JPH0468252B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for fixing a metal ring to a glass pipe for use in a closed container such as a purifier.

Prior Art Generally, even if a metal ring is connected to the end of a glass pipe that has been softened by heating, there is a drawback that the glass pipe will break when it cools down because the thermal expansion coefficients of the glass pipe and the metal ring are different. .

In order to eliminate this drawback, the inner diameter of the metal ring and the outer diameter of the glass pipe are made approximately equal, and adhesive or sealant is applied to the inside of the metal ring, and the end of the glass pipe is pushed in and fixed. A method is being taken.

Problems to be Solved by the Invention However, with this method, even if the glass pipe is pushed into the metal ring quite forcefully, if the connecting part is turned to fit the threading on the outer periphery of the metal ring to the threading on the connecting part, it will not work. However, there was a drawback that the metal ring rotated together, causing the glass pipe and metal ring to become unattached, resulting in leakage.

Means for Solving the Problems In order to solve the above problems, the present invention includes a step of heating at least one end of the glass pipe body, and a molding section at the heated end of the glass pipe body. A step of pressing and stamping with a metal ring having a taper with a small inner diameter and a large outer diameter on the inner surface and a threaded outer surface, and pressing the metal ring and the stamping part into the glass pipe body. separating it from the heated end; cooling the heated end of the glass pipe body; and applying a sealant or adhesive to the inner surface of the metal ring and fixing it to the cooled end of the glass pipe body. It is characterized by a method of fixing a metal ring to a glass pipe consisting of.

Effect According to the present invention, the end of the glass pipe is heated, and the heated end is pressed with a metal ring having a tapered or stepped portion on the inside to shape the inner surface of the metal ring. After the glass pipe is attached, the heated end of the glass pipe is cooled, and a metal ring whose inner surface is coated with an adhesive is fitted to the cooled end of the glass pipe. The pipe and metal ring are firmly attached.

Embodiment FIG. 1 is a diagram for explaining a method of fixing a metal ring to a glass pipe according to an embodiment of the present invention.
First, as shown in FIG. 1a, a taper is provided on the inner surface 2a of the glass pipe 1 so that the outer diameter is large and the inner diameter is approximately the same as the outer diameter of the glass pipe 1. A metal ring 2 provided with a thread 3 is fitted therein. Then, the end portion 1a of the glass pipe 1 is heated by a heater 4 such as a gas burner. Furthermore, when the end 1a of the glass pipe 1 becomes red hot and becomes soft as shown in FIG. End portion 1a of glass pipe 1 heated by pusher 5
After pushing and expanding the metal ring 2 from the inside to the outside, remove the stamping part 5 and insert the metal ring 2 as shown in Figure 1c.
When removed from the heated end 1a of the glass pipe 1, the end 1a of the glass pipe 1 expands outward, so this end 1a is cooled as it is. Next, as shown in FIG. 1d, when an adhesive or sealant is applied to the inner surface of the metal ring 2 and the metal ring 2 is pressed against the cooled end 1a while being twisted, the metal ring 2 is strongly fixed to the end portion 1a of the glass pipe 1.

In addition, when applying the above method to the other end 1b of the glass pipe 1, the metal ring 6 is fitted to the glass pipe 1 as shown in FIG. , d is implemented and similarly fixed.

With this configuration, the metal rings 2 and 6 are firmly fixed to the glass pipe 1, so that the threading 3 on the outer surface 2a of the metal ring 2
Another advantage is that even if the threads of other connecting members are fitted and rotated, the fixation of the metal ring 2 will not loosen, and there is no risk of leakage occurring between them.

FIG. 2 is a sectional view of a metal ring according to another embodiment of the present invention. In this embodiment, a stepped portion 7 is provided on the inner surface 2a of the metal ring 2, and this stepped portion 7 is
Either a thread 8 is provided as shown in FIG. 2b, or a projection 9 is provided as shown in FIG. 2b.

By doing this, when the end of the glass pipe 1 is made red hot to soften it and is pressed into shape with the metal ring 2, the shape of the thread 8 or protrusion 9 is formed on the end 1a of the glass pipe 1. After cooling the end 1a of the glass pipe 1, apply an adhesive or sealant to the inner surface of the metal ring 2 and fit it to the end 1a of the glass pipe 1, and the inner surface of the metal ring 1 is threaded. 8 or the protrusion 9 fits into the thread cut or groove stamped on the end 1a of the glass pipe 1, so after the metal ring 2 is fixed to the end 1a of the glass pipe 1, the thread cut 3 of the metal ring 2 is fitted. Even if other connecting members are rotated and fitted, the metal ring 2 will not rotate and loosen.

Effects of the Invention As is clear from the above description, the present invention involves heating at least one end of a glass pipe to soften it, and then stamping this end with a metal ring that is fixed. The metal ring was made into the same shape as the inner surface and cooled, and then the metal ring was fitted and fixed to the end of the glass pipe, so the metal ring was firmly fixed to the end of the glass pipe, and other connecting members were rotated to thread the metal ring. The advantage is that the metal ring will not loosen or leak from the glass pipe even when connected.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the method of fixing a metal ring to a glass pipe according to an embodiment of the present invention, and FIG.
The figure is a sectional view of a metal ring according to another embodiment of the present invention. 1...Glass pipe, 2, 4...Metal ring,
3...Thread cutting, 7...Stepped portion, 8...Thread cutting, 9...Protrusion.

Claims (1)

[Claims] 1. Heating at least one end of the glass pipe body, and stamping the heated end of the glass pipe body with a stamping part so that the inner diameter is small and the outer diameter is large. stamping with a metal ring having a taper on the inner surface and a thread on the outer surface; separating the metal ring and the stamping part from the heated end of the glass pipe main body; and the heating end of the glass pipe main body. A method for fixing a metal ring to a glass pipe, comprising the steps of: cooling the metal ring; and applying a sealant or adhesive to the inner surface of the metal ring and fixing it to the cooled end of the glass pipe body. 2. A method for fixing a metal ring to a glass pipe according to claim 1, characterized in that a metal ring is fixed to the other end of the glass pipe body by the method described above. 3. The method for fixing a metal ring to a glass pipe according to claim 1, characterized in that a stepped portion is formed inside the metal ring, and a cut or a protrusion is formed in the stepped portion.