IMPROVE- MENTS IN APPARATUS FOR MULTIPLYING POWER APPLICABLE TO WINDLASSE CRANES, HOISTS, AND OTHER MACHINES
Year: 1872

page_text: LETTERS PATENT to William Horatio Harfield, of Mansion House
Buildings, in the City of London, for the Invention of "IMPROVE-
MENTS IN APPARATUS FOR MULTIPLYING POWER APPLICABLE TO WINDLASSE
CRANES, HOISTS, AND OTHER MACHINES."
Sealed the 29th October 1872, and dated the 23rd August 1872.
PROVISIONAL SPECIFICATION left by the said William Horatio
Harfield at the Office of the Commissioners of Patents, with his
Petition, on the 23rd August 1872.
I, WILLIAM HORATIO HARFIELD, of Mansion House Buildings, in the
City of London, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN APPARATUS FOR MULTIPLYING POWER APPLICABLE TO WIND-
LASSES, CRANES, HOISTS, AND OTHER MACHINES," to be as follows:-
This Invention has for its object improvements in apparatus for
multiplying power applicable to windlasses, cranes, hoists, and other
machines in which the power of a quickly revolving axis is communi-
cated to another axis moving more slowly, but with a proportionately

page_text: greater power.
On the last mentioned axis which I call the "power
axis, I mount two flanged wheels, each fitted with a nipping lever, the
longer arms of which levers bear upon two cams mounted on the quickly
revolving, or as I shall call it the "speed"axis; the cams are of such a
curve that on rotating the "speed" axis, the ends of the two nipping
levers are lifted up alternately and thereby communicato a rotary motion
to the "power" axis. The cams are of such form that this rotary motion
is continuous and uniform.
.
By arranging a series of cams of different lifts on the "speed" axis
and sliding them under the nipping, levers, the power can be easily
varied.
In some description of hoists one flanged wheel only is necessary,
there being two nipping levers fitted to it one above the other, each of
them being acted upon by a cam...
i
:
In windlasses I mount on each of the two flanged wheels two nipping
levers one above the other, one pair (either the upper or the lower) is
driven by lifting cams on the "speed" axis which receives motion from
a steam engine. The other pair I arrange so as to be capable of. being
worked by manual power in such a manner that either pair of levers.
can be worked independently of the other, or they can be worked
together, and when at rest as in riding the strain is divided between the
two pairs.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Horatio Harfield in the Great Seal Patent
Office on the 22nd February 1873.
-TO¯¯ALL-TO WHOM THESE PRÈSENTS SHALL COME, I, WILLIAM-
HORATIO HARFIELD, of Mansion House Buildings, in the City of
-London,-send-greeting...
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-third day of August, in the 3
year of our Lord One thousand eight hundred and seventy-two, in the
thirty-sixth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said William Horatio Harfield," Her special
license that I; tho said William. Horatio Harfield, my executors, adminis....
"

page_text: trators, and assigns, or such others as I, the said William Horatio
Harfield 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 APPARATUS FOR MULTIPLYING POWER APPLICABLE TO WIND-
LASSES, CRANES, HOISTS, AND OTHER MACHINES," upon the condition (amongst
others) that I, the said William Horatio Harfield, my executors or ad-
ministrators, 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 Horatio Harfield, 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 :-
"
This Invention has for its object improvements in apparatus for
multiplying power applicable to windlasses, cranes, hoists, and other
machines in which the power of a quickly revolving axis is communi-
cated to another axis moving more slowly, but with a proportionately
greater power. On the last mentioned axis which I call the "power
axis I mount two flanged wheels each fitted with a nipping lever, the
longer arms of which levers bear upon two cams mounted on the quickly
revolving or as I shall call it the "speed" axis; the cams are of such a
curve that on rotating the "speed" axis, the ends of the two nipping
levers are lifted up alternately and thereby communicate a rotary motion
to the "power" axis. The cams are of such form that this rotary
motion is continuous and uniform.
By arranging a series of cams of different lifts on the " speed" axis
and sliding them under the nipping levers, the power can be easily
varied.
In some descriptions of hoists one flanged wheel only is necessary,
there being two nipping levers fitted to it one above the other, each of

