IMPROVEMENTS IN APPARATUS FOR RAISING AND LOWERING WEIGHTS
Year: 1869

page_text: LETTERS PATENT to Thomas Moore, of South Stockton-on-Tees, in
the County of York, Engineer, and Charles Arthur Head, of the
Teesdale Iron Works, Stockton-on-Tees, Engineer, for the Inven-
tion of "IMPROVEMENTS IN APPARATUS FOR RAISING AND LOWERING
WEIGHTS."
Sealed the 7th January 1870, and dated the 30th October 1869.
PROVISIONAL SPECIFICATION left by the said Thomas Moore and
Charles Arthur Head at the Office of the Commissioners of Patents,
with their Petition, on the 30th October 1869.
We, THOMAS MOORE, of South Stockton-on-Tees, in the County of
York, Engineer, and CHARLES ARTHUR HEAD, of the Teesdale Iron
Works, Stockton-on-Tees, Engineer, do hereby declare the nature of the
said Invention for "IMPROVEMENTS IN APPARATUS FOR RAISING AND LOWERING
WEIGHTS," to be as follows:-
This Invention has for its object improvements in apparatus for
raising and lowering weights, and relates to improvements on the
apparatus described in the Specification of a former Patent granted to
one of us on the 26th February 1869 (No. 594). In this Specification

page_text: is described the constructing pulley blocks with two lifting chain wheels,
over both of which a lifting chain is led. The two chain wheels were
caused to revolve in opposite directions, and the ends of the two lifting
chains which when the wheels were rotated would travel in the same
direction were both attached to a lifting hook, so that both chains would
assist in raising the hook and weight carried by it.
By our present improvements we still employ two lifting chain wheels,
and we give motion to them by forming one chain wheel with an
internal ring of teeth, into which a pinion of somewhat smaller diameter
and formed with one or more less teeth is caused to gear.
The pinion
is mounted on an eccentric, so that by rotating the eccentric the pinion
can be caused to roll around the internal ring of teeth. The axis of
the eccentric passes through the fixed stud or axis of the chain wheel,
and has another chain wheel fixed upon it, over which an endless chain
is passed, so that by hauling on this chain the eccentric may be
revolved. The pinion is formed with studs or projections on its sido
to enter slots or recesses in a metal plate, and the second chain wheel
is also formed with studs or projections on its side to enter other
recesses in the metal plate, or the second ohain wheel may be otherwise
coupled with the pinion so that it shall revolve with it. By this means
when the eccentric is caused to revolve the lifting chain wheel first
mentioned will be caused to revolve slowly in the same direction, whilst
the pinion and second chain wheel will be revolved slowly in the
opposite direction to the excentric. We prefer that the axis of the
eccentric should pass through the fixed stud or axis of the second
chain wheel; and the fixed studs or axes of both chain wheels we
prefer to carry by the side bars of a rectangular frame, the top bar of
which has a hook attached to it by which the pulley block can bo
suspended.
SPECIFICATION in pursuance of the conditions of the Letters Patent, 30
filed by the said Thomas Moore and Charles Arthur Head in
the Great Seal Patent Office on the 30th April 1870.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, THOMAS
MOORE, of South Stockton-on-Tees, in the County of York, Engineer,
and CHARLES ARTHUR HEAD, of the Teesdale Iron Works, Stockton-on- 35
Tees, Engineer, send greeting.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Thirtieth day of October, in the year
of our Lord One thousand eight hundred and sixty-nine, in the thirty-
third year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said Thomas Moore and Charles Arthur
Head, Her special licence, that we, the said Thomas Moore and Charles
Arthur Head, our executors, administrators, and assigns, or such others
as we, the said Thomas Moore and Charles Arthur Head, our
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 APPARATUS FOR RAISING AND LOWERING WEIGHTS," upon
the condition (amongst others) that we, the said Thomas Moore and
Charles Arthur Head, our executors or administrators, by an instrument
in writing under our or their hands and seals, or under the hand and
seal of one of us or them, 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 we, the said Thomas Moore and Charles
Arthur Head, 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
raising and lowering weights, and relates to improvements on the
apparatus described in the Specification of a former Patent granted to
one of us on the 26th February 1869 (No. 594.)
In this Specification is described the constructing pulley blocks with
two lifting chain wheels, over both of which a lifting chain is led. The
two chain wheels were caused to revolve in opposite directions, and the
ends of the two lifting chains which when the wheels were rotated would
travel in the same direction were both attached to a lifting hook, so
that both chains would assist in raising the book and weight carried by
it. By our present improvements we still employ two lifting chain

