JPH0515228Y2 - - 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, there is a problem in that 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 Problem) A hollow plate member for a chair back plate and a chair seat plate (hereinafter referred to as a hollow plate member for a chair) 1 made of a blow-molded body according to the present invention is a side edge of a hollow plate body 2. At the appropriate part of the part, the side end surface 9 of the hollow plate body 2 is connected to the outer surface 10a.
A recess 11 is provided which is depressed so that a double wall 10 is formed.
The through hole 12, which is provided so as to pass through the hole 0, has an internal threaded part 13 and an external threaded part 15 on the inner and outer peripheral surfaces.
The nut member 3 has a locking flange 17 around the outer circumferential edge of the base end of a threaded cylinder 16 formed with a screw tube 16.
7 is in contact with the outer surface 10a of the double wall portion 10, and the threaded cylinder 16 is screwed so as to protrude into the recess 11. Also, the outer peripheral surface 2 of the nut member 3
3, a ring-shaped locking member 5 made of a spring material and having a notched groove 20 for mounting is provided, and a locking protrusion 21 provided on the inner peripheral edge thereof engages with a thread groove 22 of an external threaded portion 15. The ring-shaped locking member 5 is installed by expanding the notch groove 20 so that the outer circumferential surface 23 is elastically tightened, and in this installed state, the ring-shaped locking member 5 is attached to the inner surface of the recess 11. It is designed to be engaged with and prevented from rotating.

(Function) In the chair hollow plate member 1 having such a configuration, the nut member 3 is stably held by the thick double wall portion 10, and the ring-shaped locking member 5 is elastically tightened. The nut member 3 is in a state of being integrated with the hollow plate body 2 due to the rotation prevention effect of the nut member 3 due to the frictional force. Therefore, although the hollow board member 1 for a chair is appropriately covered with a cushion material, a decorative sheet material, etc., although it is hollow, the fixing bolt 30 is inserted through the bolt hole 29 provided in the side board member 27 of the chair. When screwed into the internal threaded portion 13 of the nut member 3, the fixing bolt 30 is smoothly screwed into the nut member 3 without rattling or co-rotation of the nut member 3.

(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 plate forming a chair back plate.

In FIGS. 1 to 4, the hollow plate member 1 for a chair according to the present invention is located at each of the opposing side edge portions on one surface of the hollow plate body 2, for example, on both sides of the side edge portion, and A nut member 3 is integrally assembled into a hollow plate body 2 via a ring-shaped locking member 5. This will be explained in detail below.

As shown in FIGS. 1 to 3, the hollow plate body 2 has a front surface 6 forming a backrest surface curved concavely, a rear surface 7 curved convexly, and opposite end surfaces 9, 9 are flat surfaces. It is formed as a rectangular curved plate body, and in each of the opposing side edge portions of the rear surface portion 7, both side portions of the side edge portion are two sides with the side end surface 9 of the hollow plate body 2 serving as an outer surface 10a. The double wall portions 10 are depressed to form recesses 11, and through holes 12 are provided so as to pass through each of the double wall portions 10.

As shown in FIGS. 2 and 3, the joining nut member 3 is a threaded cylinder with an inner threaded portion 13 and an outer threaded portion 15 formed on the inner and outer peripheral surfaces, and whose outer peripheral surface has a slightly tapered tip. A locking collar 17 is provided around the outer peripheral edge of the base end of the threaded cylinder 16, and a square hole 1 is provided at the base end of the threaded cylinder 16 into which the tip of the wrench is fitted.
9 is provided. The nut member 3 having such a configuration is arranged such that the locking collar 17 is in contact with the outer surface 10a of the double wall portion 10 in the through hole 12, and the threaded cylinder 16 protrudes into the recess 11. It's screwed in.

As shown in FIG. 2, the ring-shaped locking member 5 is entirely made of a spring material, has a ring shape with a notch groove 20 for mounting, and has a ring-shaped locking member 5, for example, at both ends of its inner peripheral edge. A locking protrusion 21 is provided at the portion and the center portion. The ring-shaped locking member 5 having such a configuration has the third to fifth rings.
As shown in the figure, the locking protrusion 2 is attached to the threaded cylinder 16 of the nut member 3 screwed into the through hole 12.
1 engages with the thread groove 22 of the external threaded portion 15 and is mounted by expanding the notch groove 20 so that the outer circumferential surface 23 of the threaded cylinder is elastically tightened. In the attached state, the ring-shaped locking member 5 has both side portions 25 and 2, for example, as shown in FIG.
5 engages with inner side portions 26, 26 of the recess 11 to prevent rotation.

