IMPROVEMENTS IN THE CONSTRUCTION OF TOOTHED GEARING
Year: 1876

page_text: LETTERS PATENT to James Gee, of Salford, in the County of Lancaster, Engineer,
for the Invention of "IMPROVEMENTS IN THE CONSTRUCTION OF TOOTHED
GEARING."
Sealed the 26th May 1877, and dated the 14th December 1876.
PROVISIONAL SPECIFICATION left by the said James Gee at the Office of
the Commissioners of Patents on the 14th December 1876.
JAMES GEE, of Salford, in the County of Lancaster, Engineer. "IMPROVEMENTS
IN TILE CONSTRUCTION OF TOOTHED GEARING."
The object of my Invention is to increase the strength of toothed gearing, while
maintaining the driving strain as far as possible in a line with the circumferences of
the wheels, so that there may be as little friction on the bearings of the axles to
which the wheels are fixed as is practicable.
My Invention is equally applicable in the construction of racks and pinions.
In toothed wheels of the ordinary construction the teeth are made of the same
shape on each side of a radial line passing through the centre of the tooth; now
my Invention consists in making one side of the tooth more inclined than the other.
The side that is least inclined is the driving side, and it is struck out according to
the epicycloidal or other form to prevent friction, while the off side of the tooth is
more inclined than the working side, and is enlarged at its base to increase the
strength; this off side may be of any suitable shape.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said James Gee in the Great Scal Patent Office on the 14th June 1877.
JAMES GEE, of Salford, in the County of Lancaster, Engineer.
IN THE CONSTRUCTION OF TOOTHED GEARING."
"IMPROVEMENTS
The object of my Invention is to increase the strength of toothed gearing while
maintaining the driving strain as far as possible in a line with the circumferences of
the wheels, so that there may be as little friction on the bearings of the axles to
which the wheels are fixed as is practicable.
My Invention is equally applicable in the construction of racks and pinions.
Price Fi

page_text: In toothed wheels of the ordinary construction the teeth have hitherto been made
of the same shape on each side of a radial line passing through the centre of the
tooth; now my Invention consists in making one side of the tooth more inclined
than the other. The side that is least inclined is the driving sido, and it is struck
out according to the epicycloidal or other form, to prevent friction, while the off side
of the tooth is more inclined than the working side, and is enlarged at its base to
increase the strength; this off side may be of any suitable shape.
And in order that my Invention may be fully understood, and readily carried in
operation, I will proceed to describe the accompanying Sheet of Drawings, in
which,―
Fig. 1 represents a wheel and pinion constructed according to my improvements,
the wheel A revolving in the direction shewn by the arrow, being the driver of the
pinion B; but if the wheels are made to revolve in the contrary way the pinion
then becomes the driver; the teeth of the wheel and pinion in either case are in
contact and work against each other on that side of the tooth that has the least
inclination from a radial line drawn through the centre of the tooth at the pitch
line and through the centre of the wheel.
It will be evident that wheels might be used and the teeth put in contact on the
opposite side, or that side with the most inclination, if the inclination were not
excessive, and the increase of strength which I arrive at would be the same, but the
wheels could not work satisfactorily, and it would only be done with the view of
trying to evade my Patent.
The above remarks refer to the rack and pinion, as well as to a pair of wheels.
Figure 2 represents a rack and pinion constructed according to my improvements,
the pinion C being the driver of the rack E; or by reversing the positions of the
rack and pinion the rack may become the driver.
In the construction of toothed gearing it has hitherto been the practice to make
both sides of the tooth of the same shape, and equal on each side of a radial line
passing through the centre of the tooth. Now my Invention consists in constructing
toothed gearing with the tooth of a shape altogether different on the off or back side
to the front or driving side, by rounding or taking off material from the point, or
that portion of the tooth above the pitch line, and adding to it at the root of the
tooth or below the pitch line.
In toothed gearing constructed according to my Invention I always prefer the
driving side of the tooth to have the least inclination, and to be the least rounded
nt the point and root, and it can be made of the epicycloidal or other shape best
adapted for smooth and effective working. The off side or back side is most rounded
at the point and most inclined, so as to increase the strength.
Having thus stated the nature of my Invention, and described two convenient
modes of performing the same, I wish it to be understood that I do not intend to
limit myself to the details given, and that I claim, the construction of toothed
gearing having teeth of the form as described herein and shewn in the Drawings
annexed.
In witness whereof, I, the said James Gee, have hereunto set my hand and
seal, this Eleventh day of June, One thousand eight hundred and seventy-