Improvements in Gas and Oil Motor Valve Motion.
Year: 1895

page_text: Date of Application, 2nd Feb., 1895
Complete Specification Left, 23rd Apr., 1895-Accepted, 8th June, 1895
PROVISIONAL SPECIFICATION.
Improvements in Gas and Oil Motor Valve Motion.
THOMAS ALFRED WILLIAM CLARKE Engineer Havelock Works Havelock
Street Leicester do hereby declare the nature of this invention to be as follows:-
My improvement consists in the introduction of a cam that will give motion to
a valve or valves, once only in two revolutions of cam instead of one motion every
revolution as hitherto used.
For this purpose I propose to use a cylinderical or a disc shaped cam securely
fastened to crank shaft. Around the cylinderical or disc shaped cam 1 propose to
cut or cast a groove or rib having the form of a figure 8, in the disc shaped cam
to get this figure one circle is inside the other, but intersecting each other in one
place.
In either cam grooves or on rib I propose to fit a T shaped peice or bolt so that
it will follow the groove or rib freely or cross in the groove or on the rib from
one circle to the other to complete the figure 8 and so continue, the cam to make
two revolutions before the bolt or T shaped peice arrives at the same place in
groove or on rib that it started from.
The Tshaped peice or bolt has a round stem which fits freely in a hole in a boss
at end of a lever so that it may turn in the direction of the groove or on rib and
follow it from end to end of cam.
The lever rocks upon an axis and at the opposite end to cam may act directly
upon the valve or valves.
One or more T peices or bolts actuating one or more levers may be operated
upon by the same cam.
Oil or gas motors made with this improvement have fewer parts causing less
friction, is less likely to get out of order, is more reliable in, action and much
cheaper in construction.
Dated this Wirst day of February 1895.
COMPLETE SPECIFICATION.
Improvements in Gas and Oil Motor Valve, Motion.
THOMAS ALFRED WILLIAM CLARKE' 'Havelock Works 100 Havelock Street
Leicester. Engineer 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:-
My improvement consists in the introduction of a cam that will give motion to
a valve or valves once only in two revolutions of same, instead of one motion every
revolution as hitherto used.
For this purpose I propose to use a cylinderical or a disc shaped cam securely
fastened to the crank shaft.
Around the cylinderical shaped cam I propose to cut or cast a groove or rib
having the form of a figure of 8, in the disc shaped cam I also propose to cut or

page_text: cast a groove or rib and in order to get the figure necessary for the motion,
I propose to put one circle inside the other but intersecting each other in one
place.
In either cam grooves or on rib I propose to fit a 1 shaped peice or bolt so
that it will follow a groove or rib freely and cross in groove or on rib from one
circle to the other to complete the figure and so continue, the cam to make two
revolutions before the piece or bolt arrives at the same place in groove or on rib
it started from.
The shaped peice or bolt has a round stem which fits freely in a boss at end
of a lever so that it may oscilate in the direction of the groove or rib of cam and
follow it from end to end of cam.
The lever rocks upou an axis and at the opposite end to cam may act directly
upon the valve or valves.
One or more 1 peices or bolts actuating one or more levers may be operated
upon by the same cam.
The cams shown in drawings are constructed with grooves but may be constructed
with a rib around them instead of a groove.
Oil or gas motors made with this improvement has fewer parts, causing less
friction, is less likely to get out of order, is more reliable and much cheaper in
construction.
I will now proceed to explain drawing as filed herewith.
A Fig. 1 is a portion of a lever working on an axis with boss at end carrying a
1 shaped peice or bolt B, the stem of which fits freely a hole in boss of lever, to
allow it to oscillate to accomodate the angle of groove in cam which groove it
follows as cam C revolves and during two revolutions causes the lever to which
1 piece is attached to make one complete motion actuating one or more valves.
The cam C may be securely fastened to the crank shaft or any other shaft of
the motor, having the same number of revolutions in a given time as crank shaft.
Fig. 2 represents elevation of cylinderical cam and lever with 1 peices.
Fig. 3 represents the front elevation of a disc cam with grooves which may be
used instead of the cylinderical shaped cam herein before described for giving a
similar motion.
Fig. 4 shows sectional elevation of disc cam.
Although I believe the cams herein before described to be original, I do not claim
for the cam otherwise than introduced to oil and gas motors.
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 I
claim is
1st. For the introduction of such a cam in oil or gas motors.
2ndly. For a cam so constructed and as hereinbefore described to give one motion
in two or more revolutions.
3rdly. For a cam to give motion to one or more levers once in two or more
revolutions for actuating a valve or valves.
Dated this Twenty-fourth. day of December 1894.