JP5096998B2 - Chair - Google Patents

Description

  The present invention relates to a chair having a backrest.

  As a type of chair with a backrest, there is a relatively simple structure (so-called pipe chair) in which a frame (leg) is made up of pipes, so that people only have a relatively short time for meetings and business meetings. Often used when sitting.

And as a method of attaching the backrest in this type of chair, for example, in Patent Document 1, a pair of left and right back posts are erected on the back side of the seat, while the right and left sides of the backrest are fitted with the back posts Is formed, and the backrest is inserted into the back column so as to be immovable from front to back and from side to side.
JP 2007-202591 A

In Patent Document 1, there is an advantage that the positioning of the backrest can be accurately performed and the assembly work of the chair can be easily performed, but the strength is concerned. That is, in Patent Document 1, since the entire back strut is inserted into the hole in the backrest, the back strut must be in a cantilever state with the upper end of the back strut as a free end. It is not possible to take measures to fix and reinforce, and since the backrest may not be able to increase the thickness of the back and forth due to constraints such as design , it may be difficult to make the back struts thicker, For this reason, anxiety remains in the support strength of a back column (or attachment strength of a backrest).

  The main object of the present invention is to improve the current situation.

The structure of the present invention is specified in each claim. Among these, the chair according to the invention of claim 1 includes a seat, a backrest, and left and right back struts arranged to face the left and right outer side surfaces of the backrest, and the backrest is the backrest. a configuration which is held dynamic non and lateral movement impossible preceding and by fitting the other in longitudinal groove provided in Le, the backrest is provided with a net Jose sheet overlying said longitudinal groove, wherein By pushing the back seat into the vertically long groove by the back support, a tension in the left-right direction is applied to the back seat.

  A chair according to a second aspect of the present invention is the chair according to the first aspect, wherein a left and right laterally long rear frame that constitutes a leg portion is disposed below the backrest, and is fitted to the lower surface of the backrest from above the reinforcing frame. An inner frame extending forward is integrally fixed to the reinforcing frame, and a notch for avoiding interference with the inner frame is formed at a lower end portion of the backrest. Is forming.

A chair according to a third aspect of the present invention is the chair according to the first or second aspect, wherein the back strut is made of a circular pipe or bar, and the backrest is connected to the back frame of the front and rear opening having left and right side members. The backrest is fitted to the back strut so that it cannot be moved back and forth and left and right by forming a vertically long groove that fits the back strut on the outer surface of the left and right side members. It is case.

Chair according to the invention of claim 4, in any one of claims 1 to 3, wherein the back post, while being fixed to the arranged side frames on the left and right sides of the seat, the lower end of the backrest Is fixed to a frame material provided in the vicinity of the lower end of the backrest.

  In the present invention, since the back strut is exposed to the left and right outside of the backrest, the back strut is, for example, a reinforcing means that is fixed to the side frame as in claim 4 or a double system that is erected on the left and right. Therefore, it is possible to take a reinforcing means, and as a result, the back strut can ensure high support strength.

  If the structure of Claim 2 is employ | adopted, since the backrest is fitted in the rear frame also in the lower part, it can ensure still higher support strength. More specifically, the inner frame is fixed to the rear frame to ensure high rigidity as a whole chair. However, in claim 2, a notch for avoiding interference with the inner frame is formed in the lower part of the backrest. Therefore, it is possible to improve the support strength of the backrest while ensuring high rigidity in the frame of the chair, which is an excellent advantage of the second aspect.

As a chair back , there is a structure in which a net-like back seat is stretched on a back frame, and this type of back has an advantage of excellent breathability and fit. However, there is a case where the back sheet is not stretched. In this regard, in the present invention, even if the back seat is not stretched in the state of only the backrest, when the backrest is attached to the back column and assembled as a chair, the back seat can be stretched to the left and right at the height position of the back column. As a result, a high-quality chair excellent in fit can be provided.

