JP7260949B2 - Chair - Google Patents

Description

TECHNICAL FIELD The present invention relates to a chair, and is particularly characterized by a mounting structure of an armrest device.

Armrest devices are used as optional items in chairs. Armrest devices can be broadly divided into those whose height can be adjusted and those whose height cannot be adjusted. and secures this inward horizontal portion to the body of the chair.

Where to mount the inward horizontal portion of the armrest system varies. For example, it is attached to the lower surface of the seat plate, attached to a base fixed to the upper ends of the legs, or attached to a back support frame connected to the base so as to be tiltable backward. On the other hand, as disclosed in Patent Document 1, for example, an inward horizontal portion is also attached to the lower surface of a seat support member that supports the seat.

Japanese Patent No. 2503184

Where the inward horizontal armrests are to be mounted depends on the design of the chair. has excellent strength, it is a promising member to be attached to the armrest device. In addition, in a chair in which the seat tilts backward in conjunction with the backrest when rocking, the seat support member also tilts rearward when rocking, so when the armrest device is attached to the seat support member, the armrest device rotates together with the seat support member. Therefore, there is also the advantage that it is excellent in followability to the body of a seated person.

On the other hand, since the seat receiving member is originally a member for attaching the seat , it may not be possible to attach the armrest device as it is unless some measures are taken. For example, there is a case where the periphery of the seat receiving member is surrounded by a seat outer shell, a cover, or the like.

The present invention has been made in view of such circumstances, and aims to effectively utilize a seat receiving member as a member to which an armrest device is attached.

The chair of the present invention is
" A seat support member is supported by a base provided at the upper end of the leg support, the seat is attached to the seat support member via an intermediate support, and the back support frame to which the backrest is attached is attached to the base. It's connected so that it can tilt backwards ."
This is the basic configuration.

And in the invention of claim 1, in the above basic configuration,
"The intermediate support is formed in the shape of a shell that has ribs on its upper surface and is open upward, and the seat support member protrudes leftward and rightward from the base and is exposed below the intermediate support. and the side support portion serves as an armrest mounting portion capable of fixing the inwardly directed horizontal portion of the armrest device from below via a spacer placed on the lower surface of the side support portion,
The intermediate support is formed with downwardly projecting longitudinally extending downward projections on both left and right sides of the base. The spacer and the inward horizontal portion of the armrest device form a recess that enters from below."
It has the characteristics of

The invention of claim 2 is, in claim 1 ,
"A plurality of tapped holes for fixing the inwardly facing horizontal part of the armrest device are formed in the side support part and aligned in the front-rear direction, and positioning holes through which the spacer is positioned via a pin are formed in the left-right direction. It is formed in multiple numbers alongside
It is configured.

The invention of claim 3 is, in claim 1 or 2 ,
"The attachment position of the inward horizontal part with respect to the side support part can be selected from a plurality of positions in the left and right direction."
It is configured.
In the third aspect of the present invention, the inward horizontal portion and the spacer are fastened together to the side support portion with screws as means for shifting the mounting position of the inward horizontal portion with respect to the side support portion to a plurality of left and right positions. In that case, a plurality of screw insertion holes may be provided on the left and right sides of the inward horizontal portion, or a plurality of tapped holes provided on the side support portions may be provided on the left and right sides.

The invention of claim 4 is a chair provided with an armrest device, and in the above basic configuration,
"The intermediate support is formed in the shape of a shell that has ribs on its upper surface and is open upward, and the seat support member protrudes left and right from the base and is exposed below the intermediate support. The inward horizontal part of the armrest device is fixed to the lower surface of the side support part via a spacer,
The intermediate support is formed with downwardly projecting longitudinally extending downward projections on both left and right sides of the base. The spacer and the inward horizontal portion of the armrest device form a recess that enters from below."
It has the characteristics of

The armrest device has a basic structure in which an armrest is provided at the upper end of the elbow support, and an inward horizontal portion is provided at the lower end of the elbow support. In the case of the height adjustable type, an elevating body is attached to the elbow support, and an elbow rest is attached to the upper end of the elevating body. And even if the design is different, the height of the elbow struts is generally the same for each manufacturer. In the case of the height-adjustable type, it is necessary to ensure the required length of the lifting stroke of the lifting body, so it can be said that the necessity of aligning the height (vertical length) of the elbow struts becomes even greater.

