JP2001176429A - Explosion-proof reinforcing band for cathode-ray tube, cathode-ray tube and manufacturing method of explosion-proof reinforcing band - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce quantity of material used for explosion-proof reinforcing band and to enhance explosion-proofing effect. SOLUTION: Both ends 1a and 1b of a piece of band-shaped plate 1 are joined into a ring shape with dovetailing, namely by fitting a dovetail groove 2 formed at one end 1a with a dovetail 3 with the other end 1b. Furthermore, by welding along the dovetail joint then, the both ends are fixed to produce on explosion-proof reinforcing band.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an annular explosion-proof reinforcing band for a cathode ray tube wound around the outer peripheral surface of a panel portion of a cathode ray tube, a cathode ray tube using the explosion-proof reinforcing band for the cathode ray tube, and an explosion-proof for the cathode ray tube. The present invention relates to a method for manufacturing a reinforcing band.

[0002]

2. Description of the Related Art In many cases, an explosion-proof reinforcing band is wound around the outer peripheral surface of a panel portion of a cathode ray tube so that an accident does not occur. Generally, the explosion-proof reinforcing band is shown in FIG. As shown in FIG. 3, a metal plate a forming a single horizontally long band body is prepared, and as shown in FIG. 3 (B), it is formed into a rectangular shape along the outer peripheral surface of the panel portion of the cathode ray tube. Then, the two ends are joined to each other via a metal plate b for connection, which is different from the metal plate a forming the band main body, so that an annular body composed of the metal plates a and b is formed.

[0003] Specifically, the joining is performed by aligning the end faces of both ends of a metal plate (band main body) a formed in a rectangular shape, overlaying a connecting metal plate b on that portion, and spot welding. Done. FIG. 4A is a side view showing the explosion-proof reinforcing band c wound on the outer peripheral surface of the panel portion of the cathode ray tube, and FIG. 4B is a front view of the panel portion d.
e indicates each welding point.

After the explosion-proof reinforcing band c is once formed in an annular shape, a high-frequency coil is arranged along the inner or outer circumference thereof, expanded by induction heating, and then mounted on the outer peripheral surface of the panel portion of the cathode ray tube. Thereafter, the panel is fastened to the panel d by tightening the panel by cooling,
Due to the tightening force, the panel portion d is firmly fixed. In this case, the connecting metal plate b naturally has a tightening stress {= Y (: stress at the yield point [N / mm ² ]).
-Thickness t [mm] of metal plate b-Width w [mm] of metal plate b}
Therefore, the connecting metal plate b needs higher strength.

[0005]

By the way, the above-mentioned prior art firstly requires a connecting metal plate b in addition to the metal plate a forming the main body of the explosion-proof reinforcing band. Secondly, there is a problem that a tensile shear force is applied to a welded portion by spot welding, causing local deformation as shown in FIG.

The problem that the amount of the first material used is large naturally leads to an increase in cost, and furthermore, a reduction in weight is prevented, so that it cannot be overlooked. The second problem, the local deformation, is that the metal plate a forming the band body is connected to the metal plate b for connection.
Are formed along the connection metal plate b, because a force F2 in a direction perpendicular to the connection metal plate b acts in addition to a force F1 in a direction (plane direction) along the connection metal plate b. That is, as described above, since the tightening stress is applied to the connection metal plate b, a strength exceeding the tightening stress is required. However, as shown in FIG. 5, a force F2 in the vertical direction is different from the force F1 in the surface direction. Is generated, and as a result, the connection metal plate b is deformed. As a result, the explosion-proof reinforcing band c
Of the panel portion d is hindered, and the explosion-proof effect is reduced. Therefore, in order to secure the required explosion-proof effect, it is necessary to increase the thickness and width of the metal plates a and b, which means that the explosion-proof effect is low compared to the amount of materials used and the like. There is nothing but the need to increase the amount of material to ensure the explosion-proof effect.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem. The present invention has been made to reduce the amount of material used for the explosion-proof reinforcing band and to connect the ends of the band-shaped plates constituting the explosion-proof reinforcing band to each other with a cathode wire. An object of the present invention is to prevent the pipe from being in intimate contact with the panel portion, thereby enhancing the explosion-proof effect.

