IMPROVEMENTS IN OR ADDITIONS TO CERTAIN KINDS OF PULLEYS FOR RAISING HEAVY WEIGHTS.
Year: 1862

page_text: LETTERS PATENT to James Tangye, of the Firm of Tangye Brothers and
Price, of Birmingham, in the County of Warwick, Manufacturers, for
the Invention of "IMPROVEMENTS IN OR ADDITIONS TO CERTAIN KINDS OF
PULLEYS FOR RAISING HEAVY WEIGHTS.'
Sealed the 3rd March 1863, and dated the 20th October 1862.
PROVISIONAL SPECIFICATION left by the said James Tangye at the
Office of the Commissioners of Patents, with his Petition, on the
20th October 1862.
I, JAMES TANGYE, of the Firm of Tangye Brothers and Price, of Bir-
mingham, in the County of Warwick, Manufacturers, do hereby declare the
nature of the said Invention for "IMPROVEMENTS IN OR ADDITIONS TO CERTAIN.
KINDS OF PULLEYS FOR RAISING HEAVY WEIGHTS," to be as follows:-
My said Invention relates to pulleys of the kind called differential pulleys,
that is, pulleys of the kind described in the Specification of Letters Patent
granted to Thomas Aldridge Weston, bearing date the Twenty-fifth day of
April, One thousand eight hundred and fifty-nine, No. 1033, and consists of
the mechanical arrangements herein-after described, by the use of which the
said differential pulleys may be applied to the lifting of heavier bodies than
they can conveniently be applied to the lifting of as ordinarily constructed.
To the axis of the pulley I attach a toothed wheel, with which toothed
wheel a pinion on. another and parallel axis engages. The axis of the said
pinion carries a ratchet lever or winch with which to turn it, or is provided
with a sprocket wheel with an endless band passed over it for the same
purpose. By giving a rotatory motion to the axis of the pinion a slow motion
is given to the differential pulley.

page_text: By my Invention differential pulleys may be made very powerful without
increasing the size of the pulleys to an inconvenient extent. Although a train
of one toothed wheel and a pinion is sufficient for all ordinary purposes, yet
multiplying gear consisting of a longer train of toothed wheels may be
employed where it is desirable. The toothed wheel and pinion may either
work within or without the frame carrying the pulley. Where the pulley is
small the toothed wheel may be conveniently made hollow, the pinion taking.
into teeth on its inner surface.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said James Tangye in the Great Seal Patent Office on the
14th April 1863.
.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
TANGYE, of the Firm of Tangye Brothers and Price, of Birmingham, in the
County of Warwick, Manufacturers, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twentieth day of October, in the year of our Lord
One thousand eight hundred and sixty-two, in the-twenty-sixth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said James Tangye, Her special licence, that I, the said James Tangye, my
executors, administrators, and assigns, or such others as I, the said James
Tangye, my 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, exrecise, and
vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN OR
ADDITIONS TO CERTAIN KINDS OF PULLEYS FOR RAISING HEAVY WEIGHTS," upon the
condition (amongst others) that I, the said James Tangye, my executors
or administrators, by an instrument in writing uuder 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 James Tangye, 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 :-

page_text: My said Invention relates to pulleys of the kind called differential pulleys,
that is, pulleys of the kind described in the Specification of Letters Patent
granted to Thomas Aldridge Weston, bearing date the Twenty-fifth day of
April, One thousand eight hundred and fifty-nine, No. 1033, and consists of
the mechanical arrangements herein-after described, by the use of which the
said differential pulleys may be applied to the lifting of heavier weights than
they can conveniently be applied to the lifting of as ordinarily constructed.
To the axis of the pulley I attach a toothed wheel, with which toothed
wheel a pinion on another and parallel axis engages. The axis of the said
pinion carries a ratchet lever or winch with which to turn it, or is provided
with a spocket wheel with an endless band passed over it for the same
purpose. By giving a rotatory motion to the axis of the pinion a slow motion
is given to the differential pulley.
By my Invention differential pulleys may be made very powerful without
increasing the size of the pulleys to an inconvenient extent. Although a train
of one toothed wheel and a pinion is sufficient for all ordinary purposes, yet
multiplying gear consisting of a longer train of toothed wheels may be
employed where it is desirable. The toothed wheel and pinion may either
work within or without the frame carrying the pulley. Where the pulley is
small the toothed wheel may be conveniently made hollow, the pinion taking
into teeth on its inner surface.
Having explained the nature of my Invention, I will proceed to describe,
with reference to the accompanying Drawing, the manner in which the same
is to be performed.
Figure 1 represents in front élevation, and Figure 2 in side elevation, a
differential pulley, to which said pulley that form of my Invention which I
prefer to use is applied; Figure 3 represents a section of the differential
pulley detached from its frame. The same letters indicate the same parts in
each Figure.
a is the differential pulley turning on the axis 6, the said axis being sup-
ported by the frame c; d is the looped endless chain of the differential pulley.
Excentric to the pulley, and parallel with its axis, is an axis e working in the
bearing carried by the frame c of the pulley. The axis e passes through the
frame c, and has a pinion g on its end, which pinion gears with the teeth
of the hollow toothed wheel h cast with the differential pulley a. Connected
with the axis of the pinion g is a spocket wheel i, on the periphery of which
the forks k are situated, between which forks an endless band or rope / is
passed. By giving motion to the endless band or rope l, the spocket wheel i
is made to rotate and communicate motion to the pinion g; the said pinion g

page_text: gears with the toothed wheel h, and gives a slow rotatory motion to the
differential pulley a. Instead of the spocket wheel i, by which the axis of
the pinion g is turned, the said axis of the pinion may be provided with a
ratchet lever or winch with which to turn it, but I prefer the arrangement
represented.
Although I find it convenient in the case of pulleys of small diameter to
make the pinion gear with a hollow-toothed wheel inside of the pulley, yet the
said pinion may gear with a toothed wheel the teeth of which are formed on
the periphery of the pulley; or the said pinion may gear with a separate
toothed wheel fixed on the axis of the pulley. In this last case I prefer to
place both the pinion and toothed wheel outside the frame carrying the
differential pulley. Instead of making the pinion on the axis which carries
the spocket wheel, or ratchet lever, or winch, gear directly with the toothed
wheel of the differential pulley, multiplying gear may be placed between the
said pinion and toothed wheel of the differential pulley.
Having now described the nature of my Invention, and the manner in
which the same is to be performed, I wish it to be understood that I do not
limit myself to the precise details herein described and represented, as the
same may be varied without departing from the nature of my Invention; but
I claim as my Invention the improvements in or additions to differential
pulleys for raising heavy weights, herein-before described, and illustrated in
the accompanying Drawing, that is to say, transmitting power to the said
differential pulleys by means of a pinion or a train of toothed wheels gearing
with a toothed wheel on the inside or outside of the differential pulley, or con-
nected with the axis of the differential pulley; the axis of the said pinion
being provided with a spocket wheel, or with a ratchet, lever, or winch, by
which the said axis is turned.
In witness whereof, I, the said James Tangye, have hereunto set my
hand and seal, this Thirteenth day of April, in the year of our Lord
One thousand eight hundred and sixty-three.
Witness,
GEORGE SHAW.
JAMES TANGYE. (L.S.)