MENTS IN WHEEL GEARING."
Year: 1879

page_text: PROVISIONAL SPECIFICATION left by John Cousins Garrood at the Office
of the Commissioners of Patonts on the 26th November 1879.
JOHN COUSINS GARROOD, of Fakenham, in the County of Norfolk.
MENTS IN WHEEL GEARING."
** IMPROVE-
Heretofore geared wheels have been so constructed that the wearing away of the
teeth is not compensated for, consequently after they have been in use for a time
there is so much backlash or looseness that they pitch and rattle (more especially
where the work is unequal) which decrease their durability, and increase the
liability of their breaking.
The object of my improvements is to set up or compensate for the wearing away
of the teeth of cog or gear wheels of all descriptions, consequently reduce backlash
or looseness, pitching, and rattling, and increase their durability by decreasing the
liability of their breaking to a minimum.
My improvements consist, firstly,-
In combining two or more geared wheels together side by side of the same
diameter, pitch, and number of teeth, making one wheel as it were. One of theso
combined gear wheels is secured to the shaft, and the other of these combined
geared wheels is secured to the one secured to the shaft, and is an adjustablo wheel
to the other wheel.
These combined gear wheels gear into a wheel or pinion of the same pitch of
teeth, but any diameter or number of teeth required; the teeth of this gear wheel
or pinion will be as wide as the teeth of the combined gear wheels are together.
These wheels are combined for the purpose of adjusting the teeth of each wheels
as they wear away to the teeth of the pinion or wheel they gear into. To adjust
the teeth of these combined geared wheels to the teeth of the wheel or pinion they
nay gear into the adjustable wheel is turned round a little on its axis so as to move
the teeth out of the line sufficient to fit the teeth of the wheel or pinion they gear
into, thus compensating for the wear of the teeth of the wheels to reduce looseness
or rattling and liability to breaking to a minimum and thereby increase their
durability.
Secondly. In making the teeth of geared wheels or pinions tapering, that is,
smaller at one end of the tooth on one side of the wheel than the other end of
the tooth on the other side of the wheel, having the same pitch lines running
through the teeth, parallel with the shaft, or otherwise, and the pitch line of the
same diameter at each end of the teeth, or otherwise, both the smallest and the

page_text: largest ends. The small ends and the large ends of the teeth are the same distance
from the pitch lines to the bottoms or roots of the teeth, and also the same
distance from the pitch lines to the tops or outsides of the teeth at each end
of the teeth.
These geared. wheels or pinions are secured to their respective shafts so that the
largest ends of the tapered teeth of one wheel gear into the smallest ends of
the tapered teeth on the other wheel or pinion. As the tapered teeth of these geared
wheels wear away they are adjusted to each other by advancing one or both wheels
on their respective shafts in opposite directions, that is, so as to bring the largest
ends of the teeth of one wheel nearer the smallest ends of the teeth of the other
wheel or pinion it gears into.