  On the backrest, not only a rearward external force, but also a moment that tilts the upper part back may be applied. Therefore, when the backrest is fixed to the back column or the like, it is preferable to take into account the tilting action. In this regard, if the configuration of claim 4 is adopted, the backrest is fixed not only at the left and right end portions but also at the lower end portion, so that a high supporting strength against the backrest load can be obtained.

Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to a four-legged chair (pipe chair) that is frequently used for a short time such as a meeting or a meeting. First, an overall outline will be described based on FIGS. 1 and 2, and then the details will be described.

(1) Outline In FIG. 1, (A) is an overall perspective view of the chair, (B) is a sectional view of the seat as viewed from IB-IB in FIG. 2, and FIG. 2 is an exploded perspective view. As can be seen, the chair includes two left and right front legs 1, left and right two rear legs 2, a seat 3, and a backrest 4.

  The left and right hind legs 2 are connected to each other by a horizontally long rear frame 5 at the upper part thereof, and the rear frame 5 and the upper parts of the left and right front legs 1 are connected by an inner frame 6 having a substantially L shape in plan view and having a longitudinal longitudinal part. Further, the front and rear longitudinal portions of the left and right inner frames 6 are connected to each other by a flat plate-like front stay 7 and rear stay 8 at two locations, a front portion and a rear portion. The left and right inner frames 6 are provided with plate-shaped inwardly facing pieces 9 in front of the rear stay 8.

  As shown in FIG. 1B, the seat 3 has a structure in which a cushion 3b is stretched on a board (seat board) 3a made of plywood, and the board 3a is fixed to a front stay 7 and an inward piece 9 with screws 11. ing. A nut 12 is attached to the substrate 3a so as not to be detached.

  A back column 13 projecting upward from the seat 3 is continuous with the upper end of the rear foot 2 in a posture slightly inclined forward with respect to the vertical line, and the upper end of the back column 13 is an overhanging portion 13a spreading outward in the left and right directions. The bend is formed. At the upper ends of the left and right forefoot 1, an elbow support portion 14 that is gently curved above the seat 3 and extends rearward is integrally connected, and an overhanging portion 13 a of the back strut 13 is formed at the rear end of the elbow support portion 14. The two are welded together. Each member is fixed by welding. The elbow support portion 14 is an example of a side frame described in claims, and a long elbow rest 15 is attached to the front and rear thereof.

  Further, a frame of the main body is constituted by the front foot 1 integrally formed with the elbow support portion 14, the rear foot 2 integrally formed with the back strut 13, the reinforcing frame 5, and the front and rear stays 7 and 8. Casters are attached to the lower ends of the feet 1 and 2. The front and rear legs 1, 2, the rear frame 5, and the inner frame 6 are each made of a round pipe having the same diameter. Therefore, the back strut 13 and the elbow support 14 are also the same diameter as the legs 1, 2 and the frames 5, 6. It has become.

(2). Summary of the structure of the backrest then the backrest 4 will be described with reference also to FIG 3. 3A is an exploded perspective view of members constituting the backrest 4, and FIG. 3B is a cross-sectional view taken along line BB of FIG. As can be understood from FIG. 3, the backrest 4 includes a resin back frame 17 and a back seat 18 attached to the resin back frame 17. The back frame 17 includes left and right side members 19 that are vertically long and side members 19. The upper member 20 is integrally connected to the upper end of the upper member 20, and the lower member 21 is a member separate from the side member 19. The left and right side members 19 and the upper member 20 are continuous integrally, and the lower member 21 is independent.

  The back sheet 18 is formed in a net shape by knitting or weaving a tough yarn as a raw material, and its left and right side portions are formed in a side tube portion 18a into which the side member 19 is fitted, and the upper end portion is formed by an upper member 20. It is formed in the upper cylinder part 18b which fits, and the lower end is formed in the lower cylinder part 18c in which the lower member 21 fits. Needless to say, the adjacent cylindrical portions 18a, 18b, 18c communicate with each other. Two left and right attachment holes 22 through which the back frame 17 can be inserted are opened forward at two positions near the left and right ends of the lower cylinder portion 18c.

