Mechanism for Actuating the Valves of Gas and Oil Motor Engines.
Year: 1899

page_text: Date of Application, 30th May, 1899
1000
200
Date of Application, soin may, 1099
Complete Specification Left, 30th Mar., 1900-Accepted, 80th Aug., 1900
PROVISIONAL SPECIFICATION.
Mechanism for Actuating the Valves of Gas and Oil Motor Engines.
I, CHARLES DENTON ABEL, of Birkbeck Bank Chambers, Southampton Buildings,
in the County of London, Consulting Engineer and Chartered Patent Agent, do
hereby declare the nature of this invention (as communicated to me from abroad
by Heinrich Eckhardt, of No. 13, Lutzow-Ufer, Berlin, Germany, Engineer),
to be as follows:
This invention has for its object to enable the moment at which a valve is
opened or closed by the valve gear to be varied in a simple manner by merely
shifting the position of the actuating lever. This arrangement may be applied
with advantage to the valves of all kinds of gas or oil motor engines, such for
instance, as to the air inlet valve, for adjusting the quantity of air admitted at
cach charge, or, in the case of the valve for admitting the combustible fluid,
for regulating the proportion of combustible fluid for each charge.
In the following description a third application will be described, namely
for decreasing the degree of compression during the starting of the engine.
As is known, the reduction of the compression in the engine cylinder during
the starting strokes, is effected by holding either the admission valve or the
discharge valve open during a portion of the compressing stroke, the closing of
such valve being for this purpose retarded to the required extent. Such retard-
ing of the closing of the valve is effected by shifting the position of the valve
lever to such an extent that the end thereof which is worked by the actuating
cam, is brought into a position in which it is acted upon by a supplemental
cam which may be situated behind the regular cam and so formed as to cause the
lever to continue to hold the valve open after the regular cam has ceased to
act upon it.
Such shifting of the lever can be effected in various ways, thus Figs. 1 and 2
shew respectively an elevation and a sectional plan of an arrangement in which
the shifting of the valve lever bis effected by mounting its fulcram con excentric
bearings, so that by turning these through a certain angle by means of a handle e¹
or other appliance the front end of the lever with the contact roller is moved
from the position shown in full lines at Fig. 2 into that shewn in dotted lines.
For ordinary working the lever b is situated in the position shewn in full
lines at Fig. 2, in which it can only be acted upon by the ordinary cam surface f
on the disc cam e for opening the valve during the suction stroke and not by
the lower cam surface g situated behind f, the lever b will consequently effect the
closing of the valve a as soon as the cam surface f has left the roller d this
being open in the position I shewn at Fig. 3, which represents a development of
the came travelling in the direction of the arrow 0 being the position of the
roller before being acted upon by cam surface f.
If now the excentric bearing c of lever 6 be turned through 90° so as to bring
will be
the pivot of the lever nearer to the plane of the disc came the lever
made to assume the position shewn in dotted lines in Fig. 2. by which the

