JP7032080B2 - Manufacturing method of skin material for body support of chair - Google Patents

Description

The present invention relates to a body support that receives human body pressure in a chair, such as a backrest or a seat, or an optional headrest, shoulder rest, or elbow rest. The body support can also be called a body pressure receiving member.

In a chair, when the backrest and the seat have a cushioning material, the cushioning material is covered with a skin material such as cloth. In such a configuration, it has been proposed to form the skin material in a bag shape and cover the cushion material and the back plate with the skin material (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2002-347317

In the configuration where the back plate is covered with a bag-shaped skin material, wrinkles and distortion are likely to occur in the skin material at the part where the outer edge of the back plate is covered, especially at the place where the outer edge of the back plate is curved, and the appearance is spoiled. There was a problem. Such a defect becomes particularly remarkable when a skin material made of leather having low elasticity such as vinyl leather is used.

The invention of the present application has been made to improve such a situation.

The present invention is intended for chair body supports such as backrests, seats, headrests and shoulder rests. The invention of the present application has a multifaceted expanse, and a typical example thereof is specified in each claim.

The method for producing an epidermis material for a body support according to the present invention is a method for producing an epidermis material used for a backrest or other body support having a substrate and a bag-shaped epidermis material covering the substrate, and one of them is stretched. When the outer edges of the base material and the other upholstery material are sewn together and then turned inside out to form the bag-shaped skin material, one of the upholstery materials is stretched larger than the other upholstery material. After sewing the outer edge portions together in the sewn state, gathers are formed on the other upholstery material by eliminating the stretched state, and the one and the other upholstery material after sewing are formed. By turning it over, the bag-shaped skin material is formed.

In the present invention, the gather may be formed corresponding to a position where the edge of the substrate covers a curved portion.

Further, in the present invention, there may be an example in which the one upholstery material has higher elasticity than the other upholstery material.

Further, in the present invention, the size of the one upholstery material and the other upholstery material are different, and the outer edge portion is stretched so as not to stretch the larger upholstery material but to stretch the smaller upholstery material. An example of sewing each other can be given.

Further, in the present invention, an example may be mentioned in which the other upholstery material is made of leather. Here, the leather includes natural leather, synthetic leather such as vinyl leather, artificial leather and the like. However, in the present invention, the material of the upholstery material is not limited to leather, and may be cloth such as woven fabric, knitted fabric, and non-woven fabric.

In the method for producing the skin material for a body support of the present invention, the outer edges are sewn together in a state where one upholstery material is stretched larger than the other upholstery material, and then the stretched state. By eliminating the above, gathers can be easily formed on the other upholstery material. Then, by turning over one and the other upholstery material after sewing, a three-dimensional bag-shaped skin material having a bulge on the other upholstery material can be formed at the gather formation position. As a result, it is possible to suppress the occurrence of wrinkles and distortion at the portion where the bag-shaped skin material covers the outer edge portion of the substrate, and it is possible to improve the aesthetic appearance of the body support of the chair.

In the present invention, if the gathers are formed corresponding to the positions where the edges of the substrate cover the curved portions, wrinkles and distortions of the skin material at the curved portions of the substrate are formed. Can be suppressed.

Further, in the present invention, the size of the one upholstery material and the other upholstery material are different, so that the larger upholstery material is not stretched and the smaller upholstery material is stretched. If they are sewn together, the outer edges of one upholstery material and the other upholstery material can be matched with each other in the sewn skin material. As a result, the area of the outer edge of the upholstery material existing inside the bag-shaped part of the skin material can be minimized, and the outer edge of the upholstery material inside the bag-shaped part interferes when the skin material is attached to the substrate. Can be prevented from becoming.

Further, in the present invention, if one of the upholstery materials has higher elasticity than the other upholstery material, the one upholstery material can be easily stretched to form gathers. The sewing work becomes easy.

Further, according to the present invention, even when leather is used as the other upholstery material, wrinkles and distortion can be suppressed at the portion where the leather as the skin material covers the outer edge of the substrate, and the body support of the chair can be suppressed. Can improve the aesthetics of.

It is a perspective view of the chair made into a mesh type seen from the front, (A) shows the flexible sheet, and (B) shows the flexible sheet omitted. It is a perspective view which looked at the chair which concerns on embodiment from the rear, (A) is the thing which displayed the flexible sheet, (B) is the thing which omitted the flexible sheet. It is a separation perspective view of a back frame and a seat holding frame. It is a separation perspective view of a back frame and a seat holding frame. (A) is a separate perspective view of the back support and the back frame, and (B) is a perspective view showing the procedure for attaching the seat holding frame. It is a separation perspective view of a back frame and a seat holding frame. (A) is a sectional view taken along the line AA of FIG. 1 (B), (B) is a partially enlarged view of FIG. 1 (A), and (C) is a sectional view taken along the line CC of FIG. 1 (B). It is a vertical sectional side view of the central part of the back part. It is a figure which shows the state which made it a cushion type, (A) is the perspective view which shows most of the appearance, (B) is the perspective view in the state which omitted the cushion, (C) is the separation perspective view. It is a perspective view of the backrest seen from the back, (A) shows the back frame, and (B) shows the back frame omitted. It is a separation perspective view of a back plate and a back frame. (A) is a vertical sectional side view of the central portion showing the relationship between the back plate and the upper shell, and (B) is a separated perspective view of the back plate and the upper shell. FIG. 12 (B) is a plan sectional view taken along the line of sight of XIII-XIII in FIG. 12 (B). (A) is a vertical sectional side view of the upper part of the central portion, and (B) is a vertical sectional side view of the lower part of the central portion. It is a figure of the backrest of the embodiment which has the skin material made of leather, (A) is the vertical sectional side view, (B) is the partial enlarged view around the retracted part. It is an exploded perspective view of a back plate and a cushion material. FIG. 15 is a front sectional view taken along the line of view of XVII-XVII in FIG. (A) is a front view and a back view of the skin material, (B) is a DD visual cross-sectional view of (A), and (C) is an EE visual cross-sectional view of (A). It is a figure for demonstrating the manufacturing process example of the skin material. It is a schematic cross-sectional view corresponding to each process of FIG.