Therefore, even if there is room for design change in the armrest device, it is difficult to change the height position of the inward horizontal portion. On the other hand, the seat support member is designed based on the function of the chair, and its height position is also set in relation to other members. Therefore, the seat receiving member may be higher than the inward horizontal portion of the armrest device. As a means to cope with this difference in height, it is possible to provide an upward convex portion on the inward horizontal portion, but in this case, the problem of complicating the manufacture of the elbow support and the need for each chair model In addition, if the height of the seat receiving member is different, many types of elbow supports must be manufactured correspondingly, resulting in a problem that not only the manufacturing cost increases but also the management of the members takes time and effort. .

In contrast, according to the inventions of the present application, the inward horizontal portion of the armrest device can be fixed to the seat support member via the spacer, so that the inward horizontal portion of the armrest device can be maintained at the same reference height as in the conventional art. At the same time, the deviation from the height of the seat receiving member can be eliminated. Therefore, the seat receiving member can be effectively used as an attachment target for the armrest device. In addition, freedom in designing the seat receiving member is ensured.

Furthermore, when spacers are used as in the present invention , when there are a plurality of types of chairs with different heights of seat receiving members, it is sufficient to use a common armrest device and manufacture only spacers for each model. Therefore, the cost for preparing a plurality of types of chairs can be suppressed .

When fixing the inward horizontal portion to the seat support member with a plurality of screws, if the screws are lined up in the left-right direction, the left-right width of the spacer must be increased, which may result in a lack of compactness. . On the other hand, if the structure of claim 3 is adopted, the screws are arranged in the front and rear direction, so that the lateral width of the spacer can be made as small as possible, and the lower part of the seat can be made compact.

Further, according to the invention of claim 2 , by fitting the left and right positioning pins provided on the spacer into the positioning holes of the seat receiving member, there is an advantage that the mounting strength of the elbow rest can be improved. That is, when a downward load is applied to the armrest, the inward horizontal portion tends to rotate downward with the tip portion as a fulcrum when viewed from the front of the chair. Although it tries to rotate downward with the upper edge as a fulcrum (that is, when the chair is viewed from the front, the outer edge tries to separate from the seat receiving member), in claim 2 , the positioning pin and the positioning hole are arranged to the left and right. Since they are aligned, the positioning pins act as a high resistance to the rotation of the spacer, thereby significantly improving the fixing strength of the armrest device.

Therefore, according to the second aspect of the invention, there is an advantage that the fixing strength can be improved while securing the ease of attachment of the armrest device. Further, in the third aspect of the invention, since the lateral position of the armrest device with respect to the seat can be adjusted, it is possible to change the lateral position of the armrest device according to, for example, the physique of the user. Therefore, it is user-friendly.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the external appearance of the chair which concerns on embodiment, (A) is the perspective view of the whole seen from the front, (B) is a top view, (C) is the perspective view seen from the back. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the external appearance of the chair which concerns on embodiment, (A) is a front view, (B) is a rear view, (C) is a side view, (D) is a front view of only a backrest. Fig. 3 is an exploded perspective view of a chair; (A) is an exploded perspective view showing the attachment structure of the back support frame, and (B) is an exploded perspective view showing the relationship between the tilting base and the fixed base. (A) is an exploded perspective view showing the relationship between the seat support member and the tilting base, and (B) is a diagram showing the movement of the tilting frame and the back support frame. (A) is a separated perspective view of the seat receiving member and the seat outer shell, and (B) is a perspective view of the seat outer shell with the seat receiving member attached. Both (A) and (B) are perspective views from below with the armrest device removed. Fig. 3 is a perspective view of the chair from the lower rear with the armrests on; It is a figure which shows the attachment structure of an armrest apparatus, (A) is the isolation|separation perspective view seen from the top, (B) is the perspective view after attachment. It is a figure which shows the attachment structure of an armrest apparatus, (A) is the separated perspective view seen from the bottom, (B) is a front view after attachment, (C) is a side view of an elbow support and a spacer.

