Year: 1886

page_text: Date of Application, 26th Oct., 1886.
Complete Left, 25th June, 1887.
Complete Accepted, 26th Aug., 1887.
[Communicated from abroad 'by The ELECTROTECHNISCHE FABRIK CANNSTATT, of
Cannstatt, through their Agents, Wirth and Company, of Frankfort on the Main,
both in the Empire of Germany.]
, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of this Invention to be as follows:-
This Invention has for its object an arrangement whereby a dynamo-machine is
rendered capable of giving off a current when revolving both in the forward and
backward direction. This is effected by the following arrangement reference being
had to the accompanying drawing in which figure 1 represents a longitudinal section
and figure 2, an end view of the machine-Two brushes B B press radially on the
collector or commutator A of the dynamo, both the brushes being carried by a box C
mounted either on the shaft of the dynamo or on a prolongation of the frame. The
brushes are, by their contact with the collector carried round together with the box C
in the direction in which the machine is running as far as a stop D or D¹ will allow
until the brushes are in the most favorable position. By thus revolving the box C the
direction of the current leaving the ring and conducted away by the contacts F F is
so altered by means of the semi-circular pieces E E and the contacts F F that it
always flows around the magnets in the same direction and the poles of the machine
remain unchanged.
r
Daind this 6th of Dana 1000
A. MELVILLE CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane, London,
Patent Agents.

page_text: COMPLETE SPECIFICATION.
An Improvement in Dynamo-electric Machines.
I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of this Invention (a communication to me from
abroad by The Electrotechnische Fabrik Cannstatt of Cannstatt, through their agents
Wirth and Company of Frankfort on the Main, both in the Empire of Germany) and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
This Invention has for its object an arrangement whereby a dynamo machine is
rendered capable of giving off a current when revolving either in the forward or
backward direction. This is effected by the following arrangement-reference being
had to the accompanying drawing in which figure 1 represents a longitudinal section
and figure 2 an end view of the machine. Two brushes B B press radially on the
collector or commutator A of the dynamo, both the brushes being carried by a sleeve C
mounted either on the shaft of the dynamo or on a prolongation of the frame. The
brushes are by their contact with the collector, carried round together with the sleeve C
in the direction in which the machine is running, as far as a stop D or D¹ will allow,
until the brushes are in the most favorable position. By thus revolving the sleeve C,
the direction of the current leaving the ring and conducted away by the contact
springs F F is so altered by means of the semi-circular contact segments E E and the
contact springs F F, that it always flows around the magnets in the same direction
and the poles of the machine remain unchanged.
Having now particularly described and ascertained the nature of the said invention,
and in what manner the same is to be performed, I declare that what I claim is ;-
The herein described means whereby the current may be taken from a dynaino-
machine in whichever direction it may be running, such means consisting of contact
brushes mounted upon sleeves C free to be rotated about the machine axis by the
frictional contact of the brushes on the commutator, the motion being limited by
stops D D so that the brushes will occupy the most favorable position and will at
same time be switched by the contact segments E connected to the sleeve, sliding
under the contact springs F, so that the poles of the machine remain unchanged,
substantially as set forth.
Dated the 25th day of June 1887
A. MELVILLE CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane, London,
Patent Agents.