IMPROVEMENTS IN TEETH GEARING FOR HORSE POWER AND OTHER PURPOSES
Year: 1873

page_text: PROVISIONAL SPECIFICATION left by Cyrus Avery at the Office of the
Commissioners of Patents, with his Petition, on the 11th July
1873.
I, CYRUS AVERY, of Little Cross Street, Islington, in the County of
Middlesex, Engineer, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN TEETH GEARING FOR HORSE POWER AND OTHER PURPOSES,"
to be as follows:-
This Invention consists of improvements in teeth gearing for horse-
power engines, and other purposes, and the following is a description of
my Invention in a simple form :--
The main wheel consists simply of a rim without boss or arms, and
does not revolve but is fixed into suitable framing by its outer
periphery, and has teeth formed on its inner surface. This wheel is
covered in at the top by a plate (made to revolve for the purpose herein-
after described) running on rollers attached to the under side thereof,
and traversing the rim of the main wheel as the said plate revolves.
This plate (to which the horse or other power is applied to turn it) is

page_text: also held down in position by clutches, which take on to an outer rim of
the said wheel, and carries on its under side two toothed pinions directly
opposite one another, which gear into the teeth of the main wheel, and
so receive rotary motion as the plate revolves, each of the said pinions
making several revolutions to every one of the plate. These pinions
carry on the same centres larger toothed wheels (which I call the first
intermediate wheels) working over or under the said main wheel, and
which of course make one revolution to each revolution of the said
pinions.
I prefer that these wheels should work over the main wheel as they
may conveniently do so between it and the said plate in the space
formed by the said rollers on which the plate rests. These intermediate
wheels gear into a centre pinion supported on a vertical axis, which
pinion in its turn makes several revolutions to cach revolution of the
intermediate wheels. The said vertical axis is supported at its lower end
in a suitable step and at its upper end in the said revolving plate
through which it projects, and carries at some distance below the said
pinion an arm near the outer end of which a pinion is centered on a pin
or stud.
This pinion gears into a second stationary rim wheel like the main
wheel, that is, with the tecth on its inner surface, so that as the said
vertical axis revolves the said last mentioned pinion will receive rotary
motion, and will make several revolutions to each one of the vertical
axis. This pinion also carries on the same centre a larger toothed wheel,
which I call the second intermediate wheel working over or under the..
said second stationary toothed rim wheel, and which will of course.
make one revolution to each revolution of the pinion to which it is
attached.
This second intermediate wheel gears into a second central pinion placed.
as follows:-The said vertical axis is bored out from its upper end down
to a point about opposite the said second intermediate wheel, where the
said axis is made to bulge out, so as to form a cavity just at the bottom.
of the said boring large enough to admit of a pinion being inserted, the
side next the said second intermediate wheel being open for that
purpose. This pinion is also attached to a vertical axis passing up the
said boring in the first mentioned vertical axis. The second inter-

page_text: mediate wheel gears into this pinion, which makes several revolutions to
each one of the said second intermediate wheel. Thus one axis revolves
within the other, and both in the same direction, the inner one turning
much more rapidly than the outer. Each axis may also be provided
with a pulley or other gearing for communicating the motion to where
required for use.