IMPROVEMENTS IN HYDRAULIC APPARATUS FOR RAISING, HAULING, LOWERING WEIGHTS, APPLICABLE ALSO FOR OTHER WINDING APPA- BATUS
Year: 1871

page_text: LETTERS PATENT to John Henry Harrison, of No. 3, Bridge Place,
Lower Bridge Street, in the City of Chester, Engineer, for the Inven-
tion of "IMPROVEMENTS IN HYDRAULIC APPARATUS FOR RAISING, HAULING,
PROVISIONAL SPECIFICATION left by the said John Henry Harrison
at the Office of the Commissioners of Patents, with his Petition,
on the 12th December 1871.
I, JOHN HENRY HARRISON, of No. 3, Bridge Place, Lower Bridge
Street, in the City of Chester, Engineer, do hereby declare the nature of
the said Invention for "IMPROVEMENTS IN HYDRAULIC APPARATUS FOR RAISING,
HAULING, AND LOWERING WEIGHTS, APPLICABLE ALSO FOR OTHER WINDING APPA-
BATUS," to be as follows:-
In hydraulic apparatus for raising, hauling, and lowering weights, I
employ a winding drum having wound around it in a spiral or helix, both

page_text: a lifting or hauling chain and also another chain actuated by the ram of
au hydraulic cylinder in a similar manner to that described in a Specifi-
cation lodged by Bryan Johnson and Edward Bayzand Ellington, on the
2nd day of March 1870 (No. 614), and in order that both the chains as
they pass on to and off the drum may always be at right angles to its axis,
I mount the drum upon a fixed axle on which a screw thread is cut corre-
sponding to the helix or spiral of the ropes or chains on the drum. The
drum works as a nut upon the axle, and its motion along it compensates
for the winding and unwinding of the helix or spiral.
The drum is made of larger diameter where the lifting or hauling
chain is wound around it than at the part where it has wound around it
the chain which is worked by the hydraulic ram, and one chain is wound
on to the drum at the same time that the other chain is unwound
from it.
The arrangement above described for mounting a winding drum is
applicable in other winding apparatus where a winding drum is used, and
where it is desirable that the rope or chain, which is to be wound around
it, should always be led on to the drum at the same place notwithstanding
that it is wound on to the drum in a helix or spiral.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Henry Harrison in the Great Seal Patent
Office on the 12th June 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN HENRY
HARRISON, of No. 3, Bridge Place, Lower Bridge Street, in the City of
Chester, Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twelfth day of December, in the year
of our Lord One thousand eight hundred and seventy-one, in the thirty-
fifth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said John Henry Harrison, Her special licence
that I, the said John Henry Harrison, my executors, administrators, and

page_text: assigns, or such others as I, the said John Henry Harrison, 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
HYDRAULIC APPARATUS FOR RAISING, HAULING, AND LOWERING WEIGHTS, APPLICABLE
ALSO FOR OTHER WINDING APPARATUS," upon the condition (amongst others)
that I, the said John Henry Harrison, 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
NOW KNOW YE, that I, the said John Henry Harrison, 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 :—
In hydraulic apparatus for raising, hauling, and lowering weights, I
employ a winding drum having wound around it in a spiral or helix, both
a lifting or hauling chain and also another chain actuated by the ram of
an hydraulic cylinder in a similar manner to that described in a Specifi-
cation lodged by Bryan Johnson and Edward Bayzand Ellington, on the
2nd day of March, 1870 (No. 614), and in order that both the chains as
they pass on to and off the drum may always be at right angles to its
axis, I mount the drum upon a fixed axle on which a screw thread is cut
corresponding to the helix or spiral of the ropes or chains on the drum.
The drum works as a nut upon the axle, and its motion along it compen-
sates for the winding and unwinding of the helix or spiral.
The drum is made of larger diameter where the lifting or hauling chain
is wound around it than at the part where it has wound around it the
chain which is worked by the hydraulic ram, and one chain is wound
on to the drum at the same time that the other chain is unwound
from it.

page_text: The arrangement above described for mounting a winding drum is
applicable in other winding apparatus where a winding drum is used, and
where it is desirable that the rope or chain, which is to be wound around
it, should always be led on to the drum at the same place notwithstanding
that it is wound on to the drum in a helix or spiral.
And in order that my Invention may be fully understood and readily
carried into effect, I have at Figures 1, 2, and 3 of the Drawings hereunto
annexed shewn three arrangements of hydraulic apparatus for raising,
hauling, and lowering weights arranged according to my Invention. In
each of these Figures the same letters of reference are used to denote
like parts.
A, A', are two barrels fixed together and revolving on a fixed axle B;
around the barrel A. is wound a chain C, which in each of the arrange-
ments shewn in the Drawings can be acted on by hydraulic apparatus to
give a rotary motion to the barrel upon its axle B; around the barrel A',
which is of larger diameter than the barrel A, is a lifting or hauling
chain D, which will be wound up on to this barrel as the chain C is un-
wound from the barrel A, but which will be wound up at a greater speed
according to the relative diameters of the two barrels. On the axle B is
cut a screw thread of the same pitch as the helix or spiral of the coil of
chain upon the barrel A. At the centre of the drums A, A¹, is fixed or
formed a nut tapped to suit the screw thread on the axle. When the
chain C is by means of the hydraulic apparatus unwound from its barrel,
the barrel revolves, and at the same time traverses along the axle a
distance equal to the breadth of one lap of the chain C, so that the chain
C always leaves the barrel at right angles to the axle. Tho chain D will
also be wound up on to the barrel A' in a helix or spiral corresponding
to the pitch of the screw thread on the axle.
In each of the Drawings, Figures 1, 2, and 3, is shewn a different
arrangement of pulleys and hydraulic apparatus for giving motion to the
chain C; all of the arrangements are however similar to those described
in the Specification before mentioned, and their construction is clearly
shewn in the Drawing, so that it is unnecessary to give here any de-
scription of them.
Having thus described the nature of my Invention and the manner of
0

page_text: myself to the precise arrangements of apparatus shewn in the Drawings
annexed, as other arrangements of apparatus for giving motion to the
chain C from an hydraulic cylinder and ram, or from a steam or air
cylinder might be employed; but I claim in apparatus for raising, hauling,
and lowering weights in which a differential winding drum is used,
having around it a lifting or hauling chain, and another chain for
revolving such drum or controlling its revolution, the mounting such
drum upon an axle on which a screw thread is cut to correspond with the
helix or spiral of the chains wound thereon, substantially as described.
I also claim the combined arrangements of apparatus for raising,
hauling, and lowering weights substantially as described.
In witness whereof, I, the said John Henry Harrison, have here-
unto set my hand and seal, this Tenth day of June, in the year of
our Lord One thousand eight hundred and seventy-two.
Witness,
JOHN HENRY HARRISON. (L.S.)
RICHARD MOUNTFORD DEELEY,
Clerk to Messrs. Johnson & Ellington,
Chester.