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| This is U. S. Patent 4001000 |
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Method of manufacturing a percussion flashlamp
The invention relates to a method of manufacturing a percussion flashlamp in which a metal tube which is closed at one end is sealed to a piece of cylindrical tube glass, during which sealing operation the metal tube is supported by a pin which projects through the tube glass into the metal tube and which holds the closed end of the metal tube above the tube glass. Description The invention relates to a method of manufacturing a percussion flashlamp in which a metal tube which is open at one end and a piece of cylindrical tube glass are positioned relative to each other by means of holding members in such manner that the metal tube extends inside the piece of tube glass with its open end, after which the piece of tube glass and the metal tube are subjected to a sealing operation. Such a method is known. After said sealing operation the metal tube is provided with an anvil and an ignition mass to form an ignition device, and the piece of tube glass is filled with a combustible material and a gas maintaining the combustion, after which the tube glass is sealed at its end remote from the ignition device. In the known method, the metal tube and the piece of tube glass are each supported by tongs, in which during the sealing operation the piece of tube glass is present substantially entirely above the metal tube. At the area of the sealing zone the metal tube extends in the piece of tube glass over a distance of approximately 3 mm. The supply of thermal energy to the sealing zone is effected by means of burners which are directed between the tongs which clamp the metal tube and the lower side of the piece of tube glass. Since the tongs which clamp the metal tube serve as a heat conductor, the distance between the lower side of the piece of tube glass and the tongs for the metal tube should be comparatively large so as to enable a uniform heating of the glass and the metal in order that it is achieved that at the instant of sealing the temperature of the metal and the glass be substantially the same. This requirement involves the drawback that for the manufacture a larger length of tube is required than is necessary for a good operation of the ignition device. | U. S. Patent Attorneys Dunlap, Grubb & Weaver, P.C. 1200 G Street NW, Suite 800, Washington, District of Columbia 20005 U.S.A. "Innovative Lawyers for Innovative Businesses" Cahn & Samuels, LLP 1100 17th Street, NW, Suite 401, Washington, District of Columbia 20036 U.S.A. Attorney at Law Christopher & Weisberg, P.A. 1455 Pennsylvania Avenue, N.W., Suite 100, Washington, District of Columbia 20004 U.S.A. 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