JPH084547B2 - Chair with backrest - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a chair with a backrest in which a seat and a backrest are integrally formed by using an inner shell and an outer shell.

[Prior Art] Conventionally, as this type of chair with a backrest, an L-shaped inner shell having a seat-corresponding portion and a backrest-corresponding portion is provided, and an outer shell is attached to a lower surface and a back surface of the inner shell. It has been known.

Therefore, the conventional one is attached to the inner shell by using a plurality of bolts, etc. of the lower surface side outer shell that covers the lower surface of the seat corresponding portion of the inner shell, and separates the back surface of the portion corresponding to the backrest of the inner shell. The outer shell on the back side is attached by elastic engagement between the engaging protrusion and the engaging hole.

The bolt for fixing the lower surface side outer shell to the inner shell is usually screwed from a direction perpendicular to the outer surface of the lower surface side outer shell.

[Problems to be Solved by the Invention] However, in such a case, when the outer shell is curved and the outer surface thereof is not flat, the axes of the bolts are not aligned in parallel. For this reason, it is not possible to attach and detach the multi-axis type driver to screw a plurality of bolts at the same time, which hinders the efficiency of the assembly work.

Also, with this alone, since only the bolt fastening part of the outer shell is fixed to the lower surface of the inner shell, if there are few fastening points with bolts, in the intermediate part other than the fastening point, There is a problem that a vertical gap is apt to occur between the edge of the outer shell and the edge of the inner shell.

Further, in such a joint structure, a problem occurs when the outer shell is L-shaped in a side view in which the seat corresponding portion and the backrest corresponding portion are integrally molded.
That is, when the inner shell and the outer shell are both L-shaped when viewed from the side, in order to allow the backrest to be appropriately elastically deformed rearward, when the backrest is tilted rearward, the backrest of the outer shell is supported. It is desirable that a part of the inner shell is slightly displaced downward with respect to the backrest corresponding part. However,
With this configuration, when the backrest is tilted backward, the seat-corresponding portion of the outer shell tends to move forward relative to the seat-corresponding portion of the inner shell. Therefore, a tilting force acts on the bolt screwed from the direction perpendicular to the outer surface of the outer shell. Such a tilting force repeatedly acts on the bolt every time the backrest is tilted, so that the bolt is easily loosened. In particular, when the bolt is screwed into a screw hole formed directly in the resin inner shell, the screw hole is deformed and the bolt is easily removed.

An object of the present invention is to solve all such problems.

[Means for Solving the Problems] The present invention is intended to achieve the above objects. It adopts the following configuration.

That is, the chair with a backrest according to the present invention, as schematically shown in FIG. 1, has an L-shaped inner shell (in side view) formed by integrally molding a seat-corresponding portion (21) and a backrest-corresponding portion (22). The seat and the backrest are integrally configured by using 2) and the outer shell (3) which is L-shaped in side view and which is formed by integrally molding the seat corresponding part (31) and the backrest corresponding part (32). Said inner shell (2)
A plurality of pins (251, 252, 253) substantially perpendicular to an imaginary plane (P) connecting the front edge (4a) of the seat and the upper edge (5a) of the backrest on the lower surface of the seat-corresponding part (21). 254) projecting with their axes (R) aligned in parallel and corresponding to the pins (251, 252, 253, 254) on the upper surface of the seat corresponding portion (31) of the outer shell (3). Tube part (351, 3
52, 353, 354) and the axis (T) of the pin (251, 2)
52, 253, 254) and the projections are provided so as to match the axis lines (R), and the pins (251, 252, 253, 254) are fitted into the respective cylinder parts (351, 352, 353, 354). The outer shell (3) to the inner shell (2), and the outer shell (3) is attached to the inner shell (2) with a bolt (355) screwed from a direction parallel or matching the axis (R, T). It is characterized by being attached to 2).

