IMPROVEMENTS IN GEAR to be as OR APPARATUS, SUITABLE FOR HOISTING, LOWERING AND THE LIKE follows:-
Year: 1884

page_text: I THOMAS SUDRON of Castle Street Works, Hull, in the county of York, Engineer
do hereby declare the nature of the said invention for "IMPROVEMENTS IN GEAR
to be as
OR APPARATUS, SUITABLE FOR HOISTING, LOWERING AND THE LIKE
follows:-
"
This invention is designed to obtain rapid movement, but at the same time can
be instantly stopped and a suspended load will safely hang without fear of slipping
-unless the whole apparatus gave way.
The gear is applicable to winches, cranes, hoists, warehouse cranes, etc where
power is obtainable.
A revolving shaft carries a pinion which gears with a wheel upon a screw or
screwshaft, the latter carrying a traversing nut suitably guided and which carries
one or more pulleys. Upon the framework of the apparatus or other secure support
is secured a bracket carrying one or more pulleys to match those upon the traversing
nut, and a chain or rope is rove round these pulleys as many times as may be
necessary. One end of this is secured to the framework or other safe support and
the other carries the hook or other device by which the goods to be moved are
held.
The revolving shaft being set in motion, the screw is turned and moves the nut
nearer to or farther from the fixed pulleys thus letting out or drawing in the chain
at an increased speed over that of the traversing nut, according to the turns of the
chain round the pulleys, as will be well understood. Clutch reversing gear may be
employed upon the revolving shaft, and there may be as many sets of screws and
nuts and attachments as desired or circumstances permit.
1001

page_text: "
I THOMAS SUDRON of Castle Street Works, Hull, in the county of York, Engineer,
do hereby declare the nature of this invention for "IMPROVEMENTS IN GEAR OR
APPARATUS SUITABLE FOR HOISTING LOWERING AND THE LIKE and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement:-
This invention is designed to obtain rapid movement but, at the same time can be
instantly stopped and a suspended load will safely hang without fear of slipping-
unless the whole apparatus gave way.
The gear is applicable to winches, cranes, hoists warehouse cranes &* wherd power
is obtainable.
A revolving shaft carries a pinion which gears with a wheel upon a screw or
screwshaft, the latter carrying a traversing and suitably guided and which carries
one or more pulleys. Upon the framework of the apparatus or other secure support
is secured a bracket carrying one or more pulleys to match those upon the traversing
nut, and a chain or rope is rove round these pulleys as many times as may be
necessary. One end of this is secured to the framework or other safe support and
the other carries the hook or other device by which the goods to be moved are
held.
The revolving shaft being set in motion, the screw is turned and moves the nut
nearer to or further from the fixed pulleys thus letting out or drawing in the chain
at an increased speed over that of the traversing nut, according to the turns of the
chain round the pulleys, as will be well understood. Clutch reversing gear may be
employed upon the revolving shaft, and there may be as many sets of screws and
nuts and attachments as desired or circumstances permit.
In the accompanying drawings Figure 1 is a side elevation of a simple form of
this apparatus Figure 2 is a like view of an apparatus suitable for use in ships and
Figure 3 is a plan of Figure 2. Like letters of reference represent like parts. A is
the framing B the driving shaft of the engine or other source of power C being the
engine crank or disc, belt pulley or the like. D is the ordinary wheel reversing
gear where such is preferred. E is a pinion revolving with or in the opposite
direction to the driving shaft according as the reversing gear is employed or not.
F is a spur wheel upon the screw G, or its shaft: H is the traversing nut which
carries one or more pulleys I round which the chain or rope J passes, as well as
round the fixed pulley or pulleys K. One end of the chain is attached to the
framework or other secure holding or to the nut H or pulley shell I, and the chain
then passes round the pulleys I, K, the free end carrying the weight. L are guides
of any suitable description for the nut H to work in
As the screw G which can revolve but has no longitudinal traverse, is revolved
the nut H and pulleys I are moved further from or nearer to the fixed pulleys K
and the free end of the chain which carries the weight is shortened or lengthened,
the relative proportion of the two movements being determined by the number
of times the chain is carried round the pulleys I and K.
The apparatus may be stopped with the nut H in any position and consequently
the weight at any height, and the pitch of the screw being sufficiently quick the
nut cannot turn it and consequently the nut (and weight) remains where it was
when the apparatus stopped.
The principal involved in the forms shewn in Figures 2 and 3 is the same as that
in Figure 1, but the details are altered to suit the special purpose for which it is
designed in this instance for use on board ships. The lettering being the same no
difficulty will be experienced in understanding these figures.

page_text: It is of course evident that very considerable modifications of the design of the
apparatus may be made (and in many cases must of necessity be made to meet the
requirements of special situations or demands) without in any way departing from
the spirit of the invention.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I wish it to be under-
stood that I am aware that the method of raising weights by chains rove round two
sets of pulleys one fixed and the other moveable is not new, and has been adopted in
steam and hydraulic cranes for example and I therefore make no broad claim to
that arrangement of pulleys and chains; but what I do claim is:-In an apparatus
for raising or lowering by means of a chain or equivalent rove round one fixed
pulley or pulleys and one moveable pully or pulleys, the combination with the
moveable pulley or pulleys of the traversing nut H and screw G for the purpose
specified.
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