JP2023096656A - Chair - Google Patents

Abstract

To disclose a structure which allows quick assembly work while preventing worsening of an aesthetic appearance in a chair in which a backrest is attached to a back post separated into right and left parts.SOLUTION: A backrest 3 is made of a synthetic resin, and an upper bracket part 16 and a lower bracket part 17 are protruded backward as a fixing part to the back post 12. The upper bracket part 16 includes an upper projection base part 16a overlapped with an upper end surface of the back post 12 and an upper fitting part 16b fit in an upper end part of the back post 12 from above, and an engaging plate 19 is provided in the upper fitting part 16b as falling-off prevention. The lower bracket part 17 has a lower projection base part 17a fit in an engaging hole 21 of the back post 12 from the front and a lower fitting part 17b, and by dropping the lower fitting part 17b into the inside of the back post 12, a lower part of an overlapped part 12a in the back post 12 is kept not to be separated into the front and the back relative to the backrest 3.SELECTED DRAWING: Figure 2

Description

The present invention relates to a chair having a structure in which a backrest is attached to the back surface of a back support, and is preferably intended for a chair with a simple structure such as a pipe chair.

Pipe chairs with legs made of pipe are widely used, and many of them can be folded by flipping up the seat and rotating it. In a pipe chair, generally, left and right back supports extend upward from a leg device, and a backrest is fixed to the back support.

There are various means for fixing the backrest to the back support, and in Patent Document 1, the back support is arranged so as to overlap the left and right side surfaces of the backrest, and the back support is provided with a bracket piece that overlaps the rear surface of the backrest. It is attached to the backrest with screws. On the other hand, in Patent Document 2, the backrest is provided with a pipe fitted to the back support from above, and the pipe is fixed to the back support with screws.

Microfilm of Japanese Utility Model Laid-Open No. 59-191958 Japanese Utility Model Publication No. 41-16757

In any of the patent documents, the backrest can be firmly attached to the back support. Not only is it time-consuming to manufacture, but there is a problem that processing errors are likely to occur. In addition, since the screws that fix the brackets are visible from the outside, there is a risk that the appearance will be spoiled.

Patent document 2 is the same as patent document 1, and since it requires work to fix the pipe by welding, there is a problem that it takes time to manufacture the chair and that processing errors are likely to occur. Since the head is visible to the public, there is a risk of spoiling the appearance as in Patent Document 1.

The present invention is intended to improve such a situation.

The present invention includes various configurations, typical examples of which are specified in each claim. Of these, the chair according to the invention of claim 1,
"comprising a backrest and a back support positioned at the back of said backrest,
A bracket portion to which the back support is fitted is integrally provided on the back surface of the backrest, and the back support is fixed to the bracket portion in a non-separable manner by a retaining means that cannot be visually recognized from the outside.
It is configured.

In claim 1, the entire backrest may be molded of synthetic resin and the bracket portion may be integrally molded, or the back plate and the bracket portion may be manufactured separately from synthetic resin and integrated by welding or the like. good too. It is also possible to integrate the metal bracket portion with the synthetic resin back plate by insert molding. A metal bracket can be manufactured by a lost-wax method, a die-cast method, or the like.

Alternatively, the back plate may be made of wood such as plywood, and the bracket portion made of synthetic resin may be integrated with the back plate by insert molding. Also, making the retaining means invisible from the outside includes covering the retaining means with a cover.

The invention of claim 2 is a development example of claim 1,
"While the back support is separated into two left and right parts and at least the part overlapping the backrest is in a vertical posture,
The bracket portion is of a fitting type in which the backrest is moved downward and fitted to the back support.”
It is configured.

The invention of claim 3 is a development example of claim 2,
"While the back brace is made of round pipe,
The bracket portion of the backrest is separated into an upper bracket portion and a lower bracket portion, and the upper and lower bracket portions include an overhang base projecting rearward from the back surface of the backrest and a fitting projecting downward from the overhang base. having a joint and
The fitting portion of the upper bracket portion is fitted into the interior of the back support from above and is tightly fitted, and the fitting portion of the upper bracket portion bites into the inner surface of the back support as the retaining means. An engagement plate that prevents upward movement is fixed at
The back post is formed with a vertically elongated engagement hole into which the fitting portion of the lower bracket portion can be inserted when the backrest is stacked from the front and moved downward.”
It is configured.