In order to make the fastening structure with the bolt (355) rational, a screw hole along the axis (R) is provided on the tip surface of the specific pin (251, 254) and the pin (251, 254) is also provided.
A bolt insertion hole that opens to the lower surface side of the outer shell 3 is bored in the outer end of the cylindrical portion (351, 354) that fits into the screw hole, and is screwed into the screw hole of the pin (251, 2549) through the bolt insertion hole. It is preferable to fix the seat-corresponding portion (31) of the outer shell (3) to the lower surface of the inner shell (3) by the attached bolts (355).

[Operation] According to such a configuration, as shown in FIG. 2, the inner shell (2) stably placed face down on a predetermined workbench is simply covered with the outer shell (3) from directly above. , Pins (251, 252, 25) of the inner shell (2)
3, 254), and the outer shell 3's cylinder (351, 352, 35)
3, 354) can be engaged. And the axis (S) of the bolt (355) also has its pins (251, 252, 253, 25).
4) and the cylindrical parts (351, 352, 353, 354) are made to correspond to the engaging direction, so that they are all parallel. for that reason,
It is also easy to screw all the bolts (355) at the same time at the same time by the multi-axis type screw fastening device in which the drivers arranged in parallel are simultaneously rotated.

In addition, the pins (251, 252, 253, 254) and the tubular portion (35
1, 352, 353, 354) is an angle of about 45 ° with respect to the joining line of the seat corresponding part (21) of the inner shell (2) and the seat corresponding part (31) of the outer shell (3). Engage along the formed axis (R, T). Therefore, even in the part where the bolt (355) is not fixed, the pin (252,
It is possible to prevent the vertical gap from being formed between the joint edges of the inner shell (2) and the outer shell (3) by the engagement of the cylindrical portion (352, 353) with the tubular portion (352, 353).

Furthermore, when the seat-corresponding portion (31) of the outer shell (3) tries to move forward with respect to the seat-corresponding portion (21) of the inner shell (2) by tilting the backrest backward, its behavior Is the cylinder (351, 352, 353, 354)
And the pins (251, 252, 253, 254) work to deepen the fitting. Therefore, only the force in the axis (S) direction acts on the bolt (355) for fixing the seat-corresponding portion (31) of the outer shell (3) to the seat-corresponding portion (21) of the inner shell (2). As a result, the falling moment does not work repeatedly.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 3 to 15.

As shown in FIG. 3, the chair with a backrest according to this embodiment has a support unit 1 on which a seat 4 and a backrest 5 which are integrally formed by using an inner shell 2 and an outer shell 3 are arranged.

As shown in FIG. 3, the support unit 1 includes a base 11 formed by radially projecting leg blades, a pedestal 12 standing upright at the center of the base 11, and a pedestal 12 continuously connected to the upper end of the pedestal 12. And the supporting base 13 described above. The balance members 101 are axially attached to both sides of the support base 13. Balance member 101
As shown in FIGS. 4 and 5, is an elongated plate-like member extending in the front-rear direction, and an intermediate portion thereof is pivotally attached to the support base 13 via a shaft 102. Then, the rear ends of the left and right balance members 101 are rigidly attached to each other by a connecting fitting 103,
The back support rod 104 extends rearward and upward from the connecting portion. A seat receiving frame 105 is arranged on the support base 13. The front end portion of the seat receiving frame 105 is connected to the front end portion of the support base portion 13 via the front link member 106, and the rear end portion thereof is connected to the rear end portion of the both balance members 101 via the rear link member 107. are doing. That is,
The upper pivot ends of the left and right front link members 106 are pivotally attached to the front ends of the seat receiving frames 105 via shafts 108, and the lower pivot ends of the front link members 106 are attached to the support base 13 and the shaft 109. Is pivoted through. Further, the upper pivoting ends of the left and right rear link members 107 are pivotally attached to the rear end portion of the seat receiving frame 105 via shafts 111, and the lower pivoting ends of the rear link members 107 are attached to the rear of the balance member 101. It is pivotally attached to the end through a shaft 112.
Then, long holes 113 extending in the front-rear direction are provided at the front ends of the both balance members 101, and the long holes 113 are continuously slidably connected to a shaft 110 provided at a rear pivot point of the front link member 106. ing. An intermediate shaft 11 is provided at an intermediate portion of the side wall of the support base 13.
A main spring 115 is stretched between the intermediate shaft 114 and the shaft 108 to elastically bias the seat receiving frame 105 rearward. Further, an auxiliary spring 116 is wound around the shaft 109 so that the seat receiving frame 105 can be biased in the same direction by the auxiliary spring 116. Auxiliary spring 11
One end of 6 is locked by a spring force adjustment mechanism 117, and the biasing force of the auxiliary spring 116 can be adjusted by changing the locking position.

