JP2013063178A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the manufacturing cost and to prevent wrinkles of a skin material from being generated in a back and seat integration type chair.SOLUTION: A back shell plate is separately configured into a lower back shell plate 9 and an upper back shell plate 10. A seat shell plate 8 and the lower back shell plate 9 are integrally molded, and the upper end of the lower back shell plate 9 is connected with the upper back shell plate 9. Cushions are insert-molded in the shell plates 8, 9 and 10. As the back shell plates are manufactured separately up and down, up-sizing of the shell plates can be avoided and the manufacturing cost can be suppressed. The upper faces of the lower back shell plate 9 and the lower cushion 11 are upward dented, and the lower faces of the upper back shell plate 10 and the upper cushion 12 have downward projecting parts. As the right and left both side parts of the lower cushion 11 are made to project, even when the skin material 13 is pulled backward by a seat material 89 for pulling, influence of the deformation accompanied by the tension to the lower cushion 11 is suppressed, and the wrinkles and recessed parts can be prevented from being generated on the skin material 13.

Description

  The present invention relates to a chair in which a backrest and a seat are continuously integrated.

  There are two types of chairs in which the backrest and the seat are integrated, in which the seat shell plate and the back shell plate are integrally connected and exposed as a whole, and the seat shell plate and the back shell plate are cushioned. As a type in which a cushion is stretched on a seat shell plate and a back shell plate, there are Patent Documents 1 and 2, for example. In a structure in which the seat cushion and the back cushion are continuously integrated, the position of the connecting portion between the seat portion and the back portion of the skin material is also pulled back, and an example thereof is described in Patent Document 3. Yes.

Japanese Patent No. 2592108 JP 2002-2448029 A Utility Model Registration No. 3031082

  The resin shell plate is generally manufactured by an injection molding method using a molding machine. However, if the entire seat shell plate and the entire back shell plate are integrally connected, the injection molding method is used. Since the projected area becomes very large in manufacturing, it cannot be manufactured without using a large molding machine with a large mold clamping capability, and this is an expensive facility, which not only increases the manufacturing cost but also takes time to prepare. There are also many cases where it is impossible to manufacture in a timely manner due to clogging reservations for molding machines.

  In addition, chairs with different backrest heights, such as low back, middle back, and high back, may be available. However, in the method of integrally molding the entire shell plate, each type of chair is made of gold. Since a mold must be prepared, there is a problem that the cost of the entire product group increases.

  The present invention has been made to improve the current situation.

  The chair according to the present invention has a seat and a backrest that have an integrally connected appearance, and the seat has a structure in which a cushion is formed on a resin seat shell plate, and the backrest is a resin back shell plate. The seat cushion and the backrest cushion are integrally covered with a continuous skin material.

  In the invention of claim 1, the shell plate of the backrest is composed of an upper back shell plate and a lower back shell plate manufactured separately and connected to each other, The upper surface of the seat shell plate is covered with a lower cushion extending in series, and the front surface of the upper back shell plate is covered with an upper cushion.

  Note that the terms “upper” and “lower” regarding the back shell plate are used to distinguish the shell plates that are separated from each other, and are not related to the height dimensions of the two. That is, the vertical height dimension of the upper back shell plate may be larger than the height dimension of the lower back shell plate. Conversely, the vertical height dimension of the upper back shell plate is smaller than the height size of the lower back shell plate. Alternatively, the vertical height dimensions of the upper and lower back shell plates may be the same.

  The present invention can be developed in many ways. Examples thereof are shown in claims 2 and below. Of these, the invention according to claim 2 is the slit according to claim 1, wherein the slit between the rear end of the seat shell plate and the lower end of the lower back shell plate is horizontally long and has both left and right ends extending forward. The outer portions of the left and right ends of the slit are bendable hinge portions, and the lower cushion passes through the slit and is behind the seat shell plate and the lower back shell plate. It has spread.