The invention of claim 4 is a development example of claim 2,
"The bracket part has a cylindrical form that holds the back support, and a cover plate that overlaps the upper end surface of the back support is integrally formed at the upper end,
The cover plate has a downwardly protruding fitting portion that fits into the back support, and an engaging plate that bites into the back support is fixed to the fitting portion as the retaining means.
It is configured.

The invention of claim 5 is a development example of claim 1 as well as claim 2,
"While the back brace is separated into two left and right and at least the part overlapping the backrest is in a vertical posture,
The said bracket part is a form which fits with the said back support|pillar when the said backrest is moved backward.
It is configured.

The invention of claim 6 is applied to a folding chair, and in any one of claims 1 to 5,
"The leg device is a structure in which the left and right side frames are connected with a beam material that is long on the left and right,
The left and right side frames have front legs, rear legs, and front and rear long upper frames connected to the upper ends thereof, and the left and right upper frames are connected by the beam member so that the rear legs are directed upward. the spine is formed by extending to
Moreover, the seat is supported by the upper frame and connected to the beam so that it can be flipped up and rotated."
It is configured.

In the invention of the present application, since the bracket portion is integrated with the back surface of the backrest, the structure of the chair can be simplified, labor for assembly can be reduced, and dimensional accuracy can be improved. In addition, since the retaining means cannot be visually recognized from the outside, it does not impair the appearance.

As in claim 2, when the backrest is moved downward and the bracket part is fitted into the back support, the backrest does not move away from the back support due to an external force in the front-rear direction, so the function of holding the fixed state is excellent. ing. It also has the advantage of being able to be firmly fixed in a state where there is no back-and-forth or left-right horizontal play.

When the structure of claim 3 is adopted, the backrest is held on the back support by placing it on the back support from the front and moving it downward, so that the backrest can be attached in a one-touch operation. Therefore, the workability of assembling the chair can be remarkably improved.

As in claim 4, when a structure in which the bracket portion holds the back support is employed, the lower bracket portion has an excellent holding function, so high mounting strength can be ensured.

As in claim 5, in the configuration in which the backrest is attached to the bracket portion by moving backward, when there are two backrests on the left and right, the portion overlapping the backrest does not have to be in a vertical posture, and the left and right backrests do not have to be in a vertical position. A type that is connected at the upper end can also be adopted. Therefore, there is an advantage that the design of the back brace is highly flexible.

Although claim 6 is applied to a folding chair, the chair has a simple four-legged appearance, so it looks like it is foldable but not foldable. Therefore, there is an advantage that the chair can be used comfortably in various places while being a foldable chair that can effectively use the storage space.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external view of the chair which concerns on 1st Embodiment, (A) is the perspective view which looked at the unfolded state from the front, (B) is the perspective view which looked at the folded state from the front, (C) is the unfolded upper end back downward. 1 is a perspective view seen from . (A) is a rear view, (B) is a BB sectional view of (A), (C) is a partially enlarged view of (B), (D) is a DD sectional view of (B), ( E) is a cross-sectional view taken along line EE of (B). (A) is a view showing the second embodiment, and is a side cross-sectional view similar to FIG. A cross-sectional view, and (D) is a cross-sectional view taken along line DD of (B). (A) is a side cross-sectional view of a fourth embodiment, (B) is a cross-sectional view taken along line BB of (A), and (C) is a side cross-sectional view of a fifth embodiment. (A) is a rear view of the sixth embodiment, (B) is a BB cross-sectional view of (A), (C) is a CC cross-sectional view of (A), and (D) is the seventh embodiment. and (E) is a plan sectional view of the main part of the eighth embodiment.

(1).Outline of First Embodiment Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment applies to a chair that can be folded and nested. First, a first embodiment shown in FIGS. 1 and 2 will be described.

