JP2020146590A - Backrest of chair - Google Patents

Abstract

To provide a cushion-type backrest enabling compactification and facilitating specifications change into a mesh type.SOLUTION: A backrest 3 includes a back frame 41 opened to the front and back, and a back plate 85 attached thereto. The back plate 85 has a body part 90 entering into a space enclosed by the back frame 41, and a member 86 of an edge part overlapped with the front face of the back frame 41, and has a shallow tray-shaped external appearance as a whole. A main cushion material 91a is fitted into the body part 90. Consequently, regardless of including the back frame, the backrest is thinned and compact as a whole. The specifications thereof can be changed into a mesh type by using the back frame 41 in common.SELECTED DRAWING: Figure 13

Description

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

For example, in the backrest of a chair, as a method of giving cushioning property, roughly, a cushion type in which a cushioning material is arranged in front of the back plate (back inner shell) or the backrest is used as a peripheral frame body with front and rear openings. It is adopted to be a mesh type with a mesh material.

As a structure using the former cushioning material, in Patent Document 1, a back plate (back inner shell) is provided, and bank-shaped walls are provided on the left and right side portions and the lower end portion of the peripheral edge, whereby a large area is provided on the back plate. A configuration is disclosed in which a recess is formed and a cushioning material is arranged in the recess. Therefore, in Patent Document 1, the back plate is roughly in the shape of a shallow tray.

Japanese Patent No. 5676241

In Patent Document 1, since the cushion material is arranged in a concave portion of the back plate so as not to be displaced, the cushion material has excellent shape retention and has advantages such as being able to maintain a sharp contour on the backrest. Further, although the cushion material is covered with the skin material, in Patent Document 1, since the cushion material is accurately positioned, there is an advantage that the skin material can be easily attached regardless of the cushion material.

On the other hand, in chairs, cushion-type backrests and mesh-type backrests may be available as variations of the same model, and in this case, they are often designed as separate structures in the past. However, this causes a problem that it is difficult to control the cost because the members cannot be standardized, and a problem that the standardization of the appearance (especially the standardization when viewed from the back) is not always sufficient.

Further, even if it is viewed only as a cushion type, for example, if a part of the backrest is damaged, the whole backrest must be replaced, and it is not economical because it cannot be partially replaced.

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

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

Of these, the body support of the invention of claim 1 has a peripheral frame body opened on the front and back sides and a body pressure receiving plate attached to the peripheral frame body, and the body pressure receiving plate is the peripheral frame. It has an edge portion that overlaps the surface of the body and a main body portion that has entered the space surrounded by the peripheral frame body, so that the main body portion fits within the thickness of the peripheral frame body in the front-rear direction. It has a shallow tray-like shape, and has a structure in which a cushioning material is fitted into the main body.

The peripheral frame body of the present invention does not have to have a perfect loop structure, and includes at least two substantially parallel parts (in the case of a backrest, left and right side frames) for attaching a body pressure receiving plate. I should do it.

The invention of claim 2 embodies claim 1, and the cushion material covers the main cushion material fitted in the main body portion and the entire main cushion material, and extends to the surface of the peripheral frame body. It is composed of a spread auxiliary cushion material, and the surface of the auxiliary cushion material is covered with a skin material.

According to a third aspect of the present invention, in claim 1 or 2, the edge portion of the body pressure receiving plate and the peripheral frame body are moved downward by overlapping the edge portion on the peripheral frame body from the surface side. An engaging portion is formed to hold the portion so that it cannot be disengaged.

According to the third aspect of the present invention, another body receiving member can be attached to the peripheral frame body, and the other body receiving member is formed at the edge of the body pressure receiving plate. By forming the same engaging portion as above, the body pressure receiving plate and other body receiving members can be replaced with the peripheral frame body.

Examples of other body pressure receiving members include those in which a flexible member such as a mesh material is stretched on a holding frame opened on the front and back sides. Alternatively, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2011-92539, it is also possible to adopt a support plate such as a back plate which is made flexible by forming horizontally elongated slits in multiple stages.

