JP6864976B2 - Upholstery locking structure, headrests, and chairs - Google Patents

Description

The present invention relates to upholstery locking structures, headrests, and chairs. More specifically, the present invention provides suitable structures for upholstery applied to, for example, headrests, seats, or upholstery members of chairs, and structures of such upholstery. Regarding headrests and chairs to be equipped.

In the backrest of a chair, a groove is formed in the back frame member constituting the backrest along the longitudinal direction (in other words, the axial direction) of each frame member constituting the back frame member, and with respect to the back frame member. A strip-shaped member is attached to the edge of the stretched fabric, and the strip-shaped member attached to the stretched fabric is inserted into the groove of the back frame member and fitted to the back frame member. In some cases, a structure in which the upholstery is stretched is adopted.

As a conventional upholstery structure for upholstering the upholstery with respect to the back frame member, for example, as shown in FIG. 31, the surfaces of the pair of frame hooks 102a and 102b facing each other in the frame 101. In addition to providing a concave groove 105 along the inner edge, an edge member 104 having a hook-shaped portion 104a at the tip portion is fastened to each of the pair of opposite edge portions in the upholstery 103, and the pair of upholstery 103 has the above-mentioned pair. The edge portion is wound around the outer edge from the front surface of the pair of frame rods 102a and 102b of the frame body 101 to the back surface, and the hook-shaped portion 104a of the edge member 104 is formed in the concave groove 105 of each of the pair of frame rods 102a and 102b. There is one in which the upholstery 103 is stretched on the frame 101 by engaging the folded pieces (Patent Document 1).

Japanese Unexamined Patent Publication No. 2006-11001

However, in the upholstery structure of the upholstery of Patent Document 1, although the edge member 104 is hard to come off from the frame frames 102a and 102b due to the engagement between the hook-shaped portion 104a and the concave groove 105, it stops at the edge of the upholstery 103. It is required that the hook-shaped portion 104a having a folded piece is formed on the edge member 104 to be worn, and when the upholstery 103 is attached to the frame 101, the frame pieces 102a and 102b and the upholstery 103 It is necessary to fit the hook-shaped portion 104a into the recessed groove 105 so that it can be inserted into the space and wrap around, which complicates the structure of the edge member 104, which takes time and effort for molding, and also requires assembly work for the backrest. There is a problem that it becomes complicated and takes time and effort.

Therefore, according to the present invention, the locking structure of the upholstery can be surely stretched by making it difficult for the edge of the upholstery to come off from the upholstery fixing member by using a member having a simple structure and a simple operation. Also, it is an object of the present invention to provide a headrest and a chair having a locking structure of this upholstery.

In order to achieve such an object, the locking structure of the upholstery of the present invention is for upholstery in which the edge of the upholstery provided with a plate-shaped locking member at the edge is inserted into the upholstery fixing member to which the upholstery is attached. the groove is provided, the pressing portion provided on the other surface together with the end portion of the at least one surface on the locking member of the wall surface defining the coated cloth groove entrance portion of the groove coated cloth provided a return abutting, the holding section Has flexibility that allows it to be deformed at least in the direction of increasing the distance between the return and the end of the locking member inserted into the upholstery groove, with the end of the locking member caught on the return, on the opposite side of the return. A backup part is further provided to prevent deformation in the direction of contacting the holding part at the position of, and widening the distance between the holding part and the return, and the edge of the upholstery passes between the return and the holding part. It is inserted into the upholstery groove, and after being inserted, the end of the locking member is caught in the return to prevent the locking member from moving in the direction of being pulled out from the upholstery groove.

Further, in the locking structure of the upholstery of the present invention, the combination of the return portion and the pressing portion is provided so as to face each other so that the respective pressing portions are on the inside, and one backup portion is inserted between these pressing portions. By doing so, one backup portion may come into contact with both of the respective pressing portions of the combination to prevent deformation of both of the respective pressing portions of the combination at the same time.

Further, the headrest of the present invention is provided with the above-mentioned locking structure of the upholstery.

Further, the chair of the present invention is provided with the above-mentioned locking structure of the upholstery.

According to the locking structure of the upholstery of the present invention and the headrest and chair provided with the locking structure of the upholstery, the upholstery having the locking member at the end passes between the presser foot and the return and is stretched. When it is inserted into the ground groove, the end of the locking member comes into contact with the return and the movement in the direction in which the locking member is pulled out from the upholstery groove is prevented, so that the upholstery can be easily made into the upholstery groove. You will not be able to pull it out from. Therefore, it is possible to realize a structure in which the upholstery is surely stretched by a member having a simple structure. In addition, it is necessary to realize a structure in which the upholstery is surely stretched by a simple operation of passing the edge of the upholstery to which the locking member is attached between the holding portion and the return and inserting it into the groove for the upholstery. Will be possible.

Further, in the present invention, when the pressing portion is deformable in a direction of at least increasing the distance between the pressing portion and the return portion and the holding portion is further provided with a backup portion for preventing the deformation of the pressing portion, a locking member is attached. When the edge of the upholstery is passed between the barb and the presser foot and is to be inserted into the upholstery groove, the gap between the presser foot and the barb is widened by the deformation of the presser foot to easily pass through. On the other hand, when the end of the locking member inserted into the upholstery groove is caught in the return and the upholstery is to be pulled out from the upholstery groove, the interval between the return of the holding portion is increased. Since the backup portion prevents the deformation in the expanding direction, it is possible to more reliably maintain the state in which the end portion of the locking member is caught in the return. Therefore, it is possible to exert a sufficiently large locking force, and it is possible to cope with a case where a strong locking structure is required because the external force applied to the upholstery is large, for example. ..

Further, in the present invention, when the backup portion is fitted between the respective pressing portions of the combination of the return portion and the pressing portion arranged so as to face each other, when the backup portion is fitted between the respective pressing portions, the holding portions of the respective holding portions in the facing arrangement combination Since the deformation prevention structure can be configured by a single backup unit, the structure for reliably stretching the stretch is simple, especially when the stretch is stretched so as to wrap the structure including the stretch fixing member. It can be realized by structural members and simple work.

It is a front perspective view which shows the appearance of the chair to which the upholstery fixing structure of the chair which concerns on this invention is applied. It is a side view which shows the relationship between the backrest of the chair, the seat outer shell, and the main frame. It is a perspective view of the inner shell of the seat of the chair as seen from above. It is a perspective view of the outer shell of the seat of the chair as seen from above. It is a perspective view seen from diagonally lower front which shows the relationship between a main frame, a reaction force applying mechanism, and a front link. It is a perspective view seen from diagonally rearward of the main frame. It is a perspective view which shows the back inner shell of the chair and one Embodiment of a back frame in a separated state. It is a perspective view which shows the back frame and the link member attached to this. It is a perspective view which shows one Embodiment of a link member in an assembled state. It is a perspective view which looked at the B component side from the A component side by disassembling the link member. It is a perspective view which shows the link member with a lever in an assembled state. It is a front view which shows one Embodiment of an inner shell. It is a perspective view seen from the back of the inner shell. It is a bottom view of the inner shell. It is a perspective view of the vicinity of the hypotenuse of the inner shell as seen from the bottom. It is a perspective view which shows the vicinity of the seam allowance relief part of the boundary part between the side side and the hypotenuse of the inner shell. It is a perspective view which shows one Embodiment of the cap which covers the bearing bracket part. It is a side view which shows one Embodiment of the back total walnut. It is a bottom view of the same back total walnut. It is a perspective view which shows one Embodiment of the edging member. It is explanatory drawing which shows the relationship between the front side upholstery and the back side upholstery, and the two-row upholstery groove of an inner shell by a cross-sectional view. It is a side view which shows one Embodiment of a headrest, and shows the relationship with a back frame. It is a perspective view seen from the bottom surface which shows the internal structure of the skirt part of a headrest inner shell. It is a front view which shows one Embodiment of a headrest core. It is a vertical cross-sectional view which shows one Embodiment of a headrest inner shell. It is a partially enlarged vertical cross-sectional view which shows the relationship between the headrest inner shell and the upholstery where the headrest core and the locking member are sewn on the edge together with one Embodiment of the upholstery groove. It is an exploded perspective view which shows the structure of the part related to the leg base of the chair. It is a vertical cross-sectional view which shows typically the structure of the pedestal support cylinder part of the leg base of the chair. It is the figure which shows the lower side part of the back frame enlarged. In the figure which shows the concept of the upholstery fixing structure of a chair, (A) shows the state before the upholstery was inserted into a ditch, and (B) shows the state where the upholstery was inserted into a ditch. It is a vertical cross-sectional view which shows the upholstery fixing structure of the conventional headrest.

Hereinafter, the configuration of the present invention will be described in detail based on the embodiments shown in the drawings. In the description of the present invention, "upper" and "lower", "front" and "rear", and "left" and "right" are defined (in other words) with reference to the seated person sitting on the chair. Means "top" and "bottom", "front" and "rear", and "left" and "right" when viewed from the seated person).

FIG. 1 shows an outline of an embodiment of a chair to which the present invention is applied. The chair of the present embodiment includes a leg body 1, a main frame 5 supported by the leg body 1, a synchro frame 8 to which a backrest 9 is attached, and a seat receiving member (seat frame or seat) to which a seat 7 is attached. It has 6 (referred to as an outer shell), and is mounted on the main frame 5 so as to be rockable by synchronizing the seat 7 and the backrest 9 with the synchro frame 8 and the front link 30 interposed therebetween. A headrest 86 is detachably attached to the upper side 57c of the back frame 57.

