Illumination – Supports – Adjustable light support
Patent
1991-08-22
1993-02-16
Lazarus, Ira S.
Illumination
Supports
Adjustable light support
362 66, 362427, 362430, F21M 300
Patent
active
051865343
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to light fittings, and is concerned in particular with a light fitting having a support arrangement enabling the direction of the light beam emitted by the fitting to be adjusted.
Various support arrangements have been proposed in the past in which a lamp housing enclosing the bulb holder can be rotated independently about a first axis perpendicular to a central axis of the housing, and about a second axis inclined at 45.degree. to the first and central axes. This geometrical arrangement allows the beam axis, which is along the central axis, to be adjusted to project in any direction to one side of a plane perpendicular to the first axis. Such light fittings are described for example in our earlier patent specifications GB1581928 and GB1474186. Another know fitting is disclosed in specification FR2286343 and comprises a housing journalled on a support stem for rotation about an axis at 45.degree. to the respective axes of the stem and housing. The stem is equipped with a radially projecting handle for rotating the stem, but to rotate the housing about the 45.degree. axis it must be grasped in the hand, which is a disadvantage because it will get hot due to the heat from the bulb. A further disadvantage is that continuous rotation about the 45 .degree. axis is prevented by a stop, provided to prevent the electric wires becoming twisted, which can be electrically dangerous when adjusting the beam direction.
SUMMARY OF THE INVENTION
In accordance with the present invention there is provided an electric light fitting comprising a lamp housing enclosing a bulb holder and having a central axis, projection means extending from the housing along a pivot axis inclined to said central axis, support means having a rotation axis inclined to said pivot axis, the support means carrying mounting means thereon, said projection means being coupled to the mounting means for rotation relative thereto about the pivot axis, and said projection means extending beyond the mounting means to provide a handle for turning the housing about the pivot axis and for turning the housing and support means about the support rotation axis. With a light fitting embodying the invention a single handle located at a relatively remote position from the bulb holder provides especially simple and convenient adjustment of the housing and hence beam direction about the two adjustment axes, whereby such adjustment operations are greatly facilitated. The pivot axis preferably lies at 45.degree. to the central and support axes, in which case the central axis can be adjusted through 90.degree. from a position parallel to the support axis to a position perpendicular to the support axis by rotating the handle. If other ranges of adjustment are required different angles of inclination may be selected.
In a preferred construction the mounting means is tubular and the projecting means passes therethrough. In addition the support means comprises a contact adapted to rest against a contact located within the projection means and having an annular surface extending around the pivot axis. This arrangement allows the housing to be made continuously rotatable about the pivot axis because wires which would become twisted can be obviated.
BRIEF DESCRIPTION OF THE INVENTION
To assist a better understanding of the invention an exemplary embodiment will now be described in more detail with reference being made to the accompanying drawings in which:
FIG. 1 is a schematic cross-sectional view of a light fitting embodying the invention; and
FIG. 2 is a more-detailed scrap section showing the connection between the lamp housing and support stem.
DETAILED DESCRIPTION OF THE INVENTION
The light fitting illustrated in the drawing comprises a lamp housing 1 having a cylindrical forward end portion and a conical rear end portion with an apex angle of 90.degree.. Mounted in the housing is a bulb holder 2 positioned to support a low voltage bulb 3 on the central axis of the housing for the fitting to project a beam of l
REFERENCES:
patent: 3761890 (1973-09-01), Fritts et al.
patent: 4115841 (1978-09-01), Alexander
patent: 4259660 (1981-03-01), Oliver
patent: 4516190 (1985-05-01), Kloots
patent: 5034860 (1991-07-01), Bryant et al.
GTE Rotaflex Limited
Lazarus Ira S.
Quach Y.
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