Improvements in Machinery for Lifting and Lowering Heavy Bodies.
Year: 1889

page_text: Date of Application, 22nd Jan., 1889
Complete Specification Left, 3rd Oct., 1889-Accepted. 9th Nov., 1889
PROVISIONAL SPECIFICATION.
Improvements in Machinery for Lifting and Lowering Heavy
Bodies.
We TANGYES Limited of Cornwall Works Soho in the County of Stafford
Engineers and JAMES RICHARD WILLIAMS of Station Road Handsworth in the County
of Stafford Mechanical Engineer, do hereby declare the nature of this Invention to be
as follows:-
The said invention has reference to machinery for lifting and lowering heavy
bodies of the kinds commonly called pulleys hoists and crabs and is especially
applicable to the lifting and lowering machinery described and claimed in the
specification of Letters Patent granted to Henry Cherry of Aston near Birmingham
in the County of Warwick dated the 27th of August 1875 No. 3023.
The improvements constituting the said invention are also applicable generally to
such pulleys hoists and crabs as have dynamic brakes operating upon the brako
wheel.
We will describe the said invention in connection with the patented invention
referred to commonly called the "Cherry block." Instead of employing as is usual only
one lifting chain wheel and allowing one end of the lifting chain to remain idle we
employ two lifting chain wheels placed preferably side by side the one working in the
ordinary way. The lifting chain after passing in the usual way over one of the said
wheels passes downwards and is threaded or passed round an ordinary gin block
carrying the hook to which the load is suspended. The chain ascending is connected
by its end to the outer end of the dynamic brake strap. The other or ille end of the
lifting chain is passed over the second or additional lifting chain wheel described
but instead of allowing this end of the chain to hang vertically as usual it is passed
over a roller under the second or additional chain wheel the said roller being attached
to the dynamic brake strap in such a position as to cause the said brake strap to
operate upon the brake wheel in the ordinary way. This end of the chain is provided
with a hook to which a load may ha suspended. In the working of the machinery
the said hook travels at a rate double that at which the hook of the gin block travels
and can be conveniently employed for lifting lighter loads than those for which the
hook of the gin block is employed.
By the improvements described the machine can be used at pleasure either for
raising or lowering slowly a heavy load or for raising or lowering at double speed a
light load without any change of gearing. Or it can be used for raising or lowering
simultaneously a heavy and a light load. Direct single chain lifting machines can be
worked without the gin block described.
D
T
1003
W. T. WHITEMAN.
Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Machinery for Lifting and Lowering Heavy
Bodies.
We TANGYES Limited of Cornwall Works Soho in the County of Stafford
Engineers and JAMES RICHARD WILLIAMS of Station Road Handsworth in the County
of Stafford Mechanical Engineer do hereby declare the nature of the said invention
and in what manner the same is to be performed to be particularly descrihed
and ascertained in and by the following statement :—
The said invention has reference to machinery for lifting and lowering heavy bodies

page_text: of the kinds commonly called pulley blocks, hoists and crabs and is especially applicable
to the lifting and lowering machinery described and claimed in the specification of
Letters Patent granted to Henry Cherry of Aston near Birmingham in the County
of Warwick dated the 27th of August 1875 No. 3023.
The improvements constituting the said invention are also applicable generally
to such pulley blocks hoists and crabs as have dynamic brakes operating upon the
brake wheel.
We will describe the said invention in connection with the patented invention
referred to commonly called the "Cherry block." Instead of employing as is usual
only one lifting chain wheel and allowing one end of the lifting chain to remain
idle we employ two lifting chain wheels placed preferably side by side, the one
working in the ordinary way. The lifting chain after passing in the usual way
over one of the said wheels passes downwards and is threaded or passed round an
ordinary gin block carrying the hook to which the load is suspended. The chain
ascending is connected by its end to the outer end of the dynamic brake strap.
The other or idle end of the lifting chain is passed over the second or additional
lifting chain wheel described but instead of allowing this end of the chain to hang
vertically as usual it is passed over a roller under the second or additional chain
wheel the said roller being attached to the dynamic brake strap in such a position
as to cause the said brake strap to operate upon the brake wheel in the ordinary
way. This end of the chain is provided with a hook to which a load may be
suspended. In the working of the machinery the said hook travels at a rate double
that at which the hook of the gin block travels and can be conveniently employed for
lifting lighter loads than those for which the hook of the gin block is employed.
By the improvements described the machine can be used at pleasure either for
raising or lowering slowly a heavy load or for raising or lowering at double speed a
light load without any change of gearing. Or it can be used for raising or lowering
simultaneously a heavy and a light load. Direct single chain lifting machines can be
worked without the gin block described.
Figure 1 of the accompanying Drawing represents in vertical section partly in
front elevation and Figure 2 in side elevation a self sustaining pulley block of the
kind called a "Cherry block" for lifting and lowering heavy loads with which said
block the improvements constituting this invention are combined. With the said
block is also combined a dynamic brake operated by the load but brakes of other kinds
may be combined with the said invention. The same letters of reference indicate the
sanie parts in both Figures of the Drawing.
a is the axis of the pulley block carrying side by side and preferably cast in one
piece the two lifting chain wheels and a the wheel being the ordinary lifting chain
wheel and the wheel e the additional or supplementary lifting chain wheel which we
employ. Rotation is given to the lifting chain wheels and c from the ordinary hand
chain wheel & worked by the endless hand chain e by the pinion f on the axis of the
said hand chain wheel d gearing with the internally toothed wheel g keyed on the
axis a of the lifting chain wheels and c; h is the dynamic brake strap_around
the periphery of the fixed brake wheel i carried by the framing of the block. The said
brake strap carries the depending arm upon which the lifting chains supporting
the loads to be raised or lowered act for putting the brake into operation for sustaining
the loads as hereinafter described. The dynamic brake strap is taken out of action
when required by pulling down the spring lever & through the link and hand
lever m.
The lever k carries near its centre a snug n which acts upon the snug p
on the brake strap h so that as the rope end of the hand lever m descends the
snug n acting upon the snug p takes the brake strap h out of action in the ordinary
way.
7'
Under the additional or supplementary lifting chain wheel c is a roller 2
the axis of
which is carried by the depending arm 2 of the dynamic brake strap /
is the loop
of the lifting chain in which the ordinary gin block is supported and to which gin
block a heavy load may be hooked and is the second or idle loop of the lifting chain

