IMPROVEMENTS IN THE CANDARZAST Ал V DIF HAR min D&NOWTOPION OR PAWED " PROVISIONAL SPECIFICATION left.
Year: 1873

page_text: LETTERS PATENT to Fleeming Jenkin, of No. 5, Fettes Row, Edin-
burgh, and Frederick Henry Ricketts, of Stanton Villa, Putney, in
the County of Surrey, for the Invention of "IMPROVEMENTS IN THE
CANDARZAST
Ал
V DIF
HAR min
D&NOWTOPION OR PAWED "
PROVISIONAL SPECIFICATION left by. the said Fleeming Jenkin
and Frederick Henry Ricketts at the Office of the Commissioners
of Patents, with their Petition, on the 24th May 1873.
We, FLEEMING JENKIN, of No. 5, Fettes Row, Edinburgh, and
FREDERICK HENRY RICKETTS, of Stanton Villa, Putney, in the County
of Surrey, do hereby declare the nature of the said Invention for " Iм-
PROVEMENTS IN THE CONSTRUCTION OF V PULLEYS FOR THE TRANSMISSION OF
POWER," to be as follows:-
Our Invention is intended to prevent or diminish the slipping of ropes

page_text: sufficient to prevent the rope or belt from slipping. The belt thus
tightened causes injurious friction in the bearings of the shafting; it
also strains the belt and shafting to an extent which is unnecessary
when adhesion can be attained with less tension on the belt. The
injurious friction causes power to be wasted in the act of transmission.
Our Invention increases the adhesion and diminishes the slip, and there-
fore diminishes the power wasted in transmission. It is also useful in
all cases in which we desire to hold a rope of any kind in a V pulley.
The Invention consists in leaving out the one side of the V in strips
alternately on each side, so that the rope is pressed alternately on each
side.
The V groove pulley may be made from a circular plate of wrought
iron by making evenly spaced cuts from the outer circumference to a
second concentric circumference drawn within the first, and then bending
the alternate leaves or teeth to opposite sides of the plate. Thus a
V groove is formed all around the pulley, and the centre line of the
groove is in one plane; the leaves may be joined at their outer cir-
cumference by a ring. The appearance of this wheel, whether formed
in this manner or otherwise, is shewn in the diagram annexed.
SPECIFICATION in pursuance of the conditions of the Letters Patent, 2
filed by the said Fleeming Jenkin and Frederick Henry Ricketts
in the Great Seal Patent Office on the 24th November 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, FLEEMING
JENKIN, of No. 5, Fettes Row, Edinburgh, and FREDERICK HENRY
RICKETTS, of Stanton Villa, Putney, in the County of Surrey, send 2
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-fourth day of May, in the year of
our Lord One thousand eight hundred and seventy-three, in the
thirty-sixth year of Her reign, did, for Herself, Her heirs and successors, 3
give and grant unto us, the said Fleeming Jenkin and Frederick Henry
Ricketts, Her special license that we, the said Fleeming Jenkin and
Frederick Henry Ricketts, our executors, administrators, and assigns,

page_text: or such others as we, the said Fleeming Jenkin and Frederick Henry
Ricketts, our executors, administrators, and assigns, should at any
time agree with, and no others, from time to time and at all times
thereafter during the term therein expressed, should and lawfully
might make, use, exercise, and vend, within the United Kingdom of
Great Britain and Ireland, the Channel Islands, and Isle of Man, an
Invention for "IMPROVEMENTS IN THE CONSTRUCTION OF V PULLEYS FOR THE
TRANSMISSION OF POWER," upon the condition (amongst others) that we,
the said Fleeming Jenkin and Frederick Henry Ricketts, our executors
or administrators, by an instrument in writing under our or their
hands and seals, or under the hand and seal of one of us or them,
should particularly describe and ascertain the nature of the said In-
vention, and in what manner the same was to be performed, and cause
the same to be filed in the Great Seal Patent Office within six calendar
months next and immediately after the date of the said Letters Patent..
NOW KNOW YE, that I, the said Fleeming Jenkin, on behalf of
myself and the said Frederick Henry Ricketts, do hereby declare the
nature of the said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say:-
Our Invention is intended to prevent or diminish the slipping of ropes
or belts lying in V pullies.
The
When ordinary V pullies are employed to transmit power the endless
rope or belt must be tightened until the friction in the groove is
sufficient to prevent the rope or belt from slipping. The belt thus
tightened causes injurious friction in the bearings of the shafting; it
also strains the belt and shafting to an extent which is unnecessary
when adhesion can be attained with less tension on the belt.
injurious friction causes power to be wasted in the act of transmission.
Our Invention increases the adhesion, and diminishes the slip, and there-
fore diminishes the power wasted in transmission. It is also useful in
all cases in which we desire to hold a rope of any kind from slipping
round a V pulley.
.
The Invention consists in leaving out the one side of the V in atmina

page_text: The V groove pulley may be made from a circular plate of wrought
iron by making evenly spaced cuts from the outer circumference to a
second concentric circumference drawn within the first, and then bending
the alternate leaves or teeth to opposite sides of the plate. Thus a
V groove is formed all around the pulley, and the centre line of the
groove is in one plane; the leaves may be joined at their outer cir-
cumference by a ring. The appearance of the wheel, whether formed
in this manner or otherwise, is shewn in the Drawing annexed.
Two such wheels are in each case employed, one upon the driving
shaft, and the other upon the driven shaft. They may be either of the
same or of different sizes, according to the speed at which it is required
that the driven shaft should be rotated. An endless rope, either hempen
or wire, surrounds the two wheels, but loosely, so that the return side
of the rope is exposed to a very small tensile strain.
The form of the wheels effectually prevents the rope slipping either
upon the driving or driven wheels, and although the centre of the rope
groove on each wheel is straight, or in the same plane throughout, the
rope passing around the wheels is never, as will be observed, jammed
between two opposing surfaces, but always when exposed to pressure on
one side it is free upon the other.
What we claim is the construction of V pullies for the transmission of
power, substantially in the manner described.
In witness whereof, I, the said Fleeming Jenkin, have hereunto set
my hand and seal, this Twenty-first day of November, in the year
of our Lord One thousand eight hundred and seventy-three.