Improvements in Holophotes.
Year: 1891

page_text: Date of Application, 25th Apr., 1891
Complete Specification Left, 19th Jan., 1892-Accepted, 20th Feb., 1892
PROVISIONAL SPECIFICATION.
Improvements in Holophotes.
We, GEORGE SYLVESTER GRIMSTON, of Claremont, Glenluce Road, West-
combe Park, Kent, and ERNEST WILSON, of 2 Rose Mount, Church Lane, Old
Charlton, Kent, Electrical Engineers, do 'hereby declare the nature of this
invention to be as follows: --
Our invention relates to an improved, construction of holophotes in which the
body of the instrument which contains the lamp and reflector is moved by means
of electric currents from a distance, both in a horizontal plane, and in a vertical
plane, each such movement being effected by a separate electro motor, such motors
being either worked independently of each other, or together. For this purpose
the holophote body, which is of usual construction, is mounted upon a turntable
rotatable on a fixed hollow pedestal frame.
To the centre of the underside of the turntable is fixed a horizontal spur wheel,
with which gears a pinion on a vertical spindle, the lower end of which carries a
worm wheel. In gear with this worm wheel is a worm on the armature spindle of
the first or "turning" electro motor, which may be of any suitable construction
fixed on the bottom of the pedestal frame, so that, on the armature being driven
by an electric current from a distance, it will effect the rotation of the turntable
and with it the holophote body in a horizontal plane through the worm, worm
wheel, spindle, pinion and spur wheel.
From the underside of the spur wheel fixed to the turntable is suspended the
second or "tilting" electro motor in such a position that its armature axis passes
up vertically through the hollow axis of the spur wheel and turntable.
Above the latter the armature spindle carries a worm which gears with a worm
wheel on a horizontal spindle carried by the turntable, and this spindle carries a
pinion gearing with a spur wheel on a spindle carried by one of the uprights on
which are mounted the horizontal trunnions of the holophote body.
To the latter is fixed a segmental toothed rack with which gears a pinion on the
spindle of the above mentioned spur wheel.
From this arrangement it will be seen that when the armature spindle of the
tilting motor is driven by the electric current from a distance, it will effect the
turning of the holophote body in a vertical plane through the worm, worm wheel,
toothed gear, and segmental rack.
The circuits of the two electro motors are provided with suitable switches at the
operating station, for rendering the one or the other motor operative at will.
As the tilting motor has to revolve with the spur wheel and turntable from which
it is suspended, its framing is provided with annular contact surfaces connected
with the windings of the field. magnets, and upon which bear contact springs
carried by the pedestal frame, that are connected to the circuit wires, thus main-
taining the circuit of the field maguets closed in whatever position the motor
may be turned into.
The turntable carries a spindle with pinion that can be turned by a hand wheel
and which is in gear with a circular rack on the pedestal frame, so that the holo-
phote body can be moved by hand when required. A similar hand adjustinent
can also be provided on the horizontal trunnions of the holophote body.
Dated this 25th day of April 1891
ABEL & IMRAY,
Agents for the Applicants:

page_text: COMPLETE SPECIFICATION.
Improvements in Holophotes.
We, GEORGE SYLVESTER GRIMSTON, of Claremont, Glenluce Road, West-
combe Park, Kent, and ERNEST WILSON, of 2 Rose Mount. Church Lane, Old
Charlton, Kent, Electrical Engineers, 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 :—
Our invention relates to an improved construction of holophotes in which the
body of the instrument which contains the lamp and reflector is moved by means
of electric currents from a distance, both in a horizontal plane and in a vertical
plane, each such movement being effected by a separate electro motor, such motors
being either worked independently of each other, or together. For this purpose,
the holophote body, which is of usual construction, is mounted and connected by
gearing to the two electromotors, as we shall describe referring to the accompanying
drawings, Figs. 1 and 2 of which are vertical sections, on planes at right angles
to one another, of the hollow pedestal with side and front elevations of the holo-
phote body.
On the top D of the pedestal L which is provided with a side doors, to give
access to the internal mechanism, is mounted a turn table B, having a sleeve g
which works in a bearing in D and has fixed to it a horizontal spur wheel 7.
With this wheel gears a pinion bon a vertical spindle 1 the lower end of which
carries a worm wheel y. In gear with this worm wheel is a worm w on the
armature spindle of the first or "turning "electro motor E, which may be of any
suitable construction fixed on the bottom of the pedestal frame, so that, on the
armature being driven by an electric current from à distance, it effects through the
gearing w, y b and 7 rotation of the turntable B and with it the holophote body A
in a horizontal plane.
a
66
To the underside of the spur wheel 7 is fixed the second or tilting " electro
motor F in such a position that its armature axis passes up vertically through the
sleeve of the spur wheel 7 and turntable B, above which it carries a worm g
which gears with a worm wheel 10 on a horizontal spindle 11 carried by the
turntable.
This spindle 11 has on it a pinion 12 gearing with a spur wheel 13 on a spindle 14
carried by one of the uprights C on which are mounted the horizontal trunnions T
of the holophote body A. To the body A is fixed a segmental toothed rack 16
with which gears a pinion 15 on the spindle 14.
By means of this gearing the armature spindle of the "tilting motor” F, when
it is driven by the electric current from a distance effects the movement of the
holophote body in a vertical plane on its trunnions T.
The circuits of the two electro motors are provided with suitable switches at the
operating station, for rendering the one or the other motor operative at will.
As the "tilting" motor F has to revolve with the spurwheel and turntable,
from which it is suspended, its framing is provided with pairs of annular contact
surfaces 19 connected with the windings of its field magnets and armature and on
these bear pairs of contact springs 20 which are carried by the pedestal frame,
and are connected to the circuit wires, thus maintaining the circuit of the field
magnets and armature always closed however the motor F may be turned round
on its vertical axis.
The turntable carries a spindle with pinion which can be turned by a hand
wheel U and which gears with a circular rack t on the pedestal frame, so that the
holophote body can be turned round by hand when required. A similar hand
movement may be also applied by means of the hand wheel P which is provided
with a disengaging clutch R, to the trunnions T so as to tilt the holophote body A
in the vertical plane.

page_text: As our invention relates only to the mechanism for moving the holophote in
the horizontal and vertical planes, we do not describe the construction of the
holophote body A nor its electric lamp, reflector or other parts, as these may be
of any known kind, to which we make no claim. Nor do we claim the motors E
and F which may also be of any suitable known kind but,
Having now particularly described and ascertained the nature of this inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
Mounting the arms which carry the trunnions of a holophote body on a turntable
moved round in the horizontal plane by gearing from one electromotor, and carrying
suspended from the turntable another electromotor by gearing from which the
holophote body is moved on its trunnions in the vertical plane substantially as
described.
ABEL & IMRAY,
Agents for the Applicants.