As the locking mechanism, for example, a mechanism in which a weight-responsive reaction force applying mechanism and a reaction force applying mechanism 37 using a coil spring 36 are used in combination is used. As shown in FIGS. 2, 5 and 6, slightly in front of the pedestal receiving portion 31 to which the pedestal 3 of the main frame 5 is connected, the synchro frame rotating shaft 32 penetrating the bearing portion 40 faces the vertical position. The upper lever link portion 8a branched in the vertical direction of the synchro frame 8 oscillatingly connected along the seat outer shell 6 is rotatably connected to the rear of the seat outer shell 6, while the lower side is rotatably connected. The force spring receiving portion 8b is provided so as to support the rear end portion of the reaction force applying mechanism 37 via the reaction force applying mechanism receiving shaft 33. The rear of the seat outer shell 6 and the lever link portion 8a of the synchro frame 8 are rotatably connected via the seat rear support shaft 50. On the other hand, the front of the seat outer shell 6 is preferably above the horizontal plane and does not reach the vertical plane, for example, 20 ° to 30 ° to less than 90 °, due to the front link 30 provided at the front end of the main frame 5. It is supported swingably between. The front link 30 is provided with a stopper lever 55 that determines one stroke end, and is provided so as to abut against the abutment / wall surface of the groove 56 of the main frame 5 and rotate further forward so that the front of the seat 7 does not go down. Has been done. Then, when the seated person leans against the backrest 9, the seat outer shell 6 is lifted diagonally upward and backward by the lever link portion 8a by the backward tilting operation of the synchro frame 8 centering on the synchro frame rotation axis 32. However, it is provided so as to raise the front link 30 connected to the front of the seat outer shell 6 to lift the entire seat outer shell 6 and to contract the coil spring 36 of the reaction force applying mechanism 37 to generate a reaction force.

A reaction force applying mechanism 37 is provided between the main frame 5 and the synchro frame 8 to generate a reaction force by the coil spring 36 that is compressed when the synchro frame 8 is tilted backward and tries to erect the synchro frame 8. There is.

According to the rocking mechanism configured as described above, when the seated person leans against the backrest 9, the backrest 9 and the synchro frame 8 synchronize while compressing the coil spring 36 (giving a reaction force to the backrest). It tilts backward about the frame rotation axis 32. At the same time, since the seat outer shell 6 is pulled backward by the swing of the lever link portion 8a at the tip of the synchro frame 8 and the front link 30, the weight of the seated person on the seat 5 is converted into a force for pushing back the backrest 9. It acts as a reaction force on the synchro frame 8. For this reason, a heavier person requires a larger force to tilt the backrest backward, and a lighter person requires a smaller force to tilt the backrest backward. That is, it is possible to obtain a rocking reaction force corresponding to the weight of the seated person as a locking reaction force with respect to the force of tilting the backrest backward. On the other hand, when the seated person tries to raise the upper body, the coil spring 36 is stretched along with the action of the locking reaction force due to the weight, and the synchro frame 8 is rotated in the direction of causing the backrest.

As shown in FIGS. 3 and 4, for example, the seat 7 mounted on the locking mechanism is swingably supported by the main frame 5 with the front link 30 and the synchro frame 8 interposed therebetween. It is composed of an outer shell 6, an inner shell 44 as a core material, a cushion placed on the outer shell 6, and an upholstery covering the cushion. The seat inner shell 44 is provided with slits 45 for sliding in the front-rear direction at four corners, and the seat outer is penetrated by a slider part 46 fixed to the seat outer shell 6 side by screwing. A seat 7 including a seat inner shell 44 above the shell 6 is slidably mounted back and forth. The slide of the seat 7 in the front-rear direction is regulated by fitting a stopper 48 that appears and disappears from the seat inner shell 44 into a plurality of positioning holes 47 provided in the seat outer shell 6, although not shown. It is provided in.

Further, the locking mechanism according to the present embodiment includes, for example, a locking mechanism (not shown) that enables the tilting posture to be fixed stepwise between the main frame 5 and the synchro frame 8 during the backward tilting operation of the synchro frame 8. It is provided so as to be fixed at the selected backward tilted position. In the lock mechanism, for example, a plurality of stages of engaging holes 49 are provided in the rear wall portion 41 of the main frame 5, and a lock plate (not shown) that selectively fits into the engaging holes 49 appears and disappears on the synchro frame 8 side. It is configured by preparing for possible. Here, even if the lock state is switched by the drive lever (not shown) by operating the locking operation lever (not shown), the lock mechanism slides on the lock mechanism when the lock plate cannot be switched. A self-holding function that holds the state of the drive lever until the situation is obtained is adopted.

In the case of the present embodiment, the backrest 9 is a bag-shaped upholstery that covers the rigid back frame 57, the flexible back inner shell 58, and the back inner shell 58, for example, as shown in FIGS. 1 and 7. (Hereinafter, referred to as total walnut 59). As shown in FIG. 7, the back frame 57 has, for example, a backrest portion 57a that is bent in a dogleg shape as a whole in a lateral view, and a back support rod portion 57b that is curved downward and extends forward. Reinforced resins with excellent strength, such as nylon containing glass fiber, polyamide resins such as polyacetal (POM), polypropylene (PP), and nylon, and materials other than resins, such as iron, aluminum alloys, and stainless steel, can also be used.

A back frame mounting seat 57d is integrally formed on the back support rod portion 57b of the back frame 57 so as to straddle between the left and right back support rod portions 57b, and a U-shaped cut is formed at each tip portion. A notch 57f is formed. Therefore, after hooking the portion of the notch 57f on the synchro frame rotating shaft 32, the back frame 57 is rotated about the same rotating shaft 32 so as to tilt backward, while the back frame mounting seat 57d is moved to the back frame of the synchro frame 8. The synchro frame 8 and the back frame 57 are integrated by placing them on the mounting bridge and fixing them with screws.

Further, a plurality of recesses 57g for attaching the upper side 58c of the back inner shell 58 are provided on the front surface side of the upper side 57c of the back frame 57, for example, four places in the case of the present embodiment. On the other hand, on the back side of the upper side 58c of the back inner shell 58, as shown in FIG. 13, a convex portion 58g fitted to the concave portion 57g of the back frame 57 is formed so as to project at a corresponding position. In a state where the concave portion 57g and the convex portion 58g are fitted, the upper sides 57c and 58c of the back frame 57 and the back inner shell 58 are respectively fixed by screwing from below so as to penetrate the concave portion 57g and the convex portion 58g. Are concatenated. The above-mentioned unevenness may be reversed between the back frame 57 and the back inner shell 58. For example, although not shown, the upper side 58c of the back inner shell 58 is directed from the back side toward the back side. The convex portion inward of the concave portion to be opened may be formed so as to project toward the convex portion provided on the surface side of the upper side 57c of the back frame 57.

On the other hand, the lower side 58a of the back inner shell 58 is rotatably connected to the back support rod portion 57b of the back frame 57 via a link member 62 so as to be movably supported back and forth. That is, as shown in FIGS. 2 and 8, the link mechanism 61 is formed between the back inner shell 58, the back frame 57, and the link member 62. As a result, when the lower end of the back inner shell 58 is moved rearward by rotating the link member 62 and tilting it backward, the back inner shell 58 is in a slightly forward tilted posture. Further, when the lower end 58a of the back inner shell 58 is moved forward by tilting the link member 62 forward, the back inner shell 58 can take a relatively lying state / relaxed posture. That is, the inclination of the back frame 57 (the same as the inclination of the backrest 9) is not changed, and only the inclination of the backrest surface (the surface formed by the back inner shell 58 and the total wrap 59 covering it) is relatively changed. The structure can be switched between a state in which the person leans forward and a state in which the person is laid down. Here, since the link mechanism 61 is provided so as to be able to switch between the front position and the rear position over the thought point, even if the seated person leans on the backrest 9 at both the front position and the rear position, The link member 62 rotates only in the direction in which the link member 62 is pressed against the side surface of the bearing bracket portion 57e of the back frame 57. Therefore, an unexpected situation in which the inclination of the back inner shell 58 is switched unintentionally does not occur.

As shown in FIGS. 9 to 11, the link member 62 constituting the link mechanism 61 is made of a synthetic resin molded product composed of the A component 63 and the B component 64 divided into two, and is a mating side forming a pair. The bearing bracket portion 57e of the back frame 57 of the member and the bearing bracket portion 58e of the back inner shell 58 are faced to each other so as to be sandwiched between them, and are fastened and integrated by fastening means such as a fastening screw 70 or a rivet. .. The A component 63 has a member constituting a plurality of pairs of links, for example, two shaft portions 65, and the B component 64 is provided with a recess 66 for receiving the two shaft portions 65 protruding from the A component 63 side. There is. In the present embodiment, an example of configuring as a single link having two kinematic pairs is given, but the present invention is not particularly limited to this, and in some cases, it may be configured as a compound link having three or more kinematic pairs. Needless to say.

