Year: 1895

page_text: Date of Application, 14th May. 1895-Accepted, 6th July, 1395
described and ascertained in and by the following statement
This invention relates to an improvement in electric lamps which is more
particularly adapted to be used as a desk lamp and may be readily set to shed the
light in different directions.
In the accompanying drawing
Fig 1 is an elevation, partly in section of my improved lamp.
Fig. 2 is a section on line 2, 2. Fig. 1.
Fig. 3 a section on line 3, 3, Fig. 1
Fig 4a section on line 4, 4, Fig. 1.
Fig. 5 a longitudinal section thiougu one end of the drum c
Fig 6 a similar section through the other end of such drum, and,
Fig. 7 a diagram of the circuits, showing the key barel el, laid out into a plane.
The letter a, represents the socket of an incandescent lamp A, adapted to be
secured to a suitable support by nipple a'. From the socket a, project the hollow
slitted trunnions a, adapted to receive the swinging bracket arms b, b', which
are evoluble within the trunnions and are held at any desired inclination by the
clamps a'.
The arms b, b', terminate in the sockets &,, provided with ornamental heads m,
and adapted to receive the trunnions c', c³, that project laterally from the hoads c³,
of a cylindrical shade or drum c. The shade is provided with an opening ',
adapted to be closed to any desued extent by a slide oi reflecting shutter d, which
is free to be revolved within the drum c, by a handle d'. The play of the shutter
limited by stops c, that are engaged by the booked end, of the shutter when
the same is fully closed.
To the trunnion c¹, 18 secured the socket of an incandescent lamp B, that
projects axially through the drum c. This light sei ves more particularly to
illuminate the desk, while the upper light A serves for general illumination
By the construction described, the desk light admits of three adjustments, viz..
it may be resolved with its arms b, b, to change its position, the drum o, may be
evolved to alter the position of the light opening and the shutter d, may be drawn
out more or less, to adjust the size of such opening.
The line wires that conduct the current to both lamps A, B, enter the socket a,
through mpple a', while the conducting wines that carry the electricity to the lower
lamp B, pass through the hollow bracket arm b', and though a slit c, of the hollow
trunnion c', (Fig. 4).
The annugemont of the key and wires is such that with but a single key, the
curient can be sent into either one of the lamps, or jointly into both lamps.
To this effect the socket a, contains the revoluble key e, the drum e', of which 18
provided with a tension spring n, and with three contact plates e³, e³, e', (Fig. 7)
arranged parallel to each other and connected by cross contacts e, e. The plate e,
extends completely around the drum, wlule the plates ³, e, extend only partially
around the same and are placed back of one another.
Tff, are the brushes, adapted to engage respectively the plates e, es, et. The
brush, connects with the first line wire g.
The brush, connects with

page_text: conducting wire g', of the lower lamp B, the second wire q², of which connects
with post, and constitutes the second line wire The brush f*, connects
with conducting we g', of upper lamp A, the second wire 9, of which goes to
the wire g
If the key is in the position shown in Fig. 7. the current 18 cut off from both
Inmps. If the key is revolved a quarter tuin, so that the brushes make the
contact,, Fig 7, the ement will pass to the lower light only, through wire g,
brush, contacts e, e, e, brush f³, wue gl, and back through wire q³
If the key is evolved a further quaiter turn, so that the brushes make the
contact yy, the current will pass to both lights through wire brush f',
contacts e,,e Here the current is divided, part going through brush, wire g', to
the lower light B, and part going through contacts e, e, brush f', wire g³,
to upper
light A, and out through wires 9', g³
If the key is evolved a further quarter turn, so that the brushes make the
contact, the current will pass to the upper light A, only, through wire g
brush, contacts e³, e³, e³, eª, e¹, brush f, wire g', to the light, and back through
wires g*, g².
My improved lamp will be found to be very serviceable in offices and counting
rooms, as it sheds an agreeable light upon the desk, and permits its ready adjustinent,
to suit the convenience of the occupant.
Having now particularly descubed and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
1 An incandescent light socket having bracket arms secured thereto, which
bracket arms may or may not swing and have secured at their lower end a shade
and support for an electric lamp, the wines being led through one of the brackets,
substantially as specified.
2. The improved electric lamp substantially as herein shown and described.
Dated the with day of M... 100%