is separated into upper and lower parts and connected with a hinge 9 or a pin, or the substrate 2 a is made of a material having flexibility such as resin. For example, a thin hinge portion may be formed. The backrest 2 can also be displayed with the upper part separated from the main part and the lower part separated from the auxiliary part with the bending point 8 as a boundary.

  The seat 1 is attached to a seat frame member 10 attached to the base 7. The seat frame member 10 is formed in a substantially crank shape with a lower horizontal portion 10a that is left and right long in a front view, a vertically long portion 10b that is bent at both ends thereof, and a left and right upper horizontal portion 10c that is formed at both ends thereof. The lower horizontal portion 10a is fixed to the base 7 or attached to the lower bearing member 11 so as to be relatively rotatable, and the upper horizontal portion 10c is attached to the lower surface of the seat 1 so as to be rotatable relative to the lower bearing member 12. Yes. Therefore, the seat 1 can slide back and forth as the seat frame member 10 rotates about the lower horizontal portion 10a.

  The backrest 2 is supported on the base 7 by an inner back frame member 13 and an outer back frame member 14 which are arranged to be shifted left and right in a front view and a plan view. The back frame members 13 and 14 and the seat frame member 10 are made of a metal material such as steel.

The inner back frame member 13 and the outer back frame member 14 are substantially horizontal in a state of being continuous with the support column portions 13a and 14a rising in the vertical direction in front view on the left and right outer sides of the seat 1 and the upper ends of the left and right support column portions 13a and 14a. Upper and lower longitudinal portions 13b and 14b extending rearward in the posture, lower and rear longitudinal portions 13c and 14c that are continuous with the lower ends of the left and right support columns 13a and 14a and extend rearward and in a side view, and lower portions 13c, lower lateral length portion 13d extending from the rear end of 14c in the lateral inward, and a 14d, further, the lower horizontal length portion 13d, the tip of the 14d to form bent forward portion 13e, 14e, the forward portion 13e and 14e are fixed to the base 7 by welding or the like.
Further, the inner back frame member 13 and the outer back frame member 14 have column portions 13a, 14a, upper front and rear longitudinal portions 13b, 14b, and lower portions 13c, 14c located on the left and right outer sides of the seat 1 as a side view as a whole. It has a shape that opens backward.

  The rear ends of the upper front and rear longitudinal portions 13b and 14b of the inner back frame member 13 and the outer back frame member 14 are continuous with one upper horizontally long portion 15 that extends along the back surface of the portion near the upper end of the backrest 2. The upper horizontally long portion 15 is connected to the back surface of the backrest 2 by a bearing member 16 so as to be relatively rotatable. The upper front and rear longitudinal portions 13b and 14b and the upper laterally long portion 15 constitute an upper portion. In this embodiment, the upper laterally elongated portion 15 is formed by the upper portion of the inner back frame member 13 and the outer back frame member 14. It will be shared.

Incidentally, the upper horizontal portion 15 in the present embodiment has formed bent on the outer back frame member 14 may be formed bent to the inner back frame member 13, for an inner back frame member 13 and for the outer back The frame material 14 may be separated from the frame material 14 and fixed to the longitudinal longitudinal portions 13b and 14b of the frame materials 13 and 14 by welding or the like.

  As clearly shown in FIGS. 2 and 3, the outer back frame member 14 and the inner back frame member 13 extend substantially in parallel in a plan view or a front view except for the upper laterally long portion 15.

  In the above configuration, when a seated person leans on the backrest 2, a large moment is applied to the upper portion of the backrest 2, so that the backrest 2 elastically supports the back frame members 13 and 14 as shown by a dashed line in FIG. 4. It is deformed and tilted largely backward with the bending point 8 as the center. When the portion of the backrest 2 above the bending point 8 is tilted backward, the portion of the backrest 2 below the bending point 8 tends to move relatively forward, and thus the seat 1 is moved forward. For this reason, the seat 2 only moves forward (when the seat frame 10 is fixed), or the seat frame member 10 rotates forward and the seat 1 also moves forward. . In the present embodiment, the seat 1 has a tendency that its front end is lowered (ie, tilted forward) by forward movement.

Since the back frame members 13 and 14 are U-shaped in a side view, they are easy to bend and deform so that the shape in the side view changes because the total length is long, and the lower portions 13c and 14c by left and right longitudinal bottom horizontal length portion 13d, 14d is continuous, lower lateral length portion 13d, 14d is subjected to the action (torsion action) as twisted about its axis, Therefore, the back frame member 13 and 14 are greatly deformed in the direction in which the back tilt angle of the backrest 2 is increased. In particular, the lower lateral length portion 13d, forward portion 13e to 14d, the provision of 14e, lower horizontal length portion 13d, 14d is for receiving an action torsion about the axis over its entire length, is more preferable.

  And although there are two inner and outer frame materials for the back, both have different lengths because of their different lengths. For this reason, they are deformed in a state of regulating each other. In other words, both the back frame members 13 and 14 act as a resistance against one deformation, and the total elastic deformation of the two back frame members 13 and 14 is tilted backward. However, the frame materials 13 and 14 for both backs become more restrictive to each other as the degree of deformation increases. Therefore, the rate of increase in the backward tilt angle of the backrest 2 is greater. As a result, the rate of increase in the elastic restoring force of the back frame members 13 and 14 as a whole increases, and as a result, the backrest 2 does not tilt backward with a feeling of stone but tilts backward with an appropriate reaction force. From this aspect, it is possible to improve the leaning comfort when rocking.

  Although this embodiment is applied to a rotating chair using a gas cylinder as a leg column, the base may be fixed to a leg of a frame structure (the upper part of the leg may be used as a base). The present invention can also be applied to a fixed chair such as a theater chair. Further, the back frame material can also be bent into a rounded state (for example, a U-shaped opening facing backward in a side view) in a side view and a plan view. Note that the structure of the frame presented in this embodiment can be applied to a chair of a type in which the seat and the backrest are separated and only the backrest tilts backward.

It is a perspective view of the chair concerning an embodiment. It is a front view. It is a top view which shows a frame structure. It is a side view which shows a movement.

Explanation of symbols

1 seat 2 backrest 3 legs 7 base 8 bending point (bending allowable part)
DESCRIPTION OF SYMBOLS 10 Seat frame material 13 Inner back frame material 14 Outer back frame material 15 Upper horizontal part which comprises upper part

Claims (2)

A seat and backrest which are connected to each other, and a base disposed below the seat, the seat asked to support in the base, attaching the backrest to the back frame member attached to the base, the elasticity of the back frame member A chair that allows the backrest to tilt backwards by deformation,
The back frame member has a portion that is located on the left and right outer sides of the seat and has a shape that opens backward in a side view, and a backrest that is on the upper rear end of the portion that has a shape that opens backward in the side view. While the upper horizontal part that wraps around the back is integrated and the back is attached to this upper horizontal part,
A lower laterally elongated portion extending inwardly in a plan view is provided at the lower rear end of the portion of the back frame material that opens backward in the side view, and the lower laterally elongated portion is fixed to the base.
Chair. While the seat is Ru Tei supported on the base by the seat frame member having an elongated portion for connecting the lower horizontal portion and the upper horizontal portion and the upper and lower horizontal frame of the left and right longitudinal viewed from the front,
On the left and right outer sides of the seat, a plurality of back frame members each having a shape opened rearward in a side view and extending substantially in parallel in a plan view are arranged, and the upper rear ends of the plurality of back frame members are It is continuous to one of the upper horizontally long portions, and the lower horizontally long portion is formed on each of the plurality of back frame members.
The chair according to claim 1.

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