Illumination – Light source and modifier – Adjustable or repositionable modifier
Patent
1996-12-06
1998-07-28
Cariaso, Alan
Illumination
Light source and modifier
Adjustable or repositionable modifier
362319, 362360, 362432, F21V 100
Patent
active
057854165
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a lamp with an adjustable shade for regulating the dispersion of a light beam. The lamp comprises a light source and a reflector mounted in a shade with an aperture and can be used as a work lamp, reading lamp, bedside lamp, standard lamp, wall lamp or in any other way in which until now, if a change is required in the light dispersion at one point at a certain distance, it has been necessary to either move the lamp or the object which has to be illuminated.
For people who sleep in a double bed or in separate beds with more than one bed in the same room, for example, a problem arises when one person wishes to read in bed while the other wants to sleep without being kept awake by light in the room. Tests on the lamp have shown that it is highly suitable for this purpose, as well as being easy to use. In to-day's market there are no lamps which solve this problem in a satisfactory manner.
BACKGROUND OF THE INVENTION
Attempts have been made previously to produce lamps in order to solve this problem, see DE-2509 270, SE-389 385 and GB-1146426. Compared with the present solution the lamp in DE-2509 270 appears to be considerably more cumbersome to adjust as well as being much more expensive to produce. SE-389 385 appears to present a solution with a substantially greater scope and seems more complicated and thereby more expensive to produce than the present lamp and furthermore it will have a higher power consumption and an extremely unattractive appearance in a focused position. In addition the brightness of this lamp will vary according to the position of the reflector in relation to the light source. The invention in GB-1146426 seems more complicated and more expensive to produce and unsuitable for most of the areas of application of the present solution.
SUMMARY OF THE INVENTION
The object of the present invention is to produce a lamp which, apart from being able to be used as an ordinary work lamp, reading lamp, bedside lamp, standard lamp, wall lamp, table lamp, etc. with normal light dispersion, also permits a point or a spot to be illuminated at a certain distance from the light source without the need to move the lamp or the object which has to be illuminated. The lamp is designed in such a manner that when it is in a focused position it gives very good spot lighting with little light dispersion. When used as bedside lighting, when the lamp is set in the focused position, the rest of the room is shielded from the light, thereby causing only a very slight degree of dazzle. Furthermore the lamp should be simple and inexpensive to produce. The object of the invention is achieved with a lamp which has the characteristic features which are indicated in the patent claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to the attached schematic drawings which illustrate one of many conceivable embodiments of the invention.
FIG. 1 is a longitudinal section of the lamp in focused position.
FIG. 2 is a longitudinal section of the lamp in the position for maximum dispersion of the light.
FIG. 3 is a longitudinal section of the external shade part.
FIG. 4 is a sectional illustration of the stepless adjustment of the slide block.
DETAILED DESCRIPTION OF THE INVENTION
On to any kind of fitting, in this case a wall fitting 1, as illustrated in FIGS. 1 and 2, there is mounted a tube 2, on to the front edge of which is mounted a connecting piece 3. This connecting piece 3 is further connected to a second tube 4, on to the front edge of which is mounted a light source holder 5 and a reflector 6. The shade 7 is cylindrical in shape with a slot 8 and in front of the slot a hole 9, and an internal cylindrical part 10, in the rear edge of which is an end wall 11 with a hole 12 through which the tube 4 is passed. The end wall 11 has an extended rear piece, a slide block 13, with a hole 14 for mounting a spring 15, one end of which is enclosed by a sliding plate 16 which is pressed against the second tube 4 and the
REFERENCES:
patent: 1166930 (1916-01-01), Petrie
patent: 1395490 (1921-11-01), Graff
patent: 1739144 (1929-12-01), Huntworth
patent: 2078028 (1937-04-01), Schneider
patent: 4190880 (1980-02-01), Esaki
patent: 4530039 (1985-07-01), Shin-Shi
patent: 5083253 (1992-01-01), Hahnel
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