JPS5854091B2 - How to fuse the exhaust pipe to the bottom side of the outer bottle of a thermos flask - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method suitable for machining for fusing a homogeneous exhaust pipe to the bottom side of a glass outer bottle of a thermos flask.

As shown in FIG. 1a, the conventional method is to hold the exhaust pipe 2 in contact with the bottom side surface of the outer bottle 1 almost perpendicularly, and to rotate the outer bottle 1 around the axial direction 3 of the exhaust pipe. Heat is applied from the inside and outside to fuse the corresponding joint, and air is forced through the exhaust pipe 2 to open the softened wall of the corresponding joint on the outer bottle 1, thereby creating a gap between the exhaust pipe 2 and the outer bottle 1. The middle part 4 of the exhaust pipe 2 is heated and softened as shown in FIG. It is a process of bending the outer bottle 1 so that the outer bottle 1 is held obliquely and rotated around the axial direction 3 of the exhaust pipe 2. The holding mechanism for this purpose is complicated, and a process of bending the middle portion of the exhaust pipe 2 after welding the exhaust pipe 2 to the outer bottle 1 is also required.

The present invention solves the above-mentioned drawbacks, and an embodiment of the present invention will be described with reference to the drawings. While the outer bottle 1 is not rotated about the central axis 5 parallel to the axial direction of the bottle 11, the portion to be fused is heated and softened from within or from the outside of the outer bottle 11, and the rotation is stopped, as shown in Fig. 2b. A metal rod-shaped press mold 6 with a rounded tip located on the central axis 5 is lowered from the bottle mouth to form a bottomed cylindrical shape having a cylindrical portion with an inner and outer diameter approximately the same as the exhaust pipe to be fused. A bulging portion 7 is formed.

However, since it is possible to form the bulging portion 7 using only the heating means, it is needless to say that there is no need to use the press die 6 in this case.

Next, as shown in FIG. 2c, one end of the exhaust pipe 12 is held in contact with the projecting wall of the bulging portion 7 and rotated to heat and fuse the corresponding contact portion, and as the rotation continues, as shown in FIG. 2d. As shown, the projecting wall is opened by heating and fusing from the inside of the outer bottle 11 with a thin flame, and the fusion of the exhaust pipe 12 to the outer bottle 11 is completed.

As described above, according to the exhaust pipe welding method of the present invention, since it is sufficient to perform eccentric movement while holding the outer bottle vertically, the holding mechanism is simpler than in the case of needle holding, and the intermediate part of the exhaust pipe No bending process is required.

Therefore, the present invention provides a method suitable for machining that allows an exhaust pipe to be fused to the bottom side of an outer bottle at a very low cost.

[Brief explanation of the drawing]

Figure 1a"b shows the conventional exhaust pipe fusion method, Figures 2a-d (
The partially cutaway views (other than FIG. 2a) show an exhaust pipe fusion method according to an embodiment of the present invention. 1. 11 is an outer bottle, and 12 is an exhaust pipe.

Claims (1)

[Claims] 1 Hold the outer bottle vertically with the bottom facing down, and while rotating the bottle about the perpendicular line passing through the area to be fused on the exhaust pipe on the outer surface of the bottom of the bottle, heat and soften the area to be fused on the exhaust pipe, and rotate. is stopped, the pressing mold is lowered to bulge the part to be fused to the outside of the bottle, one end of the exhaust pipe is held in contact with the projecting wall of the bulged part from the outside, and the shaft is A method for welding an exhaust pipe to the bottom side of an outer bottle of a thermos flask, characterized by heating and fusing the corresponding contact part while rotating around , and heating and fusing the protruding wall to open the projecting wall while continuing the rotation.