JPH0263415A - Chair - Google Patents

Abstract

PURPOSE:To prevent the generation of sagging on an external trim member by integrally providing projections at least on the top face side of a seat portion of an inner shell at the time of stretching the external trim member on the top face side of the inner shell via a cushion member. CONSTITUTION:Projections 200 provided on an inner shell 2 are bitingly engaged with the bottom face of the front edge portion 7b of a cushion member 7, preventing the cushion member 7 from being slid along the top face 2a of the inner shell 2. If the projections 200 are projected obliquely front upward, when a rearward energizing force is applied to the front edge portion of the cushion member 7, the projections 200 are liable to bite into the downside of the cushion member 7 to further ensure the engagement between the cushion member 7 and the projections 200. Also, if a tapped hole 251a for fastening the outer shell 3 to the inner shell 2 is provided so as to make a screw reach the inside of the projection 200, the projections 200 also serve as reinforcing thick-wall portions.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a chair in which an exterior material is stretched over the upper surface of an inner shell via a cushioning material.

[Prior Art] Conventionally, this type of chair has been developed, for example, which has an inner shell made of synthetic resin and has an exterior material such as cloth stretched over the upper surface of the inner shell through a cushioning material. There is.

However, what was conventionally considered was to attach the cushioning material directly to the inner shell, apply an exterior material to the surface of the cushion, and place the peripheral edge of the exterior material on the back side of the inner shell. The inner shell is guided and fixed to the inner shell using a tacker or the like.

[Problems to be Solved by the Invention] However, with just this, there is a problem in that the cushioning material tends to shift at the front edge of the seat. That is, the front edge of the seat generally has a smooth curved surface due to its function. In addition, since the upper surface of the seat needs to have a slightly bulging shape at both edges and the center, the exterior material that is placed over the seat must be relatively strong in the front and rear direction than in the left and right direction. It is necessary to apply tension. Therefore, the front edge of the cushioning material is always urged backward, and if used for a long period of time, there is a risk that the front edge of the cushioning material will slip and shift backward. If the front edge of the cushioning material shifts inward, it not only makes sitting uncomfortable, but also causes problems such as sagging in the exterior material.

The present invention aims to solve these problems with a simple configuration.

[Means to solve the problem] The present invention has been made to achieve the above objects.

The following configuration is adopted.

That is, as shown in FIGS. 1 and 2, the chair according to the present invention has an exterior material (8) stretched on the upper surface (2a) side of the inner shell (2) via a cushion material (7). At least the front edge (21f) of the upper surface of the seat-corresponding portion (21) of the inner shell (2)
It is characterized in that a protrusion (200) is integrally provided on the protrusion.

In order to particularly effectively prevent surface slippage of the cushioning material (7), it is preferable to provide the protrusion (200) so as to protrude diagonally forward and upward.

In addition, in order to utilize the protrusion (200) more effectively, a screw hole (251a) extending into the protrusion (200) is opened in the lower surface (2b) of the inner shell (2). Bolt (355) screwed into 251a)
The outer shell (3) is attached to the inner shell (2) by
It may be fixed to the lower surface (2b) of. In this case, screw holes (251a) are provided for all protrusions (200').
may be provided, but only some of the protrusions (200) may be used.

[Function] According to such a configuration, the protrusion (200) protruding from the inner shell (2) touches the front edge (7) of the cushioning material (7).
7b) Since the cushioning material (7) is engaged with the lower surface of the inner shell (2) by biting into the upper surface (
It is possible to prevent surface slippage along 2a). In this case, if the protrusion (200) is provided to protrude diagonally forward and upward, when a rearward biasing force acts on the front edge of the cushioning material (7), the protrusion will appear on the lower surface of the cushioning material (7). (200) has a tendency to bite, so that the engagement between the cushion material (7) and the protrusion (200) becomes more reliable.