page_text: roller d will be brought into the path of the supplemental cam surface y, so
that after the cam surface f has left the roller d this and its lever will still be
made to hold the valve a open by the cam surface g until this has left the roller
so that this can then come into the position II Fig. 3.
The above described action of the excentric bearings of lever b will be readily
seen from the diagrammatic view of the parts at Fig. 4.
The shifting of the pivot or fulcrum of lever b can of course be effected in
various other ways; thus, for example, shewn at Fig. 5, the lever b may be
mounted with a slotted opening on the rectangular part of pivot-bolt c, the ends
of which are pivotally mounted in the supporting bracket, so that by means of
a screw turned by a handle the lever can be shifted relatively to the pivot
in order to bring the roller d in the path of the supplemental cam g as before.
Or, according to another arrangement shown at Fig. 6, instead of shifting the
lever relatively to its fulcrum, the end of the lever which acts upon the stem
of the valve a can be provided with an adjustable screw stud a' by turning which,
that end of the lever can be moved farther away from the valve, and consequently
the roller d be brought into the path of the supplemental cam surface g.
Dated this 30th day of May 1899.
ABEL & IMRAY,
Agents for the Applicant.
Mechanism for Actuating the Valves of Gas and Oil Motor Engines.
I, CHARLES DENTON ABEL, of Birkbeck Bank Chambers, Southampton Buildings,
in the County of London, Consulting Engineer and Chartered Patent Agent, do
hereby declare the nature of this invention (as communicated to me from abroad
by Heinrich Eckhardt, of No. 13, Lutzow-Cfer, Berlin, Germany, Engineer),
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 enable the moment at which a valve is
opened or closed by the valve gear to be varied in a simple manner by merely
shifting the position of the actuating lever. This arrangement may be applied
with advantage to the valves of all kinds of gas or oil motor engines, such for
instance, as to the air inlet valve, for adjusting the quantity of air admitted at
each charge, or, in the case of the valve for admitting the combustible fluid,
for regulating the proportion of combustible fluid for each charge.
In the following description a third application will be described, namely
for decreasing the degree of compression during the starting of the engine.
As is known the reduction of the compression in the engine cylinder during
the starting strokes, is effected by holding either the admission valve or the
discharge valve open during a portion of the compressing stroke, the closing of
such valve being for this purpose retarded to the required extent. Such retard-
ing of the closing of the valve is effected by shifting the position of the valve
lever to such an extent that the end thereof which is worked by the actuating
cam, is brought into a position in which it is acted upon by a supplemental
cam which may be situated behind the regular cam and so formed as to cause the
lever to continue to hold the valve open after the regular cam has ceased to
act upon it.
Such shifting of the lever can be effected in various ways, thus Figs. 1 and 2
of the drawing accompanying my Provisional Specification shew respectively an
clevation and a sectional plan of an arrangement in which the shifting of the

page_text: valve lever is effected by mounting its fulcrum con excentric bearings, so
that by turning these through a certain angle by means of a handle c¹ or other
appliance the front end of the lever with the contact roller d is moved from the
position shown in full lines at Fig. 2 into that shewn in dotted lines.
For ordinary working the lever bis situated in the position shewn in full
lines at Fig. 2 in which it can only be acted upon by the ordinary cam surface f
on the disc came for opening the valve during the suction stroke and not by
the lower cam surface y situated behind f, the lever 6 will consequently effect the
closing of the valve a as soon as the cam surface f has left the roller d this
being open in the position I shewn at Fig. 3, which represents a development of
the came travelling in the direction of the arrow, O being the position of the
roller d before being acted upon by cam surface f.
If now the excentric bearing c of lever be turned through 90° so as to bring
the pivot of the lever nearer to the plane of the disc came the lever b will be
made to assume the position shewn in dotted lines in Fig. 2, by which the
roller will be brought into the path of the supplemental cam surface g, so
that after the cam surface f has left the roller d this and its lever will still be
made to hold the valve a open by the cam surface g until this has left the roller
so that this can then come into the position II Fig. 3.
The above described action of the excentric bearings of lever 6 will be readily
seen from the diagrammatic view of the parts at Fig. 4.
The shifting of the pivot or fulcrum of lever b can of course be effected in
various other ways; thus, for example shewn at Fig. 5, the lever may be
mounted with a slotted opening on the rectangular part of pivot-bolt e, the ends
of which are pivotally mounted in the supporting bracket, so that by means of
a screw turned by a handle the lever can be shifted relatively to the pivot
in order to bring the roller in the path of the supplemental cam gas before.
Or, according to another arrangement shown at Fig. 6, instead of shifting the
lever relatively to its fulcrum, the end of the lever which acts upon the stem
of the valve a can be provided with an adjustable screw stud by turning which,
that end of the lever can be moved farther away from the valve, and consequently
the roller be brought into the path of the supplemental cam surface j.
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 valve mechanism for gas and oil motor engines, arranging the valve actuat-
ing lever in such manner that it can be shifted relatively to the actuating cam
so as to be acted upon either by the ordinary cam surface only or both by this
and by a supplemental cam surface, whereby the opening or closing period of
the valve will be varied, substantially as described.
Daded this 30th day of March 1900.