IMPROVEMENTS IN APPLYING ROPES, CHAINS, OR BELTS FOR DRIVING MACHINERY, OR FOR OTHER PURPOSES." CHAINS. OR BELTS FOR DRIVING MACHINERY, OR FOR OTHER PURPOSES.” PROVISIONAL SPFICATION
Year: 1875

page_text: LETTERS PATENT to Martyn John Roberts, of the City of Bath,
Esquire, for the Invention of "IMPROVEMENTS IN APPLYING ROPES,
CHAINS, OR BELTS FOR DRIVING MACHINERY, OR FOR OTHER PURPOSES."
CHAINS.
OR BELTS FOR DRIVING MACHINERY, OR FOR OTHER PURPOSES.”
PROVISIONAL SPECIFICATION left by the said Martyn John Roberts
at the Office of the Commissioners of Patents, with his Petition,
on the 27th October 1875.
I, MARTYN JOHN ROBERTS, of the City of Bath, Esquire, do hereby
declare the nature of the said Invention for "IMPROVEMENTS IN
APPLYING ROPES, CHAINS, OR BELTS FOR DRIVING MACHINERY, OR FOR OTHER
PURPOSES," to be as follows:
My Invention has reference to apparatus in which an endless rope,
belt, chain, or the like is passed over or round drums, pulleys, or other
similar bodies for the purpose of transmitting motion to drive

page_text: machinery or for other purposes, hoisting for example; and the
primary object of my improvements is to prevent "slip," and at the
same time the riding of one coil or lap of the rope upon another
coil or lap, or the working or creeping of the rope to one side of the
drum.
In front of each of the drums I place an auxiliary drum or pulley,
and I lap the rope once or oftener round both the main drum and
the auxiliary drum before leading it off to the other main drum; I also
incline the axis of one or more of the drums to the axes of the others
so that they may not be parallel to each other.
In some cases I dispense with the auxiliary drums, and then I lap or
coil the rope round the main drums only, the axes of these drums being
inclined to each other; or sometimes I lap or coil the rope over the
main drum and one auxiliary pulley or guide.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Martyn John Roberts in the Great Seal Patent
Office on the 27th April 1876.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, MARTYN
JOHN ROBERTS, of the City of Bath, Esquire, send greeting.
WHEREAS Her most. Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-seventh day of October, in the
year of our Lord One thousand cight hundred and seventy-five, in
the thirty-ninth year of. Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said Martyn John Roberts, Her
special licence that I, the said Martyn John Roberts, my executors,
administrators, and assigns, or such others as I, the said Martyn John
Roberts, my executors, administrators, and assigns, should at any time
agree with and no others, from time to time and at all times there-
after 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 In-
vention for "IMPROVEMENTS IN APPLYING ROPES, CHAINS, OR BELTS FOR
DRIVING MACHINERY, OR FOR OTHER PURPOSES," upon the condition (amongst

page_text: others) that I, the said Martyn John Roberts, my executors or admini-
strators, by an instrument in writing under my, or their, or one of
their hands and seals, should particularly describe and ascertain the
nature of the said Invention, 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 Martyn John Roberts, do hereby
declare the nature of my 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, reference being had to the
accompanying Drawings, that is to say :-
My Invention has reference to apparatus in which an endless rope,
belt, chain, or the like is passed over or round drums, pulleys, or other
similar bodies for the purpose of transmitting motion to drive
machinery, or for other purposes, hoisting for example; and the
primary object of my improvements is to prevent "slip," and at the
same time the riding of one coil or lap of the rope upon another
coil or lap, or the working or creeping of the rope to one side of the
drum.
In front of each of the drums I place an auxiliary drum or pulley,
and I lap the rope once or oftener round both the main drum and the
auxiliary drum before leading it off to the other main drum, or the rope
may be led over the main drum and the auxiliary drum alternately. I
also incline the axis of one or more of the drums to the axes of the
others, so that they may not be parallel to each other.
In some cases I dispense with the auxiliary drums and then I lap or
coil the rope round the main drums only, the axes of these drums being
inclined to each other; or sometimes I lap or coil the rope over the
And sometimes when
main drums and one auxiliary pulley or guide.
I use only one auxiliary drum or pulley I lap the rope only once round
the auxiliary pulley, however often it may be lapped around the main
drums or pulleys.

page_text: A, A', are the two main drums, and B, B', are two auxiliary drums.
placed near the respective main drums. It will be seen that the axes of
the drums B, B', are inclined to the axes of the main drums A, A',
and also to each other. The rope C from the drum A is passed or
lapped several times round both the drums A' and B', as shewn, before
returning to the drum A, and it is also similarly lapped round both the
drums A and B.
Figure 3 is a plan of an arrangement in which the auxiliary drums
are dispensed with. In this case the main drums have their axes
inclined to each other, and the rope is lapped several times round each
drum before passing to the other.
Figure 4 represents in clevation, and Figure 5 in plan another
arrangement in which only one auxiliary drum is employed; it is shewn
as placed behind one of the main drums, that is to say, not between
these drums, and I am by this means enabled to place the main drums |
near together. The axis of the main drum A is inclined to that of the
main drum A', and the auxiliary pulley may run vertically or hori-
zontally or in an inclined position to the vertical and have the cord
lapped only once around it.
Figures 6 and 7 represent the manner in which my Invention may
be applied to a differential pulley hoist. A is the differential pulley,
and B, B', is an auxiliary pulley, the axis of which is inclined to that
of the pulley A. The pulley B, B¹, is also made differential, or of
portions of different diameters; its two portions B and B are not in a
piece with each other, and they may both run loosely upon a fixed axle.
The object of this is to allow the portions of the auxiliary pulley B, B',
to accommodate their speeds to the different sized portions of the main
pulley. C is the cord which on reaching the pulley A from the block D
passes several times round both the larger part of the pulleys A and B
then descends and forms a "fall" C', next ascends, passes several times
round the smaller parts of the pulleys A and B', and then descends to
the block D to the point of starting.
And having now described the nature of my said Invention and in
what manner the same is to be performed, I declare that I claim as my
Improvements in Applying Ropes, Chains, or Belts for Driving
Machinery, or for other Purposes,”-
"
First. The employment in combination with drums, pulleys, or other

page_text: similar bodies which drive or are driven by endless ropes, belts, chains,
or the like, of one or more auxiliary drums or pulleys, the axis of one
or more of the main or auxiliary drums or pulleys being inclined to the
axes of the others, substantially as and for the purpose herein-before
described.
Second. The inclining to each other of the axes of two drums,
pulleys, or other similar bodies, one of which drives the other by means
of an endless rope, belt, chain, or the like, and the lapping of the rope,
belt, or chain several times round each drum, pulley, or other similar
body, substantially as and for the purpose herein-before described.
In witness whereof, I, the said Martyn John Roberts, have here-
unto set my hand and seal, this Twenty-second day of April,
One thousand eight hundred and seventy-six.