VALVE GEAR FOR MOTOR ENGINES
Year: 1882

page_text: LETTERS PATENT to Jens Jensen of Fairfield Road Tranmere Birkenhead
in the County of Chester, Engineer, and Charles Wilden King of City
Buildings, Oldhall Street, Liverpool in the County of Lancaster Engineer.
for an Invention of VALVE GEAR FOR MOTOR ENGINES
PROVISIONAL SPECIFICATION left by the said Jens Jensen and Charles
Wilden King at the Office of the Commissioners of Patents on the
3rd February 1882.
JENS JENSEN of Fairfield Rond Tranmere, Birkenhead in the County of
Chester, Engineer, and CHARLES WILDEN KING of City Buildings, Oldhall Street,
Liverpool in the County of Lancaster Engineer. VALVE GEAR OF MOTOR
ENGINES
Our gear is preferably applied to engines with two cylinders but may be used
with single engines, or for three or more cylinders, working simple or compound.
The modifications necessary to adapt it being easily understood by a practical
engineer.
In working with two cylinders we place the valve faces or for piston valves the
axes of the valves at right angles, or at the same angle at which the cranks are set,
the two valves may thus be actuated by the same pin or eccentric. Midway
between the cylinders we place a shaft driven from the crank shaft by mitro
gearing, this shaft passes through a stuffing box into a casing between the
cylinders, which forms the steam space when the engine has ordinary D slides but
which we prefer to make the exhaust space when working with piston valves,
and in compound engines the casing may form a receiver between the cylinders, in
which case the high pressure cylinder would have a piston valve and the low
pressure cylinder an ordinary D-slide.
The valves are both actuated by rods from a single pin which is fixed in a
motion block, working in a dovetail slot in a disc driven by the shaft. The
dovetail slot is cut in the disc at a distance from the centre equal to the lap of the
valve added to the lead, so that when the pin is at one end of the slot it is in

page_text: position for driving ahead, and at the other end of the slot in position for driving
astern; intermediate positions giving varying grades of expansion as required. In
order to slide the pin along the slot in the disc we provide a bell-crank lever
centred on a projection on the disc, one arm of the lever is connected to the slide
carrying the pin by a link or links the other arm to a second disc which revolves
with the shaft but is moveable along it; to move this disc along the shaft it has a
groove or grooves cut in the circumference and a ring fitted in this groove or
grooves, the ring does not revolve but is held by lugs on its circumference fitting
in guides in the sides of the casing, to each lug is fitted a rod passing through a
stuffing box in the casing and connected to a crosshead or nut on the reversing
screw which is on the top or back of the casing and is turned by a handwheel,
The hand wheel forms the reversing wheel of the engine and by turning it, the
sliding pin in the revolving slotted disc is brought into position for going ahead
or astern, intermediate positions giving varying grades of expansion.
connecting the governor of the engine to our gear, we may control the expansion
automatically.
By
In single engines we may place our gear on the end of the crank shaft instead of
in the steain casing, an ordinary slide valve rod being connected to the sliding pin
by a long connecting rod. In this case a radial slide valve might be sometimes
used with advantage.
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page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Jens Jensen and Charles Wilden King in the Great Seal Patent
Office on the 3rd August 1882.
JENS JENSEN of Fairfield Road, Tranmere, Birkenhead, in the County of
Chester, Engineer, and CHARLES, WILDEN KING, Engineer, of City Buildings
Oldhall Street, Liverpool in the County of Lancaster VALVE GEAR OF MOTOR.
ENGINES
Our gear is preferably applied to engines (whether steam or compressed air or
gas) with two cylinders, but may be used with single engines or for three or more
cylinders working simple or compound. The modifications necessary to adapt it
being easily understood by a practical engineer.
In working with two cylinders we place the valve faces or for piston valves the
axes of the valves at right angles or at the same angle at which the cranks are set,
the two valves may thus be actuated by the same pin or eccentric.
Midway between the cylinders we place a shaft driven from the crank shaft by
mitre gearing, this shaft passes through a stuffing box into a casing between the
cylinders, which forms the steam space when the engine has ordinary D-slides,
but which we prefer to make the exhaust space when working with piston valves
and in compound engines the casing may form a receiver between the cylinders in
which case the high pressure cylinder would have a piston valve and the low
pressure cylinder an ordinary D-slide.
i
The valves are both actuated by rods from a single pin which is fixed in a
motion-block working in a dovetail slot in a disc driven by the shaft. Tho
dovetail slot is cut in the disc at a distance from its centre equal to the lap of the
valve added to the lend, so that when the pin is at one end of the slot it is in
position for driving ahead and at the other end of the slot in position for driving
astern, intermediate positions giving varying grades of expansion as required. In
order to slide the pin along the slot in the disc we provide a bell-crank lever
centred on a projection on the disc, one arm of the lever is connected to the slido
carrying the pin by a link or links the other arm to a second disc which revolves
with the shaft but is moveable along it; to move this disc along the shaft it has a
groove or grooves cut in the circumference and a ring fitted in this groove or
grooves the ring does not revolve but is held by lugs on its circumference fitting in
guides on the sides of the casing, to cach lug is fitted a rud passing through a
stuffing-box in the casing and connected to a crosshead or nut on the reversing
screw which is on the top or back of the casing and is turned by a handwheel.
The handwheel forms the reversing wheel of the engine and by turning it, the
sliding pin in the revolving slotted disc is brought into position for going ahead or
astern, intermediate positions giving varying grades of expansion.
By connecting the governor of the engine to our gear we may control the
expansion automatically. In single engines we may place our gear on the end of
the crank shaft instead of in the steam casing, an ordinary slide valve rod being
connected to the sliding pin by a long connecting rod. In this case a radial slide
valve night be sometimes used with advantage.
In order that our Invention may be better understood we have shewn the
application of it to a two cylinder vertical engine for marine or other purposes on
the Sheet of Drawings hereto annexed.
Fig 1. is a horizontal section through the cylinders, Fig 2. a vertical longitudinal
section and Fig. 3. a vertical transverse section of the same. The letters apply to
the same parts in the different Figures.
A and B are the cylinders C is the steam casing between them, in which the
valve gear works. ee are mitre wheels driving the vertical shaft d. this shaft

