JP2023180489A - Chair - Google Patents

Abstract

To provide a technique which allows a user to easily replace a backrest of a chair.SOLUTION: A backrest 5 has a back inner shell 21 and a back cushion body 22 stretched on a front surface thereof, and the back inner shell 21 is inseparably held forward on a back outer shell 10 by male catches 62 and 64 to 66 and female catches 63 and 67 to 69. A coupling bracket 76 projects downward to a lower end of the back inner shell 21, and the coupling bracket 76 is fixed to the back outer shell 10 via another bracket 42. Since it is visually seen that the backrest 5 which releases the fixation of the coupling bracket 76 can be detached, a user can easily replace the backrest 5.SELECTED DRAWING: Figure 10

Description

The present invention relates to a chair in which a body support element such as a seat or a backrest is provided with an inner shell.

Chair seats and backrests have various structures, but a structure in which a cushion body is stacked on an inner shell and the inner shell is fixed to a receiving member such as an outer shell or a back frame is often used.

As an example, Patent Document 1 describes a structure in which a back inner shell (back main body) is attached to a back frame with a structure in which left and right support columns are connected by stays (back main body attachment seats), and the lower end of the back inner shell and the back frame are connected. It is disclosed that the back frame is connected to the stay by screw fixation, and the back frame support and the back inner shell are connected by claw members.

JP 2019-76361 (Patent No. 6952571)

Now, the backrest of a chair may become dirty or the cloth (upholstery material) may become frayed, and the user may therefore wish to replace the backrest. Alternatively, even if the color is not soiled, the user may want to change the color to a different color.

In these cases, the user has to remove the backrest and replace it, but in the case of Patent Document 1, with the structure of Patent Document 1, it is difficult to visually recognize the screws and the claw members are not visible from the outside, so how can this be done? I don't know if the backrest can be removed, so I either have to give up on replacing the backrest and continue using it, or I have to buy a new chair.In either case, it is hardly user-friendly, and the latter is a waste of resources. It would also be against the usage.

The present invention was developed against the background of this current situation, and it is an object of the present invention to provide a chair in which a user can easily replace body support elements such as a backrest.

The present invention includes various configurations, typical of which are specified in each claim. Among these, the chair according to the invention of claim 1 is:
"A body support element including at least one of a seat, a backrest, and an elbow rest, and a receiving member supporting the body support element, wherein the body support element includes an inner shell attached to the receiving member. , and a cushion body stacked on the inner shell.

In addition to the above basic configuration,
"The inner shell is held in a state of being stacked on the receiving member by an engaging means that functions when the inner shell is slid in a certain direction while being stacked on the receiving member, and is provided at a location outside the cushion body. is held in such a way that it cannot be removed from the receiving member by a movement preventing means.
This configuration has been added.

Here, if the body support element is a backrest, it is reasonable to move the back inner shell downward and hold it by the engagement means so that it cannot move forward, and if the body support element is a seat, It is reasonable to move the seat inner shell backwards and hold the seat without upward movement. When the body support element is an elbow rest, since the elbow rest is often in a long posture in the front-rear direction, it is reasonable to move the elbow inner shell backward or forward and hold it so that it cannot move upward.

The engaging means includes fitting or catching between the engaging part provided on the inner shell and the engaged part provided on the seat support member. Various aspects can be adopted, such as combinations of claws and engagement bar portions, combinations of engagement claws and engagement holes, and combinations of engagement claws. Whether used as a seat, a backrest, or an elbow rest, it is preferable to hold the inner shell in a state where it does not move laterally by the engaging means. That is, it is preferable that the engagement means has a rattling prevention function.

The chair according to the invention of claim 2 includes:
"It has a backrest with a back cushion body arranged in front of the back inner shell, and a back outer shell arranged behind the back inner shell."
In the basic configuration,
"The back inner shell is held so as not to move forward relative to the back outer shell by a fitting engagement means that moves the back inner shell downward while stacked on the back outer shell, and It is held in such a way that it cannot move upward by a movement preventing means provided on the outside of the cushion body.
It has the following configuration.

The invention of claim 3 is a development example of the invention of claim 2,
``The engagement means is composed of a group of backward-facing male catches provided in multiple stages on the rear surface of the inner shell, and a group of forward-facing female catches provided in multiple stages on the front surface of the back outer shell. ”
The structure is as follows.

The invention of claim 4 is a development example of claim 2 or 3,
"A coupling bracket exposed below the back cushion body is provided at the lower end of the back inner shell as the movement preventing means, and the coupling bracket is coupled to the back outer shell by a fastener."
The structure is as follows. As fasteners, screws or expandable push rivets can be used. Although different from the fourth aspect, the engagement bracket can also be connected to the back outer shell using an engagement structure such as a combination of an engagement claw and an engagement hole.

