JP3160564B2 - Chair - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair suitably used for office work or the like.

[0002]

2. Description of the Related Art Conventionally, as a structure of a portion for supporting a backrest of an office swivel chair on a back support rod, for example, a mounting plate is fixedly provided at an upper end portion of the back support rod, It is known that a shell constituting a backrest is fixed using a plurality of screws.

[0003]

However, in the case of such a structure, the operation of screwing a plurality of screws is required at the time of assembling, so that not only the assembling man-hour is increased, but also the cushion held by the shell is increased. There is a problem that a great deal of time is required for replacement work or the like when dirty or damaged. In recent years, given the growing awareness of environmental destruction,
There is a strong demand for recycling, and there is also a demand that a back support rod, which is a metal part, and a shell or cushion made of synthetic resin or the like be easily separated at the time of disposal.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a method in which a shell and an attachment member provided on a back support rod are connected by an engagement means having a supporting strength. The role of maintaining the engagement state of the means is separately performed by the relative operation preventing means, and only by releasing the constraint between the shell and the mounting member by the relative operation preventing means,
The shell can be detached from the mounting member.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A chair according to the present invention has a mounting member provided at the upper end of a back support rod, and a cushion is provided on the front surface of the mounting member.
Be comprised detachably mounted via a coupling mechanism backrest inner shell which holds down the shell
Formed with a pair of parallel ribs protruding from the back of
An attachment area is formed between the ribs, and the coupling mechanism engages with each other in the attachment area with relative movement in the surface direction of the shell with respect to the attachment member in the attachment area in the thickness direction of the shell with respect to the attachment member. And a relative movement preventing means for inhibiting the relative movement of the shell with respect to the mounting member in the surface direction and maintaining the engaged state of the engaging means. It is characterized by.

With such a configuration, for example,
By moving the shell in the surface direction to bring the engagement means into the engaged state, the shell cannot move in the thickness direction with respect to the mounting member, and is attached to the mounting member. Therefore, the longitudinal load acting on the backrest is
It is transmitted to the back support rod by the pressure receiving function of the mounting member or the separation preventing function of the engaging means. Therefore, it is possible to mount the shell in a state where the load can be transmitted to the mounting member of the back support rod by only a simple operation of moving the shell in the surface direction. In this case, when the external force acts on the backrest in the surface direction of the shell, the engagement state of the engagement means may be released. Is provided to prohibit relative movement of the shell with respect to the mounting member in the surface direction, so that the engagement state of the engagement means can be maintained. However, since the relative movement preventing means does not play a role of transmitting the load of the backrest to the back support rod, a means using a single screw or an elastic claw as described later must also fulfill the role. Is possible. Therefore, attachment and detachment can be facilitated, and the man-hour required for attaching and detaching the shell can be greatly reduced.

As a preferred embodiment described later, a case is described in which the shell is mounted on the mounting member with the flat portion formed in the mounting area being in contact with the front surface of the mounting member. The present invention is also applicable to an outer shell. As a preferred embodiment of the engagement means, a claw provided on the shell may be engaged with an edge of the mounting member.

When the shell is a molded article made of a synthetic resin, it is preferable that the claws are formed integrally with the shell.
For the backrest, the external force other than the normal load acting in the front-rear direction is expected to be the most likely external force from above, so the engaging end of the claw provided on the shell should be oriented downward. Preferably, the pawl is engaged with the upper edge of the mounting member from above.

When it is desired to exert a particularly high proof stress against an external force which tends to separate the shell from the mounting member, it is preferable that the claw is formed in a plate shape having two adjacent sides integrated with the shell. . As an embodiment which can be suitably used for a chair having a cushion integrated with a back seat, the shell is an inner shell for a backrest, and the backrest is provided on the back of the cushion in which the back and the seat are integrally formed. And an inner shell for a seat, which is separate from the inner shell, is added to a seat portion of the cushion, and after the inner shell for a backrest is fastened to a mounting member, the cushion An example is provided in which the seat inner shell can be mounted on a seat receiving member by utilizing a temporary deformation of a material.

[0010] In an embodiment which can be particularly preferably used for a chair provided with a cushion integrated with a backrest, the shell may include:
An inner shell for a backrest, in which the inner shell for the backrest is added to the back of the cushion in which the back and the seat are integrally formed, and the inner shell for the seat is added to the seat of the cushion. The seat inner shell is configured so that it can be fixed by pressing at least the rear part of the seat inner shell against the seat receiving member from above, and after attaching the backrest inner shell to the mounting member, the rear part of the seat inner shell is seated. One that can be fixed to the receiving member can be mentioned.

