CERTAIN IMPROVEMENTS IN PULLEY AND CHAIN' GEARING TO BE EMPLOYED FOR LIPTING OR TRACTION PURPOSES, FOR MOVING FIRE BARS IN FURNACES, OR FOR DRIVING MECHANISM
Year: 1867

page_text: LETTERS PATENT to Thomas Wrigley, of Todmorden, in the County of
Lancaster, Manager, for the Invention of "CERTAIN IMPROVEMENTS IN
PULLEY AND CHAIN' GEARING TO BE EMPLOYED FOR LIPTING OR TRACTION
PURPOSES, FOR MOVING FIRE BARS IN FURNACES, OR FOR DRIVING MECHANISM,"
COMPLETE SPECIFICATION filed by the said Thomas Wrigley at the
Office of the Commissioners of Patents, with his Petition'and Declaration,
on the 15th July 1867, pursuant to the 9th Section of the Patent Law
Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
WRIGLEY, of Todmorden, in the County of Lancaster, Manager, send greeting.
WHEREAS I am in possession of an Invention for "CERTAIN IMPROVE
KENTS IN PULLEY AND CHAIN GEARING TO BE EMPLOYED FOR LIFTING OR TRACTION
PURPOSES, FOR MOVING FIRE BARS IN FURNACES, OR FOR DRIVING MECHANISM," and
have petitioned Her Majesty to grant unto me, my executors, adminis-
trators, and assigns, Her Royal Letters Patent for the same, and have made
solemn Declaration that I am the first and true Inventor thereof.
NOW KNOW YE, that I, the said Thomas Wrigley, do hereby declare
that the following Complete Specification, under my hand and seal, fully
describes and ascertains the nature of the said Invention, and in what manner
the same is to be performed, in and by the following statement and accom-
panying Drawings (that is to say):-

page_text: My Invention relates to a novel description of pulley which in combination
with a chain designed to fit and act with it may be applied to many purposes
where lifting, pulling, the moving of fire-bars in furnaces, or the driving of
machinery are effected by means of chains and pulleys, such as, for example,
the lifting of minerals from mines,or as a pulley block for lifting any weight,
the traction of waggons or carriages, or the working of chain tappets in
looms, or moving an endless chain of fire-bars, and for other purposes where
the pulley is required to take firm hold on the chain to effect its positive and
certain action without slipping.
The improvements consist in so constructing the pulley that the chain shall
have several holds or bearings on the surface thereof, the number of which
may be increased or diminished according to the strength of links or width of
chain, and the weight to be moved, and the construction of such pulley may
either be effected by securing a number of plates together side by side on a
shaft, or casting the pulley from a pattern so made, and the plates may be of
any convenient form, so that they be properly arranged in relation to each
other, that is to say, they may be triangular, square, pentagonal, hexagonal,
heptagonal,octagonal, or polygonal,but for example,and to shew the arrange-
ment and relative position that the angles should bear to the bearing surfaces,
I will take equal sided or square plates, and proportionate chain also as an
example.
And in order that the Invention may be better understood and explained in
detail, I have hereunto attached a Sheet of Drawings illustrative of the same,
and shewn as an example of the Invention as applied to the moving of the
transverse grate bars of a furnace.
Fig. 1 represents an end view of the pulley which contains plates or sur-
faces of two forms, one set a, a, being square for the bearing of the links b, b,
(which are dotted as in position), and the end plate c being octagonal for the
bearing of the bars when applied to the fire-bars of furnaces, because the
width of two bars being equal to the length of one link the bars require more
faces to bear upon than the links; Fig. 2 is a plan view, and Fig. 3 a vertical
section of the pulley taken through the line A, B; and Fig. 4 is an end
elevation shewing the application of the pulley and chain to the transverse
furnace bars as an example; and Fig. 5 is a plan view of the same, which in
this instance shews the pins or studs on the ends of the bars as forming part
of the chain, but in ordinary chains applied to other purposes, the links are
jointed together by pins as usual; Figs. 6 and 7 shew the application of the
endless chains and pulleys to the fire-bars in a furnace.
It will be seen by the Drawings that the plates are so arranged that the

page_text: points or angles of one plate project above the flat surface of the next, and s
on alternately, which is animportant portionof the Invention, as the projecting
points or angles form guides or lateral supports for the links, and the pres-
sure of the chain is dispersed over a greater surface, and presses from several
points arranged around and towards the centre shaft instead of the strain
being in one line from the outermost point diametrically to the centre,
by which improved arrangement the turning of the pulley requires less power,
the friction being more evenly distributed. It will now be evident that the
progress of the chain is effected by the angles of the plates entering the aper-
tures between the joints of the links in combination with the bearing of the
links on the flat surfaces of the pulley, and whatsoever may be attached or
connected with such chain will receive motion and power therefrom.
Having now described the nature of the said Invention, together with the
method of carrying the same into practical effect, I wish it to be distinctly
understood that I claim,-
The employment and useof pulleys constructed as described in combination
with chains as constituting positive or non-slipping gearing for the purpose
of lifting, traction, driving, or other similar uses.
And, secondly, the application and use of fire-bars in furnaces attached
together by endless chains, and moved by such arrangement of pulleys and
links, in which the pins of the links constitute part of the fire-bars as herein-
before described, set forth, and fully illustrated in the Drawings attached.
In witness whereof, I, the said Thomas Wrigley, have hereunto set my
hand and seal, this Eleventh day of July, in the year of our Lord One
thousand eight hundred and sixty-seven.
Witnessed by
JOHN L. DAVIES, C.E.,
Office for Patents,
Manchester.
THOMAS WRIGLEY. (L.B.)