Next, an embodiment of the present invention will be described with reference to the drawings. In this application, the words left, right, front and back are used to specify the direction, but this is based on the person who normally sits on a chair. The front view is the direction facing the seated person. As a precaution, the direction is clearly shown in FIG.

This embodiment is applied to a swivel chair that is frequently used in offices. Further, the chair of the present embodiment is a type in which the front part of the backrest advances when a person sits down. In this embodiment, the present invention is applied to the backrest. 1 to 8 show a state in which the backrest is a mesh type, and FIGS. 9 and 9 show a state in which the backrest is a cushion type.

(1). Outline of the chair First, the outline of the chair will be explained with reference to FIGS. 1 and 2. As shown in FIG. 1, the chair includes a leg device 1, a seat 2, and a backrest 3 as main elements. The leg 1 has a leg strut 4 made of a gas cylinder and a branch portion 5 extending in the radial direction, and a caster is provided at the tip of each branch portion 5. A substantially box-shaped base (not shown) that opens upward is fixed to the upper end of the leg support 4.

Although not shown, a resin or aluminum die-cast front block is bolted to the front end of the base, and a pair of left and right front links are rotatably attached to the front block. .. The front link is slightly tilted backward with respect to the vertical line when viewed from the side in a neutral state where no person is seated, and tilts backward when a person is seated.

Further, a tilting body (not shown) is connected to the base so as to be tilted backward by a left and right longitudinal support shaft, and a rear block 14 is fixed to the rear portion of the tilting body. The back support 16 is fixed to the rear portion of the rear block 14, and the upper end portion of the backrest 3 is attached to the upper end of the back support 16. The back column 16 has two vertical frames 26 on the left and right, and the upper ends of the vertical frames 26 on the left and right are integrally connected via a connecting portion 27.

As shown in FIG. 2, the lower end portion of the backrest 4 is connected to the upper end portion of the second interlocking link 36 that can be tilted back and forth. A pair of left and right rear links (not shown) are connected to the rear block 14 in a state parallel to the front link, and the seat 2 is connected to the front link and the rear link via the seat outer shell. When a person sits down, the seat front link and rear link are tilted backward to move the seat downward, and the second interlocking link is linked to the rotation of the rear link (not shown). 36 tilts forward.

Therefore, when a person sits down, the backrest 3 bends around the upper end thereof, so that the lower end portion advances. As a result, even if the person sits shallowly, the waist of the person is supported by the backrest 3. When a person sits deeply, the first interlocking link described above is deformed, so that the backrest 3 does not move and the seat 2 is allowed to move downward. Since the support structure of the seat 2, the advancing mechanism of the backrest 3, the locking mechanism, and the like are not directly related to the present invention, detailed description thereof will be omitted.

(2). Outline of mesh type backrest Next, the backrest 3 will be described with reference to FIGS. 3 and below. For example, as shown in FIG. 1, the backrest 3 has a back frame 41 opened in the front-rear direction, upper and lower seat holding frames 46 and 47 overlapping the front surface of the back frame 41, and a flexible sheet that receives the body pressure of the seated person. It has 48 and. The flexible sheet 48 is a mesh-like fabric such as a knitted fabric or a woven fabric, and a strong elastic yarn is woven (or woven) so as to exert a strong elastic force in the lateral direction. For example, as can be seen from FIG. 3, the abutting surfaces of the upper and lower sheet holding frames 46 and 47 are inclined with respect to the horizontal plane. To be precise, the abutting surface of both is inclined so that the left and right outer sides are low and the inner side is high in the front view.

As partially shown in FIG. 7, a band-shaped edge member 49 made of a resin tape or the like is fixed around the flexible sheet 48 by sewing or the like, and the edge member 49 is the sheet holding frame 46, It is mounted (locked) on the back surface of 47. Since the flexible sheet 48 is wound from the front to the back side of the sheet holding frames 46 and 47, the entire sheet holding frames 46 and 47 are hidden by the flexible sheet 48, but they can be seen through. ..

Further, the seat holding frames 46 and 47 are divided into an upper seat holding frame 46 and a lower seat holding frame 47, but the flexible sheet 48 is one. The ratio of the vertical heights of the upper seat holding frame 46 and the lower seat holding frame 47 can be arbitrarily set.

The back frame 41 is composed of left and right side frames 50 that are long in the vertical direction, an upper frame 51 that is connected to the upper ends of the left and right side frames 50, and a lower frame 42 that is connected between the lower ends of the left and right side frames 50. As a whole, it is almost a quadrangle when viewed from the front. On the other hand, the upper frame 51 is entirely located behind the side frame 50, and is folded back so as to face downward in the side view.

On the other hand, the upper seat holding frame 46 has a side member 52 that overlaps the side frame 50 of the back frame 41 from the front, and an upper shell 53 that is integrally connected to the upper ends of the left and right side frames 50. The upper shell 53 has a horizontally long rack portion 53a extending between the upper ends of the left and right side members 52, and a curl portion 53b bent backward and downward from the horizontally long mount portion 53a, and the curl portion 53b is a back frame 41. It is fixed to the upper frame 51. The upper shell 53 may be paraphrased as a shell-shaped upper member.