A connecting portion 67 that also serves as a spacer for keeping the gap between the A component 63 and the B component 64 constant is provided between the shaft portions 65 and the receiving portion 66 at both ends constituting the kinematic pair of the link. The connecting portion 67 is provided with a connecting portion main body 67a having a length corresponding to a gap between the A component 63 and the B component 64 on either one of the A component 63 and the B component 64 constituting the link member 62. On the other hand, the receiving portion 68 may be provided. A concave portion 67b (or a convex portion) is formed on the tip surface of the connecting portion main body 67a, and a receiving portion 68 facing the concave portion 67b (or a convex portion) is formed to form an inro joint so as to ensure accurate positioning and strength. It is provided in. A female screw 69 is formed in the connecting portion main body 67a of the B component 64, and a through hole 71 for passing the fastening screw 70 is formed in the receiving portion 68 of the facing A component 63, and the A component 63 and the B component are formed. It is set to 64 and integrated by fastening with the fastening screw 70.

The A component 63 and the B component 64 are made of resin. In this embodiment, a polyamide resin such as polyacetal (POM), polypropylene (PP), or nylon, or nylon containing glass fiber can be used. Among them, the parts for integrally molding the shaft portion 65 are preferably molded with a resin material having good slidability, for example, polyacetal. In this case, the other part does not necessarily have to be formed of POM, and may be formed of a highly rigid synthetic resin that does not have sufficient slidability.

Further, one of the link members, for example, the outer B component 64, may be provided with a lever component 72 for swinging the link member 62 so that the link member 62 can be directly driven. For example, although not shown, the link member 62 and the lever component 72 formed separately are connected by fitting a rectangular shaft portion and a concave portion and screwing, but this is particularly limited. It's not a thing. The link member 62, for example, the B component 64 and the lever component 72 may be integrally molded in advance by injection molding.

Between the A component 63 and the B component 64, a bearing bracket portion 57e of the back frame 57, which is a component constituting one pair, and a bearing bracket portion 58e of the back inner shell 58, which is a component constituting the other pair, are provided. Vacancy for each is formed around the shaft portion 65. These vacant spaces are spaces for accommodating the bearing bracket portions 57e and 58e, which are the mating parts, in a swingable (non-interfering space), and in the case of the present embodiment, except for the central connecting portion 67. I try to form an open space. At both ends of the connecting portion main body 67 in the swing direction, contact surfaces (stoppers) 67c are formed in contact with the bearing bracket portion 58e on the back frame 58 side so that the link member 62 does not swing any more. There is.

One shaft portion 65 and the recess 66 may be formed in the A component 63 and the B component 64, respectively. The shaft portion 65 may be a bottomed cylindrical shape (hollow shaft) or a solid shaft, but in the case of a completely penetrating hollow shaft, the strength is reinforced by passing a metal rotating shaft inside. Or, it may be possible to fasten the two parts on the shaft portion 65 through the fastening screw. When the shaft portion 65 itself also serves as a connecting portion, the connecting portion 67 shown in the figure may be omitted.

The link member 62 is structurally reinforced because the shaft portion 65 forming the kinematic pair has a double-sided structure consisting of the A component 63 and the B component 64. Further, since the shaft portion 65 is made of resin integrally molded with the A component 63 or the B component 64, the movement becomes smooth. Therefore, although it is a member composed only of a resin molded product, it is structurally not inferior in terms of strength. Further, since the shaft portion is made of resin integrally molded with the A component or the B component, the movement is smooth and no abnormal noise is generated. Moreover, since the iron connecting pins or shafts that make up the even number are not used, there is no need to use resin collars or bushes to ensure the generation of abnormal noise and ease of movement, so the number of parts is reduced and the number of parts is reduced. Assembling labor, man-hours, and management man-hours can be reduced, and parts cost and manufacturing cost can be reduced. In addition, since the two parts, the A part and the B part, can be butted to form one element containing the two shaft parts, the shaft part is not exposed to the outside, so that the chair looks good. Will also get better.
According to this link member, the other is in a state where the positional relationship between the bearing brackets of the two members connecting one component to each other and the two mating members constituting the link mechanism is determined by passing the shaft portion respectively. Since the parts of the above are fitted together, positioning is easy and the assembling property is remarkably improved. Further, at least only the part for integrally molding the shaft portion needs to be molded with a material having abundant slidability, and the other part does not necessarily have to be a material with abundant slidability, and the mold structure can be simplified.

Further, in the present embodiment, as shown in FIG. 2, the upper sides 57c and 58c of the back frame 57 and the back inner shell 58 are fixed by connecting the recessed portion 57g and the convex portion 58g fitted together, while the back inner shell 58 is fixed. A link mechanism 61 is formed between the lower side 58a side and the back support rod portion 57b of the back frame 57, and the entire back inner shell 58 is deformed so as to lie down or raise the backrest surface starting from the upper end 58c. However, this is not particularly limited, and in some cases, the lower side 58a side is connected to the back support rod portion 57b of the back frame 57, and the link mechanism 61 is configured on the upper sides 57c and 58c sides to form the upper side of the back inner shell 58. The 58c side may be movable in the front-rear direction with respect to the back frame 57. Further, while the upper end 58c and the lower end 58a of the back inner shell 58 are connected to the back frame 57, a link mechanism 61 is configured in the middle portion of the back inner shell 58, and the middle portion of the back inner shell 58 can be deformed back and forth. You can do it. Further, in the present embodiment, the switching by the link mechanism 61 is limited to two positions, that is, the front position and the rear position, but the switching is not particularly limited to this, and switching to three or more positions may be possible.

The back frame 57 appears on the entire surface and occupies a large weight in the design. Therefore, the color of the back frame 57 is important in the design and is a factor that greatly affects the impression of the chair. Therefore, a back frame 57 of different colors may be required to increase the product lineup. On the other hand, since the back inner shell 58 is wrapped by the total wrap 59, most of it does not appear in the appearance. Nevertheless, since only the bearing bracket portion 58e connected to the link mechanism 61 is exposed to the outside, it is necessary to align the back inner shells 58 of different colors as in the back frame 57, which is not possible. Has economic problems. Therefore, in the present embodiment, the back inner shell 58 itself is not colored (the material color is the same), and the bearing bracket portion 58e is covered with a cap 60 (see FIG. 7) having the same color as the back frame 57 so that the colors are different. The design is improved by solving the above-mentioned problems caused by the above or by covering the cap 60 with a color selected from the design point of view. That is, by covering an arbitrary color, for example, a cap 60 having the same color as the back frame 57, only the visible part is changed in color. For example, a cap 60 having an appearance as shown in FIG. 17 is placed on the bearing bracket portion 58e of the back inner shell 58, and the bearing bracket portion 57e of the back frame 57 and the A component 63 and the B component 64 of the link mechanism are placed through the cap 60. It is swingably connected to the back frame 57 by being sandwiched between the two. As a result, regardless of the color of the back frame 57, the back inner shell 58 can be made of a single color, so that the efficiency of member production can be expected and the number of parts to be managed is reduced, which can contribute to cost reduction.

The cap 60 is placed on the bearing bracket portion 58e of the back inner shell 58 to color the bearing bracket portion 58e in the same color as the back frame 57 or in a required color, and at least outside the entire case. It suffices if it covers the exposed bearing bracket portion 58e, is rotatably accommodated between the A component 63 and the B component 64 of the link mechanism 61, and has a hole through which the shaft portion 65 penetrates. In the case of the present embodiment, the cap 60 is provided with two grooves 13a and 13b for making the two grooves 75 and 76 of the hypotenuse 58b of the back inner shell 58 continuous to the lower end of the hypotenuse 58b, and a bearing bracket portion 57e. A main covering portion 14 that surrounds the cap 60, a base covering portion 15 that covers the surface of the thinner shell around the bearing bracket portion 57e, and a protrusion 16 for positioning and fixing the cap 60 to the back inner shell 58 are provided. .. On the back inner shell 58 side, a recess 17 for fitting a protrusion provided on the inner surface side of the cap 60 is formed at a corresponding position.

The back inner shell 58 is made of, for example, a synthetic resin, and as shown in FIG. 12, in front view, the back inner shell 58 has a peripheral portion serving as a back frame having an upper side 58c, a side side 58d, a hypotenuse 58b, and a lower side 58a, and a large number of vertical and horizontal portions. The slits 23a and 23b are provided on the entire surface to have a backrest surface for which flexibility is ensured. The slit is a combination of a vertical slit 23a and a horizontal slit 23b, and at a position corresponding to the vicinity of the seated person's lumbar region (lumbar support portion), it is difficult to bend (difficult to expand) in order to firmly hold the seated person's lumbar region. ) The horizontal slit 23b is formed with a vertical slit 23a that is easily bent (easily expanded) in the portion above and below the waist. In the present embodiment, for example, the thickness of the vertical band 24a for partitioning the vertical slit 23a is set to a constant thickness (basic surface) as the basic thickness, and the horizontal band 24b connecting the vertical slit 23a and the vertical slit 23a is used. The band 24b running in the lateral direction of the lateral slit 23b is slightly thicker than the basic thickness in order to increase the tension. That is, the backrest surface is basically composed of vertical slits (vertical band 24a) 23a, and the horizontal slit (horizontal band 24b) 23b portion is formed thicker than the vertical slit 23a portion. While firmly supporting the lumbar region, it has a flexible support structure that easily bends at the upper and lower parts of the back.

