IMPROVE- MENTS IN THE DRIVING GEAR OF MACHINES FOR PLANING OR SHAPING METAL
Year: 1884

page_text: I, GEORGE WILKINSON of 15, Strawberry Street, Keighley, in the County of
York, Engineer, do hereby declare the nature of said Invention for "IMPROVE-
MENTS IN THE DRIVING GEAR OF MACHINES FOR PLANING OR SHAPING METAL,"
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
My Invention has reference to the driving gear of planing and shaping machines
and the like, wherein either the object under treatment (hereinafter called the
work) is caused to travel past the cutting tool, or the cutting tool is made to pass
over the work. Usually the work or the cutting tool as the case may be, is made
to travel by means of a pinion taking directly into a rack, and owing to the
comparatively small diameter of the pinion there is a liability to cause partially
irregular and intermittent movement, and in some cases to lift the work against
the cutting tool, or the cutting tool against the work, and thus to produce an
uneven surface.
Now in order to obtain a more regular and smooth motion and to obviate the
evil above referred to, instead of arranging the pinion to take directly into the
rack as is usual, I interpose between the pinion and the rack, a duplex wheel
having internal and external teeth so arranged that the pinion gears with the
internal teeth thereby driving the duplex wheel in the same direction as itself
rotates, and imparts a smooth rolling motion to the duplex wheel with but a small
amount of friction between its teeth and those of the pinion. The externally
toothed periphery of the duplex wheel which has necessarily a much larger
diameter than the usual rack pinion, takes directly either into the rack of the
table of the machine upon which the work is mounted, or into the movable part
carrying the cutting tool.
By this arrangement it will be evident there will be a greater number of teeth
in contact with those of the rack, at a time, than is the case when it is actuated
directly by the ordinary pinion, and owing to the nearer approximation of the line
of the external teeth of the duplex wheel to the line of the rack, there is much less
liability to lift the table and work, and consequently more regular movement is
imparted thereto, and a more perfect and smooth surface can be produced upon the
work. The external and internal wheels constituting the duplex wheel may be in
separate parts but I consider it better to cast them together as one wheel.

page_text: In the accompanying Drawings, Fig. 1. is a cross-sectional elevation skewing a
bed a, and table b, of a planing machine with my Invention applied, and Fig. 2.
is a part side elevation of the gearing referred to, c, is what is usually known as
the rack pinion, but which I place as shewn in gear with the teeth d', of the
duplex wheel d, whose external teeth d², I gear with the rack c.
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
In the driving gear of a machine for planing or shaping metal, the use in
conjunction with a pinion such as c, of an internal wheel in gear therewith, and an
external wheel either made in one with the said internal wheel or separate
therefrom; such external wheel being in gear with the rack of the table carrying
the work, or with the rack of the part carrying a movable cutting tool, as the case
may be, substantially as hereinabove described and illustrated.
Dated this yɩu day of Septemb
GEORGE WILKINSON.
W. Lloyd Wise,
Per F. J. Brougham,
Applicant's Agent.