page_text: wheels, and we give motion to them by forming one chain wheel with an
internal ring of teeth, into which a pinion of somewhat smaller diameter
and formed with fewer teeth is caused to gear. The pinion is mounted
on an eccentric, so that by rotating the eccentric the pinion can be
caused to roll around the internal ring of teeth and so a slow rotation
is obtained of the one part in relation to the other part. The second
chain wheel is connected with the pinion in such manner that the
pinion (whilst it is left free as regards its rolling motion) can only
rotate by carrying this chain wheel with it. As the weight to be raised
is hung from the two chain wheels, these wheels divide the rotation
equally between them. The axis of the eccentric has a wheel fixed
upon it over which an endless hand chain is passed, and by hauling on
this chain the eccentric may be revolved and the wheels of the lifting
chain rotated.
And in order that our said Invention may be most fully understood
and readily carried into effect we will proceed to describe the Drawings
hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a cross section of a pulley block constructed according to
my Invention. a, a, are two arms connected together by a cross head b
so as to form a frame to which the hook c is attached. The frame
carries in a long bearing the axis d on which is fixed the chain wheel e,
and an endless hand chain passes around this wheel. By means of the
hand chain the axis d can be rotated when desired, and it has formed
upon it the eccentric d'; f is a pinion mounted on the eccentric, and
the eccentric when rotated within it gives to it a rolling motion; g is a
chain wheel mounted on the bearing around the axis d; it is provided
with a ring of internal teeth g', as is more clearly seen at Figure 2,
which is a section taken at the line A, B, Figuro 1, looking towards the
right hand. When the eccentric d' is turned the pinion frolls around
the ring of teeth g³, and as the number of teeth of the one is different
by one tooth (or it might be by more) from that of the other a slow
rotation is obtained; his another chain wheel mounted in the same way
as the chain wheel g, but on the other side of the pinion f with which it
is clutched by the coupling plate i in such manner that the pinion can 3
only rotate by carrying the chain wheel with it. The coupling plate i
is clearly seen at Figure 3, which is a section taken at the line A, B,
Figure 1, looking towards the left hand. The coupling plate i is fitted

page_text: in guides h* in the chain wheel h so that it may be able to slide to and
fro therein, and the pinion f has jaws f* which receive the plate i
between them, but allow the pinion to slide along the plate in a direction
at right angles to that in which the plate i slides in the guides h*.
Figures 4 and 5 show the way in which the chain by which the weight
is raised and lowered is passed around the chain wheels g and h, as is
scen in Figure 4, the hook for the load is connected with the two ends
of the chain which are led over the chain wheels in opposite ways, and
the chain forms a loose bite between the two chain wheels. It results
from this method of arranging the lifting chains that the two chain
wheels g and are caused to divide the rotary motion between them and
to rotate at the same speed in opposite directions. Figure 6 is a cross
section of a similar pulley block, but with the chain wheels and h
mounted on the axis & in place of on the bearings of the frame.
Having thus described the nature of our said Invention, and the
manner of performing the same, we would have it understood that what
we claim is, the construction of pulley blocks for raising and lowering
weights with two chain sheaves or pulleys having the weight to be
lifted suspended between them and capable of being rotated opposite
ways by a pinion which is clutched with one of the chain wheels and can
be caused to roll round within a ring of teeth fixed to the other chain
wheel, substantially as herein described.
In witness whereof, we, the said Thomas Moore and Charles Arthur
Head, have hereunto set our hands and seals, this Twenty-ninth
day of April, in the year of our Lord One thousand eight hundred
and cotanto