Improvements in Chain-driving Gear for Cycle and other Wheels.
Year: 1896

page_text: Improvements in Chain-driving Gear for Cycle and other Wheels.
PETER MAURICE STAUNTON 18 Herbert Street Dublin Barrister-at-Law, do
hereby declare the nature of this invention to be as follows:-
My invention has for its object the more advantageous mode of applying the
driving power to Cycles and consists in constructing the driving chain and
sprocket wheels so that whilst the cogs on the front sprocket wheel will engage
the links of this chain close to the circumference those on the rear sprocket wheel
may be conveniently lengthened and will be engaged by the chain at or near the
outer ends of such cogs.
For this purpose I construct a chain the links of which will be much similar to
those of the ordinary chain-preferably of the "block" pattern-but with the
upper and front portion of (say) each alternate block or link so shaped as to
engage the lengthened cogs of the rear sprocket wheel at or near to the extremities
of such cogs whilst the rear and inner part of such block or link or of alternate
links will be so shaped as to be engaged by short cogs and close to the circum-
ference of the front sprocket wheel.
In carrying out my invention and in order to allow of an increased length in
the rear sprocket cogs I may construct the links that will engage such cogs of an
arched shape with suitable arrangements at the centre of each such arch for engag-
ing such cogs in which case I would preferably use a chain of the "roller" class.
Dated this 4th day of December 1896.
Improvements in Chain-driving Gear for Cycle and other Wheels.
I, PETER MAURICE STAUNTON 18 Herbert Street Dublin Barrister-at-Law, 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:
My invention relates to improvements in chain driving gear for Cycles, and for
all other wheels that may be driven by such chains as are hereinafter described,
in combination with suitable sprocket wheels, and it consists in constructing the
chains and the sprocket wheels, so that the cogs on the front or driving sprocket
wheel will engage such chain close to the circumference of snch wheel and the
cogs which will be engaged by such chain on the rear or driven sprocket wheel may
be considerably lengthened and will be engaged by such chain at or near the
TD 1

page_text: extremities of such cogs. I now proceed to more fully describe the nature of my
invention and the manner in which the same may be put into practice-with the
assistance of the accompanying sheet of explanatory drawings. Fig. 1 shows one
form of my improved chain in position on the rear or driven sprocket wheel of a
cycle, the sprocket wheel p having cogs c so lengthened as to be engaged at
their ends by the arched links a such links having suitable arrangements at their
centres for the purpose of such engagement. The short cogs h being so made as
to pass freely between the ordinary links b, without being pulled-on by them--such
cogs being for the purpose of keeping the chain in position on the sprocket wheel.
Figs. 2 and 3 show a side view and a plan of the arched links, b, such links are
slightly undercut as shown in Fig. 2 61 for the purpose of enabling the cogs to
freely engage them at the "shoulders" shown in Fig. 3, 62. In Fig. 8, 6 shows
a cog suitable for engaging such links and Fig. 7 is a plan of my chain as shown
in Fig. 1. R, being the arched links, S the ordinary straight links and K the ends
of the connecting rivets. Figs. 4 and 5 are a plan and a side view of other suitable
arched links and in Fig. 8 d and f are cogs for engaging the same, in each case
the rivet holes are shown at m. Fig. 6 is a side view of my arched link made from
weldless steel tubing. The front or driving sprocket wheel would have ordinary
short cogs for engaging the straight links b Fig. 1 only, in a line with the centres
of the connecting rivets. My chain may be made of steel or other suitable
material, the arched links being formed from a single piece of steel or from weld-
less tubing as described. By those means I provide a durable and strong driving
or power transmitting chain which may be readily applied to any suitable sprocket
wheels, and by means of the arched links I procure a modified amount of longi-
tudinal elasticity in such chains. I also enable the "working" cogs on the rear
sprocket wheel to be materially lengthened without altering the relative gearing
of such wheel with the front or driving wheel, and by providing a more direct
contact and a "rocking" engagement between such cogs and arched links I
believe that I considerably reduce the amount of chain friction.
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what I
claim is:
1. The construction and application of driving or power transmitting chains
(for cycle and other suitable sprocket wheels) composed of alternate straight or
ordinarily shaped links and of links arched upwards with suitable arrangements
at the centres of such links for engaging suitable lengthened cogs on the rear
(or driven) sprocket wheel, for the purposes and substantially as described and
illustrated.
2. The construction and application of a sprocket wheel with cogs suitable for
engaging driving chains at or near their extremities, substantially as described
and illustrated.
3. In driving chains for use on cog wheels the provision of a slight elasticity
by means of arched links substantially as described and as illustrated.
4. The improved general construction and arrangement of the parts forming
my improvements in chain driving gear substantially as described and as
illustrated herein.
Dated this 1st day of August 1897.
PETER MAURICE STAUNTON.