Next, embodiments of the present invention will be described based on the drawings. This embodiment is applied to a swivel chair that is frequently used in offices. In the following description, terms such as front, rear, left, and right are used to specify directions, but these are defined as a state seen from a person who normally sits on a chair. The front view is the state seen from the direction facing the occupant of the chair.

(1).Outline of the Chair First, the outline of the chair will be explained based on FIGS. The basic configuration of the chair is the same as that of the conventional chair, and as shown in FIG. In addition, an armrest device 4, a hanger 5 and a headrest 6 are provided as optional items. The left and right armrest devices 4 form one set, but only one of them is shown in the figure.

The leg device 1 has a leg strut 7 made of a gas cylinder, and the leg strut 7 is supported by a plurality of branch arms 8 extending radially. A caster is provided at the tip of each branch arm 8 . As shown in FIG. 4 , a fixed base 9 is attached to the upper end of the leg support 7 , and a tilting base 10 is attached to a portion of the fixed base 9 on the front side of the leg support 5 by a laterally elongated support shaft 11 . Concatenated. A base portion to which the seat 2 and the backrest 3 are attached is composed of the fixed base 9 and the tilting base 10 as main members. In this embodiment, the claim base includes both the fixed base 9 and the tilting base 10 .

As shown in FIG. 3, a fixed base 9 and a tilting base 10 support a seat receiving member 12 to which the seat 2 is attached. there is The backrest 3 thus locks together with the tilting base 10 . Further, the seat receiving member 12 moves backward and tilts backward in conjunction with the backward tilting motion of the tilting base 10 . Therefore, the seat 2 retreats and tilts backward in conjunction with the backward tilting motion of the backrest 3 (synchronized). The armrest device 4 is fixed to the seat receiving member 12 .

Although not shown, a locking spring is arranged inside the fixed base 9 to provide resistance to locking. The hardness of the locking spring can be adjusted, for example, by rotating the elasticity adjustment handle 14 shown in FIG. The elasticity adjusting handle 14 is arranged on the right side as seen from the seated person, and arranged coaxially with the support shaft 11 . A height adjustment handle 15 for controlling the expansion and contraction of the leg support 5 is arranged on the side opposite to the elasticity adjustment handle 14 . A height adjustment handle 15 is also arranged coaxially with the support shaft 11 .

As shown in FIG. 3, the seat 2 has a structure in which a seat inner shell 17 made of synthetic resin is covered with a seat cushion material 18 . The upper surface of the seat cushion material 18 is covered with a skin material such as cloth or synthetic leather. Although the seat inner shell 17 and the seat cushion material 18 are shown separately in FIG. 3, they are integrated by insert molding in this embodiment.

The seat 2 is attached to a seat outer shell 19 arranged therebelow. The seat outer shell 19 is an example of an intermediate supporting body described in claims, and includes a seat main outer shell 20 fixed to the seat receiving member 12 and a seat front outer shell attached to the seat main outer shell 20 so as to be slidable back and forth. 21 and a seat rear outer shell 22 arranged behind the seat main outer shell 20. - 特許庁Therefore, the seat 2 can also be thought of as a structure in which the three parts of the main portion, the front portion, and the rear portion are integrated. The seat rear outer shell 22 is vertically rotatably connected to the seat main outer shell 20 by a laterally elongated pin. As shown in FIG. 3, ribs are formed on the upper surface of each part that constitutes the seat outer shell 19 .

