JPH10213122A - Attaching and detaching device of metal nuts on plastic main body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attach and detach metal nut simply and easily by fixing the nut fitted into a plastic main body by elastically locking each spring tooth of an outer tooth- shaped toothed belleville spring on a side wall of a belleville spring chamber. SOLUTION: When an outer tooth-shaped toothed belleville spring 2 is used, this belleville spring 2 faces the inside of an upper end opening of a belleville spring chamber 7 above a nut 5, and then the belleville spring 2 is pressed down sequentially due to pressing pressure of a pressing cylinder 8. A leg support part 3 of the belleville spring 2 collides against and stops on a top face of a nut 5, respectively, the nut 5 fitted into a nut chamber 6 is locked and fixed securely due to elastic locking of each spring tooth of the belleville spring 2 on a side wall of the belleville spring chamber 7. Next, when the nut 5 is removed and separated from a plastic main body 9, a central part of the belleville spring 2 is pressed from above to invert and deform each spring tooth 4 due to the inversion with each leg support part 3 as a support point. At this time, each spring tooth 4 is deformed, released and separated from the locking on a wall face of the belleville spring chamber 7 so that the nut 5 can be separated and removed easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for attaching and detaching metal nuts to and from a plastic body using an external toothed disc spring. The present invention relates to a retaining device.

[0002]

2. Description of the Related Art Conventionally, metal nuts have been mounted and fixed in a plastic main body (core material) by molding and embedding. For this reason, when recycling the plastic body, it is necessary to remove the embedded metal nuts, which requires enormous labor.

[0003]

Therefore, disposal through a designated contractor is a major social problem at present. Therefore, there is a demand for a reasonable apparatus for attaching and detaching metal nuts to and from the plastics body so that the metal nuts can be easily attached to, detached from, and separated from the plastics body.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and its gist is to form a circular plate having a hole in the center into a conical shape so that a load is applied in the vertical direction. A plurality of spring teeth are integrally formed on the outer periphery of the disc spring with slanting upwards or a plurality of slanting upwardly integral spring teeth and a plurality of slanting downward integrally supporting legs are interposed with the support legs. The nut fitted in the nut chamber of the plastics body is engaged with the disc spring chamber to the side of the disc spring chamber of each spring tooth of the external toothed disc spring using the externally toothed disc springs configured as described above. This is a device for attaching and detaching metal nuts to and from a plastics main body, wherein the metal nuts are fixed by elastic locking of the nuts and the nuts can be easily unlocked and separated by reversing the disc springs. Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, as shown in FIG. 1, a disk 2a having a hole 2b in the center is formed into a conical shape so as to apply a load in the vertical direction, as shown in the sectional view in the diameter direction of FIG. In the spring 2, a plurality of spring teeth 4 are respectively attached to the outer periphery of the disc spring 2 obliquely upward with the support legs 3 interposed therebetween (FIGS. 1 and 2).
Alternatively, a disc spring with external teeth is formed by integrally forming a plurality of spring teeth 4 integrally inclined upward and a plurality of support legs 3 integrally inclined downward (FIG. 4). The device for attaching and detaching metal nuts to and from the plastics body of the present invention is constructed using the above-mentioned disc spring 1 with external teeth as described below. That is, first, the nut 5 is fitted into the nut chamber 6 of the plastics main body 9. Then, the externally toothed conical disk spring 1 is disposed in a state of a chain line a facing the inside of the upper end opening of the disk spring chamber 7 above the nut 5 as shown in FIG. Then, the externally toothed disc springs 1 are sequentially pushed down by the pressing by the pressing cylinder 8 in FIG. At this time, the disc spring 1 is engaged downward with the tip of each spring tooth 4 engaged with the side wall surface in the disc spring chamber 7 and curved. When the disc spring 1 is in the state shown by the solid line B in FIG. 3 and each of the legs 3 abuts against the upper surface of the nut 5, the nut 5 fitted in the nut chamber 6 is engaged in the disc spring chamber 7. The spring teeth 4 of the externally toothed disc spring 1 are firmly and firmly prevented from falling off by elastic locking of the spring teeth 4 to the side wall of the disc spring chamber 7. Therefore, as shown in FIG.
It is firmly attached and fixed by bolting. Next, when separating and disassembling the nut 5 from the plastics main body 9 to separate it, the central part of the disc spring 2 of the externally toothed disc spring 1 with the solid line B in FIG. By using the support legs 3 as a fulcrum, the upper and lower parts are inverted and deformed downward to the state of the chain line C. At this time, each of the spring teeth 4 is simultaneously deformed from the solid line state to the chain line state in FIG. 3 to easily release and separate from the locking of the wall surface of the disc spring chamber 7. Can be performed completely easily. As the externally toothed disc spring 1, the spring shown in FIG. 4 which is an embodiment in which a plurality of spring teeth 4 and a plurality of support legs 3 are separately provided may be used. Also spring teeth 4
It is desirable that the tip has a sharp shape to improve the locking function.

[0006]

As described above, the present invention has an excellent effect that a plastic body such as a seat plate of a chair and a metal nut can be easily and securely and securely removed and securely removed. is there. Because of that, there is no trouble in recycling and the workability is good and it is economical. Further, since the present invention uses a disc spring that is easy to manufacture,
A spring property having a relatively large load capacity in a small space and high utility value can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a disc spring with external teeth of the present invention.

FIG. 2 is a perspective view of a disc spring with external teeth of the present invention.

FIG. 3 is a perspective view showing another embodiment of the disc spring with external teeth of the present invention.

FIG. 4 is a vertical sectional front view of a main part of the apparatus of the present invention.

[Explanation of symbols]

 B Chain line B Solid line C Chain line 1 Disc-tooth spring with external teeth 2 Disc spring 2a Disk 2b hole 3 Leg 4 Spring tooth 5 Nut 6 Nut chamber 7 Belleville spring chamber 8 Pressing cylinder 9 Plastic body 10 Fixture 11 Bolt

Claims (1)

[Claims] 1. A conical disk spring 2 having a hole 2b having a hole 2b formed in a conical shape to apply a load in a vertical direction. A plurality of spring teeth 4 are formed on the outer periphery of the disk spring 2. An externally toothed toothed disc spring 1 in which a plurality of spring teeth 4 integrally inclined obliquely upward and a plurality of integrally supported leg portions 3 obliquely downward are used integrally with the respective support legs 3 interposed therebetween, The nut 5 fitted in the nut chamber 6 of the plastic body 9 is fixed by elastic locking of each spring tooth 4 of the externally toothed toothed disc spring 1 engaged in the disc spring chamber 7 to the side wall of the disc spring chamber 7. A device for attaching / detaching metal nuts to / from a plastics main body, which makes it possible to easily release and unlock the nut 5 by reversing the disc spring 2.