Year: 1885

page_text: I HENRY MAGUIRE HOLDEN, of Saint Bartholomew's Vicarage, Bowling, Brad-
ford, in the county of York, Clerk in Holy Orders do hereby declare the nature of
this invention to be as follows:-
My invention relates to improvements in that class of gearing in which one
wheel actuates a second wheel by means of an endless chain, which engages in the
teeth or projections of both wheels, and in improvements whereby the relative
speeds of the two wheels can be altered or inter-changed.
To carry out my invention I employ an enlarging chain or chains for one or both
wheels, formed of suitably shaped links, which fit between the teeth of each wheel
and which chains are of the requisite length to pass once round the wheel and the
ends of which chains meet closely together. These ends are held in position by
flat springs rivetted to each side of the chain and which fit into radial recesses
formed in the sides of the wheel, whereby the wheel is clasped by the springs
which are provided at their ends with hooks or projections. Other flat springs are
fixed at intervals to the sides of the chain and project towards the centre, and lie
flat to the sides of the wheels for the purpose of securing the chains upon the
wheels laterally.
These enlarging chains may be formed of any necessary thickness, according to
the diameter they are required to add to the wheel upon which they are placed,
and upon their periphery or outer surface the required number of teeth are formed
with which teeth the driving chain engages.
One or both of the wheels geared together may be fitted with the enlarging
chains and these chains may be removed from one wheel to another by means of a
hook or other suitable device actuated by a hand lever, which hook when actuated
catches one end of the chain while revolving and releases it from the wheel upon
which it is clasped, and suitable guide rods, wires or channels are provided along
which the chain then passes to the other wheel upon which it clasps itself
automatically while revolving by means of the springs hereinbefore mentioned.
Dated the 17th dow of Decemben 1885
TURNER & BAKER,
Agents for the Applicant.

page_text: Improvements in Gearing for Changing the Speed of Wheels.
I HENRY MAGUIRE HOLDEN of Saint Bartholomew's Vicarage, Bowling, Brad-
ford in the County of York do hereby declare the nature of my 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 that class of gearing in which one
wheel actuates a second wheel by means of an endless chain which engages in the
teeth or projections of both wheels; and in improvements whereby the relative
speeds of the two wheels can be altered or inter-changed.
To carry out my invention I employ an enlarging chain or chains for one or both
wheels formed of suitably shaped links, which fit between the teeth of each wheel,
and which chains are of the requisite length to pass once round the wheel and the
ends of which chains meet closely together. These ends are held in position by
flat springs riveted to each side of the chain and which fit into radial recesses
formed in the sides of the wheel whereby the wheel is clasped by the springs
which are provided at their ends with hooks or projections. Other flat springs are
fixed at intervals to the sides of the chain and project towards the centre, and
lie flat to the sides of the wheels for the purpose of securing the chains upon the
wheels laterally. These enlarging chains may be formed of any necessary thickness,
according to the diameter they are required to add to the wheel upon which
they are placed and upon their periphery or outer surface, the required number
of teeth are formed with which teeth the driving chain engages. One or both
of the wheels geared together may be fitted with the enlarging chains and these
chains may be removed from one wheel to another by means of a hook or other
suitable device actuated by a hand-lever, which hook when actuated catches one
end of the chain while revolving and releases it from the wheel upon which it is
clasped, and suitable guide rods, wires or channels are provided along which the
chain then passes to the other wheel upon which it clasps itself automatically while
revolving by means of the springs hereinbefore mentioned.
The two
In order to enable my invention to be clearly understood I will proceed to
describe the same with reference to the accompanying drawings in which Figure 1
represents a sectional elevation of my Improvements for changing the speed of
wheels applied as for example to the driving gear of a Velocipede. Figure 2
represents the enlarging chain or band detached from the Cog wheel.
Cogwheels A and B are geared together by means of the endless chain E the links
of which chain fit upon the cogs of the wheels as they revolve. In order to gain
power when the velocipede is ascending a hill, or to gain speed when running upon
a level road it is necessary to alter the proportionate size of the cogwheels upon
the driving wheel axle or upon the treadle shaft. To effect this purpose I make
use of an enlarging band or chain, which fits upon either of the Cogwheels and
which is represented at F. This enlarging chain which has internal projections
fitted into the teeth of the cogwheel upon which it is placed, has teeth projecting
outwards, similar in size and pitch to those upon the cog wheels, but more in
number, so that when this enlarging chain is placed upon one of the cog wheels,
it causes that wheel to be larger in diameter, and to present a driving surface of

page_text: greater circumference and several more teeth than the other wheel which has no
enlarging chain upon it. Therefore by placing the enlarging chain upon the axle
of the driving wheel, I am enabled to gain power, and by transferring the same
enlarging chain to the treadle shaft I am enabled to gain speed. The enlarging
chain F is by preference made of steel and joined at intervals by the links and
rivets shown at G. And these links are formed with semicircular projections
which clip the sides of the wheel and thereby retain the enlarging chain in its
proper position upon the teeth of the wheel and prevent the chain from working
off laterally. In order to transfer the enlarging chain F from one cog wheel to the
other, without stopping the same I leave the division between the two ends of
the chain unconnected at the dotted line H and by means of the forked catch K
(which when raised allows the driving chain E to pass between its prongs) which
catch is brought into action by means of the rods R and M. and the handle N the
points of the fork are caused to pass under and take up the two small pulleys J
which are attached by a spindle to one end of the enlarging chain, and these
pulleys after passing along part of the fork are carried along two parallel guide
wires D and carried forward to the other Cogwheel by means of the driving chain,
into which the outer teeth of the enlarging chain are geared. When the enlarging
chain arrives at the other Cogwheel it passes round it, and is there held in working
position by means of the driving chain, until transferred by the forked catch to the
other wheel in the manner described. Troughs fixed under the top parallel wires D
assist to guide the enlarging chain in its passage from one cog wheel to another,
and a casing of sheet metal P nearly surrounding the edges and sides of the
cogwheels prevents the enlarging chain from falling off from its proper working
position.
The system of gearing and changing the speed of wheels herein described may be
applied to Lathes, or other forms of mechanism driven by an endless chain.
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
WILLIAM JAMES BAKER,
Agent for the Applicant.