Most of the lower seat holding frame 47 is composed of a horizontal portion 47a that overlaps the lower frame 42 of the back frame 41, and overlaps the left and right ends of the horizontal portion 47a and the lower portion of the side frame 50 of the back frame 41. The upright portion 47b is integrally provided.

In the present embodiment, the upper frame 51 of the back frame 41 and the curl portion 53b of the upper seat holding frame 46 are integrally formed. Therefore, the upper frame 51 of the back frame 41 is also covered from behind by the curl portion 53b. As shown in FIG. 2, the curl portion 53b is entirely covered with the flexible sheet 48. Further, in front of the upper frame 51 and the curl portion 53b, there is a space over the entire left and right sides.

(3). Back frame Next, the details of the backrest 3 will be described. First, the structure of the back frame 41 and the attachment structure to the back support column 16 will be described. For example, as can be understood from FIG. 7, the side frame 50 and the lower frame 42 constituting the back frame 41 have a V-shaped cross section that opens forward. Therefore, it is not easily deformed by the body pressure of the seated person. The side frame 50 is curved in a side view so that the lower portion thereof is in the foreground. Therefore, a lumbar support portion is formed on the flexible sheet 48. On the other hand, the lower frame 42 is gently bent forward in a concave shape in a plan view.

As can be understood from FIG. 7, the side frame 50 is basically V-shaped with a forward-facing opening, but the upper end portion is formed in a U-shaped shallow groove shape. On the other hand, the left and right ends of the upper frame 51 continuous with the side frame 50 are formed of a flat plate-shaped hinge portion 54 bent in a U shape in a side view. The hinge portion 54 is deformed and the posture of the backrest 3 is changed, so that the lower end of the backrest 3 is advanced by sitting.

While the connecting portion 27 of the back support column 16 is curved upward and convexly in the rear view, the dome portion 55 opened downward in the left and right middle portions of the upper frame 51 so as to fit into the connecting portion 27 of the back support column 16 from above. Is forming. For example, as shown in FIG. 2, the curl portion 53b is also formed with a downward opening groove 55'corresponding to the connecting portion 27 of the back support column 16.

Further, the portions of the left and right ends of the upper frame 51 sandwiching the dome portion 55 are inclined so as to be higher toward the left and right outer sides (lower toward the dome portion 55), and the upper frame 51 as a whole is inclined. When viewed as a rear view, it has a pan-shaped shape that is curved downward. Correspondingly, the curl portion 53b also has a pan-shaped shape that is convex downward when viewed from the rear.

As shown in FIG. 5A, branch rods 56 projecting outward on the left and right sides are integrally formed at the upper ends of the left and right back columns 16, while on both left and right sides of the dome portion 55 of the upper frame 51. Formed a groove 57 into which the branch rod 56 fits. In this way, by fitting the upper frame 51 into the branch rod 56, the support strength is increased and the twist prevention function is strengthened.

The upper frame 51 and the branch rod 56 are fastened to both by a screw inserted from below. A nut into which a screw is screwed is arranged on the upper frame 51. In FIG. 5A, the screw insertion hole 58 of the branch rod 56 is visible. As can be understood from FIG. 1 (B), the left and right vertical frames 26 constituting the support column 16 have a groove-like shape having a flat cross section V-shaped opening forward.

(4). Connection structure between the back frame and the seat holding frame In the present embodiment, the seat holding frames 46 and 47 are attached to the back frame 41 after first attaching the upper seat holding frame 46 to the back frame 41. Next, as shown in FIG. 5B, the lower sheet holding frame 47 is attached by stacking it on the back frame 41. Therefore, the curl portion 53b of the upper seat holding frame 46 fits into the upper frame 51 of the back frame 41, and the side member 52 of the upper seat holding frame 46 fits into the side frame 50 of the back frame 41. , It is done in a series. The flexible sheet 48 is attached to the sheet holding frames 46 and 47 in advance by the method described later.

Then, for example, as shown in FIG. 6, as a fitting means for the curl portion 53b and the upper frame 51, the upper frame 51 is engaged with the first engaging hole 60 and the second engaging hole in order from the middle left and right to the outside. While the mating hole 61 and the third engaging hole 62 are formed so as to open a pair of left and right upwards, the front surface of the curl portion 53b has a first corresponding to the engaging holes 60, 61, 62. The first to third engaging protrusions 63 to 65 are provided. The engaging holes 60 to 62 and the engaging protrusions 63 to 65 form the engaging portion described in claim.

In this case, the first engaging hole 60 has a simple shape that opens to the rear and the top, but the second engaging hole 61 has a bag shape of a rear opening having an upper inner surface, and the third engaging hole 62 has a bag shape. It is shaped like a bag that also opens downward. On the other hand, the second engaging protrusion 64 has a T-shaped claw shape when viewed from the side, and is fitted into the second engaging hole 61 by deformation against elasticity.

Then, the upper end of the second engaging projection 64 abuts on the upper inner surface of the second engaging hole 61, and the upper shell 53 (the curl portion 53b) is held so as to be immovable upward. The front surface of the upper part of the second engaging protrusion 64 is inclined in a side view so that it can be smoothly fitted into the second engaging hole 61 against elasticity (due to elastic deformation, the claw at the upper end). The part moves back and forth.). The second engaging protrusion 64 is fitted in the second engaging hole 61 so as not to be displaced in the front-rear direction and the left-right direction. Therefore, the second engaging protrusion 64 and the second engaging hole 61 have a positioning of the upper shell 53 in the front-rear direction and an upward pull-out prevention function.