Further, since the body pressure receiving plate is also common as the body pressure receiving member, the invention of claim 4 is characterized in that a plurality of types of body pressure receiving portions can be selected and replaced with a common peripheral frame body. However, this feature can be an independent invention in its own right. In this case, it is preferable that the edge portion of each body receiving portion and the peripheral frame body are in a tightly meshed relationship, but the fixing means is not limited to the engaging portion, and for example, screwing or the like can be adopted.

In the present invention, since the cushion material is housed inside the thickness of the peripheral frame body in the front-rear direction, the body support such as the backrest can be made thin and compact as a whole. That is, for example, Japanese Patent Application Laid-Open No. 2011-92539 has a back plate attached to the peripheral frame body, and this configuration has advantages such as being economical because the back plate can be replaced and improving the freedom of design. However, if this configuration is diverted to a mere cushion type and the cushion material is merely arranged on the surface of the back plate, the backrest will be in a bulging state toward the front, whereas in the present invention, the peripheral frame body is used. Since the cushioning material can be arranged by effectively utilizing the enclosed dead space, the backrest has a higher cushioning property than the case where a thick cushioning material is stretched on the front surface of the above-mentioned Japanese Patent Application Laid-Open No. 2011-92539. The thickness can be reduced to make it more compact.

Further, if the body pressure receiving plate is damaged for some reason, only the body pressure receiving plate can be replaced. Therefore, it is economical. In addition, the body pressure receiving plate has a tray-like shape and high rigidity, but since this and the peripheral frame body reinforce each other, it can contribute to improving the strength of the body support as a whole.

When the configuration of claim 2 is adopted, even when the user's body hits the surface of the peripheral frame body, the hit can be softened by the auxiliary cushion material. Therefore, the usability can be improved. In addition, since the skin material can be held in a taut state by the auxiliary cushion material, it is also excellent in aesthetics.

When the configuration of claim 3 is adopted, the body pressure receiving plate can be easily attached to the peripheral frame without the trouble of screwing. Therefore, it is easy to assemble.

In the invention of claim 4, since a plurality of types of body pressure receiving members can be replaced with a common peripheral frame body, it is easy to change the specifications of the body support such as the backrest to a cushion type or a mesh type. realizable. Therefore, in arranging a plurality of types of body supports, it is possible to reduce the time and effort of designing, and it is possible to contribute to cost reduction by standardizing the members. Furthermore, in each type, the peripheral frame body can be exposed at the back, which is beneficial in terms of design unification.

It is a perspective view of the mesh type chair seen from the front, (A) shows the flexible sheet, and (B) shows the flexible sheet omitted. It is a perspective view which looked at the chair which concerns on embodiment from the rear, (A) is the thing which displayed the flexible sheet, (B) is the thing which omitted the flexible sheet. It is a separation perspective view of a back frame and a seat holding frame. It is a separation perspective view of a back frame and a seat holding frame. (A) is a separate perspective view of the back support and the back frame, and (B) is a perspective view showing a procedure for attaching the seat holding frame. It is a separation perspective view of a back frame and a seat holding frame. (A) is a sectional view taken along the line AA of FIG. 1 (B), (B) is a partially enlarged view of FIG. 1 (A), and (C) is a sectional view taken along the line CC of FIG. 1 (B). It is a longitudinal side view of the central part of the back part. It is a figure which shows the state which made it a cushion type, (A) is a perspective view which shows most of the appearance, (B) is a perspective view in a state which omits a cushion, (C) is a separated perspective view. It is a perspective view of the backrest seen from the back, (A) shows the back frame, and (B) shows the back frame omitted. It is a separation perspective view of a back plate and a back frame. (A) is a vertical sectional side view of the central portion showing the relationship between the back plate and the upper shell, and (B) is a separated perspective view of the back plate and the upper shell. 12 (B) is a plan sectional view taken along line XIII-XIII. (A) is a vertical sectional side view of the upper part of the central portion, and (B) is a vertical sectional side view of the lower part of the central portion.

