Year: 1888

page_text: Date of Application, 23rd July, 1888
Complete Specification Left, 23rd Apr., 1889
Complete Specification Accepted, 25th May, 1889
We, WALTER RUssell Mortimer, of No. 11 Alexandra Square, South Kensington,
Electrician, and JAMES HOLLOWAY of No. 10 Milman Street, Bedford Row, Electrical
Engineer. do hereby declare the nature of this invention to be as follows:-
In the Provisional Specification filed by us on the 20th June 1888 No. 9032 we
described a construction of arc lamp wherein a solenoid had a tubular core through
which passed a carbon holder, the core being made to automatically grip or
release the carbon holder as it was moved up or down by the action of the
solenoid, such gripping or releasing being effected by means of a bell crank lever
pivotted to the core, one end of which was connected by a spring to the lamp
frame, while the other end had a block which, as the core moved upward, was
pressed against the carbon holder so as to grip it, by the action of the spring.
According to one of our present improvements, instead of connecting the lever to a
spring we apply an adjustable weight thereto, and we cause such weighted end of the
lever to rest upon an adjustable stop when the core is in the lowered position.
Also, instead of causing the other end of the lever simply to press against the
carbon holder so as to nip it, we attach to the lower end of the core a jointed or
flexible split ring passing round the carbon holder, and having its two ends connected
to or acted upon by the lever in such manner, that when the core is in the lowered
position the lever leaves the ring free so that it does not grip the carbon holder, but
when the core rises so as to raise the weighted end of the lever off its stop, this will
act upon the ring so as to tighten it round the carbon holder, and cause it to carry
this with the core.
up
By preference we effect this connection between the ring and the lever by forming
on the split ends of the former two projecting lugs with inclined sides, and we form
on the lever a fork with corresponding inclined inner surfaces, so that when the lever
approaches the ring, its fork presses the lugs of the ring together, and thus closes
the ring upon the carbon holder.
According to another modification we dispense with the weighted arm of the lever
and we either connect the arm with the fork directly to one end of a spring, the
other end of which is connected to the lamp frame, so that when the core rises the
spring draws the fork against the lugs of the ring as before described.

page_text: Or the fork is kept away from the ring by a spring, and as the core rises, the outer
face of the fork comes in contact with a stationary surface, which presses it against
the ring.
According to another arrangement we form two or more slots in the tubular core
and in these slots we provide bars pivotted at the lower end to the core, while their
upper ends pass through a ring suspended by a spring, the upper end of which is
attached to the lamp frame.
The said bars are formed with inclines on their outer surfaces, so that as the core
rises with the bars, the upper ends of these, in rising through the ring are pressed
inward by the latter so as to grip the carbon holder within the core.
Dated this 23rd day of July 1888.
ABEL & IMRAY,
Agents for the Applicants.

page_text: We, WALTER RUSSELL MORTIMER of No. 11 Alexandra Square, South Kensington,
Electrician, and JAMES HOLLOWAY of No. 10 Milman Street, Bedford Row, Electrical
Engineer, do hereby declare the nature of this invention and in what manner the.
same is to be performed is to be particularly described and ascertained in and by the
following statement :-
-
In the Specification to our application for Letters Patent dated 20th June 1888
No. 9032 we described a construction of arc lamp wherein a solenoid had a tubular
core through which passed a carbon holder, the core being made to automatically
grip or release the carbon holder as it was moved up or down by the action of the
solenoid, such gripping or releasing being effected by means of a bell-crank lever
pivotted to the core, one end of which was connected by a spring to the lamp frame,
while the other end had a block which, as the core moved upward, was pressed against
the carbon holder so as to grip it, by the action of the spring.
According to one of our present improvements, instead of connecting the lever to a
spring, we apply an adjustable weight thereto, and we cause such weighted end of the
lever to rest upon an adjustable stop when the core is in the lowered position. Also,
instead of causing the other end of the lever simply to press against the carbon
holder so as to nip it, we attach to the lower end of the core a jointed or flexible split
ring passing round the carbon holder, and having its two ends connected to or acted
upon by the lever in such manner, that when the core is in the lowered position the
lever leaves the ring free so that it does not grip the carbon holder, but when the core
rises so as to raise the weighted end of the lever off its stop, this will act the
upon
ring so as to tighten it round the carbon holder, and cause it to carry this up with the
core.
By preference we effect this connection between the ring and the lever by forming
on the split ends of the former two projecting lugs with inclined sides, and we form
on the lever a fork with corresponding inclined inner surfaces, so that when the
lever approaches the ring its fork presses the lugs of the ring together, and thus closes
the ring upon the carbon holder.
According to another modification we dispense with the weighted arm of the lever
and we either connect the arm with the fork directly to one end of a spring the other
end of which is connected to the lamp frame, so that when the core rises, the spring
draws the fork against the lugs of the ring as before described.
Or the fork is kept away from the ring by a spring, and as the core rises the outer
face of the fork comes in contact with a stationary surface, which presses it against
the ring.
Figs. 1 and 2 of the accompanying drawings shew respectively a vertical section
and an underside view of a tubular core with one arrangement of the herein described
improved clamping device for the upper carbon holder.

page_text: The core A has attached to its lower end a ring B which is formed of two parts
On the
hinged together at B¹ where they are connected by screw C to the core A.
opposite side each part has a projecting lug B' with inclined outer face and to the
core is pivotted at A₁ a lever C having a fork C¹ with inclined sides, embracing
the lugs B, and carrying at its outer end an adjustable weight D, so that this weight
in depressing the lever causes it to press together with its fork the lugs B' of the
ring, thereby causing the latter to nip the carbon holder E, so as to partake of the
motion of the core, as described in our said former specification.
In the plate F of the lamp casing is screwed a pin G immediately beneath the outer
end of the lever C, so that when by the descent of the core A consequent upon a
decrease of current in the solenoid H, the lever C is brought to rest upon the pin G,
the fork C¹ will be made to release the lugs of the ring B, and this, in releasing its
grip on the carbon holder, will allow the latter to descend in the core.
By adjusting the pin G in the plate F, and the weight D on the lever C, the
positions in which the core A grips and releases the carbon holder can be accurately
regulated.
The construction and action of the lamp is otherwise the same as set forth in our
said prior specification and need therefore not be further described.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. In combination with the tubular core and solenoid of an electric arc lamp, a
divided or split ring connected to the core and embracing the carbon holder which ring
has lugs with inclined faces on which act the inclined faces of a forked.lever also
carried by the tubular core substantially as and for the purposes herein described.
2. In combination with the tubular core, carbon holder and solenoid of an electric
arc lamp, a lever pivotted to the core and operating at its one end upon à clamping
device for holding the carbon holder in the core, while at its other end it carries an
adjustable weight, a fixed adjustable pin or support being so arranged relatively to
such weighted end of the lever that on the sinking of the core, the lever is supported
upon the pin, and is thereby made to loosen the clamping device so as to allow of the
descent of the carbon holder, substantially as herein described.
3. In an electric arc lamp the, combination with a tubular core A and lamp
solenoid H, of a divided or split ring B with lugs B2, lever C with fork C¹ and
weight D, and adjustable pin G, arranged and operating substantially as herein
described.
Dated this 23rd day of April 1889.
ABEL & IMRAY,
Agents for the Applicants.