| 摘要 |
<p>857,108. Discharge tubes. WESTING- HOUSE ELECTRIC CORPORATION. July 4, 1958 [July 12, 1957], No. 21465/58. Class 39(1). [Also in Groups XI and XXIII] In a method of sealing a glass tube e.g. the tubulation of an incandescent lamp, discharge lamp or electronic tube, a heated sealing member is brought into contact with and forced through the tube so as to carry with it a mass of glass which forms a layer sealing the tube. Fig. 10 shows the effect for a tube connected to a lamp containing a gas fill under pressure greater than atmospheric after the sealing member 46 has passed through. Apparatus for the process consists of two arms 44, Fig. 1, bridged by the sealing member 46 and carried by arms 42 pivoted on a block 40 bearing a chuck 36 into which the tubulation 32 of the lamp 34 is inserted. The arms 44, which also serve as conductors for the current for heating the sealing member, are urged into cutting relation to the tubulation 32 by springs 48. If desired, the zone of the tubulation through which the sealing member is to pass may be preheated by a gas flame. The path of the heated sealing member through the tube need not necessarily be at right angles to the axis thereof. It is also stated that sealing may be carried out by manually forcing the heated sealing member through the tubulation.</p> |
