Adjustable lighting apparatus

Claim 2

A dental operating light for projecting a light beam having a generally rectangular vertical cross-section, comprising an enclosure, an elongated rotatable member having a pair of longitudinally aligned spaced-apart elongated openings, the upper side of each of which defines a straight line, and adapted for rotational movement with respect to said enclosure about an axis of rotation, a pair of light units each of which is capable of projecting a light beam having a generally rectangular vertical crosssection, the width of said beams being greater than the height of said beams, attaching means for attaching each of said light units to said rotatable member adjacent one of said elongated openings for projecting therethrough a pair of light beams, each having said generally rectangular vertical cross-section, said light units being positioned to cause said light beams to centrally overlap to form a single composite light beam having a generally rectangular vertical cross-section, with a central portion thereof being of a brighter intensity than the end portions thereof, a reversible electric motor mounted within said enclosure, a gearbox directly coupling said motor and said elongated rotatable member for rotating said rotatable member about said axis of rotation when said motor is energized and sweeping said composite light beam in an arc to a selected position, switch means for reversibly energizing said motor, and means adapted for instantaneously braking said motor upon deenergization thereof for stopping the rotation of said elongated rotatable member and said composite light beam at a selected position.

Claim 3

The apparatus as described in claim 1, wherein said elongated openings have a generally rectangular configuration.

Claim 4

The apparatus as described in claim 1, wherein said elongated openings have the configuration of a chordal segment of a circle.

Claim 5

The apparatus as described in claim 1, wherein a portion of each of said light units is masked by a portion of said elongated rotatable member adjacent said elongated openings for shielding the filaments of said light units.

Claim 6

The apparatus as described in claim 1, wherein the upper straight line side of each of said elongated openings acts to sharpen and straighten the upper side of said projected rectangular light beams.

Claim 7

The apparatus as described in claim 1, wherein the axes of said projecting light beams are positioned in a substantially parallel relationship.

Claim 8

The apparatus as described in claim 1, including means for selectively varying the intensity of said plurality of light units.

Claim 9

A dental light for projecting a light beam having a rectangular vertical cross-section upon the mouth of a seated patient, comprising an enclosure, an elongated support member having a pair of longitudinally alIgned spaced-apart elongated openings, the upper side of each of which defines a straight line, said support member having a pair of extending arms, first and second shafts connected to respective ones of said pair of extending arms and mounted within said enclosure for allowing rotational movement of said support member about an axis of rotation, a pair of light sources each of which is capable of projecting a light beam having a generally rectangular vertical cross-section, the width of said beams being greater than the height of said beams, attachment means for attaching each of said light sources to said support member adjacent one of said pair of elongated openings respectively for projecting therethrough a pair of beams of light, each of said beams having a rectangular vertical cross-section and longitudinally overlapping to form a single composite light beam having a rectangular vertical cross-section, said composite light beam having a central portion of greater intensity than the end portions thereof, the axes of said pair of projecting light beams being in spaced substantially parallel relationship, a reversible motor mounted within said enclosure adjacent to said first shaft, speed reducing means interconnecting said motor and said first shaft for imparting rotational motion to said support member about said axis of rotation when said motor is energized and sweeping said elongated cross-sectional composite light beam through an arc about said axis to a selected position, brake means mounted on said motor for instantaneously stopping the rotational movement of said support member when said motor is de-energized, first switch means for selectively energizing said reversible motor, and second switch means for selectively varying the intensity of said pair of beamed-light sources.

Claim 10

A dental light for projecting a light beam having a rectangular vertical cross-section upon the mouth of a seated patient, comprising an enclosure, an elongated support member having a pair of longitudinally alIgned spaced-apart elongated openings, the upper side of each of which defines a straight line, said support member having a pair of extending arms, first and second shafts connected to respective ones of said pair of extending arms and mounted within said enclosure for allowing rotational movement of said support member about an axis of rotation, a pair of light sources each of which is capable of projecting a light beam having a generally rectangular vertical cross-section, the width of said beams being greater than the height of said beams, attachment means for attaching each of said light sources to said support member adjacent one of said pair of elongated openings respectively for projecting therethrough a pair of beams of light, each of said beams having a rectangular vertical cross-section and longitudinally overlapping to form a single composite light beam having a rectangular vertical cross-section, said composite light beam having a central portion of greater intensity than the end portions thereof, the axes of said pair of projecting light beams being in spaced substantially parallel relationship, a reversible motor mounted within said enclosure adjacent to said first shaft, speed reducing means interconnecting said motor and said first shaft for imparting rotational motion to said support member about said axis of rotation when said motor is energized and sweeping said elongated cross-sectional composite light beam through an arc about said axis to a selected position, brake means mounted on said motor for instantaneously stopping the rotational movement of said support member when said motor is de-energized, first switch means for selectively energizing said reversible motor, and second switch means for selectively varying the intensity of said pair of beamed-light sources.

Claim 11

The apparatus as described in claim 8, wherein a portion of each of said light units is masked by a portion of said elongated rotatable member adjacent said elongated openings for shielding the filaments of said light units.

Claim 12

The apparatus as described in claim 8, wherein the upper straight line side of each of said elongated openings acts to sharpen and straighten the upper side of said projected rectangular light beams.