Sealing articles into a glass envelope and compound holder there

Glass manufacturing – Processes – Reshaping or surface deformation of glass preform

Patent

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Details

65 5926, 65 5928, 65108, 65139, 65154, 65155, 65276, 65288, 65292, 6537415, 29756, 29759, 29760, C03B 2309, C03B 2313, C03B 2318

Patent

active

043436439

ABSTRACT:
A holder (55) for supporting in alignment a plurality of spaced electrodes (18) and (19) to be sealed into a corresponding plurality of envelopes (14) includes a metal base (82) which supports a stripper plate (87). A plurality of posts (36) extend from the base (82) through a plurality of seats (86) in the stripper plate. In preparation for a mass sealing operation the envelopes (14) are placed onto the seats (86) and a pair of the electrodes (18) and (19) are attached to the end of each of the posts (36). A graphite heater plate (61) having a plurality of apertures (72) is joined with the base plate (82) such that the apertures rest in concentric alignment about upper ends of the envelopes (14). An upper weight plate (92) rests on the heater plate (61) to bring weighted guide caps (46) into contact with the electrodes (18) and (19). A current is passed through the heater plate (61) to melt adjacent portions of the envelopes (14) while heat insulating properties of an upper liner (111) protect the metal base (82) and a lower metal plate of the stripper plate (87) from undesirable heat radiation from the heater plate. Both, the weight plate and the upper liner (111) are preferably made of graphite as a material to redirect radiated heat toward the heater plate (61) to increase the efficiency of the sealing operation.

REFERENCES:
patent: 1885690 (1932-11-01), Doyle
patent: 3268317 (1966-08-01), Blust
patent: 3432282 (1969-03-01), Schulz
"POCO Sealing Boats" Advertisement in Solid State Technology, Jun. 1980, p. 57.

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