Apparatus for producing glass tubing of a narrowed diameter
US4818266A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 1986 |
| Grant date | Apr 4, 1989 |
| Priority date | — |
| Expiry date | May 14, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B23/0473
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The method of the present invention consists of the steps of heating an area along the length of a small diameter glass tube while the tube is being rotated, pulling the heated tube using an unidirectional force to rapidly extend the heated area while mechanically maintaining the heat source centrally located along the portion of the tubing being extended. The extended tubing is subsequently cooled and separated at the narrowed portion to produce two capillary tubes. The apparatus of the present invention consists of two independently rotatable, co-axially aligned chucks. The chucks rotate in an essentially simultaneous manner, that is, the speed of rotation of each chuck is essentially the same. Each of the chucks has an adjustable collet thereon adapted to receive and hold a section of glass tubing aligned therebetween. A means of moving one of said chucks away from the other is provided. A moveable heating means is positioned intermediate the chucks. The moveable heating means is adapted to start at the same time and to move in the same direction as the movable chuck, but half the distance that the chuck moves. The moveable heating means provides longitudinal symmetry while the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.