IMPROVED PITCH CHAINS
Year: 1884

page_text: I FRANCIS LEY--Barrow on Trent-Derbyshire-Mechanical Engineer-do
hereby declare the nature of my invention for "IMPROVED PITCH CHAINS
"to be
as follows:-
This invention has for its object improved pitch chains and is especially applicable
to chains for tricycles and other machines exposed to dirt and grit.
My improved pitch chain is composed of double links which are alternately as
follows:-
One type of link which I will call the interior link is composed of two side bars
similar the one to the other and each provided at both ends with two bossos, one on
the outer and the other on the inner side of the bar. In each case the boss on-the
inner side of the bar is cylindrical and that on the outer side is conical. At the
common centre of these bosses a hole is drilled right through from side to side to
receive the pin or rivet by which the parts of the link are held together and by
which it is connected with the adjacent link.
The other alternate links which I term the exterior links are also each composed
of two bars and each bar has a boss at either end but on the inner side only of the
bar. In each of these bosses a conical cavity is formed adapted to receive the
corresponding boss on the exterior of the side bar of the next link. The bar also
is perforated in the centre of the conical cavity to receive the common rivet or pin
by which the parts of the two adjacent links are held together and coupled as parts
of a chain.
Two cylindrical pieces are used in building up the chain in addition to the parts
already mentioned. They are adapted to receive within them the cylindrical bosses
of the interior links.
The arrangement of the parts in the chain is as follows:-The two side bars of
the interior link are brought together, their bosses are inserted into the cylinders
and in the middle of the cylinders they abut together. Then the two side bars of
the exterior link are applied and the rivet or pin is inserted passing through the
whole, viz, through the two side bars of the interior link and the two side bars of
the exterior link; by clenching or closing over the end of the pin the joint is
completed.
It will be observed that in this chain the rivets are not exposed to a shearing
strain that the contact of the teeth upon the driving and driven wheels is with
rolling parts namely the cylinders mentioned above and that the wearing parts are
of large area.
Dated this 16th day of Febru

page_text: "
I, FRANCIS LEY of Barrow on Trent Derbyshire-Mechanical Engineer-do
hereby declare the nature of my invention for "IMPROVED PITCH CHAINS and
in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement :-
This invention has for its object improved pitch chains, and is especially applicable s
to chains for tricycles and other machines exposed to dirt and grit.
My improved pitch chain is composed of double links which are alternately as
follows:-
One type of link which I will call the interior link, is composed of two side bars
similar the one to the other, and each provided at both ends with two bosses, one
on the outer and the other on the inner side of the bar. In each case the boss on
the inner side of the bar is cylindrical and that on the outer side is conical. At the
-common contro of these bosses a hole is drilled right through from side to side to
receive the pin or rivet by which the parts of the link are held together, and by
which it is connected with the adjacent link.
The other alternate links which I term the exterior links are also each composed
of two bars and each bar has a boss at either end, but on the inner side only of the
bar. In each of these bosses a conical cavity is formed adapted to receive the
corresponding boss on the exterior of the side bar of the next link. The bar also
is perforated in the centre of the conical cavity to receive the common rivet or pin
by which the parts of the two adjacent links are held together and coupled as parts
of a chain.
Two cylindrical pieces are used in building up the chain in addition to the parts
already mentioned. They are adapted to receive within them the cylindrical bosses
of the interior links.
The arrangement of the parts in the chain is as follows:-The two side bars of
the interior link are brought together, their bosses are inserted into the cylinders
and in the middle of the cylinders they abut together. Then the two side bars of
the exterior link are applied and the rivet or pin is inserted passing through the
whole-viz through the two side bars of the interior link and the two side bars of
the exterior link; by clenching or closing over the end of the pin the joint is
completed.
It will be observed that in this chain the rivets are not exposed to a shearing
strain, that the contact of the teeth upon the driving and driven wheels is with
rolling parts namely the cylinders mentioned above and that the wearing parts
are of large area.
In order that my said invention may be most fully understood and readily carried
into effect I will proceed to describe the drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a plan. Figure 2 a side view and Figure 3 a section of a chain made
in accordance with the invention.
AA are the side bars of the interior link, a¹ is the inner cylindrical boss thercon
and a² is the conical boss on the outer side.
B. B. are the side bars of the exterior link with cavities b¹ on the inner side to
receive the conical bosses a² of the interior link. cc are the cylindrical pieces
surrounding the bosses a¹ and d d are the pins or rivets which hold the parts
together.

page_text: The form of the parts admits of some variation:-thus, Figure 4 is a plan-
Figure 5 a section and Figure 6 a side view of a portion of a chain in which the
bosses a have cylindrical parts as well as conical parts and the cone does nob
penetrate quite to the bottom of the cavity b¹ to leave room for tightening the rivets
after wear.
Figures 7, 8, and 9 show a similar chain but with the exterior links B slightly
modified in form without at all changing the mechanical action of the parts.
Figures 10, 11 and 12 show a chain in which the arrangement of the conical
bosses and corresponding cavities is simply reversed; the conical boss being on the
exterior link and the cavity in the outer boss of the interior link.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
1. A pitch chain built up of interior links and exterior links arranged alternately
each interior link consisting of two bars with bosses at either end those on the inner
side with cylindrical and on the outer side with conical surfaces; each exterior link
also consisting of two bars each with a boss at either end on the inner side and
fitting the corresponding boss of the interior link; the chain also being completed
with pins or nuts and cylindrical pieces surrounding the inner bosses of the interior
links substantially as described.
2. The improved pitch chains horein described and represented by the annexed
drawings.