Further, a screw hole (251a) for fixing the outer shell (3) to the inner shell (2) is provided in the projection (20).
0), this protrusion (200) also plays a role as a reinforcement part. Therefore, the front edge (21f) of the inner shell (2) can be made slim without impairing the strength of attachment of the outer shell (3).

[Example 1] An example of the present invention will be described below with reference to FIGS. 3 to 8.

As shown in FIG. 3, the chair of this embodiment includes a seat 4 and a backrest 5, which are integrally constructed using an inner shell 2 and an outer shell 3, on a support unit 1.

As shown in FIG. 3, the support unit 1 includes a base 11 having leg blades projecting radially, a pedestal 12 erected at the center of the base 11, and a pedestal 12 connected to the upper end of the pedestal 12. The support base 13 is provided with a support base 13. A balance member 101 is pivoted on both sides of this support base 13, respectively.

As shown in FIGS. 4 and 5, the balance member 101 is an elongated plate-like member extending back and forth, and its middle portion is rotatably attached to the support base 13 via a shaft 102. . The rear ends of the left and right balance members 101 are connected to a connecting fitting 10.
3, and from the connecting part to the back support rod 10
4 extends rearward and upward. Furthermore, a floor support frame 105 is disposed on the support base 13. The front end of the floor support frame 105 is connected to the front end of the support base 13 via the front link member 106, and the rear end is connected to the rear end of the rain balance member 101 via the rear link member 107. are doing. In other words, floor support frame 1
The upper pivot ends of the left and right front link members 106 are pivotally attached to the front ends of the left and right front link members 106 via a shaft 108, and the lower pivot ends of both front link members 106 are attached to the support base 13, and the shaft 1
It is pivotally connected via 09. In addition, the upper pivot ends of the left and right rear link members 107 are attached to the rear ends of the seat frame 105 on the shaft 111.
These post-rain link members 1
07 to the rear end of the balance member 101 to the shaft 11.
It is pivotally connected via 2. And both the balance members 10
A long hole 113 extending back and forth is provided at the front end of 1,
The elongated hole 113 is slidably connected to a shaft 110 provided at the rear pivot point of the front link member 106. In addition,
An intermediate shaft 114 is installed in the middle part of the side wall of the support base 13, and a main spring 115 is stretched between the intermediate shaft 114 and the shaft 108 to elastically bias the seat support frame 105 rearward. There is. Further, an auxiliary spring 116 is wound around the shaft 109 so that the auxiliary spring 116 can bias the seat support frame 105 in the same direction. One end of the auxiliary spring 116 is locked by a spring force adjustment mechanism 117, and by changing the locking position, the biasing force exerted by the auxiliary spring 116 can be adjusted.

The front end of the seat support frame 105 and the back support rod 10
As shown in FIGS. 4 and 5, horizontally long brackets 118 and 119 are respectively fixed to the upper ends of the shells 4 and the inner shell 2 is attached to each of the horizontally long brackets 118 and 119.

As shown in FIGS. 4 to 8, the inner shell 2 is formed by integrally molding a seat corresponding portion 21 and a backrest corresponding portion 22, and is shaped like an elastically deformable material such as polypropylene. Made of synthetic resin. The seat-corresponding portion 21 has a shape in which both left and right side edges 21b and a central portion are slightly raised, and a nut 23 is fixedly installed in the front portion of the side edge vicinity portions 21s. Then, the nut 23 is inserted through the vicinity of both ends of the horizontally long bracket 118.
This inner shell 2 is attached to the seat support frame 105 by a bolt (not shown) screwed into the seat support frame 105.