Further, since there are three layers of the front side upholstery 59a, the urethane cushion 59c, and the back side upholstery 59b in the seam allowance portion on the edge side (outside) of the sutured portion of the total wrap 59, when it is put on the back inner shell 58. In addition, the seam allowance portion may appear as unevenness on the back surface of the back inner shell 58. Therefore, as shown in FIG. 13, a jetty portion 73 is formed along the edge inward by a certain width from the edge on the peripheral edge portion of the side side 58d on the back surface side of the back inner shell 58, and the jetty portion 73 and the edge are formed. A step portion 74 for accommodating the seam allowance portion is formed between them. That is, the step portion 74 in which the seam allowance portion of the total walnut 59 is accommodated refers to the region from the edge of the side side of the back inner shell 58 to the jetty portion 73 formed at a position within a certain width. The jetty portion 73 is set at a height that the seam allowance portion cannot overcome, for example, at least the thickness of the seam allowance portion between the front side upholstery 59a of the total walnut 59 and the cushion, and is set to be approximately the same as or greater than the thickness of the seam allowance portion. The back side upholstery 59b is tensioned between the edge of 58 and the jetty 73, and at the same time, the seam allowance is housed in the step 74, so that the seam allowance appears as unevenness on the back side of the backrest. Care is taken not to appear in. The jetty portion 73 is formed up to the boundary between the side side of the back inner shell 58 and the hypotenuse 58b, and in the case of the present embodiment, up to the maximum width portion of the back inner shell 58.

Further, a position where the back inner shell 58 can be fixed while applying tension to the total wrapping, for example, in the case of this embodiment in which the total wrapping is covered from above, the side opposite to the upper side, that is, the lower side It is provided so that the edges and edges of the upholstery are fixed on the side. For example, as shown in FIGS. 13 and 14, the hypotenuse 58b of the back inner shell 58 and the outer surface of the bottom are fitted with the edges of the upholstery around which the thin plate-shaped locking member is wrapped. The groove 75 for inserting the edge of the front side upholstery 59a of the opening of the total walnut 59 and the back side upholstery groove 76 for inserting the edge of the back side upholstery 59b are formed side by side in the front-rear direction. In the case of the present embodiment, the edge of the front side upholstery 59a is sewn with the cushioning cushion 59c folded back together with the locking members 78 and 79 sandwiched therein, and is inserted into the front side upholstery groove 75. Has been made. From this, the groove width 75 for the front side upholstery into which the edge of the front side upholstery 59a is inserted is wider than the groove for the back side upholstery 76 in which only the upholstery and the resin cord are sewn together and the back side upholstery 59b is simply inserted. Is widely formed. Further, the front side upholstery groove 75 and the back side upholstery groove 76 are possible so as not to create a gap between the front side upholstery 59a inserted from the front and the back side upholstery 59b inserted from the back. It is preferable to arrange them side by side as close as possible to each other. For example, it is arranged through a barrier 77 having the minimum necessary thickness, and is lower than the outer wall portion (hereinafter, referred to as the front side outer wall portion 81 and the back side outer wall portion 82 of the upholstery groove) that divides both grooves. It is partitioned by a barrier 77. In this case, when the cushioning cushion of the front side upholstery 59a goes out of the barrier 77, it is released from the restraint by the barrier 77 and slightly swells and protrudes above the barrier 77, so that it comes into close contact with the back side upholstery 59b.

In the case of the present embodiment, the two stretched grooves 75 and 76 are provided on the lower side 58a of the back inner shell 58 and the hypotenuse 58b corresponding thereto, but the present invention is not particularly limited to this, and the total walnut 59 has. On the other hand, since it can be fixed as long as it can be mounted while applying tension, it can be provided at any position. For example, the upper side 58c of the back inner shell 58 or the side 58d may be used. Further, instead of using the back inner shell 58, it may be fixed by being covered with a back frame (a frame body having a hollow inside) (not shown).

Further, since the total walnut 59 of the present embodiment uses a woven upholstery that is inferior in elasticity to the upholstery of the mesh material, there is a problem that it is easier to come off than the upholstery of the mesh material. Therefore, as shown in FIGS. 15 and 16, the return projecting from the inner wall surface of the front side outer wall portion 81 and the back side outer wall portion 82 that partition the front side upholstery groove 75 and the back side upholstery groove 76 into the inner space. 83 is provided to strengthen the retaining mechanism. For example, the front side upholstery groove 75 and the back side upholstery groove 76 are provided so that the return 83 that is caught in the direction in which the locking members 78 and 79 come out protrudes at appropriate numbers, for example, two places. The return 83 is formed on a slope that gradually rises from the entrance side of the groove toward the bottom, and an undercut is formed at the tip toward the bottom side by using a slide core or the like. By hooking the end of the locking member wrapped in the upholstery on this undercut portion, it is possible to prevent the upholstery from coming off. Since the hole 84 formed by the slide core remains on the back side of the return 83, when removing the upholstery from the back inner shell 58, a finger or a jig is inserted through the hole 84 to lift the locking members 78 and 79. By overcoming the return 83, it can be easily separated from the upholstery grooves 75 and 76.

Avoid the accumulation of seam allowance at the boundary between the stepped portion 74 on the side side 58d of the back inner shell 58 and the two stretched grooves 75 and 76 on the hypotenuse 58b, that is, the portion transitioning from the side side 58d to the hypotenuse 58b. A seam allowance relief portion 85 is formed so that the front side upholstery 59a and the back side upholstery 59b are smoothly guided into the grooves 75 and 76 for the upholstery to make the sewing line look beautiful (see FIG. 16). ). The seam allowance relief portion 85 is a guide space through which the seam allowance portion is smoothly switched to the place where the locking members 78 and 79 are sewn, and the seam allowance portion housed in the step portion 74 is the locking member 78. At the portion connected to the edge portion of the upholstery 59a and 59b where the seam allowances, 79 are sewn, the seam allowance is prevented from becoming conspicuous by properly connecting the seam allowance portion to the unreasonable movement. In the case of the present embodiment, for example, it is the same as the back side outer wall portion 82 formed so that the height of the jetty portion 73 gradually increases toward the maximum width position 58f of the back inner shell 58 to partition the back side upholstery groove 76. While the height is set to be a continuous surface, the peripheral edge portion of the side side constituting the step portion 74 is connected to the front side outer wall portion 81 for partitioning the front side upholstery groove 75 to partition the upholstery grooves 75 and 76. A seam allowance relief portion 85 is formed consisting of a space (groove in which the barrier 77 does not exist) formed by extending the front side outer wall portion 81 and the back side outer wall portion 82. A gentle radius is formed in the corner portion of the back side outer wall portion 82 that can be switched from the jetty portion 73, and is provided so as to gently change when the separated back side upholstery 59b is involved.

The total wrap 59 is composed of a front side upholstery 59a that covers the front side of the back inner shell 58, a back side upholstery 59b that covers the back side, and a relatively thin urethane cushion for cushioning that is sewn on the back side of the front side upholstery 59a. And sewn into a bag shape similar to the back inner shell 58 (see FIGS. 18 and 19). Since the total walnut 59 of the present embodiment is covered from above the back inner shell 58 and fixed near the bottom, both sides and the upper side above the maximum width position are sewn together, while the maximum width position is sewn. The hypotenuse 58b and the lower side 58a below the 58f form an opening that is branched into the front side upholstery 59a and the back side upholstery 59b without being sewn. Here, both hypotenuses 58b connected to the above-mentioned lower side 58a have both components of vertical tension and width direction tension when tension is applied to the upholstery of the total walnut 59, but the total walnut 59 is mainly upward. It can be regarded as a part of the lower side 58a that works so as not to rise, that is, the side facing the upper side 58c.

The backrest 9 of the present embodiment has a skeleton composed of a rigid back frame 57 and a flexible back inner shell 58, and a convex portion (mounting portion or a mounting portion) protruding from the back side of the upper side 58c of the back inner shell 58. A screw is fitted by fitting 58 g (which constitutes either one of the attached portions) and 57 g of a recess (which constitutes either the attached portion or the attached portion) provided on the front side of the upper side 57c of the back frame 57. One end is connected by stopping. On the other hand, the back inner shell 58 is covered with a total wrap 59. Therefore, it is necessary to project the convex portion 58 g (or the convex portion having the concave portion) for attaching the back inner shell 58 to the back frame 57 from the total wrap 59. In the case of the present embodiment, the total wrap 59 is provided with a convex portion 58g at a connecting portion between the back inner shell 58 and the back frame 57, that is, on the back side of the upper side of the back inner shell 58 and at a position where the convex portion 58g protrudes. A rift is provided to penetrate. On the other hand, since tension is constantly applied to the upholstery of the total walnut 59, if a rift is provided, the rift may expand and the edge may appear meandering. Therefore, a member for exposing the attachment portion or the attachment portion of the back inner shell from the upholstery and fixing the upholstery around the attachment portion (or the attachment portion), in the case of the present embodiment, a hole 53 through which the convex portion 58g is penetrated. By sewing the plate-shaped edging member 54 having the above shape to the rim of the crevice and fixing the rim of the rift to the edging member 54, the convex portion 58 g of the back inner shell 58 from the hole 53 of the edging member 54. While popping out, the edge of the rift is fixed linearly so that it will not be disturbed. As a result, when wrapping the back inner shell 58, the convex portion 58 g of the back inner shell 58 can be easily projected from the hole 53 of the edging member 54 so that the convex portion 58 g can be easily projected, which saves time and effort for wrapping. Can be avoided. In this embodiment, an example is described in which the convex portion 58 g of the back inner shell 58 is exposed from the upholstery in the total walnut 59, but the present invention is not particularly limited to this. The backrest is composed of a back frame and a back inner shell, and one of the rear surface of the back inner shell and the front surface of the back frame is provided with a mounting portion and the other is provided with a mounting portion, and the rear surface of the back inner shell is covered with upholstery. In the backrest structure, the mounting part or the mounted part of the back inner shell is exposed from the upholstery, the mounting part and the mounted part are connected with the upholstery interposed therebetween, and the back frame and the back inner shell are connected. Needless to say, it is effective even if it is applied when it is used.