  According to a third aspect of the present invention, in the first or second aspect, the upper surface of the lower back shell plate and the lower cushion has a concave shape in which the left and right central portions are low and the left and right side portions are high when viewed from the front. The lower surface of the back shell plate and the upper cushion has a downward convex shape in which the left and right central portions are low and the left and right side portions are high in front view, and the lower back shell plate and the lower cushion, the upper back shell plate and the upper cushion, The concavities and convexities of each other fit into each other.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the skin material has a flat sheet portion constituting the seat and a bag-shaped portion covering the shell plate and the back cushion from above. Both are integrally connected, and a narrow tape-like edge member is fixed to the front edge and the left and right side edges of the flat sheet portion and the lower edge of the bag-like portion, and the edge member is attached to the seat shell. Locks to the bottom of the plate.

  In the present invention, since the back shell plate and the back cushion are composed of parts manufactured separately from each other, the projected area of each part is smaller than that of the conventional case when molding the shell plate as a whole. Become much smaller. Therefore, it can be manufactured using a widely used molding machine. As a result, the cost can be suppressed, and it becomes easy to manufacture in a timely manner and eliminate missing parts. In addition, when assembling items with different backrest heights, it is sufficient to prepare a plurality of types of the upper back shell plate and the upper cushion. Therefore, the cost can be suppressed as a whole in manufacturing a plurality of types of chairs.

  Furthermore, since the seat shell plate and the back shell plate are not separately configured, but the back shell plate is manufactured separately for the upper part and the lower part, the integrity of the seat and the backrest is ensured. In addition, when the backrest is tilted backwards with a locking function, if the seat cushion and the back cushion are separate members, a step may occur on the boundary surface between the seat cushion and the back cushion during use. However, in the present invention, since the lower part of the back cushion is integrally connected to the seat cushion, a step is generated at the boundary between the seat and the backrest during use, and the aesthetic appearance is not impaired. Therefore, it is excellent also in quality.

  Now, as in Patent Document 1, when the back seat integrated type chair is provided with a locking function, if the seat is tilted backward only by the backrest without changing the side view posture, the user can stabilize the lower body and the upper body. For example, there is an advantage that it is possible to operate the personal computer while leaning on the backrest. However, if the seat shell plate and the back shell plate are continuous in series as in Patent Document 1, locking is permitted using elastic deformation of the shell plate, so that there is a possibility that it is difficult to lock without difficulty. is there.

  On the other hand, if the configuration of claim 2 of the present application is adopted, the lower backrest can move down greatly with respect to the rear end of the seat portion by deformation of the hinge portion, so that the backrest can be locked without changing the side view posture of the seat portion. It can be done without difficulty. That is, the backward tilt angle of the backrest can be made as large as possible without causing a problem of stress concentration on a specific portion of the shell plate.

  Further, when the cushion is insert-molded into the shell plate as in claim 2, the cushion is positioned on the front and back of the shell plate through the slit, so that even if the lower end of the backrest moves up and down relative to the rear end of the seat, Since shape retention is ensured without any deviation, there is an advantage that it is possible to prevent a problem that the cushion is recessed during use.

  The upper surface of the lower shell plate and the lower surface of the upper shell plate can be formed in a straight line when viewed from the front. Since it can connect in the position which changed the thickness, connection strength can be improved. In addition, when the skin material is drawn to the back side at the joint between the seat and the backrest, wrinkles of the skin material can be prevented or suppressed. This point will be described in detail in the section of the embodiment.

  Although it is described in Patent Document 3 that the portion constituting the backrest of the skin material is made into a bag shape, if a string or a wire is used as a fixing means for the skin material, for example, the attachment work is troublesome and the skin material There is a risk that it will be difficult to stabilize the tension against the. In this respect, when the tape-like edge member is used as in the fourth aspect, the skin material can be attached very easily and the tension on the skin material can be made constant to stabilize the quality.

