An Improved Block for Hoisting and analogous Uses.
Year: 1894

page_text: Date of Application, 10th Jan., 1894
Complete Specification Left, 10th Oct., 1894-Accepted, 5th Jan., 1895
PROVISIONAL SPECIFICATION.
An Improved Block for Hoisting and analogous Uses.
I, ANNIE CARR of 137 Bramall Lane, Sheffield Yorkshire, Engineer, do
hereby declare the nature of the said invention to be as follows:-
This invention relates to an improved block for lifting, lowering or moving
weights and for analogous uses, which may be used, as a hand driven block, or as a
power driven block as in a crane a hoist where a single or a donble chain is
required, and may be geared up in like manner as a Weston block or as a Pickering
block where a single or double chain is required.
In the improved block the chain or chains works or work in a grooved pulley
cut out or formed in such a manner as to receive and act as a bed to each link of
the chain, to prevent the same from slipping.
The chain or chains works or work just sufficiently close under a worm to clear
the same, but so that the worm will press the chain or chains down in its or their
bed should it or they tend to override the pulley, the worm also tending to prevent
the chain or chains from slipping out of its or their place or respective places when
loaded. The chain wheel is formed in one with a worm wheel which engages with
said worm, the worm shaft working in a frame which supports the block and also
the weight required to be hoisted or otherwise dealt with; the worm wheel turning
on a pin passing through and supported by the lower part of said frame. Just
above the worm, said frame is formed or provided with a strong oval-like top
which covers the worm and is of a formation suitable for hooking up or suspending
the block.
One end of the worm shaft runs against a hardened centre or tail pin, the other
end thereof is fitted with a driving pulley which is so grooved or cut out as to suit
either an endless chain, or a rope for hand power, for turning the aforesaid pulley
for raising or lowering the weight being dealt. with.
The apparatus is also adapted with a swing-guide having two small pulleys
grooved or cut out in like manner to the driving pulley, the guide being so adapted
that when a pull is applied at the one side of the pulley for raising purposes, the
guide always maintains the same lap of chain or rope in the bed of the grooved
pulley.
Dated this 5th day of January 1894
COMPLETE SPECIFICATION.
An Improved Block for Hoisting and analogous Uses.
I, ANNIE CARR, of 137 Bramall Lane, Sheffield, Yorkshire, Engineer, 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 :-
This invention relates to an improved pulley-block for lifting, lowering or moving

page_text: weights and for analogous uses, and which may be used as a hand-driven block, or
as a power-driven block as in a crane or hoist where a single or a double chain is
required, and may be geared up in like manner as a Weston block or as a Pickering
block where a single or double chain is required.
The improved block (vide the accompanying drawings) may be made with a snatch
block as a half-chain pulley block, or with a single lift chain and two hooks.
On the accompanying drawings, Figs. 1 and 2, represent sectional elevations at
right angles to each other.
In the improved pulley-block, the chain (or chains) a, works in a grooved sheave,
pulley or chain-wheel b, which is cut out or formed in such a manner, as at c, as to
receive and act as a bed to each link of the chain a, to prevent the same from
slipping. The chain works just sufficiently close under a worm d, to clear the
same, the arrangement being such as to cause the worm to press the chain down in
its bed should it tend to override the pulley, and to prevent the chain from slipping
or jerking out of its place when loaded, causing it to work steadily and freely.
The chain wheel 6, is formed in one with a worm wheel e, which engages with
the worm d, the shaft f, of which works in a frame g, which is formed with a strong
oval-like top h, which covers the worm and is adapted with a book i, for suspending
the whole.
Ball bearings n, for reducing the friction, may advantageously be arranged
between the inner end of the worm shaft f, and the adjacent end of the frame g, or
a hardened centre or tail pin with which the frame may be fitted for such end of
the shaft to bear against.
The other end of the frame is fitted in with a bush 9', after the worm d, is
inserted, and the same end of the shaft f, is fitted with a driving pulley k, the
periphery of which may be grooved or cut to suit either an endless chain or a rope l,
whereby the pulley k. is caused, through the worm d, and worm-wheel e, to actuate
the chain wheel b, so as to effect the raising or lowering of the weight being dealt
with, as required.
The pulley-block is also adapted with a swinging frame m, centred on the shaft f,
and which may be fitted with two small pulleys m', which also may be grooved or
cut to suit the chain or rope l, which is passed around the pulleys so as to cross
(Fig. 2,) so that when a pull is applied at either side of the pulley the guide m, m³,
will always maintain the same lap of the chain or rope l, in the bed of the
pulley k.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a worm-wheel pulley block, the arrangement of the actuating worm directly
over the groove of the sheave, pulley or wheel wherein the hoisting or lowering
chain works, in such a manner as just to clear the chain when in normal working,
and as to prevent the same from slipping or jerking out of its bed and from
overriding the sheave or wheel.
2. The arrangement of worm wheel pulley-block hereinbefore described with
reference to the accompanying drawing.
Dated this 10th day of October 1894.
DAY, DAVIES & HUNT,
321, High Holborn, London, W.C., Agents for the Applicant.