Process and apparatus for calibrating of glass tube sections

Claim 1

A process for calibrating glass tubing sections, in which a glass tubing section is heated to a softening temperature, shaped to the calibration dimension and allowed to cool, comprising, in that the softened glass, in the particular area of deformation of the glass tubing section clamped at both ends, in the case of outside calibration is pressed against an outside calibrating surface by means of a shaping element guided inside and in helical manner with respect to said glass tubing section, and in the case of inside calibration is pressed against an inside calibration surface by a shaping element guided outside and in helical manner with respect to said glass tubing section, rotatably supporting said calibrating surface in the form of a cylinder along an axis generally parallel to and radially offset from the axis of said glass tubing section.

Claim 7

A device for calibrating of glass tube sections, comprising, frame means, two opposite coaxially mounted and synchronously rotating clamping means on said frame means and adapted to engage the ends of the glass tubing section, means on said frame means for rotating said clamping means, axially displaceable holding means mounted both inside and outside the glass tubing section and comprising a shaping element and a calibration surface oppositely disposed to each other, an axially displaceable heater on said frame means, and means operatively connected to said holding means, said shaping element, said calibration surface, and said heater for simultaneous movement thereof in a direction parallel to the longitudinal axis of a glass tubing section held in said clamping means, said shaping element and said calibrating surface each comprising a rotating roller mounted generally axially parallel to the glass tubing section along respective axes offset from the axis of said glass tubing.

Claim 8

A device for calibrating of glass tube sections, comprising, frame means, two opposite coaxially mounted and synchronously rotating clamping means on said frame means and adapted to engage the ends of the glass tubing section, means on said frame means for rotating said clamping means, axially displaceable holding means mounted both inside and outside the glass tubing section and comprising a shaping element and a calibration surface oppositely disposed to each other, an axially displaceable heater on said frame means, and means operatively connected to said holding means, said shaping element, said calibration surface, and said heater for simultaneous movement thereof in a direction parallel to the longitudinal axis of a glass tubing section held in said clamping means, said shaping element and said calibrating surface each comprising a rotating roller mounted generally axially parallel to the glass tubing section along respective axes offset from the axis of said glass tubing.