When it is desired to exhibit a high mounting strength even when a torsional force acts on the shell, the mounting member comprises a front plate and side plates extending rearward from both left and right edges of the front plate. It is preferable that the front surface of the front plate is brought into contact with the shell, and the outer surface of the side plate is brought into contact with or close to the shell. As a preferred embodiment of the relative movement preventing means, one screw is screwed into the shell by penetrating the mounting member, an elastic claw protruding from the back surface of the shell, and an engagement provided on the mounting plate. And those having recesses.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 4, the chair 1 is provided with a support structure (not shown) on a pillar 2 so as to be horizontally pivotable.
A seat plate 3 serving as a seat receiving member is fixed to the support structure, and a back support rod 4 is pivotally attached so as to be able to tilt backward. The cushion 6 is divided into a seat cushion 6A and a back cushion 6B.
And an inner shell 7 for the seat is attached to the lower surface of the seat cushion portion 6A of the cushion 6, and an inner shell 8 for the backrest is attached to the back of the back cushion portion 6B. The seat inner shell 7 is detachably fastened to the seat plate 3 via a hooking mechanism 9 and the backrest inner shell 8 is attachable / detachable to / from the mounting member 5 of the back support rod 4 via a coupling mechanism 10. Is bound to.

As shown in FIGS. 2, 3, 6 and 7, the back support rod 4 is constituted by two pipe members 4a. It is made of sheet metal rigidly connected to the upper end by welding or the like. More specifically, the mounting member 5 includes two pipe members 4 constituting the back support rod 4.
a, and a front plate 52 extending outward from both left and right edges of the channel portion 51.
And left and right side plates 53 extending rearward from the outer edges of each of the front plates 52, and are integrally formed by bending a sheet metal material. The side plate 5
3 is shorter than the front plate 52;
Has an upper edge and an outer edge that are open.

As shown in FIGS. 2 to 5, the inner shell 7 for the seat and the inner shell 8 for the backrest are separate products which are independent of each other, and are each made of synthetic resin and made of urethane or the like. The cushion 6 is attached to the lower surface and the rear surface of the cushion 6, respectively. The locking mechanism 9 is shown in FIG.
And a hooking claw 91 projecting in the vicinity of the front edge of the seat plate 3 so as to be bent rearward.
A bifurcated intermediate clamping claw 92 protruding in the vicinity of the side edge of the seat plate 3; a bifurcated rear edge clamping claw 93 protruding in the vicinity of the rear edge of the seat plate 3; The seat includes an axial hook 94 formed on the inner shell 7 for the seat corresponding to the hooking claw 91, the intermediate holding claw 92, and the trailing edge holding claw 93. Then, the hook 94 on the front edge side of the seat inner shell 7 is hooked on the hooking claw 91, and then the seat cushion 6A is pressed in the direction of the seat plate 3, so that the other hook 94 is held in the intermediate holding claw. The seat inner shell 7 is held on the seat plate 3 by being pressed into the recessed portion 92 and the recessed portion of the trailing edge holding claw 93.

As shown in FIGS. 2 to 4, the coupling mechanism 10 engages with each other with the relative movement of the inner shell 8 for the backrest with respect to the mounting member 5 in the plane direction, and the mounting of the inner shell 8 for the backrest. An engaging means 11 for preventing separation of the inner shell 8 for the backrest in the thickness direction from the member 5 and a relative operation for inhibiting the relative movement of the inner shell 8 for the backrest in the surface direction with respect to the mounting member 5 to maintain the engaged state of the engaging means 11. Operation inhibiting means 27.

More specifically, the engaging means 11 engages the first and second claws 12 and 13 provided on the inner shell 8 for the backrest with the edges of the mounting member 5. Things. That is, the inner shell 8 for the backrest
A mounting area 14 for receiving the mounting member 5 is formed in a central portion of the mounting member 5. The mounting area 14 is formed between the parallel ribs 15 protruding to the rear side. There are provided both side flat portions 17 in contact with the front surface. A first claw 12 having a tip edge directed downward is integrally provided at the center of the upper end portion of the mounting region 14, and a second claw having the tip edge directed downward is also provided on both sides of the upper end portion of the mounting region 14. Nail 13
Are provided integrally. The first claw 12 is bent in an inverted L-shape when viewed from the side and is formed integrally with the inner shell 8 for the backrest.
1 is engaged with the upper edge from above. Second
The claw 13 is of a plate shape and has two adjacent sides, ie,
The upper side 13a and the outer side 13b are integrated with the inner shell 8, and engage with the upper edge of the front plate 52 of the mounting member 5 from above.

