JPS637066Y2 - - Google Patents

Description

[Detailed description of the invention] A strip piece with engaging protrusions protruding from several places on the inner surface is constructed, and this strip piece is buried in the back of the table plate with the engaging protrusions protruding inside the back part, and this strip piece is also embedded in the back of the table plate with the engaging protrusions protruding inside the back. Separately, the case body has engagement receiving holes provided at several locations on the outer surface of the rear wall, and the outer surface of the rear wall of this case body is brought into contact with the inner surface of the above-mentioned back part to lock the engaging protrusions in the engagement receiving holes. In addition, a case in which the front plate is attached to the case body is known from Japanese Utility Model Application Publication No. 55-59924, etc., but in this type of case, when the front plate is opened, the front plate is attached to the outside. When a traction force is applied, a separation force acts between the back of the front plate and the rear wall of the case body, and the engagement protrusion that integrates the two is disengaged from the receiving hole, causing the case body and the back plate to mutually disengage. There was a fear that an unforeseen situation of separation would occur.

The present invention aims to eliminate such defects.

Hereinafter, embodiments of the present invention will be explained in order of manufacturing method with reference to the drawings. First, a pen case body 1 having a dish shape is molded from a hard thermoplastic synthetic resin material, and the front wall of this pencil case body 1 is molded. The magnet device 2 is buried in the.

Separately from this, a rectangular molded core plate 5 is made of a hard thermoplastic synthetic resin material and integrally has thin annular protrusions 4 with pointed apex ridges 3 at several places on the inner surface.
molded into one piece.

Next, the soft thermoplastic synthetic resin inner sheet 7 having the through holes 6 for the projections 4 formed on the center line and the outer sheet 7' having no through holes 6 are superposed,
A cardboard core board 8 is placed between these inner and outer double-sided sheets 7 and 7'.
A pair of core materials 9, 9' on which a sponge core 8' is superimposed and the above-mentioned molded core plate 5 are placed so that the core materials 9, 9' are flat on both sides of the molded core plate 5 with a slight gap between them. and insert the inner and outer double-sided sheets 7, 7' along their entire periphery and core materials 9, 9'. They are welded to each other at the locations between the core plates 5, and the lid plate 11 is attached to one side edge of the fastening portion 10, and the bottom plate 12 is attached to the other side edge.
constitute an exterior member in which these are connected via bendable wire portions 13, 13, respectively, and a magnetic metal fitting 14 is attached to the outer edge of the lid plate 11.

After that, the back wall 15 of the pencil case main body 1 is superposed on the fastening part 10 of the exterior member, and the superposed fastening part 10 and back wall 15 are welded using an ultrasonic welder. By doing this, the top edge 3 of the protrusion 4 is welded to the outer surface of the back wall 15 of the pencil case main body 1, and the bottom plate 12 is attached to the lower surface of the bottom wall of the pencil case main body 1, and the lid plate 11 is attached. Magnetic fitting 1 when closed
4 is attracted to the magnet device 2 to maintain the closed state.

Since the present invention is as described above, it is of course possible to attach the lid plate to the case body very simply and easily, but the two are not simply engaged by the protrusion and the hole, but by ultrasonic welding. Since they are integrated by the ridge, there is no risk of them being easily separated from each other even if a separation force is applied between them.In addition, in the present invention, the protrusions are formed into an annular shape with a pointed top edge. The ultrasonic welding during the above-mentioned attachment has the effect of being able to be performed efficiently, reliably, and firmly.

[Brief explanation of the drawing]

The figures show an embodiment of the case of the present invention, in which Fig. 1 is an overall perspective view, Fig. 2 is a perspective view showing the lid open state, and Fig. 3 is taken along line A-A in Fig. 1. 4 is an exploded perspective view of the exterior member, FIG. 5 is a perspective view showing a state immediately before the case body is superimposed on the exterior member, and FIG. 6 is a cross-sectional view showing the same superposed state. DESCRIPTION OF SYMBOLS 1... Pen case body, 2... Magnet device, 3... Top ridge, 4... Projection, 5... Molded core plate, 6... Through hole,
7... Inner sheet, 7'... Outer sheet, 8...
Cardboard core board, 8'...Sponge core, 9, 9'...Core material, 10...Fixing part, 11...Lid plate, 12...Bottom plate, 13, 13...Bendable line part, 14 ...Magnetic metal fittings.

Claims (1)

[Scope of utility model claims] In a case in which a lid plate for opening and closing the opening of the case body is slidably attached to the back wall of the case body, the case body is molded from a hard thermoplastic synthetic resin material, and the base edge of the lid plate is folded. A fastening part made of a soft thermoplastic synthetic resin sheet is connected to a molded core plate made of a hard thermoplastic synthetic resin material via a flexible wire part, and an annular shape with a pointed top ridge is formed on the inner surface of the molded core plate. A protruding strip is integrally provided, and the protruding strip is made to protrude outward through a through hole made in the synthetic resin sheet, and the fastening portion is stacked on the back of the case body, and the top of the protruding strip is attached to the same back wall. A case made by ultrasonic welding.