JP2009106422A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nesting chair having an excellent appearance of flipped up seat and having a high load-supporting strength. <P>SOLUTION: The chair has a frame device allowed to be fitted back and forth. A seat 3 is constituted by an inner shell 20 lined with a cushion 21, an outer cover 17 disposed under the inner shell 20, and a core member 22 disposed between the inner shell 20 and the outer cover 17. The core member 22 is connected to lateral spindles 16 of the back frame 2, and the inner shell 20 and the outer cover 17 are held at the core member 22 so as not to be removed. The moment caused by seating is supported by a support body 18. Presence of the core member 22 secures a high bearing strength, and the flipped up seat has an excellent appearance due to exposure of only the outer cover 17. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a chair that can turn up and turn a seat, and is particularly suitable for a non-rotating chair of a type that is movable and that can be fitted back and forth (nested).

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

  In Patent Document 1, the leg is a four-leg system. The left front leg and rear leg, and the right front leg and rear leg are connected by the upper horizontal part, and the left and right upper horizontal parts are connected by the horizontally long stay. Further, the left and right rear legs protrude upward from the seat, and the seat and the backrest are respectively attached to the upward protrusions of the rear legs via brackets. The seat mounting structure will be further described. A seat receiving bracket having a front and rear longitudinally substantially L-shape in front view is attached to the upward projecting portion of the rear foot so as to be freely pivoted, and the seat is fixed to the seat receiving bracket. Further, when the seat is tilted horizontally, it is supported by the front portion of the upper horizontal portion. Further, by narrowing the left-right distance between the two front legs to the left-right distance between the two rear legs, the nesting can be performed when the seat is flipped up.

In Patent Document 1, the seat includes a seat frame that is substantially quadrilateral in plan view and opens up and down, a seat plate (inner shell) supported by the seat frame, and a cushion that is stretched on the upper surface of the seat plate. The frame is fixed to the seat bracket. That is, in Patent Document 1, the seat frame functions as a strength member that supports the seating load.
Japanese Patent Laid-Open No. 2001-128776

  Of course, in a chair that can be lifted up, the back of the seat will be visible to the human eye when the seat is lifted up. Therefore, the aesthetic appearance in the state of being flipped up is also important. However, in Patent Document 1, the seat frame, the seat plate, and the like are exposed while the seat is flipped up, so that it cannot be said that the beauty is good. In Patent Document 1, the seat bracket is made of a metal plate, and therefore, the appearance of the seat bracket is hidden by covering it with a cover, but the seat frame and seat plate remain exposed. It cannot be said that the beauty of the whole seat is excellent.

  In addition, when trying to ensure a certain level of aesthetics at the time of flip-up, the seat plate and the seat frame must be subjected to cosmetic treatment, and there is a risk that the seat function will be restricted and processing will be troublesome. is there.

  This invention is made | formed in view of such the present condition, and makes it the subject to provide the chair which has the improvement points, such as being excellent in aesthetics even if the seat is flipped up.

  The chair according to the present invention has a seat, a backrest, and a frame device to which these are attached, and is said to be connected to the frame device so that the seat can be swung up and rotated around its rear part. Basic configuration. In the invention of claim 1, the seat is made of a resin inner shell that can be sunk downward and deformed by a human seat, a cushion stretched on the upper surface of the inner shell, and an outer cover that covers the inner shell from below. And have.

  The present invention includes various configurations, examples of which are given in claims 2 to 4. Of these, the invention of claim 2 is the invention according to claim 1, wherein a metal core member as a strength member for supporting a load applied to the inner shell is disposed between the inner shell of the seat and the resin outer cover. The core member is pivotally connected to the frame device, and the frame device is provided with a support body that supports the seat from below on the front side of the pivot center. The receiving part of the core member and the support body overlap with each other via the outer cover in a state where the core member is tilted, and the inner shell is sinked downward between the receiving part of the core member and the inner shell of the seat. A space allowing deformation is vacant.

  According to a third aspect of the present invention, the frame device further embodies the second aspect. In the present invention, the frame device includes a leg disposed with a space between the seat and a leg, and the left and right outer sides of the seat rising from the leg. A leg frame extending substantially upwardly through the legs, and the legs are non-targeted so that the chairs arranged in the front and rear can be fitted together when the seat is flipped up. Alternatively, the left and right laterally long support bodies are provided on the legs so as to contact the outer cover on the inner side of the right and left edges of the seat.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the lateral support shafts for connecting the core members of the seat are provided opposite to the side support columns located on both sides of the back frame of the back frame. On the other hand, the outer cover of the seat has an upward concave shape so as to cover the core member from below, and the left and right side portions have curved cross-sectional shapes, and the outer cover is directed downward on the left and right side portions of the outer cover. The core member is connected to the lateral support shaft by a bolt inserted from the inner side of the outer cover.

