US539150A - William h - Google Patents

Description

(No Model.)

ELECTRIC LAMP.

n En'.

UNITED STATES PATENT QEETCE- lWILLlAM-H. SHEPPARD, OF NEW YORK, N. Y.

'ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 539,150, dated May 14,1895.

4 i Application tiled November 20, 1894. Serial No. 529,396. v(No model.)

To all whom `it may concern.-

. Be it known that I, WILLIAM H. SHEPPARD,

ot' New York city, New York, have invented an Improved Electric Lamp, of which the fol- 5 lowing is a specification.

This invention relates to an improved incandescent lamp which is more particularlyadapted to be used as a desk lamp and may be readily set t-o shed the light in different rc directions.

In the accompanying drawings, Figure 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. 4, a

l5 section on line44, Fig. l; Fig. 5, a longitudinal section through 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-barrel e laid out 2O 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, projects the hollow trunnions u?,

2.5 adapted to receive the swinging bracket arms b, b', which are revoluble within the trunnions and are h eld atl any desired inclination by the clamps 0.4. in the sockets b2, b3, provided with ornamental heads m, and adapted to receive the trunv nions c', c2, that project laterally from the lheads c3, of a cylindrical shade or' drum c. The-J shade is provided with an opening c4,

adapted to be closed'to any desired extent by 3 5 a slide or reilecting shutter d, which is free to be revolved within the drum c, by a handle The play of the shutter is limited by stops c5, that are engaged by the hooked end d2, of ,the shutter when the same is fully 4o closed.

To the trunnion c', is secured the socket of an incandescent lamp B, that projects axially through the drum c. This light serves more particularly to illuminate the desk, While the ,4 5 u pperlight A, serves for general illumination.

By the construction described, the desk light admits of three adjustments, viz: it may be revolved withlits arm b, b', to change its position; the drum c, may be revolved to alter The arms b, b', terminate` the position of the light opening, and the 5o 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 nipple a', while the conducting wires that 55 carry the electricity to thelower lamp B, pass through the hollow bracket arm b', and through a slot c6, of the hollow trunnion c', (Fig. 4.) Y

The arrangement of the key and wires is 6o such that with but a single key, the current 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 is provided with a tension 65 spring fn, and with three contact plates e2, e3, e4 (Fig. 7) arranged parallel to each other and connected by cross contacts e5, e6. The plate e2, extends completely around the drum, while the plates e3, e4, extend only partially around 7o the same and are placed back of one another.

f2, f3, f4, are the brushes, adapted to engage respectively the plates e2, e3, e4. The brush f2, connects with the first line wire g. The brush f3, connects with conducting wire g', of 75 the lower lamp B, the second wire g2, of which connects with post f5, and constitutes the second line wire. The brush f4, connects with conductilngwire g3, of upper lamp A, the second wire g4, of which goes to the wire g2. 8o

1f the key is in the position shownin Fig. 7, the current is cut off from both lamps. It the key is revolved a quarter turn, so that the brushes make the contact 00, Fig. 7, the current will pass to the lower light only, through 8 5 wire g, brush f2, contacts e2, e5, e3, brush f3, wire g',4 and back through wire g2. 'If the key is revolved a further quarterturn, so that the brushes make the contact y, y, the current will pass to both lights through wire g, brush 9o f2, contacts c2, e5, e3. Here the current is divided, part going through brush f3, Wire g', to` the lower light B, and part going through contacts e, e4, brush f4, wire g3, to upper light A, and out through wires g4, g2. If thekey is 95 revolved 'a further quarter turn, so that the brushes make the contact z', a', the current will pass to the upper light A only, through wire g, brush f2, contacts e2, e5, e3, e, e4, brush flgfwzire g3, to the light, and back through Wires Q Q i 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 adjustment, to suit the convenience of the occupant.

What I claim is- 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 Wires being led through one of the brackets, substantially as specified.

WILLIAM H. SHEPPARD.

Witnesses:

F. V. BRIESEN, WILLIAM SCHULZ.

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