IMPROVEMENTS IN OR PERTAINING TO SLIDE VALVES AND MEANS FOR ACTUATING THE SAME
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, JOHN COLE CHAPMAN (of the firm of Chapman and Reed) of 29 Victor Road
Holloway in the County of Middlesex, Engineer, do hereby declare the nature
of said invention for "IMPROVEMENTS IN OR PERTAINING TO SLIDE VALVES AND
MEANS FOR ACTUATING THE SAME" to be as follows:
This invention relates to the arrangement of and means for actuating slide valves
of steam and other fluid pressure motor engines working expansively; and in
describing the nature of my invention I will for the sake of clearness assume the
motive fluid employed to be steam.
In or upon each cylinder cover I provide a chest in which are arranged two flát
slide valves formed with ports and connected by links. These valves move over
corresponding faces on the cylinder covers, one for the admission of steam and the
other for the exhaust. The above mentioned steam chests and the top pipe of the
cylinder are constantly supplied (when the engine is at work) with steam at
approximately full pressure, and the exhaust is conducted through a separate
channel beneath the cylinder.
The slide valves are actuated in the following manner. With the crank shaft is
geared another shaft carrying near its further end two fixed cams corresponding
with the valve rods and giving constant lead to the valves. On the same shaft is
a tube having the expansion cams secured thereto: This tube is free to turn
through one-third of a revolution over the before named cam shaft and constantly
revolves with it, but is able to advance or recede when operated by the action of
the governor which alters the grade of the expansion as follows:-
On the governor spindle are two mitre wheels with spiral grooves respectively
right and left handed; these work (as the governor rises and falls) on a corre
sponding screw on the spindle, when the wheels turn in opposite directions one
third of a revolution. The said wheela are geared to two corresponding wheels, one
on the shaft with the constant cams and the other on the tube (outside the shaft)
Price 6d1

page_text: carrying the expansion cams which are advanced as the governor rises and recede
as it falls.
A regulator may be provided so that the grade of the expansion can be shifted
sooner or later in the stroke, leaving the range of the governor expansion the same,
viz through two thirds of any part of the cylinder.
COMPLETE SPECIFICATION.
I, JOHN COLE CHAPMAN, (of the firm of Chapman and Reed) of 29 Victor Road,
Holloway; in the County of Middlesex, Engineer, do hereby declare the nature
of my invention for "IMPROVEMENTS IN OR PERTAINING TO SLIDE VALVES AND 1
MEANS FOR ACTUATING THE SAME" 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 the arrangement of and means for actuating slide valves
of steam and other fluid pressure motor engines working expansively, and in
describing the nature of my invention I will for the sake of clearness assumo the
motive fluid employed to be steam.
In or upon each cylinder cover I provide a chest in which are arranged two flat
Blide valves formed with ports and connected as heroinafter described. These
valves move over corresponding faces on the cylinder covers, one for the admission
of steain and the other for the exhaust. The above-mentioned steam chests.and
the top pipe of the cylinder are constantly supplied (when the engine is at work)
with steam at approximately full pressuro, and the exhaust is conducted through a
separate channel beneath the cylinder.
With the crank shaft.is
The slide valves are actuated in the following manner.
geared another shaft carrying near its further end two fixed cams corresponding
with the valve rods and giving constant lead to the valves. On the same shaft is
a tube having the expansion cams secured thereto.: This tube is free to turn
through one third of a revolution over the before named cam shaft and constantly

page_text: W. LLOYD WISE,
Applicant's Agent.