In addition, in this embodiment, a nut 25 is also fixedly installed in the center front part of the inner shell 2, and the seat support frame 105
The mounting strength of the inner shell 2 is increased by an auxiliary bolt (not shown) that penetrates the front end of the inner shell 2 and is screwed onto the nut 25. The backrest corresponding portion 22 has left and right side edges 22a.
The nut 26 is slightly curved in the forward direction, and a nut 26 is fixed at the vicinity of both side edges 22d at the so-called backrest point and the height position between the seats. Bolts 27 are passed through the vicinity of both ends of the horizontally long bracket 119.
This inner shell 2 is connected to the back support rod 104 by screwing into the nut 26. In addition, the seat corresponding part 21 and the backrest corresponding part 2 of this inner shell 2
2, the degree of curvature in the direction in which the left and right edges 28a move forward is set to approximately zero, and is curved so as to form a semicircular arc shape in side view and bulge rearward. and,
Two parallel slits 29 extending vertically are provided in this boundary portion 28. The lower end 29 of both these slits 29
The a side extends to the rear of the seat corresponding part 21, and the upper end 29b side extends to a position higher than the backrest point of the backrest corresponding part 22, and both of these slits 2
The portion 22b located between the 9 and 9 protrudes forward.

Front edge 21f of seat corresponding portion 21 of this inner shell 2
has a shape that descends smoothly toward the front, and has a plurality of protrusions 200 integrally protruding from the upper surface of its front end 21f. The protrusion 200 is, for example, as shown in FIGS. 6 and 7.
As shown in the figure, it has a spindle shape and protrudes diagonally forward and upward at an angle of about 45° with respect to the seat surface.

An exterior material 8 is stretched over the upper surface 2a of the inner shell 2 with a cushion material 7 interposed therebetween.

The cushion material 7 is, for example, a molded product made of urethane resin or the like, and the exterior material 8 is made by pasting a urethane sheet or the like on the inner surface of cloth. The cushion lug 7 is attached directly to the inner shell 2, and at the front edge 21f of the seat corresponding portion 21, as shown in FIG. Then, let it engage.

As shown in FIGS. 7 and 8, the peripheral edge 8a of the exterior material 8 is guided toward the lower surface 2b and rear surface 2c of the inner shell 2, and when a predetermined tension is applied to the entire exterior material 8. , and is fixed to the inner shell 2 using a large number of tackers 81.

On the other hand, as shown in FIGS. 4 to 8, the outer shell 3 is formed by integrally molding a seat corresponding portion 31 and a backrest corresponding portion 32, and is shaped like a rectangular shape when viewed from the side, and is made of elastically deformable material such as polypropylene. Made from possible synthetic resin. The seat-corresponding portion 31 has a spherical shape that bulges downward, and is provided with a rectangular opening 33 that is long in the front and back at the center thereof.

The backrest corresponding portion 32 has a shape in which left and right edges 32a are curved in a forward direction, and the degree of curvature increases as the upper edge 32b approaches the backrest point.

The degree of curvature of the outer shell 3 near the backrest point is greater than the degree of curvature of the inner shell 2 at the same cross-sectional position. In addition, this outer shell 3
The boundary portion 34 between the seat corresponding portion 31 and the backrest corresponding portion 32 has a degree of curvature of approximately zero in the direction in which the left and right side edges 34a move forward, and bulges rearward in a semicircular arc shape when viewed from the side. It is curved to look like this. A portion near the base end of the backrest corresponding portion 32 in this outer shell 3,
That is, the upper portion of the boundary portion 34 is brought close to a portion of the inner shell 2 near the base end of the backrest corresponding portion 22, that is, the second portion of the boundary portion 28.

