IMPROVEMENTS IN AND APPERTAIN- ING TO BLOCKS FOR LIFTING AND LOWERING WEIGHTS
Year: 1877

page_text: LETTERS PATENT to William Oime Carter, of Liverpool, in the County of
Lancaster, Merchant, for the Invention of "IMPROVEMENTS IN AND APPERTAIN-
ING TO BLOCKS FOR LIFTING AND LOWERING WEIGHTS"
Sealed the 31st July 1877, and dated the 8th February 1877
PROVISIONAL SPECIFICATION left by the said William Orme Carter at the
Office of the Commissioners of Patents on the Sth February 1877
WILLIAM ORME CARTER, of Liverpool, in the County of Lancaster, Meichant
'IMPROVEMENTS IN AND APPERTAINING TO BLOCKS FOR LIFTING AND LOWERING
WEIGHTS"
"
My Invention relates to certain improvements in blocks for hoisting and lowering
weights, and has for its object certain improvements upon blocks constructed upon
the worm and wheel principle, where the worm wheel is in connection with the
drum or hoisting wheel, and the woim is in connection with the pulley through
which motion is transmitted
My Invention consists in constructing the worm wheel in duplex parts, having
the drum or hoisting wheel, being the load wheel, in the centre between and con-
necting the duplex worm wheels The worm or screw which dives and genis into
the duplex worm wheel is placed with its axis at right angles to such worin wheel
The driving pulley being a Vo chain pulley is carried on the same axis as the
screw worm, and is operated by an endless chain or ope The parts are mounted
in a suitable frame provided with a shackle or hook
My Invention further consists in the application of a flat wire band or flat chain
being the hoisting medium
I am aware that hoisting blocks have before been made with a tangent screw
carried upon the axis of the rope or chain pulley, gearing into a worm wheel on the
axis of the hoisting or load wheel, but these blocks have been made with the
hoisting or load wheel at one side of and overhanging the worm wheel, thereby
constituting a one-sided anangement, and throwing the load outside of the worm
wheel My Invention however essentially consists of the introduction of the duplex
worm wheel having the hoisting or load drum in the centre between the duplex
wheels By this arrangement I am enabled to get a more compact and mechanical
Din 71

page_text: block
The strain being thrown direct in the centre of the block enables the parts
to be considerably reduced in weight and size
By the use of the flat wire band or chain I am enabled to wrap such band or
chain 1ound the load dium and between the duplex worm wheel, and thus obtain a
greater amount of lift than could be arrived at by the use of a 1ope or ordinary
chain
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Orme Carter in the Great Seal Patent Office on the 7th
August 1877
WILLIAM ORME CARTER, of Liverpool, in the County of Lancaster, Merchant
"IMPROVEMENTS IN AND APPERTAINING TO BLOCKS FOR LIFTING AND LOWERING
WEIGHTS
"
My Invention relates to certain improvements in blocks for hoisting and lowering
weights, and has for its object certain improvements upon blocks constructed upon
the worm and wheel punciple, where the worm wheel is in connection with the
drum or hoisting wheel, and the worm is in connection with the pulley, through
which motion is transmitted
My Invention consists in constructing the worm wheel in duplex parts, having
the dium oi hoisting wheel, being the load wheel, in the centre, between and con-
necting the duplex woim wheels The worm or screw which drives and gears into
the duplex worm wheel is placed with its axis at right angles to such worm wheel
The diving pulley being a V or chain pulley is carried on the same axis as the
screw worm, and is operated by an endless chain or 10pe The parts are mounted
in a suitable frame provided with a shackle or hook
My Invention further consists in the application of a flat wuo band or flat chain
being the hoisting medium
I am aware that hoisting blocks have before been made with a tangent sciew
carried upon the axis of the rope or chain pulley, gearing into a worm wheel on the
axis of the hoisting or load wheel, but these blocks have been made with the
hoisting or load wheel at one side of and overhanging the worm wheel, thereby
constituting a one-sided arrangement, and throwing the load outside of the worm
wheel My Invention however essentially consists of the introduction of the duplex
worm wheel having the hoisting or load dium in the centre between the duplex
wheels By this arrangement I am enabled to get a more compact and mechanical
block The strain being thrown direct in the centre of the block enables the parts
to be considerably reduced in weight and size
By the use of the flat wie band or chain I am enabled to wrap such band or
chain 1ound the load drum and between the duplex worm wheel, and thus obtain
a greater amount of lift than could be arrived at by the use of a rope or ordinary
chain
The beforegoing being the nature, object, and purposes of my Invention I will
now proceed to describe more in detail how the same may be carried out in
practical effect, and for that purpose I have hereunto attached a Sheet of Drawings
illustrative thereof, where like letters are used to denote like parts throughout the
views
Figure 1 is a side elevation of a block constructed according to my Invention,
Figure 2 is an end view of same
Upon reference it will be seen that my Invention consists in constructing the
worm wheel A in duplex parts, having the drum or hoisting wheel B (being the
load wheel) in the centre, between and connecting the duplex parts of the worm
wheel A The worm or sciew C which dives and gears into the duplex worm
wheel A is placed with its axis at right angles to the axis of the worm wheel A.

page_text: The driving pulley D is carried on the same axis as the worm or screw C, and 13
operated by an endless chain or rope E The parts are inounted in a suitable
frame F, provided with a shackle or hook G
My Invention further consists in the application of a flat wne band or flat chain H
being the hoisting medium, and which winds on the drum B between the duplex
woim wheel A. The band or chain H is provided with a book or shackle J
In operation the worm C is actuated by the chain E and the pulley D The
worm C actuates the duplex worm wheel A, which winds the flat band or chain II
on the drum B, the weight to be lifted being suspended by the hook J
Having now described and ascertained the nature, object, and purpose of my
Invention, and shown how the same may be carried out into practical effect, I
would have it understood that I do not confine myself to the dimensions or par-
ticular design of the hoisting block shown in the Drawings, as it is evident the
same may be considerably altered without departing from my Invention, but
what I claim as my Invention, and secured to me by Letters Patent as aforesaid
19,-
Firstly The duplex worm wheel A with the intermediate drum B in connection
with a scrow or woim, such as C, operated by a chain E and pulley D, and
operating a flat band or chain, such as H, substantially as herein-before described
and set forth
Secondly The mode of lifting and lowering weights by a screw or worm which
actuates a duplex woim wheel, the load or weight being taken on a dium between
or in the centre of the duplex worm wheel, so that the strain is thrown direct in
the centre of the block, as bei ein-before described and set forth
Thirdly The application to blocks for lifting and lowering weights of a flat wire
band, such as H, which takes on to and winds or unwinds round a drum, which is
carried by a duplex worn wheel, worked by a suitable screw or worm pulley and
endless chain, as herein-before described and set forth
In witness whereof, I, the said William Orme Carter, have hereunto set my
hand and seal, this Fourth day of August, in the year of our Loid One
thousand eight hundred and seventy-seven
NAMWA