JP2024034516A - Body support part for chair - Google Patents

Abstract

To secure high fitness strength and appearance while securing high fitness/cushion properties by composing a back plate with elastomer in a backrest where a back plate is retrofitted to a back frame body.SOLUTION: A back plate 29 is composed of elastomer and, on a reverse surface of its outer peripheral part, reinforcement plates 37, 38 are fixed by insert molding. The reinforcement plates 37, 38 are fixed to back frames 7, 10 with engaging parts 44, 47 and machine screws 53. On a front surface of the back plate 29, a covering fabric 30 is arranged via edge members 34, 35, 36.SELECTED DRAWING: Figure 8

Description

The present invention relates to the body support portion of a chair in which a body support plate is retrofitted to a frame material. Here, the body support portion includes a backrest, a seat, an armrest, a headrest, and the like.

Many proposals have been made to improve the fit and cushioning properties of chair backs and seats. As a means for this, it has been proposed that, for example, in the backrest, the back plate be made of a flexible material such as elastomer, and one example of this is disclosed in Patent Document 1.

That is, in Patent Document 1, in a structure in which an elastomer back plate is fixed to a loop-shaped back frame that forms the outer periphery of the backrest, the portion of the back frame excluding the part that attaches to the support member is attached to the back plate. It is held at the outer periphery. Specifically, most of the back frame is held by the outer periphery of the back plate using an insert molding method.

Patent Document 1 is related to an application filed by the applicant of the present application, and the back frame is not exposed to the outside and the backrest has an appearance as if it is composed only of the backboard, so it has received high praise in the market as a novel design. is recieving.

Japanese Patent Application Publication No. 2013-103065

Although Patent Document 1 prevents the back frame from being exposed, chairs of a type in which a back plate is retrofitted to a back frame are widely used. It can be said that there is a demand for the back plate to be made of elastomer to maintain high fit and cushioning properties.

However, since elastomer has lower strength than general-purpose resins such as polypropylene, simply replacing the back plate with an elastomer may not provide the necessary fixing strength. Furthermore, when a reinforcing member is provided, it must be avoided that the reinforcing member is exposed and deteriorates the aesthetic appearance.

The present invention was made against the background of this current situation, and aims to disclose a technology that can maintain necessary strength and high fit and cushioning properties without deteriorating aesthetic appearance with respect to body support parts such as backrests. It is something.

The present invention includes various configurations, typical examples of which are specified in each claim. Among these, in the body support according to the invention of claim 1,
``It has a frame material that is open in the front and back direction, which is the direction in which the load of the seated person is applied, and a body support plate that is stacked on the frame material from the front side,
A reinforcing plate fixed to the body receiving plate is disposed on the back side of a portion of the body receiving plate that overlaps with the frame material, and the reinforcing plate is attached to the frame material.
The structure is as follows.

The invention of claim 2 embodies claim 1,
"The body receiving plate is made of a soft material, and the reinforcing plate is insert-molded in the body receiving plate."
The structure is as follows.

The invention of claim 3 is a specific example of claim 2,
"The reinforcing plate is covered with the back plate except for the rear surface."
The structure is as follows. In addition to or in place of the structure of claim 2, it is also possible to form a large number of through holes in the reinforcing plate and allow the flesh of the back plate to enter the through holes.

The invention of claim 4 is, in any one of claims 1 to 3,
"The frame material is a back frame, and the body receiving plate is a back plate,
The back frame includes vertically long left and right side members, an upper member connected between the upper ends of the left and right side members, and a lower member connected between the lower ends of the left and right side members. While the left and right side members have long grooves that open forward,
The back surface of the reinforcing plate is configured to fit into the long groove, and when the reinforcing plate is overlapped with the back frame and shifted in the vertical direction, the reinforcing plate engages with the back frame and is held in an unseparable manner. is being formed.”
The structure is as follows.

In claim 4, the reinforcing plate is attached to the back frame without screws by making the engaging part also have a function of preventing upward movement of the back plate, or by separately providing an engaging part having a function of preventing upward movement of the back plate. It is possible to install. Alternatively, in addition to the attachment using the engaging portion, it is also possible to have fixation using screws.

The invention of claim 5 is a development example of claim 4,
"The reinforcing plate has left and right side parts, an upper part, and a lower part, and at least the upper part and the lower part are fixed to the back frame with screws."
The structure is as follows.

