Improvements in Electric Magnetic Brakes for Railway and Tramway Cars.
Year: 1899

page_text: Date of Application, 17th July, 1899-Accepted, 11th Nov., 1899
COMPLETE SPECIFICATION.
Improvements in Electric Magnetic Brakes for Railway and
Tramway Cars.
We, PAUL FRANZ LOUIS ROBERT HERMANN KARL VOIGT, Fitter, of 3, Schloss-
strasse, Ilmenau, Germany, and WILHELM CHRISTOPH KUSTERER, Engineer,
3, Schloss-strasse, Ilmenau, Germany, do hereby declare the nature of our said
invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:
The object of the present invention is a magnetic brake for cars with electric
motive power.
In order that our invention may be more clearly understood and easily carried
into practical effect we have appended hereunto three double sized sheets of
drawings upon which we have illustrated examples of our improvements.
Figure 1 is a longitudinal section.
Figure 2 is a section from A to B in Figure 1.
Figure 3 is a partial top view of the brake.
Figure 4 is a view of the controlling mechanism.
Figures 5 and 6 are views of the brake under the car.
When the brake is required to be put into action the current is conducted
into the wrapping 1 of the electro magnet 2 which thereupon attracts the plate 3
and this plate when the electro magnet is not acting is kept away from it by
springs 4. On this plate 3 is a catch 5 which by means of a spring 6 is con-
tinuously pressed against a ratchet wheel 7. Fitted to the plate 3 is a controlling
mechanism so that consequently the plate is moved up and down continuously.
At cach upward movement the ratchet wheel 7 is moved one tooth forward and
therefore by further gearing the ratchet bar 8 is raised while a catch, 9 prevents
the ratchet wheel from moving backwards. Through this raising of the ratchet
bar 8, brake blocks 11 and 12 are forced against the wheels by means of pressure
rods 9 and 10 (see Figure 5).
To release the brake the current is conducted into the wrapping of a second
electro magnet 13 (see Figure 1) which attracts a plate 14 mounted as is also
the ratchet wheel 7 loosely upon an axle 15. By this means pegs 16 of the
disc 14 which pass through the ratchet wheel 7 and consequently couple this with
the plate 14 are drawn out of corresponding holes in a coupling disc 17 keyed
on to the axle 15 so that the fixed connection of the gearing with the ratchet
wheel is done away with. In consequence of this the ratchet bar 8 moves down-
ward by virtue of its own weight and the brake is released.
Figure 4 shows the controlling mechanism of this brake.
The conductor a brings the current through the contact
lever c.
If this is applied to the contact I the current passes through b to the
resistance and from this to the wrapping i of the electro magnet 2 and therefor
pulls up the plate 3 to pass through the earth conductor f. If now the lever c
is applied to the contact II the current passes from c through the conductor g
and resistance into the wrapping 13 of the other electro magnet. The ratchet
to the controlling

page_text: bar falls and puts into operation by means of arms or a spring the cut off i
which consequently cuts off the current which passes back to earth.
By means of a plug contact k the brake mechanism of different cars can be
coupled together and put into action simultaneously.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that
what we claim is:-
CLAIM.
An electro magnetic brake for cars with electric motive power characterised
by a catch on a plate set in motion by means of the motive current conducted
into the wrapping of an electro magnet on the Wagner hammer system making
a ratchet wheel revolve backwards which revolution by means of gearing raises
a ratchet bar which presses the brake blocks against the wheels whereupon by
switching the current into another electro magnet and pulling up the plate the
fixed connection of the ratchet bar gear with the ratchet wheel is done away
with so that the ratchet bar falls by its own weight and removes the brake
blocks from the wheels the ratchet har effecting the cutting off of each electro
magnet.
Dated this 15th day of Tul. 1000