Admission and Exhaust Valve, and Valve Driving Mechanism, for Steam Engines.
Year: 1896

page_text: Date of Application, 4th Mar., 1896
Complete Specification Left, 4th Dec.. 1896-Accepted, 13th Feb.. 1897
PROVISIONAL SPECIFICATION.
Admission and Exhaust Valve, and Valve Driving Mechanism, for
Steam Engines.
FRANK FARNWORTH 108 Bolton Road Ramsbottom near Manchester Engineer
do hereby declare the nature of this invention to be as follows:-
The admission & exhaust valve A Figs. 1, 2, & 3 to be cylindrical in form, the
outside being turned, for a certain length at each end, to work in corresponding
bored valve chest B, cast on side of steam cylinder C. The inside of valve A to
be hollow, forming the steam chamber D, open at the back end, for the admission
of steam through the steam pipe E, the front end of valve A having spindle F
secured in, for rotating same the spindle, or shaft F passing through front valve
chest cover G.
Round the periphery of valve A at each end, are arranged the steam ports H H¹
& the exhaust ports II', for admission to, & exhaustion of steam from the
cylinder C.
The steam port H, & exhaust port I, at front end of valve, to be diametrically
opposite the steam port H', & exhaust port I at back of valve.
The valve A is made to rotate in the valve chest B, at exactly the same number
of revolutions as the crank shaft O, by means of a pair of mitre wheels N, N', the
wheel N being keyed on the engine crank shaft O, & engaging in the wheel N¹,
keyed on the valve shaft P, this shaft to be coupled up to valve spindle F, by
means of coupling Q.
During one complete revolution of the valve A the steam port H, & exhaust
port 1, are respectively brought in contact with port J, for admission & exhaustion
of steam from front end of cylinder, & also the steam port H' & exhaust port 11
at back end of valve are brought in contact with port J', for admission & exhaustion
of steam from back end of cylinder C.
Fig. 2 shews the valve A in a position for the admission of steam, to the front
of piston & for the exhaustion of steam from the back of piston, the exhaust steam
passing through the port I into exhaust chamber L & out through exhaust
pipe M.
For preference, instead of valve A being coupled direct to shaft P with
coupling Q as above described, the spindle F may be driven off the shaft P by
means of a pair of spur wheels R, R', the valve A under any conditions to revolve
at the same number of revolutions as the engine crank shaft.
Dated this Third day of March 1896
FRANK FARNWORTH.
COMPLETE SPECIFICATION.
Admission and Exhaust Valve, and Valve Driving Mechanism, for
Steam Engines.
FRANK FARNWORTH 108 Bolton Road Ramsbottom near Manchester 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 :-
This invention relates to an admission & exhaust valve, & valve driving

page_text: mechanism, for steam engines. This valve A, Figs. 1, 2 & 3, of drawings filed
with my Provisional Specification to be cylindrical in form, the outside being
turned for a certain length at each end, to work in corresponding bored valve
chest B, cast on side of steam cylinder C. The inside of valve A to be hollow
forming the steam chamber D, open at the back end for the admission of steam,
through the steam pipe E, the front end of valve A having spindle F secured in
for rotating same, the spindle, or shaft F passing through front valve chest cover G.
Round the periphery of valve A at each end are arranged the steam ports H, H',
& the exhaust ports I, I', for admission to & exhaustion of steam from the
cylinder.
The steam port H, & exhaust port I, at front end of valve, to be diametrically
opposite the steam port H, & exhaust port I', at back of valve. The valve is
made to revolve in the valve chest B, at exactly the same number of revolutions as
the crank shaft O, by means of a pair of mitre wheels N, N¹, the wheel N, being
keyed on the engine crank shaft O, & engaging in the wheel N¹, keyed on the
valve shaft P, this shaft to be coupled up to valve spindle F, by means of
coupling Q. During one complete revolution of the valve A, the steam port H,
& exhaust port I, are respectively brought in contact with port J, for admission &
exhaustion of steam from front end of cylinder, & also the steam port H, & exhaust
port I', at back end of valve, are brought in contact with port J, for admission &
exhaustion of steam from back end of cylinder C. Fig. 2, of drawings filed with my
Provisional Specification, shews the valve A in a position for the admission of steam
to the front of piston, & for the exhaustion of steam from the back of piston, in
cylinder C, the exhaust steam passing through the port I, into exhaust chamber L,
& out through exhaust pipe M. For preference, instead of valve A being coupled
direct to shaft P, with coupling Q, as above described, the spindle F may be driven
off the shaft P, by means of a pair of spur wheels R R', the valve A under any
conditions to revolve at the same number of revolutions as the engine crank shaft.
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
1. A hollow cylindrical admission & exhaust valve for steam engines, made to
revolve in suitably prepared valve chest, in a direction at right angles to the piston
stroke, & having ports arranged round the periphery of said valve, in such a
manner that steam is admitted to & exhausted from both ends of cylinder during
the requisite periods & at requisite intervals as described.
2. The mechanism for driving same, to consist of mitre wheels, driven off engine
crank shaft, & connected with shaft, coupled up to, or driving by means of spur
wheels, (as preferred) the valve spindle secured in said admission & exhaust valve,
as described.
Dated this Third day of December 1896.
FRANK FARNWORTH.