On the other hand, the seat inner shell 17 includes a seat main inner shell 17a fixed to the seat main outer shell 20, a seat front inner shell 17b integrally continuous with the front end of the seat main inner shell 17a, and a seat main inner shell 17a behind the seat main inner shell 17a. It is composed of a seat rear inner shell 17c that is integrally continuous to the end. The seat front inner shell 17b has laterally elongated slits so that it can be rolled downward and deformed. When the seat front outer shell 21 moves backward, it is rolled downward. become smaller.

A seat rear inner shell 17c of the seat inner shell 17 is continuous with the seat main inner shell 17a so as to rotate vertically about its front end. The rear end of the seat rear inner shell 17c is connected to the lower end of the backrest 3 by a laterally elongated pin. Therefore, when the backrest 3 is locked, the seat 2 moves backward and tilts backward as a whole, and the seat rear inner shell 17c tilts backward relative to the seat main inner shell 17a.

The backrest 3 has a structure in which a back cushion material 24 is arranged in front of a back outer shell 23 made of resin, and the front surface of the back cushion material 24 is covered with a skin material. In this embodiment, the back outer shell 23 and the back cushion member 24 are divided into a plurality of elements, and the adjacent elements can rotate relative to each other.

The back support frame 13 is integrally provided with a back strut 13a extending upward behind the backrest 3, and the upper end of the back strut 13a is connected to the upper and lower middle portions of the back outer shell 23 with horizontally elongated pins. ing. Therefore, the backrest 3 and the back support 13a rotate relative to each other. Further, the lower end of the back outer shell 23 is connected to the rear end of the seat rear outer shell 22 with a laterally elongated pin.

(2). Base Section Next, the base section will be described with reference to FIG. 5 and subsequent drawings. As described above, the base portion has the fixed base 9 and the tilting base 10 as main members. As can be seen from FIG. 4(B), the fixed base 9 is a die-cast or cast product, and is shaped like a shallow box with an upward opening having left and right side plates 9a and a bottom. The upper end of the leg support 7 is fitted from below to a cylindrical boss portion 27 having an upper and lower opening provided in the rear portion. A front portion of the fixed base 9 is inclined in a side view so as to rise toward the front.

On the other hand, as shown in FIG. 4(B), the tilting base 10 has left and right side plates 10a and a rear plate 10b and is opened upward and downward. is fixed. The back support portion 28 is formed in the shape of an upwardly opening gutter having left and right side plates, and the front end portion of the back support frame 13 is fitted therein. As shown in FIG. 4A, the back support frame 13 is fixed to the back support portion 28 with a plurality of bolts 29 .

The tilting base 10 is made of a metal plate, and its side plate 10a is positioned outside the side plate 9a of the fixed base 9. As shown in FIG. That is, the tilting base 10 covers the fixed base 9 from the outside. As shown in FIG. 4 , a side plate 10 a of the tilting base 10 is connected to the fixed base 9 by a support shaft 11 at a portion near the front end.

As shown in FIG. 4, the front upper ends of the left and right side plates 10a of the tilting base 10 are connected by a front joint 30 that is horizontally long. A front fixed spring bearing 31 is arranged below the front joint 30 . The front fixed spring bearing 31 is connected to the fixed base 9 and the tilting base 10 by a support shaft 11 . Since the support structure of the spring is not directly related to the present invention, it will be omitted.

For example, as shown in FIGS. 4 and 5, a front link 32 extending upward from the fixed base 9 is connected to the front end of the fixed base 9 by a laterally elongated first shaft 33 . Therefore, the front link 32 can rotate in the front-rear direction about its lower end. A front portion of the seat receiving member 12 is connected to the upper end of the front link 32 by a laterally elongated second shaft 34 .

As shown in FIGS. 5A, 9 and 10, the seat receiving member 12 has left and right vertically long frames 35 which are longitudinally long. The left and right vertically long frame 35 is an inverted L-shaped sheet metal product with upper flanges 35a formed at the upper ends thereof. Left and right horizontally long front stays 36 and rear stays 37 are welded to the left and right upper flanges 35a. Accordingly, the seat receiving member 12 has a frame structure that is open vertically. The front stay 36 and the rear stay 37 protrude to the left and right outer sides of the vertically long frame 35 .