The invention of claim 5 embodies claim 4,
"The coupling bracket is hidden from the front by the seat."
The structure is as follows.

The invention of claim 6 is a development example of claim 4,
"The coupling bracket is coupled to a bracket provided on the back outer shell with a fastener."
The structure is as follows.

The invention of claim 7 is embodied in a backrest similar to claim 2,
"A backrest having a back cushion body arranged in front of the back inner shell, and a back outer shell arranged behind the back inner shell,
The back inner shell is held so as not to move forward relative to the back outer shell by fitting engagement means that moves the back inner shell downward while stacked on the back outer shell. It is held in such a way that it cannot move upward by a movement preventing means provided in a hidden location at the lower end of the cushion body.
In the basic configuration,
"The movement blocking means includes a movable catch that is hidden by the back cushion body and is provided at the lower end of the back inner shell, and a fixed catch that is provided on the back outer shell. When the movable catch is pushed from the front through the movable catch, the engagement between the movable catch and the fixed catch is released.
It has the following characteristics.

Now, as a means to prevent movement of the backrest or seat, it is conceivable to attach the inner shell to the receiving member using only fasteners such as screws, but in this case there are problems in that it takes time to attach, and in the case of the backrest, the head of the fastener is on the rear side. There is a problem in that the beauty is spoiled due to exposure to However, with the retaining means that utilizes elastically deformable engaging claws, there are problems in which it is not clear from the appearance how to remove the engaging claws from the receiving member, and the problem is that the engaging claws are maintained in the disengaged state. There is a problem that it is troublesome to move the inner shell while doing so, which is difficult for users to deal with.

On the other hand, if the method of exposing the movement preventing means to the outside of the cushion body as in Claims 1 and 2 of the present application is adopted, the movement preventing means is visible to the user, and the user can easily check the body support elements such as the backrest. It is natural to try to release the fixation by the movement prevention means in order to remove the body support element, and after releasing the fixation by the movement prevention means, try to separate the body support element from the seat support member. For example, in the case of a backrest, Pull it towards you or pull it downwards.

Then, the direction in which the body support element is moved by the user and the engagement direction of the engagement means match, and the body support element is disengaged from the seat support member. Therefore, the user can easily remove the body support element from the seat support member by performing a common-sense operation that can be visually recognized without looking at the instruction manual. After removing the body support element, by visually checking the engagement means provided on the mating surfaces of the body support element and the seat support member, the structure of the engagement means can be understood and a new body support element can be installed. .

Therefore, when a body support element such as a backrest becomes soiled, it is possible to easily replace only the body support element, thereby meeting the user's wishes. Additionally, since there is no need to replace the entire chair, it can contribute to the effective use of resources.

Although various structures can be adopted for the engagement means, when the structure of claim 3 is adopted, the combination of the male type catch and the female type catch is easily recognized visually, so that the attachment can be performed quickly.

By providing the connecting bracket exposed below the back cushion body as a movement preventing means as in claim 4, the connecting bracket is always visible to the user and the user can visually understand the procedure for removing the backrest. The ease of replacing the backrest can be further improved. Furthermore, in the case where the joint bracket is provided as in claim 4, if the joint bracket is hidden from the front by the seat as in claim 5, the joint bracket cannot be seen from the outside when the chair is in use, resulting in deterioration of aesthetic appearance. You can easily replace the backrest without having to bring it back.

In the present invention, the coupling bracket may be directly fixed to the back outer shell, but if it is coupled to the bracket provided on the back outer shell with a fastener as in claim 6, the structure of the back outer shell becomes complicated. It can be prevented. Further, since the coupling bracket and the rear outer shell bracket have a high degree of freedom in design, there is an advantage that the coupling bracket can be placed at an appropriate position.

In claim 7, although the user cannot visually grasp the movement prevention means, since the user usually presses around the peripheral edge of the cushion body with his or her fingertips in search of a clue for removal, it is possible for the user to press the peripheral edge of the cushion body around the cushion body. When the body support element hits the movable catch of the movement prevention means, the fixation by the movement prevention means is released, but the user senses the release of the fixation and attempts to move the body support element in various directions in an attempt to separate it from the receiving member. .

Then, when the direction in which the body support element is moved becomes the same as the disengagement direction of the movable catch, the body support element is moved from the receiving member, and the body support element is removed from the receiving member. In this case, if a configuration is adopted in which the movable catch is held in a state separated from the fixed catch once the movable catch is pressed, there is no need for a person to keep pushing the movable catch, and the user can use both hands. Body support elements can be removed. This allows the user to easily remove the backrest. Furthermore, tools such as a screwdriver are not required when removing and attaching the backrest, which also reduces the effort required to attach the backrest.

