An Improved Pulley for use in Driving Dynamo-electric Machines.
Year: 1891

page_text: Date of Application, 29th Apr., 1891
Complete Specification Left, 29th Jan., 1892-Accepted, 5th Mar., 1892
PROVISIONAL SPECIFICATION.
An Improved Pulley for use in Driving Dynamo-electric Machines.
We, ARTHUR WEST HEAVISIDE, of 7 Grafton Road, Whitley, R.S.O.
Northumberland and ROBERT CATTLEY JACKSON, of 7 Loraine Crescent
Newcastle-upon-Tyne, Engineers, and JOHN RICHARDSON, of the firm Robey
and Co. City of Lincoln, Engineer, do hereby declare the nature of this invention
to be as follows:-
This invention has for object, the construction of pullies for alternating current
dynamos in such manner that the speed of rotation of each dynamo so fitted is not
affected by variations of speed of the engine that may arise from any cause.
For the purpose of our invention, we provide the pulley proper with lugs within
it, and also with faced surfaces in its inner periphery.
The lugs have casings containing springs attached, the opposite ends being linked
to lugs of plates, or rims of internal pulley like frames, with faced surfaces to
bear and slide against the faced surfaces of the pulley proper under the action
of the springs. This internal frame has its boss affixed on the dynamo shaft,
which becomes driven from the pulley proper through the springs which connect
them.
Dated this way on pu
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said :-
Arthur West Heaviside,
Robert Cattley Jackson,
COMPLETE SPECIFICATION.
An Improved Pulley for use in Driving Dynamo-electric Machines.
We, ARTHUR WEST HEAVISIDE, of 7 Grafton Road, Whitley, R.S.O.
Northumberland, ROBERT CATTLEY JACKSON, of 7 Loraine Crescent, Newcastle-
upon-Tyne, and JOHN RICHARDSON of the firm Robey and Co., City of Lincoln,
Engineers, 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 has for object, the construction of pullies for alternating current
dynamos in such manner that the speed of rotation of each dynamo so fitted
is not affected by variations of speed of the engine that may arise from any
cause.
For the purpose of our invention, we provide the pulley proper with lugs
within it and also with faced surfaces in its inner periphery. The lugs have
casings containing springs attached, the opposite ends being linked to lugs of
plates or rims of internal pulley like frames, with faced surfaces to bear and slide
against the faced surfaces of the pulley proper under the action of the springs.
This internal frame has its boss affixed on the dynamo shaft which becomes driven
from the pulley proper through the springs which connect them.
Figure 1 of the annexed drawings represents a side elevation with half the boss
and rim in section. Figure 2 being a transverse section.
A is the boss keyed to the dynamo shaft. B, and B', B2, B³, are arms upon

page_text: said boss. C¹, C³, C³, are lugs upon the loose ring. D and D', D2, D³, show the
circular casing of the boss, upon which slides easily the loose ring E. F shows one
of the cylindrical casings enclosing a spring, the end of casing F being attached to
the arm B² of boss, and the inner casing G to the lug C₁ of the loose ring E.
Between F and G is a strong coiled spring.
Any number of these spring boxes may be used in proportion to the power
required to be transmitted. In the pulley shown there are three pairs 6 in all.
By means of the threaded spindle and nuts H, H, the tension of the spring can be
adjusted to the load. If two or more alternate current dynamos be of similar
construction, each fitted with a pulley of this kind, and the transmitted power be
absolutely uniform and equal, they will revolve at equal speeds as though the pulley
were solid, but if through any slight irregularity, either in the power, the thickness
of the belt, or the jointing of the ropes through which the power is transmitted
there be a difference, the tendency would be for a fraction of a second for one
pulley to run faster than the other, and this result must take place if the pulley
were solid and rigid, but as the tendency of alternate current dynamos running
parallel is to remain in phase with each other, when an elastic pulley as shown is
provided, the pulley accommodates itself to minute irregularities and the armatures
of the dynamos remain absolutely parallel.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim is
An elastic pulley arranged as shown on the annexed drawings and as and for the
Durnose described
The 29th day of January 1892.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said :-
Arthur West Heaviside,
Robert Cattley Jackson,
and
John Richardson.