As shown in FIG. 1, the chair includes a seat 1, leg devices 2 supporting the seat, and a backrest 3. As shown in FIG. The leg device 2 connects the left and right leg frame bodies in which the horizontal upper frame 6 is connected between the upper ends of the front legs 4 and the rear legs 5, and the left and right upper frames 6 only at the rear end portions. The seat 1 is connected to a shaft support member 8 fixed to the beam member 7 so as to be able to flip up and rotate.

As can be understood from FIG. 1(B), the seat 1 consists of an outer shell 9 made of synthetic resin, which is vertically opened, an inner shell 10 made of synthetic resin attached to the upper surface of the outer shell 9, and an inner shell 10 made of synthetic resin. A cushioning material (not explicitly shown) is disposed, and the cushioning material is covered by a skin material. On the other hand, the shaft support member 8 is formed in a U shape with left and right rearward arm portions 8a and a support shaft 8b integrally connected to the rear ends thereof. The support shaft 8b is non-detachably held by the outer shell 9 by the bearing cap 11. As shown in FIG. Therefore, the seat 1 rotates up and down with the support shaft 8b of the support member 8 as a fulcrum.

The front legs 4 and the upper frame 6 are integrally formed by bending one metal pipe (steel pipe or aluminum pipe), and the rear end of the upper frame 6 is welded to the rear legs 5 . A back support 12 extending upward is integrally formed on the rear leg 5 . The backrest 3 is a molded product made of synthetic resin, and is fixed to the left and right back supports 12 in a structure to be described later.

The left and right front legs 4 and the left and right rear legs 5 are inclined at a slight angle with respect to the vertical line so as to form a V shape in the front view. In addition, the front legs 4 and the rear legs 5 are inclined at a slight angle with respect to the vertical line so as to form a V shape when viewed from the side (the front legs 4 are inclined backward and the rear legs 5 are inclined forward). ing.).

By making the space between the left and right front legs 4 wider than the space between the left and right rear legs 5, a plurality of chairs can be nested back and forth with the seat 1 raised and rotated. Therefore, the left and right upper frames 6 form a V-shaped posture that spreads forward in a plan view. A caster 13 capable of horizontally rotating is attached to the lower end of each leg 4, 5, but there is also a type in which a synthetic resin or rubber grounding member is attached in place of the caster.

In the unfolded state, most of the left and right upper frames 6 are arranged below the seat 1 , and the seat 1 is supported by the left and right upper frames 6 . Therefore, the member for folding (the pivot member 8) is not visible, and the appearance is as simple as if it were not foldable.

A cushioning material (bumper member) 14 made of synthetic resin and having an arcuate cross section is fixed to the upper surface of the upper frame 6 in order to soften the contact with the seat 1 .

(2). Attachment structure of the backrest The left and right backrest supports 12 are separated from each other and the upper ends are free ends. As clearly shown in FIG. 2(A), the portion of the back support 12 below the backrest 3 is inclined so that the distance between them narrows upward following the posture of the hind legs 5. However, the overlapped portion 12a overlapping the rear surface of the backrest 3 is in a vertical posture. Therefore, the overlapped portions 12a of the left and right back supports 12 are parallel when viewed from the rear (front view).

On the rear surface of the backrest 3, a pair of left and right upper bracket portions 16 and lower bracket portions 17 are projected backward as portions for fixing to the back support 12. As shown in FIG. Further, between the upper and lower bracket portions 16 and 17, as shown in FIG. 2(D), an auxiliary bracket portion 18 is formed in which the overlapping portion 12a of the back support 12 is partially fitted. The auxiliary bracket part 18 is for enhancing the stability of the back support 12 and may be omitted.

The upper bracket portion 16 has an upper overhanging base portion 16a projecting backward so as to overlap the upper end of the back support 12, and an upper fitting portion 16b projecting downward from the overhanging base portion 16a. The upper fitting portion 16b has a cylindrical solid structure, and is dimensioned so as to be tightly fitted inside the overlapped portion 12a of the back support 12. As shown in FIG. A large number of grooves may be formed in the upper fitting portion 16b in the circumferential direction so that the upper fitting portion 16b is closely fitted to the back support 12 while absorbing dimensional errors.

