Year: 1885

page_text: We JOHN STEELE and ROBERT STEELE of the firm of Edward Steele of
Sunnyside Mills, Lower Seddon Street, Salford, Manchester in the County of
Lancaster, Chain Makers, and JOSEPH LEES of Armley Heights, Leeds in the
County of York, Engineer do hereby declare the nature of this Invention to be
as follows:-
こ
Our said Invention relates to pitch chain gearing and consists chiefly in a novel
form of pitch chain link block whereby the durability and efficient working of the
chain is increased and the tendency to over-ride the teeth of the wheels is obviated.
The improved chain link block is made triangular in form, the base of the triangle
being in line with the chain, while the apex projects on one side of the chain so as
to engage with similarly shaped teeth formed on the wheel. The said similarly
formed triangular teeth enter the triangular spaces between the triangular link
blocks so as to enable the chain to impart motion to or to receive motion from the
wheel. A pitch chain having link blocks of the described form or of a form nearly
approximating thereto and engaging with wheels having similarly formed teeth
will run slack without any tendency to over-ride and will continue to perform its
work efficiently even when the pitch of the links has become altered by wear. In
the act of working, each link block as it enters between the teeth is compelled by
the inclined side of the tooth to assume its correct relative position and cannot
possibly mount upon the top of the tooth. A further advantage derived from the
described form of link block is that it leaves the tooth with considerably less
rubbing contact or friction than is the case with the ordinary chain gearing and
consequently our improved chain gear may be used with less expenditure of
driving power. Owing to the extended superficial contact between the inclined
sides of the link blocks and the teeth of the wheel our improved chain will wear
much longer than the ordinary chain. The inclined sides of the triangularly shaped
links and teeth may be straight or they may be slightly curved. The hereinbefore
described link blocks are united by rivets to side links of the ordinary form so as
to compose a complete chain. Although we prefer to use the triangularly formed
link blocks and toothed wheel as described in conjunction, we may if desired use
the ordinary pitch chain in conjunction with a wheel having triangularly formed
teeth as the said form of teeth will obviate over-riding even when used in
conjunction with the ordinary pitch chain.
. DUTTON & FULTON,
Agents.

page_text: .
Improvements in Pitch Chain Gearing.
We JOHN STEELE and ROBERT STEELE of the firm of Edward Steele of
Sunnyside Mills, Lower Seddon Street, Salford, Manchester in the County of
Lancaster, Chain Makers and JOSEPH LEES of Armley Heights, Leeds in the
County of York, Engineer do hereby declare the nature of this Invention and
in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement and accompanying drawings:-
Our said Invention relates to pitch chain gearing and consists chiefly in
improving the form of the pitch chain link block whereby the durability and
efficient working of the chain is increased and the tendency to over-ride the teeth
of the wheels is obviated. The improved chain link block is made triangular in form
the base of the triangle being in line with the chain while the apex projects on
one side of the chain so as to engage with similarly shaped teeth formed on the
wheel.
Our Invention will be best understood when described with reference to the
accompanying Sheet of drawings wherein Fig. 1 represents an endless pitch chain
made in accordance with our invention connecting two chain wheels. In the said
Fig. a. a. are the improved chain link blocks which are connected together by
means of links b. b. which are made of an ordinary form. One of these blocks a.
is separately represented by Fig. 2 and a few links of the chain are represented in
Fig. 3 the view being on a plane at right angles to Fig. 1. The blocks a. are of a
triangular formation and are drilled or formed with holes through which pass the
pins which connect together the links of the chain. A third hole a¹ is formed in
the block to lighten it but this may be dispensed with. For convenience of pro-
duction we prefer to form the blocks from bar of steel or metal which have been
rolled to the required section and we prefer that the pins shall be fast in the outer
links b. so that they shall have a longer bearing in the blocks a. as in the case
of chains made with inner link blocks previously to our said invention. Fig. 4 is
an enlarged sectional view showing more clearly the manner of connecting the links
and blocks. The block is drilled so as accurately to fit the turned pins c. The
reduced ends of the pins are rivetted to the links and are fast therein so that the
pin turns in the block. As shown in the drawing the turned pin presents a shoulder
at each side of the block which prevents frictional contact between the blocks and
the links and causes the chain to work more easily. The chain wheels D. are formed
with recesses d. of a triangular shape to suit the forms of the blocks. It will be
seen that the blocks a fit into and fill the recessed d. in a portion of the circum-
ferences of each wheel and that the driving wheel will take a firm hold of the
chain. A pitch chain of the indicated formation engaging with wheels formed to
correspond will run slack without any tendency to over-ride and will continue to
perform its work efficiently even when the pitch of the links has become altered
by wear. In the act of working each link block as it enters a recess in the wheel
is compelled by the inclined side of the tooth to assume its correct relative position
and cannot possibly mount upon the top of a tooth between two recesses. A
further advantage derived from the described form of link block is that it leaves

page_text: the wheel with considerably less rubbing contact or friction than is the case with
the ordinary chain gearing and consequently our improved chain gear may be used
with less expenditure of driving power. Owing to the extended superficial contact
between the inclined sides of the link blocks and the teeth of the wheel our
improved chain will wear much longer than the ordinary chain. The inclined sides
of the triangularly shaped links and recesses may be straight or they may be
slightly curved. Although we prefer to use the triangularly formed link blocks
and toothed wheel as described in conjunction we may if desired use the ordinary
pitch chain in conjunction with wheels of the indicated formation as the improved
form of the teeth of such wheels will obviate over-riding even when used in
conjunction with the ordinary pitch chain.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that what
we claim is
1. The pitch chain gearing of the formation substantially as set forth and
indicated herein before and in and by the accompanying drawings.
2. In pitch chains the triangular formation of the blocks which are linked
together to constitute the chain, substantially as set forth and indicated.
3. The pitch chain wheels having triangular recesses d. d. for the purposes set
forth.