JP3594334B2 - Chair - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a chair suitably used in an office or the like.
[0002]
[Prior art]
Conventionally, as a chair integrated with a back seat, for example, an L-shaped base shell in a side view formed by integrally forming a seat corresponding portion and a backrest corresponding portion is provided, and the seat is detachably attached to the base shell via an engaging portion. Chairs with a backrest are known. Among these, the front engaging portion that connects the vicinity of the front portion of the seat corresponding portion of the base shell and the vicinity of the front portion of the seat is a striated body in which a rearward-facing claw projecting from the upper surface of the base shell is routed to the lower surface of the seat. It is structured to prevent the seat from being lifted by engaging with the like. Further, another engaging portion, for example, an engaging portion for connecting the vicinity of the rear portion of the base shell corresponding to the seat and the vicinity of the rear portion of the seat is located between the forks of the bifurcated engaging element protruding from the base shell. In general, a so-called grip structure is used in which the striated body drawn around the lower surface of the seat or the back surface of the back is sandwiched and mounted.
[0003]
[Problems to be solved by the invention]
However, with such a configuration alone, there is a problem that the base shell and the seat are easily separated from each other at the front engagement portion. That is, such a back-seat-integrated shell is generally formed of a resin-integrated product as a whole and has elasticity, and the cushioning material and the like constituting the seat are made of a flexible material. Therefore, when sitting on a seat or leaning on a backrest, the base shell flexes and deforms, or the seat is displaced, and the front part of the seat is displaced rearward relative to the base shell. Easy to do. In such a case, simply engaging the rearwardly-facing claw protruding from the base shell with the striated body formed on the lower surface of the seat as in the related art will not allow the claw when the front portion of the seat is displaced rearward. And the engaging element dissociate relatively easily. Therefore, in this kind of chair, there is a problem that the front portion of the seat is easily peeled off from the base shell, and it is desired to take some measures to enhance reliability and durability.
[0004]
An object of the present invention is to preferably solve such a problem.
[0005]
[Means for Solving the Problems]
The present invention employs the following configuration in order to achieve the above object. That is, the chair according to the present invention includes an L-shaped base shell formed by integrally molding a portion corresponding to a seat and a portion corresponding to a backrest, and the seat and the backrest are detachably attached to the base shell via an engaging portion. in that to attach the pawl for opening the front engaging portion, downward after projecting from the upper surface of the base shell for connecting the front near the front near the seat of the seat corresponding portion of the base shell, a cushion An engaging element formed at a position where the auxiliary shell is disposed at a position attached to the lower surface of the material and at a position engaging with the claw; and an auxiliary element formed at an upper surface of the base shell and near the engaging element. An upright piece protruding from a position abutting the lower surface of the shell and biasing the front portion of the seat upward and forward, and the lower surface of the auxiliary shell has a shape corresponding to the shape of the upright piece. Features that you are molded To.
[0006]
As a specific embodiment of the upright piece, there is a rib which rises gently upward and rearward.
[0007]
Specific embodiments of the engaging element include an opening window formed on the lower surface of the seat and a striated body held on the lower surface of the seat.
[0008]
It is effective that the engaging element is formed integrally with the auxiliary shell .
[0009]
[Action]
With such a configuration, the disengagement of the base shell and the seat in the front engagement portion is effectively prevented. That is, when the front engaging portion of this chair engages the engaging element formed on the seat with the claw projecting from the base shell, the upstanding piece projecting from the base shell contacts the lower surface of the seat. The seat is biased forward and upward. At this time, the engaging element integrally formed on the seat is also pulled upward and forward, but the claw is opened rearward and downward, in a direction in which the engaging element and the claw are more deeply engaged. They will coincide, and will act as a deterrent to prohibit rearward displacement of the seat. Therefore, according to the present invention, the mounting state of the front engagement portion becomes better as compared with the structure in which the claw and the engagement element are simply engaged, and the front portion of the seat can be seated or leaned on the backrest. In the event that the user attempts to displace rearward relative to the base shell, the claw and the engaging element can be effectively prevented from being dissociated, and the front portion of the seat can be stably held in the base shell. it can.
