AN IMPROVED ADJUSTABLE OR FAST AND LOOSE PULLEY
Year: 1874

page_text: LETTERS PATENT to William Robert Lake, of the Firm of Haseltine,
Lake, & Co., Patent. Agents, Southampton Buildings, London,
for the Invention of "AN IMPROVED ADJUSTABLE OR FAST AND LOOSE
PULLEY." -A communication from abroad by Edwin F. Allen, of
Providence, Rhode Island, United States of America.
Sealed the 2nd June 1874, and dated the 7th January 1874.
PROVISIONAL SPECIFICATION left by the said William Robert Lake
at the Office of the Commissioners of Patents, with his Petition,
on the 7th January 1874.
I, WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co.,
Patent Agents, Southampton Buildings, London, do hereby declare the
nature of the said Invention for "AN IMPROVED ADJUSTABLE OR FAST AND
LOOSE PULLEY," a communication, to be as follows :―
The said Invention relates to an improved adjustable pulley or wheel,
and consists in the combination of a friction spring, a griping bar, a
shipper sleeve which has a taper bar and disc with a pulley which has

page_text: an inner and outer rim in such a manner that by the movement of the
said shipper sleeve the inner rim of the said pulley is compressed by the
friction spring and holds it firmly, so that the disc to which the friction
spring is inseparably attached is caused to revolve with the said pulley
and impart the required motion to the machinery or apparatus with
which it is connected. The said pulley has a suitable hub or boss
properly fitted to turn upon the shaft which the pulley is to drive. The
aforesaid friction spring is attached to the disc by a screw or screw bolt,
the spring being thickened at its point of attachment to give it sufficient
strength for the reception of the said screw or bolt. At the opposite
side of the axis of the disc the extremities of the said spring extend
through an opening in the said disc.
The aforesaid griping bars are held in place by a screw, and are
supported by a plate. A spiral spring attached to the bars assists to
keep them in place and yet allows them the necessary freedom of move-
ment. I provide an adjusting bolt with check nuts to compensate for
the wearing of the said bars.
A feather or long key is extended through the aforesaid disc and
shipper sleeve to prevent their turning independently of the shaft. An
opening is made in the disc near the shaft for the introduction of the
aforesaid taper bar to separate the griping bars.
SPECIFICATION in pursuance of the conditions of the Letters Paentt,
filed by the said William Robert Lake in the Great Seal Patent
Office on the 6th July 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London, send greeting.
c
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Seventh day of January, in the year of
our Lord One thousand eight hundred and seventy-four, in the thirty-
seventh year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said William Robert Lake, Her special
licence that I, the said William Robert Lake, my executors, adminis-

page_text: trators, and assigns, or such others as I, the said William Robert Lake,
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
AN IMPROVED ADJUSTABLE OR FAST AND LOOSE PULLEY," a communication
to me from abroad by Edwin F. Allen, of Providence, Rhode Island,
United States of America, upon the condition (amongst others) that
I, the said William Robert Lake, 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

page_text: yet bring them back to their original position after the taper bar is
withdrawn. The screws L hold the upper part of the griping bars on
the disc but not so firmly as to prevent the moving of the two arms of
the griping bar when the lower parts are separated by the insertion of
the taper bar. By means of this device the two ends of the friction
spring which penetrate the opening in the disc D are compressed by the
upper part of the gripping bars as they are brought together. N is the
opening under the shaft through which the taper bar is forced when
the friction power is sought. The circular opening near N between the
griping bars F, F, represents the place through which the shaft goes.
O is an opening in the disc through which the two ends of the friction
spring E project to operate on the other side in conjunction with the
griping bars. The taper bar is forced by the movement of the shipper
sleeve through the opening O.
The mode of operating this improved friction pulley is as follows:-
Suppose the pulley to be revolving loosely upon the shaft the inner rim
not being compressed by the friction spring and the power not being
used which is necessary for mechanical use, it is desired to make the
pulley available in moving other machinery, the shipper sleeve is
moved by the ordinary shipper arm and this presses the taper bar M
through the opening N in the disc. In passing this opening the taper
bar presses aside the adjusting bolt I; this movement forces asunder
the lower parts of the griping bars F. As the griping bars are separated
the upper ends approach each other; by this approach they press the
projecting ends of the friction spring E together as they appear through
the opening in the disc. This compression of the ends of the friction
spring, which is circular and flexible, causes it to firmly grasp the inner
rim of the pulley, which is also circular and next to it. As the pulley
therefore revolves after such compression it causes the revolution of the
disc and of all the machinery attached thereto. By a single motion of
the shipper sleeve this result is accomplished.
Having thus fully described the nature of the said Invention, as com-
municated to me by my foreign correspondent, and the manner of
performing the same, I wish it understood that I claim,—
First. The disc D having attached to and connected with it the
friction spring E which forms a part of the said disc.

page_text: Second. The disc D having attached to and connected with it the
friction spring E which forms a part of the said disc D in combination
with the griping bars F, or their equivalent, operating together as
described and for the purposes specified.
Third. The combination of the disc D having the friction spring E
attached to, connected with, and forming a part of the same, with the
griping bars F, the shipper sleeve G, and taper bar M, and a pulley
having an outer and an inner rim or equivalent contrivances, operating
together as described and for the purposes spécified.
In witness whereof, I, the said William Robert Lake, have here-
unto set my hand and seal, this Fourth day of July, in the year
of our Lord One thousand eight hundred and seventy-four.
Witness,
H. J. NOONE,
8, Southampton Buildings,
London.
W. ROB. LAKE. (L.S.)