Then, as shown in FIGS. 4 and 5, horizontally long brackets 118 and 119 are fixed to the front end of the seat receiving frame 105 and the upper end of the back support rod 104, respectively.
The inner shell 2 is attached to 8 and 119.

The inner shell 2 is, as shown in FIGS. 4 to 7,
The seat-corresponding portion 21 and the backrest-corresponding portion 22 are integrally molded, and are L-shaped in a side view, and are made of an elastically deformable synthetic resin such as polypropylene. Seat corresponding part 21
Has a shape in which the left and right side edges 21b and the central portion are slightly raised, and a nut 23 is fixed to the front portion of the side edge vicinity portion 21s. Then, the horizontal bracket 118
The inner shell 2 is seated on the seat receiving frame 10 by means of bolts (not shown) which are passed through both ends of the
5 is attached. In this embodiment, the nut 25 is fixed to the front portion of the central portion of the inner shell 2, and the auxiliary bolt (not shown) screwed into the nut 25 by penetrating the front end portion of the seat receiving frame 105. The mounting strength of the inner shell 2 is increased. The backrest-corresponding portion 22 has a shape in which the left and right side edges 22a are slightly curved in the forward direction, and a nut 26 is fixedly attached to both side edge neighboring portions 22d at a position substantially the same height as the so-called backrest point. Then, the bolt 27 that penetrates the vicinity of both ends of the horizontally long bracket 119.
The inner shell 2 is connected to the back support rod 104 by being screwed onto the nut 26. The boundary portion 28 between the seat-corresponding portion 21 and the backrest-corresponding portion 22 of the inner shell 2 has a degree of curvature in the direction in which the left and right side edges 28a are in the forward direction set to substantially zero, and has a semi-arcuate shape in side view. However, it is curved so that it bulges backward. And this boundary part
28 is provided with two parallel slits 29 extending vertically. The lower ends 29a of these slits 29 extend to the rear of the seat-corresponding portion 21, while the upper ends 29b thereof extend to a position higher than the backrest point of the backrest-corresponding portion 22, and between these slits 29. The positioned portion 22b is projected forward.

On the other hand, the outer shell 3 includes the outer shell 3 shown in FIGS.
As shown, seat-corresponding portion 31 and backrest-corresponding portion 32
Is an L-shaped side view formed by integrally molding and, and is made of an elastically deformable synthetic resin such as polypropylene. The seat-corresponding portion 31 has a spherical shape that bulges downward, and has a rectangular opening 33 that extends in the front-rear direction in the center thereof. The backrest-corresponding portion 32 has a shape in which the left and right side edges 32a are curved in the forward direction.
It is set so that the degree of curvature increases as it approaches the backrest point from b. The degree of curvature near the backrest point of the outer shell 3 is larger than the degree of curvature of the inner shell 2 at the same cross-sectional position. In the boundary portion 34 between the seat corresponding portion 31 and the backrest corresponding portion 32 of the outer shell 3, the degree of curvature in the direction in which the left and right side edges 34a protrude is set to substantially zero, and a semi-circular shape in a side view is shown. It is curved so as to bulge backward. Then, the portion near the base end of the backrest corresponding portion 32 in the outer shell 3, that is, the upper portion of the boundary portion 34, is set to the backrest corresponding portion 22 in the inner shell 2.
Is close to the proximal end portion, that is, the upper portion of the boundary portion 28.

