IMPROVEMENTS IN SLIDE VALVES FOR STEAM AND OTHER ENGINES
Year: 1876

page_text: LETTERS PATENT to Thomas Blinkhorn and Bryan Browning, both of Winsover
Road, Spalding, in the County of Lincoln, Engineers, for the Invention of
"IMPROVEMENTS IN SLIDE VALVES FOR STEAM AND OTHER ENGINES."
aled the 28th October 1876, and dated the 5th May 1876.
PROVISIONAL SPECIFICATION left by the said Thomas Blinkhorn and Bryan
Browning at the Office of the Commissioners of Patents on the 5th May 1876.
THOMAS BLINKHORN and BRYAN BROWNING, both of Winsover Road, Spalding,
in the County of Lincoln, Engineers. "IMPROVEMENTS IN SLIDE VALVES FOR
STEAM AND OTHER ENGINES."
This Invention has for its object improvements in slide valves for steam and
other engines.
In order that the amount of expansion may be controlled by the governor in a
more simple and convenient way than heretofore we employ a slide valve of a
cylindrical form working within a chamber of corresponding shape, in the interior
of which on the side are formed the steam ports by which the steam passes to the
cylinder, and the exhaust port is between the steam ports. The steain enters at
the end of the cylindrical valve, which is furnished with similar ports, and the
steam ports both in the valve and in the valve face are formed in an inclined or
spiral direction around the cylinder. The valve always receives the same amount
of throw from an eccentric, or in other convenient way, and there is an arm on the
valve rod which is actuated by the governor when the velocity of the engine varies.
Thus the governor operates to turn the valve partly round in one direction or the
other, and in consequence of the inclined direction of the ports the valve is so
caused to cut off the steam sooner or later in its travel according as it is turned in
one direction or the other. In some engines the valve may be controlled by hand
in place of automatically.
-
These arrangements are applicable not only to steam engines but to other motive-
power engines in which an clastic fluid is worked.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said Thomas Blinkhorn and Bryan Browning, in the Great Seal Patent Office on
the 3rd November 1876.
THOMAS BLINKHORN, and BRYAN BROWNING, both of Winsoever Road, Spalding,
in the County of Lincoln, Engineers. "IMPROVEMENTS IN SLIDE VALVES FOR
STEAM AND OTHER ENGINES."
This Invention has for its object improvements in slide valves for steam and
other engines.
In order that the amount of expansion may be controlled by the governor in a
more simple and convenient way than heretofore we employ a slide valve of a
cylindrical form, working within a chamber of corresponding shape, in the interior
of which on the side are formed the steam ports by which the steam passes to
the cylinder, and the exhaust port is between the steam ports. The steam enters at
the end of the cylindrical valve, which is furnished with similar ports, and the
steam ports both in the valve and in the valve face are formed in an inclined or
spiral direction around the cylinder. The valve always receives the same amount
of throw from an eccentric, or in other convenient way, and there is an arm on the
valve rod which is actuated by the governor when the velocity of the engine varies.
Thus the governor operates to turn the valve partly round in one direction or the
other, and in consequence of the inclined direction of the ports the valve is so
caused to cut off the steam sooner or later in its travel, according as it is turned in
one direction or the other. In some engines the valve may be controlled by hand
in place of automatically.
These arrangements are applicable not only to steam engines but to other motive
power engines in which an elastic fluid is worked.
In order that our said Invention may be most fully understood and readily carried
into effect, we will proceed to describe the Drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a plan of the apparatus. a is the crank shaft of the engine; b is an
eccentric fixed upon it; c is the eccentric rod which at d is coupled with the valve
rode in such manner that the valve rod is capable of turning. The valve rod is
square and slides through a sleeve which is held between the fixed jaws g, J, and
by an arm or quadrant is connected with the governor, or in some cases the arm
may be used as a handle and operated by hand; i is the valve case, it is shown
partly in section at Figure 2, and in this view the valve is removed to expose the
ports, which as will be seen are cut in inclined directions; j,j, are the steam ports,
and is the exhaust port of valve case. Figure 3 is a side elevation of the valve.
Figure is a front elevation, Figure 5 a longitudinal section, and Figure 6 a trans-
verse section of the same. In some cases we make the valve longer and with the
steam ports at the ends of it complete as is represented at Figure 7, which is a front
elevation. The steam or other clastic fluid to work the engine is admitted at the
end of the valve chamber or case. By turning the valve partly round within its
chamber or case an earlier or later cut off is obtained.
Having thus described the nature of our said Invention and the manner of per-
forming the same, we would have it understood that we claim, the construction and
arrangement substantially as described of the slide valves of steam or other engines
in which an clastic fluid is employed to rotate a shaft.
In witness whereof, 1, the said Thomas Blinkhorn, have hereunto set my hand
and seal, this First day of November, in the year of our Lord One thousand
aight hundred and seventy-six.
THOMAS BLINKHORN. (L.S.)