JPH07178761A - Television cabinet - Google Patents

Abstract

PURPOSE:To provide a television cabinet which is constituted in such a manner that the cabinet is formed by a short forming cycle by approx. the same plate thickness as a normal molded article, and in addition, a strong CRT holding part is integrally formed. CONSTITUTION:For a cabinet 10 of a television set integrally equipped with a CRT holding part consisting of a stop boss 14, when the cabinet is formed, a high pressure gas is injected in a cavity of the die for the cabinet, and the above mentioned gas is injected at least in the vicinity of the CRT holding part 14.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a CRT (cathode).
The present invention relates to a casing of a television receiver having a holding portion for holding a ray tube (cathode ray tube), and particularly to a casing of a television receiver suitable for application to a bezel-integrated cabinet or bezel.

[0002]

2. Description of the Related Art A television receiver has a CRT housed in its cabinet.
The screen surface of will face the opening of the bezel. C
A mounting piece is provided at the corner portion of the RT, and the mounting piece is fixedly mounted to the holding portion of the cabinet or the bezel.

Since the weight of a large CRT increases, it is necessary to adopt a strong structure for the mounting portion of the CRT. Therefore, an independent bracket made of a molded body is prepared, and this bracket is attached to the corner portion of the cabinet. As another method, low-foam molding is performed to increase the wall thickness of the holding portion.

[0004]

If a molded bracket made of a separate member is used to mount a large CRT, not only the number of parts is increased, but also a means for fixing the bracket to the cabinet is provided. Needed and cost increased.

The low-foam molding is a method of injecting a resin containing a foaming agent together with a normal resin, but has a drawback that the molding cycle is long and the productivity of molding is deteriorated.

The present invention has been made in view of the above problems, and does not use a bracket formed of a separate member, does not require a long molding cycle such as low foam molding, and retains a CRT. It is an object of the present invention to provide a housing of a television receiver in which the section has sufficient strength.

[0007]

According to the present invention, a molten resin is injected from an injection cylinder through a gate into a cavity in a mold for molding a casing of a television receiver, and in a gas press-fit cylinder. The gas is compressed by a piston, and the compressed gas is injected as high-pressure gas into the cavity through the torpedo and / or the gas injection port, and the high-pressure gas is continuously supplied even after the pressurization of the molten resin is completed, and at least the CRT It is characterized in that the high-pressure gas is injected near the holding portion.

In injection molding in which a molten resin is injected into a mold to mold a housing of a television receiver, high-pressure gas is injected into the mold during injection of the molten resin. A cavity is formed by the gas inside the molded body, and the secondary pressure can be effectively applied to the vicinity of the cavity by using the high pressure gas. Application of such sympress molding involving injection of high-pressure gas has an effect of locally preventing sink marks. Therefore, by applying this to a television receiver housing, particularly a bezel-integrated cabinet or bezel, and injecting high pressure gas at least in the vicinity of the holding portion of the CRT to apply a secondary pressure, the holding portion of the CRT is made firm. It can be a structure.

[0009]

The molten resin is injected into the cavity in the mold from the injection cylinder through the gate, whereby the housing of the television receiver is injection-molded. At the time of such molding, the gas in the gas injection cylinder is compressed by the piston, the compressed high pressure gas is injected into the cavity through the torpedo and / or the gas injection port, and the high pressure gas finishes the pressurization of the molten resin. By continuously supplying after that, a cavity is formed by the high pressure gas at least in the vicinity of the holding portion of the CRT, and the holding portion having high strength is formed integrally with the housing. The CRT housed in the housing is held by the above holding unit.

[0010]

FIG. 1 shows a cabinet 10 of a television receiver according to an embodiment of the present invention. The cabinet 10 has a bezel on the front side thereof, and a bezel-integrated cabinet. I am configuring. A rectangular opening 11 is formed in the bezel portion on the front surface side of the cabinet 10, and the CRT 12 is housed in the cabinet 10 so that the screen surface faces the opening 11.

The CRT 12 is provided with metal mounting pieces 13 on its four corner portions, and these mounting pieces 13 are formed on the four corner portions of the cabinet 10 as shown in FIGS. 2 and 3. It is adapted to be fixed to the retaining boss 14 by a tapping screw. The stop boss 14 is reinforced by ribs 15 and is integrally formed with the thick portions 16 of the four corners of the cabinet 10.

Such a bezel integrated type cabinet 10
As shown in FIGS. 3 and 4, the mold is molded by the dies 19, 20 by the sympress molding method. As shown in FIG. 4, a die portion of the injection cylinder 22 is connected to the gate 21 portion of the molds 19 and 20 for injecting the resin. A screw 23 is held in the injection cylinder 22, and the molten resin 24 is extruded by the screw 23.

