JPS6324289B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an explosion-proof cathode ray tube, and more particularly to a method for manufacturing an explosion-proof cathode ray tube using a shrink-fit reinforcing method in which an annular metal fitting is thermally expanded by heating and inserted into the outer peripheral surface of a cathode ray tube panel. .

Generally, cathode ray tubes implode due to external impact, so in order to prevent this implosion (explosion proof), an annular metal fitting is thermally expanded by heating and inserted into the outer peripheral side of the cathode ray tube panel, and then the annular metal fitting is cooled. It contracts and is firmly fitted over the entire circumference of the outer periphery of the panel. That is, before implosion, the cathode ray tube expands temporarily and rapidly due to the occurrence of cracks, etc., so this expansion is blocked by the annular fitting to prevent fragments from scattering.

Conventionally, an annular metal fitting is attached using a shrink-fit reinforcing method using an annular metal fitting fixing jig as shown in FIG. That is, the annular metal fitting 2 is heated to about 400 to 500°C with an electric furnace or gas burner,
The television set is set on the lug fixing column 4 with reference to the lug 3 for attaching the television set fixed to the annular metal fitting 2. Next, the cathode ray tube 1 is sucked with the image surface facing downward by the suction rubber disc 5, and is transported via the carrying arm 6 above the annular metal fitting 2 set on the lug fixing column 4, and the annular metal fitting 2 After performing planar positioning, the cathode ray tube 1 is vertically lowered and inserted into the thermally expanding annular fitting 2. and,
The image plane of the cathode ray tube is supported and positioned by the cathode ray tube positioning and fixing support 7, and then the annular metal fitting 2
When cooled, the annular metal fitting 2 contracts and is fitted onto the outer peripheral side surface of the panel.

However, for explosion-proof cathode ray tubes, the height dimension h from the reference position of the image surface of the cathode ray tube 1 to the mounting lug 3 differs depending on the type of TV set, so a dedicated annular metal fixture fixing jig must be prepared for each type. Otherwise, the annular metal fitting fixing jig had to be adjusted every time the product type was changed. Also, some cathode ray tubes do not have mounting lugs.
This type has the disadvantage that it is very difficult to support and position the annular metal fitting, and the annular metal fitting fixing jig has a complicated structure.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and it is an object of the present invention to provide a method for manufacturing an explosion-proof cathode ray tube in which cathode ray tubes of the same size can be reinforced by shrink fitting using the same jig.

Hereinafter, the present invention will be explained with reference to illustrated embodiments.

FIG. 2 is a front view showing one embodiment of the annular fitting for carrying out the method of the present invention, and FIG. 3 is a front view showing another embodiment of the annular fitting. The annular metal fitting 10 is provided with projections 11 at four locations on the outer periphery of the longer side. This protrusion 11 may be formed by fixing a plate material as shown in FIG. 2, or may be formed by protruding a part of the annular metal fitting 10 itself as shown in FIG. When the annular fitting 10 is attached to a cathode ray tube, the position of the protrusion 11 in the height direction is always at a constant position from the image plane, which is the support point of the cathode ray tube, for cathode ray tubes of the same size. In addition, 1
2 is a mounting lug.

On the other hand, the annular metal fixture fixing jig includes, in addition to the conventional cathode ray tube position fixing support for positioning the image plane of the cathode ray tube, a protrusion part fixing base for supporting the protrusion 11 as shown in FIG. 4a and b. 13 will be provided. Therefore, when reinforcing the cathode ray tube, the annular metal fitting 10 is heated to thermally expand, and the protrusion 11 is placed and positioned on the protrusion fixing table 13. Next, as in the conventional case, the cathode ray tube 1 is inserted into the annular fitting 10 with the image surface facing downward, and the cathode ray tube 1 is positioned and supported by a cathode ray tube position fixing column (not shown). When the annular metal fitting 10 is cooled in this state, the annular metal fitting 10 contracts and is fitted into the cathode ray tube 1.

In this way, when the annular fitting 10 is fitted to the cathode ray tube 1, the position of the protrusion 11 in the height direction is set at a constant position from the image plane, which is the reference point of the cathode ray tube, for cathode ray tubes of the same size.
Since the positioning of the annular fitting 10 in the height direction is all done using this protrusion 11 as a reference, even if the position of the mounting lug 12 is different as shown in FIGS. Shrink-fitting reinforcement can be done using a metal fixture fixing jig.

The important thing here is that the temperature of the annular metal fitting 10 is 400 to 500℃.
Thermal expansion is about 1.5 mm due to moderate heating, and the thickness of the annular metal fitting 10 is about 0.8 to 1 mm.
It is necessary to maintain a distance of about 2.5 to 3.5 mm. Further, the protrusion length of the protrusion 11 must be determined so that the tip of the protrusion 11 remains on the protrusion part fixing base 13 even after the annular metal fitting 10 contracts.

In the above embodiment, the case where the protrusion 11 is provided only on the long side is explained, but it may be provided on the short side, and the number is not particularly limited to four, and the annular metal fitting Three or more may be provided so as to stably support 10.

As is clear from the above explanation, according to the method for manufacturing an explosion-proof cathode ray tube according to the present invention, cathode ray tubes of the same size can be reinforced by shrink fitting with the same annular fitting fixing jig, which improves work efficiency in terms of equipment. It is also excellent.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a conventional method for manufacturing an explosion-proof cathode ray tube, Fig. 2 is a front view showing an embodiment of an annular fitting for carrying out the method of the present invention, and Fig. 3 is a front view showing another example of an annular fitting. Front view showing the embodiment, FIG. 4a,
FIG. 1B is a schematic front view of main parts showing an embodiment of the method for manufacturing an explosion-proof cathode ray tube according to the present invention. 1... Braun tube, 10... Annular metal fitting, 11...
...Protrusion, 13...Protrusion part fixing base.

Claims (1)

[Claims] 1. Provide multiple protrusions around the outside of the annular metal fitting,
The annular fitting is heated and expanded to position it with reference to the protrusion, the cathode ray tube is inserted into the positioned annular fitting and positioned, and the annular fitting is contracted to fit the annular fitting onto the outer peripheral surface of the cathode ray tube panel. A manufacturing method for cathode ray tubes.