It is a figure which shows the external appearance of the chair which concerns on embodiment, (A) is a front view, (B) is a side view, (C) is a top view, (D) is a rear view, (E) is a partial perspective view. is there. (A) is the whole isolation | separation perspective view, (B) is the isolation | separation perspective view in the state which turned over the base. It is a figure of the support mechanism part centering on the base, (A) is a partially-omission perspective view, (B) is a separate perspective view of a cushion. It is side sectional drawing of the part centering on the seat. It is sectional drawing which mainly shows the arrangement | positioning relationship of a cushion. It is a vertical side view (the seat is cut at a rail member). (A) is a sectional view taken along the line VIIA-VIIA in FIG. 6, 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. 6. It is the isolation | separation perspective view which looked back at the shell board. (A) is a separated front view of the back shell plate, (B) is a sectional view taken along the line BB of (A) in the connected state, (C) is a sectional view taken along the line CC of (A) in the connected state, (D) is DD sectional view taken on the line (A) in the connected state. (A) is sectional drawing of the fastening part of an upper back shell board, a reinforcement board, and a back support | pillar, (B) is sectional drawing of the upper back shell board in the location of (A). (A) is a separated front view showing the relationship between the shell plate and the cushion, (B) is a longitudinal front view centering on the lower end portion of the lower back shell plate, and (C) is a longitudinal cross section showing the locking state of the edge member. FIG. (A) is the isolation | separation perspective view in the state which turned over the seat shell board, (B) is an expanded view of a skin material.

  Next, an embodiment of the present invention will be described with reference to the drawings. In the following description, the words “front and back” and “left and right” are used to specify the direction, but this wording is based on the direction of a normal seated person. However, the front view refers to the direction facing the seated person. The words “inside” and “outside” are also used, but the direction facing the center of the chair in front view is inward, and the direction from the center of the chair toward the left and right outside in front view is outward.

(1). Outline of Chair First, the outline of the chair will be described with reference to FIGS. The present embodiment is applied to a swivel chair. As shown in FIG. 1, the chair includes a body receiving portion 3 in which a seat 1 and a backrest 2 are integrally continuous, a leg device 5 having a leg column 4, and a leg. It has a base 6 attached to the upper end of the support column 4 and a back frame 7 connected to the base 6 so as to be able to tilt backward. The leg device 5 has branch legs extending in the radial direction, and a caster is provided at the tip of each branch leg. The base 6 and the back frame 7 are an aluminum die cast product or a resin molded product.

  As can be understood from FIGS. 2 and 3, the body receiving portion 3 has a shell plate and a cushion formed integrally therewith. The shell plate includes a seat shell plate 8 constituting the seat 1, a lower back shell plate 9 integrally connected to the rear portion of the seat shell plate 8, and an upper back shell plate 10 that is separate from the lower back shell plate 9. And the lower end portion of the upper back shell plate 10 is connected to the upper end portion of the lower back shell plate 9. Therefore, the shell plate of the backrest 2 is constituted by the upper and lower back shell plates 9 and 10. The shell plates 8, 9, and 10 are resin molded products, and a plurality of ribs extending in the vertical and horizontal directions are formed on the back surface thereof. In the present embodiment, the upper back shell plate 10 constitutes most of the backrest 2 (about 70 to 80%).

  As shown in FIG. 3 (B), the cushion is divided into a lower cushion 11 corresponding to the seat shell plate 8 and the lower back shell plate 9, and an upper cushion 12 corresponding to the upper back shell plate 10. These cushions 11 and 12 are insert-molded on the shell plates 8, 9 and 10, respectively. As can be understood from FIG. 5, the lower cushion 11 covers the entire surface of the seat shell plate 8 and the lower back shell plate 9 and winds up to the back side of the end edges of the seat shell plate 8 and the lower back shell plate 9. Molded. On the other hand, the upper cushion 12 is formed so as to wrap the entire front and rear surfaces of the upper back shell plate 10.

  The body receiving part 3 has a skin material 13 having a monolithic structure, and a portion of the skin material 13 located on the backrest 2 is formed in a bag shape that covers the backrest 2 from above. The part corresponding to the seat 1 is wound downward from the outer periphery of the seat 1.

  The seat shell plate 8 and the lower back shell plate 9 are divided by slits 15 except for the hinge portions 14 at both left and right ends. In other words, the seat shell plate 8 and the lower back shell plate 9 are integrally connected only by the hinge portions 14 at both left and right ends. For this reason, the lower back shell plate 9 (backrest 2) can tilt backward relative to the seat shell plate 8 (relative to the seat 1) due to the deformation of the hinge portion 14. The slit 15 is formed in a U shape in plan view with its left and right ends extending forward, and therefore the hinge portion 14 is located in front of the rear end of the seat shell plate 8.