The edging member 54 may be made of a material having appropriate flexibility and strength. For example, a synthetic resin plate, a metal plate such as aluminum, paper such as thick paper or Japanese paper, or cloth in some cases can be used. Yes, preferably a synthetic resin plate, more preferably a polypropylene plate. The edging member 54 has a size that at least partitions a hole 53 that penetrates the convex portion 58g and secures an area (width and length) for sewing the edge of the crevice (edge of the upholstery) around the hole 53. It is sufficient, and it may be an individual correspondence that is arranged independently for each protrusion, but it may be a comprehensive correspondence that is composed of one plate that covers a plurality of holes 53. Comprehensive support can efficiently perform suturing work on the upholstery. In the case of the present embodiment, a thin polypropylene plate is used for the edging member 54, and the corresponding number of holes 53 corresponds to the size, position, and number of protrusions protruding outward through the total walnut. Is provided only. That is, it is composed of one plate covering the four holes 53 (see FIG. 20). In any case, it is possible to complete the terminal treatment of the upholstery by simply suturing the edge of the crevice to the edging member 54, and it is possible to save time and effort, and the finish is stable, so that the quality is also high. .. As a result, the number of defective products is reduced and the yield is increased.

The edging member 54 is sewn to the back surface side of the sewn portion of the front side upholstery 59a and the back side upholstery 59b when sewing the total wrapping 9, and is fixed to the upholstery 59a and 59b. That is, without suturing the original suture points between the front side upholstery 59a and the back side upholstery 59b (that is, a crevice 26 is provided), the edges of the front side upholstery 59a and the back side upholstery 59b are attached to the edging member 54. By sewing, the edging member 54 is arranged between the front side upholstery 59a and the back side upholstery 59b, that is, in the crevice. In the case of this embodiment, the stitching points on the upper side of the front side upholstery 59a and the back side upholstery 59b of the total walnut are closer to the back side than the position passing through the center of the top surface of the upper side of the back inner shell 58, and the back inner It is set on a line passing over four convex portions 58g protruding on the back side of the shell 58. Therefore, the edging member 54 and the sutured portion are set at a position sandwiched between the back inner shell 58 and the back frame 57 and are hidden.

In the present embodiment, since the connecting portion between the back inner shell 58 and the back frame 57 is set on the upper side of the total wrapping 59, the edging member 54 is also sewn on the upper side, but this is particularly limited. If the connecting portion is set to the side (horizontal) 58d or the lower side 58a of the back inner shell 58, it is sewn to the total wrap 59 at a position corresponding to them. Further, in the present embodiment, a woven upholstery / fabric is used as the total walnut 59, but the present invention is not particularly limited to this, and for example, an upholstery made of a highly elastic mesh material may be used. good. That is, the backrest surface may be formed by a flexible back frame (a frame having only an edge with an empty space inside) and a total wrap made of a mesh. Further, in the present embodiment, the edging member 54 includes the front side upholstery 59a and the back side upholstery 59b set on the line passing over the four convex portions 58g protruding on the back side of the back inner shell 58. It is sewn using the sewn part of the above, but it is not particularly limited to this, and a notch is made in the upholstery as necessary at a place other than the sewn part to provide a slit, and the edging member 54 is sewn to the slit. You may do so.

Further, the rift / hole edging structure of the present embodiment is not limited to the case where it is applied to a crevice in which a convex portion 58 g for connecting the back inner shell 58 and the back frame 57 is projected, and is not limited to a total wrapping. Needless to say, it can be applied to fix the edge of the upholstery to project other protrusions protruding from 9, for example, the bearing bracket portion 58e of the back inner shell 58.

As the upholstery fixing structure of the total walnut 59 in the present embodiment, a groove (groove for upholstery) into which the edge of the upholstery is inserted is provided on the back inner shell 58 side, and a thin plate-shaped locking member is provided in the upholstery groove. A structure is adopted in which the edges of the rolled-up upholstery are fitted and fixed. In this upholstery fixing structure, a plate-shaped locking member is sewn on the edge of the upholstery, and the edge of the upholstery is folded back together with this locking member and fitted into the upholstery groove of the back inner shell 58. As a result, even if a tensile force is applied to the upholstery, the locking member is caught in the upholstery groove and is prevented from coming out of the upholstery groove. For example, as shown in FIG. 21, the locking members 78 and 79 having a width dimension longer than the thickness dimension and having a certain degree of flexibility and rigidity are provided at the respective edges of the front side upholstery 59a and the back side upholstery 59b. By folding back the peripheral edge of the upholstery together with the locking members 78 and 79, two rows parallel to the body support surface and the backrest surface formed on the outer surfaces of the hypotenuse 58b and the lower side 58a of the back inner shell 58. By pushing into the upholstery grooves 75 and 76, respectively, it is possible to fix the front side upholstery 59a and the back upholstery 59b of the total wrap 9 covering the back inner shell 58 while giving tension. The locking members 78 and 79 are made of a material having a hardness that does not easily bend due to the tension applied to the upholstery 5 and having plasticity that bends along the groove shape, such as a thermoplastic resin or iron. , Aluminum alloy, copper and other malleable metal thin plates are preferably used, and among them, a resin cord (also simply referred to as a resin cord) that is generally commercially available, relatively inexpensive, and easy to use is preferable. In the present embodiment, as the locking members 78 and 79, a resin cord made of a synthetic resin having a predetermined hardness, for example, polypropylene or the like is used.

Here, in the total walnut 59 in which the front and rear of the backrest 9 are wrapped with upholstery, the edges of the front upholstery 59a and the back upholstery 59b sewn with the locking members 78 and 79 from the front and back of the back inner shell 58 are folded back and stretched. It needs to be inserted into the ground ditch. At this time, if the locking structure is such that the front side upholstery 59a and the back side upholstery 59b are inserted into one upholstery groove at the same time, the groove width becomes large and it becomes easy to come off, so that the quality deteriorates. For this reason, the front side upholstery groove 75 and the back side upholstery groove 76 are divided into two grooves and provided separately so that the edge of one upholstery is inserted into one upholstery groove. We are trying to obtain a locking structure that is difficult to pull out and is stable in quality. However, when the two grooves 75 and 76 are provided separately so as to be completely separated as independent entities, the surface of the back inner shell 58 between the two grooves 75 and 76 is exposed to the outside. This causes the problem that it may not be liked in terms of design. Therefore, in the present embodiment, two grooves, the front side upholstery groove 75 and the back side upholstery groove 76, are arranged so as to be arranged through the barrier 77 having the minimum necessary thickness, and the upholstery is provided for each of the two grooves. The surface of the back inner shell 58 is not exposed between the front side upholstery 59a and the back side upholstery 59b. However, even in this case, the front side upholstery 59a and the back side upholstery 59b are pulled in opposite directions to apply tension, and in some cases, the top surface of the barrier 77 may be exposed.

Therefore, in order to more reliably prevent the top surface of the barrier 77 from being exposed, the upholstery is placed on either the locking member 78 of the front side upholstery 59a or the locking member 79 of the back side upholstery 59b. It is preferable to provide a bulging portion 80 projecting above the top surface of the above. For example, in the present embodiment, one of the locking members, for example, in the case of the present embodiment, the locking member 79 sewn to the backside upholstery 59b has a bulging portion 80 protruding in a direction opposite to the upholstery of the stitching partner. When fitted into the backside upholstery groove 76, the upholstery 59b is projected onto the top surface of the barrier 77 to shield it. The locking member 79 having the bulging portion 80 may be, for example, a locking member having a cross-sectional shape of L, P, F, or a flag having triangular protrusions, and an L-shaped having a simple shape. It is preferable to use a resin cord. Then, if the L-shaped locking member 79 is sewn to the upholstery so that the bulging portion 80 protruding laterally is arranged on the edge side of the upholstery, the locking member 79 is wrapped in the upholstery. When it is folded back and then inserted into the groove, the upholstery can be inflated by the portion of the L-shaped bulging portion 80 to cover the top surface portion of the barrier 77. In the case of the present embodiment, the integrally molded L-shaped locking member 79 is used, but the present invention is not particularly limited to this, and the base portion sewn along the surface of the upholstery is stretched. It suffices to have a bulging portion 80 that protrudes in the direction opposite to the ground, and the bulging portion 80 may be formed integrally with the base portion, or may be attached with another part by adhesive or the like. ..

On the other hand, in the case of the present embodiment, the front side upholstery 59a around which the cushioning cushion 59c is wound together has a plate-shaped locking member 78 having no bulge 80, that is, a simple plate-shaped locking member 78. It is sewn (note that the mere plate-shaped locking member 78 can be positioned as a "second locking member" with respect to the locking member having the bulge 80). In order to inflate the upholstery and cover the top surface portion of the barrier 77, it is sufficient that at least one of the locking members has the bulging portion 80. Further, since the front side upholstery 59a around which the cushioning cushion 59c is involved exhibits a certain degree of elasticity, it is difficult to form a gap between the front side upholstery 59a and the barrier 77 when it is inserted into the front side upholstery groove 75. When the backside upholstery 59b around which one of the locking members 79 having the bulging portion 80 is involved is projected and pressed on the top surface portion of the barrier 77, it elastically deforms and adheres to form a linear dividing line. Can be made. Therefore, in the case of the present embodiment, the bulging portion 80 is not required for the locking member 78 of the front side upholstery 59a, but the bulging portion 80 may be provided in some cases. In this case, both the front side upholstery 59a and the back side upholstery 59b project over the top surface of the barrier 77 and are pressed against each other to be in close contact with each other, and a linear division is made between the front side upholstery 59a and the back side upholstery 59b. You can make a line.