The front portion of the left and right vertical frame 35 is connected to the upper end of the front link 32 by the second shaft 34, and the rear portion of the left and right vertical frame 35 is connected to the rear end portion of the tilting base 10 by the left and right horizontal third shaft 38. It is Therefore, when the tilting base 10 tilts backward, the seat receiving member 12 tilts backward while retreating . However, the rearward inclination angle of the seat receiving member 12 is smaller than the rearward inclination angle of the tilting base 10 .

The rear stay 37 has a flat plate structure, while the front stay 36 has a gutter-like shape with a downward opening. Further, the front stay 36 is formed with a stepped portion 36a having substantially the same height as the upper flange 35a of the vertically long frame 35. As shown in FIG. On the other hand, the portion of the vertically elongated frame 35 where the rear stay 37 is fixed forms a downward recess 39 . Therefore, the upper surface of the rear stay 37 and the upper flange 35a are substantially at the same height.

(3).Armrest Device and Its Mounting Structure Since the armrest device is fixed to the rear stay 37, the thickness of the rear stay 37 is thicker than that of the vertically elongated frame 35 and the front stay . The armrest device 4 is fixed to this rear stay 37 . This point will be explained mainly based on FIGS.

The armrest device 4 of this embodiment is height-adjustable, and as shown in FIG. and an elbow rest 42 provided at the upper end of the lifting body 41 and extending in the front-rear direction. Note that the elbow support 40 is slightly inclined forward.

The elevating body 41 has a tubular form and is fitted to the elbow support 40 from the outside. A button (not shown) for unlocking when adjusting the height is provided on the inside surface of the upper portion of the lifting body 41 . The elbow rest 42 may be fixed to the lifting body 41 . Alternatively, it can be mounted to perform one or more of the following: slide back and forth, slide left and right, and pivot horizontally. In addition, the armrest device 4 may adopt an integrated structure that is not movable and whose height cannot be changed.

The elbow strut 40 is, for example, a resin molded product or an aluminum die-cast product, and is integrally formed with an inwardly directed horizontal portion (or an inwardly directed portion) 43 directed toward the base portion. In addition, both the upright portion and the inward horizontal portion 43 of the elbow support 40 have a substantially flat cross section.

On the other hand, the rear stay 37 that constitutes the seat receiving member 12 is provided with side support portions 37a protruding to the left and right outer sides of the bases 9 and 10, and the tip portion 43a of the inward horizontal portion 43 of the elbow support 40 is a block It is fixed to the lower surface of the side support portion 37a with a screw (bolt) 46 via a spacer 45 having a shape. Therefore, the side support portion 37a serves as an armrest attachment portion, and has two front and rear screw holes 47 into which screws 46 are screwed. The side support portion 37a of the seat receiving member 12 has a rectangular shape in a plan view with approximately the same front-to-rear width as the spacer 45, and therefore has the same front-to-rear width as the inward horizontal portion 43 of the elbow support 40 as well.

Two screws 46 are arranged in the front and rear. Although it is possible to arrange two screws 46 on the left and right sides, in this case, the left and right width of the spacer 45 becomes large, and there is a possibility that the compactness is lacking. On the other hand, in the embodiment, since the screws 46 are arranged in the front and rear directions, the lateral width of the spacer 45 can be reduced. As a result, the peripheral portion of the spacer 45 can also be made compact.

As shown in FIG. 10(C), the inward horizontal portion 43 of the elbow support 40 is inclined in a side view so that the front side is low and the rear side is high. On the other hand, the rear stay 37 is horizontal when viewed from the side. Therefore, the spacer 45 has a trapezoidal shape when viewed from the side so that the front side is thicker and the rear side is thinner.