The mounting structure of the outer shell 3 to the inner shell 2 is as follows. First, the front edge vicinity portion 31f and the side edge vicinity portion 31s of the seat corresponding portion 31 of the outer shell 3 can be externally removed to the front edge vicinity portion 21f and the side edge vicinity portion 21s of the seat corresponding portion 21 of the inner shell 2. It is screwed on. That is, the lower surface 2a of the inner shell 2, more specifically, the lower surface of the front edge vicinity portion 21f and the lower surface of the side edge vicinity portion 21s of the seat-corresponding portion 21, as shown in FIGS. Edge 4a
And a plurality of pins 251, 252, 253, 254 that are substantially perpendicular to an imaginary plane P that connects the upper edge 5a of the backrest 5 and the axis R of the pins are arranged in parallel and project from the upper surface of the outer shell 3. 3a, specifically, the front edge vicinity portion 31 of the seat-corresponding portion 31
As shown in FIG. 6, FIG. 8 and FIG. 9, on the upper surface of f and on the upper surface of the side edge vicinity portion 31s, the cylindrical portions 351, 352, 353, 354, the axis T of which is the pins 251, 252, 253, 254 are projected so as to match the axis R of each, and these cylindrical portions 351, 352, 353, 3
The outer shell 3 is attached to the inner shell 2 by fitting the pins 251, 252, 253, 254 to 54. Then, the seat-corresponding portion 3 of the outer shell 3 is fixed by a bolt 355 screwed from a direction coinciding with the axes R and L.
1 is attached to the seat-corresponding part of the inner shell 2. Specifically, the screw holes 251a and 254a along the axis R are provided on the tip surfaces of the specific pins 251, 254, and the pins 251, 2
The outer shell 3 is attached to the outer ends of the tubular portions 351 and 354 that fit with the 54.
Bolt insertion holes 351a, 354a opened on the lower surface 3b side of the pin 25 are formed through the bolt insertion holes 351a, 354a.
The seat-corresponding portion 31 of the outer shell 3 is fixed to the seat-corresponding portion 21 of the inner shell 2 by means of bolts 355 screwed into the screw holes 251a and 254a of 1,254.

On the other hand, the boundary portion 34 of the outer shell 3 is not connected to the boundary portion 28 of the inner shell 2.

