Improvements in Automatic Maximum Speed Governors for Electrically Propelled Vehicles.
Year: 1896

page_text: Improvements in Automatic Maximum Speed Governors for
Electrically Propelled Vehicles.
I, HORACE FIELD PARSHALL, of 38, Parliament Street, in the County of London,
Electrical Engineer, do hereby declare the nature of this invention to be as
follows:-
The object of my invention is to provide an efficient and reliable maximum
speed governor for electrically propelled vehicles which shall be capable of being
adjusted so as to automatically interrupt the source of power when any pre-
determined maximum speed has been attained so that such speed cannot be
exceeded by the driving power of the motor.
I may perform my invention by mechanical means or by electrical.
former case I employ in combination with a suitable automatic circuit-breaker a
centrifugal governor of any suitable type, either mounted upon or synchronously
operated by and with the main motor armature axle and connected by a system of
levers or other connections rigid or flexible with the reciprocating operating part
ef an automatic circuit-breaker, in such manner that the motion derived from
said governor when or just before maximum speed is reached is transmitted to
such automatic circuit-breaker and serves to open the circuit until the speed is
reduced.
I prefer however to employ electrical means, and in such cases I employ in
combination with an automatic circuit-breaker a small auxiliary generator of
electricity which may be a permanent magnet revolving upon or driven in
synchronism with the main motor shaft within an auxiliary stationary armature
of suitable kind (or vice versa); the stationary part is electrically connected by
in part flexible conductors to a stationary solenoid or equivalent preferably in
parallel with the main solenoid of the circuit-breaker; the core of the former is
coupled to the toggle links or to the reciprocating controlling part of a suitable
automatic circuit breaker such for example as that described in English
l'atent No. 8382, A.D. 1896, though I may adapt my invention to any other
suitable type of circuit-breaker. By this arrangement when the speed exceeds
the predetermined limit the current generated in the auxiliary armature will
correspondingly exceed and thus pull down the auxiliary solenoid core which
through its connections will operate the circuit-breaker and open the main circuit
which will not remain closed until the speed is reduced below the limit for which
the governor is adjusted.
Dated this 10th day of August, 1896.
J. C. CHAPMAN, C.P.A.,
Agent.

page_text: Improvements in Automatic Maximum Speed Governors for
Electrically Propelled Vehicles.
I, HORACE FIELD PARSHALL, of 83, Cannon Street, in the City of London, late
of 38, Parliament Street, Westminster, in the County of London, Electrical
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 :-
The object of my invention is to provide an efficient and reliable maximum
speed governor for electrically propelled vehicles which shall be capable of being
adjusted so as to automatically interrupt the source of power when any pre-
determined maximum speed has been attained so that such speed cannot be
exceeded by the driving power of the motor..
I may perform my invention by mechanical means or by electrical. In the
former case I employ in combination with a suitable automatic circuit-breaker a
centrifugal governor of any suitable type, either mounted upon or synchronously
operated by and with the main motor armature axle and connected by a system of
levers or other connections rigid or flexible with the reciprocating operating part
of an automatic circuit-breaker, in such manner that the motion derived from
said governor when or just before maximum speed is reached is transmitted to
such automatic circuit-breaker and serves to open the circuit until the speed is
reduced.
I prefer however to employ electrical means, and in such cases I employ in
combination with an automatic circuit-breaker a small auxiliary generator of
electricity which may be a permanent magnet revolving upon or driven in
synchronism with the main motor shaft within an auxiliary stationary armature
of suitable kind (or vice versa); the stationary part is electrically connected by
in part flexible conductors to a stationary solenoid or equivalent preferably in
parallel with the main solenoid of the circuit-breaker: the core of the former is
coupled to the toggle links or to the reciprocating controlling part of a suitable
automatic circuit-breaker such for example as that described in English
Patent No. 8382 A.D. 1896 of J. Devonshire (W. B. Potter) though I may adapt
my invention to any other suitable type of circuit-breaker.
In further explanation of my invention I have diagrammatically illustrated in
the accompanying drawings three distinct methods of control consisting as
described in reference to Figs. 1 and 2 of a combination of a centrifugal speed
governor with a standard automatic circuit-breaker such as is above referred to,
and in Fig. 3 of a combination of a small dynamo with the circuit-breaker.
The same reference letters indicate the same or like parts in the figures.
Referring to Figs. 1 and 2, A is the car axle, M the car motor, C the tripping
coil or solenoid acting upon the circuit-breaker of which M M are the magnet
coils, and B the air-gap; H is the handle for closing the circuit, T the toggle,
t a spring acting on same for opening the circuit, L a lever and latch for holding
the Toggle T in position and an adjustable spring connected thereto and
controlling the action of coil C.
G is a centrifugal governor driven from and synchronously with the car axle A
either directly as shown or indirectly. In Fig. 1, D) is a lever through which the
motion of the governor is transmitted to the latch L by means of the rod
connection d; as will be seen, in this case the mechanical action of the governor G
is transmitted to and acts directly on the latch L at the required times to open
the circuit.
Fig. 2 shows an alternative form of maximum speed governor consisting