FIG. 2 is an external view of the chair according to the embodiment, in which (A) is a perspective view seen from the upper front, (B) is a perspective view seen from the upper back, (C) is a perspective view seen from the lower front, and (D) is a perspective view seen from the rear and below. (A) is a perspective view with the backrest and the seat inner shell separated, (B) is a perspective view with the seat separated, and (C) is a partial side view. It is a perspective view which separated the seat inner shell and the seat outer shell. (A) is an exploded perspective view of the seat outer shell and the rear spring receiver, (B) is an exploded perspective view of the support mechanism, and (C) is a perspective view showing the relationship between the back outer shell and the base. (A) and (B) are perspective views showing the relationship between the seat outer shell and the base, and (C) is a perspective view of the back inner shell mainly viewed from behind. (A) is a perspective view showing the lift operation mechanism and the tilting lock mechanism, (B) is an isolated perspective view showing the relationship between the support mechanism and the back outer shell, and (C) is a perspective view centered on the lock mechanism. be. (A) is a longitudinal sectional side view of the left and right intermediate portions of the seat, (B) is a sectional view taken from the VII-VII viewing direction in FIG. 3, and (C) is a partially enlarged view of (A). (A) is an exploded perspective view showing the installation procedure of the seat inner shell, (B) is a perspective view of the seat inner shell seen from the back side, and (C) is a perspective view of the multifunctional bracket seen from below. (A) is a perspective view with the seat outer shell and back cushion body omitted, (B) is a perspective view with the back inner shell separated, and (C) is a partial front view. (A) is a plan view of the back inner shell, and (B) is a perspective view of the back inner shell separated. FIG. 3 is a diagram showing another example of the backrest, in which (A) is a perspective view, (B) is a partial front view of the back inner shell, and (C) is a perspective view with the back inner shell separated. (A) is a perspective view with the back inner shell separated, and (B) is a partial perspective view of the back inner shell seen from the back side.

Next, embodiments of the present invention will be described based on the drawings. In the following explanation, words such as "front and rear" and "left and right" are used to indicate directions, but these words are based on the direction facing a person sitting in a chair in a normal posture. The front view is a state seen from the direction facing the seated person.

(1).Overview First, I will explain the overview. The chair of this embodiment is a rotary chair that is often used for office work, and as shown in FIGS. 1 and 2, the chair has a leg support (gas cylinder) 2 and a plurality of leg blades as main elements. The device includes a leg device 1, a base 3 fixed to the upper end of a leg support 2, a seat 4 disposed above the base 3, and a backrest 5 connected to the base 3 so as to be tiltable backwards. A caster is provided at the tip of each leg blade constituting the leg device 1.

An armrest 7 is attached to a portion of the lower surface of the base 3 in front of the leg support 2 via an elbow bracket 6. Although only one armrest 7 is shown on the left side in the figure, a pair of armrests 7 can be attached on the left and right sides. The armrest 7 is an optional item and may not be installed in some cases. If the armrest 7 is not attached, the elbow bracket 6 is also not attached. Therefore, the elbow bracket 6 is a special item for attaching the armrest 7.

For example, as shown in FIGS. 2A and 2C, the chair includes a front seat outer shell 8 and a rear seat outer shell 9 to which the seat 4 is attached from above, and a back outer shell 10 to which the backrest 5 is attached from the front. Therefore, the rear seat outer shell 9 and the back outer shell 10 are integrated. This embodiment is applied to the mounting structure of the backrest 5. The rear end of the front seat outer shell 8 and the front end of the rear seat outer shell 9 are connected so as to be relatively rotatable by a left and right longitudinal connection shaft 11 shown in FIG. 2(B) (details will be described later).

As shown in FIGS. 2(A) and 3, the support mechanism of the chair includes a spring (compression coil spring) 12 that expands and contracts in the front-rear direction as an example of elastic support means for reclining. 12 and tilts backward using the connecting shaft 11 as a fulcrum. Further, the seat outer shells 8 and 9 move forward in conjunction with the backward tilting of the backrest 5.

Furthermore, since the rear seat outer shell 9 is integrated with the back outer shell 10, the rear seat outer shell 9 tilts backward together with the back outer shell 10, but the front seat outer shell 8 moves forward without tilting backward. only. Therefore, in conjunction with the backward tilting of the backrest 5, the front seat outer shell 8 (the front part of the seat 4) and the rear seat outer shell 9 (the rear part of the seat 4) rotate relative to each other.