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

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

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

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

Further, a tilting body (not shown) is connected to the base so as to be tilted backward by a left and right longitudinal support shaft, and a rear block 14 is fixed to the rear portion of the tilting body 1. The back support 16 is fixed to the rear portion of the rear block 14, and the upper end portion of the backrest 3 is attached to the upper end of the back support 16. The back support 16 has two vertical frames 26 on the left and right, and the upper ends of the vertical frames 26 on the left and right are integrally connected via a connecting portion 27.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Then, for example, as shown in FIG. 6, as a fitting means for the curl portion 53b and the upper frame 51, the first engaging hole 60 and the second engaging hole 60 are sequentially engaged in the upper frame 51 from the middle left and right to the outside. A pair of left and right engagement holes 62 are formed so as to open upwards, while a pair of left and right engagement holes 61 and a third engagement hole 62 are formed on the front surface of the curl portion 53b so as to correspond to the respective engagement holes 60, 61, 62. The first to third engaging protrusions 63 to 65 are provided. The engaging holes 60 to 62 and the engaging protrusions 63 to 65 form the engaging portion according to the claim.

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

Then, the upper end of the second engaging projection 64 abuts on the upper inner surface of the second engaging hole 62 with the second engaging hole 61, and the upper shell 53 (the curl portion 53b) is held immovably upward. .. The front surface of the upper part of the second engaging protrusion 65 is inclined in a side view so that it can be smoothly fitted into the second engaging hole 61 against elasticity (due to elastic deformation, the upper end claw). The part moves back and forth.) The second engaging projection 64 fits into the second engaging hole 61 so as not to be displaced in the front-rear direction and the left-right direction. Therefore, the second engaging protrusion 64 and the second engaging hole 61 have a function of positioning the upper shell 53 in the front-rear direction and a function of preventing the upper shell from coming off.

The third engaging protrusion 66 has an L-shaped side view, and when the third engaging protrusion 66 fits into the third engaging hole 62, the upper shell 53 (the curl portion 53b) is displaced back and forth. It is held incapable. A hanger and a bed rest can be attached to the upper frame 51, but the description of this point will be omitted.

In FIGS. 3 and 4, the back frame 41 is displayed in a state viewed from the front, and the seat holding frames 46 and 47 are displayed in a state viewed from the back (a state inverted by about 180 °). As can be understood from these FIGS. 3 and 4, the side member 52 of the first seat holding frame 46 has three pairs of vertically long first positioning protrusions 67 and downward claws 68 projecting vertically and backward. The side frame 50 of the back frame 41 has a pair of left and right first touch stopper protrusions 69 that sandwich the positioning protrusions 67 from the left and right.
And, the first claw catch 70 of the plane view gate type into which the downward claw 68 is fitted from above is formed in three stages at the top and bottom.

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

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

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

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

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

Since the upper and lower sheet holding frames 46 and 47 are attached to one flexible sheet 48, when the lower sheet holding frame 47 is attached to the back frame 41, the upper and lower sheet holding frames 46 and 47 are flexible. The sheets 48 are pulled closer to each other. Therefore, the upper and lower seat holding frames 46 and 47 are held so as not to move up and down. As shown in FIG. 6, the lower seat holding frame 47 is fixed to the lower frame 42 of the back frame 41 with screws 77. The screw 77 is located in the middle left and right, and is hidden by the upper end of the second interlocking link 36. Therefore, the lower sheet holding frame 47 can be fixed to the lower frame 42 without deteriorating the aesthetic appearance.

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

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

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

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

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

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

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

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

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

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

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

Further, the center engaging piece 96 is projected forward in the left and right middle portions of the upper shell 53, while the pair of left and right center fitting ribs 97 into which the center engaging piece 96 enters the upper member 87 of the back plate 85. The front end of the upper shell 53 is in contact with the rear end of the center fitting rib 97. Therefore, as is clearly shown in FIG. 13, the front end of the upper shell 53 is in a state of being stepped down from the lower surface of the upper member 87. However, since the degree of step drop is slight, the upper member 87 and the upper shell 53 are smoothly continuous. The center fitting rib 97 has an L shape, so that the upper shell 53 is held so as not to be vertically displaced.