The invention of claim 6 is a development example of claim 4 or 5,
"The side members of the back frame are bendable in side view using the mid-height as a fulcrum, and the side parts of the reinforcing plate are separated into upper and lower parts across the part that becomes the fulcrum of bending of the back frame. ”
The structure is as follows.

In the present invention, since the body support plate of the back plate is attached to the back frame via the reinforcing plate, it is possible to select the most suitable material for the body support plate and ensure reliable fixing strength. For example, even if the body receiving plate is made of a flexible material or structure, it can be firmly attached to the reinforcing plate. Therefore, the body support plate such as the back plate can be made flexible and can be firmly attached to the frame material while ensuring high fit and cushioning properties. Furthermore, since the reinforcing plate is hidden between the body support plate and the frame material and is not exposed, the aesthetic appearance does not deteriorate.

One means of imparting flexibility to a body support plate, such as a back plate, is to make the body support plate from a flexible material such as an elastomer. As another method, it is possible to use a general-purpose synthetic resin such as polypropylene as the material of the body receiving plate, and to make a large number of slits or holes, or to provide a large number of thin parts having a hinge function. Even when the body support plate is made of elastomer, it is possible to provide a group of slits, a group of ribs, etc. in order to make it easier to bend and deform or to meet design requirements.

When the body receiving plate is insert molded into the reinforcing plate as in claim 2, it becomes easy to use a flexible material such as elastomer as the body receiving plate. Further, there are also advantages that the fixing strength between the reinforcing plate and the body support plate can be improved, and that quality can be stabilized by eliminating assembly errors.

When the configuration of claim 3 is adopted, the fixing strength between the body support plate and the reinforcing plate is increased due to the synergistic effect of the increase in the contact area between the reinforcing plate and the body support plate and the meshing effect between the reinforcing plate and the body support plate. It can be further improved. Deterioration in aesthetic appearance due to exposure of the reinforcing plate can also be reliably prevented. By forming a group of through holes in the reinforcing plate and inserting the flesh of the body receiving plate into the through holes, the anchoring effect can further improve the fixing strength between the body receiving plate and the reinforcing plate. Either one or both of the structure of claim 3 and the through hole may be adopted.

By providing the engaging portion as in claim 4, the back plate can be easily attached to the back frame. Therefore, the efficiency of the backrest assembly work can be improved. Note that screw fastening can also be used, but in this case, since the backrest is held in a predetermined posture by the engaging portion, the screw fastening work can be performed quickly. It is also possible to reduce the number of screws.

In the backrest, the backboard is attached to the left and right side members of the back frame in a supported state at both ends, so the load of the seated person mainly acts to pull the backrest away from the side members of the back frame. Therefore, when the configuration of claim 4 is adopted, the load acting on the back plate is firmly supported by the side members of the back frame. Therefore, it is excellent in strength.

Since the upper part and the lower part of the reinforcing plate are long in the left-right direction, it may be difficult to form an engaging part that fits with vertical movement. In this regard, if the method of fixing the upper part and the lower part to the back frame with screws as in claim 5 is adopted, even if it is not possible to form an engaging part in the upper part and the lower part for reasons such as space, reinforcement can be achieved. The plate (or back plate) can be firmly fixed to the back frame. In this case, it is possible to screw the reinforcing plate to the back frame at the side locations as well.

Now, in recent years, most office work (or work from home) involves operating a computer, but it can be said that there is a desire to recline the body and view the computer without getting tired. To meet this request, it would be best to set the seat so that the seated person's head directly faces the computer when the seat is reclined.To do this, the upper part of the backrest should be rotated forward relative to the lower part when the seat is reclined. It is best to keep the head in an upright position.

According to the configuration of claim 6, in the reclining state, the upper part of the backrest rotates forward relative to the lower part, so that the seated person can face the computer head-on while suppressing the burden on the neck and shoulders. However, since the reinforcing plates are separated into upper and lower sections, the relative rotation (bending movement) of the backrest is not inhibited by the reinforcing plates. Therefore, the ability to operate a computer in a relaxed state can be ensured.

