Vibration resistant, energy efficient lamp
View Patent ↗A vibration resistant, energy efficient lamp ( 10 ) that is suitable for, for example, ceiling fan operation where vibration is always a concern. The lamp ( 10 ) comprises an envelope ( 12 ) of a suitable transparent glass, for example, a borosilicate glass, having a substantially spherical upper body ( 14 ) with a given diameter D, a substantially cylindrical waist ( 16 ) having a diameter W of about 38% of the given diameter; a neck portion ( 18 ) having a diameter N of about 31 to about 32% of the given diameter and a threaded base ( 20 ) having a diameter B of about 25 to 27% of the given diameter. The base ( 20 ) has a skirt portion ( 22 ) adjacent the neck portion having diameter S substantially equal to the neck portion ( 18 ) diameter N and larger than the diameter B of the base ( 20 ). The skirt ( 22 ) provides a broader attachment area for the neck ( 18 ), thus strengthening the coupling and providing a stronger joint that is more suited to operations in those functions where vibration can be encountered, especially in those areas where the lamp is mounted base-up.
1. A vibration resistant, energy efficient lamp comprising:
an envelope having a substantially spherical body with a given diameter D;
a substantially cylindrical waist having a diameter W of about 38% of said given diameter;
a neck portion having a diameter N of about 31 to about 32% of said given diameter;
and a threaded base having a diameter B of about 25 to 27% of said given diameter, said base having a skirt portion adjacent said neck portion having diameter S substantially equal to said neck portion diameter N and larger than said diameter B.
2. The lamp of claim 1 wherein said lamp contains an incandescent filament supported by at least three supports.
3. The lamp of claim 1 wherein said envelope is symmetrically arrayed about a longitudinal axis.
4. The lamp of claim 2 wherein said envelope is gas-filled.
5. The lamp of claim 3 wherein said longitudinal axis has a length 1 of about 172 to 180% of said given diameter.