DE605837C - Process for forming the ends of fitted glass tubes into Haelsen or skewers - Google Patents

Description

Process for forming the ends of fitted glass tubes into necks or Skewers Glass vessels with skewers at one or both ends (e.g. ampoules) were previously made in the way sat from long glass tubes continuously body were peeled off with skewers.

This method of working had the disadvantage that when it was not uniform Heating or, in the case of uneven glass material, the skewers produced are also uneven became.

It has also already been suggested, custom-made, for manufacture to heat and pull out sufficient pieces of pipe in the middle of two workpieces, whereby the constriction to be made is regulated by inserting thorns. To Yet another suggestion is the fused end of a pipe Insertion of a spike reshaped into a skewer by ejecting the soil.

The production of the constrictions or skewers is according to these two Uniform execution of work processes possible, but difficulties arise when the bodies are to be provided with bottoms or when two-pronged ampoules are required; because in the first case there is loss of glass, and in the second case two bodies must first be fused together before a bottom is formed can.

The invention overcomes these disadvantages and also provides further advantages described below.

The invention consists in a new method for producing such Glass vessels, the details can be seen in the accompanying drawing.

According to the invention, matched pipe sections are heated at the ends, softened and the softened glass mass formed into a skewer by using a pair of tongs reaches around the extreme end of the glass tube and pulls out the soft glass into a skewer. After skewers are made at both ends, the body is made in a known manner by dividing in the middle with flat or round bases or remains after Melting a skewer as a double-skewer ampoule.

The individual operations will now be described.

Fig.r shows a cut piece of pipe that is open on both sides. Of course, a bottom can also be melted down on this beforehand.

Then (Fig. 2) the end of the pipe is heated, softened, if necessary the shoulder somewhat narrowed and somewhat funnel-shaped at the end due to an inserted thorn shaped. It is advisable to insert the mandrel into the tube opening while it is being heated to introduce, which prevents the glass mass from collapsing too much and thereby a thorough softening, especially with one-sided glass material.

Now the end of the pipe (Fig. 3) is pulled out into a skewer using the pliers. For this purpose, grasp the gripper legs of the pliers behind the outer edge of the Tube, while the inner side by a suitably shaped ring is supported. A mandrel is expediently located in the end of the pipe while it is being pulled out, which will be introduced beforehand. The glass is pulled out so far that it comes to rest comes to the thorn. It is advisable to turn the glass tube while pulling it out. The tongs then also rotate at the same angular speed. The thorn is either rotated or just slidable depending on the type of shaping. The end of the pipe can be clamped in any way, but it is practical if that it is clamped between the pliers and the mandrel attachment or support ring, so that as possible little glass waste is produced.

In Fig. 4, the glass body is then provided with flat or round bases. In Fig. 5 a double-speared ampoule is shown, in which a spear comes off and is melted shut, the round blowing of the bottoms occurs as shown in Fig. 6 in the way that a pierced mandrel is used, against the approach of the glass tube end is pulled through the pliers, whereupon air is blown in in a known manner. the Glass bodies can be turned with a spit. It is that way too possible to heat the vitreous itself and then inflate it into any shape.

After this procedure it is possible to create vitreous bodies in a rational manner reshaping without loss of glass. The procedure can be applied for both manual and machine work will. It also allows the greatest uniformity in the manufacture of skewers on ampoule bodies and the like, even when processing dissimilar glass material. the simultaneous molding of the funnel-shaped extension at the end of the spit allows a easy filling of the ampoules because the filling needle can be easily inserted. The present method can be used with the known methods for generating a Connect prepared separation point, but this is not the subject of the invention. When pulling out the skewer (Fig. 3), the spike does not have to go into the Inside to be introduced. Even without this there will be a great evenness of the skewer achieved because the heating of the glass by inserting a mandrel during the Heating can be done thoroughly and perfectly.

Claims (5)

PATENT CLAIMS: i: Process for reshaping the ends of fitted glass tubes into necks or skewers, characterized in that the open end of the glass tube is heated and pulled out to a skewer by a pair of pliers around the end. 2. Procedure according to claim i, characterized in that during the heating of the pipe end a mandrel is expediently introduced from the open end which is subject to machining which protects the glass from collapsing, the pipe end possibly something expands and when pulling out the glass as a system for the glass and as a counter bearing is used for the pliers. 3. Apparatus for performing the method according to claim i and 2, characterized in that the mandrel inserted into the spit pierces is, so that when melting round bottoms or when blowing out the ampoule body air can be blown through it, whereby the skewer is sealed against the mandrel is. 4. Device for performing the method according to claim i and 2, characterized in that that instead of the mandrel when pulling out a support ring correspondingly shaped to the pipe end against which the soft glass is pressed by the forceps. 5. Device for performing the method according to claim i and 2, characterized in that the The mandrel inserted into the inside of the skewer is too slightly conical in shape after the end.