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

Since the upper shell 53 has holes for forming protrusions, it is aesthetically pleasing to cover it with a skin material 92 that is bag-shaped and has a urethane sheet attached to the back surface (inner surface) as described above. It is preferable because it can prevent the deterioration of. The skin material 92 is fixed to the upper shell 53 with, for example, a tacker (may be adhered or the like). Further, also in the present embodiment, the upper shell 53 is provided with the first to third engaging projections 63 to 65 shown in FIG. 6, but since the skin material 92 is in the shape of a bag, the first The third engaging protrusions 63 to 65 are exposed through holes made in the skin material 92.

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

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

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

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

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

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

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

Although specific examples of the present invention have been described above, the present invention can be variously embodied. For example, although the embodiment has been applied to the backrest, it can also be applied to other body supports such as the seat. Needless to say, when applied to the backrest, it is not necessary for the lower part to move forward when seated.

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

1 Leg device 3 Backrest as an example of body support 16 Back support 26 Vertical frame 41 Back frame as an example of a peripheral frame 42 Lower frame 46 Upper seat holding frame 47 Lower upper seat holding frame 48 Flexible sheet 50 Side frame 51 Upper frame 52 Side member of upper seat holding frame 53 Upper shell 85 Back plate as an example of body pressure receiving plate (body pressure receiving member) 86 Side member of back plate 87 Upper member of back plate 88 Lower member of back plate 90 Main body 91 Cushion material 91a Main cushion material 91b Auxiliary cushion material 92 Skin material

The present invention relates to a backrest of the chair.

As a method of backrest odor chair child Te to have cushions property, roughly, the or be formed by the cushion type disposed cushion material on the front surface of the back plate (the back inner shell), the peripheral frame of the front and rear openings of the backrest It is adopted to be a mesh type with a mesh material stretched on the chair.

As a structure using the former cushioning material, in Patent Document 1, a back plate (back inner shell) is provided, and bank-shaped walls are provided on the left and right side portions and the lower end portion of the peripheral edge, whereby a large area is provided on the back plate. A configuration is disclosed in which a recess is formed and a cushioning material is arranged in the recess. Therefore, in Patent Document 1, the back plate is roughly in the shape of a shallow tray.

Japanese Patent No. 5676241

In Patent Document 1, since the cushion material is arranged in a concave portion of the back plate so as not to be displaced, the cushion material has excellent shape retention and has advantages such as being able to maintain a sharp contour on the backrest. Further, although the cushion material is covered with the skin material, in Patent Document 1, since the cushion material is accurately positioned, there is an advantage that the skin material can be easily attached regardless of the cushion material.

On the other hand, in chairs, cushion-type backrests and mesh-type backrests may be available as variations of the same model, and in this case, they are often designed as separate structures in the past. However, this causes a problem that it is difficult to control the cost because the members cannot be standardized, and a problem that the standardization of the appearance (especially the standardization when viewed from the back) is not always sufficient.

Further, even if it is viewed only as a cushion type, for example, if a part of the backrest is damaged, the whole backrest must be replaced, and it is not economical because it cannot be partially replaced.

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

The present gun invention has pleiotropic spread, it has identified the typical example in each claim.

Of these, the invention of claim 1 is
"It has a back frame that opens back and forth, a back plate attached to the front surface of the back frame, and a cushion material arranged on the front surface of the back plate.
The back plate has an edge portion that overlaps the front surface of the back frame and a shallow tray-shaped main body portion that is recessed backward from the edge portion so as to enter the space surrounded by the back frame.
The cushion material has a main cushion material that is fitted into the main body of the back plate and does not overlap the edge of the back plate, and an auxiliary cushion material that overlaps the front surface of the main cushion material.
The auxiliary cushion material also overlaps the edge of the back plate on which the main cushion material does not overlap from the front. "
It is configured as.

The back frame of the present invention is not necessarily a complete loop structures, for attaching the back plate, can it comprise at least approximately parallel two parts (left and right side frames).

The invention of claim 2 embodies claim 1.
"A skin material that covers the surface of the auxiliary cushion material is provided.
The end of the skin material is interposed between the back plate and the back frame. "
It is configured as.

