A Method of Working Valves of Gas and Oil Motors, and Apparatus for that purpose.
Year: 1894

page_text: Date of Application, 1st Mar., 1894
Complete Specification Left, 1st Dec., 1894-Accepted, 5th Jan., 1805
PROVISIONAL SPECIFICATION.
A Method of Working Valves of Gas and Oil Motors, and Apparatus
for that purpose.
I, HENRY PERCY HOLT, of No. 22 Chancery Lane, in the County of London,
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to means of working the valves of gas and oil motor
engines operating on what is known as the "Otto cycle
"the object of my
invention being to dispense with the counter shaft and gear usually employed
for opening the exhaust and other valves at every alternate revolution of the
crank shaft.
For this purpose I provide a reciprocating rod which, if it were directly
connected to a valve would move it at every revolution, but I divide this rod into
two parts, one of which is pivotted as an arm of a lever, having on it a weight or a
weight controlled by a spring. At one revolution of the shaft the weight is in such
a position that the pivotted part of the rod is in line with the other part, and in
that case the valve is opened. As the valve closes the weight on the arm, by
virtue of its momentum, moves the pivotted part of the rod out of line with the
other part, and consequently at the next revolution the rod fails to open the valve.
The valve then remaining at rest, the weight resumes its original position so that at
the next revolution the valve is opened, and so on alternately.
Dated this 1st day of March 1894.
ABEL & IMRAY,
Agents for the Applicant.
A Method of Working Valves of Gas and Oil Motors, and Apparatus
for that purpose.
I, HENRY PERCY HOLT, of No. 22 Chancery Lane, in the County of London,
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 invention relates to means of working the valves of gas and oil motor
engines operating on what is known as the "Otto cycle," the object of my
invention being to dispense with the countershaft and gear usually employed
for opening the exhaust and other valves at every alternate revolution of the
crank shaft.
For this purpose, I employ apparatus which I shall describe referring to the
accompanying drawings.
Fig. 1 is a side view of gear according to my invention for working the exhaust
valve, the box of which is shewn in section.
Fig. 2 shows a modification of the gear applicable in cases where the governing
of the engine is effected by the non opening of the exhaust valve when the speed
of the engine is too great.

page_text: I provide a reciprocating rod made in two parts, the one part A linked to an
eccentric B on the crank shaft C, the other part being the one arm D of a lever,
the other arm of which carries a weight E. The lever is pivotted on the stem F
of the valve G. When the parts are in the position shewn in Figure 1, the end of
the rod A advancing in the direction of the arrow meets the end of the arm D
and pushes it and the stem F on which it is pivotted so as to open the valve G.
When the rod A retreats, the arm D moves back to the left, and with it the
weight E until the valve G closes, but as D cannot move farther to the left, the
weight E, in virtue of its momentum, continues to move to the left and thus throws
the arm D into such a position, indicated by the dotted lines D', that at the next
forward stroke the rod A misses D, consequently the valve G is not opened, until
the weight E and arm D having attained their normal position, the rod A again
advances, meeting D and opening the valve. Thus the valve is opened only at
every alternate forward stroke. A rod H may be connected to the sliding part of
a centrifugal governor so that when the speed is too great the arm D is withdrawn
by the governor out of line with the rod A, the exhaust valve then remaining
closed at the time when it would be opened if the speed were normal. Instead of
employing a centrifugal governor in this way, an inertia governor may be applied
as shown in Fig. 2. In this case there is mounted on the rod A a lever, like that
on the valve stem F, having an arm K and a weight L. When the rod A. advances
at normal speed, the end of the arm K meets the end of D and the valve G is
opened. But when the rod A advances at greater than normal speed, the weight L,
in virtue of its inertia, lags behind causing the arm K to deviate as indicated
by the dotted lines K', and so to miss meeting D, the valve G then remaining
closed.
In cases where the valve and ports are differently arranged, as for instance where
the reciprocating rod moves vertically or nearly so, a spring may be applied to
support the weight without interfering with its momentum, and suitable levers
and links may be interposed, if necessary, between the lever D and the valve
stem.
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 herein described method of working a valve of a gas or oil motor engine,
at every alternate revolution of the crank shaft, by arranging an arm for working
the valve in such a manner that it is alternately met and missed by a rod
reciprocating at every revolution, the missing being caused by the momentum of a
weight which, moving with the valve as it closes and continuing to move when the
valve is closed, makes the arm to which it is connected deviate from the path of
the reciprocating rod at its next reciprocation.
2. For operating a valve of a gas or oil motor engine in the manner above set
forth, the combination of a reciprocating rod worked by an eccentric or its
equivalent on the crank shaft, and a weighted lever pivotted on the valve
substantially as described.
Dated this 30th day of November 1894.
ABEL & IMRAY,
Agents for the Applicant.