JPH0779083A - Onsert - Google Patents

Abstract

(57) [Abstract] [Purpose] The onsert material used to attach parts to the plastic case of an electronic device to promote plastic recycling is a shape memory alloy, so that the onsert at the time of disassembly of the electronic device By cooling and heating, it returns to its original shape that is easy to remove, dismantling and sorting are facilitated, and the workability of disassembling electronic devices and crushing plastics is improved for recycling. [Structure] The screw seat attached to the boss of the plastic case is an onsert made of a shape memory alloy, and when the electronic device is dismantled, the onsert is cooled and heated to return to the original shape that was previously stored and is easy to remove. [Effect] When recycling plastics, the workability of disassembling electronic devices and crushing plastics can be improved, and the time required for disassembling and separating plastics can be greatly shortened, and recycling can be promoted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an onsert that engages with a boss molded in a plastic case for mounting an electronic component in a plastic case for housing an electronic device.

[0002]

2. Description of the Related Art As a screw seat provided for attaching an electronic component to a boss in a molded plastic case, a screw seat has been formed at the same time as the plastic molding by, for example, previously inserting it into a mold during molding. There are metal inserts that are pressed into the boss with ultrasonic waves after molding. There is also an onsert type in which the boss of the plastic case is covered with a crown shape by utilizing the spring property after molding. However, both types fix the metal to the boss of the plastic case and are difficult to separate and remove from the plastic case.

[0003]

When attempting to recycle plastics, it is necessary to design products that can be easily disassembled for recycling. Designs that do not use metal inserts are desirable for plastic cases of electronic devices, but functional metal inserts may be required in some cases. However, when an electronic device is disassembled after its mission and an attempt is made to recycle plastics, a great number of man-hours are required for separation and removal of metal inserts during disassembly and separation, which is a serious obstacle to recycling. In order to overcome this obstacle, a structure that can be easily disassembled and separated, that is, an easy method for separating and removing inserts is an important requirement for recycling.

[0004]

The present invention has been made in view of such a case, and provides an onsert made of a shape memory alloy to be attached after molding as a screw seat for attaching an electronic component to a plastic case. It is in.

[0005]

[Operation] A crown-shaped onsert made of a shape memory alloy is press-fitted into a conical boss of a plastic case at room temperature to cool or heat the onsert at the time of disassembling and separating so that it can be removed from the outer peripheral surface of the boss in advance. By returning to the size and shape stored in the memory, the bite on the boss is weakened and it is easy to remove from the boss.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an example of onsert made of a shape memory alloy according to the present invention. Generally, a conical boss 3 is formed so that the electronic component 2 can be attached to the plastic case 1 of the electronic device. At the tip of the boss 3, a crown-shaped onsert 4 in which a screw hole 5 is formed so that the electronic component 2 can be fixed is press-fitted. The electronic component 2 is fixed to the onsert 4 with a screw 6 and is housed in the plastic case 1. FIG. 2 is a detailed view of an onsert made of the shape memory alloy according to the present invention. Coronary Onsert 4
A plurality of claws 7 project inward, and when the onsert 4 is pressed into the boss 3, the claws 7 bite on the outer peripheral surface of the tip of the boss 3 to fix the onsert 4 to the boss 3. Nail 7
For the size and shape of the boss 3, a shape is remembered in advance so that the bite on the outer peripheral surface of the tip of the boss 3 is weakened and is easily removed. The claw 7 has a shape with an angle so as to bite the outer peripheral surface of the tip of the conical boss 3 at room temperature. Fig. 3 shows an onsert that has returned to its original shape when it was cooled and heated to remove the onsert attached to the outer peripheral surface of the boss 3 when disassembling the electronic device for recycling the plastic case. 4 is shown. That is, by cooling or heating the onsert 4, the overhang angle θ of the claw 7 to the inner surface is increased,
The bite on the outer peripheral surface of the tip of the boss 3 is reduced. Whether to return to the original shape by cooling or to return to the original shape by heating may be determined depending on the distribution of the electronic device and the environment in which it is used.
Needless to say, the same idea can be applied to inserts.

[0008]

The size and shape of the onsert made of the shape memory alloy are stored in advance in a size larger than the outer shape of the tip of the boss. Therefore, when disassembling the electronic device, the onsert attached to the plastic case is cooled or cooled. By heating, the original shape and size are restored and the bite on the boss is weakened and it can be easily removed from the boss, the time for disassembling and separating plastic can be greatly shortened, and recycling can be promoted.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of onsert according to the present invention.

FIG. 2 is a sectional view showing an embodiment of onsert according to the present invention.

FIG. 3 is a cross-sectional view showing the action of onsert according to the present invention.

[Explanation of symbols]

 1 ... Plastic case, 2 ... Electronic component, 3 ... Boss, 4 ... Onsert, 5 ... Screw hole, 6 ... Screw, 7 ... Claw.

Claims (1)

[Claims] 1. In a plastic case for housing an electronic device, a boss molded by a mold is provided with an onsert made of a shape memory alloy as a screw seat and an electronic component is attached to the screw seat, and the electronic device is disassembled for recycling. The onsert according to claim 1, wherein workability of crushing plastic is improved.