Ix. PROVEMENTS IN PULLEY BLOCKS
Year: 1873

page_text: LETTERS PATENT to George Spencer, of the City of Manchester, in
the County of Lancaster, Engineer, for the Invention of "Ix.
PROVEMENTS IN PULLEY BLOCKS."
Scaled the 9th September 1873, and dated tho 12th March 1873.
PROVISIONAL SPECIFICATION left by the said George Spencer at the
Office of the Commissioners of Patents, with his Petition, on the
12th March 1873.
I, GEORGE SPENCER, of the City of Manchester, in the County of
Lancaster, Engineer, do hereby declaro the nature of the said Invention
for "IMPROVEMENTS IN PULLEY BLOCKS," to be as follows:-
-
This Invention relates to those descriptions of pulley blocks in which
are used chains having the ends of their lines in contact with snugs in
the interiors of the rims or flanges of the pulloys.
The improvements consist in casting or fixing teeth in the periphery
of each groove of the pulley between the snugs, and using chains having
links of such length or pitch that the interiors of the links can gear
with the teeth, and at the same time allow the ends of the links to be in
contact with the snugs, and thus as thero aro several links of the chain
always in gear with some of the teeth there is no possibility of any

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Spencer in the Great Seal Patent Office on
the 12th September 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
SPENCER, of the City of Manchester, in the County of Lancaster,
Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twelfth day of March, in the year of 1
our Lord One thousand eight hundred and seventy-three, in the thirty-
sixth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said George Spencer, Her special license that
I, the said George Spencer, my executors, administrators, and assigns, or
such others as I, the said George Spencer, my 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, usc, exercise, and vend, within the
United Kingdom of Great Britain and Ireland, the Channel Islands,
and Isle of Man, an Invention for "IMPROVEMENTS IN PULLEY BLOCKS," upon
the condition (amongst others) that I, the said George Spencer, my
executors or administrators, by an instrument in writing under my, or
their, or one of their hands and seals, 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.
1
NOW KNOW YE, that I, the said Georgo Spencer, do hereby declaro
the nature of my said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by
the following statement, reference being had to the Figures on the
accompanying Sheet of Drawings, and to the letters of reference marked
thereon (that is to say) :-
:-
•
This Invention relates to those descriptions of pulley blocks in which
are used chains having the ends of their links in contact with snugs in

page_text: The improvements consist in casting or fixing teeth in the periphery
of cach groove of the pulley between the snugs, and using chains having
links of such length or pitch that the interiors of alternate links can
gear with the teeth, and at the same time allow the ends of the links to
be in contact with the snugs, and thus as there are several links of the
chains always in gear with some of the tooth thero is no possibility of
any slipping of the chain, and the numerous accidents and losses which
at present occur will bo provented.
On the accompanying Sheet of Drawings Fig. 1 is a view of one side,
Fig. 2, a transverse section, and Fig. 3, a view of the other side of one
of my improved pulley blocks, and Fig. 4 is a plan of part of the same,
Figs. 1 and 3 being partly external and partly sectional.
In the various Figures a represents the ordinary snugs of tho pulleys,
b, the additional teeth between the snugs, and c, portions of the chain;
and it will be seen that the interior of every other link gears with tho
additional tecth, the other links passing through the ordinary grooves in
the usual manner, and these additional teeth are added to pulloys of any
desired diameters and numbers or series of grooves.
. Having now described the nature and particulars of my said Invention,
I desiro it to be understood that in pulley blocks I claim the additional
teeth between the ordinary snugs and the employment of chains having
links of such length or pitch that the interiors of alternato links can
gear with the tooth, as such improvements are herein described and
illustrated on the accompanying Sheet of Drawings.
In witness whereof, I, the said Goorgo Spencer, have hereunto set
my hand and scal, this Eleventh day of September, in the
year of our Lord One thousand eight hundred and seventy-three.
Signed, sealed, and delivered
by the within-named George
Spencer in the presence of
G. SEPTIMUS HUGHES,
Patent Agent,
Manchester.
GEORGE SPENCER. (L.s.)