Here, in the fixed structure of the upholstery according to the present invention, two grooves 75, 76 are formed as in the above-described embodiment, and the total walnut 59 (59a, 59a, 59b) is not limited to the mode in which the two ends are inserted. Specifically, for example, as shown in FIG. 30, only one groove 75'is formed in the member to which the upholstery 59a'is attached, and the end of the upholstery 59a' stretched to the member. A locking member 79 is attached to one of them (in other words, one side), and the fitting portion 79a and the bulging portion exposed to the outside of the groove 75'where the locking member 79 is fitted into the groove 75'. The locking member 79 is formed as having 80, and is inserted into the groove 75'together with the fitting portion 79a while the upholstery 59a'is caught by the locking member 79 and is wrapped around the locking member 79. The bulging portion 79a may cover one of the opposing walls 77'and 81 forming the groove 75'.

In the case of the present embodiment, the headrest 86 includes a flexible headrest inner shell 87, a stretched material of the total wrapping (hereinafter, referred to as a headrest total wrapping 88) over the flexible headrest inner shell 87, and a headrest. It is composed of a headrest core 89 filled inside the inner shell 87 and a grip 90 having a claw that engages with a groove and a recess (not shown) formed on the upper side 57c of the back frame 57 and holds the upper side 57c. It is detachably attached to the upper side 57c of the frame 57. A cushioning material 88c such as urethane interposed between the headrest inner shell 87 and the headrest surface is sewn on the back side of the front side upholstery 88a of the headrest total wrapping 88. Since the headrest total wrapping 88 of the present embodiment is covered from the top of the headrest inner shell 87 and the lower end edge is folded back and fixed to the inside of the skirt portion 91 at the bottom, it is sewn on the upper side and both sides. The lower edge is opened without being sewn.

The headrest inner shell 87 is not limited to a specific shape, but in the case of the present embodiment, as shown in FIGS. 22 and 23, for example, the headrest inner shell 87 is curved so as to be convex in the front-rear direction and concave in the left-right direction. It forms a double-curved paraboloid, and is covered with a bag-shaped headrest total walnut 88. The headrest inner shell 87 is provided with a vertical slit 92 for facilitating bending in the front-rear direction, and the outer circumference thereof is thicker than the center to have rigidity.

In the case of the headrest total wrapping 88 in which the front and rear of the headrest inner shell 87 are wrapped with upholstery, the edge of the upholstery to which the locking member 94 (similar to the above-mentioned locking member 78) is sewn from the front and rear of the headrest inner shell 87. Need to be inserted and fixed. Therefore, a skirt portion 91 that expands in the rear direction is formed at the bottom of the headrest inner shell 87, and the front side edge portion 93a to which the front side upholstery 88a of the headrest total wrapping 88 is attached and the rear side edge portion 93b to which the back side upholstery 88b is attached. Is configured (see FIG. 23). Further, on each inner surface of the front side edge portion 93a and the rear surface side edge portion 93b, a tension groove 96 for inserting and fixing the edge of the tension material on which the locking member 94 is sewn is provided (FIG. 25). reference). Here, the front side edge portion 93a and the rear surface side edge portion 93b of the above-mentioned skirt portion 91 include slightly inclined hypotenuse portions on both the left and right sides, but tension in the vertical direction is applied when tension is applied to the upholstery. Can be regarded as a part of the bottom that works so that the walnut does not slide upward.

Further, the headrest inner shell 87 is provided with a detachable headrest core 89 that is fitted into the space inside the skirt portion 91. As shown in FIG. 24, the headrest core 89 is provided on a bottom lid portion 89a that closes the bottom opening of the skirt portion 91 of the headrest inner shell 87 and an inner surface thereof (a surface facing the inside of the skirt portion 91). Between the support portion 89b that is addressed to and supports the inner surfaces of the front side edge portion 93a and the rear surface side edge portion 93b of the skirt portion 91 and the pair of front and rear pressing portions 97a and 97b integrally formed with the ribs in the skirt portion 91. 89c that is fitted into the space 95 of the headrest inner shell 87, a tubular portion 89d that supports fastening screws that are screwed into female screws provided near both ends in the left-right direction of the headrest inner shell 87, and a front side of the skirt portion 91 of the headrest inner shell 87. A spring portion 89e that overcomes the rib connecting the edge portion 93a and the rear surface side edge portion 93b and engages with the rib, and a front wall portion 93f that is addressed to the front side edge portion 93a are provided. The headrest core 89 is fixed by being fitted into the space inside the skirt portion 91 of the headrest inner shell 87 and screwed to the female screw portion 27, and is integrated with the headrest inner shell 87. At the same time, since the opening of the skirt portion 91 is closed by the headrest core 89, the upholstery groove 96 and the return 98 formed inside the skirt portion 91 are shielded, and the terminal processing status of the upholstery appears in the appearance. Absent.

As shown in FIG. 22, the grip 90 includes, for example, a lower jaw portion 90a having a claw that is fitted into a recess (not shown) formed on the lower surface of the upper side 57c of the back frame 57 so as to be addressed from below. It is composed of an upper jaw portion 90b having a claw that is fitted so as to be hooked on a groove (not shown) formed on the upper surface of the upper side 57c, and these are arranged so as to sandwich the upper side 57c of the back frame 57 and then bolted (not shown). By connecting to each other with (omitted), the upper side 57c is gripped and fixed. Further, the upper jaw portion 90b is connected and integrated with the headrest inner shell 87 via the headrest core 89 to support the headrest inner shell 87.

In the case of the present embodiment, the upholstery groove 96 is a clip-shaped groove formed intermittently on the inner surfaces of the front side edge portion 93a and the rear surface side edge portion 93b of the skirt portion 91, as shown in FIG. As a result, a return (reverse hook, reverse stab) 98 is provided at a plurality of locations, for example, five locations, and is hooked on the end of the locking member 94 to prevent its movement at a portion corresponding to the entrance.

In the case of the present embodiment, as shown in FIG. 25, the upholstery groove 96 is located between the front holding portion 97a and the front side edge portion 93a of the skirt portion 91, and the rear holding portion 97b and the rear side side edge portion 93b. Each is composed of. Here, the front pressing portion 97a and the rear pressing portion 97b are formed with a substantially uniform distance and gap between the front side edge portion 93a of the skirt portion 91 and the inner surface of the rear surface side edge portion 93b. In the case of the present embodiment, the cantilever beam shape protruding from the rib 97 connecting the front side edge portion 93a and the rear surface side edge portion 93b of the skirt portion 91 toward the opening of the skirt portion 91. It is integrally molded with. Reference numeral 97'is also a rib that connects and reinforces the front side edge portion 93a and the rear surface side edge portion 93b.

Further, the return 98 is a protrusion protruding from the inner surfaces of the front side edge portion 93a and the rear surface side edge portion 93b in a direction intersecting the pulling direction of the upholstery and the locking member 94, and is the case of the present embodiment. For example, it has a locking surface (per degree) 98a facing the end surface of the locking member 94 housed in the upholstery groove 96, and gradually toward the opening of the skirt portion 91 with the vicinity of the locking surface 98a as the apex. It forms a wedge shape with a lowered inclined surface 98b, and when the headrest inner shell 87 is injection-molded, an undercut of the locking surface 98a portion is formed by using a slide core. The return 98 may be continuously formed over the entire width of the front side edge portion 93a and the rear surface side edge portion 93b, but it is better to form the return 98 intermittently as in the present embodiment by using the slide core. Is preferable because it can be easily molded.

In the case of the present embodiment, the locking surface 98a of the return 98 is a slightly backward inclined slope (front side edge portion 93a side) formed on an extension of the edge surface of the hole 99 formed by the slide core during injection molding. ) Or a reversely inclined slope (rear surface side edge portion 93b side) that protrudes toward the end surface of the locking member 94. In the case of the present embodiment, the backup portion 89c is provided so that the gap between the front pressing portion 97a and the rear pressing portion 97b and the return 98 does not widen, so that the locking surface 98a is engaged in a strict sense. It does not have to be a surface parallel to the end surface of the stopping member (a vertical surface orthogonal to the locking member). Of course, if the slope is a reverse slope protruding toward the end surface of the locking member 94 or a surface parallel to the end surface of the locking member (a vertical surface orthogonal to the locking member), the front pressing portion 97a and the rear pressing portion 97a Even if the back of the 97b is not supported by the backup portion 89c, it is possible to prevent the locking member 94 from moving in the disconnecting direction simply by pressing the end surface of the locking member 94 against the locking surface 98a.

Further, from the apex of the return 98 of the surface 25 facing the front side edge portion 93a of the front pressing portion 97a, the tip portion 25a on the opening side of the skirt portion 91 is formed on a slope inclined to the opposite side to the slope 98b of the return 98. ing. That is, the gap (entrance of the upholstery groove) formed between the inclined surface 25a of the front pressing portion 97a and the inclined surface 98b of the return 98 is a tapered surface that widens toward the outside, and is a locking member. It is configured to serve as a guide to assist in introduction when inserting the edge of the upholstery with the 94 sewn. The relationship between the return 98 of the rear side edge portion 93b of the skirt portion 91 and the rear side pressing portion 97b is the same, and detailed description thereof will be omitted.

