| 摘要 |
A portable lamp, such as a flashlight or small reading lamp, has a smooth rotatable light bulb portion that rotates evenly from a closed to an open position. The lamp includes a barrel-shaped illuminator within a main housing. The lamp housing is rotatable between a closed lamp-off position and a full-open lamp-on position in a smooth, slow motion movement from the closed to the open, lamp illuminating position. A torsion coil spring urges the lamp housing to rotate into the full-open position. The torsion coil is mounted in a hollow interior of a drum mounted rotatably within a diameter-matching cylinder, which has an inner surface. The drum has a corresponding outer surface in close proximity to the inner surface of the cylinder. The outer surface of the drum has a damper, such as a coating of friction-producing grease, which provides a fluid shear counter force to slow the rotational motion of the lamp housing. The torsion coil spring is prestressed and torqued so as to bias and urge the lamp housing to assume the open position, to expose the light source, such as the light bulb, therefrom. The portable lamp is attachable to a fixed object, such as a book, for convenient illumination of a desired location by an attachment means, such as a clip.
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