  As shown in FIGS. 2 and 4, the base 6 has a generally rectangular shape in plan view and has a frame structure opened up and down. For this reason, the base 6 has a rear member 6a, left and right side members 6b, and a front member 6c. A leg strut mounting hole 17 is formed in the left and right middle portion of the rear member 6a, and a rearward projecting portion 18 is formed at the rear end of the rear member 6a. The back frame 7 is made of a horizontally long pipe on the rearward projecting portion 18. The support shaft 19 is rotatably connected.

  As can be understood from FIG. 1 (B), spaces are vacant on both the left and right sides of the rearward projecting portion 18 between the rear surface of the base 6 and the lower front end of the back frame 7. Even when the back frame 7 is tilted by locking, the size is set to be larger than that of a general adult finger. Therefore, even if a person inserts a fingertip into the gap between the base 6 and the back frame 7, the person is not caught. In addition, as shown in FIG. 6, the rear member 6a of the base 6 is formed in a hollow shape opened upward, and a rib is formed inside thereof. A base cover 6d is mounted on the upper surface of the rear member 6a.

  As shown in FIGS. 2 and 4, a longitudinal rail member 20 is slidably attached to the left and right side members 6 b of the base 6, and a seat shell plate 8 is attached to the rail member 20. The rail member 20 moves backward against the spring 21 incorporated therein.

  For example, as shown in FIG. 2 (A), the back frame 7 has a laterally long base portion 22 constituting the lower end thereof, and a left and right intermediate portion of the base portion 22 is connected to the base 6 via a bearing bracket 23. The rearward projecting portion 18 is connected to the support shaft 19. Similarly, as can be understood from FIG. 2A, upward bearing ribs 25 located between the left and right bearing portions 24 provided at the rear end of the rail member 20 are provided at the left and right ends of the base portion 22 of the back frame 7. The bearing portion 24 of the rail member 20 and the bearing rib 25 of the back frame 7 are connected to each other by a horizontally long pin 26.

  Back struts 27 are formed integrally with the left and right ends of the base portion 22 of the back frame 7 so as to recede slightly rearward and then rise upward. A boss portion 28 projecting forward from the upper end of the back strut 27 The upper back shell plate 10 is fastened with screws (screws) 29.

  A left and right horizontally elongated recess 30 that opens forward is formed in the lower part of the front surface of the upper back shell plate 10, and a horizontally elongated reinforcing plate 31 made of metal (made of steel plate) is fitted into the recess 30. 29 is screwed into a burring portion 32 formed on the reinforcing plate 31. Therefore, the back column 27, the upper back shell plate 10, and the reinforcing plate 31 are fastened together with screws (screws) 29.

  At the upper end of the back column 27, an elbow body 33 having a shape that bends left and right outwards and extends forward is integrally formed. The elbow body 33 is provided with an elbow cover 34 that covers the entire upper surface of the elbow body 33. Yes. The elbow cover 34 is integrally formed with a downward rear wall 34 a that covers the upper part of the back column 27 from behind.

(2). Supporting mechanism part Next, the supporting mechanism part centering on the rail member 20 is demonstrated. As shown in FIGS. 7 and 8, the rail member 20 is made of sheet metal and has a channel-like (U-shaped) shape opened downward, and the seat shell plate 8 has a downward restriction that surrounds the rail member 20 from both the left and right sides. A pair of left and right ribs 41 are provided. As shown in FIG. 7B, the downward regulating rib 41 is integrally provided with positioning ribs 42 that are close to the rail member 20 from the inside and outside, and the longitudinally extending stopper piece 43 formed by cutting and raising the rail member 20. Further, the engaging claw 44 formed on the downward regulating rib 41 is applied from below. Accordingly, the seat shell plate 8 is held so as not to be separated upward with respect to the rail member 20, and the seat shell plate 8 and the rail member 20 can be relatively moved in the front-rear direction.

  As shown in FIG. 7, a horizontally long guide pin 45 is inserted in the front end portion of the rail member 20 so as not to move back and forth. The guide pin 45 is attached to a guide body 46 fixed to the side member 6 b of the base 6. The guide hole 47 is formed. The guide hole 47 is a long hole in the longitudinal direction, so that the rail member 20 can slide back and forth together with the seat shell plate 8. The side member 6b of the base 6 is integrally formed with a longitudinal bank 51 that guards the rail member 20 from the outside.