Hollow plate member 1 for a chair having such a configuration
The surface portion of the is covered with a cushion material or a decorative sheet material to form, for example, the back plate A, but the procedure for attaching it to the chair side plate member 27 is as described in Section 6.
As shown in FIGS. 3 and 3, the fixing bolts 30 inserted through the respective bolt holes 29 provided in the side plate members of the opposing chairs (one side plate member is omitted in FIG. 6) are inserted into the hollow plate. This is done by screwing into the internal thread 13 of the nut member 3 which is integrated with the body 2.

Even when the present invention is applied as a core plate forming the chair seat plate B, its structure is the same as that of the core plate forming the back plate, and the installation procedure to the chair side plate member 27 is the same. The same applies (see Figure 6).

Note that the hollow board member 1 for a chair according to the present invention may be used as a chair back board or a chair seat board by coloring the surface portion thereof. Mata recess 1
3 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.

Since the nut member is screwed into the thick double wall portion by forming the recess, the screwed nut member is stably held in the thick double wall portion. Incidentally, if a nut member is screwed into a single wall portion of a blow-molded hollow plate, it is inevitable that the nut member will become unstable.

In addition, a ring-shaped locking member that is prevented from rotating in a recess is attached to the threaded cylinder of the nut member screwed into the double wall part, and a locking protrusion provided on the inner peripheral edge of the ring-shaped locking member is attached to the outer peripheral surface of the screw cylinder. Since the nut member is attached so as to be elastically tightened, rotation of the nut member is prevented by the frictional force accompanying the elastic tightening of the ring-shaped locking member.

By stably holding the nut member by the double wall portion and preventing rotation of the nut member by the ring-shaped locking member, in the hollow plate member for a chair according to the present invention, the nut member is integrated with the hollow plate body. It is in a state of transformation. 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.

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 accurately 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 drawings]

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 locking member into the recess, and FIG. 3 is a partial cross-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 a perspective view showing the state in which the locking member is attached to the nut member, Fig. 5 is an explanatory view explaining the action of the locking member, and Fig. 6 is a chair back plate formed by applying the present invention. FIG. 3 is a perspective view showing a chair seat plate together with a chair side plate member. 1...Hollow plate member for chair, 2...Hollow plate body, 3
... Nut member, 5 ... Ring-shaped locking member, 10
...double wall part, 11 ... recess, 12 ... through hole, 1
3... Internal threaded part, 15... External threaded part, 16... Threaded tube, 17... Locking collar, 20... Notch groove, 21...
...locking protrusion, 22...thread groove.

Claims (1)

[Scope of utility model registration request] A double wall portion 1 having the side end surface 9 of the hollow plate body 2 as the outer surface 10a is installed at an appropriate position on the side edge portion of the hollow plate body 2.
A recess 11 is provided which is recessed so as to form a hole 10, and a through hole 12 provided so as to pass through the double wall portion 10 has an internal threaded portion 13 on its inner and outer circumferential surfaces. The nut member 3 has a locking flange 17 around the outer peripheral edge of the base end of a threaded cylinder 16 in which an external threaded portion 15 is formed.
is in contact with the outer surface 10a of the threaded cylinder 1.
6 is screwed into the nut member 3 so as to protrude into the recess 11, and on the outer peripheral surface 23 of the nut member 3, there is a ring-shaped locking member 5 made of a spring material and provided with a notched groove 20 for mounting. It is installed by expanding the notch groove 20 so that the locking protrusion 21 provided on the inner circumferential edge engages with the thread groove 22 of the outer threaded part 15 and elastically tightens the outer circumferential surface 23. , and in the mounted state, the ring-shaped locking member 5 engages with the inner surface of the recess 11 and is prevented from rotating. Hollow plate parts for boards and chair seats.