A disc-shaped engaging plate (push nut) 19 having a petal-shaped outer peripheral portion is fixed to the lower end face of the upper fitting portion 16 b of the upper bracket portion 16 with a screw 20 . The engaging plate 19 is made of a metal harder than the back support 12, and has a petal-shaped outer peripheral portion that tapers upward. In the figure, the cross-sectional representation of the engagement plate 19 is omitted (the same applies to other embodiments).

The engagement plate 19 is set to have a diameter slightly larger than the inner diameter of the back support 12 in a free state, and is fitted into the overlapped portion 12a of the back support 12 while being narrowed and deformed. , the engaging plate 19 bites into the overlapped portion 12a of the back support 12, and the upper fitting portion 16b (the backrest 3) is held against the back support 12 so as not to move upward. In order to allow the narrowing deformation of the engaging plate 19, the lower end portion of the upper fitting portion 16b is tapered (forming a relief surface).

On the other hand, as shown in FIG. 2(E), the lower bracket portion 17 has a width smaller than the outer diameter of the back support 12, and has a lower overhanging base portion 17a integrally connected to the rear surface of the backrest 3 and a lower overhanging base portion. and a lower fitting portion 17b protruding downward from 17a.

The overlapped portion 12a of the back support 12 is formed with an engaging hole 21 extending vertically and into which the lower bracket portion 17 is fitted from the front side. A portion of the overlapping portion 12a of the back support 12 is sandwiched between the backrest 3 and the backrest 3. As shown in FIG. In the illustrated example, the front end surface of the lower bracket portion 17 is in contact with the inner surface of the overlapping portion 12a of the back brace 12. As shown in FIG. By doing so, there is an advantage that the fitting strength between the lower bracket portion 17 and the back support 12 can be improved.

When the lower bracket portion 17 is dropped into the engagement hole 21, the interval dimension L1 between the upper end of the engagement hole 21 and the lower bracket portion 17 is larger than the downward protrusion dimension L2 of the overlapping portion 12a of the upper bracket portion 16. The dimensions are set to be slightly larger (otherwise, the upper and lower bracket portions 16, 17 cannot be fitted into the overlapping portion 12a of the back support 12).

This embodiment has the above configuration, and the backrest 3 cannot be moved forward, backward, left, right, or up and down with respect to the back support 12 by a one-touch operation of stacking it on the overlapped portion 12a of the back support 12 from the front and moving it downward. can be attached to The engaging plate 19 is an example of retaining means described in the claims, but it is hidden by the overlapped portion 12a of the back support 12 and cannot be seen from the inside. The lower bracket portion 17 is also entirely hidden by the overlapping portion 12a of the back support 12, and only the upper projecting base portion 16a of the upper bracket portion 16 is exposed to the outside, but the upper projecting base portion 16a is the overlapping portion 12a. It has an appearance that is integrated with it, so it has excellent aesthetics.

In this embodiment, a pair of upper and lower bracket portions 16 and 17 are formed, but the lower bracket portion 17 can be formed in a plurality of stages. Forming a plurality of lower bracket portions 17 can increase the resistance when an external force acts on the backrest 3 from behind. Since the back brace 12 is separated into left and right, it can be easily bent.

(3). Other Embodiments Next, other embodiments shown in FIG. 3 and subsequent figures will be described. In the second embodiment shown in FIG. 3(A), the lower bracket portion 17 is formed in a tubular shape to hold the overlapping portion 12a of the back brace 12. As shown in FIG. Forming the lower bracket portion 17 in a cylindrical shape in this way has the advantage of improving the strength of the fitting with the embodiment of the back brace 12 . It is also possible to form the lower bracket portion 17 in a plurality of stages. Further, as indicated by the dashed line, the upper bracket portion 16 can be formed in a tubular shape with a cover plate. In this case, the function of the upper bracket portion 16 to grip the back support 12 can be significantly improved. .