1 is a diagram showing the appearance of a chair to which the embodiment is applied, in which (A) is a perspective view seen from above the front, (B) is a front view, and (C) is a perspective view seen from above from the rear front. FIG. 3 is an exploded perspective view of the back component. (A) is an exploded view of the tilting frame and the upper back frame, (B) is an exploded perspective view of the upper part of the second tilting frame, and (C) is a plan view of the second tilting frame. FIG. 7 is an exploded perspective view of the back plate and the edge member seen from behind. FIG. 3 is an exploded perspective view of the reinforcing plate and the back frame. It is a separated front view of the reinforcing plate and the back frame (the reinforcing plate on the right is shown upside down). (A) is a perspective view of the edge member, (B) is a partially enlarged view of (A), and (C) is a plan sectional view seen from the VIIC-VIIC line of sight in FIG. 6. (A) is a plan sectional view seen from line VIIIA-VIIIA in FIG. 6, and (B) is a side sectional view seen from line VIIIB-VIIIB in FIG. FIG. 3 is a side view for explaining a rotating state.

Next, embodiments of the present invention will be described based on the drawings. In the following, words such as front and back and left and right will be used to specify the direction, but this direction is defined as the direction seen from a person sitting normally on a chair. The front view is a view seen from the direction facing the seated person.

(1).Overall overview First, an overview of the chair will be explained. This embodiment is applied to a rotary chair for office use. The chair includes a leg device 1, a seat 2, and a backrest 3 as basic elements. The leg device 1 has a structure in which a leg support 4 made of a gas cylinder is erected at the center of a base having five leg blades, and a caster is provided at the tip of each leg blade.

As shown in FIG. 1(A), a base 5 is fixed to the upper end of the leg support 4, and the lower tips of the left and right first tilting frames 6 shown in FIG. 2 are connected to the base 5. The first tilting frame 6 extends rearward from the base 5 and stands up while expanding outward to the left and right, and the portion that widens outward to the left and right constitutes a lower back frame 7. That is, the first tilting frame 6 and the lower back frame 7 partially share a member, and the upper part of the first tilting frame 6 serves as a side member 8 of the lower back frame 7.

The lower end of the lower back frame 7 is composed of left and right longitudinal lower members 9. That is, the lower back frame 7 is constructed by connecting the rising portions of the left and right first tilting frames 6 with a lower member 9 (see FIG. 1(C)). The lower member 9 of the lower frame body 7 is omitted in FIGS. 2 and 6.

The lower end of the upper back frame 10 is connected to the upper end of the lower back frame 7. The upper back frame 10 has a loop structure including left and right side members 11, an upper member 12 connected to the upper ends thereof, and a lower member 13 connected to the lower ends of the left and right side members 11.

In this embodiment, the lower back frame 7 and the upper back frame 10 constitute a back frame (frame material). Therefore, when looking at the back frame as a whole, the lower member 13 of the lower back frame 7 can be seen as a middle member of the back frame configured in a Japanese character shape.

The lower ends of the left and right side members 11 of the upper back frame 10 are connected to the upper ends of the side members 8 of the lower back frame 7 so as to be tiltable backward. On the other hand, the lower member 13 of the upper back frame 10 projects backward, and the upper end of the second tilting frame 14 is connected to the backwardly projecting lower member 13 so as to be tiltable backward. The lower end of the second tilting frame 14 is connected to the rear part of the base 5. This point will be explained based on FIG. 3.

As shown in FIG. 3(A), a plate-shaped male bearing portion 16 is integrally formed at the upper end of the left and right side members 8 constituting the upper back frame 10. A female bearing part 17 into which a male bearing part 16 enters from below is integrally formed at the lower end, and the upper and lower bearing parts 16 and 17 are connected by left and right longitudinal first pins 18. The first pin 18 is fixed to the upper back frame 10 by a screw (not shown).

As shown in FIG. 3(B), the second tilting frame 14 has a gutter-like shape that opens forward, and has a forward-facing bearing boss body 19 integrally formed at its upper end. The lower member 13 of the frame 10 is provided with bearing ribs 20 projecting downward that sandwich the bearing boss body 19 from the left and right sides, and these bearing boss bodies 19 and the left and right bearing ribs 20 are connected by left and right longitudinal second pins 21. ing.

A cover (lid) 22 that surrounds the connecting portion is attached to the upper end of the second tilting frame 14 . The cover 22 has a front plate 23 that covers the bearing boss body 19 and the bearing rib 20 from the front, and left and right side plates 24 that surround the bearing rib 20 from the left and right sides, and the front plate 23 has a large cutout downward. . Inside the second tilting frame 14, on both the left and right sides of the bearing boss body 19, a pair of regulation plates 25 on the left and right sides, which are trapezoidal in side view, are protruded forward. is positioned.