  The side member 19 of the back frame 17 is bent in a side view so that the lower half is tilted forward and the upper half is tilted backward with respect to the vertical line, and the upper member 20 and the lower member 21 are It is gently curved in a concave shape facing forward in plan view. Therefore, the back seat 18 protrudes most forward at the bending apex portion of the side member 19 and is curved in a forward concave shape as a whole in plan view.

Each cylindrical portion 18a, 18b, 18c of the back seat 18 is formed in a seamless state by three-dimensional knitting (or three-dimensional weaving), and has a front view configuration corresponding to the shape of the members 19, 20, 21 as the counterpart members. Yes. The cylindrical portions 18a, 18b, and 18c can be formed by soldering or welding.

(3). Details of the backrest Further, the backrest 4 will be described with reference to the drawings in FIG. 4A is an exploded perspective view of the back frame 17 alone, FIG. 4B is a partially broken perspective view of the backrest 4, and FIG. 5 is a view taken along the line VV in FIG. 2 with the back seat 18 omitted. 6A is a cross-sectional view taken along the line VIA-VIA in FIG. 5, FIG. 6B is a cross-sectional view taken along the line VIB-VIB in FIG. 5, and FIG. 7 is a sectional view taken along the line VIIA-VIIA in FIG. 2, (B) is a sectional view taken along the line VIIB-VIIB in FIG. 1, and FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. FIG. 9 is a cross-sectional view, and FIG.

As can be understood from FIGS. 5 and 7, the side members 19 forming the back frame 17 has become a flat cross section chevron form as thickness about degree go inside it becomes thin and front backrest 4 Inclined loosely toward the vertical centerline. As shown in FIG. 5 and FIG. 7, a substantially semicircular vertically long groove 23 that fits into the back column 13 from the inside is formed in the lower half of the side member 19 in the forward inclined posture. The vertically long groove 23 is open downward.

  Therefore, the backrest 6 is held so that it cannot be displaced back and forth and left and right. Further, when the side member 19 is fitted into the back column 13 from above, the side cylinder portion 18a of the back seat 18 is pushed into the inside of the vertically long groove 23. Tension is applied. In the present embodiment, since the outwardly projecting portion 13a is formed at the upper end of the back column 13, the outwardly projecting portion 13a serves as a guide when the backrest 4 is fitted into the back column 13 by moving downward. The fitting is performed smoothly.

Of Ceci over preparative 18, a portion excluding a portion overlapping the portion and lower member 21 overlaps the back pillar 13 is bonded to the back frame 17 by an adhesive such as hot melt adhesive. For this reason, there is no inconvenience that the back sheet 18 is displaced on the surface of the back frame 17 to deteriorate the aesthetic appearance.

  The side member 19 of the back frame 17 is fixed to the upper bracket 24 welded to the rear end of the elbow receiving portion 14 with screws (bolts) 25. As shown in FIGS. 8 and 9, the side member 19 includes a recess 26 into which the upper bracket 24 enters from behind, a front and rear opening screw hole 27 communicating with the recess 26, and a forward opening nut communicating with the screw hole 27. A holding hole 28 is formed, and a screw 25 is screwed into a hexagonal nut 29 that is non-rotatably fitted in the nut holding hole 28.

  Note that the nut 29 is fitted in the nut holding hole 28 before the back seat 18 is attached, and is thus held by the back seat 18 so as not to fall off. The upper bracket 24 is covered with an end cap 30, and the end cap 24 is fitted into the elbow receiving portion 14 from behind and is held by the elbow rest 15 so as not to be removed.