Further, the side edge vicinity portion 32c and the upper edge vicinity portion 32d of the backrest corresponding portion 32 of the outer shell 3 have an engaging structure by a claw. Specifically, Fig. 6, Fig. 10, Fig. 11 and Fig. 13
As shown in FIG. 14 and FIG. 14, the upward claw 301 bent in an L shape in a side view in the side edge vicinity portion 32c of the outer shell 3, the first inward claw 302 having an undercut portion inside, and A second inward claw 303 having an undercut portion inside is projected from the bottom at predetermined intervals in order, and a downward claw 304 having an undercut portion at the lower side is integrally formed in the upper edge vicinity portion 32d. It is protruding. Also, each of the claws of the inner shell 2
Engagement holes 201, 20 at the portions corresponding to 301, 302, 303, 304
2, 203, 204 are drilled. Then, the upward claws 301 are engaged with the upper edge portions of the corresponding engaging holes 201 so as to be movable in the vertical direction by a required amount, and the both inward claws 302, 303 are opened in the corresponding engaging holes 202, 203. The inward edge portions 202a and 203a and the downward claw 304 are engaged with the opening edge lower portion 204a of the corresponding engaging hole 204 by utilizing elastic deformation of the members. The first inward claw 302 has a straight wall shape extending in the vertical direction, and the opening edge inner portion 202a of the engaging hole 202 corresponding to the first inward claw 302 is formed in a linear shape, and even in the engaged state. The inward claw 302 can slide in the vertical direction with respect to the engagement hole 202. Then, a tongue piece 202c that is deformable in the thickness direction is integrally projected from a portion of the engaging hole 202 that is close to the opening edge, and a free end 202d of the tongue piece 202c is located at the opening edge inner portion 20.
It is brought into contact with the outer surface of the inward claw 302 that engages with 2a.
The second inward claw 303 has a half-moon shape similar to the downward claw 304, but the second inward claw 303 is also in the engagement hole 203 so that the second inward claw 303 can move slightly in the vertical direction in the engaged state. The dimensions of are set. The engaging depth and engaging direction of these claws 301, 302, 303, 304 and the corresponding engaging holes 201, 202, 203, 204 are set so as not to come off under normal use conditions. However, the engagement state can be released by applying a releasing operation from the outside. That is, first, regarding the downward claw 304 and the second inward claw 303, as shown in FIG. 12, a rod D having rigidity such as a screwdriver is attached to the upper edge 22c or the side edge 22a of the inner shell 2 and the outer side. When the shell 3 is inserted between the upper edge 32b or the side edge 32a and elastically deformed by twisting the upper edge or the side edge of the outer shell 3 backward, the corresponding downward claw 304 or 303 is formed. Is lifted and deflected so that it is disengaged from the engaging holes 204 and 203. On the other hand, for the first inward claw 302, as shown in FIG. 15, a rod D having rigidity such as a screwdriver is inserted between the side edge 22a of the inner shell 2 and the side edge 32a of the outer shell 3. Then, the tip is brought into contact with the vicinity of the tip of the tongue piece 202a. In this state, when the rod D is pivoted rearward using the side edge 22a of the outer shell 3 as a fulcrum, the tip of the rod D is moved to the tongue piece 202c.
Is pressed forward, the tongue piece 202c is deformed in the thickness direction, and its free end 202 moves to a position where it cannot contact the inward claw 302. At that moment, the inward claw 302 is deflected so as to raise the jaw according to the deformation of the outer shell 3 and disengages from the engagement hole 202.

As described above, the inner shell 2 and the outer shell 3
The outer shell 3 is detachably attached to the outer shell 3 at the position where the opening 33 is closed, as shown in FIGS.
As shown in the figure, a fixed shell 6 is provided. The fixed shell 6 is detachably attached to the lower surface of the support base 13 of the support unit 1 using bolts.

An exterior material 8 is stretched on the front side of the inner shell 2 with a cushion material 7 interposed therebetween. The peripheral portion of the exterior material 8 is guided to the back surface side of the inner shell 2 and fixed by a tacker or the like (not shown).

 Next, the operation of this chair will be described.

In the reference posture shown by the solid lines in FIGS. 3 and 4,
The backrest 5 is upright, and the seat 4 is held in the most retracted position. This reference posture is suitable for performing work and the like. When the user presses the backrest 5 backward from the reference posture, the balance member 101 rotates backward with the backrest 5 about the axis 102 serving as a fulcrum. As a result, the front end of the balance member 101 moves upward, and the front link member 106 is rotated forward. As a result, the seat receiving frame 105 moves forward, and the rear link member 107 supported by the rear end of the balance member 101 also rotates forward. At this time, the degree to which the entire rear link member 107 descends with the rotation of the balance member 101 is set to be larger than the degree to which the shaft 111 at the upper pivot point thereof rises due to the rotation of the rear link member 107. Therefore, the seat 4 apparently moves forward while gradually retracting the rear end, and reaches the resting position shown by the imaginary line in FIG.

Although it can be operated and used in this way, in this chair, the pins 251, 252 for engaging the seat corresponding portion 21 of the inner shell 2 and the seat corresponding portion 31 of the outer shell 3,
The axes R of 253 and 254 are aligned parallel to each other in the above-described manner, and the tubular portions 351 and 35 of the outer shell 3 are arranged.
Since the axes T of 2, 353 and 354 are respectively matched with the axis R, the assembling work can be performed efficiently. That is, according to such a configuration, the inner shell 2 stably placed face down on the horizontal workbench of the manufacturing line.
It is possible to engage the pins 251, 252, 253, 254 of the inner shell 2 with the tubular portions 351, 352, 353, 354 of the outer shell 3 only by covering the outer shell 3 from right above. . The axis S of the bolt 355 is also the pin 2
Since they are made to correspond to the engaging directions of 51, 252, 253, 254 and the tubular parts 351, 352, 353, 354, they are all parallel.
Therefore, it becomes easy to screw all the bolts into the predetermined position at the same time by the multi-axis screw tightening device that rotates the drivers arranged in parallel at the same time, and the screw fixing work is automatically performed in a short time. It is also possible to make it happen.