The invention of claim 3 is claimed in claim 1 or 2.
On the edge and the back frame of "the back plate, the engaging portion for holding the disabled out of the edges is formed by causing the edges of the back plate is moved offset superimposed on the front surface of the back frame ing"
It is configured as.

The backrest according to the invention of claim 4 is
"The back plate and the back frame according to claim 3 and another body pressure receiving member having a structure different from that of the back plate according to claim 3 and which can overlap the front surface of the back frame, and the other body. a pressure receiving member, by forming the same engaging portion that was formed in the edge of the back plate, the back plate and the other body pressure receiving member is in the interchangeable on the back frame "
It is configured as.

Examples of other body pressure receiving members include those in which a flexible member such as a mesh material is stretched on a holding frame opened on the front and back sides. Alternatively, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2011-92539, it is also possible to adopt a support plate such as a back plate which is made flexible by forming horizontally elongated slits in multiple stages.

Then, since the common as the back plate and the body pressure receiving member, the invention of claim 4, it is the feature points that can be replaced by selecting a plurality of types of body pressure receiving member to a common back frame.

In each invention of the present application, since the main cushion material is housed inside the thickness of the back frame in the front-rear direction, the backrest can be made thin and compact as a whole. That is, for example, Japanese Patent Application Laid-Open No. 2011-92539 has a back plate attached to the back frame , and this configuration has advantages such as being economical because the back plate can be replaced and improving the freedom of design. However, if this configuration is diverted to a mere cushion type and the cushion material is merely arranged on the surface of the back plate, the backrest will be in a bulging state toward the front, whereas in the present invention, it is surrounded by the back frame. Since the main cushion material can be arranged by effectively utilizing the dead space, the thickness of the backrest is maintained while maintaining high cushioning property as compared with the case where a thick cushion material is stretched on the front surface of the above-mentioned Japanese Patent Application Laid-Open No. 2011-92539. It can be made thinner and more compact.

Further, if the back plate or other body pressure receiving member is damaged for some reason, only the back plate or other body pressure receiving member can be replaced. Therefore, it is economical. In addition, the back plate has a tray-like shape and high rigidity, but since this and the back frame reinforce each other, it can contribute to improving the strength of the backrest as a whole.

Further, in the present invention, even when the user's body hits the surface of the back frame , the hit can be softened by the auxiliary cushion material. Therefore, the usability can be improved. In addition, since the skin material can be held in a taut state by the auxiliary cushion material, it is also excellent in aesthetics.

When the configuration of claim 3 is adopted, the back plate can be easily attached to the back frame without the trouble of screwing. Therefore, it is easy to assemble.

In the invention of claim 4, since it replaces the plurality of types of body pressure receiving member to the common back frame, the back also Re other, and or a mesh type or a cushion type to change specifications, it can be easily realized. Therefore, in arranging a plurality of types of body supports, it is possible to reduce the time and effort of designing, and it is possible to contribute to cost reduction by standardizing the members. Furthermore, since the back frame of each type can be exposed at the back, it is also beneficial in terms of design unification.

It is a perspective view of the mesh type chair seen from the front, (A) shows the flexible sheet, and (B) shows the flexible sheet omitted. It is a perspective view which looked at the chair which concerns on embodiment from the rear, (A) is the thing which displayed the flexible sheet, (B) is the thing which omitted the flexible sheet. It is a separation perspective view of a back frame and a seat holding frame. It is a separation perspective view of a back frame and a seat holding frame. (A) is a separate perspective view of the back support and the back frame, and (B) is a perspective view showing a procedure for attaching the seat holding frame. It is a separation perspective view of a back frame and a seat holding frame. (A) is a sectional view taken along the line AA of FIG. 1 (B), (B) is a partially enlarged view of FIG. 1 (A), and (C) is a sectional view taken along the line CC of FIG. 1 (B). It is a longitudinal side view of the central part of the back part. It is a figure which shows the state which made it a cushion type, (A) is a perspective view which shows most of the appearance, (B) is a perspective view in a state which omits a cushion, (C) is a separated perspective view. It is a perspective view of the backrest seen from the back, (A) shows the back frame, and (B) shows the back frame omitted. It is a separation perspective view of a back plate and a back frame. (A) is a vertical sectional side view of the central portion showing the relationship between the back plate and the upper shell, and (B) is a separated perspective view of the back plate and the upper shell. 12 (B) is a plan sectional view taken along line XIII-XIII. (A) is a vertical sectional side view of the upper part of the central portion, and (B) is a vertical sectional side view of the lower part of the central portion.

