Improvements in Speed Reducing or Increasing Gear for Transmitting Power from Rotating Shafts.
Year: 1896

page_text: Date of Application, 22nd June, 1896
Complete Specification Left, 22nd Mar., 1897-Accepted, 22nd May, 1897
PROVISIONAL SPECIFICATION.
Improvements in Speed Reducing or Increasing Gear for
Transmitting Power from Rotating Shafts.
I, JAMES MACEWAN Ross, of the Firm of R. G. Ross and Son, Engineers,
Greenhead Works, in the City of Glasgow, do hereby declare the nature of this
invention to be as follows:-
This invention has for its object to provide simple and efficient speed reducing
gear for use more especially in coupling or connecting dynamos and other rapidly
rotating motors or shafts to the spindles of various kinds of tools and apparatus,
such for example as boring or drilling tools, warping or winding drums and
the like.
To that end the rotating shaft of the motor or other rotating shaft has keyed on
it eccentrically a boss or short cylindrical shaft or has formed on it a crank or
eccentric on which is loosely fitted a duplex toothed wheel or pair of wheels united
together side by side one being of larger diameter than the other. The one toothed
wheel or portion of the wheel is geared with an internally toothed wheel secured
by flanges or otherwise on a stationary part of the dynamo framing or bearing
block of the driving shaft, and the other wheel is geared with an internally
toothed wheel of larger diameter keyed on the driven shaft. Upon rotation of the
driving shaft, the smaller toothed wheel rolls around the stationary internally
toothed wheel whilst the second toothed wheel carries around with it the internally
toothed wheel on the driven shaft and thereby drives the latter at a reduced rate of
speed. By reversal of the coupling arrangement the speed of the driven shaft
instead of being reduced is increased. A counter-balancing weight may be secured
on the eccentric boss or wheels to ensure uniform rotation.
The arrangement of gearing set forth may be modified as for example by fitting
two or more pairs of toothed wheels or pinions on an end disc on the driving shaft
to gear with an internally toothed wheel on the driven shaft; or a single externally
toothed wheel on the driven shaft may be geared with a toothed wheel on the
driving shaft having both internal and external teeth gearing also with an internally
toothed stationary wheel.
Dated this 20th day of June 190
COMPLETE SPECIFICATION.
Improvements in Speed Reducing or Increasing Gear for
Transmitting Power from Rotating Shafts.
I, JAMES MACEWAN Ross, of the Firm of R. G. Ross and Son, Engineers,
Greenhead Works, in the City of Glasgow, do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
This invention has for its object to provide simple and efficient speed reducing

page_text: gear for use more especially in coupling or connecting dynamos and other rapidly
rotating motors or shafts to the spindles of various kinds of tools and apparatus,
such for example as boring or drilling tools, warping or winding drums and
the like.
The invention is illustrated by the accompanying drawings,
Figs. 1 and 2 being sections at right angles to each other, that of Fig. 2 being
taken on the line x-x, Fig. 1. Figs. 3 and 4 are sections corresponding to Figs. 1
and 2 respectively of a modification of the improved gear, Fig. 4 being taken on
the line yy, Fig. 3.
In the modification illustrated by Figs. 1 and 2 the rotating shaft of the motor
or other rotating shaft A has keyed on it eccentrically a boss or short cylindrical
shaft or has formed on it a crank or eccentric B on which is loosely fitted a duplex
toothed wheel or pair of wheels C, C', united together side by side one being of
larger diameter than the other. The one toothed wheel or portion C of the wheel
is geared with an internally toothed wheel D secured by flanges or otherwise on a
stationary part E of the dynamo framing or bearing block of the driving shaft A
and the other wheel C¹ is geared with an internally toothed wheel F of larger
diameter keyed on the driven shaft G. Upon rotation of the driving shaft A the
smaller toothed wheel C rolls around the stationary internally toothed wheel D
whilst the second toothed wheel C¹ carries around with it the internally toothed
wheel F on the driven shaft G and thereby drives the latter at a reduced rate of
speed. By reversal of the coupling arrangement the speed of the driven shaft
instead of being reduced is increased. A counter-balancing weight H may be
secured on the eccentric boss B or wheels to ensure uniform rotation.
The arrangement of gearing set forth in Figs. 1 and 2 may be modified as shewn
by Figs. 3 and 4 by fitting two or more pairs of toothed wheels or pinions I, I', on
an end disc J on the driving shaft A the pinions I of which gear with the internally
toothed stationary wheel D secured on the framing of the motor or driver and the
pinions I carry round with them the internally toothed wheel F on the driven
shaft. This arrangement admits of the counter-balancing weight being
dispensed with.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what 1
claim is :-
1. The arrangement of speed reducing or increasing gear for transmitting power
from rotating shaft constructed to operate substantially as described with reference
to Figs. 1 and 2 of the accompanying drawings.
2. The arrangement of speed reducing or increasing gear for transmitting power
from rotating shaft constructed to operate substantially as described with reference
to Figs. 3 and 4 of the accompanying drawings.
Dated this 20th day of March 1897
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
62 St. Vincent Street, Glasgow, Agent for the Applicant.