page_text: .
enters the steam casing by a stuffing box and inside the casing is divided into the
two parts h h connected by the crosshead f, on h, h, slides up and down a disea
of the
connected to the arm of a bell-crank lever by the link the other arm
same is connected by the link o to the slide k in which is the pin l. On the disc
which revolves with the shaft is a collar which is stationary except when
actuated by the screw i through the crosshead nut w and the drag rods n n in
order to vary the expansion or to reverse the engines. The collar gis kept from
revolving by lugs on its circumference sliding in guides shewn in Fig 1 and to
which the rods n n are attached. In this engine the cranks are at right angles so
the valve faces cc are at right angles as shewn in Fig 1. The valves a a are
actuated by rods bb from the same pin l. The upper parts of h h are attached
firmly to the disc m which thus revolves with the shaft.
At a distance from the centre of this disc equal to the lap of the valves added
to the lead, there is cut a dovetail slot in which the slide k containing the pin
works, or if not convenient to cut the slot at this distance the pin must be so
placed on the slide that its distance from the centre of the disc when the slide
is in the centre of its travel is equal to the lap added to the lead as
aforesaid.
When the slide is at one end of the slot as shewn in Fig 1. then the pin is
in position for moving the valves so that the engine goes ahead, when by turning
the handwheel and screw i the slide is moved to the other end of the slot the pin
then becomes in position for going astern intermediate positions giving varying
grades of expansion.
It must be understood that although we have described in reference to the
Drawing the particular modification of our gear suitable for a two cylinder simple
engine with cranks at right angles, yet as before mentioned it can be applied to
compound engines or to one, two, three or more cylinders either by arrangements
as before mentioned or in other ways as will be evident to a practical engineer.
We claim as our Invention:-
1. A valve gear consisting of the disc with slide and pin and the apparatus for
moving the same to give expansion or to stop and reverse, substantially as herein-
before described.
2. In combination with our valve gear, placing the valve faces at the same angle
to one another as the cranks, so that one pin can work both or all valves, substan-
tially as liereinbefore described.
In witness whereof, I the said Jens Jensen on behalf of myself and the said
Charles Wilden King, have hereunto set my hand and seal this Third day
of August in the year of our Lord, One thousand eight hundred and eighty-