JPH0515230Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is designed to maximize the characteristics of a blow-molded product and to allow it to be stably attached to the side panel of a chair easily and reliably. This invention relates to a hollow plate member for a chair back plate and a chair seat plate made of a blow molded body.

(Problems to be solved by the prior art and the invention) Taking a chair for school children as an example, when forming the back plate and seat plate, conventionally, a piece of wood such as laminated wood is cut out and a curved surface is formed. After forming a core plate, the surface of the core plate is covered with a cushion material, a decorative sheet material, etc., and this is attached to the side plate member of the chair using bolts or dowels.

However, since the core boards that make up the back and seat boards of chairs have uniquely curved surfaces, it is difficult to efficiently manufacture core materials that require a lot of time and effort to carve out. There was also the problem of increased manufacturing costs.

The present inventor noticed that if such a core plate is manufactured by blow molding, it can be manufactured accurately and efficiently. However, since the core plate manufactured by blow molding is a hollow plate and has a thin wall thickness, it is difficult to use bolts or The dowel does not effectively perform its joining function.
Therefore, unlike conventional backboards and seatboards that are solid bodies, such backboards and seatboards cannot be directly attached to the chair side board members using bolts or dowels.

For the above reasons, it is necessary to develop special attachment means for back plates and seat plates using blow-molded bodies.

The object of the present invention is to provide a hollow plate member for a chair back plate and a chair seat plate made of a blow-molded product that can meet such demands.

(Means for Solving the Problems) A hollow plate member 1 for a chair back plate and a chair seat plate (hereinafter referred to as a hollow plate member for a chair) made of a blow-molded body according to the present invention is a hollow plate member 2. A double wall portion 11 is formed at an appropriate location on the side edge portion, and the side end surface 10 of the hollow plate body 2 is the outer surface 11a, and the recess bottom portion 12 and the opposing recess side portions 13, 13 form a fitting recess. A recess 15 is provided which is recessed so as to form a hole 14, and the fitting recess 14 is provided with a hole 16 extending in the inner and outer directions, and a locking portion 3a is formed on the outer surface. The nut member holder 3 is fitted in such a way that its locking portion 3a engages with the recess bottom 12 or the recess side 13 to prevent rotation about its axis. , a through hole 23 provided in the double wall portion 11 so that the hole center coincides with the hole portion 16 of the nut member holder 3;
In the nut member 5, a locking flange 21 is provided around the outer peripheral edge of the base end of a threaded cylinder 20 having an inner threaded part 17 and an outer threaded part 19 formed on the inner peripheral surface and the outer peripheral surface,
The through hole 23 and the hole 16 of the nut member holder 3
This is characterized in that the locking flange 21 of the nut member 5 is brought into contact with the outer surface 11a of the double wall portion 11.

In addition to the hollow plate member 1 for a chair according to the present invention, a double wall portion 11 with the side end surface 10 of the hollow plate body 2 as the outer surface 11a is provided at an appropriate portion of the side edge portion of the hollow plate body 2.
A recess 15 is provided which is depressed so that the double wall portion 11 and the double wall portion 1 are formed.
A concentric through hole 32,
33, and a dowel 29 is inserted into the through holes 32 and 33 so that the joining protrusion 36 protrudes from the outer surface 11a of the double wall portion 11, and is accommodated in the recess 15. Dowel 29 by adhesive 37
This is characterized in that the hollow plate body 6 and the hollow plate body 6 are integrated.

(Function) In the hollow plate member 1 for a chair having such a configuration, the double wall portion 11 having a large thickness, the stable holding action of the nut member holder 3, and the fitting recess 14 are provided.
Nut member rotation prevention effect by the nut member holder 3 fitted in the nut member holder 3 (the locking surface 3 of the nut member holder 3
The nut member 5 is in a state of being integrated with the hollow plate body 2 (see FIGS. 3 and 4) due to the rotation prevention effect caused by the engagement between the nut member 5 and the recess bottom 12 or the recess side 13. Therefore, although the hollow plate member 1, which is appropriately covered with a cushion material, a decorative sheet material, etc., is hollow, the fixing bolt 27 inserted through the bolt hole 26 provided in the side plate member 25 of the chair can be inserted into the nut member. 5, the fixing bolt 27 is smoothly screwed into the nut member 5 without rattling or co-rotation of the nut member 5.

