Improved Valve-gear, with Mechanism for Throwing out of Gear.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improved Valve-gear, with Mechanism for Throwing out of Gear.
I, JOHANN STUMPF, of 27, Ranke Strasse, Berlin, in the Kingdom of Prussia,
German Empire, Professor, do hereby declare the nature of this invention to be
as follows:
My invention relates to an improved valve-gear with mechanism for throwing
out of gear which in spite of its great simplicity allows of large admission'
periods. The lever for throwing out of gear is actuated by a cam moved by an
eccentric influenced by the shaft governor. This shaft governor acts upon the
eccentric governing the cam and makes it possible that either the stroke and
the lead of the valve or only the lead can be altered.
Instead of the shaft
governor, an ordinary governor might also be employed. In the latter case a
constant movement is not imparted to the cam by an eccentric but the cam is
merely adjusted by the governor according to the degree of admission required.
In order to make my invention more clear, I refer to the accom-
panying drawing, in which a valve gear is illustrated in combination with an
inlet valve of a steam cylinder. The valve spindle a engages with a doublé
lever bc movable round a bolt d arranged within the valve e.
Upon the
bolt is fixed a lever f having a cross-bolt fl engaging with an eccentric rod h
actuated by an eccentric h¹ upon the gear shaft i. Upon the cross, bolt fi is
fixed a crank lever g k, the leg g of which is provided with a nose g¹ taking
behind the leg c of the double lever b c. The other leg rests upon a cam l,
the arm m of which is connected with a second eccentric o upon the shaft i, by
means of a connecting rod n. This latter eccentric is in connection with a shaft
governor indicated in by the dotted circle. The nose g¹ of the angle lever
caused by this arrangement to act upon the leg of the double lever bc to
cause it to swing outwardly.
k is
The leg lifts the valve-spindle a to open the valve. During this movement
the leg of the crank lever gk slides upon the cam / oscillated by the eccen-
tric o.
As soon as the leg has reached the highest point of the cam, it turns
round the bolt f', so that the nose g¹ liberates the crank lever bc, thereby causing
the throwing out of the gear. The valve closes in known manner under influence
of any known closing power. According to the adjustment of the eccentric o by
means of the shaft governor p, the crank leyer gk reaches the highest point of
said cam earlier or later and consequently according to the necessary degree of
admission the valve earlier or later is opened.
If instead of the shaft governor an ordinary governor is employed, no constant
oscillating movement is imparted to the cam but the latter is altered in position
directly by the governor. When an ordinary governor is employed the advan-
tage of the simple impelling mechanism offered by the shaft governor, naturally
cannot be obtained.
In a double acting steam engine the shaft governor displaces simultaneously
two eccentrics, each one driving a lever on the fore- or backside of the steam-

page_text: cylinder, and which naturally must be displaced against one another for 180°. With
the valve gear described admissions up to 95% are possible to be obtained,
which with most valve gears hitherto emploved are impossible. Owing to the
great simplicity of the gear it can be employed with great safety.
Dated this 22nd day of December 1899.
GEO. H. RAYNER,
37, Chancery Lane, London, Agent for the Applicant.
Improved Valve-gear, with Mechanism for Throwing out of Gear.
I, JOHANN STUMPF, of 27, Ranke Strasse, Berlin, in the Kingdom of Prussia,
German Empire, Professor, 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 an improved valve-gear. with mechanism for throwing
out of gear which in spite of its great simplicity. allows of large admission
periods. The lever for throwing out of gear is actuated by a cam moved by an
eccentric influenced by the shaft governor. This shaft governor acts upon the
eccentric governing the cam and makes it possible that either the stroke and
the lead of the valve or only the lead can be altered. Instead of the shaft
governor, an ordinary governor might also be employed. In the latter case a
constant movement is not imparted to the cam by an eccentric but the cam is
merely adjusted by the governor according to the degree of admission required.
In order to make my invention more clear, I refer to the drawing filed with my
Provisional Application, in which a valve-gear is illustrated in combination with
an inlet valve of a steam cylinder. The valve spindle a engages with a double
lever bc movable round a bolt d arranged within the valve bonnet e.
Upon the
bolt d is fixed a lever f having a cross-bolt f' engaging with an eccentric rod h
actuated by an eccentric h¹ upon the gear shaft i. Upon the cross bolt fis
fixed a crank lever gk, the leg g of which is provided with a nose g¹ taking
behind the leg c of the double lever b The other legk rests upon a cam l,
the arm m of which is connected with a second eccentric o upon the shaft i, by
means of a connecting rod n. This latter eccentric is in connection with a shaft
governor indicated by the dotted circle. The nose g¹ of the angle lever
caused by this arrangement to act upon the leg of the double lever to
'cause it to swing outwardly.
C.
k is
The leg lifts the valve-spindle a to open the valve. During this movement
the leg of the crank lever g k slides upon the camoscillated by the eccen-
tric o.
As soon as the leg has reached the highest point of the cam, it turns
round the bolt f¹, so that the nose gliberates the crank lever bc, thereby causing
the throwing out of the gear. The valve closes in known manner under influence
of any known closing power. According to the adjustment of the eccentric o by
means of the shaft governor p, the crank lever gk reaches the highest point of
said cam earlier or later and consequently according to the necessary degree of
admission the valve earlier or later is closed.
If instead of the shaft governor an ordinary governor is employed, no constant
oscillating movement is imparted to the cam but the latter is altered in position
directly by the governor. When an ordinary governor is employed the advan-
tage of the simple impelling mechanism offered by the shaft governor, naturally
cannot be obtained.

page_text: In a double acting steam engine the shaft governor displaces simultaneously
two eccentrics, each one driving a lever on the fore- or backside of the steam-
cylinder, and which naturally must be displaced against one another for 180 degrees.
With the valve gear described admissions up to 95 degrees are possible to be
obtained, which with most valve gears hitherto employed are impossible. Owing
to the great simplicity of the gear it can be employed with great safety.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, what I desire to
claim is:-
1. In valve gears, the combination with a mechanism for throwing out of gear,
actuated by two eccentrics, one of which is controlled by the shaft governor, for
the purpose as described.
2. In a mechanism for throwing out of gear, as per Claim 1, the combination
with an ordinary governor adjusting a regulating and throwing out of gear,
substantially as described.
GEO. H. RAYNER,
37, Chancery Lane, London, Agent for the Applicant.