Im- PROVEMENTS IN THE MEANS OF CONNECTING DRUMS OR PULLEYS WITH THEIR SHAFTS OR DRIVERS
Year: 1865

page_text: LETTERS PATENT to William Clark, of 53, Chancery Lane, in the County
of Middlesex, Engineer and Patent Agent, for the Invention of "Im-
PROVEMENTS IN THE MEANS OF CONNECTING DRUMS OR PULLEYS WITH THEIR
SHAFTS OR DRIVERS."-A communication from abroad by Leverett Homer
Olmsted, of Stamford, Fairfield County, State of Connecticut, United
States of America.
Sealed the 17th April 1866, and dated the 14th November 1865.
PROVISIONAL SPECIFICATION left by the said William Clark at the Office
of the Commissioners of Patents, with his Petition, on the 14th November
1865.
I, WILLIAM CLARK, of 53, Chancery Lane, in the County of Middlesex,
Engineer and Patent Agent, do hereby declare the nature of the said Inven-
tion for "IMPROVEMENTS IN THE MEANS OF CONNECTING DRUMS OR PULLEYS WITH
THEIR SHAFTS OR DRIVERS," to be as follows:-
I construct the drum or pulley A with a secondary wheel B cast on its
arms, the outside of which is accurately turned, as is also the inner side of the
rim of the first pulley. Between these two faces is a cam block C, which is
of a peculiar shape, constructed in such a way that it will bite or jam between
the rims before mentioned when the coupling D is slipped upon the shaft by
the shipper; this result is obtained by means of a wedge E (which is made
of steel and hardened) passing through an aperture in the arm H, the straight

page_text: side of the wedge being against the side of the aperture, and the front or
tapering side against the screw G (which is also made of steel and hardened)
and passes through the lever F, which is fastened rigidly to the cam block C, and
is used for adjusting the cam block, for it will be readily seen that by turning
the screw G in or out the friction between the cam block and the rims of the
pulleys will be increased or diminished. When the wedge E is pushed into
place the screw G is resting upon a straight plane parallel with the back of
the wedge, thereby rendering it impossible for the wedge to work itself out of
place when the shaft is in motion if the cam block is properly adjusted, which
can be done by turning the screw G out or in. In making pulleys for heavy
machinery I extend the arm H across the pulley and put in another cam
block, using two wedges; in this way the pulley can be made to clutch the
shaft as rigidly as if keyed on. This friction clutch pulley is adapted to
engine lathes of all sizes, whether large or small, or for starting heavy
machinery without a sudden shock, or jar, or to communicate motion to any
machine which requires frequent starting or stopping.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Clark, in the Great Seal Patent Office, ou the 7th
May 1866.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
CLARK, of 53, Chancery Lane, in the County of Middlesex, Engineer and
Patent Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fourteenth day of November, 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 me, the
said William Clark, Her special licence that I, the said William Clark, my
executors, administrators, and assigns, or such others as I, the said William
Clark, 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, 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
MEANS OF CONNECTING DRUMS OR PULLEYS WITH THEIR SHAPTS OR DRIVERS," a
communication to me from abroad by Leverett Homer Olmsted, of Stamford,
Fairfield County, State of Connecticut, United States of America, upon

page_text: the condition (amongst others) that I, the said William Clark, my executors
or administrators, 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 William Clark, do hereby declare
the nature of the said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement, reference being had to the Sheet of Drawings hereunto annexed,
and to the letters and figures marked thereon (that is to say) :-
:-
I construct the drum or pulley A with a secondary wheel or rim B cast on
its arms, the outside of which is accurately turned, as is also the inner side of
the rim of the first pulley. Between these two faces is a cam block C which
is of a peculiar shape, constructed in such a way that it will bite or jam
between the rims before mentioned when the coupling D is slipped upon the
shaft by the shipper; this result is obtained by means of the wedge E (which
is made of steel and hardened) passing through an aperture in the arm H,
the straight side of the wedge bearing against the side of the aperture, and
the front or tapering side against the screw G (which is also made of
steel and hardened, and passes through the lever F, which is fastened
rigidly to the cam block C and is used for adjusting the cam block, for
it will readily be seen that by turning the screw G in or out the friction
between the cam block and the rims of the pulleys will be increased or dimi-
nished). When the wedge E is pushed into place, the screw G is resting
upon a straight plane parallel with the back of the wedge, thereby rendering
it impossible for the wedge to work itself out of place when the shaft is in
motion if the cam block is properly adjusted, which can be done by turning
the screw G out or in. In making pulleys for heavy machinery I extend the
arm H across the pulley and put in another cam block, using two wedges,
in this way the pulley can be made to clutch the shaft as rigidly as if keyed
on. This friction clutch pulley is adapted for engine lathes of all sizes,
whether large or small, or for starting heavy machinery without a sudden
shock or jar, or to communicate motion to any machine which requires
frequent starting and stopping.
Having described the nature of this Invention, and the manner of per-
orming the same, I declare that what I claim as the Invention to be pro-
tected by the herein-before in part recited Letters Patent is,-

page_text: First, the combination of the pulley A and friction block C of a friction
clutch for the purpose set forth.
Secondly, the combination of the friction block C, lever F, and wedge E
of a friction clutch, substantially as and for the purpose described.
In witness whereof, I, the said William Clark, have hereunto set my
hand and seal, this Seventh day of May, in the year of our Lord
One thousand eight hundred and sixty-six.
Witness,
JAMES DAISH,
53, Chancery Lane,
London.