The relative movement preventing means 27 is provided with the mounting member 5.
Screw insertion hole 5 near the lower end of the channel portion 51
4 and the inner shell 8 for the backrest.
A screw screw hole 18 is provided in the central plane portion 16 of the above, and one screw 19 is screwed into the screw screw hole 18 through the screw insertion hole 54. In addition, below the mounting area 14 of the inner shell 8 for the backrest,
The back support rod holding part 20 is formed integrally. The back support rod holding portion 20 has a holding groove 20a whose opening width is set to be slightly smaller than the internal width. The pipe member 4a of the back support rod 4 is formed in the holding groove 20a by utilizing the elastic deformation of the member. It can be detachably elastically engaged. FIG. 3 shows a state immediately before the pipe member 4a is elastically engaged with the holding groove 20a. A plurality of holding holes 21 for detachably holding the outer shell 23 are opened in the vicinity of the periphery of the inner shell 8 for the backrest.
That is, each of the holding holes 21 is provided in the inner shell 8.
Has a step portion having a large diameter on the front side thereof.
An elastic projection 22 integrally provided on the inner surface of the outer shell 23 is elastically engaged with the inner shell 1. Elastic projection 2
Numeral 2 is a cylindrical body having a large-diameter portion 22a having an arrowhead-shaped cross section at the front end, and has a plurality of slits 22b opened at the front end to facilitate elastic diameter reduction. . FIG. 8 is a central end view of the inner shell 8 for the backrest. The elastic projection 22 of the outer shell 23 is added to this drawing for explanation. FIG. 9 schematically shows the back surface of the inner shell 8 for the backrest.
4, 25 and 26 are ribs protruding toward the shell front side. These ribs 24, 25, and 26 have a U-shaped cross section, and also appear as grooves on the rear surface of the shell.
Some of the ribs 24, 25, and 26 are not shown in FIGS.

With such a structure, it can be assembled as follows. First, the first and second claws 12 and 13 of the inner shell 8 for the backrest are attached to the mounting member 5.
After being engaged with the upper edge portion, the inner shell 8 and the mounting member 5 are connected and fixed with one screw 19. Thereafter, after the front hook 94 of the seat inner shell 7 is engaged with the hooking claw 91, the seat cushion portion 6A of the cushion 6 is pressed from above, and the middle hook 94 and the rear hook 94 are separated. Each of them is elastically engaged from the upper side with the middle holding claw 92 and the rear edge holding claw 93 of the seat plate 3. In this state, the outer shell 23 for the backrest is attached by elastically engaging the elastic projections 22 with the holding holes 21 of the inner shell 8 for the backrest.

When it becomes necessary to replace the cushion 6, the reverse operation may be performed. That is, the outer shell 23 is removed by applying a certain or more rearward force to the outer shell 23, and then the seat cushion portion 6 is removed.
By lifting the rear of A, the rear hook 94 and the middle hook 94 are disengaged from the corresponding holding claws 93 and 92, and the front hook 94 is removed from the hook 91. In this state, the screw 19 is removed, the lower end side of the inner shell 8 for the backrest is pulled toward the seat, and the engaged state between the back support rod holding portion 20 and the back support rod 4 is released, and the inner shell 8 is removed. The first and second claws 12 of the engagement means 11 are lifted upward,
13 is detached from the mounting member 5.

Therefore, with such a structure, the cushion 6 can be removed and repaired or replaced by a simple operation. Also, the engagement means 11
First and second claws 1 provided on an inner shell 8 for a backrest
Since the members 2 and 13 are engaged with the edges of the mounting member 5, the mounting member 5 can be securely attached to the inner shell 8 with a simple configuration.

The inner shell 8 for the backrest is a molded product made of a synthetic resin, and the first and second claws 12 and 13 are formed integrally with the inner shell 8.
There is no need to provide the claws 12 and 13 separately, and the number of parts can be reduced. Further, the first nail 12
The first claw 12 has an engagement end oriented downward.
Is engaged with the upper edge portion of the mounting member 5 from above, so that a high strength against a load acting on the backrest from above can be exerted.

