JPH0120759Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stem mount device for sealing the neck of a cathode ray tube with a stem.

2. Description of the Related Art When sealing the neck of a cathode ray tube used in a television receiver or the like, a special jig called a stem mount device as shown in FIGS. 1 and 2 has conventionally been used. A hollow portion 4 is formed in the center of the stem mount device 1, into which a tip tube 3 of a stem 2 is inserted. A plurality of stem pin holes 6 corresponding to the number of stem pins 5 are provided on the upper surface of the stem mount device 1 . The stem 2 is supported by the stem mount device 1 by the stem pin 5 inserted into the stem pin hole 6.

The stem sealing process using this device is as follows. As shown in FIG. 1, the tip tube 3 of the stem 2 is inserted into the hollow part 4 of the stem mount device 1, and after the stem 2 is supported by the stem mount device 1 by the stem pin 5, the neck of the cathode ray tube is 7 is placed in the stem mount device 1 at a predetermined position, and while rotating the cathode ray tube, the portion of the neck portion 7 facing the stem 2 is burnt with a burner 8. In this way, as shown in FIG. 1, the portion of the neck portion 7 that is joined to the stem 2 is melted and recessed inward, and the neck portion 7 is fused to the stem 2.
At this time, the outer diameter of the stem mount device 1 is constant and is only slightly smaller than the inner diameter of the neck part 7, so the lower side of the part of the neck part 7 that is fused to the stem 2 is attached to the stem mount as shown in the figure. Outer surface 9 of device 1
I get pecked at. In this state, a worker removes unnecessary glass from the lower part of the stem called the cullet 10 of the neck portion 7 using, for example, tweezers. However, since this conventional stem mount device does not have any means to speed up the fall of the cullet 10 during fusion, the thickness of the glass when it falls is quite thick, and even removal with tweezers is not sufficient to remove it. There were cases where there was no such thing.

On the other hand, nitrogen gas is sent from the hollow part 4 of the stem mount device, and is sprayed into the space formed between the stem 2 and the upper part of the stem mount device 1 and the neck part 7, and the nitrogen gas is sprayed into the space below the stem in the neck part 7. A method of drilling a hole in the corresponding part and burning it out with a burner has also been proposed, but even in this case, the lower part of the stem of the neck part 7 sticks to the outer peripheral surface 9 of the stem mount device 1 and is difficult to fall off, and the neck part 7 Since the glass at the bottom of the stem is relatively thick, it is difficult to burn it out with the burner flame just by blowing nitrogen gas.

In this way, when using a conventional stem mount device, the cullet itself sticks to the outer circumferential surface of the stem mount device during fusion and does not fall easily, and the glass at the part to be cut is thick. There was a problem in that the cullet could not be easily separated and removed from the neck.

The present invention provides a stem mount device that improves the above-mentioned drawbacks.

Embodiments of the stem mount device according to the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIGS. 3 and 4, the outer circumferential surface 13 of the stem mount device 11, which is provided with the hollow portion 12 into which the tip tube 3 of the stem 2 is inserted, is placed on the base side of the stem mount device 11. It is formed into a tapered shape whose diameter decreases toward . The angle of the taper may be arbitrary, and can be selected, for example, from 30' to 120'. A plurality of vertical grooves 14 are provided on this outer circumferential surface 10 at equal intervals if possible. The number of vertical grooves 14 may be arbitrary, and for example, 6 to 12 is suitable.
Further, the shape of the vertical groove 14 can be arbitrarily selected such as V-shape, U-shape, or any other shape. A plurality of stem pin holes 15 into which the stem pins 5 are inserted are formed on the upper surface of the stem mount device 11 facing the stem 2, and a plurality of stem pin holes 15 in the radial direction communicating with the stem pin holes 15 and penetrating from the hollow portion 12 to the outer circumferential surface 13 are formed. A hole 16 is formed. The bottom surface of this hole 16 serves as a surface for receiving the stem pin 5. On the other hand, the inner diameter of the hollow part 12 is selected to be larger than the outer diameter of the chip tube 3, so that the hollow part 12
With the tip tube 3 inserted therein, a gas flow path is formed between the side wall of the hollow portion 12 and the tip tube 3 for introducing a nonflammable gas such as nitrogen gas, which will be described later. Further, a plurality of protrusions 17 are provided in the hollow portion 12 for regulating the position of the tip tube 3, that is, for positioning the tip tube 3 at the center of the hollow portion 12.

