AN IMPROVED HOISTING APPARATUS
Year: 1852

page_text: LETTERS PATENT to Jacob Tilton Slade, of Pall Mall, in the
County of Middlesex, Gentlenian, for the Invention of "AN
IMPROVED HOISTING APPARATUS,"
PROVISIONAL SPECIFICATION left by the said Jacob Tilton
Slade at the Office of the Commissioners of Patents, with his
Petition, on the 20th October 1852.
1, JACOB TILTON SLADE, do hereby declare the nature of the said
Invention for "AN IMPROVED HOISTING APPARATUS" to be as follows:-
Weighty materials may be raised by my improved apparatus in one
vehicle by means of one or more men descending in another vehicle
attached to the former by a rope or chain passing over a fixed pulley
or pulleys, one end of which is united to one vehicle and the opposite
end to the other vehicle. In case the chain or rope breaks, these
improvements prevent the vehicles falling to the ground.
In the accompanying Drawing A, represents a framing; B, a
pulley; C, a rope or chain; D, two vehicles; E, a side view of part
of the frame and apparatus attached to one side of the--vehicle for

page_text: preventing its fall in case the rope or chain breaks; f, f, are levers to
which the chain is attached; 9, 9, are springs acting upon the levers
by the cords h, h, in such a manner that, if the chain should break,
diaw the outer ends of the levers down, which causes the opposite
ends to bind against the frame so as to prevent the vehicle falling.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Jacob Tilton Slade in the Great Seal Patent
Office, on the 18th April 1853
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
JACOB TILTON SLADE, of Pall Mall, in the County of Middlesex,
Gentleman, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twentieth day of October, in the year
of our Lord One thousand eight hundred and fifty-two, in the sixteenth
year of Her reign, did, for Herself, Hér heirs and successors, give and
grant unto me, the said Jacob Tilton Slade, Her especial licence that
I, the said Jacob Tilton Slade, my executors, administrators, and
assigns, or such others as 1, the said Jacob Tilton Slade, 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, exercisc, and
vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "AN, IMPROVED
HOISTING APPARATUS," upon the condition (amongst others) that I,, the
said Jacob Tilton Slade, by an instrument in writing under my hand
and seal, 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 Scal Patent Office within
six calendar months next and immediately after the date of the said
Letters Patent.
NOW KNOW YE, that I, the said Jacob Tilton Slade, do hereby
declare the nature of my said Invention, and in what manner the same

page_text: is to be performed, to be particularly described and ascertained in and
by: the following statement, that is to say.:
My Invention relates to a 'mode of arranging hoisting apparatus so
that, in the ovent of the chain of rope (which supports the weight))
breaking, any sudden descent of the stage or.. vehical carrying the
weight may be avoided; and I arrange such apparatus in pairs so tha>
the weight, say, of one or more men descending. on one stage or other
apparatus used as the hoisting vehicle, may, by such stage being
attached to one end of the loisting chain or rope; act as a counter-
balance to the weight suspended to and being raised by the other end
of such chain or rope.
In order that the Invention may be fully understood I will 'proceed
to describe the means pursued by me.
DESCRIPTION OF THE DRAWING.
Figure 1, shows a side view, and Figure 2. an edge view of appa->
ratus, according to the Invention, for raising and lowering persons.or
other weights, and suitable for. the vertical shafts of mines, or as 'the
hoisting apparatus of mills or other places where hoisting apparatus
is required: a, a, are the stages or other vehicles for receiving the
persons or other weights to be raised or lowered. These stages, it will
be seen, are suspended, by each end of the rope, or it may be a chain 6,
which passes around the drum or pulley c, affixed to the axis e, and,
the required alternate rotary motion may be given to this axis e. for
raising and lowering the stages by a steam engine or other suitable
power. The stages a, have each a door a', and are guided in their
ascending and descending motion by projecting" picces a², attached
thereto, partially embracing, the upright parts of the framing ff..
9, 9, are levers turning upon axes h, firmly affixed to the stages a.
The longer arms of these levers have a tendency to be borne down-
wards by reason of the 1ods i, i, attached thereto, and to the springs j,
by which the shorter arms of the levers y, will be borne against the
uprights ff, with a force proportioned to the strength of the springs j,
(which may be varied); the rods extend upwards, and by means of
ropes or chains, are attached to the supporting chain b, and, when so

page_text: attached, the weight of the stages a, is sufficient to overcome the
pressure of the springs j, and the stages ascend or descend without any
pressure being exerted by the shorter ends of the levers g, g. In the
event of the chain or rope b, breaking, the springs j, of the stage,
supported by the broken end of the chain or rope, will act to draw
lown the longer arms of the levers g, with their shorter ends tight
against the uprights f, f, where they will act as breaks to retard the
downward progress of the stage. 1, is a break, and m, a rope attached
thereto to check the motion of the axis e, when required. In the
Drawing the stage A, is shewn with its levers g, free of the framing f;
and the stage B, is shown with its levers g, acting against the framing
f, as would be the case when that end of the rope or chain b, to which
the stage B, was attached is broken.
Having thus described the nature of my said Invention, and the
manner in which I carry the same into effect, I would have it under-
stood that I do not confine myself to the precise details herein shewn
and described. But what I claim is, the mode of arranging and
combining apparatus for hoisting, as herein described.
In witness whereof, I, the said Jacob Tilton Slade, have hereunto
set my hand and seal, this Eighteenth day of April, in the year
of our Lord One thousand eight hundred and fifty-three.
Witness,
WILLIAM BROOKES,
Patont Agent,
73, Chancery Lane..
J. T. SLADE. (L.S.)