The third engaging protrusion 65 has an L-shaped side view, and when the third engaging protrusion 65 fits into the third engaging hole 62, the upper shell 53 (the curl portion 53b) is displaced back and forth. It is held incapable. A hanger and a bed rest can be attached to the upper frame 51, but the description of this point will be omitted.

In FIGS. 3 and 4, the back frame 41 is displayed in a state viewed from the front, and the seat holding frames 46 and 47 are displayed in a state viewed from the back (a state inverted by about 180 °). As can be understood from these FIGS. On the side frame 50 of the back frame 41, a pair of left and right first touch stopper pieces 69 that sandwich the positioning protrusion 67 from the left and right, and a flat view gate type first claw catch 70 into which the downward claw 68 is fitted from above are three up and down. It is formed step by step.

As a means for attaching the lower sheet holding frame 47 to the back frame 41, first, an upward claw 71 is projected from the upper end of the upright portion 47b of the lower sheet holding frame 47, a second positioning protrusion 72 is formed below the upright claw 71, and further. , While lateral claws 73 are provided on the left and right ends of the horizontal portion 47a, a second claw catch 74 into which the upward claws 71 are fitted from below and a second positioning protrusion 72 are fitted from the front to the side frame 50 of the back frame 41. A round second touch stopper piece 75 is formed, and the lower frame 42 is provided with a side view gate type third claw catch 76 with which the lateral claws 73 are engaged.

The positioning protrusion 67, the downward claw 68, the first touch stopper piece 69, the first claw catch 70, the upward claw 71, the second positioning protrusion 72, and the lateral claw 73 each form a part of the engaging portion described in the claims. ing.

(5). Connection procedure-Others When assembling the backrest 3, first, by moving the upper seat holding frame 46 from top to bottom, the curl portion 53b is attached to the upper frame 51, and at the same time, the side member. 52 is fitted into the side frame 50 and mounted. At this time, since the upper portion of the back frame 41 is sandwiched from the front and back by the side member 52 of the upper seat holding frame 46 and the curl portion 53b, the upper seat holding frame 46 is placed with respect to the back frame 41. Can be installed smoothly.

Further, regarding the relationship between the side member 52 and the side frame 50, the downward movement of the side member 52 causes the first positioning protrusion 67 to be fitted between the first touch stopper pieces 69, and the downward claw 68 is the first. Enter the claw catch 70 from above. As a result, the side member 52 is held so as not to be displaced in the left-right direction and the front-back direction.

Then, with the upper sheet holding frame 46 attached to the back frame 41, first, as shown in FIG. 5B, the upward claw 71 of the lower sheet holding frame 47 is first caught by the second claw catch 74 of the side frame 50. When the lower sheet holding frame 47 is pressed against the back frame 41 with the left and right second claw catches 74 as fulcrums, the second positioning protrusion 72 is fitted between the second touch stopper pieces 69. The lateral claw 73 engages with the third claw catch 76 by being caught and deformed against its elasticity.

Since the upper and lower seat holding frames 46 and 47 are attached to one flexible sheet 48, when the lower sheet holding frame 47 is attached to the back frame 41, the upper and lower seat holding frames 46 and 47 are flexible. The sheets 48 are pulled closer to each other. Therefore, the upper and lower sheet holding frames 46 and 47 are held so as not to be able to move up and down. As shown in FIG. 2, the lower seat holding frame 47 is fixed to the lower frame 42 of the back frame 41 with screws (not shown). The screw is located in the middle left and right, and is hidden by the upper end of the second interlocking link 36. Therefore, the lower seat holding frame 47 can be fixed to the lower frame 42 without deteriorating the aesthetic appearance.

As shown in FIG. 8, a nut holding groove 78 opened upward is provided in the left and right middle portions (upper end portion of the dome portion 55) of the upper frame 51, and a nut (not shown) is provided in the nut holding groove 78 from above. ) Can be fitted. At the upper end of the back column 16, there is a screw hole 79 that communicates with the nut holding groove 78. A hanger (not shown) can be attached by screwing a screw into the nut from below.

FIG. 7 shows the mounting relationship between the side member 52 and the side frame 50. The edge member 49 is hooked to the boss 80 provided on the seat holding frames 46 and 47. Therefore, the edge member 49 is provided with a hole 81 into which the boss 80 is fitted. The boss 80 also projects from the front surface of the outer peripheral edge of the curl portion 53b. The edge member 49 is formed with a large number of cutout holes for avoiding interference between the claws 68, 71, 73 and the positioning protrusions 67, 72.

For example, as shown in FIG. 6, a group of vertically long slits 82 are formed side by side on the curl portion 53b of the upper sheet holding frame 46 for weight reduction and the like. Further, a notch 83 opened forward is formed between the left and right ends of the horizontally long frame portion 53a and the side member 52.

(6). Cushion type specification 1
In the cushion type shown in FIGS. 9 to 14, the back plate 85 is used as an example of the substrate of the body support. When the back plate 85 is used, the upper shell 53 has a different form from that of the mesh type. The parts common to the mesh type and the cushion type are shown by the common reference numerals in the drawings, and the description thereof will be omitted unless necessary.

Side members (side edges) 86 that overlap the side frames 50 of the back frame 41 are provided on both left and right sides of the back plate 85, and upper members (upper edges) to which the upper shell 53 is attached to the upper ends of the back plate 85. 87 is provided, and a lower member (lower edge) 88 that overlaps the lower frame 42 of the back frame 41 from the front is provided at the lower end of the back plate 85.