The attachment structure of the outer shell 3 to the inner shell 2 is as follows. First, the front edge 31f and the side edge vicinity 31s of the seat corresponding portion 31 of the outer shell 3 are screwed to the front edge 21f and the side edge vicinity 21s of the seat corresponding portion 21 of the inner shell 2. That is, as shown in FIGS. 6 and 7, a plurality of pins 251. 25
2.253.254 are provided protrudingly with their axes parallel to each other, and the upper surface 3a of the outer shell 3, specifically, the upper surface of the front edge 31f of the seat corresponding portion 31 and the side edge vicinity portion 31. As shown in FIGS. 6 and 7, cylindrical portions 351, 352, 353, and 354 are protrudingly provided on the upper surface of the , each of those cylindrical parts 351.35
2.353.354 and each of the above pins 251.252.25
3.254 is fitted to attach the outer shell 3 to the inner shell 2. The seat-corresponding portion 31 of the outer shell 3 is fixed to the seat-corresponding portion 21 of the inner shell 2 by a bolt 355 threaded in a direction that coincides with the axis. Specifically, the specific pin 2
51.254 has a screw hole 251a along the axis on the tip surface,
254a, and a bolt insertion hole 351a that opens toward the lower surface 3b of the outer shell 3 at the outer end of the cylindrical portion 351.354 that fits into the pin 251.254;
354a, and the bolt insertion holes 35Ia, 35
4a through the screw hole 251a of the pin 25L 254
, 254a fixes the seat-corresponding portion 31 of the outer shell 3 to the seat-corresponding portion 21 of the inner shell 2. In this embodiment, the protrusion direction of each of the protrusions 200 is made to coincide with the axis R of each of the pins 251, and the inner end of the screw hole 251a extends into the protrusion 200.

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 using claws. Specifically, as shown in FIG. 6, the outer shell 3 has an upward mold 301 bent in a cross-shaped shape when viewed from the side near the side edge 32c, and a first inward mold having an undercut portion in the inner pusher 1. A second inward mold 303 that is the same as the mold 302 (having an undercut portion on the inside) is provided protruding from the bottom at a predetermined interval, and a lower mold 303 having an undercut portion on the lower side is provided in the vicinity of the upper edge 32d. A headwind 304 is integrally provided. Also, the winter melon 301.30 of the inner shell 2
Engagement holes 201.2.303 and 304.
202.203.204 are installed. Then, the upward mold 301 is engaged with the upper edge of the corresponding engagement hole 201 so as to be movable in the vertical direction by a required amount, and both the inward claws 302 and 303 are connected to the opening of the corresponding engagement hole 202 and 203. The opening of the engagement hole 204 corresponding to the lower surface mold 304 is attached to the edge white band portions 202a and 203a.
a by utilizing the elastic deformation of each member. Note that the first inward type 302 has a straight wall shape that extends downward by -1, and the opening edge white band portion 202a of the corresponding engagement hole 202 is formed in a straight line, and the engagement hole 202 has a straight wall shape extending downward. Even in this state, the inward mold 302 is configured to be able to slide downward by 1" with respect to the engagement hole 202. A tongue piece 202c that can be deformed in the thickness direction is integrally provided from a portion near the four opening edges of the engagement hole 202, and the free end of the tongue piece 202c engages with the opening edge white band portion 202a. Type 3
It is made to come into contact with the outer surface of 02. The second inward mold 303 has a half-moon shape similar to the lower mold 304, but the engagement hole 203 is shaped so that the second inward mold 303 can also move slightly up and down in the engaged state. The dimensions are set. These nails 301.302.303.30
4 and each corresponding engagement hole 201.202.203.204
The depth of engagement and the direction of engagement are set so that they will not come off during normal use.

In the above manner, the inner shell 2 and the outer shell 3 are
is attached, but the opening 33 of this outer shell 3
As shown in FIGS. 3, 4, and 6, a fixed shell 6 is disposed at a position to close the opening. Thus, this fixed shell 6 is removably attached to the lower surface of the support base 13 of the support unit 1 using bolts.

Next, the operation of this chair will be explained.

In the reference posture shown by solid lines in FIGS. 3 and 4, the backrest 5 is erected and the seat 4 is held at the most retracted position. This standard posture is suitable for working, etc. When the user presses the front rest 5 backward with his or her back from this reference posture, along with this back rest 5,
The balance member 101 rotates rearward about a shaft 102 that serves as a fulcrum. As a result, the front end of the balance member 101 moves by -1, and the front link member 106 is rotated forward. As a result, the floor support frame 105 moves forward, and the balance member 10
The rear link member 107 supported at the rear end of the vehicle 1 also rotates forward. At this time, the degree to which the entire rear link member 107 descends as the balance portion 101 rotates is set to be greater than the degree that the axis 111 of the second type landing point rises due to the rotation of the rear link member 107. Therefore, the seat 4 apparently moves forward while gradually sinking its rear end, and reaches the resting position shown by the imaginary line in FIG. 4.