  In the present invention, since the lower surface portion of the seat is composed of an outer cover, when the seat is flipped up, the outer cover only touches the human eye, and the inner member such as the inner shell does not touch the human eye. The aesthetics at the time of jumping can be greatly improved.

  In addition, since the inner shell is not visible from the outside, the inner shell can be processed and processed without worrying about beauty. For example, it is possible to form a slit for enhancing cushioning and fitting properties. Also, the insert can be molded with the inner shell formed with a large number of holes and slits, thereby reducing the work of the seat. Furthermore, a core member as a strength member can be arranged between the inner shell and the outer cover as in claim 2, but in this case, since the core member is not visible from the outside, its shape, material, etc. should be considered aesthetic. And can be arbitrarily set, and a cosmetic treatment such as painting can be omitted. Thus, according to the present invention, the function of the chair can be improved while ensuring the aesthetic appearance when the seat is flipped up.

  It is also possible to adopt a structure in which the outer cover has a function as a strength member and the seating load acting on the inner shell is supported by the frame device through the outer cover. When the core member as a member is provided, the load supporting function and the cosmetic function can be shared by the core member and the outer cover, so that the design freedom of the chair can be greatly expanded. In addition, since the outer cover is sandwiched between the core member and the support body in a state where the seat is tilted horizontally, a load (for example, bending moment) due to the seating does not act on the outer cover greatly. The outer cover can be made thinner and lighter.

  In Patent Literature 1, the upper end of the front foot and the upper end of the rear foot are connected to each other, and the leg has an upper horizontal portion, and the upper horizontal portion supports the left and right side portions of the seat. It extends to the lower surface of the side. However, in this configuration, when the seat is flipped up, a person must place a hand on the front part of the periphery of the seat with respect to the upper horizontal portion. In order to prevent a finger from being pinched, a person has to put a hand on a portion of the periphery of the seat in front of the upper horizontal portion, and thus the rotation operation of the seat has been a little troublesome.

  On the other hand, if the structure of Claim 3 of this application is adopted, since the peripheral part of the seat is a space except for the attachment part with the back frame, a person can put any hand on the peripheral part of the seat. It can be safely rotated. Therefore, it is possible to reduce the burden on the person when the seat is rotated (thus, it can be said that a kind of universal design is realized).

  In Patent Document 1, the seat bracket is attached to the boss portion of the rear foot with bolts screwed in from the left and right inner sides, and the seat frame overlaps the seat bracket from above. The bolts for mounting are not exposed to the outside. However, the cover covering the seat bracket is exposed to the outside.

  On the other hand, in the invention of claim 4 of the present application, the core member is attached to the laterally supporting shaft of the back frame inside the outer cover. Therefore, when the seat is flipped up, the laterally supporting shaft is the hole of the outer cover. The other members are not exposed to the outside of the outer cover. For this reason, it is only the lower surface of the outer cover that touches the human eye in a state in which the seat is flipped up, and thus the appearance is very refreshing. This is the excellent advantage of claim 4.

(1). Basic Configuration of Chair Next, an embodiment of the present invention will be described based on the drawings. First, the basic configuration of the chair will be described with reference to FIGS. 1A is a front view, FIG. 2B is a plan view, FIG. 3C is a side view, FIG. 3 is a bottom view, and FIG. 4 is a side view showing a nesting state. 5 is a separated front view.

  The chair includes a leg 1, a back frame 2, a seat 3 and a backrest 4 as main elements, and the seat 3 and the backrest 4 are attached to the back frame 2. The leg device 1 and the back frame 2 constitute a frame device (framework) described in the claims. Further, an armrest 5 as an optional product is also attached to the back frame 2. The back frame 2 is fixed to the upper end of the leg 1, and the seat 3 is attached to the back frame 2 so that the seat 3 can be flipped up around the rear part at a position above the leg 1. Therefore, a space 6 having a certain size (for example, about several centimeters to 10 centimeters) is vacant between the upper end of the leg 1 and the seat 3 in the tilted state.