Behind the front pressing portion 97a and the rear pressing portion 97b, in the case of the present embodiment, that is, between the front pressing portion 97a and the rear pressing portion 97b, the front pressing portion 97a and the rear pressing portion 97b are returned. A space for elastically deforming in the direction of expanding the gap between the spaces, for example, a wedge-shaped space 95 in which at least one of them is formed into an inclined surface is formed. On the other hand, on the headrest core 89 side, a backup portion 89c is provided which fills the above-mentioned space 95 and prevents elastic deformation in the direction of widening the gap between the front pressing portion 97a and the rear pressing portion 97b and the return 98. ing. Here, the space 95 between the backup portion 89c and the front pressing portion 97a and the rear pressing portion 97b is preferably a wedge shape that can be fitted without a gap, but is not particularly limited to this wedge shape and is tapered. Or a recess having a gradient of 0 may be formed, or in some cases, the space on the front side pressing portion 97a side and the space on the rear side pressing portion 97b side may be formed as independent and separate spaces.

In the locking structure at the end of the upholstery, when the edges of the upholstery 88a and 88b to which the locking member 94 is sewn are inserted as they are without winding one, the locking member 94 is easily pulled out, so that the upholstery groove 96 It is desirable to narrow the groove width. However, even if the groove width is narrowed or the pressing force of the pressing portions 97a and 97b is increased, the locking member 94 sewn on the edges of the upholstery 88a and 88b is pulled out so as to be translated. In this case, since the upholstery 88a and 88b are interposed, slippage is likely to occur, and it is difficult to completely prevent the pulling out. Therefore, in the present embodiment, the holding portions 97a and 97b are prevented from being deformed to the back side after the upholstery 88a and 88b in which the locking member 94 is sewn into the upholstery groove are inserted, and the return 98 is engaged. By hooking and pressing the end of the stop member 94, it is prevented from being easily pulled out.

Therefore, in the case of the locking structure of the stretched end portion of the present embodiment, when the edges of the stretched fabrics 88a and 88b are inserted, the front pressing portion 97a and the rear pressing portion 97b expand the groove width (the locking member 94. Since it can bend in the thickness direction), it can be easily passed through the portion of the barb 98 and inserted into the upholstery groove 96. Then, after inserting the edge of the upholstery with the locking member 94 sewn into the upholstery groove 96, the headrest core 89 is fixed to the skirt portion 91 of the headrest inner shell 87, whereby the front holding portion 97a and the rear are reared. The backup portion 89c is fitted into the space 95 between the side pressing portion 97b, and the front pressing portion 97a and the rear pressing portion 97b are returned to their original positions, or the groove width is widened from the original position (front side). Deformation in the direction away from the edge portion 93a or the rear surface side edge portion 93b: inward) is prevented (see FIG. 26). As a result, it is prevented that the end of the locking member 94 hits the locking surface 98a of the return 98 and is separated from the upholstery groove 96, so that the upholstery does not easily come out. Further, when removing the upholstery 88a and 88b for replacement or the like, the headrest core 89 is removed to form the undercore of the return 98 formed on the front side edge portion 93a and the rear surface side edge portion 93b. If a finger or a jig is inserted through the through hole 99 of the slide core and the locking member 94 is pushed up toward the front holding portion 97a or the rear holding portion 97b and the upholstery 88a and 88b are pulled out, it is easy to overcome the return 98. Can be pulled out to.

In the present embodiment, the cantilever-shaped front pressing portion 97a and the rear pressing portion 97b are formed by using the rib 97 that connects the front side edge portion 93a and the rear surface side edge portion 93b of the skirt portion 91. It is integrally formed so as to form a clip-shaped upholstery groove 96 between the front side edge portion 93a and the rear surface side edge portion 93b, but in some cases, the front side and rear side pressers are formed. The portions 97a and 97b are formed as a wall continuous in the width direction of the skirt portion 91, and the upholstery groove is continuously stretched over the entire width between the front side edge portion 93a and the rear surface side edge portion 93b. It may be configured.

Further, in the present embodiment, the front and rear pressing portions 97a and 97b have a direction of widening the gap between the pressing portions 97a and 97b and the return 98 when inserting the edges of the upholstery 88a and 88b to which the locking member 94 is sewn. It has a cantilever-like shape to enable elastic deformation, but it is not particularly limited to this. For example, the front pressing portion 97a and the rear pressing portion 97b may be formed as one piece to form a part of the rib 97, and may be configured as a member that is not easily deformed. In this case, when inserting the edge of the upholstery with the locking member 94 sewn, the top of the barb 98 is pushed to overcome the front edge 93a side of the skirt portion 91 while elastically deforming the upholstery. It is inserted into the groove 96. Then, when the upholstery is about to be pulled out, the end of the locking member 94 is caught on the locking surface 98a of the return 98 and the movement is prevented, so that the upholstery is not pulled out. In the case of this embodiment, a separate part for suppressing deformation of the front and rear pressing portions 97a and 97b, that is, a backup portion 89c is not required.

The fixed structure of the end of the upholstery according to the above-described embodiment has been described by taking as an example the case where it is applied to a headrest, but the present invention is not particularly limited to this, and other body support structures of the chair, for example, the back. Needless to say, it can also be applied as a locking structure for the end of the upholstery in a recumbent, seat or armrest. Further, in the present embodiment, the case where it is applied to a bag-shaped upholstery, that is, a total wrapping is given as an example, but the present invention is not particularly limited to this, and one planar (two-dimensional) upholstery is fixed to the frame. It is also applicable when fixing a highly elastic mesh upholstery to the frame instead of a cloth upholstery. Further, the insertion and fixing position of the upholstery end portion of the headrest total wrapping is fixed inside the skirt portion 91 which is hard to appear in the appearance in the above embodiment, but it is not particularly limited to this and is necessary. Depending on the situation, it may be fixed to any of the side surface, the bottom surface, and the top surface of the headrest inner shell 87 or the frame.

Further, in the case of the present embodiment, the edge of the upholstery with the locking member 94 sewn is stretched as it is without folding back the edge of the headrest total wrapping 88 so as to wrap the locking member 94 with the upholstery. Although it is inserted into the ground groove 96, it is not particularly limited to this, and if it is about a half-circle winding in which the upholstery 88a and 88b are not caught between the edge of the locking member 94 and the return 98. Even if the locking member 94 is wrapped around the upholstery 88a and 88b, it does not become slippery, so it can be carried out.

Further, in the present embodiment, the upholstery made of woven fabric is used as the total walnut 88, but the present invention is not particularly limited to this, and for example, an upholstery made of a mesh material having a high elasticity may be used. That is, the headrest surface is composed of a flexible headrest frame (a frame having only an edge with an empty space inside) and a bag-shaped mesh upholstery made of a mesh that is stretched after being covered with the headrest frame. You may do so. Also in this case, the front side upholstery 88a and the back side upholstery of the bag-shaped mesh upholstery are inserted into the grooves of the skirt portion 91 at the bottom of the headrest frame and then fixed.

As shown in FIG. 27, the leg body 1 that supports the backrest, the seat, and the like described above has a leg blade type leg base 2 and a pedestal 3 that stands at the center of the leg base 2. The leg base 2 has a base 10 into which a pedestal 3 supporting a seat is fitted and a plurality of leg blades 20 having casters 4 at the tip, and is integrally molded of resin, for example, nylon containing glass fiber. Has been done. A circular through hole 11 is provided in the base portion 10 in the vertical direction, and a pedestal 3 formed of a lock type gas spring is fitted and fixed to the through hole 11. The parts constituting the pedestal 3, for example, the cylinder 18 of the gas spring, have an upper cylindrical portion 18A having a constant outer diameter and a lower cylindrical portion 18B having a constant outer diameter smaller than the outer diameter of the upper cylindrical portion 18A. And an intermediate tapered portion 18C that connects the upper cylindrical portion 18A and the lower cylindrical portion 18B without a step.

Here, in the present embodiment, the through holes 11 are the upper end side portion 11a and the lower end side portion 11b that do not come into contact with the outer peripheral surface of the pedestal 3 and do not contribute to the fixing of the pedestal 3 as shown in FIG. 28. , It is roughly divided into three regions with the pedestal support cylinder portion 12 involved in the support of the pedestal 3, and further, the pair of upper and lower contact portions 12A and 12B in which the pedestal support cylinder portion 12 contacts the outer peripheral surface of the pedestal 3. , A non-contact portion 12C that does not come into contact with the outer peripheral surface of the pedestal 3 is provided between the pair of upper and lower contact portions 12A and 12B.