As shown in FIG. 10A, a pair of front and rear lower positioning projections 48a protrude downward from the lower surface of the spacer 45. On the other hand, as shown in FIG. A pair of front and rear engagement grooves 48b into which the lower positioning projections 48a are fitted are formed in the bottom. In this case, the inward horizontal portion 43 is formed with a pair of right and left engaging grooves 48b, and a pair of left and right screw insertion holes 49 are also formed. Therefore, the attachment position of the armrest device 4 can be shifted left and right. As shown in FIG. 10(A), the lower positioning projections 47 are provided close to the spacer 45 side, but they may be provided at the left and right intermediate portions.

A pair of left and right upper positioning projections 50 protrude upward from the upper surface of the spacer 45 . Correspondingly, the side support portion 37a of the rear stay 37 is provided with a positioning hole 51 into which the upper positioning projection 50 is fitted. The downward moment acting on the elbow support 40 acts on the spacer 45 as a force that causes it to rotate downward around the edges near the bases 9 and 10 in a front view. If the upper positioning protrusions 50 are provided with left and right separation, the upper positioning protrusions 50 act as a strong resistance to the positioning holes 51 against the moment acting on the inward horizontal portion 43, so the screws 46 are arranged in the front and rear directions. Even if it does, high fastening strength can be ensured.

In addition, since the elbow support 40 is tilted forward, a downward force acting on the elbow support 42 acts on the elbow support 40, causing an external force to tilt the elbow support 40 forward. A similar (or twisting) external force acts. Thus, when the front and rear lower positioning projections 47 are provided as in the embodiment, the front and rear lower positioning projections 47 act as resistance to the rotation of the elbow support 40 about its axis. Also in this aspect, high fastening strength can be ensured.

(4) Relationship between Spacer and Seat Outer Shell As shown in FIG. 8, the right and left sides of the seat main outer shell 20 are formed with longitudinal downward projections 53 that extend substantially over the entire front -to-rear length. The downward protrusion 53 is for guiding the seat front outer shell 21 so as to be movable back and forth, and guide portions provided on both left and right sides of the seat front outer shell 21 are fitted from above.

7, the bases 9 and 10 are arranged between the left and right downward protrusions 53 of the seat main outer shell 20, and therefore the seat support member 12 is basically the same as that of the seat main. The outer shell 20 is fitted in the space between the left and right downward protrusions 53, and as can be understood from the line indicated by reference numeral 54 in FIG. It is fixed to member 12 .

However, since the left and right side support portions 37a provided on the rear stay 37 of the seat receiving member 12 protrude outside the bases 9 and 10, as can be understood from FIG. form a recess 55 into which the side support portion 37a and the spacer 45 and the inward horizontal portion 43 of the armrest device 4 enter. Therefore, the side support portions 37a of the seat receiving member 12, the spacers 45, and the inward horizontal portion 43 of the armrest device 4 are surrounded by the downward projections 53 of the seat main outer shell 20 from the front and rear.

Since the side support portions 37a, the spacers 45, and the inward horizontal portions 43 of the armrest device 4 are inserted into the recesses 55 of the downward protrusions 53 of the seat main outer shell 20, the seat main outer shell 20 is not positioned as shown in FIG. The lower surface of the downward protrusion 53 in , and the lower surface of the tip portion 43a of the inward horizontal portion 43 in the armrest device are substantially at the same height. Therefore, the inward horizontal portion 43 looks as if it is a part of the seat main outer shell 20, which is excellent in appearance.
As shown in FIG. 7B, when the armrest device 4 is not attached, the recessed portion 55 of the seat main outer shell 20 is closed with a cap 56 .

As clearly shown in FIG. 6 , the downward protrusion 53 of the seat main outer shell 20 is formed with a relief groove 57 positioned in front of the recess 55 and having a semicircular shape in a side view. As can be understood from FIG. 8, this relief groove 57 is intended not to interfere with the rotating operation of the handles 14 and 15. As shown in FIG. The front stay 36 of the seat receiving member 12 also protrudes outside the vertically long frame 35, but as shown in FIG. A notch 58 is formed.