Further, it is supported by the thick double wall portion 11 and the recess wall portion 30 facing the double wall portion 11, and is integrated with the hollow plate body 6 by the adhesive housed in the recess 15. The shaped dowel 29 performs a stable joining function when joining the chair hollow plate member 1 and the chair side plate member 25.

(Example) Hereinafter, an example will be described based on the drawings, taking as an example a case in which the hollow plate member for a chair according to the present invention is applied as a core material forming a chair back plate.

Embodiment according to claim (1) In FIGS. 1 to 3, the hollow plate member 1 for a chair according to the present invention has, for example, The nut members 5 are positioned on both sides and integrally assembled into the hollow plate body 2 via the nut member holders 3. This will be explained in detail below.

As shown in FIGS. 1 and 2, the hollow plate body 2 has a front part 7 forming a backrest surface curved concavely, a rear part 9 curved convexly, and an end face 1 on the opposite side.
0 and 10 are flat surfaces, and in each of the opposing side edge portions of the rear surface portion 9, both side portions of the side edge portion are opposite to the side end surface 10 of the hollow plate body 2. is formed by the recess bottom 12 and the opposing recess side parts (in this embodiment, the lower part of the recess side part) 13, 13 so that a double wall part 11 having an outer surface 11a is formed. The recess 1 is depressed so that a rectangular fitting recess 14 is formed.
5.

As shown in FIGS. 2 to 4, the nut member holder 3 has a hole 16 as a female thread extending in the axial direction.
A locking portion 3a as a flat locking surface is formed on the outer surface to form a columnar shape, for example, a quadrangular columnar shape, and is closely fitted to the fitting recess 14 so that the hole 16 faces inward and outward directions. It's embedded. In this embodiment, the fitted nut member holder 3
is completely integrated with the hollow plate 2 by an adhesive 18 housed in the recess 15, as shown in FIG. Note that the rear end portion 3b of the nut member holder 3 does not necessarily need to be in close contact with the rear portion of the recess. In that case, in order to improve the stability of the nut member holder 3 in the front-rear direction, a locking claw piece is provided on the outer surface of the nut member holder 3 and is inserted into the side of the recess. Alternatively, it is preferable that the nut member holder 3 is formed as a trapezoid whose opposing outer surfaces are slightly inclined upward and outward, and that this is press-fitted into the fitting recess 14. Note that when the nut member holder 3 is made of synthetic resin, the hole 16 may be formed as a simple hole (including a blind hole). In this case, by screwing the nut member 5 into the hole 16, a thread groove is formed on the inner peripheral surface of the hole. Also, nut member holder 3
As long as there is no problem in stably holding the nut member 5,
It may also be formed into a plate shape with holes.

As shown in FIGS. 2 and 3, the joining nut member 5 is a threaded cylinder with an inner threaded part 17 and an outer threaded part 19 formed on the inner and outer peripheral surfaces, and whose outer peripheral surface has a slightly tapered tip. A locking collar 21 is provided around the outer peripheral edge of the proximal end of the externally threaded portion 19, and a square hole 2 is provided at the proximal end of the externally threaded portion 19 into which the distal end portion of the wrench is fitted.
2 is provided. The nut member 5 having such a configuration has a through hole 23 provided in the double wall portion 11 such that the hole center coincides with the female screw portion 16 of the nut member holder 3 fitted into the fitting recess 14. , is screwed into the through hole 23 and the female threaded portion 16 of the nut member holder 3, so that the locking collar 21 of the nut member 5 is in contact with the outer surface 11a of the double wall portion 11.