The upper contact portion 12A and the lower contact portion 12B form, for example, a part of one conical surface / inner peripheral surface whose inner diameter gradually decreases from the upper side to the lower side, and the intermediate tapered portion 18C of the cylinder 18 of the gas spring. It is provided so as to contact and fit at the same time. Further, the non-contact portion 12C comes into contact with the intermediate tapered portion 18C of the cylinder 18 by forming a surface that is recessed with respect to the generatrix F of the upper and lower contact portions 12A and 12B, that is, is located at a position on the outer side in the radial direction. It is formed so that it never happens. For example, as a tapered surface, a reverse tapered surface, or a cylindrical surface in which there is no step between them at the transition from the upper contact portion 12A or the lower contact portion 12B to the non-contact portion 12C and the inclination angle is continuously changed, or not. It is formed as a tapered surface, a reverse tapered surface, or a cylindrical surface that transitions continuously and stepwise. In the case of the present embodiment, as shown in FIG. 8, the tapered surface (θ2 <θ1) whose diameter is expanded outward in the radial direction from the lower end of the upper contact portion 12A toward the lower contact portion 12B is used. Although not shown depending on the case, a tapered surface (θ1 <θ2) whose diameter is expanded outward in the radial direction from the upper end of the lower contact portion 12B to the upper contact portion 12A may be used. In either case, the die can be easily molded. Further, in some cases, the inclination angle θ2 of the non-contact portion 12C is the same as the inclination angle θ1 of the upper and lower contact portions 12A and 12B, and the inner diameter is expanded outward in the radial direction by a tapered surface (θ2 = θ1). Is also good. In short, the non-contact portion 12C does not need to protrude inward in the radial direction from the bus F and may be recessed, and may not need to be a tapered surface in some cases. The inclination angle of the bus F with respect to the vertical axis V is θ1, and the inclination angle of the non-contact portion 12C with respect to the vertical axis V is θ2. Further, the upper contact portion 12A and the lower contact portion 12B do not necessarily have to be tapered surfaces, and one or both of them are formed as circular inner peripheral surfaces concentric with the vertical axis, and these inner peripheral surfaces are cylinders. The straight line connecting the two points between the upper contact portion 12A and the lower contact portion 12B, which are in contact with the intermediate tapered portion 18C at the same time, may have the same inclination as the bus F described above.

Here, the above-mentioned inclination angles θ1 and θ2 are considered to be 2.5 ° ≤ θ1 ≤ 3.5 ° and 1.0 ° ≤ θ2 ≤ 2.0 ° as an example, and are more specific. Therefore, it is conceivable that θ1 = 3.0 ° and θ2 = 1.5 °.

According to the leg base having such a configuration, the undulations and distortions of the inner peripheral surface of the pedestal support cylinder portion 12 and the variation in the diameters of the parts constituting the pedestal 3 are absorbed by the non-contact portion 12C, whereby the upper and lower pairs are paired. The contact portions 12A and 12B can be reliably brought into close contact with the outer peripheral surface of the cylinder 18 of the gas spring as the pedestal 3, and the base portion 10 which is the attachment portion between the pedestal 3 of the chair and the resin leg base 2 penetrates. It becomes possible to prevent rattling in the hole 11. Therefore, it is not necessary to correct the variation between individuals that occurs in molding, and therefore, the work of correcting in the manufacturing process is not required, and the labor required for manufacturing can be reduced.

In the present embodiment, the leg blade 20 has a pair of side plates 21 and 21 extending in the longitudinal direction and provided facing each other, and a top portion 22 provided so as to connect the upper ends of the side plates 21 and 21. It is formed as a chevron structure with a cross-sectional shape that opens downward. The side plate 21 of the leg blade 20 is configured such that the lower portion 21B is thicker than the upper portion 21A. For example, as shown in FIG. 29, the upper portion 21A of the side plate 21 has a constant thickness dimension at t1, and the thickness dimensions t2 and t3 of the lower portion 21B of the side plate 21 are the thickness dimensions of the upper portion 21A. It is configured as greater than t1. However, the thickness dimensions of the upper portion 21A and the lower portion 21B of the side plate 21 may be constant, or may be changed so as to gradually become thicker according to the load toward the lower end.

In the case of the present embodiment, the above-mentioned thickness dimensions are, for example, t1 = about 4.0 to 5.5 mm, t2 = about 6.5 to 8.0 mm, and t3 = 4.5 to 6 as an example. It is about 0.0 mm, preferably constant at t1 = 4.5 mm, set in the range of t2 = 7.0 to 7.6 mm, t3 = 5.0 to 5.7 mm, and more preferably t1 =. It is conceivable that 4.5 mm, t2 = 7.6 mm, and t3 = 5.7 mm.

When the above-mentioned thickness dimensions t1, t2, and t3 are set, the length dimension of the leg blade 20 (the dimension from the center of the through hole 11 to the center of the support shaft of the caster 4 or the position of the center of gravity of the ground contact portion) is 330 mm or more. It has been confirmed in experiments by the present inventors that stress concentration can be avoided, design strength can be ensured, and appropriate load sharing can be satisfactorily achieved even if the thickness is about 345 mm. Moreover, this good result was achieved so that the length dimension of the leg blade 20 was about 360 mm. Moreover, the overall width dimension W in the cross section of the leg blade 20 can be reduced to about 35 mm or less, which is equivalent to the overall width dimension of the resin leg blade that has been widely used in the past.

The boundary position between the upper portion 21A and the lower portion 21B (which specifies the ratio of the upper portion 21A to the lower portion 21B in the vertical direction of the side plate 21) is limited to a specific position. Instead, avoid local stress concentration in the leg blades 20 when a load is applied to the leg base 2 by seating, secure the design strength required for the leg blades, and ensure the design strength required for the leg blades 20 and the longitudinal direction of the leg blades 20. The load is appropriately set at an appropriate position in consideration of the appropriate sharing of the load over the entire vertical cross section in the direction orthogonal to the above. Specifically, for example, the ratio of the lower portion 21B to the overall dimensions of the side plate 21 in the vertical direction is preferably set in the range of about 30 to 70%, and is set in the range of about 40 to 60%. Is even more preferable.

According to the leg base having the above configuration, the load applied to the leg base 2 is appropriately shared by the entire leg blades 20, specifically, the entire vertical cross section in the direction orthogonal to the longitudinal direction of the leg blades 20. It is possible to increase the longitudinal dimension of the resin leg blade 20 without providing a large number of side ribs or increasing the external dimension of the leg blade 20 (in other words, thickening the entire leg blade 20). Becomes possible. Therefore, it is possible to secure the strength without extremely increasing the weight or impairing the appearance while increasing the lengthwise dimension of the resin leg blades.

Although the above-described embodiment is an example of a suitable mode for carrying out the present invention, the embodiment of the present invention is not limited to the above-mentioned one, and the present invention is not limited to the above-mentioned embodiment and does not deviate from the gist of the present invention. The invention can be modified in various ways. For example, in each of the above-described embodiments, the present invention has been mainly described with reference to an example in which the present invention is applied to the backrest and the fixing of the bag-shaped upholstery at the lower end of the headrest, but the present invention is not particularly limited thereto. It may be used for fixing the backrest to the side or above. It can also be applied to the fixation of upholstery other than the backrest, such as a seat or armrest.

Further, in each of the above-described embodiments, as a method of fixing the locking members 78, 79, 94 and the edging member 54 to the upholstery, and fixing the upholstery to each other, it is an inexpensive and reliable general method. An example of using suture is given, but the present invention is not particularly limited to this, and it goes without saying that a method such as adhesion or fusion may be used if necessary.

9 Back leaning 26 Back crevice (opening)
53 holes (of edging member)
54 Edge stopper 57 Back frame 57g Back frame recess 58 Back inner shell 58a Lower side 58b Hypotenuse 58c Upper side 58d Side side 58e Bearing bracket
58f Maximum width 58g Convex 59 Total walnut 59a Front upholstery 59b Rear upholstery 59c Cushion for cushioning 59a'Upholstery 75 Front upholstery groove 75'Upholstery groove 76 Back upholstery groove 77 Barrier 77' Wall 78 Locking member (I type)
79 Locking member (L type)
79a Locking member fitting part 80 bulging part 81 front side outer wall part (groove for upholstery)
82 Back side outer wall (groove for upholstery)
86 Headrest 87 Headrest inner shell (upholstery fixing member to which upholstery is attached)
88 Headrest total walnut 89 Headrest core 89c Backup part (provided on the headrest core)
91 Skirt part 93a Front side edge part of the skirt part (one of the walls that divides the upholstery groove)
93b Rear side edge of the skirt (one of the walls that separates the upholstery groove)
94 Locking member 95 Space for the backup part to fit 96 Groove for upholstery 97a Front holding part (the other side of the wall surface that divides the groove for upholstery)
97b Rear retainer (the other side of the wall that separates the upholstery groove)
98 return

Claims (4)

The upholstery fixing member to which the upholstery is attached is provided with a upholstery groove for inserting the edge of the upholstery provided with a plate-shaped locking member at the edge, and is used for the upholstery at the entrance portion of the upholstery groove. A barb that comes into contact with the end of the locking member is provided on at least one surface of the wall surface that partitions the groove, and a holding portion is provided on the other surface.
The holding portion has flexibility that can be deformed at least in a direction that widens the distance between the holding portion and the return, and the end portion of the locking member inserted into the upholstery groove is caught in the return. Further, a backup unit is further provided, which abuts on the pressing portion at a position opposite to the return and prevents deformation of the pressing portion in the direction of widening the distance between the pressing portion and the return.
The edge of the upholstery passes between the return and the holding portion and is inserted into the upholstery groove, and after being inserted, the end of the locking member is caught by the return and the locking is performed. An upholstery locking structure, characterized in that movement in a direction in which a member is pulled out of the upholstery groove is prevented. The combination of the return portion and the pressing portion is provided so as to face each other so that the respective pressing portions are on the inside, and one backup portion is fitted between the pressing portions, whereby each of the combination is provided. coated cloth of the locking structure according to claim 1, wherein said one backup unit for both the pressing portion prevents contact with the deformation of both the each of the pressing portion of the combination at the same time. A headrest comprising the upholstery locking structure according to claim 1 or 2. A chair comprising the upholstery locking structure according to claim 1 or 2.

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