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

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

  The left and right front legs 7 and the left and right rear legs 8 are integrally connected (coupled) via converging parts 7c and 8c including upper horizontal parts 7a and 8a, respectively. The converging part 8c is fixed to each other. Therefore, the front foot 7 and the rear foot 8 form a V shape (or a dogleg shape) in a side view. A cover 10 is provided on the convergence portions 7c and 8c.

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

  For example, as apparent from FIG. 2 (A), the distance between the front legs 7 is smaller than the distance between the left and right legs of the rear legs 8 as a whole. Since the distance between the front legs 7 is smaller than the distance between the rear legs 8 in this way, when the seat 3 is flipped up, a large number of chairs can be nested in front and back as shown in FIG. That is, the front foot 7 of the chair positioned at the back can be fitted between the left and right rear feet 8 of the chair positioned at the front. It should be noted that the left-right distance of the front foot 7 can be made larger than the left-right distance of the rear foot 8.

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

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

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

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

  Opposite lateral support shafts 16 project from the lower ends of the left and right side columns 2a, and the seat 3 is connected to the lateral support shafts 16 so as to be able to flip up and rotate. On the other hand, the lower surface of the seat 3 is constituted by a resin outer cover 17. Since the seat 3 rotates around its rear part, a large moment acts on the seat 3 by the seating. Therefore, a portion of the seat 3 closer to the front side than the rotation center is supported by a left and right longitudinal support body 18 extending obliquely forward from the back frame 2. The support body 18 is welded to the back frame 2.

(2) Details of Seat Next, the structure of the seat 3 will be described with reference to FIG. 6 is a plan view, FIG. 7 is a partially omitted plan view of the seat 3, FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 6, and FIG. 9A is a sectional view taken along line IX-IX in FIG. (B) is a sectional view taken along the line IX-IX of FIG. 6 at the front part of the seat 3, FIG. 10 is a longitudinal side view of the rear part of the seat 3, and FIG. 11 (A) is a sectional view taken along the line XI-XI of FIG. (B) is a BB arrow line view of (A).

  As can be understood from FIG. 9, for example, the seat 3 includes the outer cover 17 described above, the resin inner shell 20 disposed above the outer cover 17, a cushion 21 stretched on the upper surface of the inner shell 20, and the inner shell 20. A metal core member 22 disposed between the outer cover 17 and the outer cover 17 is provided. The cushion 21 is covered with a skin such as a cloth but is not shown in the drawing.

  The inner shell 20 and the outer cover 17 have substantially the same planar shape, and basically have a shape close to a quadrangle. To be precise, the left and right widths of the rear part are slightly smaller than the left and right widths of the front part, and the front end and the rear end are gently curved in plan view. Needless to say, the planar shape of the seat 3 can be arbitrarily set according to a request for design or the like.

  The inner shell 20 is formed with a number of slits for allowing extension deformation due to a downward load caused by sitting. The specific form of the slit is the same as that disclosed in FIG. 9 of Japanese Patent Application Laid-Open No. 2003-88442 related to the application of the present applicant, for example, and is formed in the longitudinal longitudinal direction formed in the left and right intermediate part of the inner shell 20. A group of center slits, a group of front and rear side slits formed on the left and right sides of the inner shell 20, and a group of main slits in an inclined posture positioned between the center slit group and the side slit group. It is configured. In FIG. 9 of the present application drawing, the center slit is indicated by reference numeral 23, and the slit is omitted in other drawings.

  The inner shell 20 is slightly curved upwardly concavely when viewed from the front, and the front portion wraps downward. On the other hand, the right and left side portions of the outer cover 17 rise while being gently curved outwardly convex, and thus have a shallow dish shape (scoop shape) that is concave upward in a front view. The peripheral edge of the inner shell 20 and the peripheral edge of the outer cover 17 are in contact with each other. By making the depth of the outer cover 17 larger than the bending depth of the inner shell 20, the inner shell 20 and the outer cover 17 There is a large space between them, and the core member 22 is disposed in this space.

  As shown in FIGS. 6 and 7, the core member 22 includes a longitudinally long side member 22a, a substantially acting laterally long front member 22b, and a laterally elongated intermediate member 22d connected between the rear member 22c and the left and right side members 22a. It is almost a letter. The intermediate member 22d corresponds to the receiving portion described in claim 2. In addition, it is also possible to form in a planar view gate shape without providing the rear member 22c.

  The left and right side members 22a of the core member 22 extend in parallel to each other. The side member 22 a and the rear member 22 c are very close to the outer periphery of the outer cover 17, but there is a slight gap between the front member 22 b and the front end of the outer cover 17. The reason why there is a slight gap between the front member 22b and the front end of the outer cover 17 is that a large load is not applied to the front portion of the seat 3.

  For example, as can be understood from FIG. 8, the side member 22a and the front member 22b constituting the core member 22 are configured by bending an oval metal pipe into a U shape, while the rear member 22c is a metal bar. (Or a wire), and the left and right ends of the rear member 22c are inserted into the rear ends of the side members 22a and welded together. Of course, the front member 22b, the side member 22a, and the rear member 22c can be configured by a single pipe.

  The intermediate member 22d is made of a round pipe, and both left and right ends are welded to the inner surface of the side member 22a. The intermediate member 22d is disposed in a portion of the seat 3 that is slightly behind the front-rear center. In other words, the intermediate member 22d is disposed at a place where the seated person's buttocks hit (the place where the greatest load acts).

  The side member 22a and the rear member 22c of the core member 22 are located near the upper end of the outer cover 17, while the front member 22b is lowered below the front end of the side member 22a. 20 front parts are supported. Therefore, the inner shell 20 does not sink and deform at the position of the front member 22b.

  As shown in FIG. 11A, the rear portion of the side member 22a of the core member 22 is connected to the lateral support shaft 16 provided on the back frame 2 by a bolt 24 (therefore, the lateral support shaft 16 has a female screw hole. It is vacant, and a bolt insertion hole is vacant in the side member 22a of the core member 22.) Accordingly, the seat 3 rotates around the axis of the lateral support shaft 16. A resin washer 25 is fitted between the lateral support shaft 16 of the bolt 24 and the side member 22a. This is to prevent the generation of metal sound when the seat 3 is rotated.

  The outer cover 17 has a relief hole 26 for avoiding interference with the lateral support shaft 16. Further, an outward rib 17a that surrounds the lateral support shaft 16 from the lower side by a half circumference is integrally formed at the location of the escape hole 26 in the outer cover 17. Therefore, the exposed area of the lateral support shaft 16 is made as small as possible while the seat 3 is flipped up, which contributes to improving the aesthetics. Then, the outer cover 17 is shifted in the opposite direction and fitted into the other lateral support shaft 16).

  In this embodiment, a movable stopper 17b that is radially inward is provided at an appropriate portion of the outward rib 17a of the outer shell 13, while the movable stopper 17b hits the outer periphery of the lateral support shaft 16 when the seat 3 is fully raised. A fixed stopper 16a is provided. That is, the rib 17a is also used as a stopper means that regulates the flip-up turning posture of the seat 3. As the stopper means, the upper end surface of the rib 17a can be brought into contact with the fixed stopper 16a. Further, the fixed stopper 16a may be formed integrally with the lateral support shaft 16, or a screw may be used.

  A front rib 28 that comes into contact with the front member 22b of the core member 22 from the front is integrally formed on the front lower surface of the inner shell 20, and a front stopper 29 that comes into contact with the front member 22b from below is formed on the front rib 28. Provided integrally. The front ribs 28 are provided at the left and right intermediate portions and the two left and right portions (arrangement positions can be arbitrarily set).

  There is a slight gap between the front member 22b of the core member 22 and the outer cover 17, so that the front protrusions that receive the front member 22b are disposed on both sides of the outer cover 17 with the intermediate front rib 28 interposed therebetween. 30 are integrally provided on the left and right pairs. The front protrusion 30 is formed with an upward stopper portion 30a that holds the outer cover 17 so as not to move forward.

  As shown in FIGS. 9 and 10, at the rear of the inner shell 20, an L-shaped rear rib 31 that fits from the front to the rear member 22 c of the core member 22 and holds the inner shell 20 immovably upward, A rear stopper 32 that restricts the forward movement of the shell 20 is integrally formed. The rear stoppers 32 are formed at the left and right intermediate portions, and the rear ribs 31 are formed on both the left and right sides of the rear stopper 32.