page_text: in the combination with the centrifugal governor G and the circuit-breaker
of the local battery B¹: this is placed in the circuit of an auxiliary coil or
stationary solenoid C acting on an iron core or plunger P connected direct by
rod p with the latch L. In this case I provide in the battery circuit contacts b b
and the end d of the governor lever D' acts as a contact-maker adapted to close
the circuit of the battery B' and coil C which latter then retracts the plunger P
and so releases the latch or trigger L.
Fig. 3 illustrates a maximum speed governor_constructed according to my
invention and consisting of a Dynamo-Generator D mounted on the car axle A
or driven synchronously from it combined with the circuit-breaker. C is an
auxiliary coil or stationary solenoid in circuit with the Dynamo D and is its
core connected to latch L, the other parts being arranged as shown. In this case
when the current in the Dynamo Circuit exceeds a predetermined amount or in
other words, when the speed of the car exceeds the predetermined limit, the
current generated in the armature of the Dynamo D will correspondingly exceed
and thus pull down the auxiliary solenoid core P which through its connections
will operate the circuit-breaker and open the main circuit which will not remain
closed until the speed is reduced below the limit for which the governor is
adjusted.
Having now particularly described and a certained the nature of my said inven-
tion, and in what mannen the same is to be performed, I declare that what I
claim is :-
1. An automatic maximum speed governor for electrically propelled vehicles
consisting in the combination with a suitable kind of automatic circuit-breaker of
a centrifugal governor or a small auxiliary generator of electricity driven by
or synchronously with the car axle and connected in manner such as herein
specified with an operating part or latch controlling the said circuit-breaker in
such manner that when or just before maximum prearranged speed is reached
the action of the said driven part is transmitted to the operating part of the
circuit-breaker and opens the circuit until the speed is reduced.
2. An automatic maximum speed governor for the purpose referred to con-
sisting in the combination with a centrifugal governor driven with and from the
car axle directly or indirectly of a circuit-breaker, with controlling latch,
substantially as described in reference to Fig. 1 of the drawings.
3. An automatic maximum speed governor consisting in the combination with
a contrifugal governor such as is herein specified of a local Battery in circuit with
a stationary solenoid connected to the latch of the main circuit-breaker, said
battery circuit being controlled by the action of the governor G, the parts and
connections being arranged or adapted to operate substantially in the manner and
for the purposes set forth and illustrated in Fig. 2 of the drawings.
4. An automatic maximum speed governor consisting in the combination with
a Dynamo-Generator mounted on or driven synchronously with the car axle and in
circuit with a stationary solenoid and core connected to the latch, of a circuit-
breaker with controlling latch, the parts being arranged, electrically connected or
adapted to operate substantially as and for the purposes herein set forth and shown
in Fig. 3 of the Drawings.
Dated this 28th day of May, 1897.
For the Applicant,
J. C. CHAPMAN,
70 Chancery Lane, London, W.C., Chartered Patent Agent.