Improved Combined Brake and Circuit Making and Breaking Device for use with Electric Motors.
Year: 1890

page_text: Date of Application, 7th June, 1890
Complete Specification Left, 4th Nov., 1890-Accepted. 6th Dec.. 1890
Improved Combined Brake and Circuit Making and Breaking
Device for use with Electric Motors.
I, ALBERT PIAT of 15 Rue des Halles, Paris, France, Engineer, do hereby declare
the nature of this invention to be as follows:-
My invention relates to an improved electro-mechanical apparatus designed to impart
motion to electro motors and the like, to arrest the said motion, and to change the
direction thereof as desired.
The improved apparatus comprises an operating lever adapted to be electrically
connected with the electro motor to be controlled, and provided with brake blocks
adapted to act against the flywheel of the said electro motor which latter is electrically
connected with a dynamo or other generator by means of electrical conductors attached
to terminals carried by fixed insulated contact pieces, and by means of electrical
conductors connected to contact fingers carried by the operating lever.
Assuming the operating lever to be in its middle position
Then in order to cause motion of the electro motor, it may be in a forward direction,
the said lever is moved until one of its contact fingers, it may be the one nearest the
centre of oscillation of the lever, comes in contact with a fixed insulated contact piece
carrying a terminal which receives the conductor coming from the generator.
At the same time the other contact finger or that furthest from the centre of
oscillation of the operating lever has come in contact with a fixed insulated contact
piece carrying a terminal electrically connected by a conductor with the dynamo or
other generator.
The motive current then passes by the first mentioned terminal through the first
mentioned fixed contact and the first mentioned contact finger, and through the
operating lever, the oscillatory shaft of which is mounted on an insulating plate, and
passes to the electro motor by a terminal attached to the first mentioned contact
The current
finger, producing the required rotary motion of the electro motor.
returns from the electro motor to the operating lever by a terminal attached to the
other contact finger whence it passes by means of the said contact finger and its
corresponding fixed contact by the terminal carried by the latter to the dynamo or
other generator.
In order to arrest the motion of the electro motor, the movement of the lever is
continued until the last mentioned contact finger passing under a pawl raises the latter,
which falls back under the action of a spring as soon as the contact finger has passed
beyond the pawl, the current being cut off by reason of the last mentioned contact
finger passing out of contact with the last mentioned fixed contact piece.
In this movement, breaking is produced with one of the brake shoes simultaneously
with the cutting off of the motive current, and the motion of the machine is thus
effectually arrested.
In returning the operating lever into its middle position without again setting the
electro motor in motion, the first mentioned contact finger passes again over its
corresponding fixed contact piece but after the other contact finger has passed beyond
the pawl, it mounts upon the same, since by reason of the inclined surface of the latter
it cannot pass underneath, and thus the said contact finger, when the operating lever
is moved to reassume its middle position, passes above but not in contact with its
corresponding fixed contact piece so that the circuit is not closed, no current passes,
and consequently no notion of the electro motor is produced.
The operating lever falls, under the action of a spring, behind a shoulder of the
pawl back upon an insulating plate which carries the pawl and the adjacent fixed
contact ninnas