  As shown in FIG. 8, on the left and right side portions of the inner shell 20, as an example of fixing means for fixing the left and right end portions of the inner shell 20, downward side ribs 33 that overlap the outer surface of the side member 22 a in the core member 22 are provided. A substantially horizontal outward-facing side rib 34 is integrally formed near the upper end of the downward-facing side rib 33. On the other hand, the outer cover 17 is integrally formed with inward side ribs 35 that overlap the outward side ribs 34 of the inner shell 20 from above. The outward side ribs 34 and the inward side ribs 35 constitute an example of engaging means for holding the inner shell 20 and the outer cover 17 so as not to move up and down.

  Since the inner shell 20 is provided with the downward side ribs 33, the left and right side edges of the inner shell 20 are held so as not to move inward, and thus the inner shell 20 is allowed to sink and deform by being seated. ing. Further, since the inward side ribs 35 of the outer cover 17 overlap the outward side ribs 34 of the inner shell 20 from above, the left and right side edges of the outer cover 17 are prevented from moving downward, and the outer cover 17 The side edge of the inner shell 20 is exactly overlapped with the side edge of the inner shell 20.

  As can be understood from FIGS. 6, 7, and 9, the set of the downward side rib 33, the outward side rib 34, and the inward side rib 31 is provided in two places in the front and rear, but it is also possible to provide only one place or three or more places. Yes (in the case of one place, the front and back length should be lengthened).

  As shown in FIG. 8, the intermediate member 22 d is bent upwardly in a concave shape so as to overlap the lower surface of the outer cover 17. Accordingly, there is a gap between the intermediate member 22d and the inner shell 20, and the inner shell 20 is allowed to sink. A group of support ribs 36 that support the horizontal portion of the intermediate member 22d is formed on the outer cover 17 at an appropriate distance from side to side, and the outer cover 17 is viewed from below at the positions of the support ribs 32 at the left and right ends. It is fixed with screws 37 screwed into the intermediate member 22d.

  The outer cover 17 and the core member 22 are integrated by screws 37, the inner shell 20 is held immovably upward by the outward side ribs 34 and the front stopper 29, and the rear stopper 32 is the core member. The inner shell 20 is held so as not to move forward by being in contact with the rear member 22c of 22 from the rear. When the rear portion of the inner shell 20 is raised to disengage the rear stopper 32 from the rear member 22c, the inner shell 20 can be pulled out and removed.

  As shown in FIG. 9, a portion of the outer cover 17 below the support rib 36 is formed with a downwardly concave and left and right horizontally extending arc groove 38, and the support body 18 provided on the back frame 2 is formed in the arc groove 38. It comes to fit.

(3) Summary As described above, in the present embodiment, since the lower surface of the seat 3 is constituted by the outer cover 17, only the seat 3 basically touches the human eye when it is flipped up. The internal structure of this is excellent in aesthetics because it is invisible to the human eye. Further, since the core member 22 is provided and the core member 22 is supported by the stopper 28 via the outer cover 17, high support strength is ensured.

  When the seat 3 is assembled, the outer cover 17 is fixed to the core member 22 with the screw 37 in advance, and then the lateral support shaft 16 is first inserted into the hole 26 by shifting the outer cover 17 with the core member 22 from above. Next, the bolt 24 is screwed into the lateral support shaft 16 from the inside.

  Next, the inner shell 20 is slid from the front to the back so that the outward side ribs 34 are fitted under the inward side ribs 35. When the inner shell 20 is pushed in, the rear stopper 32 of the inner shell 20 is moved. Due to the deformation against the elasticity, the core member 22 is positioned behind the rear member 22c, whereby the inner shell 20 is held so as not to be displaced in the front-rear and left-right directions. The removal procedure is as described above.

  When the inner shell 20 is attached, the internal members such as the core member 22 and the bolts 24 cannot be seen at all from the outside. Therefore, even when the inner shell 20 is flipped up, it has a clean appearance and looks good.

  In the present embodiment, there is a gap between the leg 1 and the seat 3, and the legs 7, 8 constituting the leg 1 are inclined in front view and side view, so the volume of the leg 1 is patented. Compared with Document 1, it is much smaller, so that it is possible to remarkably suppress a person from feeling pressure or cramp. Moreover, since the large space 6 is vacant between the left and right side portions of the seat 3 and the leg 1, it is possible to remarkably suppress the phenomenon that the moss is caught on the legs 7 and 8 when a person passes by the side of the chair.