The side plate 24 of the cover 22 is provided with a pair of upper and lower guide ribs 26 into which the ends of the second pins 21 fit. In addition, upward engaging claws 27 are formed by cutting out the left and right side parts of the front plate 23 of the cover 22, and when the upward engaging claws 27 engage the bearing ribs 20 from below, the cover 22 It is held in such a way that it cannot be removed with a light force.

(2) Overview of the Back As shown in Figure 2, the backrest 3 includes a backboard 29 made of a flexible resin material such as elastomer, and an upholstery (skin material) 30 stretched on the front of the backboard 29. We are prepared. Since the back plate 29 is made of a flexible resin material, it has excellent fit to the body of a seated person. Further, when reclining, the upper back frame 10 and the lower back frame 7 rotate relative to each other, and the elastic deformation of the back plate 29 allows the relative rotation of both the back frames 10 and 7.

An upper rest 31 that supports the head and neck of the seated person is attached to the upper end of the backrest 3 so that its height can be adjusted. The upper rest 31 is attached to the upper member 12 of the upper back frame 10 via a bracket device (not shown). When the backrest 3 reclines, the upper back frame 10 rotates forward relative to the lower back frame 7, but since the head of the seated person is supported by the upper rest 31, the line of sight toward the computer monitor on the desk is not affected. It can be reclined without changing.

The tilting frames 6, 14 and the upper back frame 10 may be die-cast products of light metal such as aluminum, or molded products of engineering plastic. It is also possible that the first tilting frame 6 (and the lower back frame 7) and the second tilting frame 14 are made of aluminum, and the upper back frame 10 is made of synthetic resin.

As shown in FIGS. 2(A) and 3, an upward lumbar post 32 is integrally formed at the left and right intermediate portions of the lower member 9 constituting the lower back frame 7. A lumbar pad 33 that hits from behind is attached so that its height can be adjusted freely. The lumbar pad 33 supports the seated person's lumbar region (particularly around the third lumbar vertebrae) from behind.

As shown in FIG. 2, an upholstery (skin material) 30 made of woven or knitted fabric is arranged in front of the back plate 29. An upper edge member 34, an intermediate edge member 35, and a lower edge member 36 made of synthetic resin are sewn and fixed to the rear surface of the outer periphery of the upholstery 30. The upper edge member 34 is formed into a U-shape with a downward opening when viewed from the front, the left and right intermediate edge members 35 are formed into plate shapes, and the lower edge member 36 is formed into a U-shape with an upward opening when viewed from the front.

An upper reinforcing plate 37 and a lower reinforcing plate 38 are fixed to the outer peripheral rear surface of the back plate 29 by insert molding, and these reinforcing plates 37 and 38 are attached to the upper back frame 10 and the lower back frame 7. There is. The upper reinforcing plate 37 is formed in a U-shape with a downward opening when viewed from the front, and the lower reinforcing plate 38 is formed into a U-shape with an upward opening when viewed from the front. Therefore, the upper and lower reinforcing plates 37 and 38 have left and right side portions 37a and 38a that are long in the vertical direction. Furthermore, there is a certain amount of space between the upper and lower reinforcing plates 37 and 38. The details of the back will be explained below.

(3) Back frame/back board As can be understood from Figure 8, the side members 11 and upper members 12 that make up the upper back frame 10 have a groove that opens forward and has a gutter-like shape. There is. The same applies to the side members 8 and lower members 9 of the lower back frame 7. These members 11, 12, 8, and 9 have an outer circumferential plate 40 and an inner circumferential plate 41, but the longitudinal width of the outer circumferential plate 40 is smaller than the longitudinal width of the inner circumferential plate 41. Therefore, the rear surface of each member 11, 12, 8, 9 is inclined.

The back plate 29 has a large number of vertical grooves formed at a predetermined pitch on both the front and back surfaces, and a large number of rectangular slits (holes) are formed vertically at a predetermined pitch in each vertical groove. Therefore, the back plate 30 has a vertical striped pattern as a whole, and also has a lattice pattern formed by a large number of slits opened at the front and rear.

