http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1485868-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_fbd3cefb4f504c554f2859b7eee1ff4e |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C03B23-0476 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C03B23-049 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C03B23-051 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C03B23-047 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C03B23-049 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C03B23-051 |
| filingDate | 1975-09-05^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1977-09-14^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1485868-A |
| titleOfInvention | Manufacture of glass tubing |
| abstract | 1485868 Glass tubing GENERAL ELECTRIC CO Ltd 5 Sept 1975 [12 Sept 1974] 39832/74 Heading C1M Glass tubing of precise predetermined external dimensions and configuration (49) is formed by supporting vertically a glass tube 8 having external dimensions larger than required, placing over the upper end of tube 8 a tubular die 9 (e.g. of graphite) whose bore 12 has the required dimensions and configuration, heating the die uniformly around its circumference to slightly above the deformation temperature of glass tube 8, and allowing die 9 to descend under gravity and thus shape tube 8 to the required configuration. The tube 8 may be up to 15% larger than is finally required, and is preferably shaped to have a final circular cross-section, although the tube produced may have flutes, grooves or projections thereon. The die 9 preferably comprises a graphite cylinder 9 disposed in a metal (e.g. Cu) sleeve 10. The apparatus used preferably comprises support posts 1, 2, 3, 4 disposed between base 5 and top plate 6. The tube 8 is held by chuck 7, its lower end being supported on a plate 38 which allows horizontal movement of the tube 8. The die 9 is mounted, via rods 21, on a carriage 11 mounted on support rods 1 and 2, the metal sleeve 10 being heated by gas burners 34, 35 also mounted on the carriage 11. In use the carriage 11 descends, supported on posts 1, 2, until arrested by spring 36, the heated die 9 re-shaping tube 8. The tube 8 may have narrow end portions 47, 48 to facilitate mounting of the tube. The descent rate of the die is preferably 10-30 cm./hour, and the rate may be increased by adding a weight to carriage 11, or decreased by provision of a counterweight on a pulley. Instead of heating by burners 34, 35, an electric heating coil may be provided on sleeve 10. |
| priorityDate | 1975-09-05^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
| Predicate | Subject |
|---|---|
| isDiscussedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/compound/CID297 http://rdf.ncbi.nlm.nih.gov/pubchem/substance/SID419559581 |
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