  Further, the back frame 2 and the rear foot 8 are in the shape of a dogleg when viewed from the side, so that there is a large space between the seat 3 and the rear foot 8, so that the rows and rows of chairs It is possible to remarkably prevent the moss from hitting or catching on the hind legs 8 when a person passes between them. Further, since the back frame 2 is tilted backward and the rear foot 8 is tilted forward, a large rearward space is vacant on the rear surface of the seat 3, so that when a person walks along the passage behind the chair Can be prevented from being caught on the rear legs, and when the chairs are arranged in multiple rows, there are advantages that it is easy for a person sitting on the chairs in the second row and later to assemble their feet.

  If the seat 3 rotates around its rear end, a large moment acts on the seat 3 in a state where a person is seated. In this embodiment, the rear portion of the seat 3 is behind the side column 2a in the back frame 2. Since the seat 3 is connected to the side strut 2a in a portion before the rear end, the moment acting on the seat 3 is shorter than that of Patent Document 1. Therefore, a high support strength can be ensured while the chair is designed with consideration for others by opening a backward space behind the seat 3. The portion where the human body pressure is most intense is supported by the support body 18 from below, which contributes to securing the strength.

  When the groove 38 into which the support body 18 is fitted is formed on the lower surface of the outer cover 17 as in the present embodiment, even if the support body 18 is circular, the support body 18 and the outer cover 17 are in surface contact with each other. There is an advantage that can be prevented or remarkably suppressed, and there is an advantage that even if an indentation is formed, it is not noticeable. It is also possible to attach a soft material such as an elastomer to the support body 18.

(4). Others The present invention can be embodied in various ways other than the above embodiment. For example, the form and material can be freely set such that the core member is a sheet metal product or a die-cast product. The form of the frame device is not limited to the embodiment, and a chair in which the legs are formed in an open U shape in a side view as in Patent Document 1, or a leg in an open U shape in a front view. It can also be applied to a chair formed into a shape. The present invention is suitable for a movable nesting chair, but can also be applied to a non-movable flip-up chair such as a theater chair or a stadium chair.

It is a perspective view of the chair concerning a 1st embodiment. (A) is a front view, (B) is a plan view, and (C) is a side view. It is a bottom view of a chair. It is a side view which shows a nesting state. It is a separation front view of a chair. It is a top view of the part centering on the seat. It is the top view which abbreviate | omitted the inner shell and the cushion. FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 6. (A) is a sectional view taken along line IX-IX in FIG. 6, and (B) is a sectional view taken along line IX-IX in FIG. 6 at the front portion of the seat. It is a vertical side view of the rear part of a seat. It is XI-XI sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Leg which comprises frame apparatus 2 Back frame which comprises frame apparatus 2a Side support | pillar 3 Seat 4 Backrest 16 Lateral support shaft 17 Seat outer cover 18 Support body 20 Inner shell 21 Cushion 22 Core member 24 Connection bolt 26 Outer cover Escape hole

Claims (4)

A chair having a seat, a backrest, and a frame device to which they are attached, and being connected to the frame device so that the seat can be swung up and rotated around its rear part;
The seat has a resin inner shell that can sink and deform downward by a person sitting, a cushion stretched on the upper surface of the inner shell, and an outer cover that covers the inner shell from below.
Chair. Between the inner shell of the seat and the resin outer cover, a metal core member is disposed as a strength member that supports the load applied to the inner shell, and this core member can be rotated to the frame device. The frame device is provided with a support body that supports the seat from below on the front side of the center of rotation of the frame device. Are overlapped vertically via the outer cover, and there is a space between the receiving portion of the core member and the inner shell of the seat allowing downward deformation of the inner shell.
The chair according to claim 1. The frame device has a leg disposed with a space between the seat and a back frame that stands up from the leg and extends substantially upward through the left and right outer sides of the seat. The legs are in a non-target form so that the chairs arranged in the front and back can be fitted to each other, and further, the left and right horizontally long support bodies are arranged on the inner side of the left and right edges of the seat on the back frame or legs. Provided to hit the outer cover,
The chair according to claim 2. On the side struts located on both sides of the back frame on the back frame, side support shafts for connecting the core members of the seat are provided so as to face each other,
The outer cover of the seat has an upward concave shape so as to cover the core member from below, and the left and right side portions have curved cross-sectional shapes, and when the outer cover can be moved downward on the left and right side portions of the outer cover, There is an escape hole into which the lateral support shaft enters, and the core member is connected to the lateral support shaft by a bolt inserted from the inside of the outer cover.
The chair according to claim 3.

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