Patent ID: 11883885
Assignee: SCHOTT PHARMA SCHWEIZ AG
Field: Machine tools (Mechanical engineering)
Classification: CPC B  C  Y | IPC B  C

Claim 14:
15. A retention chuck for glass pipes, comprising:
a central supply channel having a center line and being configured to allow movement of the glass pipes through the central supply channel along the center line without contacting an internal surface of the supply channel, the central channel having a lower end with an opening;
three clamping jaws arranged at the lower end and evenly distributed around the center line and the opening, wherein the three clamping jaws have a spacing from the center line that is adjustable;
a guiding sleeve associated with and containing one each of the three clamping jaws, wherein each of the clamping jaws is slidingly moveable within the associated guiding sleeve;
an actuation element configured for common adjustment of the spacing of all three of the three clamping jaws, the actuation element having a flange;
three levers, each lever being connected in an articulated manner to the actuation element and to a respective one of the three clamping jaws, wherein each lever comprises a first leg angled with respect to a second leg, wherein the first leg is connected to the actuation element in an articulated manner and the second leg is connected to the respective one of the plurality of clamping jaws in an articulated manner, wherein the first leg has a pin that is slidingly movably guided in a groove in the actuation element, wherein the second leg has a pin that is slidingly movably guided in a groove of the respective one of the plurality of clamping jaws, wherein the actuation element further comprises guiding arms in which the grooves in the actuation element are formed, and wherein the guiding arms protrude radially outward from the actuation element;
a single spring arranged concentrically around the center line; and
a spring stop compressing the single spring between the spring stop and the flange, the single spring being configured and positioned to provide a radially active clamping force to the three clamping jaws towards the center line, the spring stop having a position along the center line that is adjustable to adjust the radially active clamping force.