The back plate 29 also has an overlapping part (outer peripheral part) 29a that overlaps the members 11, 12, 8, and 9 of the upper and lower back frames 10, 7, and the overlapping part 29a is fixed to the reinforcing plates 37, 38 by insert molding. has been done. In this case, the overlapping portion 29a of the back plate 29 wraps around the outer and inner peripheral surfaces of the reinforcing plates 37 and 38. Therefore, the reinforcing plates 37 and 38 are surrounded by the overlapping portion 29a of the back plate 29 on three sides: the front surface, the inner circumferential surface, and the outer circumferential surface.

As clearly shown in FIGS. 7(C) and 8(B), forward facing outer circumferential ribs 42 are provided on the outer circumferential edges of the reinforcing plates 37, 38, and on the inner circumferential portions of the reinforcing plates 37, 38, A forward stepped portion 43 is formed, and the overlapping portion 29a of the back plate 29 enters into the forward stepped portion 43.

Then, due to the effect of increasing the adhesion area due to the provision of the outer peripheral rib 42 on the back plate 29 and the gripping effect due to the overlapping part 29a entering the forward stepped part 43, the back plate 29 and the reinforcing plates 37, 38 are bonded together. The fixing strength can be greatly improved. Note that the front surfaces of the reinforcing plates 37 and 38 are stepped down from the outer circumferential rib 42.

As shown in FIGS. 5 and 6, two upper and lower first engagement units 44 are formed at side portions 37a and 38a of the reinforcing plates 37 and 38 as part of the engagement portion described in the claims. The first engagement unit 44 includes a first engagement claw 45 that is outwardly hook-shaped in plan view, and first regulation plates 46 that are disposed on the left and right sides of the first engagement claw 45 .

On the other hand, the side members 11 of the upper back frame 10 and the side members 8 of the lower back frame 7 are provided with two upper and lower second engagements corresponding to the first engagement unit 44, as an example of the engagement portions described in the claims. A unit 47 is formed. The second engagement unit 47 is composed of a second engagement claw 48 that is L-shaped in plan view, into which the first engagement claw 45 is fitted and engaged from above, and second regulation plates 49 located on the left and right inner sides of the second engagement claw 48. There is.

When the back plate 29 with the reinforcing plates 37, 38 integrated therein is stacked on the back frames 10, 7 in a state slightly higher than the predetermined posture, and then the back plate 29 is shifted downward, the first engaging claw 45 moves into the second position. By engaging with the engaging claws 48, the back plate 29 is held so as not to be detachable in the forward direction. Further, since the first regulating plate 45 is located outside the second regulating plate 49, the side portions 37a, 38a are prevented from moving inward from side to side, and the first engaging claw 45 is moved closer to the second engaging claw 49. The engaged state is maintained.

As clearly shown in FIG. 5, the reinforcing plates 37, 38 are formed with a large number of cylindrical large-diameter boss portions 51 that project backward and are spaced apart in the circumferential direction. On the other hand, the upper back frame 10 and the lower back frame 7 are provided with a group of small diameter boss parts 52 protruding forward into which a cylindrical boss part 51 is fitted from the outside. It is fixed to the boss portion 52. Therefore, a flange plate 51a is formed on the large-diameter boss portion 51, and a tapped hole is formed on the small-diameter boss portion 52.

As mentioned above, when assembling the backrest 3, the backboard 29 is stacked on the back frames 7, 10 and then shifted downward to engage the engagement units 44, 47. However, between the boss parts 51, 52, A clearance is provided so as not to obstruct the downward movement of the back plate 29. Note that the boss portions 51 and 52 may be reversed in size.

The upper reinforcing plate 37 has left and right side parts and an upper part, and has a downwardly opening U-shape, and the lower reinforcing plate 38 has left and right side parts and a lower part, and has an upwardly opening U-shape. However, the upper part and the lower part are fixed only by screws 53, and the side parts are fixed by screws 53 and connected by engaging parts.

For example, as shown in FIG. 4, the reinforcing plates 37 and 38 are formed with a large number of through holes 54 that are open on the front and back sides, and the flesh of the back plate 29 is allowed to enter the through holes 54 during insert molding. Therefore, the fixing strength between the back plate 29 and the reinforcing plates 37 and 38 can be significantly improved due to the anchor effect.