In the above-described embodiment, the side support portion 37a is in a state in which the rear stay 37 is simply extended laterally, and the spacer 45 is used for this purpose . In addition, it is also possible to form the side support portion 37a in a stepped state on the outside of the base 9 and directly attach the inward horizontal portion 43a to the side support portion 37a.

In the drawing, the side support portion 37a and the inward horizontal portion 43a are drawn with a slight gap, but this is a convenient measure for clearly displaying the lines. Actually, the side support portion 37a has a height such that the inward horizontal portion 43a at a normal height overlaps from below.

When the side support portion 37a has a stepped structure, the posture in side view should be matched with the side view shape of the upper surface of the inward horizontal portion 43a. Therefore, the posture is not limited to the horizontal posture when viewed from the side, and may be a posture tilted forward, a posture tilted backward, or a chevron posture when viewed from the side. The side support portion 37a may be formed by bending a member such as the rear stay 37, or may be manufactured as a separate member and then fixed by welding.

(5) Others In the above embodiment, the seat receiving member 12 is configured in a frame shape composed of the left and right longitudinal frames 35 and the front and rear stays 36, 37, but it may be a flat plate-like structure. In addition, instead of sheet metal products, resin molded products and metal die-cast products can also be used. The side support portion may extend in the front-rear direction.

Non-height-adjustable armrest devices may have two front and rear elbow braces. It should be fixed to the support. In this case, the spacers may be separated fore and aft, or one spacer may be shared for attachment of the front and rear elbow struts.

The present invention can also be applied to a chair whose seat does not synchronize with the backrest when rocking. Therefore, it can be applied even when the base portion is composed only of the fixed base.

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

REFERENCE SIGNS LIST 1 leg device 2 seat 3 backrest 4 armrest device 7 leg support 9 fixed base 10 tilting base 11 spindle 12 seat support member 13 back support frame 19 seat outer shell as an example of an intermediate support 20 seat main outer shell 35 seat support member 36 Front stay of seat receiving member 37 Rear stay of seat receiving member 37a Side support portion ( armrest mounting portion)
40 Elbow strut 41 Lifting body 42 Elbow rest 43 Inward horizontal part 45 Spacer 46 Screw 47 Screw hole 48a Lower positioning projection 48b Lower positioning groove 50 Upper positioning projection 51 Positioning hole 53 Downward projection of seat main outer shell 55 Recess

Claims (4)

A seat support member is supported by a base provided at the upper end of the leg support, and the seat is attached to the seat support member via an intermediate support. A configuration that is tiltably connected,
The intermediate support has ribs on its upper surface and is formed in the shape of a shell that opens upward. A side support portion is provided, and the side support portion serves as an armrest mounting portion capable of fixing the inwardly directed horizontal portion of the armrest device from below via a spacer arranged on the lower surface of the side support portion,
The intermediate support is formed with downwardly projecting longitudinally extending downward projections on both left and right sides of the base. the spacer and the inwardly directed horizontal portion of the armrest device form a recess that enters from below;
Chair. A plurality of tapped holes for fixing the inwardly facing horizontal portion of the armrest device are formed in the side support portion and aligned in the front-rear direction. are formed side by side,
A chair as claimed in claim 1. The mounting position of the inward horizontal portion with respect to the side support portion can be selected from a plurality of positions in the left and right direction,
A chair according to claim 1 or 2. A seat support member is supported by a base provided at the upper end of the leg support, and the seat is attached to the seat support member via an intermediate support. A configuration that is tiltably connected,
The intermediate support has ribs on its upper surface and is formed in the shape of a shell that opens upward. A side support is provided, and the inward horizontal portion of the armrest device is fixed to the lower surface of the side support via a spacer,
The intermediate support is formed with downwardly projecting longitudinally extending downward projections on both left and right sides of the base. the spacer and the inwardly directed horizontal portion of the armrest device form a recess that enters from below;
Chair.

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