[0008]

According to a first aspect of the present invention, there is provided an explosion-proof reinforcing band formed by joining both ends of a band-shaped plate and joining them together to form an annular shape. Therefore, according to the explosion-proof reinforcing band of the first aspect, since the end surfaces of the band-shaped plates are joined together by a dovetail, the band-shaped plates can be formed in an annular shape without using another member or welding. Therefore,
Unlike the conventional case, there is no need for a metal plate for connection different from the band-shaped plate, so that the amount of materials used can be reduced, and the cost can be reduced.

Further, it is not necessary to arrange another member on the band-shaped plate for connection, and the end surfaces of both ends of the band-shaped plate are joined together more firmly. Therefore, as shown in FIG. Only the force F1 in the plane direction acts on
There is no fear that the vertical force F2 acts as in the conventional case. Therefore, there is no decrease in the adhesion to the panel due to the conventional deformation, and there is no decrease in the explosion-proof effect.
Therefore, the explosion-proof effect can be improved while reducing the amount of materials used.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention basically provides an explosion-proof reinforcing band by joining both ends of a band-shaped plate with a dovetail and forming an annular shape. It is preferable that the joints are perfectly fixed by connecting them along the joined joints by, for example, welding such as laser welding.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. 1 (A) and 1 (B) are plan views showing main parts of one embodiment of an explosion-proof reinforcing band of the present invention, and FIG. 1 (A) shows both end portions of a band-like plate in a state before joining with a dowel. ,
(B) shows the joined portion of the band-shaped plate after joining and welding by the dowel. FIG. 2 is a side view for explaining that the explosion-proof reinforcing band is not deformed in the direction perpendicular to the surface thereof.

In the drawing, reference numeral 1 denotes a band-shaped plate formed by forming a metal plate material to be a band material into a horizontally long shape, 1a denotes one end of the band-shaped plate 1, and 1b denotes the other end of the band-shaped plate 1. Reference numeral 2 denotes a dovetail formed at one end 1a. Reference numeral 3 denotes a dovetail formed at the other end 1b of the band-shaped plate 1. .

The band-shaped plate 1 is first formed into a rectangular shape along the outer peripheral surface of the panel portion of the cathode ray tube, and
As shown in FIG. 1 (B), the dovetail 2 is fitted into the dovetail groove 3, that is, joined by a dovetail, and further connected by welding such as laser welding along the dovetailed joint. And fix the joint perfectly. Reference numeral 4 denotes the laser-welded portion. Through such a process, the band-shaped plate 1 becomes an explosion-proof reinforcing band. The explosion-proof reinforcing band has a width of, for example, 60 mm and a thickness of 1.0 mm for a 29-inch CRT, and a width of, for example, 70 m for a 32-inch CRT.
m, thickness 1.6 mm.

The band-shaped plate, that is, the explosion-proof reinforcing band 1 whose ends are joined and welded into an annular shape, as in the conventional case, is then provided with a high-frequency coil along its inner periphery or outer periphery. Then, it is expanded by induction heating, and is mounted on the outer peripheral surface of the panel portion of the cathode ray tube in that state, and then the panel portion is tightened by cooling. Then, the explosion-proof reinforcing band 1 is kept fixed to the panel part by the tightening force. As described above, the fastening force F1 in that state is Yp (: stress at the yield point).
[N / mm ² ]) · the thickness of the band-shaped plate 1 t [mm] · the width of the band-shaped plate 1 w [mm]), which acts in the surface direction of the band-shaped plate 1. Therefore, the explosion-proof reinforcing band-like plate 1
Requires higher strength both at the joint and at the other part.

However, since the connection metal plate b (see FIG. 3) required in the prior art is not required in the present invention, the force generated in the direction perpendicular to the surface direction of the band-shaped plate in the prior art shown in FIG. F2 does not occur. As shown in FIG. 2, only a pulling force F <b> 1 in the surface direction of the band-shaped plate 1 acts. Therefore, since the conventional deformation shown in FIG. 5 does not occur, the degree of adhesion between the explosion-proof reinforcing band and the panel does not decrease due to such deformation. Therefore, the explosion-proof effect can be improved.