The attachment of the cushion 6 is of course not limited to the one described above.
For example, first, after the seat inner shell 7 is mounted on the seat plate 3, or at the same time, the first and second claws 12, 1, 1, which form the engaging means 11 of the back shell 8.
3 may be engaged with the upper edge of the mounting member 5 of the back support rod 4. If the inner shell 7 for seating and the inner shell 8 for backrest are separate bodies, the elastic deformation of the cushion 6 can be achieved even if the inner shell 7 for seating is completely fixed to the seat plate 3 first. Using the first and second claws 12, 1
It is possible to engage 3 with the upper edge of the mounting member 5.

The configuration of the engaging means 11 is not limited to the above-described one, and various modifications are possible. However, as in the above-described embodiment, the two sides 13a and 13b have the inner shell for the backrest. If the plate-shaped second claw 13 integrated with the inner shell 8 is used, the inner shell 8 can exert a high strength against a force to separate the inner shell 8 from the mounting member 5 in the thickness direction.

The relative movement preventing means 27 also has a single screw 19.
It is not limited to the one using, for example, an elastic claw protruding from the back surface of the shell, and an engagement recess provided in the mounting member, the shell is attached to the mounting member The elastic claw may be configured to engage with the engaging recess when the engaging means is engaged by the relative movement of the engaging means.

The configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0026]

According to the present invention, an attachment member is provided at the upper end of a back support rod, and an inner shell of a backrest holding a cushion on the front surface of the attachment member can be detachably attached via a coupling mechanism. A pair of flats on the back of the shell.
Protruding ribs are formed and between these ribs
An attachment area is formed in the attachment area, and the coupling mechanism is provided in the attachment area.
Engaging means for engaging with each other in accordance with relative movement of the shell to the mounting member in the surface direction and preventing separation of the shell from the mounting member in the thickness direction; A relative operation preventing means for inhibiting the operation and maintaining the engagement state of the engaging means.

With such a structure, there is provided a chair in which a cushion with a shell can be easily attached and detached without reducing the strength of attachment of the shell to a back support rod. It becomes possible. The shell can be suitably applied to the chair according to the present invention as long as the shell is attached to the attachment member with the flat portion formed in the attachment area being in contact with the front surface of the attachment member.

If the engaging means is such that the claw provided on the shell is engaged with the edge of the mounting member, the mounting member can be securely attached to the shell with a simple configuration.
If the shell is a molded product made of a synthetic resin and the claws are formed integrally with the shell, there is no need to separately provide claws, and the number of parts can be reduced. If the claw provided on the shell has the engagement end oriented downward and the claw is engaged with the upper edge of the mounting member from above, the load acting on the backrest from above can be reduced. High proof stress can be exhibited.

If the claw is of a plate shape in which two adjacent sides are integrated with the shell, a particularly high strength can be exerted against an external force which tends to separate the shell from the mounting member. The shell is an inner shell for a backrest, and the inner shell for the backrest is attached to the back of a cushion in which the back and the seat are integrally formed, and the inner shell for the cushion is formed separately from the inner shell. After the seat inner shell is attached, the seat back inner shell is fixed to the mounting member, and then the seat inner shell is mounted on the seat receiving member by utilizing the temporary deformation of the cushion material. As long as the chair can be assembled, the chair can be assembled by a simple operation.

Similarly, the shell is an inner shell for a backrest, and the inner shell for the backrest is attached to the back of the cushion in which the back and the seat are integrally formed. An inner shell was attached, and at least the rear portion of the seat inner shell was configured to be able to be fixed by pressing the seat back member from above, and the backrest inner shell was attached to a mounting member. If the rear portion of the seat inner shell can be fixed to the seat receiving member later, the chair can be assembled by a simple operation.

The mounting member comprises a front plate, and side plates extending rearward from both left and right side edges of the front plate,
If the front surface of the front plate is in contact with the shell and the outer surface of the side plate is in contact with or close to the shell, high mounting strength can be exhibited even when a torsional force acts on the shell. If the relative movement preventing means is one in which one screw is passed through the mounting member and screwed to the shell,
The relative movement of the mounting member can be reliably prevented simply and with a reduced number of parts.

On the other hand, the relative movement preventing means comprises an elastic claw protruding from the rear surface of the shell and an engaging recess provided on the mounting plate. If the elastic claw is configured to engage with the engaging recess at the stage when the engaging means is engaged, the operation of screwing a fastener such as a screw and a tool therefor are required. It becomes unnecessary and work becomes easy.

[Brief description of the drawings]

FIG. 1 is a side view showing one embodiment of the present invention.