page_text: to the hanging end t of which a weight u and hook æ are attached. On the hook x a
light weight may be hooked.
The way in which the lifting chain is arranged upon the pulley block to produce the
two loops rands and the depending end t to which the weight u and hook are
attached is as follows:
-
Commencing with the end of the chain connected at to the horizontal part of the
arm h of the dynamic brake the said chain descends forming a loop in which the
gin block is supported. The chain then ascends and passes over the outer or
ordinary lifting chain wheel band again descending it forms an idle loop s. Ascending
a second time the end of the chain passes over the second or additional lifting chain
wheel c and is deflected to the side of the block from which the chain started by
the roller under the said chain wheel c and hangs down, the depending part
of the chain being marked and carrying the weight u and hook . The chain
is prevented from working off the lifting chain wheels and c by the fixed
stops y, y
To the gin block a heavy load is hooked and to the hook on the hanging
chain & a light load may be hooked the said hook a travelling at a rate double that at
which the hook of the gin block travels in consequence of the length of chain payed
out to the gin block loop being divided between the fixed half of the chain and the
moveable half of the chain forming the loop.
It will be seen by an examination of Figure 2 that the loads on the hooks of
the gin block and the hanging chain press the arm ³ of the dynamic brake h
in the same direction so that the loads are self sustained by operating the said
dynamic brake.
It will be understood that the pulley block can be used either for raising or lowering
a heavy load by hooking it to the gin block or for raising or lowering a lighter
load at double the speed by placing it on the hook without any change of
gearing; or the pulley block may be used for raising or lowering simultaneously
a heavy and light load by hooking the said loads to the gin block 7² and hook."
respectively.
In a direct single chain raising machine the gin block may be omitted.
Although we have described and represented the improvements in connection
with a Cherry block having a dynamic brake yet the said improvements are also
applicable to other pulley blocks and to hoists and crabs having dynamic and
other kinds of brakes for making the raising and lowering machine self sustaining.
Having now particularly described and ascertained the nature of the said inven-
tion and the manner in which the same is to be performed we declare that we
claim as the said invention of "Improvements in machinery for lifting and lowering
heavy bodies" :-
First-The combination with pulley blocks hoists and crabs having dynamic or
other brakes for sustaining the load or loads of two lifting chain wheels placed
preferably side by side and a roller placed under the second or additional lifting
chain wheel for deflecting the end of the lifting chain after it has passed over
both the chain wheels and formed the idle loop with a hanging end to which end
a weight and hook are attached whereby the idle end of the lifting chain of the
lifting and lowering machinery is utilized and the said machinery may be used at
pleasure either for raising or lowering slowly a heavy load or for raising or lowering
at double speed a light load or for raising or lowering simultaneously a heavy and
light load substantially as herein before described and illustrated in the accompanying
Drawing.
Secondly Combining the roller by which the hanging end of the idle loop of
the raising chain is deflected with the dynamic or other brake of the machinery

page_text: so as to cause the load carried by the said hanging end of the idle loop to operate
the said brake substantially as herein before described and illustrated in the accom-
panying Drawing.
Dated the Thirtieth day of September 1889
TANGYES LIMITED,
W. T. Parkins,
Secretary.
JAMES RICHARD WILLIAMS.