Year: 1894

page_text: Date of Application, 10th Nov., 1894-Accepted, 26th Jan.,
1895
Fig. 2 is a vertical section thereof;
Fig. 3 is a view of the feeding devices of the lamp detached from the projector,
and from the lamp inclosing box, looking up from beneath the lamp when arranged
as in Fig. 2;
Fig. 4 is a view of the same at right angles to Fig. 3;
Figs. 5 and 6 illustrate a modified construction which will be described;
Fig. 7 is a side view of the lamp looking from the right of Fig. 4; and'
Fig. 8 is a section on lines x, x, of Fig. 3.
The supporting base 1, the body 2 of the search light projector, and the
means 3 for adjusting the body vertically and horizontally, at will, to direct the
light to any desired point, may be of any well-known or suitable construction.
On one side of the body of the projector, preferably the upper side, as shown
in Figs. 1 and 2, I form an extension 4, of suitable size and shape to receive and
support the lamp. 5, 6, are channel irons, or other suitable supports for the lamp,
fixed upon the sides of the extension 4, but insulated therefrom by mica, fibre, or
other insulation 7. The wire leading to the lamp will be connected to one of said
supports, and the wire leading from the lamp will be connected to the other, as
indicated by the dotted lines 8, 9, in Fig. 2. 10, 11, are Tirons secured to, but
insulated from, the box 12, and adapted to be supported by and to move on said
supports. The parts 10, 11, are connected by wires 13, 14, to the lamp within the
box. Thus good connection is made between the exterior circuit and the lamp.
The box 12 can be adjusted backward and forward in any convenient manner to
focus the light..
15 is a metal or
Referring now to Figs. 3 and 4, the lamp will be described.
other plate adapted to fit into box 12, and to which the lamp mechanism is secured!
16, 17, is a shaft supported in suitable bearings, adapted to turn, but fixed against
longitudinal movement, the parts 16, 17, being oppositely screw threaded, and each
part having a nut 18, 19, adapted to travel toward and from each other on the'
screw shaft and sliding on pins 20. At the centre of the screw shaft is a'friction'
clutch 21, consisting of one member 22, fixed to, the screw shaft, and 'one member

page_text: loose on said shaft. These clutch members are made in any well-known or suitable
manner such that when the loose member is moved in one direction the fixed
member is engaged and moved forward at the same time, thereby turning the
screw shaft. The construction of the clutch members is not shown in detail, since
such clutches are well-known. In some cases, a pawl and ratchet propelling device
for the screw shaft may be used instead of a friction clutch.
24, 25, are brackets, insulated from the plate 15 at 26, each supporting a carbon
carrying or feeding arm, 27, 28, by means of sleeves 29, 30, on suitable pivot
pins 30. The arm 27 is preferably in one piece with its sleeve, but arm 28 is
connected to its sleeve by a hinge or joint 31, so made that the arm is rigid in the
direction in which it moves in feeding the carbon but can be turned backward
slightly. This may be accomplished by pivoting arm 28 to lugs projecting from
the sleeve 30, as shown in Figs. 3, 4, 7 and 8, and providing the arm with a toe 31',
which when it rests against the sleeve, as shown in Fig. 8, prevents further forward
movement of the arm, independent of movement of sleeve 30, but which does not
prevent said reverse movement. The arms 27, 28, are bent to bring their lower
ends into line with each other, as shown in Fig. 1, and each arm carries a carbon 32,
shown as forming arcs of a circle, the centre of which is in the pivot line of said
arms. The carbons meet at or near the focus of the reflector. Current may be
taken to the carbons through the arms or through wires extending down to the
carbons.
33 is a series magnet or coil of the lamp and is supported by a bracket 34,
secured to sleeve 30, preferably by lugs through which the screws pass into the
sleeves, see Figs. 3, 7 and 8, so as to be capable of moving bodily with said sleeve
and in its arm 28. 35 is an armature provided with a pivoted lever 36 with a
retracting spring 37 and a limiting screw 38. On the end of the said lever
opposite the armature is a pin 39, with or without an anti-friction roller, extending
into slot 40 in arm 28. One terminal of this magnet may be connected by a
jointed arm 41 or by a flexible conductor to the insulated bracket 42, which in
turn will be connected to the T iron 10. The other terminal is connected to the
bracket 34, sleeve 30, to one carbon, thence to the other carbon, to sleeve 29, and
to Tiron 11, thus completing the series circuit.
44 is
43 is a shunt magnet or coil of the lamp, suitably secured to the plate 15.
the armature thereof, pivoted at 45, and having a retracting spring 46. From the
armature extends an arm 47 into a slot in the end of another arm 48, which is
adapted when moved in one direction to advance the loose member of the clutch,
and at the same time to advance the fixed member and the screw shaft, but when
moved in the opposite direction to move independently of the screw shaft as well
understood by those familiar with this class of devices. 49 is an adjustable arm
bearing against the clutch to prevent backward movement.
Carried by the armature and insulated from it, is an arm 50 adapted to play
between and against the adjustable stops 51, 52, on the screw or rod 53, connected
to the spring pressed plunger 54, insulated from plate 15, and making end contact
with a screw 56, carried by an insulated bracket 57. The terminals of the shunt
coil are connected, respectively, to the parts 55 and 14, see Fig. 3, and said parts
will be connected to the T irons, as before stated, to complete the shunt branch
through the lamp.
When the circuit is first closed to the lamp the series coil,-if the carbons be
together-draws in its armature, turning lever 36 on its pivot, thereby through
pin 39 in groove 40, moving arm 28 back, by turning it slightly on its hinge 31,
and striking or springing the arc. This throws more current through the shunt
coil, attracting its armature, tilting arı 48, thereby moving the loose member of
the clutch 21, and at the same time carrying arm 50 against stop 51, moving it and
screw 53 toward the left, see Fig. 4, separating said screw from screw 56, opening
the shunt circuit, allowing the armature to fall, and said screws to resume contact,
again closing the circuit, and when the carbons have been consumed so as to need
advancing, attracting the armature 44, and so on as long as the lamp is kept in