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

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

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

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

Further, a tilting body (not shown) is connected to the base so as to be tilted backward by a left and right longitudinal support shaft, and a rear block 14 is fixed to the rear portion of the tilting body 1. The back support 16 is fixed to the rear portion of the rear block 14, and the upper end portion of the backrest 3 is attached to the upper end of the back support 16. The back support 16 has two vertical frames 26 on the left and right, and the upper ends of the vertical frames 26 on the left and right are integrally connected via a connecting portion 27.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Then, for example, as shown in FIG. 6, as a fitting means for the curl portion 53b and the upper frame 51, the first engaging hole 60 and the second engaging hole 60 are sequentially engaged in the upper frame 51 from the middle left and right to the outside. A pair of left and right engagement holes 62 are formed so as to open upwards, while a pair of left and right engagement holes 61 and a third engagement hole 62 are formed on the front surface of the curl portion 53b so as to correspond to the respective engagement holes 60, 61, 62. The first to third engaging protrusions 63 to 65 are provided. The engaging holes 60 to 62 and the engaging protrusions 63 to 65 form the engaging portion according to the claim.

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

Then, the upper end of the second engaging protrusion 64 comes into contact with the upper inner surface of the second engaging hole 61, and the upper shell 53 (the curl portion 53b) is held so as not to move upward. The front surface of the upper part of the second engaging protrusion 64 is inclined in a side view so that it can be smoothly fitted into the second engaging hole 61 against elasticity (due to elastic deformation, the upper end claw). The part moves back and forth.) The second engaging projection 64 fits into the second engaging hole 61 so as not to be displaced in the front-rear direction and the left-right direction. Therefore, the second engaging protrusion 64 and the second engaging hole 61 have a function of positioning the upper shell 53 in the front-rear direction and a function of preventing the upper shell from coming off.

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

In FIGS. 3 and 4, the back frame 41 is displayed in a state viewed from the front, and the seat holding frames 46 and 47 are displayed in a state viewed from the back (a state inverted by about 180 °). As can be understood from these FIGS. 3 and 4, the side member 52 of the first seat holding frame 46 has three pairs of vertically long first positioning protrusions 67 and downward claws 68 projecting vertically and backward. On the side frame 50 of the back frame 41, a pair of left and right first touch stopper protrusions 69 that sandwich the positioning protrusions 67 from the left and right, and a flat view gate type first claw catch 70 into which the downward claws 68 are fitted from above are three up and down. It is formed step by step.

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

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

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

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

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

Since the upper and lower sheet holding frames 46 and 47 are attached to one flexible sheet 48, when the lower sheet holding frame 47 is attached to the back frame 41, the upper and lower sheet holding frames 46 and 47 are flexible. The sheets 48 are pulled closer to each other. Therefore, the upper and lower seat holding frames 46 and 47 are held so as not to move up and down. As shown in FIG. 6, the lower seat holding frame 47 is fixed to the lower frame 42 of the back frame 41 with screws 77. The screw 77 is located in the middle left and right, and is hidden by the upper end of the second interlocking link 36. Therefore, the lower sheet holding frame 47 can be fixed to the lower frame 42 without deteriorating the aesthetic appearance.

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

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

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

(6). The cushion type shown in cushion type Specifications Figure 9-14, using the back plate 85 as an example of the body pressure receiving member. When the back plate 85 is used, the upper shell 53 has a different form from that of the mesh type. Regarding the parts common to the cushion type, the common reference numerals are shown in the drawings, and the description thereof will be omitted unless necessary.

