Improvements in Fast and Loose Pullies for Rope Driving Purposes.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in Fast and Loose Pullies for Rope Driving Purposes.
We WILLIAM KENYON, GEORGE HENRY KENYON and EDWIN KENYON all of the Firm
of William Kenyon and Sons, of the Chapel-field Rope Works, Dukinfield, in the
County of Chester, Rope Makers, do hereby declare the nature of this invention to be
as follows:-
Our said invention relates to grooved rope driving pullies similar to the type for which
we have obtained Her Majesty's Letters Patent No. 5834 of 1893. Particularly our
invention refers to rope driving pullies applied to machines which require to be
frequently started and stopped, and therefore fitted with fast and loose pullies.
In carrying our present invention into effect we form on the fast pulley and side
by side with the driving groove a secondary shallower starting groove. This
additional groove is on the side next to the loose pulley and the walls of the groove
are preferably at a less acute angle than those of the driving groove.
The said additional groove might however be round in section or of an open vee shape.
The side of the loose pulley groove which is next to the fast pulley is lower and less
acute than the outer side and its apex coincides with the apex of the secondary
groove. By this arrangement the rope is easily shifted by the fork from the loose to
the fast pulley or vice versa. On being shifted, the rope falls first into the aforesaid
auxiliary groove in the fast pulley. At first the rope tends to slip in the groove and
thereby starts the fast pulley gradually and even when the pulley revolves at the
same speed as the rope the auxiliary groove being of larger circumference than the
driving groove, the pulley runs at a lower speed than it attains when the rope finally
drops, as it does immediately, into the proper driving groove.
This progressive movement makes the starting of the fast pulley more gradual and
jars the machine less, besides putting less strain on the rope. The meeting edges of
the pullies and the inner edge of the driving groove in the fast pulley are rounded so
as to allow the rope to pass more easily over them. The groove of the loose pulley is
preferably circular in section but the groove of the fast pulley is made deeper-and
more acute so as to bite the rope. The loose pulley runs or may run as in our
former invention upon a prolongation from the boss of the fast pulley so that the
combination is complete in itself for application to a shaft.
Dated the 22nd day of December 1896.

page_text: Improvements in Fast and Loose Pullies for Rope Driving Purposes.
We WILLIAM KENYON, GEORGE HENRY KENYON and EDWIN KENYON all of the Firm
of William Kenyon and Sons, of the Chapel-field Rope Works, Dukinfield, in the
County of Chester, Rope Makers, 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 and accompanying drawings:-
Our said Invention relates to grooved driving pullies similar to the type for which
we have obtained Her Majesty's Letters Patent No. 5834 of 1893. Particularly our
invention refers to rope driving pullies applied to machines which require to be
frequently started and stopped, and therefore fitted with fast and loose pullies.
Our invention will be readily understood from an inspection of the accompanying
drawing.
The drawing shows a sectional view of the fast and loose pullies to which our
invention is applied.
The loose pulley a is mounted to revolve upon a prolongation b of the boss of the
fast pulley c as described in our said Patent No. 5834 of 1893 so that the combination
is complete in itself for application to a shaft. If desired however the loose pulley
may be mounted to revolve upon the shaft d.
Upon the grooved fast pulley c we form a secondary shallower starting groove cl
side by side with the driving groove c².
This additional groove c¹ is on the side next to the loose pulley a and the walls of
the groove c¹ are preferably at a less acute angle than those of the driving groove c².
The said additional groove c¹ might however be rounded in cross section or of any
angular formation. The side of the loose pulley groove which is next to the fast
pulley is lower and less acute than the outer side and its apex coincides with the apex
of the secondary groove as shown in the drawing. By this arrangement the rope is
easily shifted by the fork from the loose to the fast pulley or vice versa. On being
shifted, the rope falls first into the aforesaid auxiliary groove in the fast pulley. At
first the rope tends to slip in the groove and thereby starts the fast pulley gradually,
and even when the pulley revolves at the same speed as the rope the auxiliary groove
being of larger circumference than the driving groove, the pulley runs at a lower
speed than it attains when the rope finally drops, as it does immediately, into the
proper driving groove. This auxiliary groove might in some cases be of equal
circumference as the driving groove.
In the drawing the driving rope e is shown dotted in the loose pulley and in the
additional groove c' to which it is first shifted, and in full in the position it finally
occupies in the groove c² of the fast pulley c.
This progressive movement of the driving rope e makes the starting of the fast
pulley c more gradual and jars the machine less, besides putting less strain on the
rope. The meeting edges of the pullies and the inner edge of the driving groove in
the fast pulley are rounded so as to allow the rope to pass more easily over them.
The groove of the loose pulley a is preferably circular in section but the groove c²
of the fast pulley c is made deeper and more acute so as to bite the rope e.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is.
In fast and loose grooved rope driving pullies, forming the fast pulley with an
intermediate or secondary starting groove, into which the driving rope is easily

page_text: shifted when starting or stopping the fast pulley, so as to render the starting and
stopping more gradual substantially as described and illustrated.
Dated this 22nd day of September 1897.
For the Applicant,
E. K. DUTTON & Co.,
5 John Dalton Street, Manchester, Chartered Patent Agents.