When performing sealing using the stem mount device 11 having such a configuration, as shown in FIG.
The tip tube 3 of the stem 2 is attached to the stem mount device 11.
With the stem pin 5 inserted into the hollow part 12 and the stem pin hole 15, the cathode ray tube is equipped so that the stem 2 and stem mount device 11 enter the neck part 7 to a predetermined position, and the cathode ray tube is rotated. While doing so, the portion of the neck portion 7 facing the stem 2 is burned with a burner 8. At this time, for example, nitrogen gas 18 is introduced through a gas passage formed between the side wall of the hollow part 12 and the chip tube 3, and is connected to the stem 2 of the neck part 7 through the space between the stem 2 and the upper surface of the device 11. Spray from the inside onto the part 10a below the part to be sprayed. The burner 8 melts the portion of the neck portion 7 that is joined to the stem 2, and the neck portion 7 is fused to the stem 2. By blowing nitrogen gas 18 from inside, a hole is formed in the cut portion of the neck portion 7, that is, in the lower portion 10a of the stem. If another burner (not shown) is applied to this hole, a cut will be made through this hole as the cathode ray tube rotates, and the entire circumference of the neck portion will be torn apart.

According to this stem mount device 11, since the outer circumferential surface 13 is tapered, the lower side of the welded portion of the neck portion 7 with the stem 2 is attached to the outer circumferential surface 13 during welding.
This has the effect of increasing the falling speed of the cullet 10, and at the same time, by having the vertical grooves 14 on the outer circumferential surface 13, the contact area between the outer circumferential surface 13 and the cullet 10 is reduced, reducing friction when the cullet 10 falls. Since the resistance is reduced, the cullet 10 hangs down more due to the synergistic effect of the two, and the thickness of the glass in the portion 10a of the neck portion 7 corresponding to the lower side of the stem 2 can be made considerably thinner. Therefore, when the nitrogen gas 18 is blown, the lower portion 10a of the stem easily swells and a large hole is formed. At this point, most of the glass can be removed, and the glass remaining on the outer peripheral surface 13 can also be burned off by the burner. This causes the cullet 10 to fall automatically.

Further, since the radial hole 16 communicating with the stem pin hole 15 penetrates from the hollow portion 12 to the outer peripheral surface 13, it is easy to remove dirt from the receiving surface of the stem pin 5 (bottom surface of the hole 15). At the same time, especially when nitrogen gas 18 is introduced, a part of the nitrogen gas blows out through this hole 16 and flows into the cullet 10.
This can prevent the cullet from coming into contact with the outer peripheral surface 13, and the falling speed of the cullet during welding can be further increased. Furthermore, since a plurality of protrusions 17 are provided on the side wall of the hollow part 12, the tip tube 3 can be correctly positioned in the center, and the flow rate of nitrogen gas can be uniformed over the inner circumference of the hollow part 12. You can make it happen.

In addition, as shown in FIG.
In addition to the configuration of 1, a stepped portion 19 can also be provided at the top of the stem mount device 11. By forming such a stepped portion 19, the contact area of the cullet 10 with the outer peripheral surface 9 of the stem mount device 1 can be reduced, so that the cullet 10 can fall more easily.

As mentioned above, the stem mount device according to the present invention has a tapered outer circumferential surface and is provided with vertical grooves, so that the cullet can be dropped much more easily than when using a conventional stem mount device. . Therefore, the work of removing the cullet from the stem mount device after sealing the stem of the cathode ray tube becomes easy, so that the production efficiency of the stem sealing process can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional stem mount device, FIG. 2 is a perspective view thereof, FIG. 3 is a sectional view showing an embodiment of the stem mount device according to the present invention, and FIG. 4 is a perspective view thereof. FIG. 5 is a sectional view showing another embodiment of the present invention. 1 and 11 are stem mount devices, 2 is a stem,
3 is a tip tube, 4 and 12 are hollow parts, 7 is a neck part, 9 and 13 are outer peripheral surfaces, and 14 is a vertical groove.

Claims (1)

[Scope of utility model registration request] In a stem mount device for sealing the neck portion and stem of a cathode ray tube, the outer circumferential surface is tapered so that the diameter becomes smaller toward the base side of the stem mount device, and a plurality of vertical grooves are provided on the outer circumferential surface. 1. A stem mount device, characterized in that a space between a tip tube in a hollow portion provided inside the stem mount device and a side wall of the hollow portion is used as a gas passage for blowing gas to the cut portion of the neck portion.