GB200050A - Improved method of manufacture of electric glow lamp bulbs - Google Patents

Abstract

200,050. Monnier, A. M. June 29, 1922, [Convention date]. Forming electric-lamp bulbs.-In the manufacture of electric lamp bulbs without an apparent sealing-pip, a number of bulbs a<1>, a<2> are blown simultaneously in a mould, the blank terminating in cylindrical portions c, d. An exhaustion tube f is fixed on to the part c, which is then divided at the neck b<1> from the blank, and formed into a bulb with the usual sealing-pip, as shown in Fig. 5. A glass neck j carrying a filament is inserted in the bulb a<1> and an exhaustion tube k, fused on, as shown in Fig. 7. The bulb a' is then parted from the blank at b' and exhausted and sealed. The bulb a<2> is then treated in a similar manner. By moulding several blanks at once much thinner walls can be obtained than by blowing the bulbs singly.