The advantages of this embodiment are listed below. (1) Since the connection metal plate b (see FIG. 3) required in the related art is not required, the amount of material used can be reduced by that much, and the cost can be reduced by reducing the material cost. Therefore, the weight can be reduced.

(2) Since there is no need to weld the connecting metal plate b to the band-shaped plate 1, no projections due to the connecting metal plate b can be formed on the band surface. Therefore, when the band 1 is mounted on the panel portion of the cathode ray tube, there is no possibility that the panel portion is damaged by the projection.

(3) Since the connection metal plate b is not connected to the band 1, the connection metal plate b deforms not only by the clamping force F1 in the surface direction but also by the force F2 in the direction perpendicular thereto. Therefore, there is no possibility that the non-contact portion with the panel portion due to the deformation is generated and the explosion-proof effect is reduced.

[0019]

According to the present invention, since the end surfaces of the band-shaped plates are joined together by a dovetail, the band-shaped plates can be formed in an annular shape without using another member or welding. Therefore,
Unlike the conventional case, there is no need for a connecting metal plate different from the band-shaped plate, so that the amount of materials used can be reduced, the cost can be reduced, and the weight can be reduced.

Further, since it is not necessary to arrange another member on the band-shaped plate for connection, the end surfaces of both ends of the band-shaped plate are joined together and are more firmly joined. As shown in FIG. Only the force in the surface direction acts, and there is no possibility that the force in the vertical direction acts as in the related art. Therefore, there is no decrease in the adhesion to the panel due to the conventional deformation, and there is no decrease in the explosion-proof effect. Therefore, the explosion-proof effect can be improved without increasing the amount of materials used. Further, since the connecting member does not need to be arranged along the band-shaped plate, no convex portion is formed on the band surface. Therefore, when the explosion-proof reinforcing band is attached to the panel portion, there is no possibility that the convex portion may be damaged.

[Brief description of the drawings]

1 (A) and 1 (B) show an essential part of one embodiment of an explosion-proof reinforcing band of the present invention, and FIG. 1 (A) shows both ends of a band-like plate before joining with a dovetail. Figure showing
(B) is a figure which shows the joining part of the band-shaped board in the state which completed joining and welding by a dowel.

FIG. 2 is an explanatory view showing that the explosion-proof reinforcing band of the present invention does not deform in a direction perpendicular to its surface.

FIG. 3A is a side view of a conventional explosion-proof reinforcing band, and FIG. 3B is a front view of a panel of a cathode ray tube to which the band is attached.

FIG. 4A is a side view showing an explosion-proof reinforcing band wound around an outer peripheral surface of a panel portion of a cathode ray tube, and FIG. 4B is a front view of the panel portion.

FIG. 5 is a diagram showing a problem of the prior art that local deformation occurs.

[Explanation of symbols]

1 ... band-shaped plate (explosion-proof reinforcement band), 1a, 1b
..Ends, 2 ... with grooves, 3 ... with

Claims (3)

[Claims] 1. An annular explosion-proof reinforcing band for a cathode ray tube wound around an outer peripheral surface of a panel portion of a cathode ray tube, wherein one end of the band has a dovetail formed at one end and a dovetail groove formed at the other end. An explosion-proof reinforcing band for a cathode ray tube, comprising a band-like plate, wherein both ends of the band-like plate are joined to form a ring by fitting a dovetail into the dovetail groove. 2. A cathode ray tube having an annular explosion-proof reinforcing band wound along an outer peripheral surface of a panel portion, wherein the explosion-proof reinforcing band has a dovetail formed at one end and a dovetail groove at which the dovetail is fitted at the other end. A cathode ray tube comprising a band-shaped plate formed, wherein both ends of the band-shaped plate are joined to form an annular shape by fitting a dovetail into the dovetail groove; 3. A method of manufacturing an annular explosion-proof reinforcing band for a cathode ray tube wound around an outer peripheral surface of a panel portion of a cathode ray tube, wherein a dovetail groove is formed at one end and a dovetail groove is formed at the other end. A band-shaped plate is prepared, and the band-shaped plate is wound along the outer peripheral surface of the panel portion of the cathode ray tube. A method for manufacturing an explosion-proof reinforcing band for a cathode ray tube, wherein both ends of the band are joined to form the band-like plate in an annular shape.