(4).Skin material/Edge member As shown in Figure 7, the edge members 34, 35, and 36 are molded products made of synthetic resin such as polypropylene, and are basically in the form of a strip (tape). has been achieved. A group of L-shaped engaging claws 56 for attaching the edge members 34, 35, 36 to the back plate 29 and a headed boss 57 for temporarily fixing the upholstery 30 are formed on the back surface. . The peripheral edge of the upholstery 30 is folded back to the back side of the edge members 34, 35, 36, and is sewn to the inner circumferential portion of the edge members 34, 35, 36. Note that the folded portion of the upholstery 30 may be adhered to the edge members 34, 35, and 36.

The engaging claws 56 are formed on the longitudinally long parts of the intermediate edge member 35 and the upper and lower edge members 34 and 36, and the headed bosses 57 are formed on the upper side of the upper edge member 34, the lower side of the lower edge member 36, and It is provided at a lower portion of the intermediate edge member 35. Therefore, the upper side of the upper edge member 34 and the lower side of the lower edge member 36 do not engage with the back frames 10, 7.

For example, as shown in FIG. 7, engagement holes 59 into which engagement claws 56 fit are formed in the left and right side portions of the back plate 29 and the side portions of the reinforcing plates 37, 38. The engagement claw 59 is fitted into the engagement hole 59 by utilizing elastic deformation of the edge members 34, 35, and 36. As shown in FIG. 6, the upper half of the engagement hole 59 has a wide portion 59a. Therefore, when the edge members 34, 35, and 36 are shifted downward after the engagement claw 56 is fitted into the wide portion 59a, the engagement claw 56 falls into the narrow portion.

For example, as shown in FIG. 7, a forward facing rib 60 is formed on the outer peripheral edge of the back plate 29 over the entire circumference. Therefore, a stepped surface 61 is formed on the front surface of the back plate 29, and the edge members 34, 35, and 36 overlap the stepped surface 61 of the back plate 29. The upholstery 30 does not protrude further than the forward facing rib 60. Therefore, even if a person places a hand on the side of the backrest, the upholstery 30 will not be turned over.

Further, as described above, when the engaging claws 56 of the edge members 34, 35, 36 are fitted into the wide portion 59a of the back plate 30 and then the edge members 34, 35, 36 are completely shifted downward, the engaging claws 56 At the same time, the upper end of the upper edge member 33 overlaps the step surface 61 of the upper end of the back plate 30. As a result, upward movement of the edge members 34 , 35 , 36 and the upholstery 30 is prevented by the forward facing rib 60 .

For example, as shown in FIG. 2, a rectangular notch 62 is formed in the upper end of the upper edge member 34 in the middle between the left and right sides. In addition, a rectangular relief hole 63 is formed in the upper end of the back plate 29 and the upper end of the upper reinforcing plate 37. These notches 62 and escape holes 63 are for allowing a bracket (not shown) for attaching the upper rest 31 to escape.

Note that the upper rest 31 is made up of a base plate 64 shown in each section of FIG. An edge member 67 is sewn to the outer periphery. The substrate 64 is made of elastomer and is integrated into the frame 65 by insert molding. Further, a large number of pins protrude backward from the edge member 67, and the pins are tightly fitted into holding holes (not shown) provided in the frame 65. Further, a forward-facing rib 65a is formed on the outer periphery of the frame 65, and the upholstery 66 and the edge member 67 are housed in a stepped portion surrounded by the rib 65a.

(5).Summary In the above configuration, since the back plate 29 is made of elastomer, it fits well with the body of the seated person and has excellent fit and cushioning properties. In particular, when a large number of vertical grooves and slits are formed as in the embodiment, the fabric expands and deforms both vertically and horizontally, so that the fit and cushioning properties can be further improved.

Reinforcement plates 37 and 38 are fixed to the outer periphery of the back plate 29, and the reinforcement plates 37 and 38 are attached to the back frames 7 and 10, so that the reinforcing plates 37 and 38 are made of a material suitable for pointing the back. 29 and the reinforcing plates 37 and 38 made of materials suitable for obtaining the strength of the attachment portion of the back plate 29, increasing the degree of freedom in design. Further, since the outer circumferential portion of the back plate 29 is maintained in shape by the reinforcing plates 37 and 38, the back plate 29 can be held in close contact with the back frames 7 and 10, which is excellent in terms of aesthetics. If the back plate 29 is insert-molded into the reinforcing plates 37 and 38 as in the embodiment, it is preferable to improve fixing strength and dimensional accuracy.