[0010]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0011]
As shown in FIG. 1, the chair includes a leg 1, an outer shell 3 as a base shell attached to the leg 1 via a tilting device 2, a seat 4 and a backrest mounted on the front side of the outer shell 3. 5 is provided.
[0012]
More specifically, the leg 1 has a leg post 12 erected at the center of a leg blade 11, and a tilting device 2 is attached to the upper end of the leg post 12.
[0013]
The tilting device 2 includes a seat receiving portion 21 that supports the load of the seat 4 and a back support rod 22 that supports the load of the backrest 5, and the load is applied to the back support rod 22 via the backrest 5. When actuated, the entire seat receiving portion 21 is slightly inclined backward while advancing slightly forward, so that a seated person can take a comfortable posture.
[0014]
The outer shell 3 has an L-shape in a side view in which the seat corresponding portion 31 and the backrest corresponding portion 32 are integrally formed of resin. The lower surface of the seat corresponding portion 31 is attached to the upper surface of the seat receiving portion 21 so that the outer shell 3 can be appropriately positioned. Are fastened using screws. An opening 33 is provided near the boundary between the seat corresponding portion 31 and the backrest corresponding portion 32 of the outer shell 3. The back support rod 22 extending rearward from the tilting device 2 is connected to the opening 33. The back support rod 22 is inserted into the inner surface of the outer shell 3 via a pin, and the back corresponding portion 32 of the outer shell 3 is fastened to the tip of the back support rod 22 using screws. That is, the outer shell 3 has its seat corresponding portion 31 supported by the pillar 12 via the seat receiving portion 21 of the tilting device 2, and the backrest corresponding portion 32 supported by the pillar 12 via the back support rod 22. In addition, the entire outer shell 3 has a function as a structural member that supports the load acting on the seat 4 and the backrest 5, and the entire outer shell 3 can be flexibly deformed by following the behavior of the tilting device 2 described above. I have.
[0015]
The seat 4 and the backrest 5 are, for example, integrally formed. As shown in FIGS. 2 and 3, the seat 4 and the backrest 5 are arranged at a position where a cushion material 61 formed of urethane foam is attached to the lower surface and the back surface of the cushion material 61. An auxiliary shell 62 made of resin and a skin 63 fixed to the front surface and the upper surface of the cushion material 61 by a suitable means such as a tacker or a glue at a position where the periphery thereof is wrapped around the rear surface of the auxiliary shell 62. Is provided. The auxiliary shell 62 has an L-shape in side view having portions corresponding to the seat corresponding portion 31 and the backrest corresponding portion 32 of the outer shell 3. As shown in FIGS. 1 and 2, the engaging elements 62a to 62g formed on the rear surface and the lower surface are engaged with the engaging elements 34a to 34g formed on the front surface and the upper surface of the corresponding outer shell 3.
[0016]
In such a configuration, in the present embodiment, particularly, as shown in FIG. 3, the front engagement portion A that connects the vicinity of the front portion of the seat corresponding portion 31 of the outer shell 3 and the vicinity of the front portion of the seat 4 is provided. A pair of claws 34g projecting from the upper surface of the outer shell 3 near both edges in the width direction and thereafter opening downward, and an opening window 62g serving as an engagement element formed on the auxiliary shell 62 at a position corresponding to the claws 34g. And a rib 34h which is an upright piece protruding from the upper surface of the outer shell 3 and in contact with the lower surface 6a of the auxiliary shell 62 on the inner side in the width direction of the left and right opening windows 62g. The claw 34g is formed integrally with or attached to the outer shell 3 and is provided with a slight elasticity capable of tilting in the front-rear direction. The opening window 62g is formed in the bottom wall 63 which is suspended obliquely downward from the auxiliary shell 62 in order to realize the engagement with the claw 34g at a low position, and substantially engages with the claw 34g. The opening edge portion 62g1 to be performed is slightly raised in a protruding state. Rib 34h is plays a function of biasing the front portion of the seat 4 upwards via the front auxiliary shell 62, and forms a streamlined shape which gradually rises toward the upper rear Therefore, the rib 34h The lower surface 6a of the auxiliary shell 62 is also formed into a shape that gradually rises rearward and upward in accordance with the shape.
