| CPC C03B 23/114 (2013.01) [C03B 23/045 (2013.01)] | 10 Claims |
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1. A positioning device for a preloading ring of a hot forming machine, comprising:
a first holding element with an inner indentation, an outer indentation, and a first rotation axis;
a second holding element with an inner indentation, an outer indentation, and a second rotation axis, the inner indentations of the first and second holding elements facing one another to define an inner tube guide and the outer indentations of the first and second holding elements facing one another to define an outer tube guide;
a base plate, the first and second holding elements movably secured on the base plate at the first and second axes, respectively, with the first and second axes spaced-apart from one another so that the first and second holding elements move between an open position and a closed position,
the first and second holding elements being configured so that, in the closed position, the inner and outer tube guides each enclose a glass tube in the closed position, and
the first and second holding elements being configured so that, in the open position, glass tubes can be moved between first and second holding elements along an axis of symmetry from the outer tube guide to the inner tube guide.
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