Electric lamp and discharge devices – With envelope – Having base and connector
Patent
1984-05-03
1986-10-21
Dixon, Harold
Electric lamp and discharge devices
With envelope
Having base and connector
313315, H01J 548
Patent
active
046187995
ABSTRACT:
An improved flashlight bulb in which excessive wandering of the glass envelope with respect to the filament during the sealing phase of manufacture is prevented by fusing a spacer bead to the wires supporting the filament, the diameter of the spacer bead being only slightly less than the inside diameter of the glass envelope, so that lateral movement of the glass envelope with respect to the filament is limited by the spacer bead. In the preferred embodiment, the spacer bead is an elongated bead that extends from approximately 0.040 inch of the filament to the base of the bulb. In an alternative embodiment, the wires within the bulb are fused to a sealing bead which is spaced from the spacer bead. In yet another alternative embodiment, a stack of beads extends from a point near the filament to the base of the flashlight bulb. Because the filament lies on the axis of the cylindrical envelope in flashlight bulbs produced in accordance with the invention, the flashlight bulbs greatly improve the pointing and beam forming abilities of most flashlights.
REFERENCES:
patent: 401444 (1889-04-01), Wightman
patent: 1158928 (1915-11-01), Keyes
patent: 1951423 (1934-03-01), Korengold
patent: 2235515 (1941-03-01), Carpenter
patent: 2556059 (1951-06-01), Braundorff
patent: 3027481 (1962-03-01), Baber et al.
patent: 3209188 (1965-09-01), Freeman
patent: 4145631 (1979-03-01), Saito
Carley
Dixon Harold
McKown Daniel C.
LandOfFree
Flashlight bulb does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flashlight bulb, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flashlight bulb will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1291708