Although it can be operated and used in this way, in this chair, the front end 2 of the seat corresponding portion 21 of the inner shell 2
A plurality of protrusions 200 are provided protruding from 1f, and these protrusions 2
00 is engaged with the lower surface 7a of the cushioning material 7, it is possible to effectively prevent the front edge portion 7b of the cushioning material 7 from shifting backward. In particular, in this embodiment, since the protrusion 200 projects obliquely forward and upward, when a rearward biasing force acts on the front edge of the cushioning material 7, the protrusion 200 appears on the lower surface 7a of the cushioning material 7. The cushion material 7 and the protrusion 200
This makes the engagement more reliable. Therefore, protrusion 2
00 makes it possible to effectively prevent displacement of the cushion material 7.

Further, in this embodiment, the screw hole 251a for fixing the outer shell 3 to the inner shell 2 is provided in the projection 2.
Since the protrusion 200 is provided so as to extend into the inside of the protrusion 200, this protrusion 200 also plays a role as a reinforcement part. Therefore, the front edge 21f of the inner shell 2 can be made slim without impairing the strength of securing the outer shell 3. That is, if there is no such protrusion 200, or even if there is such a protrusion 200, the protrusion 200 is inserted into the screw hole 2.
If not provided in conjunction with bolt 35
In order to secure the required length of the fastening shape 5, it is necessary to make the front edge 21f of the inner shell 3 thick.
As described above, by using the protrusion 200, there is no need to increase the thickness, and the front edge 4a of the seat 4 can be made to have an excellent appearance.

Note that the present invention can also be applied to a chair in which the seat and backrest are separate bodies.

[Effects of the Invention] Since the present invention has the above-described configuration, it is possible to effectively solve the problem of the cushioning material misaligning along the upper surface of the inner shell without increasing the number of parts at all. The effect is that the usability and appearance of the seat can be maintained in good condition for a long period of time.

In addition, if the screw holes for fixing the outer shell to the inner shell are provided inside the protrusions to prevent the cushion material from shifting, the strength of the fixation will not be reduced. The front edge of the inner shell can be made slim, and the appearance of the chair can be particularly good.

[Brief explanation of the drawing]

1 and 2 are drawings for clearly showing the structure of the present invention, with FIG. 1 being a side sectional view and FIG. 2 being a perspective view showing the inner shell. Figures 3 to 8 show an embodiment of the present invention, with Figure 3 being a partially cutaway side view, Figure 4 being a side sectional view showing the inside, and Figure 5 being a partially cutaway plan cross section. Figure, 6th
The figure is an exploded perspective view, Figure 7 is a side sectional view showing the joint structure between the seat-corresponding part of the inner shell and the seat-corresponding part of the outer shell, and Figure 8 is the joint between the side edge of the inner shell and the side edge of the outer shell. It is a front sectional view showing a part. 2... Inner shell 2a... Top surface 2b...
Lower surface 3... Outer shell 4... Seat

Claims (1)

[Scope of Claims] 1. A chair comprising an exterior material stretched over the upper surface of an inner shell via a cushioning material, wherein a protrusion is integrally formed on at least the front edge of the upper surface of the seat-corresponding portion of the inner shell. A chair characterized by a protruding part. 2. The chair according to claim 1, characterized in that the protrusion projects diagonally forward and upward. 3. In the chair according to claim 1, a screw hole extending into the projection is opened in the lower surface of the inner shell, and the outer shell is fixed to the lower surface of the inner shell by a bolt screwed into the screw hole. A chair characterized by: