Filament-centering mounting for flashlight bulbs

Details Filament-centering mounting for flashlight bulbs Filament-centering mounting for flashlight bulbs

1984-12-06

1987-02-17

Moore, David K.

Electric lamp and discharge devices

With envelope

Having base and connector

313315, 339144R, 339146, H01J 548, H01J 550

Patent

active

046442200

ABSTRACT:
A stiffener is bonded to the bead of the flashlight bulb and extends along and between the pins. The stiffener includes indexing surfaces for use in laterally positioning the stiffener and flashlight bulb. An insert is bonded into a PR base so that the exposed end of the insert is a prescribed axial distance from an axial reference surface of the PR base. The insert includes a first set of indexing surfaces that center the insert in the PR base. The insert also includes a second set of indexing surfaces for receiving and centering the indexing surfaces of the stiffener with respect to the insert. The stiffener is inserted into the insert far enough that the bead of the flashlight bulb contacts the exposed end of the insert, thereby assuring that the filament is a prescribed distance from the axial reference surface of the PR base. A tight sliding fit between the stiffener and the insert assures that the stiffener is centered within the insert, which in turn is centered within the PR base. Through these means the filament of the flashlight bulb is accurately and repeatably located with respect to the PR base.

REFERENCES:
patent: 2821649 (1958-01-01), Geiger
patent: 3262001 (1966-07-01), Rijckeart
patent: 3631379 (1971-12-01), Wright

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