Improvements in the Regulation of Dynamos Driven by Gas and Oil Engines.
Year: 1891

page_text: Date of Application, 30th Oct., 1891
Complete Specification Left, 28th July, 1892-Accepted, 1st Oct., 1892
PROVISIONAL SPECIFICATION.
Improvements in the Regulation of Dynamos Driven by Gas and
Oil Engines.
FRANCIS EDWARD GRIPPER of 19 Great George Street Westminster
Electrical Engineer & SIMON COYLE of 39 Bonnington Square Vauxhall
Engine Fitter do hereby declare the nature of this invention to be as follows:-
The invention is for compensating the irregular action in gas & oil engines
which takes place owing to the impulses in the cylinder being sudden and
intermittent and which irregular action is very detrimental when such engines are
employed for electric lighting purposes. The apparatus consists of a resistance
coil or rheostat and a switch for throwing the whole or part of such resistance
into either the field magnet circuit of the dynamo or into the main circuit going
to the lamps.
This switch is set in action by a small piston in connection with the main
cylinder of the engine so that the resistance is inserted at the moment when the
impulse or explosion takes place in the cylinder, thus preventing any excess of
pressure being given out by the dynamo machine on account of the accelerated
speed due to such sudden impulse.
Dated this 28th day of October 1891.
1
FRANCIS EDWARD GRIPPER.
SIMON COYLE.
COMPLETE SPECIFICATION.
Improvements in the Regulation of Dynamos Driven by Gas and
Oil Engines.
We FRANCIS EDWARD GRIPPER of 19 Great George Street Westminster
Electrical Engineer, and SIMON COYLE of 39 Bonnington Square Vauxhall,
Engine Fitter, 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 invention is for compensating the irregular action in gas and oil engines
which takes place owing to the impulses in the cylinder being sudden and inter-
mittent and which irregular action is very detrimental when such engines are
employed for electric lighting purposes. The apparatus consists of a resistance
coil and a switch for throwing the whole or part of such resistance into either the
field magnet circuit of the dynamo or into the main circuit going to the lamps.
This switch is brought into action by a piston working in a small cylinder in
connection with the main cylinder of the engine so that the resistance is inserted
at the moment when the impulse or explosion takes place in the cylinder thus
preventing any excess of current being given out by the dynamo machine on
account of the accelerated speed due to such impulse.
Referring to the accompanying drawing, a small cylinder e surrounded by a water
jacket d to keep down the temperature is attached by a connection E to the main
cylinder of the engine b and P are respectively the piston and piston rod working
in this cylinder c.
To the crosshead a is attached a contact L sliding over the fixed contacts K
KK to which the field magnet wires are connected and the terminals of the
resistance coil Ras shown

page_text: The resistance is introduced into the circuit in proportion to the distance the
piston bis driven out by the explosion.
G. G. are the guides of the crosshead a.
F. F. are springs for bringing the piston back again after the explosion has
taken place.
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 :-
1. A regulating apparatus as described for controlling the fluctuations in the
current generated by dynamo electric machines when driven by gas or oil engines,
by utilizing the explosions in the cylinders of such engines for automatically
inserting resistance in the field or main circuit of the dynamo at the proper
moment.
Signed this 16th day of September 1892.
FRANCIS EDWARD GRIPPER.
SIMON COYLE.