FIG. 2 is a perspective view showing a main part in a state where the outer shell is removed.

FIG. 3 is an exploded perspective view showing the main part.

FIG. 4 is a perspective view showing the main part.

FIG. 5 is an exploded perspective view of the same.

FIG. 6 is a plan view showing a state where the mounting member is mounted on a back support rod.

FIG. 7 is a front view corresponding to FIG. 6;

FIG. 8 is a diagram schematically showing the back surface of the inner shell for the backrest.

FIG. 9 is a central end view of the inner shell for the backrest.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Chair 3 ... Seat receiving member (seat plate) 4 ... Back support rod 5 ... Mounting member 52 ... Front plate 53 ... Side plate 6 ... Cushion 7 ... Inner shell for seat 8 ... Inner shell for backrest 10 ... Coupling mechanism 11 ... Coupling means 12 ... nail (first nail) 13 ... nail (second nail) 19 ... screw 27 ... relative movement preventing means

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tomokazu Murakami 6-1-1, Oimazato-Minami, Higashi-Nari-ku, Osaka KOKUYO Co., Ltd. No. KOKUYO Co., Ltd. (56) References JP-A-8-10084 (JP, A) JP-A-56-148312 (JP, A) JP-A-2-47945 (JP, U) JP 6-55177 (JP) JP, B2) JP 58-1260 (JP, Y2) JP 58-4027 (JP, Y2) JP 7-21154 (JP, Y2) (58) Fields studied (Int. Cl. ⁷ , (DB name) A47C 7/42 A47C 7/40 A47C 3/025 A47C 5/12 A47C 7/00 A47C 7/02

Claims (11)

(57) [Claims] An inner member of a backrest having a mounting member provided at an upper end portion of a back support rod, and a cushion being held on a front surface of the mounting member.
Be comprised detachably mounted via a coupling mechanism shells, butt a pair of parallel ribs on the back of the shell
And a mounting area between these ribs.
Engagement means for forming the coupling mechanism in the mounting region , wherein the coupling mechanism engages with each other in a surface direction relative to the mounting member and prevents the shell from separating from the mounting member in the thickness direction. A chair for preventing relative movement of the shell with respect to a mounting member in a surface direction and maintaining relative engagement of the engagement means. 2. A flat shell formed in a mounting area of the shell.
The chair according to claim 1, wherein the surface portion is attached to the mounting member with the surface portion being in contact with the front surface of the mounting member. 3. The chair according to claim 1, wherein said engaging means engages a claw provided on the shell with an edge of the mounting member. 4. The shell is a molded article made of a synthetic resin,
The claw is formed integrally with the shell.
3. The chair according to 3 . 5. The shell according to claim 3, wherein the claws provided on the shell have engagement ends directed downward, and the claws are engaged with the upper edge of the mounting member from above. Chair. 6. The chair according to claim 4, wherein the claws are plate-shaped with two adjacent sides integrated into a shell. 7. The cushion according to claim 1, wherein the shell is an inner shell for a backrest, and the inner shell for the backrest is attached to a back of a cushion in which the back and the seat are integrally formed, and the inner shell is attached to a seat of the cushion. And a seat inner shell formed separately from the seat back inner shell. After the back inner shell is connected to the mounting member, the seat inner shell is seated by utilizing the temporary deformation of the cushion material. 6. The chair according to claim 5, wherein the chair can be mounted on a member. 8. The cushion according to claim 1, wherein the shell is an inner shell for a backrest, and the inner shell for the backrest is provided on the back of a cushion in which the back and the seat are integrally formed. A shell is attached, and at least the rear portion of the seat inner shell is configured to be able to be fastened to the seat receiving member by pressing the seat shell from above, and after attaching the backrest inner shell to the mounting member, The chair according to claim 5, wherein a rear portion of the seat inner shell can be fixed to the seat receiving member. 9. A mounting member comprising: a front plate; and side plates extending rearward from left and right side edges of the front plate, wherein a front surface of the front plate is brought into contact with the shell and a side plate is provided. 5. The chair according to claim 4, wherein the outer surface of the chair abuts or approaches the shell. 10. The relative movement preventing means is formed by screwing one screw through the mounting member and screwing it to the shell.
The described chair. 11. A relative movement preventing means comprising an elastic claw projecting from a back surface of a shell and an engaging recess provided on a mounting member, wherein the shell is moved relative to the mounting member. The chair according to claim 1, wherein the elastic claw is configured to engage with the engagement recess when the engagement means is engaged.