An Improved Oscillating Motor.
Year: 1894

page_text: Date of Application, 7th Sept., 1894
Complete Specification Left, 21st Feb., 1895-Accepted, 6th Apr., 1895
An Improved Oscillating Motor.
I, JOHN SMITH MANDREW, of 18 Royal Crescent, Glasgow, W., in the
County of Lanark, North Britain, Gentleman, do hereby declare the nature of
this invention to be as follows:-
This invention relates to an improved oscillating motor, which may be actuated
by steam or other power and the said motor may be applied for marine and other
purposes.
In carrying out my invention as applied to an oscillating steam engine for driving
a single crank, I employ a metal cylinder having two flat side faces, trunnions,
covers, stuffing boxes and glands; the said side faces are formed with circular
bosses from the peripheries of which the necessary steam passages pass to each
end of the cylinder, as also the outlet or exhaust passages which goes through the
trunnions.
Upon each of the said bosses I mount a circular sleeve having one or more
flanges, the peripheries of which would be formed as spur wheels, or it may be
only a part of said peripheries that are formed as spur segments. The said sleeve
is provided with two steam inlet ports and an exhaust passage; said sleeve may
be formed in one or more parts and of any desired metal.
The said sleeves act as the reversing gear as well as the bushes for the engine to
oscillate in, owing to their being mounted in the circular top ends of two suitably
shaped standards or brackets which have the necessary inlet steam passages or
chests formed in them.
Inside the said cylinder I mount a suitable piston to the one side of which
I attach a piston rod the front or outer end of which is attached to the crank that
is to be driven. To the other side of the said cylinder I attach a guide rod, said
rod working through the rear or back cover.
In order to reverse the said engine I suitably gear a spur pinion into each of
the spur segments or wheels of the sleeves, said pinions being mounted on one or
more cross shafts which may be actuated by any suitable lever, spur or bevel
gearing arrangement.
When desired to employ the said engine for driving twin screws or propellers
for the propuls on of vessels, I mount a piston rod to each side of the piston and
connect each of the said rods to the cranks of the shafts; thus providing an engine
which will drive both of the shafts simultaneously and in opposite directions to
each other.
Also if desired I may employ two of the said cylinders mounted at right angles
to each other and connected to the one crank so as to form a double cylinder
diagonal engine for driving screw propellers, or paddles of steamers, pumps or
other machinery.
The whole arrangement thus forming a motor in which there are few working
parts and one which will run at a smooth and steady speed.
i Dated this 6th day of September 1894.
JOHNSONS,
115, St. Vincent Street, Glasgow, Petitioner's Agents.

page_text: COMPLETE SPECIFICATION.
An Improved Oscillating Motor.
I, JOHN SMITH 'MC ANDREW, of 18 Royal Crescent, Glasgow, in the County
of Lanark, North Britain, Gentleman, 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 relates to an improved oscillating motor, which may be actuated
by steam or other power, and which may be used or applied for marine and other
purposes though my invention is more especially applicable for driving single or
twin screws or propellers for the propulsion of boats or vessels.
:
In carrying out my invention I proceed in accordance with the following
description, and as is illustrated in the accompanying drawings.
Figure 1 is an elevation and Figure 2 a plan of my improved motor as adapted
for driving a single shaft by steam power.
Figures 3, 4, and 5 are detail views of the same.
And
Figures 6, 7, and 8 are detail views of a modification of same.
Referring to Figures 1 to 5 inclusive of the said drawings, I employ a metal
cylinder A, having two flat side faces a, a' two hollow trunnions B, B', two
covers C, C with stuffing boxes and glands c, c'-the said side faces a, a¹ are
formed or provided with circular hosses D, D', from the peripheries of which' the
necessary steam passages or ports E pass to each end of the cylinder A, as also
the outlet or exhaust passages or ports F which lead to the hollow trunnions B
and so permits the exhaust steam to exhaust out.
Upon each side or around the peripheries of the said bosses D; D', I mount
circular sleeves G, G¹ having one or more flanges g, the peripheries of which would
be formed as spur wheels though preferably only a part g' of said peripheries are
formed as spur segments. The said sleeves G, G' are provided with two steam
inlet passages or ports H and exhaust passages or ports J; said sleeve G, G¹ may
be formed in one or more parts and of any desired metal. The said sleeves G, G¹
act as the reversing gear as well as the bushes for the engine to oscillate in, owing
to their being mounted in the circular top ends of two suitably shaped standards
or brackets K, K¹ which have the necessary inlet steam passages or chests L and
ports formed in them.
Inside the said cylinder I mount a suitable piston to the one side of which
I attach a piston rod M, the front or outer end m, of which is attached to the crank N
that is to be driven. To the other side of the said piston I attach a guide rod M¹
said rod working through the rear or back cover C¹.
may
In order to reverse the said motor or engine I suitably gear a spur pinion into
each of the spur segments g¹ or wheels of the sleeves G, G¹, said pinions P, P,
being mounted on one or more cross-shafts which be actuated by any suitable
lever, spur or bevel gearing arrangement. Though I prefer to employ an actuating
arrangement as is shewn more particularly in Figures 1 and 2, that is to say,
I employ a cross-shaft Q to the one end of which I key or otherwise mount the spur
pinion or pinions P₁ for actuating the sleeve G₁ through the medium of the
handle g, and the pinion or pinions P for actuating the sleeve G is or are mounted
on a sleeve Q' mounted on the said shaft Q, in such a manner, as to enable the said
pinions to be actuated by the handle g.
Of course it is to be understood that the whole of the foregoing working parts are
mounted and carried on a suitable soleplate or other framing, and also that
necessary lubricating means and steam and exhaust connections are provided.
The whole arrangement thus forms an efficient, smooth and steady running
engine or motor, in which there are neither valves, eccentrics, link motion nor their
connections employed, and in which the action is as follows:-
Suppose the motor is going in the direction shown by the arrows in Figures 1