Hollow plate member 1 for a chair having such a configuration
The surface portion of the back plate A is covered with a cushion material or a decorative sheet material, and the procedure for attaching it to the chair side plate member 25 is as shown in FIGS. 3 and 5. Side plate members of opposing chairs (one side plate member is omitted in Figure 4)
This is done by screwing fixing bolts 27, which are inserted through respective bolt holes 26 provided in the hollow plate body 2, into the internal threads 17 of the nut member 5, which is integrated with the hollow plate body 2.

Embodiment according to claim (2) In FIGS. 6 to 8, the hollow plate member 1 for a chair according to the present invention has a hollow plate member 2 in which each of the opposing side edge portions on one surface of the hollow plate body 2 has a For example, the dowels 29 are placed on both sides and are integrally incorporated into the hollow plate body 2. This will be explained in detail below.

As shown in FIGS. 6 and 7, the hollow plate body 2 has a front surface 7 forming a backrest surface curved concavely, a rear surface 9 curved convexly, and an opposite end surface 1.
It is formed as a rectangular curved plate with flat surfaces 0 and 10, and in each of the opposing side edge portions of the rear surface portion 9, both side portions of the side edge portions touch the side end surface 10 of the hollow plate body 2. A recess 15 is formed by recessing so that a double wall portion 11 serving as an outer surface 11a is formed, and the double wall portion 11 and the double wall portion 1 are
A concentric through hole 32,
33 are provided.

Further, the dowel 29, as shown in FIGS. 7 and 8,
It is formed in the shape of a wooden round bar, and a groove for holding an adhesive is provided on the circumferential surface thereof so as to flow in the axial direction. The dowel 29 is inserted through the through holes 32 and 33 so that the bonding protrusion 36 protrudes from the outer surface of the double wall 11, and the adhesive 37 is inserted into the recess 15. It is integrated with the hollow plate body 2 by.

The hollow board member 1 for a chair having such a configuration
The surface of the back panel A is covered with a cushioning material or a decorative sheet material, for example, and the dowel 2 is
The connecting projections 36 of the chair 9 are press-fitted into insertion holes 39 provided in the side plate members 25 of the chair and are attached to the side plate members 25 of the chair by being adhered thereto.

Others When the present invention is applied as a core plate forming a chair seat plate, its structure is the same as that of the back plate, and the procedure for attaching it to the chair side plate member 25 is also the same (No. (See Figure 9).

The hollow plate member 1 for a chair according to the present invention may be used as a chair back plate or a chair seat plate by coloring the surface portion thereof. Also recessed place 15
may be provided on both sides of the hollow plate body 2.

(Effects of the invention) Since the hollow plate member according to the invention is configured as described above, it exhibits its characteristics as a blow-molded product to the maximum extent possible. In addition, by effectively utilizing the thick double wall portion and the recess forming it, it is possible to easily and reliably attach the chair to the side plate member. This will be explained in detail below.

In the hollow plate member for a chair according to claim (1), the nut member is supported by the double wall portion made thick by forming the recess, and the nut member holder is fitted into the recess. Because it is screwed into the hole,
The nut member is stably held in the nut member holder of the thick double wall portion and the screw guide groove.

Further, the nut member holder that holds the nut member has a locking portion on its outer surface, and the locking portion engages with the bottom of the recess or the side of the recess to prevent rotation around its axis. Since the nut member is fitted into the fitting recess of the recess so as to be in a closed state, rotation of the nut member is reliably prevented.

By stably holding the nut member and preventing rotation of the nut member as described above, in the hollow plate member for a chair according to the present invention, the nut member is in a state of being integrated with the hollow plate body. Therefore, although the hollow plate member is appropriately covered with cushion material, decorative sheet material, etc., even though it is hollow, the fixing bolt inserted through the bolt hole provided in the chair side plate member can be inserted into the internal threaded part of the nut member. When screwed in, the fixing bolt is screwed into the nut member smoothly without rattling or co-rotation of the nut member. The hollow plate member can be stably attached to the chair side plate member in a state similar to that of the chair side plate member. Moreover, it can be easily attached using fixing bolts, as in the conventional case.