As shown in FIGS. 2(A) and 3, the synthetic resin seat inner shell 13 constituting the seat 4 has a front portion 13a that overlaps the front seat outer shell 8 and a rear portion 13b that overlaps the rear seat outer shell 9. By connecting the front seat outer shell 8 and the rear seat outer shell 9 with a bendable hinge portion 14, relative rotation between the front seat outer shell 8 and the rear seat outer shell 9 is allowed. Therefore, when reclining (rocking) the backrest 5, the seat 4 moves forward as a whole and bends around the hinge portion 14 as a fulcrum.

A front portion 13a of the seat inner shell 13 is attached to the front seat outer shell 8, and a rear portion 13b is attached to the rear seat outer shell 9. As shown in FIG. 1, a hanger 15 as an optional item can be attached to the upper end of the back outer shell 10.

(2).Details of the support mechanism section Next, details of each part will be explained. First, the support mechanism centering on the base 3 will be explained. For example, as shown in FIGS. 3, 4(B)(C), and 6(B), the base 3 is made of sheet metal and has an upwardly opening box-like shape having a bottom plate and left and right side plates 3a, It has a long shape in the front and back direction. As shown in FIGS. 6(B) and 7(A), a bush 19 is fixed inside the base 3 via a U-shaped reinforcing bracket 18, and the upper end of the leg support 2 is fitted into the bush 19 from below. I'm wearing it. As shown in FIGS. 3, 4(B), and 4(C), the upper ends of the left and right side plates 3a constituting the base 3 are provided with side flanges 3b extending left and right outward in the front-rear direction.

As shown in FIG. 7(A), the seat 4 has the seat inner shell (seat plate) 13 made of resin already mentioned and the seat cushion body 20 disposed thereon as its main elements. It is covered with a skin material such as cloth or leather. For example, as shown in FIG. 8(B), the hinge portion 14 of the seat 4 is composed of a large number of downwardly curved U-shaped connecting pieces, with slits formed between adjacent connecting pieces.

For example, as schematically shown in FIG. 2(A), the backrest 5 has a back inner shell (backboard) 21 made of synthetic resin and a back cushion body 22 disposed in front thereof as main elements. The body 22 is covered with a skin material such as cloth. A back inner shell 21 is attached to the previously described back outer shell 10.

As mentioned above, the rear seat outer shell 9 is integrally formed at the lower end of the back outer shell 10. For example, as shown in FIG. Separated. Therefore, the rear seat outer shell 9 has a bifurcated shape.

The above-mentioned connecting shaft 11 is spanned over the bearing portion provided at the front end of the left and right rear seat outer shells 9 via the bearing, while the front seat At the rear end of the outer shell 8, a plurality of downwardly directed ribs 23 are arranged side by side and protrude downwardly, and each downwardly directed rib 23 is provided with a rear spring receiver 24 which is U-shaped in plan view and is made of sheet metal and has left and right backwardly facing side plates 24a. They overlap from the front, and the connecting shaft 11 passes through the side plate 24a of the rear spring receiver 24 and the downward rib 23 of the front seat outer shell 8.

Therefore, the front end of the rear seat outer shell 9 and the rear end of the front seat outer shell 8 are connected by the connecting shaft 11 so as to be relatively rotatable. As can be understood from FIG. 4(C), the inner portions 9a of the left and right rear seat outer shells 9 overlap the side flanges 3b of the base 3 from below. Therefore, the rear seat outer shell 9 rotates downward about the connecting shaft 11 as a fulcrum, but does not rotate upward (the backrest 5 does not rotate forward even if it tilts backward).

For example, as shown in FIG. 4(B), the front end of the spring 12 is held by a front spring receiver 25 so as not to be displaced. The front spring receiver 25 is mounted in a hole provided in the front wall of the base 3.

For example, as shown in FIGS. 5(A) and 5(B), the rear end of the base 3 has an overhanging portion 3c extending obliquely upward, and the left and right longitudinal tilting guide shafts 26 are provided at the rear ends of the overhanging portion 3d. is fixed so that both ends thereof are exposed outside the base 3, and a resin slider 27 is attached to the exposed part of the tilting guide shaft 26. For example, as shown in FIG. 6(B), the back outer An arcuate tilting guide groove 28 into which the slider 27 is slidably fitted is formed at the lower end of the shell 10.

Therefore, the lower end of the backrest 5 moves forward while being guided by the tilting guide groove 28 while tilting backward and descending, and the seat 4 moves forward in conjunction with this. Therefore, the lower part of the back outer shell 10 goes below the seat surface, and the lower part of the back outer shell 10 goes under the base 3 during reclining. As shown in FIG. 6(B), a relief groove 29 is communicated with the front end (lower end) of the tilting guide groove 28 to allow the slider 27 to be fitted during assembly of the chair.

Note that the lower part of the tilting guide groove 28 extends to the rear seat outer shell 9. That is, the tilting guide groove 28 is formed so as to span both the rear seat outer shell 9 and the back outer shell 10.

For example, as shown in FIG. 5(B), a left and right longitudinal guide bar 30 is fixed to the upper front end of the base 3 with its left and right ends exposed to the outside of the base 3. On the other hand, as also shown in FIG. 5(B), the front seat outer shell 8 is formed in the shape of a rectangular frame in plan view with a square opening. A longitudinal guide groove 33 is formed in which the guide bar 30 is slidably fitted. The front seat outer shell 8 has a basic shape of a shallow dish, and has many ribs formed inside.

Therefore, the front seat outer shell 8 is supported by the guide bar 30 and moves back and forth, and is held by the guide bar 30 so as not to be able to move upward, and also moves back and forth while being supported by the connecting shaft 11. In this case, the connecting shaft 11 slides on the upper surface of the side flange 3b of the seat 4, but because the rear seat outer shell 9 approaches the side flange 3b of the base 3 from below, the connecting shaft 11 cannot move upward. Because of this, the front seat outer shell 8 is also held as a whole so that it cannot be separated upward.

As clearly shown in FIG. 5(B), a notch 34 is formed at the rear of the guide groove 33 of the front seat outer shell 8, and the notch 34 is a plug that is attached to the front seat outer shell 8 from above. It is blocked by 35. This is a measure to enable the front seat outer shell 8 to be assembled. During assembly, the guide bar 30 is inserted into the left and right ends of the guide bar 30 through relief grooves 33a formed in the downward wall 32 so as to communicate with the front ends of the guide grooves 33, and then the notches 34 are closed with plugs 35.

As shown in FIG. 6(B), the elevating mechanism mount material 38 is fixed to the inside of the base 3 behind the reinforcing bracket 18 with screws, and the right side of the elevating mechanism mount material 38 is attached to the leg support. The support shaft portion 39a of the lift operation lever 39 that pushes the second push valve is rotatably held. Therefore, a bearing groove 38a is formed in the right side of the elevating mechanism mount member 38, into which the support shaft portion 39a of the elevating operation lever 39 is fitted. As shown in FIG. 1(D), the lift operation lever 39 is exposed outward (to the right) through a hole provided in the lower surface of the base 3. As shown in FIG.

As shown in FIGS. 6(A) and 6(C), the lower end of the tilting lock body 40 is fitted into the lifting mechanism mount material 38, and the lower end of the tilting lock body 40 is attached to the base of the tilting operation lever 41. The end portion is connected to a lifting mechanism mount material 38. The base end portion of the tilting operation lever 41 is fitted into the tilting lock body 40 so as to be relatively unrotatable, and the tilting lock body 40 rotates when the tilting operation lever 41 is rotated.

By its rotation, the tilting lock body 40 has a tilting lock position in which it comes into contact with the multi-function bracket 42 fixed to the inner surface of the lower part of the back outer shell 10, and a free position in which it does not come into contact with the multi-function bracket 42. (When the tilting lock body 40 rotates downward, it becomes a free position.) Naturally, in the locked position, the backrest 5 is held so that it cannot tilt backward, and in the free position, the backrest 5 is held so that it can freely tilt backward.

(3).Seat inner shell mounting structure Next, the mounting structure of the seat inner shell 13 will be explained. As shown in FIG. 8, a plurality of plate-shaped boss bodies 44 that rest on the front seat outer shell 8 are protruded from the lower surface of the front portion 13a of the seat inner shell 13.

On the other hand, on the lower surface of the rear end of the rear portion 13b of the seat inner shell 13, an engaging pawl 45 having a rearward hook portion 45a and having a hook shape (L-shape) in side view is provided to protrude downward. The seat outer shell 9 is formed with an engagement frame portion 46 into which the hook portion 45a of the engagement claw 45 is fitted from below. The engagement frame portion 46 has an engagement bar portion 46a with which the hook portion 45a of the engagement claw 45 is engaged (caught), and side frame portions 46b connected to both left and right ends of the engagement bar portion 46a, and has a flat surface. It has a U-shaped appearance.

For example, as shown in FIGS. 8(A) and 7(B), an engaging claw 45 is provided on the front side of the engaging frame portion 46 of the rear seat outer shell 9 so that the engaging claw 45 is not inserted into the engaging frame portion 46. A guide groove 47 for guiding is formed. For example, as shown in FIG. 3, the front seat outer shell 8 is formed with upwardly bulging land portions 56 at three locations in the front portion, right and left middle portions and left and right side portions. The section 56 is connected to the front seat outer shell 8 by an expandable push rivet 48.

Therefore, a downward boss portion 49 is formed in the front portion of the seat inner shell 13, while a receiving seat 50 is formed in the front seat outer shell 8 to bulge upward, and the downward boss portion 49 abuts from above. The receiving seat 50 is formed with a cylindrical upward boss part 51 into which the downward boss part 49 is fitted with almost no gap. A mounting hole 52 is formed in the downward boss portion 49 and the receiving seat 50.

The expandable push rivet 48 has a flange 53a at the base end and a split outer cylinder 53, and a rod 54 that is fitted into the outer cylinder 53 from the base end. With the tube 53 narrowed, when the outer tube 53 is inserted into the mounting hole 52 from below and then the rod 54 is pushed in, the outer tube 53 is expanded by the action of the tapered surface formed at the tip of the rod 54. .

A flange 54a is also provided at the base end of the rod 54 that constitutes the expandable push rivet 48, and when the rod 54 is pushed in, the two flanges 53a and 54a overlap. The outer cylinder 53 has a slightly smaller diameter than the flange 53a, and the flange 53a of the outer cylinder 53 is formed with an escape groove 55 so that a toe or the like can be hooked onto the flange 54a of the rod 54. Therefore, when replacing the seat 4, the rod 54 can be moved backward and the expandable push rivet 48 can be removed.

(4). Back Structure Next, the backrest 5 and the back outer shell 10 will be explained. As shown in FIG. 10(B), a pair of left and right vertically long main ribs 58 are formed on the rear surface of the back inner shell 21, and extend vertically over substantially the entire height, and as shown in FIG. 5(C), An upper part 59a of the reinforcing pipe 59 is inserted from below into a downwardly opening tunnel part 58a provided at the lower part of the vertically long main rib 58.

The reinforcing pipe 59 has an upper part 59a that is long in the vertical direction, a lower part 59 that is long in the front-rear direction, and an inclined part 59c that connects the two.The lower part overlaps the rear seat outer shell 9 from above and forms the inclined part 59c. mainly overlaps the lower part of the back outer shell 10. The flap 42a provided on the multi-function bracket 42 holds the back outer shell 10 so as not to separate from the back outer shell 10 (it may also be held and fixed by the multi-function bracket 42). As can be understood from FIG. 10(B), the lower portion 59b of the reinforcing pipe 59 is located inside the engagement frame portion 46.

As shown in FIG. 10(B), the left and right vertically long main ribs 58 are connected by a pair of horizontally long ribs 60 separated vertically, and a cross rib 61 is provided inside the vertically long main rib 58 and the horizontally long rib 60. ing. Similarly, as shown in FIG. 10(B), a pair of left and right first male catches 62 are provided at the upper part of the rear surface of the back inner shell 21 and inside the vertically elongated main rib 58. is provided with a first female catch 63 into which the first male catch 62 is fitted from above.

As shown in FIG. 10(B), a second male catch 64, a third male catch 65, and a fourth male catch 66 are located on the outside of the vertically long main rib 58 in the back inner shell 21 in order from the top. is protruded backwards. On the other hand, the front surface of the back outer shell 10 includes a second female catch 67 into which the second male catch 64 is fitted from above, a third female catch 68 into which the third male catch 65 is fitted from above, and a third female catch 68 into which the third male catch 65 is fitted from above. A fourth female catch 69 into which the fourth male catch 66 fits from above is provided to protrude forward. The male catches 62, 64 to 66 and the female catches 63, 67 to 69 are examples of engagement means described in the claims.

At least the outer surface of each of the female catches 63, 67 to 69 is inclined in plan view so that the left-right distance narrows toward the front. On the other hand, the first male catch 62, the second male catch 64, and the fourth male catch 66 are provided with locking flaps 70 that face outward in the left and right directions. Therefore, at the first male catch 62, second male catch 64, and fourth male catch 66, the back inner shell 21 (the backrest 5) is held so as not to be able to move forward. When the tunnel portion 58a of the back inner shell 21 is fitted into the upper part 59a of the reinforcing pipe 59 from above, each of the male catches 62, 64-66 becomes the female catch 63, 67-69 due to the downward movement of the back inner shell 21. insert.

