IMPROVEMENTS: IN PULLEYS FOR RAISING AND LOWERING HEAVY-BODLES
Year: 1865

page_text: LETTERS PATENT to George Tangye, of Birmingham, in the County of.
Warwick, Mechanical Engineer, and Joseph Jewsbury, of .Kinver, in
the County of Stafford, Machinist, for the Invention of "IMPROVEMENTS:
IN PULLEYS FOR RAISING AND LOWERING HEAVY-BODLES.
•
PROVISIONAL SPECIFICATION left by the said George Tangye and
Joseph Jewsbury at the Office of the Commissioners of Patents, with
their Petition, on the 12th September 1865.
We, GEORGE TANGYE, of Birmingham, in the County of Warwick,
Mechanical Engineer, and JOSEPH JEWSBURY, of Kinver, in the County of
Stafford, Machinist, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN PULLEYS FOR RAISING AND LOWERING HEAVY BODIES," to be as
follows:-
1. f
Our, Invention, consists of the arrangements, herein-after described of the
parts of a compound pulley, and its band, whereby, a differential action. is
obtained, and great lifting power secured by the employment of few parts.in
the said pulley.

page_text: In constructing a pulley according to our Invention, we take two single
pulleys of similar diameter mounted in frames in the usual way, one of the said
pulleys to be hooked to a fixed support, and the other to the body to be
raised as in the case of ordinary pulleys. We connect the two pulleys
together in the following manner-We take an endless band and pass it over
the pulleys in this order. Starting at the ascending side of the top pulley the
band passes over that pulley, then descending passes under the bottom pulley,
ascending a second time it passes a second time over the top pulley, the
second layer of the band lying upon the first layer. Again descending the
band passes under the lower pulley, the second layer lying upon the first.
Ascending again the band passes a third time over the top pulley, the third
layer lying upon the second one. Again descending the band passes aside,
that is, it does not again pass over the bottom pulley, but forms the loose loop
from which the starting of band was described. The band may pass a greater
or less number of times over the pulleys in the manner described, but for
ordinary purposes the arrangement described is sufficient. In order to give
the necessary adhesion between the different layers of the band a small
pressing pulley is fixed to the frame of the upper pulley. By means of a
spring acting on the said pressing pulley the band is pressed
pulley. As the diameter of the outer part of the top. pulley, from which in
raising a weight the band is being drawn off, is virtually greater than that of
the inner part on to which the band is passing, (by the thickness of the
several layers of the band on the top pulley,) it follows that on communicating
one rotation to the top pulley a greater amount of band is drawn off than that
paid on. The result of this differential action is, that the lower pulley is
raised with a force proportionate to the difference between the lengths of band
being drawn off and paid on the outer and inner parts respectively of the said
top pulley. Our pulley may either be worked by hand applied to the loose
loop, or by a sprocket wheel on the axis of the top pulley.
close to the top
by the said George Tangye and. Joseph Jewsbury in the Great Seal
-Patent Office on-the-8th-March-1866.-
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, GEORGE
TANGYE, of Birmingham, in the County of Warwick, Mechanical Engineer,
and JOSEPH JEWSBURY, of Kinver, in the County of Stafford, Machinist, send
greeting.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, GEORGE
TANGYE, of Birmingham, in the County of Warwick, Mechanical Engineer,
and JOSEPH JEWSBURY, of Kinver, in the County of Stafford, Machinist, send
'greeting.

page_text: WHEREAS Her most Excellent Majesty Queen. Victoria, by; Her Letters
Patent, bearing date the Twelfth day of September, in the year of our Lord
One thousand eight hundred and sixty-five, in the twenty-ninth year of Her
reign, did, for Herself, Her heirs, and successors, give and grant unto us, the.
said George Tangye and Joseph Jewsbury, Her special licence that we, the said
George Tangye and Joseph Jewsbury, our executors,. administrators, and,
assigns, or such others as we, the. said George Tangye and Joseph Jewsbury,
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 PULLEYS FOR RAISING
AND LOWERING HEAVY BODIES," upon the condition (amongst others,) that we,
the said George Tangye and Joseph Jewsbury, 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 Invention, and in what manner the same was to be per-
formed, 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 George Tangye, on behalf of myself
and the said Joseph Jewsbury, 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, reference being
had to the Drawing hereunto annexed, and to the letters and figures marked
thereon (that is to say):
Our Invention consists of the arrangements herein-after described of the
parts of a compound pulley and its band, whereby a differential action is ob-
tained and great lifting power secured by the employment of few parts in the
said pulley.
In constructing a pulley according to our Invention we take two single
pulleys of similar diameter mounted in frames in the usual way, one of
the said pulleys to be hooked to a fixed support and the other to the body to be
raised, as in the case of ordinary pulleys. We connect the two pulleys
together in the following manner-We take an endless band and pass it
over the pulleys in this order. Starting at the, ascending side of the top
pulley the band passes over that pulley, then descending passes under the
bottom pulley, ascending a second time it passes a second time over the top
pulley, the second layer of the band lying, upon the first layer: Again de-