  For example, as shown in FIG. 6, the lower member 21 is formed in a substantially chevron shape whose front and rear thickness decreases as it goes up, and a substantially semicircular horizontally long groove 32 that fits into the reinforcing frame 5 is formed on the lower end surface. Has been. In addition, a lower groove 33 into which the rear frame 5 is fitted is formed at the lower end of the side member 19. Therefore, the lower groove 33 of the side member 19 and the horizontally long groove 32 of the lower member 21 are connected in series. Further, at the lower end of the side member 19, a superposed portion 19 a having the same side cross-sectional shape as the lower member 21 is formed so as to protrude slightly inward.

  For example, as shown in FIGS. 5 and 6A, the left and right end surfaces of the lower member 21 overlap with the receiving frame 5 from above and enter into the overlapping portion 19a of the side member 19 in a plan view substantially in the shape of a mountain. 34 is formed on the upper inner surface of the lower groove 33 of the side member 19, and a downward stopper recess 35 into which the stopper projection 34 fits tightly is formed, and the stopper projection 34 is connected to the screw (tapping screw). ) 36 is fixed to the stopper recess 35. Therefore, the posture and position of the lower member 21 and the side member 19 are held constant, and the entire shape of the back frame 17 is held. Needless to say, the stopper protrusion 34 has a screw hole 37.

  As shown in FIGS. 2 to 4, the lower member 21 is formed with a notch 38 having a substantially semicircular shape and opening downward for avoiding interference with the inner frame 6. A pair of left and right lower brackets 39 that overlap the rear stay 8 from above are integrally formed slightly inside the notch 38, and the rear stay 8 and the lower bracket 39 are fastened by screws 40. The screw 40 uses a tapping screw and is inserted into the rear stay 8 from below and screwed into the lower bracket 39, but can be fastened using a nut. 4B, the lower bracket 39 is exposed to the outside from the mounting hole 22 of the back seat 18. As shown in FIG.

(4) Summary In order to assemble the backrest 4 in the above configuration, first, as shown by a one-dot chain line in FIG. 3, first, an integral part of the side member 19 and the upper member 20 is attached to one of the back seats 18. inserted from the mounting hole 22, by the this for relatively moving the back sheet 18 and the integrated portion is fitted to the back sheet 18 integral portion in a predetermined posture.

Next, the lower member 21 is inserted into one of the attachment holes 22 into the lower cylinder portion 18c, and the lower cylinder portion 18c is extended in the left-right direction, so that the lower member 21 is fitted into the lower cylinder portion 18c. The member 21 is fastened to the side member 19 with a screw 36. The notch 38 and the lower bracket 39 of the lower member 21 are exposed from the mounting hole 22.

  Then, by shifting the backrest 4 downward, the longitudinal groove 23 of the side member 19 is fitted into the back column 13, and the lower member 21 is fitted into the rear frame 5. In this state, the side member 19 is fitted to the upper bracket 24 with screws 25. At the same time, the lower bracket 39 of the lower member 21 is fastened to the rear stay 6 with screws 40. Thereby, the attachment of the backrest 4 is completed.

  And since the upper end of the back column 13 is welded to the elbow support portion 14, even if it is made of a pipe having the same diameter as the rear foot 2 etc., extremely high support strength is maintained, and as a result, the backrest 4 is It can be supported firmly. It is possible to screw a screw penetrating the back column 13 into the side member 19 as a means for fixing the backrest 4. However, when the screw is fixed to the upper bracket 24 overlapping the back side of the side member 19 as in this embodiment, the back column is fixed. Since it is not necessary to make a hole in 13, strength reduction can be prevented. Further, since the upper bracket 24 is covered with the end cap (cover) 30, the aesthetic appearance is not deteriorated.

  Further, since the back frame 17 is fastened to the upper bracket 24, the backrest 4 is held so as not to be detached upward. Further, since the lower member 21 is fastened to the rear stay 8 with screws 40, the back frame 17 is fixed so that it cannot be displaced forward and backward at the lower end thereof. Can do. Further, since the lower member 21 is held in a state of being fitted to the reinforcing frame 5, it is ensured that the vertical tension is applied to the back seat 18.