The third embodiment shown in FIGS. 3(B) to 3(D) is a modification of the first embodiment. In this embodiment, the upper overhanging base portion 16a of the upper bracket portion 16 is formed into a ring shape which is opened vertically. The upper fitting portion 16b is formed in a cylindrical shape with a bottom, and a boss portion 23 is provided on the bottom surface of the upper fitting portion 16b to secure a screwing allowance for the screw 20. As shown in FIG. In the third embodiment, since the thickness of the upper bracket portion 16 can be made as uniform as possible, it is possible to prevent sink marks after molding and improve dimensional accuracy.

In the third embodiment, since the upper bracket portion 16 is open upward, a cover plate 24 is attached to the upper bracket portion 16 in order to close the hole. The cover plate 24 has a cylindrical portion 25 which is inserted into the upper fitting portion 16b. It is engaged with the outward engaging claw 26b. A relief hole 27 is formed in the upper fitting portion 16b to enable molding of the outward engaging claw 26b by injection molding. The number of engaging claws 26a and 26b can be set arbitrarily. It is also possible to form an engaging groove instead of the outward engaging claw 26b.

The fourth embodiment shown in FIG. 4(A) is a modification of the second embodiment (FIG. 3(A)). The thickness of the upper bracket portion 16 is made uniform as much as possible by forming a large number of them. Also in this case, the dimensional accuracy can be improved by preventing sink marks after molding.

In the fifth embodiment shown in FIG. 4(C), the bracket portion 29 is formed in a series of vertically elongated cylinders, and a cover plate 29a is integrally formed at the upper end thereof so as to overlap the upper end of the spine support 12. . A cylindrical inner plug 30 with a downward opening is fixed to the upper end of the back support 12 by welding or press-fitting so as not to come off. , through holes 31 communicating with each other.

Furthermore, a catch member 32 made of resin and also used as a cover overlaps the cover plate 29a of the bracket portion 29 from above. It engages the upper inner surface. Therefore, in the present embodiment, the catch member 32 (integrated with the inner plug 30) constitutes the retaining means described in the claims. In this embodiment, since the overlapped portion 12a of the back support 12 is held by the bracket portion 29 over a long range in the vertical direction, the fixing strength is remarkably increased.

In the sixth embodiment shown in FIGS. 5(A) to 5(C), the bracket portion 33 has a trough-like shape that is open rearward, and is tightly fitted to the overlapping portion 12a of the back support 12. As shown in FIG. The rearward projecting height of the bracket portion 33 is approximately the same as the outer diameter of the spine support 12 .

In this embodiment, the bracket portion 33 is surrounded from behind by a pressing member 34 having a U-shaped cross section. The left and right bracket portions 33 and the overlapping portions 12a of the back strut 12 are fastened together with screws 35 (counter-sunk screws) arranged in a plurality of vertical stages. Therefore, the axis of the screw 35 is in a laterally long position. The pressing member 34 is formed with a forward facing boss portion 36 so as to overlap the overlapping portion 12a of the back support 12 over a wide range.

In this embodiment, the pressing member 34 and the screw 35 constitute the securing means described in the claims, but a cover 37 is provided to hide the screw 35. As shown in FIG. The cover 37 has a gutter-like shape having a lid portion 37a at the upper end and left and right side plates 37b. By providing an inwardly facing rib 39 fitted in the cover 38, the cover 37 is held by being fitted from above so that it cannot be displaced in the front, rear, left, and right directions. An engagement plate 19 is fixed to the boss portion 40 to prevent the upward pull-out.

In the seventh embodiment shown in FIG. 5(D), a rear-facing bracket portion 33 integrally formed with the backrest 3 is fixed to the overlapped portion 12a of the back support 12 with left and right screws 35 so that the bracket portion 33 and the screw are attached. The head of 35 is covered with a cover 37 . Inward ribs 39 are formed at the front ends of the left and right side plates 37b of the cover 37, while gaps (engagement grooves) 38, into which the inward ribs 39 are fitted from above, are formed at the base of the bracket portion 33 over the entire vertical length. forming. The removal of the cover 37 is prevented by means similar to that shown in FIG. 5(B).