page_text: scending the band passes under the lower pulley, the second layer lying upon
the first;' ascending again the band passes a third time over the top pulley,
the third layer lying upon the second one. Again descending the band
passes aside, that is, it does not again pass over the bottom pulley, but forms the
loose loop from which the starting of the band was described. The band may
pass a greater or less number of times over the pulleys in the manner de-
scribed; but' for ordinary purposes the arrangement described is sufficient. In
order to give the necessary adhesion between the different layers of the band
a small pressing pulley is fixed to the frame of the upper pulley. By means
of a spring acting on the said pressing pulley the band is pressed close to the
top pulley. As the diameter of the outer part of the top pulley from which
in raising a weight the band is being drawn off is virtually greater than that
of the inner part on to which the band is passing;-(by the thickness of the
several layers of the band on the top pulley,) it follows that on communicating
one rotation to the top pulley a greater amount of band is drawn off than
that paid on. The result of this differential action is that the lower pulley
is raised with a force proportionate to the difference between the lengths of
band being drawn off 'and paid 'on the outer and inner. parts respectively of
the said top pulley: Our pulley may either be worked by hand applied to
the loose loop, or by a sprocket wheel on the axis of the top pulley.
Having explained the nature of 'our Invention we will proceed to describe
with reference to the accompanying Drawing the manner in which the same
is to be performed.
.
tmni.co
Figure 1 represents in side elevation a compound pulley and its band'
constructed according to our Invention'; Figure 2 is a section of the same,
and Figure 3 is an edge view of the same. The same letters of reference
indicate the same parts in each Figure a, b, are the two pulley's of the same
diameter mounted in the frames 'd; &, in the usual way. The pulleya is
hooked to a fixed support and the other pulley b'to the body to be raised or
lowered. The said single pulleys a, b, are connected together by the endless
band c, the said band being passed over the pulleys in the following order:
Commencing at the part of the band marked d'the said band 'ascends and
passes over the top pulley a, then descending passes under the bottom pulley
6 ascending á second time it passes a second time over the 'top pulley a, the
Second layer of band lying upon the first layer; again descending the band
passes under the lower pulley 'b, the second layer lying upon the first"; "as-
cending again the band 'passes a third time over the top pulley a, the 'third
layer lying upon the second one; again descending the band passes aside
to the part d, from which the starting of the band was described, so as to form

page_text: :
the loose loop d; e. The direction in which the endless band c is passed over.
the pulleys a, b, will be easily traced by referring to the section, Figure 2, the
direction the band takes being indicated by arrows. The endless, band c
may if necessary be passed a greater or lessn umber of times over the pulleys,
than that described and represented, but we have found that the number de-
scribed is sufficient for all ordinary purposes: Upon the upper pulley a is a
small pressing pulley or roller f, the arm carrying the roller turning freely on
the centre. The said roller is of such a size that it passes between the
flanges of the pulley a; and by, means of the spring. g the said pressing roller
is pressed against the band passing over the said pulley. The said band is
thereby forced into close contact with the pulley a, and the necessary adhesion
effected between the different layers of the band. By pulling the side
marked e of the loop the band c will be drawn from off the outer part of the
top pulley a and payed on to the inner part, of the said pulley; the bottom
pulley & carrying the weight will thereby be slowly raised, the loop d, e, length-
ening as the lower pulley is raised. By pulling the other side marked d of
the loop the band will be paid on to the outer part of the top pulley a and
drawn off the inner part of the said pulley, and the lower, pulley 6 carrying
the weight will be lowered, the loop d, e, diminishing in length as the pulley b
descends. As the diameter of the outer part of the top pulley from which
in raising a weight the band is being drawn off is virtually greater than that
of the inner part on to which the band is passing, (by the thickness of the
several layers of band upon the said top pulley,) it follows that on communi-
cating one rotation to the top pulley a greater amount of band is drawn off*
than that paid on. The differential action thus obtained in the band causes
the lower pulley to be raised with a force proportionate to the difference
between the lengths of band drawn off and paid on the outer and inner
parts respectively of the said top pulley. The reverse action takes place
when the weight is to be lowered. Instead of working the pulley by the
O band applied to the loose loop d, e, of the band, as represented in the Drawing
the necessary motion may be given to the top pulley by means of a sprocket
wheel situated on the axis of the said pulley, that is a wheel having a series
of radial forked arms in which a cord lies by which rotation may be given
to the wheel.
5
Having now described the nature of our Invention, and the manner in
which the same is to be performed, we wish it to be understood that we do
not. limit ourselves to the precise details herein described and illustrated,
as the same may be varied without departing from the nature of our
Invention, but we claim as our Invention the improvements in pulleys for

page_text: raising and lowering heavy bodies herein-before described and illustrated in
the accompanying Drawing, that is to say, arranging the parts of a compound.
pulley (consisting of two single pulleys of the same diameter) and its band,
substantially in the manner described and illustrated, whereby on the rotation.
of the top pulley of the compound pulley a differential action is obtained in
the band connecting the two pulleys together, and the weight attached to the
bottom pulley is raised or lowered.
In witness whereof, I, the said George Tangye, have hereunto set my
hand and seal, this Sixth day of March, in the year of our Lord One-
thousand eight hundred and sixty-six.
Witness,
RICHARD-SKERRETT,
Clerk to George Shaw,
Birmingham..
GEORGE TANGYE. (L.S.)