page_text: Motion of the electro motor in the opposite direction is effected by moving the
operating lever to the other side of its middle position whereby the contact fingers are
brought into contact with other fixed insulated contact pieces respectively. The
current from the dynamo or generator then passes by a terminal carried by one of the
said fixed insulated contact pieces to the electro motor by the corresponding contact piece
and contact finger and the terminal carried by the latter, and imparts to the electro motor
a direction of motion the reverse of that previously imparted as before described,
returning to the generator by the terminal carried by the other contact finger, the
operating lever, the said contact finger, the corresponding fixed contact piece and the
terminal carried by the latter.
The motion thus imparted to the electro motor is arrested in an analogous manner
to that previously described, by continuing to move the lever until the respective
contact finger passes underneath a corresponding pawl which then immediately falls
back, the lower brake block acting upon the flywheel.
As soon as the motion of the flywheel is arrested, the operating lever is moved again
into its mid le position, the last mentioned contact finger in this case passing over the
last mentioned pawl and falling back into its place behind a shoulder.
'
Springs may be employed to keep the pawls bearing against the insulated plate, so
that the corresponding contact finger after having raised one or other of the said
pawls by sliding under the same in one direction is obliged to mount the inclined plane
formed by its upper portion.
Dated this 7th day of June 1890.
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improved Combined Brake and Circuit Making and Breaking
Device for use with Electric Motors.
I, ALBERT PIAT of 15 Rue des Halles, Paris, France, 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 :-
This invention relates to an electro mechanical apparatus comprising a brake and
commutator or switch designed to control the motion of an electro motor and also
another machine driver, thereby to arrest the 'motion of these machines, and to change
the direction thereof as desired.
In the annexed drawings in which the brake forming part of the apparatus is
shown as applied to control a flywheel which may be that of a hydraulic riveting
machine.
Fig. 1 is a side elevation of the apparatus.
Fig. 2 is a plain of the same.
Fig. 3 is a detail view, to a larger scale.
The apparatus comprises a lever I connected with the electro motor to be con-
trolled, and provided with brake blocks S S¹, that act against the flywheel of the
electro motor, which latter is electrically connected with a dynamo or other. generator
by means of conductors and terminals, a a¹, and b; b', contact pieces D, E, G, and I,
and contact fingers C, F, arranged on the lever L.
Assuming the lever L to be in its middle position as shewn in Fig. 1; then in order
to cause notion of the electro motor say in a forward-direction the lever is raised
gradually until the finger C comes in contact with the contact piece D which is fixed
on an insulating support and carries the terminal a to which is connected: the wire
coming from the generator. At the same time the finger F will have come in contact
with the contact piece G carrying the terminal al to which is connected a wire leading
to the generator: The "current then enters by the terminal a, flows. through the
contact D, and the finger C, to the lever L, the axis or shaft of which is-niounted on

page_text: an insulating plate, and passes to the electro motor by the terminal d, producing the
required rotary motion; the current returns from the electro motor to the lever L by
a terminal whence it passes by means of the finger F and contact G, by the
terminal a¹ to the dynamo or other generator.
To arrest the motion of the electro motor, the raising of the lever is continued until
the finger F. has passed under the pawl or spring guide plate H, in its passage raising
that plate, which falls back under the action of the spring m as soon as the finger has
passed by.
In this movement, braking is produced with the upper brake block simultaneously
with the cessation of the current and the machine is thus stopped. The lever L can
be returned to its central position without setting the electro motor in motion, as,
although the finger C will again pass over the contact D, the finger F will not come
in contact with the contact G, so that the circuit will not be closed and no current will
flow. In this return movement the finger F will not pass under the plate H but will
slide over its upper surface passing above the contact G and falling, under the action
of the spring n, back upon the insulating plate P behind the shoulder o of the
plate H.
Motion in the opposite direction is effected in a similar manner, with the difference
that the lever is depressed instead of being raised, and thus the fingers C and F are
brought into contact with the contacts E and I, respectively. The current from
the generator then enters by the terminal and passes to the electro motor by the
contact 1, finger F and terminal d', and imparts to the electro motor motion in the
reverse direction to that previously imparted, after which the current returns to
the generator by the terminal d, lever L, finger C, contact E, and terminal b.
Motion is arrested in an analogous manner to that previously described, by con-
tinuing to depress the lever until the finger F passes underneath the pawl or spring
guide plate J which then immediately falls back, the lower brake block acting upon
the flywheel.
As soon as the motion of the flywheel is stopped, the lever is raised again into its
middle position, the finger F in this case passing over the plate J and falling back
into its place behind the shoulder o'.
Fig. 3 is a detail view on a larger scale shewing the arrangement of the plates H
and in relation to the finger F on the plate P.
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 1
claim is:
A combined brake and circuit making and breaking device for use with an electro
motor and another machine driven thereby, comprising an operating lever L provided
with brake shoes arranged to act upon a moving part of the electro motor when the
electric circuit is broken, and furnished with insulated fingers C, F, adapted in con-
junction with insulated contact pieces D, E and G, I, to establish currents in one or
other of two directions, and thereby produce motion of the electro motor in one
direction or the other according to the direction in which the operating lever is
moved, and spring guide plates having inclined upper surfaces the arrangement being
such that the finger F is caused to pass over one of these spring plates and out of
contact with the contact G or I when the lever is returned to its normal position after
braking the electric circuit and applying the brake substantially as described and
shewn.
"
T
1000
A. PIAT,
By L. W. per F. B.