The portion of the back plate 85 surrounded by the side member 86 and the lower member 88 becomes the main body 90 that has entered the space surrounded by the back frame 41 (invaded into the back side of the members 86 and 88). There is. Therefore, the main body 90 is stepped backward from the side member 86 and the lower member 88, and the stepped portion is a wall indicated by reference numeral 90a. Therefore, the back plate 85 has a generally shallow tray-like appearance. The main body 90 has a depth of about half of the front-rear thickness dimension of the side frame 50. Therefore, the main body 90 is surrounded by the back frame 41 and is entirely housed in the space, and does not protrude behind.

The cushion material 91 is fitted in the main body 90. As shown in FIGS. 13 and 14, the cushion material 91 is composed of a main cushion material 91a fitted into the main body 90 and a thin auxiliary cushion material 91b overlapping the surface thereof, and the auxiliary cushion material 91b is the skin. It is covered with material 92. The auxiliary cushion material 91b overlaps the side member 86, the lower member 88, and the upper shell 53, and is covered with the skin material 92 (see FIG. 9A). The skin material 92 is made of cloth. Further, the auxiliary cushion material 91b is made of a thin urethane sheet having a thickness of about 2 to 3 mm, and is laminated on the back surface of the skin material 92.

The skin material 92 is formed in a bag shape, and the back plate 85 and the upper shell 53 are completely covered with the bag-shaped skin material 92. Further, although the display in the drawing is omitted, an edge member made of a resin sheet is attached to the back surface of the upper end portion and the lower end portion of the main cushion material 91a by sewing or the like, and this edge member is attached to FIG. (C), fitted and locked to the upper and lower hooks 98 shown in FIG. Therefore, the main cushion material 91a is firmly positioned.

Since the auxiliary cushion material 91b is interposed on the back side of the skin material 92, even if the seated person's body hits the front surface of the side member 86 and the lower member 88, the contact is alleviated. Even when the portion of the side member 86 hits the top plate of the desk or the like, it is buffered and the skin material 92 is prevented from being torn. Further, in the state where the skin material 92 is attached, the hardness of the front surface of the cushion material 91 attached to the concave main body 90 and the front surface of the side member 86 and the lower member 88 where the main cushion material 91a does not overlap is hard. It becomes difficult to remember the extreme discomfort due to the difference.

Although the upper shell 53 is also provided in the present embodiment, since the upper shell 53 has the back plate 85 in the present embodiment, the upper shell 53 does not include the horizontally long frame portion 53a of the first embodiment (it is not necessary in the first place), and roughly. Has the same form as the curl portion 53b of the first embodiment. Since the relationship (mounting structure) with the upper frame 51 is the same as that of the first embodiment, the description thereof will be omitted.

For example, as shown in FIG. 12A, the above-mentioned upper member 87 is provided at the upper end of the back plate 85. The upper member 87 is horizontal and has a plate-like shape protruding backward. The side engaging pieces 94 are provided on the left and right ends of the upper shell 53, while the back plate 85 has the upper end of the side member 86 slightly higher than the upper member 87, so that the side engaging pieces 94 are provided. The side fitting portion 95 to which is fitted is formed.

Further, while the center engaging piece 96 is projected forward in the left and right middle portions of the upper shell 53, the pair of left and right center fitting ribs 97 into which the center engaging piece 96 enters the upper member 87 of the back plate 85 are 97. The front end of the upper shell 53 is in contact with the rear end of the center fitting rib 97. Therefore, as is clearly shown in FIG. 14, the front end of the upper shell 53 is in a state of being stepped down from the lower surface of the upper member 87. However, since the degree of step drop is slight, the upper member 87 and the upper shell 53 are smoothly continuous. The center fitting rib 97 is L-shaped, so that the upper shell 53 is held so as not to be vertically displaced.

The upper shell 53 is restricted from the left-right position, the front-rear position, and the up-down position with respect to the upper member 87 by the fitting of the engaging pieces 94 and 96 with the fitting portion 95 and the fitting rib 97. As described above, as shown in FIG. 12A, the upper member 87 is in a state of being stepped down from the upper end of the side member 86, so that the main cushion material 91a can be held on the upper surface of the upper member 87 without lateral slippage. ..

Since the upper shell 53 has a hole for forming protrusions, an auxiliary cushion material 91b (here, a urethane sheet) is attached to the back surface (inner surface) in a bag shape as described above. Covering with the skin material 92 is preferable because it can prevent deterioration of the aesthetic appearance. The skin material 92 is fixed to the upper shell 53 with, for example, a tacker (may be adhered or the like). Further, also in the present embodiment, the upper shell 53 is provided with the first to third engaging projections 63 to 65 shown in FIG. 6, but since the skin material 92 is formed in a bag shape, the first The third engaging protrusions 63 to 65 are exposed from the holes made in the skin material 92.

For example, as shown in FIG. 12B, left and right horizontally long retractable slits 89 are formed in the upper portion of the back plate 85 in order to prevent the skin material 92 from floating. A recess 89a is formed on the back side of the retractable slit 89, the skin material 92 is fixed by sewing or the like, and the stopper plate 89b is fitted in the recess 89a. The stopper plate 89b is inserted into the pull-in slit 89 from the front side. The stopper plate 89b is pulled out to the back side in a state where the cushion material 91 is crushed and the skin material 92 is forcibly pulled, and then the skin material 92 is pulled toward the front side. The stopper plate 89b is fitted into the recess 89a in a predetermined posture.

If the pull-in stopper is hook-shaped, it may come off due to some momentum, but in this embodiment, the stopper plate 89b has a large area and overlaps the main body 90 from behind, so that it cannot be pulled out firmly. Is retained. Further, since it is fitted in the recess 89a, there is no step and the appearance is good (when covered with the skin material 92, the existence of the stopper plate 89b cannot be known at all).