[0017]
The engaging elements 62b to 62f are striated bodies formed on the back surface or the lower surface of the auxiliary shell 62, and the corresponding engaging elements 34b to 34f on the outer shell 3 side have a forked shape into which the engaging elements 34b to 34f are fitted. The engagement is realized by a gripping structure. The engagement element 62a is a downward opening window protruding from the upper rear surface of the auxiliary shell 62, and the engagement element 34a formed at a corresponding position on the outer shell 3 side forms an upward claw inserted therein. I have.
[0018]
In this embodiment, the procedure for attaching the seat 4 and the backrest 5 to the outer shell 3 via the auxiliary shell 62 is mainly based on the following two methods. First, a press-fitting method is used, in which all or almost all of the engagement elements 62a to 62f and the engagement elements 34a to 34f of the engagement parts other than the front engagement part A are engaged. The open window 62g is pressed against the claw 34g from above as shown in FIG. Then, when it comes to a certain position, the claw 34g comes into contact with the opening edge portion 62g1 of the opening window 62g and is urged as shown in FIG. Evacuate in a warped state. Then, when the rearward-facing claw 34g passes through the opening window 62g in this state, the claw 34g returns to the original posture, and the tip of the claw 34g engages with the opening edge 62g1 as shown in FIG. At this time, the hatched rib 34h in FIG. 9C abuts against the lower surface 6a of the auxiliary shell 62 and urges the shell 62 upward and forward as indicated by the arrow. , So that the claw 34g and the opening edge 62g1 are more deeply engaged with each other. The second is a slide method in which the front engagement portion A is engaged first. That is, as shown in FIG. 5 (a), when the cover is put from above the claw 34g so as to press the periphery of the opening window 62g and pressed so as to sneak forward at that position, the opening as shown in FIG. The opening edge 62g1 of the window 62g is engaged with the claw 34g from the rear lower side, and the engagement of the front engagement portion A is completed as shown in FIG. Thereafter, all of the engaging elements 62a to 62f and the engaging elements 34a to 34f of the other engaging portions are engaged, and the mounting of the seat 4 and the backrest 5 is completed. At this position, the engagement between the claw 34g and the opening edge 62g1 is also ensured by the action of the rib 34h. That is, the state after mounting by any method is the same.
[0019]
In this state, the disengagement of the outer shell 3 and the seat 4 at the front engagement portion A can be effectively prevented. That is, the front engaging portion A of the chair projects from the outer shell 3 when the claw 34g projecting from the outer shell 3 is engaged with the opening edge 62g1 of the opening window 62g formed in the auxiliary shell 62. The ribs 34h contact the lower surface 6a of the auxiliary shell 62 to urge the seat 4 forward and upward through the auxiliary shell 62. Therefore, the opening window 62g formed integrally with the auxiliary shell 62 is also pulled upward and upward, and the direction thereof coincides with the direction in which the opening edge 62g1 and the claw 34g are more deeply engaged as described above. A higher engaging force can be exhibited as compared with a structure in which the claw 34g and the opening window 62g are engaged. In addition, the rib 34h has a shape that rises gently upward and rearward, and the lower surface 6a of the auxiliary shell 62 is recessed corresponding to the shape of the rib 34h. Relatively rearward displacement is prohibited by the rib 34h, and in cooperation with the claw 34g, a so-called fitted state is achieved. For this reason, according to the present embodiment, even if the front part of the seat 4 is relatively displaced rearward with respect to the outer shell 3 by sitting on the seat 4 or leaning against the backrest 5, the claw 34 g and the opening window 62 g are displaced. Dissociation can be effectively prevented, and the front portion of the seat 4 can be stably held in the outer shell 3. Therefore, the problem that the front portion of the seat 4 is separated from the outer shell 3 is significantly reduced, and the reliability and durability of the entire chair can be drastically improved.