As in the present embodiment, on the end portions of the side members 19 of the lower member 21 fits in the up and down direction as the boss portion 36 with a stopper groove 35 and the engaging hole 37 with the stopper protrusion 34 the provision of positioning means fits, the backrest 4 is convenient in assembling work to be held in a predetermined state, without directly fastened to with screws or the like and a lower member 21 and the side members 19, the back frame 17 There is an advantage that the form can be maintained. Further, if the lower bracket 39 is provided integrally with the lower member 21, there is an advantage that the structure is simplified accordingly.

(5). Others present invention can be in addition to various concrete than the above embodiment.

Specific form of framework structures backrest is attach may vary, for example, those forming the leg side view rearward U-shape and to form left and right leg side view mouth shape as in Patent Document 1 It can also be applied to things.

When the side frame (elbow receiving portion 14) is provided as in the above embodiment, the back strut and the side frame can be formed in a continuous state with a single pipe material .

  The target chair is not limited to the four-legged type as shown in the figure. For example, a chair in which the left and right leg frames are formed in a lateral U shape in a side view, and a left and right leg frame in a side view The present invention can be applied to various types of chairs such as a chair formed in a braille shape (or a trapezoidal shape), or a rotary chair in which a leg column is formed of a gas cylinder. Needless to say, in the case of pipe chairs, it is possible to fit a plurality of pipe chairs in the front-rear direction or to stack them vertically.

(A) is an overall perspective view of the chair, and (B) is a sectional view of the seat as viewed from IB-IB in FIG. It is a separation perspective view of a chair. (A) is the isolation | separation perspective view of a backrest, (B) is BB sectional drawing of (A). (A) is a separated perspective view of only the back frame 17, and (B) is a partially broken separated perspective view of the backrest 4. FIG. 5 is a cross-sectional view taken along the line VV in FIG. 2 with the back seat omitted. (A) is a cross-sectional view taken along the line VIA-VIA in FIG. 5, (B) is a cross-sectional view taken along the line VIB-VIB in FIG. 5, and (C) is a cross-sectional view of the assembled chair as viewed from the VIC-VIC view direction in FIG. It is. (A) is a sectional view taken along the line VIIA-VIIA in FIG. 2, and (B) is a sectional view taken along the line VIIB-VIIB in FIG. FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 1. It is a separated top view which shows the attachment structure of a backrest.

1 Front foot 2 Rear foot 3 Seat 4 Backrest 5 Rear frame 6 Inner frame 8 Rear stay (frame material)
14 Elbow support part as an example of side member 17 Back frame 18 Back seat 19 Back frame side member 21 Back frame lower member 23 Side member longitudinal groove 24 Upper bracket 32 Lateral groove 38 Notch 39 Lower bracket

Claims (4)

Fitting a seat, a backrest, and a arranged left and right back post so as to face the left and right outer sides of said back, said seat back, said back posts in longitudinal grooves in which the back is also provided on the Re other It is configured to be held so that it can not move back and forth and left and right by combining ,
The backrest is provided with a net-like back sheet that covers the vertically long groove, and by pushing the back sheet into the vertically long groove by the back strut, a lateral tension is applied to the back sheet.
Chair. Wherein below the backrest is arranged a rear frame of the left and right horizontal constituting the leg, the lower surface of the backrest forms a full oblong groove fitted from above to the rear frame, further to the rear frame The inner frame extending forward is integrally fixed, and a lower end of the backrest is formed with a notch for avoiding interference with the inner frame.
The chair according to claim 1. The back strut is made of a circular pipe or bar, while the backrest has a structure in which a net-like back seat is attached to a back frame of front and rear openings having left and right side members. of by the back posts to form a whole longitudinal groove fitted on the outer surface, the backrest is moving impossible and lateral movement impossible fitted front and rear with respect to the back post,
The chair according to claim 1 or 2. The back post, while being fixed to the arranged side frames on the left and right sides of the seat, the lower end of the backrest is fixed to the frame member provided in the vicinity of the lower end of the backrest,
The chair as described in any one of Claims 1-3.