As shown in FIG. 9, in the lower part of the back plate 85 (the lumbar support portion), a group of left and right horizontally long slits 93 is formed in multiple stages in order to facilitate bending deformation due to body pressure. As is clearly shown in FIG. 13, a chevron-shaped buffer portion 93a in a plan view is formed at both left and right ends of the strip-shaped portion divided by the upper and lower slits 93. Therefore, the bending deformation of the area provided with the group of slits 93 becomes easier.

As partially shown in FIG. 12B, notches 91c opened to the left and right outward are formed at the left and right lower end portions of the main cushion material 91a in order to avoid interference with the buffer portion 93a.

The attachment structure of the back plate 85 to the back frame 41 is basically the same as that of the first embodiment. That is, the back plate 85 is provided with a first positioning protrusion 67, a downward claw 68, a second positioning protrusion 72, and a lateral claw 73. However, in the present embodiment, the upward claw 71 of the first embodiment is not required, so that it is not provided. In the present embodiment, the back plate 85 is attached by stacking it on the back frame 41, shifting it downward, and then pressing the lower member 88 against the lower frame 42 of the back frame 41. Since the skin material 92 is formed in a bag shape, the first positioning protrusion 67, the downward claw 68, the second positioning protrusion 72, and the sideways claw 73 are exposed from the holes provided in the skin material 92.

In the present embodiment, the upper shell 53 is connected to the back plate 85 via the skin material 92, but since the skin material 92 is slightly stretched, the back plate 85 can be attached and the upper shell 53 can be attached separately. Since the upper member 87 of the back plate 85 overlaps with the upper shell 53, it can be said that it is rational to attach the upper shell 53 to the upper frame 41 first and then attach the back plate 85 to the side frame 50. As shown in FIG. 14B, the back plate 85 is fixed to the lower frame 42 of the back frame 41 with screws 77.

Although not dared to mention, the skin material 92 does not need to be formed in a bag shape. Auxiliary cushioning material is not always necessary, and conversely, it is possible to use a plurality of auxiliary cushioning materials. It is not necessary to provide the upper shell, and if it is provided, it can be fixed to the back plate by welding or the like, or can be integrally molded.

In the present embodiment, since the main cushion material 91a fits inside the thickness of the back frame 41 (an example of the peripheral frame body) in the front-rear direction, the backrest 3 can be made thin and compact as a whole. That is, since the main cushion material 91a can be arranged by effectively utilizing the dead space surrounded by the back frame 41, the cushioning property is higher than that in the case where a thick cushion material is stretched on the front surface of the substantially flat back plate. The thickness of the backrest 3 can be reduced to make it more compact while retaining the above.

Further, if the back plate 85 is damaged for some reason, only the back plate 85 can be replaced. Therefore, it is economical. Further, although the back plate 85 has a tray-like shape and high rigidity, since it and the back frame 41 reinforce each other, it can contribute to improving the strength of the backrest 3 as a whole.

In the present embodiment, since a plurality of types of body pressure receiving members (seat holding portions 46, 47 or back plate 85) can be replaced with the common back frame 41, the specifications of the backrest 3 are changed to a cushion type or a mesh type. You can easily do what you do. Therefore, in assorting a plurality of types of backrests 3, it is possible to reduce the time and effort required for designing, and it is also possible to standardize the members and contribute to cost reduction. Further, in each type, the back frame 41 can be exposed at the back, which is beneficial in terms of unification of design.

(7). Cushion type specification 2
Next, the leather skin material type will be described with reference to FIGS. 15 to 20. In the embodiment of the leather skin material type, vinyl leather as an example of the leather skin material 101 is used, and the skin material 101 and the cushion material are replaced with the cushion material 92 and the cushion material 91 of the cushion type specification 1. It is equipped with 102. The parts common to the cushion type specifications 1 and 2 are shown by the common reference numerals in the drawings, and the description thereof will be omitted unless necessary.

As shown in FIGS. 15 to 17, the cushion material 102 is fitted in the main body 90 of the back plate 85. The cushion material 102 is composed of a main cushion material (main cushion material) 102a fitted into the main body 90, and two thin additional cushion materials (secondary cushion materials) 102b and 102c overlapping the surface thereof. The back plate 85 and the cushion material 102 are covered with the skin material 101. The additional cushion material 102b covers the entire front surface of the main cushion material 102a and overlaps the side member 86 and the lower member 88. The additional cushion material 102c covers the entire front surface of the additional cushion material 102b. That is, the side member 86, the lower member 88, and the main cushion material 102a are overlapped with each other, and the additional cushion materials 102b and 102c are arranged so as to overlap each other.

Further, although the display in the drawing is omitted, an edge member made of a resin sheet is attached to the back surface of the upper end portion and the lower end portion of the main cushion material 102a by sewing or the like, and the edge member is attached to the upper and lower portions. It is fitted and locked to the hook 98, and the additional cushion materials 102b and 102c are fixed to the main cushion material 102a by sewing (adhesive or the like). Therefore, the cushion material 102 is firmly positioned.

As shown in FIGS. 15, 17, and 18, the skin material 101 is formed in a bag shape, and the back plate 85, the upper shell 53, and the cushion material 102 are completely covered with the bag-shaped skin material 101. The skin material 101 is composed of a front material 101a and a lining material 101b, and includes a bag-shaped portion 105 in which a portion covering the upper shell 53 and the upper portion of the back plate 85 is sewn with a sewing thread 104. The surface material 101a is composed of a leather material 101c and an auxiliary cushion material 101d laminated on the back surface of the leather material 101c. The leather material 101c and the lining base material 101b are made of leather (vinyl leather in this embodiment) having a lower elasticity than the cloth skin material 92 (see FIG. 9 and the like). The auxiliary cushion material 101d is made of, for example, a thin urethane sheet having a thickness of about 2 to 3 mm, and is laminated on the back surface of the leather material 101c by adhesion or the like.

