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US 4,128,864 AGranted
Sealed beam lamp unit
AssigneeGeneral Electric Company
InventorsWarren T. Brussee, William G. Ferris
Life of this patent
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AssigneeGeneral Electric Company
InventorsWarren T. Brussee, William G. Ferris
Estimating the term…
An improved pressed glass lens member for a sealed beam lamp unit is provided to include an outer sealing rim of varying thickness to compensate for thermal contraction of the lens member when molded in a predetermined manner. Specifically, the ordinary warped condition encountered with thermal contraction of the pressed glass article when initially formed is compensated for so as to permit subsequent heat sealing with a pressed glass reflector member by thermally fusing the glass material of both members in the sealing regions and without encountering the manufacturing defects now being experienced. The preferred embodiments illustrate such controlled thickness variation of the body section in the outer sealing rim region of a pressed glass lens member for both circular-shaped and rectangular-shaped lens configurations. Additionally, the rectangular-shaped pressed glass lens member embodiment illustrated can further include a molded projection provided on the back sealing surface of the rim region to further reduce unwanted deformation which otherwise occurs when the lens member is initially formed by pressing in glass molds.
A pressed glass lens member for a sealed beam lamp unit which include an inner surface having prism elements to focus light transmitted therethrough including longitudinally extending ribs and an outer sealing rim having front and back sealing surfaces joined by a body section wherein the improvement comprises varying the thickness of said body section so that the thickness of said rim body section is greater in the direction of said longitudinally extending ribs for a circular shaped lens member while the thickness of said rim body section is greater in a direction transverse to the direction of said longitudinally extending ribs for a rectangular shaped lens member.
A pressed glass sealed beam lamp unit which includes a lens member with an inner surface having prism elements including longitudinally extending ribs to focus light transmission therethrough and an outer sealing rim having front and back sealing surfaces joined by a body section of varying thickness that has been hermetically sealed to an outer sealing rim of a pressed glass reflector member, so that the thickness of said rim body section is greater in the direction of said longitudinally extending ribs for a circular shaped lens member while the thickness of said rim body section is greater in a direction transverse to the direction of said longitudinally extending ribs for a rectangular shaped lens member.
Dependencies are inferred from the claim text.