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

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

A cushion material 91 is arranged on the front surface of the back plate 85 . As shown in FIGS. 13 and 14, the cushion material 91 is composed of a main cushion material 91a fitted into the main body 90 of the back plate 85 and a thin auxiliary cushion material 91b overlapping the surface thereof. The material 91b is covered with a skin material 92 (see FIG. 9A) . Then, the auxiliary cushion material 91b overlaps the side members 86 and the lower member 88 and the upper shell 53. The auxiliary cushion material 91b is made of a thin urethane sheet having a thickness of about 2 to 3 mm.

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

Since the auxiliary cushion material 91b is interposed between the skin material 92 and the side member 86 and the lower member 88, even if the seated person's body hits the front surface of the side member 86 and the lower member 88, the contact is alleviated. .. Part of the side members 86 is buffered even when hit on the top plate or the like of the desk, ing to tear prevention of the skin material 92.

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

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

Further, the center engaging piece 96 is projected forward in the left and right middle portions of the upper shell 53, while the pair of left and right center fitting ribs 97 into which the center engaging piece 96 enters the upper member 87 of the back plate 85. The front end of the upper shell 53 is in contact with the rear end of the center fitting rib 97. Therefore, as is clearly shown in FIG. 13, the front end of the upper shell 53 is in a state of being stepped down from the lower surface of the upper member 87. However, since the degree of step drop is slight, the upper member 87 and the upper shell 53 are smoothly continuous. The center fitting rib 97 has an L shape, so that the upper shell 53 is held so as not to be vertically displaced.

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

Since the upper shell 53 has holes for forming protrusions, it is aesthetically pleasing to cover it with a skin material 92 that is bag-shaped and has a urethane sheet attached to the back surface (inner surface) as described above. It is preferable because it can prevent the deterioration of. The skin material 92 is fixed to the upper shell 53 with, for example, a tacker (may be adhered or the like). Further, also in the present embodiment, the upper shell 53 is provided with the first to third engaging projections 63 to 65 shown in FIG. 6, but since the skin material 92 is in the shape of a bag, the first The third engaging protrusions 63 to 65 are exposed through holes made in the skin material 92.

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

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

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

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

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

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

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

Although specific examples of the present invention have been described above, the present invention can be variously embodied. For example, it goes without saying that the backrest does not have to be of the type in which the lower part advances when seated.

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

1 Leg device 3 Backrest as an example of body support 16 Back support 26 Vertical frame 41 Back frame as an example of a peripheral frame 42 Lower frame 46 Upper seat holding frame 47 Lower upper seat holding frame 48 Flexible sheet 50 Side frame 51 Upper frame 52 Side member of upper seat holding frame 53 Upper shell 85 Back plate as an example of body pressure receiving plate (body pressure receiving member) 86 Side member constituting the edge of the back plate 87 Conforming the edge of the back plate lower member 90 back plate main body 91 cushioning member 91a main cushioning material 91b assist cushion material 92 skin material constituting the edges of the upper member 88 back plate which

Claims (4)

Backrest or other body support,
It has a peripheral frame body opened on the front and back and a body pressure receiving plate attached to the peripheral frame body.
The body pressure receiving plate has an edge portion that overlaps the surface of the peripheral frame body and a main body portion that has entered the space surrounded by the peripheral frame body. Therefore, the main body portion has the peripheral frame. It has a shallow tray-like shape that fits within the thickness of the body, and a cushioning material is fitted into the main body.
Body support device for chairs. The cushioning material is composed of a main cushioning material fitted into the main body portion and an auxiliary cushioning material that covers the entire main cushioning material and extends to the surface of the peripheral frame body, and is composed of the auxiliary cushioning material. The surface is covered with skin material,
The body support of the chair according to claim 1. An engaging portion is formed on the edge portion and the peripheral frame body of the body pressure receiving plate to hold the edge portion so as not to be disengaged by overlapping the edge portion on the peripheral frame body from the surface side and moving the peripheral portion downward. Yes,
The body support of the chair according to claim 1 or 2. Another body pressure receiving member different from the body pressure receiving plate can be attached to the peripheral frame body, which is the same as that formed on the other body receiving member at the edge of the body pressure receiving plate. By forming the engaging portion, the body pressure receiving plate and another body receiving member can be replaced with the peripheral frame body.
The body support of the chair according to claim 3.

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