The multifunctional bracket 42 is made of synthetic resin, and as shown in FIG. 6(C), has a base 71 fixed to the back outer shell 10 with screws 76b (see the right end in FIG. 7(A)), and a base 71 that is fixed to the back outer shell 10 with screws 76b (see the right end in FIG. It has a lock receiving part 72 which protrudes downward and comes into contact with the tilting lock body 40, and a surrounding frame part 73 which protrudes upward from the base part 71.

As can be understood from FIG. 6(B), the arc-shaped tilt guide groove 28 is formed on the inner surface of the protrusion 74 that extends continuously between the lower part of the back outer shell 10 and the rear seat outer shell 9. The base 71 of the multifunctional bracket 42 is fixed to the top surface of the protrusion 74 with screws. Therefore, the base 71 of the multifunctional bracket 42 has a screw insertion hole, and a nut 75 shown in FIG. 8(C) is mounted inside the protrusion 74.

As shown in FIG. 10(B), the enclosing frame portion 73 of the multifunctional bracket 42 has left and right side plates 73a and a back plate 73b continuous thereto, and left and right arms are attached to the lower end of the back inner shell 21. A coupling bracket 76 provided via a shaped rib 76a is fixed to a back plate 73b of the enclosure frame portion 73 with screws 76b. The coupling bracket 76 is formed to overhang behind the rear surface of the lower end of the back inner shell 21.

When fixing the coupling bracket 76 with the screws 76b, tapped holes into which the screws 76b are screwed may be formed in the back plate 73b of the enclosure frame 73, or nuts may be attached. It is also possible to use the expandable push rivet 48 as in the case of the seat 4 without using the screw 76b.

As clearly shown in FIG. 9(C), the coupling bracket 76 of the back inner shell 21 is exposed below the back cushion body 22. Therefore, the head of the screw 76b or expandable push rivet 48 that fixes the coupling bracket 76 is exposed below the back cushion body 22. Therefore, when the user replaces the backrest 5, the user can immediately know that the screw 76b or the expandable push rivet 48 should be removed.

After removing the screw 76b or the expandable push rivet 48, the user usually tries to pull the backrest 5 toward you or upwards, so the user does not have to read the instruction manual. Also, the backrest 5 can be easily removed and replaced. In addition, since the coupling bracket 76 is not visible to the public when the seat 4 is attached, the aesthetic appearance does not deteriorate. Note that the reinforcing pipe 59 and the tunnel portion 58a also function as engagement means.

(5).Other embodiments FIGS. 11 and 12 show a second embodiment. In this embodiment, first, a convex hollow hole 78 is formed in the lower part of the back inner shell 21, and a movable catch 79 is integrally formed in the hollow hole 78. The movable catch 79 includes an elastically deformable arm portion 80, a horizontal engaging portion 81 provided at the tip of the arm portion 80, and one push operation portion (button) 82 protruding toward the front from the tip of the arm portion 80. and a return prevention piece 83 that protrudes from the front and back middle portions of the arm portion 80 to the left and right. The return prevention piece 83 constitutes a part of the regulating means described in the claims.

On the other hand, the back outer shell 10 is provided with a pair of left and right inward protrusions (lock portions) 84 with which the engaging portion 81 of the movable catch 79 engages from below. The inward protrusion 84 is formed on a bracket 85, and the inward protrusion 84 and the bracket 85 form a fixed catch 85. When the movable catch 79 rotates, the engaging portion 81 of the movable catch 79 can move to the back side of the inward protrusion 84.

When the push operation part 82 is pushed through the back cushion body 22, the arm part 80 of the movable catch 79 is bent and deformed, and the engaging part 81 escapes behind the inward protrusion 84 and moves inward. Although the engagement between the protrusion 84 and the movable catch 79 is released, the back inner shell 21 is provided with a support piece 86 on which the return prevention piece 83 rests when the arm portion 80 of the movable catch 79 is bent and deformed. Therefore, the arm portion 80 is held in a flexibly deformed state, and the backrest 5 can be moved upward. The support piece 86 cooperates with the return prevention piece 83 to constitute a regulating means.

The front surface of the bracket 85 is a sloped surface 85a that deviates downward and toward you. When attaching the back inner shell 21, the engaging portion 81 is guided by the inclined surface 85a of the bracket 85 and is elastically deformed and rotates forward once due to the downward movement of the back inner shell 21. When the arm part 80 is completely lowered, the arm part 80 returns and rotates due to the elastic restoring force, so that the engaging part 81 moves to the lower surface part of the inward protrusion 84, thereby holding the back inner shell 21 so that it cannot move upward. Ru.

