US 4,571,252 AGranted

Lamp glass envelope and method for manufacture a lamp glass envelope

AssigneeGeneral Electric Company

InventorRaymond J. Noe

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Abstract

A method for producing the type lamp glass envelope used in a reflector lamp is disclosed which employs a ribbon machine. Said ribbon formed lamp glass envelope includes a cylindrical neck portion terminating at one end in a curved reflector portion closed by an integral flattened face portion of lesser curvature with light distributing elements being formed on the exterior surface of said face portion. In its preferred embodiments, the reflector portion of said lamp glass envelope is of the PAR type which can further include truncation of the parabolic shape with opposing substantially flattened parallel surfaces as well as face portions for said lamp glass envelope which can be circular or rectangular in shape. A novel mold construction permitting said lamp glass envelope to be blown on a ribbon machine includes a pair of cooperating halves to form the sides of the curved glass envelope in a central cavity and which terminate at the ends of said cavity in a separate curved or flat base part which undergoes reciprocal motion in a vertical direction during said manufacturing process.

Claims6

Dependent claims

A method of continuously forming a blown glass envelope for a reflector type lamp from a molten ribbon of glass supported on a moving conveyor which comprises:

(a) blowing a portion of the glass from said molten ribbon into the central cavity of a single multi-part mold, said mold including a pair of cooperative halves forming the curved reflector portion of said blown glass envelope by encircling the molten glass while being blown and which mold further includes a separate base part located at the lower end of said cavity forming a flattened face of lesser curvature in said blown glass envelope having light distributing elements on the exterior surface,
(b) said base part being provided with reciprocal motion in a vertical direction,
(c) having the base part of said mold move upwardly and remain in an upward position while the glass envelope is being blown to form all structural features in said glass envelope but then move downwardly and release the face of the solidified blown glass envelope before the mold halves are opened,
(d) opening the mold halves to release the sides of the solidified blown glass envelope, and
(e) severing the blown glass envelope from the moving glass ribbon.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/663,269Filed 22 Oct 1984 · division
Priority: 1 Aug 1983
Granted: 18 Feb 1986
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H01K 1/28
Details: envelopes; Vessels
C03B 9/12
Blowing glass; Production of hollow glass articles: starting from a ribbon of glass; Ribbon machines
C03B 9/20
Blowing glass; Production of hollow glass articles: in "vacuum blowing" or in "vacuum-and-blow" machines
C03B 9/31
Details of blowing glass ; Use of materials for the moulds: blowing laminated glass articles or glass with enclosures, e.g. wires, bubbles