Further, the pins 251, 252, 253, 254 and the tubular portions 351, 352,
353 and 354 are side edges of the inner shell 2 corresponding to the seat 21 and the outer shell 3 corresponding to the seat 31.
21b and 31a are engaged with each other along axes R and L forming an angle of about 45 °. Therefore, the pins 251, 252, 25
It is possible to prevent vertical gaps from being formed between the side edges 21b and 31a of the inner shell 2 and the outer shell 3 by the engagement of the cylindrical portions 351, 352, 353, 354 with the 3, 254. . That is, in this embodiment, the bolt 355 screwed to the front pin 251 and the bolt 355 screwed to the rear pin 354.
The seat-corresponding portion 31 of the outer shell 3 is fastened to the inner shell 2 only by the screw, and the intermediate position in the front-rear direction is not screwed. However, at the intermediate position in the front-rear direction, the outer shell 3 is disengaged from the inner shell 2 by the engagement of the pins 252, 253 and the tubular portions 352, 353.
Since it is prevented from separating downward, it is possible to effectively prevent a gap from being formed between the side edges 21b and 31a. Therefore, the seat-corresponding portion 31 of the outer shell 3 can be securely fixed to the seat-corresponding portion 21 of the inner shell 2 with a small number of bolts 355.

Further, when the backrest 5 is tilted rearward as described above, the backrest corresponding portion 32 of the outer shell 3 will be positioned below the backrest corresponding portion 21 of the inner shell 2 and the outer shell 3 of the outer shell 3 will be displaced. Seat corresponding part
31 tries to move forward with respect to the seat corresponding portion 21 of the inner shell 2. In this case, the behavior is
52, 353, 354 and the pins 251, 252, 253, 354 acts to deepen the fitting. Therefore, only the axial force acts on the bolt 355 for fixing the seat-corresponding portion 31 of the outer shell 3 to the seat-corresponding portion 21 of the inner shell 2, and the tilting moment does not work. Therefore, even if the backrest 4 is repeatedly tilted, an undesired tilting force does not act on the screwed portion of the bolt 355, and the problem that the bolt 355 loosens does not easily occur.

It should be noted that the present invention is not limited to the above-described embodiments, and the seat simply swings up and down with respect to the support unit, and the back support rod is pivotally attached to the support base of the support unit. The present invention can also be applied to a chair that has just been opened or a chair that does not have a back support rod.

In addition, the present invention can be applied to a chair other than the chair in which the exterior material is sandwiched between the inner shell and the outer shell. When the present invention is applied to the one in which the outer shell is guided to the back side of the inner shell and fixed to the inner shell, it is possible to use an outer covering material having various thicknesses without changing the dimensions of the outer shell. can get. That is, when an outer shell L-shaped in side view and an outer shell L-shaped in side view are used and an outer covering material is sandwiched between them, a thick outer covering material is used when the conventional fastening structure described above is adopted. Has to make the outer shell larger than when using a thin exterior material,
According to the present invention, since the mounting position of the outer shell with respect to the inner shell can be changed in the direction along the axis (R, T), even if the thickness of the exterior material is slightly different,
Can be dealt with a common outer shell.

EFFECTS OF THE INVENTION Since the present invention has the above-described structure, the inner shell placed on the horizontal workbench or the like in a prone position is covered with the outer shell from just above, and the inner shell The pin and the tubular portion of the outer shell can be engaged with each other. The axis of the bolt is also parallel to the engaging direction of the pin and the cylinder, so that they are all parallel. Therefore, it becomes easy to screw all the bolts at a predetermined position at the same time by a multi-axis type screw tightening device in which drivers arranged in parallel are simultaneously rotated. Therefore, there is an effect that the efficiency of the assembling work can be improved.

