Multiple filament electric lamp
OwnerLeslie U. Fernandez, IIIinventor
Life of this patent
Estimating the term…
Abstract
A multiple filament incandescent lightbulb automatically places an unused alternate filament in a closed electric circuit upon rupture of an active filament. The alternate filament is placed in a closed circuit by release of an elastically deformed switching member originally held in place by the active filament.
Claims14
An incandescent electric lightbulb mount comprising:
- A. a first filament consisting essentially of conductive material capable of incandescing in a closed electric circuit,
- B. one or more alternate filaments consisting essentially of material capable of incandescing in a closed electric circuit,
- C. leads placing said first filament in a closed electric circuit,
- D. leads placing said alternate filament(s) in an open electric circuit,
- E. one or more switching members, the number of switching members being equal to one less than the total number of filaments in said mount, said switching members having as parts;
- (i) a projection to contact a filament, (ii) an elastic component to make said member elastically deformable, and (iii) a conductive arm to transfer electric current,
- F. a first filament switching member contacting said first filament and a switching member associated with and contacting each but one of said alternate filaments, wherein each of said switching member(s) is held in an elastically deformed first position by its associated filament, each of said switching members being arranged so that upon rupture of a filament the associated switching member moves to an elastically relaxed second position and thereby places an unused alternate filament in a closed electric circuit,
- G. support means for positioning said leads, filaments, and switching member(s).
The lightbulb mount of claim 13 having a first filament with associated first filament switching member, a primary alternate filament with associated primary alternate filament switching member, and a secondary alternate filament.
An incandescent electric lightbulb comprising (1) an envelope;
- (2) a mount containing support means, filaments, and leads;
- and (3) a base for connecting the leads and filament to a source of electric current;
- wherein the improvement is a mount comprising:
- A. a first filament consisting essentially of conductive material capable of incandescing in a closed electric circuit,
- B. one or more alternate filaments consisting essentially of material capable of incandescing in a closed electric circuit,
- C. leads placing said first filament in a closed electric circuit,
- D. leads placing said alternate filament(s) in an open electric circuit,
- E. one or more switching members, the number of switching members being equal to one less than the total number of filaments in said mount, said switching members having as parts;
- (i) a projection to contact a filament, (ii) an elastic component to make said member elastically deformable, and (iii) a conductive arm to transfer electric current,
- F. a first filament switching member contacting said first filament and a switching member associated with and contacting each but one of said alternate filaments, wherein each of said switching member(s) is held in an elastically deformed first position by its associated filament, each of said switching members being arranged so that upon rupture of a filament the associated switching member moves to an elastically relaxed second position and thereby places an unused alternate filament in a closed electric circuit,
- G. support means for positioning said leads, filaments, and switching member(s).
Dependencies are inferred from the claim text.