page_text: to 7: the steam valve R will be open so as to lead the supply into the chamber or
chest L and so give a free supply port or passage (when the crank N is as shewn
in Figures 1, 2, 3 and 4) through the ports 1, H and E as shewn in Figure 3, and
also a clear or open exhaust port from the front of the cylinder A through the
ports E, J, and F and thence out through the hollow trunnion B. During the
foregoing action the steam and exhaust ports in the opposite sleeve G' and its
connectious are shut off from the supply of steam and exhaust and the position of
the crank being as shewn, the ports would be as shewn in Figure 5. Upon the
crank N reaching the dead centre as shewn in Figure 4 the ports take up the
position as shewn from which it will be seen that they are just beginning to open
so as to bring back the crank to the next back centre as shewn by the arrows.
To reverse the said motor all that is necessary is to reverse or change the
positions of the handles 9, 9', and supply valve R, when the motor will immediately
run in the opposite directions.
As a modification of the foregoing and as is shewn in Figures 6, 7, and 8 of the
drawings, I may only employ one reversing sleeve and connections at the one side
only of the cylinder A and form the other or opposite boss and trunnion as a simple
bearing working in a bushed bracket. In this arrangement the boss D would be
formed with a double set, or an upper and lower set of steam ports E, E and F, F,
also the sleeve G and steam chest K would have double sets of ports or passages
either pair of which would come into position on the sleeve getting one half of a
revolution by means of its actuating mechanism.
When desired to employ the said engine for driving twin screws or propellers
for the propulsion of vessels, I mount a piston rod to each side of the piston and
connect each of the said rods to the cranks of the shafts, thus providing an engine
which will drive both of the shafts simultaneously and in opposite directions to
each other.
Also if desired I may employ two of the said cylinders mounted at right angles
to each other and connected to the one crank so as to form a double cylinder
diagonal engine for driving screw propellers, or paddles of steamers, pumps or
other machinery.
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 :-
1st. The general arrangement, combination and construction of the various parts
constituting my improved oscillating motor, substantially as hereinbefore described
and shewn in the accompanying drawings.
2nd. In oscillating motors, the arrangement of an oscillating cylinder having flat
sides with hollow trunnions or bosses D, said bosses D working within movable
sleeves G, G', which work in stationary brackets or steam chests K, K¹; said
bosses, sleeves and chests being provided with the necessary supply and exhaust
ports, whereby the motor may be reversed, substantially as hereinbefore described
and shewn in the accompanying drawings.
3rd. In oscillating motors, the means whereby a reverse motion may be given to
one or more movable sleeves G, G' working between the trunnions and steam
chests: baid sleeves, trunnions and chests being provided with the necessary supply
and exhaust ports, substantially as herein before described and shewn in the
accompanying drawings.
11
DOL 1
1
1007
JOHNSONS,
115, St. Vincent Street, Glasgow, Applicant's Agents.