page_text: circuit and the carbons last. The parts 43, 44, 50, 53 and 56 form an automatic
vibrator in the shunt circuit of the lamp, which, by means of the clutch referred
to, turns screw shaft 16, 17, moving nuts 18, 19, toward each other, and carrying
the carbons also toward each other to maintain the arc. This movement will be
repeated as often as the resistance of the arc diverts enough current to the shunt
to cause the shunt magnet to attract its armature. If the carbons are not together
when the lamp circuit is first closed the vibrator will first act to bring the carbons
When
together and then the series coil will separate them as above described.
the carbons are consumed and new ones are to be inserted the clutch and screw can
be turned backward by the hand applied to the clutch where it extends through the
bottom of the box 12, as shown in Fig. 2. The clutch, screw shaft and nuts
engaging the pivoted arms, and constituting the feeding devices or mechanism for
the carbons, give a very delicate and steady movement to the carbons. The
carbons are so held that jarring such as they are frequently subject to on board
ship or elsewhere cannot cause them to fall together accidentally. The parts of the
lamp which extend in front of the reflector are small and of such form as not to
cut off such light. Magnet 33 being mounted as described maintains a fixed
position relative to arm 28 and sleeve 30, and it is always in position to move said
arm for the purpose above indicated.
Instead of using curved carbons and moving them in arcs straight carbons may
The movements
be used, and may be moved in straight lines, as shown in Fig. 5.
of arms 27, 28', can be controlled as already described. The outer ends thereof
have slots 60 in which play pins 61 projecting from the carbon holding clamps 62,
carrying straight carbons 321¹. As the arms or carriers 27', 28', approach each
other the carbons will be forced forward in straight lines, being guided by
sleeves 63.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In an arc lamp, the combination of pivoted arms carrying or adapted to carry
carbons, a screw threaded shaft, nuts moved thereby, and operatively connected
respectively to said arms so as to move them oppositely to feed the carbons, a
shunt coil and means operated thereby for turning the screw shaft to move the
arms and carbons toward each other.
2. In an arc lamp, the combination of pivoted arms carrying or adapted to carry
carbons, a screw threaded shaft, nuts moved thereby and operatively connected
respectively to said arms so as to move them oppositely to feed the carbons, a
shunt coil, means operated thereby for turning the screw shaft to move the arms
and carbons toward each other, a series coil and an armature therefor operatively
connected to one of said arms and adapted to move it to strike an arc.
3. In an arc lamp, the combination of pivoted arms carrying or adapted to carry
carbons, a screw threaded shaft, nuts moved thereby, and operatively connected
respectively to said arms so as to move them oppositely to feed the carbons, a
shunt coil, armature, and circuit breaker, and a clutch connected to the screw shaft
to transmit movement thereto, and operated by said magnet and armature.
4. In an arc lamp, the combination of pivoted carbon carrying arms provided
with grooves, a screw threaded shaft with oppositely threaded sections, nuts thereon
carrying pins extending into said grooves for moving the arms and means for
moving said screw.
5. In an arc lamp, the combination of pivoted carbon carrying arms, oue of
which is jointed, a series coil supported by said jointed arm on the pivot side of the
joint, an armature for the magnet engaging the jointed arm on the opposite side
of the joint from the pivot of the arm and means for moving the arms toward
each other.
6. The combination of carbon carrying arms 27, 28, screw 16, 17, clutch 21,

page_text: nuts 18, 19, pins 20 to guide the nuts, pins 59 carried by the nuts and engaging
said arms, and means including suitable coils for moving the same.
7. The combination of pivoted carbon feeding arms or carriers, carrying or
adapted to carry, straight carbons, a screw and means for turning it for moving
the said arms and carbons toward each other in straight lines.
8. The combination with a search light or projector body of conductors 5, 6,
supported thereby but insulated therefrom, and forming circuit terminals, a lamp,
an inclosing box or case therefor, conductors 10, 11, suitably insulated from each
other and adapted, respectively, to rest on conductors 5, 6, to complete the circuit
and to support the lamp, and connected to the lamp in the box.
9. The combination with a search light or projector body, of an arc lamp having
pivoted carbon carrying arms exteuding into said body in front of the reflector,
and means for moving said arms to maintain the arc.
10. The combination with a search light or projector body; of an extension, 4,
therein, an arc lamp in said extension and having pivoted carbon carrying arms
extending into said body in front of the reflector, and means for moving said arms
to maintain an arc.
Dated this 10th day of November 1894.
CHARLES AUBREY DAY,
321, High Holborn, London, W.C., Agent for the Applicant.