Improved Method of and Appliances for Manipulating Search Light Projectors.
Year: 1894

page_text: Date of Application, 22nd Mar., 1894-Accepted 28th Apr., 1894
COME LEIE T
Improved Method of and Appliances for Manipulating Search Light
Projectors.
I, WILLIAM ELWORTHY, of Suez, Egypt, Electrical Engineer do hereby
declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement :-
My invention relates to an improved method of manipulating electric
search light projectors, and has for its object the elevation, depression and
turning of the projector from the bridge, or other suitable part of the vessel,
without requiring an attendant at the projector itself. Thus, in the navigation of
a ship canal by night by means of the electric light, the pilot may himself coutrol
the projector from the bridge, although it is situated upon the stem of the ship.
In carrying my invention into effect, I may employ electricity as a medium of
communication, or air, steam, water or other fluids or gases.
In order that my said invention may be clearly illustrated, I have appended the
accompanying two sheets of drawings, in which
Figure 1, Sheet 1, is a side elevation of a projector fitted with an electrical
device, Figure 2 is a front elevation of the same, and Figure 3 a plan view thereof,
with the barrel of the projector removed.
Figure 4 is an elevation of a switch board.
Figure 5 Sheet 2 is a diagram of the method of connecting one of the electro
motors with the bridge, and
Figures 6 and 7 shew an alternative device in which pneumatic force is
employed.
Figure 8 is a transverse section of a two way valve employed in cases where
pressure from external sources is employed, and Figure 9 is an elevation thereof.
In all cases, where practicable, like letters of reference have been used to denote
corresponding parts in the several views.
In practically carrying out my invention, I attach to one of the trunnions E
Figures 1, 2 and 3 of a projector barrel A, a quadrant D preferably toothed to
engage with an endless screw or worm F, which is fitted upon the spindle of an
electric motor G, fixed to a bracket H, forming part of, or attached to, the fork B.
Upon the opposite side of said fork B, another similar bracket H¹ carries another
motor J upon the spindle of which is a pinion K, gearing with a segmental rack I
firmly attached to the pedestal C, upon which the fork B, and the brackets H H'
are free to turn. It is therefore evident that according to the revolution of the
spindle of the motor G in either direction, the barrel of the projector A is elevated
or depressed, and in a similar manner said barrel may be turned to either side by
the revolution of K upon the spindle of the motor J, since K gears with the fixed
segmental rack. Therefore if the motors G and K can be controlled from a
distance, and the projector is furnished with an automatically fed focussing electric
lamp, an attendant may be dispensed with.
There are two methods of reversing electro motors, viz., by altering the position
of the brushes upon the commutators, or by reversing the direction of the current
round the field magnet and armature coils. Or, in the case of a shunt wound
motor, a simple reversal through the brushes effects the desired object. As the
first method is not practicable, the second, according to the diagram, Figure 5,
Sheet 2, is most suitable. A wire k leads from one end of the coils of the field
:
1

page_text: magnet of the motor to a plug or the like e on the switch board. The other end
of the field magnet coils is connected to another plug b by a wire l. One brush j
is connected to plugs a and d, and the other brush i to plugs cand f. The
plugs and are the two terminals of the leads carrying the driving current.
In order that the electromotor shall revolve in one direction, g must be coupled
to c and h toe and a and b are connected, or coupled together. In order to
reverse the motor, 9 must be coupled to b, and h to daude and coupled
together. This may be effected by means of a parallel multiple barred switch, as
shewn by L and M upon the board Figure 4, Sheet 1, or by a number of switches,
or by pegs.
In the case of a shunt wound motor, the only wires to be carried
would be from i and j to a and f, and reversal would be effected, by coupling g to a
and h to for h to a and g to f. The eight leads, being four for each motor
may be carried from the projector to the switches or the like cased in one
envelope or covering. In the case of using a switch-board similar to that shewn
by Figure 4, the switch L will control the motor J, and M the other motor G,
upon the projector.
An alternative arrangement is shewn by Figures 6 and 7, in which the lever D
may be substituted for the quadrant D, Figures 1, 2, and 3, or the segmental
rack I. Said lever D is jointed to a rod s upon which is fixed a piston t
working freely within a cylinder N, which has two ports u u¹, connected
to two tubes 2' vl which are carried to the regulator shewn by Figure 7.
This consists of two bellows, or collapsible chambers P P, to each
of which the pipes vv are connected a lever O, pivotted at
w enables
either P or P₁ to be inflated or deflated by means of the handle. If P1 be
deflated, as shown, the piston t is moved forward, the exhaust passing along v
and inflating P. A reversal of this process causes D to be moved in an
opposite direction, and if two sets of apparatus be substituted for the electro
motors G and J, herein before mentioned, both movements of the projector may
be similarly effected from the bridge or other distant point. Instead of using an
air circuit, I may utilise a constant pressure of air, steam, water or the like from
any source, in which case I employ a valve as shewn by Figures 8 and 9 Sheet 2,
in combination with the cylinder N, Figure 6. The pressure inlet r communicates
with the hollow plug o working within a bush n, fitting within the chambered
casing m in which two tubes p and p² are provided for connecting to the tubes vo
Figure 6. The plug is furnished with two ports, only one of which can be fully
open at the same time. In the position shewn, the pressure within o would act
through p while p' is closed. Thus the piston t may be made to travel in either
direction, but the exhaust does not in this case return as when the regulator shown
by Figure 7 is used. To provide for this, and also to prevent a too sudden
movement of D, a small hole is bored in the cylinder, or covers, on each side of
the piston, thus allowing the exhaust to escape slowly upon the exhaust side, while
that upon the pressure side allows of a certain leakage, but not to an extent to
prevent the required movement or to cause an appreciable waste.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is ;-
First. The combination of an electric light projector with one or two electric
motors, connected with a distant switchboard, and gearing therefor, substantially
as and for the purposes herein set forth, with reference to the appended drawings.
Second. The combination of an electric light projector with one
cylinders, having a piston or pistons attached to a lever or levers, substantially as
and for the purposes herein set forth, with reference to the appended drawings.
or more
Third. The combination of an electric light projector with one or more
cylinders as referred to in the preceding claim, with an air circuit and regulator
comprising the tubes vv, bellows P P and lever O substantially as herein
described with reference to Figures 6 and 7 of the appended drawings.

page_text: Fourth. The combination of a cylinder as referred to in the two preceding
claims with a two way cock, substantially as and for the purposes herein described,
with especial reference to Figures 6, 8 and 9, Sheet 2 of the appended drawings.
Dated this 27th day of February 1894.
FREDK. WALKER,
73, St. Stephen's Road, Upton Park, E., Agent for the Applicant.