In addition, since the vertical gap can be prevented from being formed between the joint edges of the inner shell and the outer shell due to the engagement of the pin and the tubular portion, the fastening position by the bolt can be minimized. it can. Therefore, the number of parts can be reduced to simplify the structure, and the shell can be deformed smoothly as smoothly as possible.

Furthermore, even if the backrest is tilted, only the axial force acts on the bolt, so the bolt for fastening the outer shell to the inner shell will sway or the screw hole will be deformed. It is possible to effectively suppress the occurrence of the problem that the function cannot be exhibited.

[Brief description of drawings]

1 and 2 are drawings for clearly showing the configuration of the present invention, FIG. 1 is a schematic side sectional view showing an inner shell and an outer shell, and FIG. 2 is an operation explanatory view. FIGS. 3 to 15 show an embodiment of the present invention, FIG. 3 is a partially cutaway side view, FIG. 4 is a side sectional view showing the inside, and FIG. 6 and 6 are exploded perspective views, FIG. 7 is a bottom view showing the lower surface side of the inner shell, FIG. 8 is a plan view showing the upper surface side of the outer shell, and FIG. 9 is a seat-corresponding portion of the inner shell and the outer shell. 10 is a side sectional view showing a joint structure with a seat-corresponding portion, FIG. 10 is a partial front view showing a portion near the upper edge of the inner shell, FIG. 11 is a sectional view taken along the line AA in FIG. 10, and FIG. FIG. 13 is a partial front view showing the vicinity of the side edge of the inner shell, and FIG.
FIG. 15 is a sectional view taken along the line BB in FIG. 13, and FIG. 15 is an operation explanatory view corresponding to FIG. 2 …… Inner shell 3 …… Outer shell 4 …… Seat, 4a …… Front edge 5 …… Backrest, 5a …… Upper edge 21 …… Seat-corresponding portion, 22 …… Backrest-corresponding portion 31 …… Seat-corresponding portion , 32 …… Backrest corresponding part 251,252,253,254 …… Pin 251a, 254a …… Screw hole 351,352,353,354 …… Cylinder part 351a, 354a, …… Bolt insertion hole 355 …… Bolt, P …… Virtual plane R, T …… Axis line

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masamitsu Miyashita, 137, Miyata-mura, Kamiina-gun, Nagano Prefecture Takano Co., Ltd. ) Inventor Yoshiyoshi Katagiri 137 Miyata-mura, Kamiina-gun, Nagano Takano Co. Ltd.

Claims (2)

[Claims] 1. An L-shaped inner shell in side view formed by integrally molding a seat corresponding portion and a backrest corresponding portion, and an outer shell L-shaped in side view formed by integrally forming a seat corresponding portion and a backrest corresponding portion. Is a chair integrally configured with a seat and a backrest, wherein the lower surface of the seat-corresponding portion of the inner shell is substantially perpendicular to a virtual plane connecting the front edge of the seat and the upper edge of the backrest. A plurality of pins with their axes aligned parallel to each other, and a cylindrical portion on the upper surface of the seat-corresponding portion of the outer shell, which corresponds to the pins, and whose axes coincide with the axes of the pins. Then, the outer shell is mounted on the inner shell by fitting the pins to the respective cylinders, and the outer shell is fitted with the bolts screwed from a direction parallel or matching the axis. Back chairs, characterized in that it is fixed to the Nasheru. 2. A specific pin is provided with a screw hole along the axial line at the tip end face thereof, and a bolt insertion hole is formed at the outer end of the cylindrical portion fitted to the pin, the bolt insertion hole being open to the lower surface side of the outer shell. The chair with a backrest according to claim 1, wherein the seat-corresponding portion of the outer shell is fixed to the seat-corresponding portion of the inner shell by a bolt screwed into the screw hole of the pin through the bolt insertion hole.