[0020]
The specific configuration and cross-sectional shape of each part are not limited to those in the illustrated embodiment. For example, in the above embodiment, an auxiliary shell is attached to the back of the seat and the backrest, an opening window is provided in the auxiliary shell, or the auxiliary shell is used as an additional surface, but instead of the auxiliary shell, urethane foam is used at the time of urethane foam molding. The hard layer may be partially formed by using the above method, and the opening may be provided in the hard layer, or the hard layer may be used as an additional surface of the rib. Alternatively, a striated body may be drawn around the lower surface of the seat in place of the opening window, and the striated body may be engaged with the claw of the base shell. Further, the standing pieces are not necessarily limited to the ribs. Furthermore, in the above embodiment, the outer shell is applied to a chair using as a structural member.However, when the inner shell is a structural member and is applied to a chair whose appearance is adjusted by the outer shell, the inner shell is used as a base shell. The present invention can be applied. In addition, the specific configuration of each part can be variously modified without departing from the spirit of the present invention.
[0021]
【The invention's effect】
As described in detail above, the chair of the present invention has a front engagement portion that connects the vicinity of the front portion of the seat corresponding portion of the base shell and the vicinity of the front portion of the seat, and projects downward from the upper surface of the base shell after projecting therefrom. An opening claw, an engagement element formed at a position on the lower surface of the seat where the auxiliary shell is provided at a position attached to the lower surface of the cushion material and engaging with the claw, and an upper surface of the base shell; An upright piece protruding from a position abutting the lower surface of the auxiliary shell near the engagement element and urging the front portion of the seat upward and forward, and the lower surface of the auxiliary shell is formed in the shape of the upright piece. It is molded into a corresponding shape . Therefore, the engaging force of the front engaging portion is increased by the standing piece, and the relative displacement of the seat with respect to the base shell to the rear is prohibited. As a result, a structure in which the claw and the engaging element are simply engaged is provided. Not only does the front engagement part become better installed, but also when the front part of the seat tries to displace rearward relative to the base shell by sitting on the seat or leaning against the backrest. In addition, disengagement of the pawl and the engaging element can be effectively prevented, and the front portion of the seat can be stably retained in the base shell. In this way, the present invention has an excellent effect of dramatically improving the reliability and durability of the chair as compared with the conventional structure.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment of the present invention.
FIG. 2 is a side sectional view showing a seat and a backrest of the embodiment.
FIG. 3 is an exploded perspective view showing a front engagement portion of the embodiment.
FIG. 4 is an exemplary view showing a procedure of mounting the front engagement portion according to the embodiment.
FIG. 5 is an exemplary view showing another mounting procedure of the front engagement portion of the embodiment.
[Explanation of symbols]
A: front engagement part 3: base shell (outer shell)
4 seat 5 backrest 6a bottom surface 31 seat corresponding portion 32 backrest corresponding portion 34g claw 62 auxiliary shell 62g engagement element (opening window)
34h ... Standing piece (rib)

Claims (5)

In a chair provided with an L-shaped base shell formed by integrally molding the seat corresponding portion and the backrest corresponding portion, and the seat and the backrest are detachably attached to the base shell via an engaging portion.
A front engagement portion that connects the vicinity of the front portion of the seat corresponding portion of the base shell and the vicinity of the front portion of the seat is attached to a claw that projects from the upper surface of the base shell and then opens downward and a lower surface of the cushion material. An engaging element formed at a position on the lower surface of the seat where the auxiliary shell is disposed at the position and engaging with the claw; and a position at the upper surface of the base shell and abutting on the lower surface of the auxiliary shell near the engaging element. And an upright piece for urging the front portion of the seat upward and forward, and the lower surface of the auxiliary shell is formed in a shape corresponding to the shape of the upright piece. And chair. 2. The chair according to claim 1, wherein the upstanding piece is a rib that rises gently upward and rearward. The chair according to claim 1, wherein the engaging element is an opening window formed on a lower surface of the seat. The chair according to claim 1, wherein the engagement element is a striated body held on the lower surface of the seat. The chair according to claim 3 or 4, wherein the engagement element is formed integrally with the auxiliary shell .

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