As shown in FIG. 18, in the skin material 101, the edge member 49 is fixed to the left and right edge portions and the lower edge portion of the upholstery base material 101a and the lower edge portion of the backing base material 101b by sewing or the like. .. The edge member 49 is hooked to a boss 80 (see FIG. 11) projecting from the back surface of the side member 86 and the lower member 88 of the back plate 85. On the left and right edges of the lining base material 101b, a pair of upper and lower mounting portions 106 to be hooked to the boss 80 are provided for each of the left and right edges. When attaching the skin material 101 to the back plate 85, the bag-shaped portion 105 is put on the upper shell 53 and the upper part of the back plate 85, and the edge member 49 and the attachment portion 106 are hooked to the boss 80 on the back surface of the members 86 and 88. Will be done. The edge member 49 is attached to the boss 80 by winding the upholstery materials 101a and 101b around the peripheral edges of the members 86 and 88. Further, after the attachment portion 106 of the upholstery base material 101b is attached to the boss 80 of the side member 86, the edge member 49 of the upholstery base material 101a is attached.

As shown in FIGS. 17 and 18, the upholstery opening 113 through which the first to third engaging protrusions 63, 64, 65 (see also FIG. 9) are inserted into the upholstery material 101b in the bag-shaped portion 105. , 114, 115 and the upholstery opening that exposes the shell-side engaging holes 66a (see also FIGS. 6 and 9) that engage with the frame-side protrusions 66b (see FIG. 6) provided at the left and right ends of the upper frame 51. A portion 116 is provided. Since the upholstery openings 113 to 116 are provided in the upholstery material 101b, after the skin material 101 is attached to the upper shell 53 and the back plate 85, the engagement protrusions 63, 64, 65 and the engagement holes 66a Is configured to be exposed.

As shown in FIGS. 15 and 16, pull-in slits 103a, 103b and pull-in openings 103c for preventing the surface upholstery material 101a from floating are formed in the upper portions of the cushion materials 102a, 102b, 102c. ing. The slits 103a and 103b and the opening 103c are formed so as to be aligned with the retracting slit 89 of the back plate 85. The stopper plate 89b is fixed to the surface material 101a via the pulling cloth 89c. The front side edge portion of the pulling cloth 89c is fixed to the left and right horizontally long pulling portions 101e provided in the upholstery base material 101a by sewing or the like. Further, the back side edge portion of the pulling cloth 89c is fixed to the left and right horizontally long stopper plates 89b by sewing or the like.

At the time of pulling in the surface material 101a, the stopper plate 89b is inserted into the opening 103c, the slit 103b, the slit 103a, and the drawing slit 89 from the front side of the backrest 3, and the cushion material 102 is crushed to forcibly push the skin material 101. In the pulled state, the stopper plate 89b is pulled out to the back side, and then the skin material 101 is pulled toward the front, and the stopper plate 89b is fitted into the recess 89a in a predetermined posture.

The pull-in opening 103c of the additional cushion material 102c is opened larger than the pull-in slits 103a and 103b of the cushion materials 102a and 102b, so that the pull-in portion 101e of the surface covering material 101a can be easily pulled in to the back plate 85 side. ing. Further, by connecting the upholstery base material 101a and the stopper plate 89b via the pulling cloth 89, a space is provided between the upholstery base material 101a and the stopper plate 89b. As a result, it is possible to prevent the pull-in portion 101e from being pulled too much toward the back plate 85 side, and to prevent the cushioning materials 102a and 102b from being extremely compressed around the pull-in portion 101e and to prevent the back comfort from deteriorating. The aesthetic appearance of the retracted portion 101e of the upholstery material 101a can be improved.

In this embodiment, the additional cushioning materials 102b and 102c are arranged between the surfaces of the side members 86 and the lower member 88 of the back plate 85 and the skin material 101, so that the skin material 101 is made of leather having low elasticity. Even if it is a thing, the edge of the skin material 101 can be rounded, the poorness of the backrest 3 when viewed from the side can be eliminated and the aesthetic appearance can be improved, and the edge of the skin material 101 is a desk. It is possible to reduce damage to the skin material 101 when it comes into contact with the like.

Further, even when the user's body hits the edge of the backrest 3, the additional cushioning materials 102b and 102c can soften the contact, so that the feeling of use such as back comfort can be improved. Further, since the main cushion material 102a and the additional cushion materials 102b, 102c are configured in a laminated manner, for example, the main cushion material 102a and the additional cushion materials 102b, 102c are formed by die-cutting a flat plate-shaped cushion material. Therefore, it is possible to suppress an increase in manufacturing cost.

Further, since the skin material 101 has an auxiliary cushion material 102c laminated on the back surface of the surface material 101a made of leather, the backrest 3 can be made more rounded by making the edge of the skin material 101 more rounded. The aesthetic appearance can be further improved, and damage to the edge of the skin material 101 can be further reduced.

Further, in the embodiment of the cushion type specification 2, the additional cushion materials 102b and 102c are additionally arranged with respect to the embodiment of the cushion type specification 1, and the leather skin material 101 is changed to the back plate. By standardizing the 85, it is possible to easily change between the cloth specification and the leather specification while suppressing the increase in the manufacturing cost. For this reason, when arranging a plurality of types of chairs, it is possible to reduce the time and effort of designing, and it is also possible to share the members and contribute to cost reduction. Further, if the main cushion materials 91a and 102a are shared between the cushion type specifications 1 and 2, further cost reduction can be realized.

