IMPROVEMENTS IN DIRECT-ACTING DOUBLE- ACTION STEAM PUMPS
Year: 1867

page_text: PROVISIONAL SPECIFICATION left by William Walker and Edward Holt
at the Office of the Commissioners of Patents, with their Petition, on
the 21st December 1867.
We, WILLIAM WALKER, of Rochdale, in the County of Lancaster, and
EDWARD HOLT, of Newton Heath, in the same County, do hereby declare the
nature of the said Invention for "IMPROVEMENTS IN DIRECT-ACTING DOUBLE-
ACTION STEAM PUMPS," to be as follows:-
We employ a horizontal steam cylinder and pump barrel cast to a founda-
tion plate, and connect together the piston of the cylinder and plunger of the.
pump and also the steam slide and water valves. The body of the piston and
piston rod are of one piece, and the rod is of enlarged diameter, so that there:
can be an internal bore in the piston and rod for about the length of the
stroke. In this bore we place a small piston, the rod of which passes through
the main piston and one of the covers of the cylinder, and is jointed to one
arm of a two-armed lever, the other arm of which is jointed to the slide rod,
and in the bore of the piston is fixed á ring or plate encircling the small
piston rod. As the piston is arriving to one end of its stroke the ring or plate.
comes in contact with and gives motion to the small piston so as to give
motion to the two-armed lever and give one traverse.to the slide, and when
the piston is arriving to the other end of its stroke the bottom of the internal
bore acts on the small piston and gives reverse motion to the two-armed lever
for causing the slide to travel in the reverse direction, and thus a reciprocating
motion is given to the steam and water valves without the ordinary eccentri

page_text: or tappets. Steam is allowed to enter the before-mentioned internal bore to
act as a cushion and prevent the overrunning of the steam and water valves.
In another arrangement we connect to a piston rod of the ordinary
diameter a collar carrying a bowl, and maintain the collar in its proper
position by means of a guide. Between the slide rod and bowl there is a
three-armed lever having one of its arms linked to the slide rod, and the
other two arms curved at their ends. When the piston rod moves in one
direction the bowl acts on one curved end and gives one motion to the slide,
and when the piston rod moves in the other direction the bowl acts on the
other curved end and gives the reverse motion to the slide.
In another arrangement we connect to the piston rod, by means of a link,
a rod carrying a pin placed in a slot in a long arm connected to a double
lever, having one arm linked to the slide valve so that when the rod and pin
move to and fro with the piston rod the pin shall move the long arm and
double lever and give the to-and-fro motion to the slide valve. When
convenient the pin may be attached to the piston rod itself and work in the
slot of a shorter arm for giving motion to the double lever and slide rod. We
employ a pump barrel having passages similar to those of the steam cylinder
and cover and uncover the ports by means of a cylindrical valve working in a
cylindrical valve box and connected to the slide rod. The valve has a
passage through the interior and another passage in its periphery, the internal
passage corresponding with the feed ports and supply pipe, and the external
passage with the eduction port and exit pipe, and through the valve below
the internal passage there is a small passage corresponding with both feed
ports when the valve is passing over them for the purpose of preventing the
choking of the water. When the pump is at work the valve opens one feed
passage and the supply water rushes into the vacuum, and at the return stroke
is forced through the eduction passage and exit pipe, and similar operations
take place when by the motion of the valve the other feed passage is opened;
or instead of the small passage for preventing choking we form small
passages at each end of the valve and employ discs of india-rubber or metal
to act as valves by the pressure of the water on one side and the vacuum on
the other side.
Our improved steam pumps can be employed for blowing and exhausting
purposes for gases and liquids of all descriptions.