IM- PROVEMENTS IN PULLEY BLOCKS, ALSO APPLICABLE TO HOISTING AND OTHER MACHINERY
Year: 1871

page_text: LETTERS PATENT to Henry Cherry, of 3, Walmer Terrace, Birming-
ham, in the County of Warwickshire, for the Invention of "IM-
PROVEMENTS IN PULLEY BLOCKS, ALSO APPLICABLE TO HOISTING AND OTHER
MACHINERY."
Sealed the 22nd August 1871, and dated tlie 25th March 1871.
PROVISIONAL SPECIFICATION left by the said Henry Cherry at the
Office of the Commissioners of Patents, with his Petition, on the
25th March 1871.
I, HENRY CHERRY, of 3, Walmer Terrace, Birmingham, in the County
of Warwickshire, do hereby declare the nature of the said Invention
for “IMPROVEMEnts in Pulley-BLOCKS, ALSO APPLICABLE TO HOISTING AND OTHER
MACHINERY," to be as follows:-
A chain wheel is mounted on a central pin carried by the frame of
the pulley block, which it is preferred to cast in one piece, and has
a bevil wheel having internal teeth, cast or otherwise, secured to it.
Into the bevil wheel a bevil pinion gears having a less number of
teeth. The pinion is carried by an eccentric boss or pin on a wheel,
hercin-after termed the hand wheel worked by means of a rope, chain,

page_text: toothed wheel, or other means. The axis of the boss or eccentric pin
is inclined to that of the central pin and intersects it. The central pin
passes through the hand wheel which turns on or is secured to it. The
pinion has an arm cast or otherwise secured to it, having a pivot or
enlargement in a line drawn perpendicularly to the axis of the eccentric
boss or pin from its point of intersection with the axis of the main or
central pin. The pivot or enlargement works in a slot in the frame and
the pinion is thus prevented from turning. On causing the hand wheel
to revolve the chain wheel will be caused to rotate at a speed varying
with the difference between the number of teeth in the bevil wheel and
pinion.
The arrangement may be varied by securing the pinion to the chain
wheel and carrying the bevil wheel on the eccentric boss or pin. Again
the eccentric boss or pin may be carried by a sleeve on the central pin
caused to revolve by means of a wheel or handle which may be placed
outside the frame; or again the boss may form part of the central or
main pin.
To
Instead of the arm on the pinion carrying a pivot it may have a slot
formed in it working on a pivot or projection secured to the frame.
cause the motion to be conveyed uniformly, which is desirable, it is
however necessary that the point on which the arm pivots should be
in a line perpendicular to the axis of the eccentric boss or pin drawn
from the point of intersection of that and the axis of the central or
main pin.
That the Invention as described is applicable to lifting jacks, crabs,
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Henry Cherry in the Great Seal Patent Office
on the 6th September 1871.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY 30
CHERRY, of 3, Walmer Terrace, Birmingham, in the County of War-
wickshire, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-fifth day of March, in the

page_text: year of our Lord One thousand eight hundred and seventy-one, in the
thirty-fourth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Henry Cherry, Her special licence
that I, the said Henry Cherry, my executors, administrators, and
assigns, or such others as I, the said Henry Cherry, 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 Ircland, the
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
PULLEY BLOCKS, ALSO APPLICABLE TO HOISTING AND OTHER MACHINERY," upon
the condition (amongst others) that I, the said Henry Cherry, 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 Henry Cherry, do hereby declare
the nature of my said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by
the following statement :—
The improved pulley block is constructed as follows:-A chain wheel
is mounted on a central pin carried by the frame of the pulley block,
which it is preferred to cast in one piece, and has a bevil wheel having
internal teeth cast or otherwise secured to it; into the bevil wheel
a bevel pinion gears having a less number of teeth. The pinion is
carried by an eccentric boss or pin on a wheel, herein-after termed
the hand wheel, worked by means of a rope, chain, toothed wheel, or
other means, the axis of the boss or eccentric pin is inclined to that
of the central pin and intersects it. The central pin passes through
the hand wheel which turns on or is secured to it. The pinion has an
arm cast or otherwise secured to it, having a pivot or enlargement in
a line drawn perpendicularly to the axis of the eccentric boss or pin
from its point of intersection with the axis of the main or central pin,
the pivot or enlargement works in a slot in the frame, and the pinion
is thus prevented from turning. On causing the hand wheel to revolve
the chain wheel will be caused to rotate at a speed varying with

page_text: མ Pསཔ} DIUvY
Const Reted according to
this Invention; 2 is a longitudinal section, Figure 3, an end clevation, a
Figure 4, a plan; Figure 1 is a face view of the pinion.
(A) is the chain wheel mounted on the central pin (B); a chain (C)
passes over it having a hook at each end, to either of which the load
may be attached. The chain is prevented from slipping by snugs or
projections formed on the chain wheel in the usual way. (D) is the
frame; (E) is the bevil wheel cast on the chain wheel (A). The bevil
pinion (F) gears into the bevil wheel (E) and has one tooth less; (G)
is the hand wheel having the eccentric boss or pin (H) cast on it. The
hand wheel (G) is worked by means of the endless chain (I) passing
over it. (J) is an arm cast on the pinion working in a slot or hole (K)
in the side of the frame. At the end of (J) is a pivot or enlargement
having its centre in the line (a, b,) drawn perpendicularly to the centre
line (c, b,) of the eccentric boss or pin (H). at its point of intersection (6)
with the axis (d, b,) of the central or main pin (B). On the hand
wheel (G) being rotated the eccentric boss or pin (H) gives the pinion
(F) a motion which cause its teeth to gear successively into the bevil

page_text: wheel (E). The pinion (F) being prevented from rotating by the
arm (J) and having a tooth less than the bevil wheel (E) the latter
advances one tooth for each revolution of the hand wheel (G). The
chain wheel (A) thus receives a slow motion relative to that of the
hand wheel (G) and a comparatively small pull on the hand chain (I)
will raise a large weight attached to the chain (G). The number of
teeth in the pinion may differ from that in the wheel by any number
greater than one. The pivot of the arm (J) may be made in some
cases to work in a slot in a brake or ratchet wheel for convenience in
lowering rapidly.
In the modification in which the pinion is attached to the chain wheel
and the bevil wheel carried by the eccentric boss, the bevil wheel must
have the arm cast or otherwise secured to it.
In applying my Invention to lifting jacks, crabs, and hoisting
machinery I substitute for the chain wheel (A) a toothed pinion or
other convenient means of transmitting the required motion.
What I claim as my Invention is the combination of the bevil
wheel (E) and pinion (F), arm (J) and eccentric (boss or pin) (B),
substantially as and for the purposes herein-before described.
In witness whereof, I, the said Henry Cherry, have hereunto set
my hand and seal, this Second day of September, in the year
of our Lord One thousand eight hundred and seventy-one.