Further, a gas press-fitting cylinder 25 is connected to the injection cylinder 22. A piston 26 is slidably held in the gas press-fit cylinder 25. A gas supply source is further connected to the cylinder 26 via a valve 27. In addition, the gas injection cylinder 2
The discharge side of 5 is connected to the torpedo 28 held at the discharge port of the injection cylinder 22. A gas injection port 29 is attached to the tip end side of the torpedo 28. The mold for molding the cabinet 10 is provided with four gates 21 at the corners thereof as shown in FIGS. 2 and 3.

In the structure as described above, the molten resin 24 is injected from the injection cylinder 22 shown in FIG. 4 through the gate 21 into the cavities of the molds 19 and 20. Then, slightly later than the injection of the molten resin 24, the gas in the gas injection cylinder 25 is compressed by the piston 26, and this gas is injected into the cavity through the torpedo 28 and the gas injection port 29. The supply of the gas pressure by the cylinder 25 continues even after the pressurization of the molten resin 24 is completed.

Cabinet 1 molded in this way
A space 32 is formed by the injection gas in the thick portion 16 having a particularly large thickness in the vicinity of the zero gate 21. Then, since the secondary pressure is applied to the thick wall portion 16 through the space 32 by the gas pressure, a pressure without loss is applied to the inside of the corner portion of the cabinet 10.

In the cabinet formed by such sympress molding, since the secondary pressure is applied to the thick portion 16 at the corner portion by the gas, sink marks can be prevented. The thick stop boss 14 can be formed by the gas pressure. That is, conventionally, only the stop boss for screwing the tapping screw having a diameter of 5 mm could be formed, but by applying the secondary pressure by the gas, the boss 14 for screwing the tapping screw having a diameter of 7 mm can be formed. become.

By forming a space 32 in the thick wall portion 16 of the corner and applying a secondary pressure through this space 32, the strength of the corner portion is improved, which causes a heavy weight through the stop boss 14. It becomes possible to securely hold the CRT 12. Therefore, it is possible to design the thickness of the molded article as thick as that of an ordinary molded article and to firmly design the vicinity of the holding portion 14 of the CRT 12. In addition, by adopting such sympress molding, the cycle time does not become long as in low-foam molding, and a large CRT is used.
Cabinet 10 for directly fixing 12 to its holding portion 14
Can be efficiently molded.

Although the present invention has been described with reference to the illustrated embodiment, the present invention is not limited to the above embodiment,
Various modifications can be made based on the technical idea of the present invention.
For example, although the above embodiment relates to a bezel integrated type cabinet, the present invention is also applicable to a bezel having a holding portion for a CRT.

[0019]

As described above, according to the present invention, the molten resin is injected from the injection cylinder into the cavity in the mold through the gate, and the gas in the gas injection cylinder is compressed by the piston to obtain a high pressure. The gas is injected into the cavity through the torpedo and / or the gas injection port, and the high pressure gas is continuously supplied even after the pressurization of the molten resin is completed, and the high pressure gas is at least near the holding portion of the CRT. The present invention relates to a casing of a television receiver which is ejected to have a strong structure.

Therefore, according to the present invention, a CRT having high strength
It is possible to provide a casing of a television receiver that integrally has a holding portion of the. In particular, by continuously supplying high-pressure gas even after the pressurization of the molten resin is completed, CRT
By forming a cavity in the vicinity of the holding portion and applying a secondary pressure through such a cavity, it is possible not only to prevent sink marks in that portion, but also to form a large-sized holding portion. become. Further, according to such a method, it is possible to provide a casing of a television receiver having a short molding cycle and having a plate thickness of about the same as a normal molded product except for the holding portion.

[Brief description of drawings]

FIG. 1 is an external perspective view showing attachment of a CRT to a molded cabinet.

FIG. 2 is a vertical sectional view of a cabinet of a television receiver.

FIG. 3 is a cross-sectional view of the cabinet in the portion where the holding portion of the CRT is formed.

FIG. 4 is a longitudinal sectional view of a main part of a molten resin injection device.

[Explanation of symbols]

 10 Cabinet 11 Opening 12 CRT 13 Mounting Piece 14 Stop Boss 15 Rib 16 Thick Part 19, 20 Mold 21 Gate 22 Injection Cylinder 23 Screw 24 Molten Resin 25 Gas Injection Cylinder 26 Piston 27 Valve 28 Torpedo 29 Gas Injection Port 32 Space

Claims (1)

[Claims] 1. A molten resin is injected from an injection cylinder through a gate into a cavity in a mold for molding a housing, a gas in a gas injection cylinder is compressed by a piston, and the compressed gas has a high pressure. The gas is injected into the cavity through the torpedo and / or the gas injection port, the high-pressure gas is continuously supplied even after the pressurization of the molten resin is completed, and the part where the high-pressure gas is injected is at least the CRT. A housing of a television receiver having a holding unit for holding a CRT, characterized in that the housing is in the vicinity of the holding unit.