Next, an example of a method for manufacturing the bag-shaped portion 105 of the skin material 101 will be described with reference to FIGS. 18 to 20. As shown in FIGS. 19 (1) and 20 (1), in the upholstery base materials 101a and 101b before sewing, the portion to be the bag-shaped portion 105 is the size of the upholstery base material 101a and the upholstery base material 101b. Is different. The outer edge portions 107a and 107b sewn to form the bag-shaped portion 105 are formed so that the outer edge portion 107a of the outer upholstery material is longer than the outer edge portion 107b of the upholstery base material. The outer edge portions 107a and 107b are provided with notches 108a and 108b for alignment.

As shown in FIGS. 19 (2) and 20 (2), the smaller size lining material 101b (one of the upholstery materials) is stretched, and the outer edge portion 107b of the lining material is the larger size. It is arranged along the outer edge portion 107a of the outer upholstery material 101a (the other upholstery material). At this time, the upholstery base material 101b is stretched so that the upholstery base material notch 108b overlaps the upholstery base material notch 108a. For example, the outer edge portions 107a and 107b are stretched so as to stretch the backing base material 101b (smaller size upholstery material) without stretching the outer upholstery base material 101a (larger size upholstery material). Align.

As shown in FIGS. 19 (3) and 20 (3), in a state where the backing material 101b is stretched, the sewing thread 104 is sewn along the outer edge portions 107a and 107b of the upholstery material, and the upholstery material is sewn. The materials 101a and 101b are sewn together.

As shown in FIGS. 19 (4) and 20 (4), the stretched state of the backing material 101b having the bag-shaped portion 105 is eliminated. As the lining material 101b tries to return to its original size, the outer edge portion 107a of the outer lining material sewn to the outer edge portion 107b of the lining material shrinks, and the outer lining material near the outer edge portion 107a of the lining material shrinks. Gathers 109 (see FIGS. 18 (A) and 20 (5)) are formed on the material 101a.

After that, as shown in FIG. 19 (5), by turning over the upholstery materials 101a and 101b, the skin material 101 having the bag-shaped portion 105 is formed. In this way, the outer edge portions 107a and 107b are sewn together in a state where the lining base material 101b is stretched larger than the front lining base material 101a, and then the stretched state is eliminated. Gathers 109 can be easily formed on the upholstery material 101a. Then, by turning over the upholstery materials 101a and 101b after sewing, it is possible to form the skin material 101 having a three-dimensional bag-shaped portion 105 having a bulge on the upholstery material 101a at the position where the gathers 109 are formed.

In the skin material 101, the gathers 109 are formed so as to correspond to positions covering the upper edge of the side member 86 of the back plate 85 curved in a U shape in a side view and the edge of the upper shell 53. That is, the gathers 109 are formed corresponding to the positions where the edges of the back plate 85 and the upper shell 85 cover the curved portions. As a result, the occurrence of wrinkles and distortion of the skin material 101 at the portion where the bag-shaped portion 105 of the skin material 101 covers the back plate 85 and the outer edge portion of the upper shell 85 can be suppressed, and the aesthetic appearance of the backrest 3 can be improved.

In this embodiment, the leather material 101c and the lining material 101c of the surface material 101a are both leather (vinyl leather), but the surface material 101a has an auxiliary cushion material 101d on the back surface of the leather material 101c. Therefore, the elasticity is lower than that of the lining base material 101c. That is, the upholstery materials 101a and 101b have different expansion and contraction performances. However, one upholstery material and the other upholstery material may have the same expansion and contraction performance, for example, they are formed of the same material and have the same thickness. Further, the skin material 101 is not limited to the one made of leather, and may be made of cloth.

Although the specific examples of the present invention have been described above, the present invention can be embodied in various ways. For example, although the embodiment has been applied to the backrest, it can also be applied to other body supports such as the seat. Needless to say, when applied to the backrest, it does not have to be a type in which the lower part advances by sitting.

Further, in the above embodiment, in the cushion type specification 2 having the leather skin material 101, two additional cushion materials 102b and 102c are provided as the sub-cushion material, but in the present invention, the sub-cushion material is 1. It may be a sheet or may be composed of three or more sheets.

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

3 Backrest (an example of body support)
85 Tergum (an example of a board)
92 Skin material (other skin material)
101 Skin material (skin material for body support of chair)
101a Upholstery lumber (the other upholstery lumber)
101b Lining material (one of the upholstery materials)
101c Leather material 101d Auxiliary cushion material 109 Gather

Claims (5)

A method for manufacturing an epidermis material used for a backrest or other body support having a substrate and a bag-shaped epidermis material covering the substrate.
In forming the bag-shaped skin material by sewing the outer edges of one upholstery material and the other upholstery material and then turning them over.
The outer edges are sewn together in a state where the one stretched material is stretched larger than the other stretched material, and then the stretched state is eliminated, so that the other stretched material is stretched. Gathers are formed on the lumber, and the sewn upholstery material is turned over to form the bag-shaped skin material.
A method for manufacturing a skin material for a body support of a chair. The gathers are formed corresponding to the positions where the edges of the substrate cover the curved portions.
The method for manufacturing a skin material for a body support of a chair according to claim 1. The size of the one upholstery material and the other upholstery material are different,
The outer edges are sewn together by stretching the smaller upholstery material without stretching the larger upholstery material.
The method for manufacturing a skin material for a body support of a chair according to claim 1 or 2. The one upholstery material has higher elasticity than the other upholstery material.
The method for manufacturing a skin material for a body support of a chair according to any one of claims 1 to 3. The other upholstery material is made of leather.
The method for manufacturing a skin material for a body support of a chair according to any one of claims 1 to 4.

Images