In the hollow plate member for a chair according to claim (2), the dowel is formed by a double wall portion made thick by forming a recess and a recess wall portion opposing the double wall portion. Since it is stably supported and fixed in the recess with an adhesive, in the hollow plate member for a chair according to the present invention, the dowel is in a state of being integrated with the hollow plate body. Therefore, although the hollow plate member is appropriately covered with a cushion material, a decorative sheet material, etc., it can be stably and easily attached to the chair side plate member via the joining protrusion, even though it is hollow.

Since the hollow plate member for a chair according to the present invention is a blow-molded product, the unique three-dimensional curved form that it should have when used as a chair back plate or chair seat plate can be easily and precisely formed. Can be molded. Further, since the hollow plate member for a chair according to the present invention is a hollow body, it has excellent heat insulation properties and can be constructed to be lightweight.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a perspective view illustrating how to assemble the nut member and the nut member holder into the recess, and Figure 3 is a partial sectional view showing the state in which the back plate formed by applying the present invention is attached to the chair side plate member. , FIG. 4 is an explanatory diagram for explaining the function of the nut member holder, FIG. 5 is a perspective view showing the chair back plate and chair seat plate formed by applying the present invention together with the chair side plate members, and FIG. FIG. 7 is a perspective view showing another embodiment of the present invention, FIG. 7 is a perspective view showing a dowel together with a recess, and FIG. 8 is a back plate formed by applying the hollow plate member for a chair shown in FIG. 6. FIG. 9 is a partial sectional view showing a state where it is attached to a chair side plate member, and FIG. 9 is a perspective view showing a chair back plate and a chair seat plate formed by applying the chair hollow plate member shown in FIG. 6 together with the chair side plate member. be. 1...Hollow plate member for chair, 2...Hollow plate body, 3
... Nut member holder, 5 ... Nut member, 11
...Double wall part, 13... Fitting recess, 16... Hole, 17... Internal threaded part, 19... External threaded part, 20
...Threaded cylinder, 21 ... Locking collar, 23 ... Through hole, 2
9... Dowel, 31... Recess wall, 32, 33...
Through hole, 36... joint protrusion, 37... adhesive.

Claims (1)

[Claims for Utility Model Registration] (1) A double wall portion 11 with the side end surface 10 of the hollow plate body 2 as the outer surface 11a is formed at an appropriate position on the side edge portion of the hollow plate body 2, and the recess bottom 12 and a fitting recess 14 by opposing recess sides 13, 13.
A recess 15 is provided which is recessed so as to form a recess 15, and the fitting recess 14 is provided with a hole 16 extending in the inner and outer directions, and a locking portion 3a is formed on the outer surface. The nut member holder 3 is fitted in such a manner that its locking portion 3a engages with the recess bottom 12 or the recess side 13 to prevent rotation about its axis, In the through hole 23 provided in the double wall portion 11 so that the hole center coincides with the hole portion 16 of the nut member holder 3, an internal thread portion 1 is provided on the inner peripheral surface and the outer peripheral surface.
7 and an external threaded portion 19 are formed.
A nut member 5 having a locking flange 21 around the outer peripheral edge of the base end of the nut member 5 is screwed into the through hole 23 and the hole 16 of the nut member holder 3, and the locking flange 21 of the nut member 5 is screwed into the double wall. A hollow plate member for a chair back plate and a chair seat plate, which is made of a blow molded body and is in contact with an outer surface 11a of a portion 11. (2) A recess 15 is provided at an appropriate position on the side edge of the hollow plate 2 so as to form a double wall 11 with the side end surface 10 of the hollow plate 2 serving as the outer surface 11a. The double wall portion 11 and the recess wall portion 31 facing the double wall portion 11 are provided with concentric through holes 32 and 33.
33 has a dowel 2 so that the joining protrusion 36 protrudes from the outer surface 11a of the double wall portion 11.
9 is inserted through the hollow plate body 6, and the dowel 29 and the hollow plate body 6 are integrated by an adhesive 37 housed in the recess 15. Hollow plate member for chair seat.