  For example, as shown in FIG. 6, a front spring receiver 50 is attached to the front and rear intermediate portions of the rail member 20, and the spring (compression coil spring) 21 already described is supported from the front side by the front spring receiver 50. Has been. The spring 21 is supported from behind by a rear spring receiver 61. The rear spring receiver 61 has a hollow shape opened downward, and is fitted from above onto a protrusion (not shown) formed on the side member 6 b of the base 6.

(3). Structure of the backrest Next, the structure of the backrest 2 will be described. For example, as shown in FIGS. 2 and 3, side ribs 68 projecting upward are formed on the left and right side edges of the lower back shell plate 9, and the hinge portion 14 is connected to the front end of the side rib 68. Due to the reinforcing effect of the side ribs 68, the lower back shell plate 9 has high rigidity. Since the hinge portion 14 is located in front of the rear end of the seat shell plate 8, the side rib 68 also extends forward from the rear end of the seat shell plate 8.

  For example, as shown in FIG. 9, a large number of reinforcing ribs 69 extending in the vertical and horizontal directions are formed on the back surfaces of the lower back shell plate 9 and the upper back shell plate 10, and windows are provided at many portions surrounded by the reinforcing ribs 69. The hole 70 is vacant. As described above, cushions 12 and 11 such as urethane foam are insert-molded on the upper and lower back shell plates 9 and 10 on both the front and back surfaces. Pass through the back of the back shell plates 9 and 10.

  Overlapping portion rib plates 71 and 72 are formed on the lower surface of the upper back shell plate 10 and the upper surface of the lower back shell plate 9, respectively. A mating protrusion 73, side engaging protrusions 74 positioned at both left and right ends, and an intermediate positioning protrusion 75 positioned between the center engaging protrusion 73 and the side engaging protrusion 74 are provided to protrude downward.

  On the other hand, on the upper part of the lower back shell plate 9, a center pocket portion 76 into which the center engaging projection 73 is fitted, a side pocket portion 77 into which the side engaging projection 74 is fitted, and an intermediate pocket portion into which the intermediate positioning projection 75 is fitted. 78 is opened upward. As shown in FIG. 10, the center engaging protrusion 73 is formed with an engaging claw 73a that protrudes obliquely upward, and this engages and engages with a center engaging hole 76a provided in the center pocket 76 from below. Yes.

  Similarly, the side engaging protrusion 74 is formed with an engaging claw 74 a that protrudes obliquely upward. The engaging claw 74 a is engaged with the side engaging hole 77 a provided in the side pocket portion 77 from below. doing. The center engaging projection 73 is in a posture that is tilted toward the rear side, and the side engaging projection 74 is in a posture that is tilted toward the near side.

  The overlap portion rib plate 72 of the lower back shell plate 9 has a shape in which a considerable range including the intermediate portion thereof is recessed downward in a front view, while the overlap portion rib plate 71 of the upper back shell plate 10 is A considerable range including the left and right intermediate portions protrudes downward. That is, the mating surfaces of the upper and lower back shell plates 9 and 10 are uneven as viewed from the front. And the inner side surface 72b of the recessed part 72a of the overlap part rib board 72 in the lower back shell board 9 inclines, and the intermediate | middle pocket part 78 has straddled the bottom surface 72c of the recessed part 72a, and the inclined inner side surface 71b. Is formed. On the other hand, the outer surface 72b of the convex portion 71a of the overlapping portion rib plate 71 in the upper back shell plate 10 is also inclined, and the intermediate positioning protrusion 75 straddles the lower surface 71c of the convex portion 71a and the inclined outer surface 71b. It is formed in a state.

  For example, as shown in FIG. 11A, the lower portion of the lower back shell plate 9 is recessed in a forward-facing concave shape in plan view, and the reinforcing plate 31 disposed below the lower back shell plate 9 is also forward-facing in plan view. It is bent in a concave shape. That is, a considerable range including the middle portion of the reinforcing plate 31 is a base portion extending in a laterally long straight line in plan view, but a certain range near both the left and right ends includes an inclined portion 31a bent toward the front side. Further, a laterally long end portion 31b is formed at the tip of the inclined portion 31a in plan view. A burring portion 32 is projected forward from the end portion 31b, and a screw 29 is screwed into the female screw formed in the burring portion 32 from behind.

  As shown in FIGS. 9 to 11, the upper back shell plate 10 is formed with a receiving seat 79 into which the boss portion 28 of the back column 27 is fitted. Further, a counterbore 80 into which the head of the screw 29 enters is formed on the back surface of the back column 27 at the location of the boss portion 28. The counterbore 80 and the head of the screw 29 are covered with a rear wall 34 a of the elbow cover 34. For this reason, deterioration of aesthetics can be prevented.

  As shown in FIG. 2 (A), an upper hook-like lower engaging claw 81 is projected from the front surface of the back column 27 at a substantially middle height position in the vertical direction. On the other hand, as shown in FIG. 9, on the back surface of the lower back shell plate 9, a pocket-shaped lower receiving portion 82 having an upward opening that fits into the lower engaging claw 81 from above is formed. The lower receiving part 82 is exposed to the rear in a state of penetrating the skin material 13.

(4) Cushion / Skin Material Next, the cushions 11 and 12 and the skin material 13 will be supplementarily explained. As described above, the upper back shell plate 10 and the lower back shell plate 9 are meshed with unevenness, but the upper and lower cushions 11 and 12 are also uneven because they are aligned with the shape of the upper and lower shell plates 9 and 10. Are engaged. Further, as described above, the seat shell plate 8 and the lower back shell plate 9 are integrally covered with the lower cushion 11. That is, the lower cushion 11 spreads forward and backward while straddling the slit 15.

  A rough developed view of the skin material 13 is shown in FIG. In the skin material 13, a flat sheet portion 13 a constituting the seat 1 portion and a bag-like portion 13 b constituting the backrest 2 portion are integrally continuous. An elongated edge member 86 made of a resin sheet is fixed to the front end edge, the left and right end edges of the flat sheet portion 13a, and the lower end edge of the bag-like portion 13b by sewing or the like. While the edge member 86 jumps and has a plurality of holes 87, a hook-like engagement claw 88 into which the hole 87 of the edge member 86 enters is protruded on the lower surface of the seat shell plate 8.

  The skin material 13 is also a back seat integrated system, and the portion constituting the seat 1 and the portion constituting the backrest 2 are bent in a side view, so that loosening is likely to occur. Therefore, the retractable sheet material 89 is fixed to the portion of the skin material 13 located at the connecting portion between the seat 1 and the backrest 2 and the portion located above the backrest 2 by sewing or the like, and this is fixed to the lower back. It is attached to the shell plate 9. Accordingly, the cushions 11 and 12 are notched at the location where the retractable sheet material 89 is provided.

  As shown in FIGS. 12C and 12D, the upper back shell plate 10 is formed with a horizontally long groove 90 (see also FIG. 2A) into which the retractable sheet material 89 is inserted from the surface side. In addition, an engaging claw 92 that fits into a hole 91 provided in the pull-in sheet material 89 is provided in the horizontally long groove 90.

  As shown in FIG. 11B, a ring-shaped resin plate 83 that fits in the receiving seat 79 is integrally provided on the skin material 13 by sewing or the like. For this reason, the skin material 13 is positioned accurately. Although the ring-shaped resin plate 83 is not shown in FIG. 11A, the ring-shaped resin plate 83 and the skin material 13 are actually interposed between the receiving seat 79 and the boss portion 28.

(5) Summary When the seated person leans against the backrest 2, the backrest 2 tilts backward about the support shaft 19 against the spring 21, and the seat 1 is pulled backward by the connecting pin 26 and moves backward. To do. In this case, since the slit 15 is formed between the rear end of the seat 1 and the front end of the lower back shell plate 9, the lower back shell plate 9 can move downward relative to the rear end of the seat shell plate 8. In this way, the backrest 2 can be locked without any trouble. In particular, since the hinge portion 14 is located in front of the rear end of the seat shell plate 8, the back tilting of the backrest 2 can be performed without difficulty.

  The cushion can be separated between the seat shell plate 8 and the lower back shell plate 9, but in this case, the thickness is increased at the boundary between the upper and lower shell plates 11 and 12 while the chair is being used. There is a risk that a direction shift (step) will occur and the appearance will deteriorate. On the other hand, in the present embodiment, the lower cushion 11 is formed so as to straddle the seat shell plate 8 and the lower back shell plate 9, so that the boundary between the seat 1 and the backrest 2 is maintained even if it is continuously used. There is no step in the part and the quality is excellent.

  Since the cushions 11 and 12 are insert-molded into the shell plates 8, 9 and 10, the reinforcing plate 31 is mounted on the upper back shell plate 10 in advance. In this case, the reinforcing plate 31 is accurately positioned by fitting the protrusions provided on the upper back shell plate 10 and the holes provided in the reinforcing plate 31. Further, as described with reference to FIG. 11 (B), the skin material 13 is integrally provided with a ring-shaped resin plate 83 that fits into the receiving seat 79 of the upper back shell plate 10. The rear is accurately positioned on the upper back shell plate 10. When the upper back shell plate 10 and the lower back shell plate 9 are overlapped with unevenness, the upper and lower back shell plates 10 and 9 are connected at a position where the height is changed, so that there is an advantage that the connection strength can be improved.

  Now, as indicated by an arrow A in FIG. 12A, tension is also applied to the lower cushion 11 by pulling by the pulling sheet material 89. In this case, as shown by a one-dot chain line 94 in FIG. 12A, when the boundary surfaces of the upper and lower cushions 11 and 12 are formed in a straight line, the left and right end portions of the lower cushion 11 are pulled by the pulling of the retractable sheet material 89. Occurs in a downward direction, and a gap is left between the skin material 13 and the skin material 13 may be wrinkled or dented.

  In this respect, when the left and right side portions of the lower cushion are protruded upward as in the embodiment, even if a pulling force acts on the left and right side portions 11a of the lower cushion 11 due to the pulling of the pull-in sheet material 89, Since the side portion is less likely to be deformed, the visible deformation does not occur and the appearance is good. In addition, since the skin material 13 is strongly pulled in the surrounding area of the pulling sheet material 89, the wrinkles are more likely to occur. However, the generation of the wrinkles can be eliminated by applying urethane tape to the surrounding area of the pulling sheet material 89. (The deformation of the skin material 13 can be suppressed by making it difficult to deform.).

  The product of the present invention can be actually manufactured. Therefore, it can be used industrially.

DESCRIPTION OF SYMBOLS 1 Seat 2 Backrest 3 Body receiving part 6 Base 7 Back frame 8 Seat shell board 9 Lower back shell board 10 Upper back shell board 11 Lower cushion 12 Upper cushion 13 Skin material 14 Hinge part 15 Slit

Claims (4)

It has a seat and a backrest that have an external appearance connected together, and the seat has a structure in which a cushion is stretched on a resin seat shell plate, and the backrest has a structure in which a cushion is stretched on a resin back shell plate. The seat cushion and the back cushion are a chair covered with a continuous skin material,
The shell plate of the backrest is composed of an upper back shell plate and a lower back shell plate manufactured separately and connected to each other, and the front surface of the lower back shell plate and the upper surface of the seat shell plate are a series. Covered with a lower cushion, the front of the upper back shell plate is covered with an upper cushion,
Chair. Between the rear end of the seat shell plate and the lower end of the lower back shell plate, slits are formed that are horizontally long and have both left and right ends extending forward, and outer portions at the left and right ends of the slit. Is a bendable hinge portion, and the lower cushion is insert-molded, and spreads behind the seat shell plate and the lower back shell plate in a state of passing through the slit.
The chair according to claim 1. The upper surfaces of the lower back shell plate and the lower cushion have a concave shape in which the left and right central portions are low and the left and right side portions are high in the front view, while the lower surfaces of the upper back shell plate and the upper cushion are left and right in the front view. The lower part of the lower shell plate and the lower cushion and the upper shell plate and the upper cushion are fitted to each other.
The chair according to claim 1 or 2. The skin material has a flat sheet portion that constitutes the seat and a bag-shaped portion that covers the shell plate and the back cushion from above, and both are integrally connected to each other. A narrow tape-like edge member is fixed to the side edge and the lower edge of the bag-like portion, and the edge member is locked to the lower surface of the seat shell plate.
The chair as described in any one of Claims 1-3.

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