page_text: In windlasses I mount on cach of the two flanged wheels two nipping
levers one above the other, one pair (either the upper or the lower) is
driven by lifting cams on the "speed" axis which receives motion from
a steam engine. The other pair I arrange so as to be capable of being
worked by manual power in such a manner that either pair of levers can
be worked independently of the other, or they can be worked together;
and when at rest as in riding the strain is divided between the two
pairs.
I
Figure 1 represents in elevation, and Figure la in plan a hoist having
two purchase wheels. b, b, placed one on each side of a drum b¹;-a nipping.
lever c is fitted to each purchase wheel, and the longer arms of the 1
levers rest upon cams d, d, keyed on the shaft e. Motion is given to
the shaft e by the crank handles e¹, and on rotating the shaft e the
nipping levers are raised and lowered alternately, and communicate a
rotary motion to the purchase-wheels b, b, and the drum b. The cams
are of such a form that this rotary motion is continuous and uniform. 2
The winding barrels of cranes and other winding barrels may be similarly
driven; or for other purposes, where a slow motion is required to be
obtained, from a rapidly revolving shaft; the object may be attained in
this manner.
In some cases instead of using a smooth wheel and nipping-levers, I 2
use ordinary ratchet wheels having drop pawls, and I actuate the drop
pawl carriers by cams as above described and shewn in Figure 16, which
is an elevation shewing the ratchet wheel 6%, the pawl carrier o³, the
cam A double set of pawl carriers, purchase ratchet wheels, and
cams are used as in the previously described arrangement.and.the.action-3
similar.
By arranging a series of cams of different lifts on the cam shaft, and
sliding-them-under the nipping levers or pawl carriers the power can be
. easily varied. An arrangement for this purpose is shewn in elevation in
Figure 2, and in plan in Figure 2. a-is the shaft. having the drum b¹ 3
and the two purchase wheels b, b, keyed to it. On each of these is fitted
·

page_text: a nipping lever c, which bears on the cams d. It will be seen that
there are several pairs of cams d', d", and a™, of different lifts; and they
can be moved laterally with the shaft e, so that either pair of cams can
be brought under the arms of the nipping levers, and the amount of
motion given to the nipping levers varied accordingly.
When it is required to drive a windlass by a steam engine, the
arrangement I prefer to employ is shewn in elevation in Figure 4, and
in plan in Figure 4. On the windlass shaft a are keyed the two
purchase wheels b, b, and on each of these wheels are fitted the two
nipping levers c and c², one above the other. The lower ones c, c, bear
upon cams d, d, keyed to the crank shaft of the steam engine, the
revolution of which will through the nipping levers and purchase wheels
cause the windlass to revolve. The upper pair of nipping levers c³, c³,
are connected by links to a rocking cross head which can be worked by
the usual manual levers either independently, or they can be worked
together with the steam engine and in aid thereof. When at rest as
when the ship is riding, the strain on the windlass is divided between
-the two pairs of nipping levers.
In some descriptions of hoists I use one purchase wheel only.
Figure 3 is an elevation, and Figure 3º a plan of such an arrangement;
6 is the purchase wheel; cand c¹ are nipping levers placed one above
the other, the longer arm of the upper one c is forked, and that of the
lower one c¹ is single. The lever c³ bears upon a cam fixed to shaft e,
and on each side of this cam is another cam upon which the forked arm
of the upper lever c bears. When the shafte is rotated by the crank.
handles e', e', the two nipping levers alternately rise and fall and cause
the purchase wheel and the drums on the shaft a to revolve.
Having thus described the nature of my Invention of improvements
in apparatus for multiplying power applicable to windlasses, cranes,
hoists, and other machines, and also the way in which I apply my said
Invention, I wish it to be understood that I do not confine myself to
the exact details as described, as the arrangement may be varied, but
what Tolaim is

page_text: 2nd. The arrangement of a steam engine driving a windlass by means
of cams fixed on the crank shaft of the engine, which cams acting upon
levers and purchase wheels revolve the windlass, substantially as
described.
3rd. The combination in a steam windlass of two sets of nipping
levers, substantially as described, one set to be driven by the steam
engine through cams, and the other set to be connected with a rocking
lever to be worked by manual lovers in the ordinary manner.
4th. The arrangement for varying the speed and power of mechanism
by which one axis is driven from another by having several cams of
different lifts on the driving axis and sliding them when necessary under
the longer arms of nipping levers operating on purchase wheels upon the
driving axis, substantially as described.
5th. The combination with a purchase wheel of two nipping levers,
working one above the other on the said purchase wheel, and both
actuated by cams, substantially as described.
In witness whereof, I, the said William Horatio Harfield, have here-
unto set my hand and seal, this Twenty-first day of February,
in the year of our Lord One thousand eight hundred and seventy-
three.