The eighth embodiment shown in FIG. 5(E) is a modification of the seventh embodiment, in which the head 35a of the screw 35 is used to hold the cover 37 so that the cover 37 cannot be moved backward. A vertical groove 37c into which the head 35a of the screw 35 is inserted is formed on the inner surface so as to open downward.

In this embodiment, since it is not necessary to form the gap 38 in the bracket portion 33, a slide mold is not required for molding the backrest 3, thus facilitating manufacturing. In this embodiment, the head 35a of the screw 35 is formed in a flat disk shape, but a head with a hexagonal hole or a pot head can also be used (it is sufficient if the head 35a protrudes outside the side plate 37b). .

Although the embodiments of the present invention have been described above, the present invention can be embodied in various other ways. For example, the sixth embodiment of FIG. 5 is a specific example of claim 5, but as another specific example of claim 5, a boss body is provided on the rear surface of the backrest 3 so as to protrude backward, and the overlapping portion of the back support is provided. It is also possible to form an engaging hole into which the boss body is fitted in 12a, and to hold the boss body and the back strut 12 in such a way that they cannot be separated from each other in the front-rear direction by means of retaining means such as an engaging plate.

The backrest can adopt a structure in which a synthetic resin bracket is integrated with a wooden backboard by insert molding or the like. In this case, the left and right bracket portions may be separately fixed to the back plate, or the left and right bracket portions may be continuously connected. In any case, the area of the bracket portion should be set so as to secure the necessary bonding strength to the back plate. Various types of leg devices can be employed, for example, a type formed in an inverted y-shape when viewed from the side, a type formed in a U-shape with a rearward opening when viewed from the side, and the like.

The present invention can be embodied in a chair. Therefore, it can be used industrially.

1 seat 2 leg device 3 backrest 4 front leg 5 rear leg 6 upper frame 7 beam member 8 pivot member 12 back support 12a overlapping portion 16 upper bracket portion 16a, 17a projecting base portion 16b, 17b fitting portion 19 example of retaining means Engagement plate as 21 Engagement hole

Claims (6)

comprising a backrest and a back support positioned on the back of the backrest,
A bracket part to which the back support is fitted is integrally provided on the back surface of the backrest, and the back support is fixed to the bracket part by a retaining means that cannot be seen from the outside so that it cannot be detached.
Chair. The back support is separated into two left and right parts, and at least the part that overlaps the backrest is in a vertical posture,
The bracket part is a fitting type in which the backrest is moved downward and fitted to the back support,
A chair as claimed in claim 1. While the back brace is made of a round pipe,
The bracket portion of the backrest is separated into an upper bracket portion and a lower bracket portion, and the upper and lower bracket portions include an overhang base projecting rearward from the back surface of the backrest and a fitting projecting downward from the overhang base. having a joint and
The fitting portion of the upper bracket portion is fitted into the interior of the back support from above and is tightly fitted, and the fitting portion of the upper bracket portion bites into the inner surface of the back support as the retaining means. An engagement plate that prevents upward movement is fixed at
The back column is formed with an engagement hole extending vertically into which the fitting portion of the lower bracket portion enters when the backrest is stacked from the front and moved downward,
A chair according to claim 2. The bracket part has a cylindrical form that holds the back support, and a cover plate that overlaps the upper end surface of the back support is integrally formed at the upper end,
The cover plate has a fitting portion that is fitted into the back post projecting downward, and an engaging plate that bites into the back post is fixed to the fitting portion as the retaining means,
A chair according to claim 2. The back support is separated into two left and right parts, and at least the part that overlaps the backrest is in a vertical posture,
The bracket part is configured to fit with the back support when the backrest is moved backward.
A chair as claimed in claim 1. The leg device has a structure in which the left and right side frames are connected with a left and right long beam material,
The left and right side frames have front legs, rear legs, and front and rear long upper frames connected to the upper ends thereof, and the left and right upper frames are connected by the beam member so that the rear legs are directed upward. the spine is formed by extending to
and the seat is supported by the upper frame and connected to the beam member so as to be flipped up and rotated.
A chair according to any one of claims 1-5.

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