As in the present embodiment, it is preferable to use the engagement units 44, 47 and the screws 53 together to attach the reinforcing plates 37, 38, since the reinforcing plates 37, 38 can be firmly fixed to the back frames 7, 10 without wobbling. It is. Since the edge members 34, 35, and 36 overlap the front surface of the back plate 29, the large-diameter boss portions 51 of the reinforcing plates 37, 38 are not exposed, and the aesthetic appearance is not deteriorated.

Further, since the upholstery 30 overlaps the stepped surface 61 of the back plate 29 and the forward rib 60 is surrounded, the upholstery 30 is accurately positioned with respect to the back plate 29. Therefore, the boundary between the upholstery 30 and the back plate 29 forms a sharp line, providing an excellent aesthetic appearance. As already mentioned, the upholstery 30 does not turn over.

In this embodiment, the tilting frames 6 and 14, the base 5, and the lower back frame 7 constitute a four-point link mechanism, but as shown in FIG. The connecting point 21 of the second tilting frame 14 to the lower back frame 7 is located behind the connecting point 18 of the upper and lower back frames 7 and 10. As a result, when reclining, the upper back frame 10 rotates forward relative to the lower back frame 7 (when reclining, θ1 becomes smaller).

Therefore, when working with a personal computer placed on a desk, the user can keep his or her face facing the personal computer even in a reclined state and maintain this posture using the upper rest 31. This allows you to comfortably operate your computer while reclining while preventing neck and shoulder stiffness.

In this embodiment, since the two reinforcing plates 37, 38 are separated into upper and lower parts, relative rotation of the upper and lower back frames 7, 10 is allowed, and the edge members 34, 35, 36 are arranged in three stages. Since the back plate 29 is separated into two parts, bending and deformation of the back plate 29 is also allowed. Therefore, it is possible to easily realize a chair that has excellent fit and cushioning properties and is also easy to operate a computer in a reclined state.

Although the embodiments of the present invention have been described above, the present invention can be embodied in various other ways. For example, the backrest does not have to be of the bending type. It can also be applied to non-reclining chairs. Furthermore, the present invention can also be applied to seats, elbow pads, etc. It is also possible to leave the front side of the backboard exposed without using upholstery. The reinforcing plate can be formed into a loop structure as a whole, or a separated structure with three or more stages can also be adopted.

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

3 Backrest 6 First tilting frame 7 Lower back frame (frame material)
8 Lower back frame side member 10 Upper back frame (frame material)
11 Side member of upper back frame 14 Second tilting frame 29 Back plate as an example of body support plate 30 Upholstery 31 Upper rest (headrest)
34 to 36 Edge member 37 Upper reinforcing plate 38 Lower reinforcing plate 44 First engagement unit 45 First engaging claw 46 First regulating plate 47 Second engaging unit 48 Second engaging claw 49 Second regulating plate 51 Large diameter Boss part 52 Small diameter boss part 53 Screw

Claims (6)

It has a frame material that is open in the front and back direction, which is the direction in which the load of the seated person is applied, and a body receiving plate that is stacked on the frame material from the front side,
A reinforcing plate fixed to the body receiving plate is disposed on the back surface of a portion of the body receiving plate that overlaps with the frame material, and the reinforcing plate is attached to the frame material.
The body support part of the chair. The body receiving plate is made of a soft material, and the reinforcing plate is insert molded into the body receiving plate.
A body support portion of the chair according to claim 1. The reinforcing plate is covered with the back plate except for the rear surface.
A body support portion of the chair according to claim 2. The frame material is a back frame, and the body receiving plate is a back plate,
The back frame includes vertically long left and right side members, an upper member connected between the upper ends of the left and right side members, and a lower member connected between the lower ends of the left and right side members. While the left and right side members have long grooves that open forward,
The back surface of the reinforcing plate is configured to fit into the long groove, and the reinforcing plate and the back frame have an engaging portion that engages and holds the reinforcing plate in an unseparable manner when the reinforcing plates are overlapped and shifted in the vertical direction. is formed,
A body support portion of a chair according to any one of claims 1 to 3. The reinforcing plate has left and right side parts, an upper part, and a lower part, and at least the upper part and the lower part are fixed to the back frame with screws.
A body support portion of the chair according to claim 4. The side members of the back frame are bendable in side view using the mid-height as a fulcrum, and the side portions of the reinforcing plate are separated into upper and lower parts across the part that becomes the fulcrum of bending of the back frame.
The body support part of the chair according to claim 4 or 5.

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