In this embodiment, when the push operation part 82 of the movable catch 79 is pushed through the back cushion body 22, the engaging part 81 of the movable catch 79 is disengaged from the inward protrusion 84 of the fixed catch, and the support piece 86 The movable catch 79 is maintained in a free state in which the engaging portion 81 is disengaged from the inward protrusion 84 of the fixed catch by the regulating means consisting of the return prevention piece 83. Therefore, the user can use both hands to move the backrest 5 upwards and remove it from the back outer shell 10.

When installing a new backrest 5, as the male catches 62, 64 to 66 and the female catches 63, 67 to 69 move downward due to the guiding action, the movable catch 79 moves from the inclined surface of the bracket 85 in the fixed catch. 85a, it rotates toward you against the elasticity, and then, when it comes out of the bracket 85, it rotates back, and the engaging portion 81 abuts the inward protrusion 84 of the fixed catch from below. or in close proximity. Therefore, the backrest 5 is irremovably held by the back outer shell 10 simply by stacking it on the back outer shell 10 and sliding it downward.

The movable catch 79 engages with (approaches) the inward protrusion 84 of the fixed catch from below while it is not elastically deformed. Therefore, the movable catch 79 will not become free unless the back cushion body 22 is locally crushed and the push operation part 82 is moved back. Since the portion 82 does not move backward, an unexpected situation in which the movable catch 79 shifts to the free state when the chair is in use does not occur.

In the case of the second embodiment, a mark such as a circle may be printed or embroidered on a part of the skin material covering the backrest 5 located in front of the push operation part 82 as a mark of the bush position. It is.

Although the embodiments of the present invention have been described above, the present invention can be embodied in various other ways. For example, the present invention can also be applied to a seat. In the illustrated embodiment, the front seat outer shell is integrated with the back outer shell, but the two may be separated. Further, the seat support member may have a frame shape. As the engagement means, a combination of a dovetail groove and a rail-like dovetail tenon can also be employed.

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

3 Base 4 Seat 5 Backrest 9 Rear seat outer shell 10 Back outer shell as an example of a receiving member 11 Connection shaft (support shaft)
13 Seat inner shell 21 Back inner shell 22 Back cushion body 42 Multi-functional bracket provided on the back outer shell 48 Expandable push rivet 62, 64-66 Male catch constituting the engagement means 63, 67-69 The engagement means A female catch 76 as an example of a movement preventing means 79 A movable catch forming the movement preventing means 80 An arm portion 81 An engaging portion 82 A push operation portion 83 A return prevention piece forming the regulating means 84 An inward direction of the fixed catch Projection 85 Bracket configuring the fixed catch 86 Support piece configuring the regulating means

Claims (7)

A body support element including at least one of a seat, a backrest, and an elbow rest, and a receiving member supporting the body support element, the body support element having an inner shell attached to the receiving member; A chair comprising a cushion body stacked on the inner shell,
The inner shell is held stacked on the receiving member by an engaging means that functions when slid in a certain direction while stacked on the receiving member, and is provided on the outside of the cushion body. being held in an unremovable manner from the receiving member by a movement preventing means;
Chair. A chair comprising a backrest with a back cushion body arranged in front of the back inner shell, and a back outer shell arranged behind the back inner shell,
The back inner shell is held so as not to move forward relative to the back outer shell by fitting engagement means that moves the back inner shell downward while stacked on the back outer shell, and the cushion is held in an upwardly immovable manner by means for preventing movement provided on the outside of the body;
Chair. The engagement means is composed of a group of backward-facing male catches provided in multiple stages on the rear surface of the inner shell, and a group of forward-facing female catches provided in multiple stages on the front surface of the back outer shell.
A chair according to claim 2. A coupling bracket exposed below the back cushion body is provided at the lower end of the back inner shell as the movement preventing means, and the coupling bracket is coupled to the back outer shell by a fastener.
The chair according to claim 2 or 3. the coupling bracket is hidden from the front by the seat;
A chair according to claim 3. The coupling bracket is coupled to a bracket provided on the back outer shell with a fastener.
A chair according to claim 4. A backrest having a back cushion body arranged in front of the back inner shell, and a back outer shell arranged behind the back inner shell,
The back inner shell is held so as not to move forward relative to the back outer shell by fitting engagement means that moves the back inner shell downward while stacked on the back outer shell. A chair that is held so as not to be able to move upward by means for preventing movement provided in a hidden location at the lower end of the cushion body,
The movement prevention means includes a movable catch provided at the lower end of the back inner shell in a state hidden by the back cushion body, and a fixed catch provided on the back outer shell, and the movable catch is hidden by the back cushion body. When the movable catch is pushed from the front through the movable catch, the engagement between the movable catch and the fixed catch is released.
Chair.

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