Year: 1891

page_text: Date of Application (in United Kingdom), 8th Dec., 1891
Complete Specification Left, 8th Dec., 1891-Accepted, 12th Mar., 1832

page_text: discharge-chamber D, with valves E of suitable construction and with the outlet d.
As shown in Figs. 1, 2, 3, and 5 these discharge-chambers are arranged on opposite
sides of the four working chambers A and A', so that the latter may be close
together to permit their upper ends to be brought close together at the top for
control by the one steam-valve V. There is also in connection with each
induction-chamber I a vacuum-chamber C, Fig. 2, provided with an air-valve C¹,
and opening into the induction-chamber I (or I¹) below the valves at the lower
ends of the working chambers A. (or A').
In order to keep the upper part of the working chambers A and A' cool, I utilize
the space K, Fig. 2, between the upper parts of these chambers as a water-passage
for the discharge, and for this purpose I carry the branches F F¹, Figs. 1 and 3,
from the outlets d of the discharge-chambers D to one side of this chamber K and
have one outlet-pipe L, Fig. 3, from the other side of this chamber K.
As I have said, the valves B B' and E E' and J J may be of any suitable
construction; but for the valves B B and J J¹, I prefer to use the form
illustrated, and consisting of a seat 5, a flexible flat valve 6, and a retaining-guard 7.
The seats 5 are adapted to suitable recesses in the casing, and the guards and valves
are held in place on the seat by means of rods 8, bearing upon the guards at their
inner ends, and threaded near their outer ends, where each is screwed into a
threaded opening in the casing. Jam-nuts 9 may be employed where desired. In
order to conveniently get at these various valves, suitable cover-plates are used,
such as the plates 18, for the two sets of chambers A and A', the plates 12 for the
discharge-chambers D and D', and the plates 13 for the induction-chambers I and I'.
Instead of securing these cover-plates in place each by a number of bolts and nuts
fitted into notches in the edges of the meeting-flanges I cast inside the flanges of
each chamber where the cover-plates are to be applied recesses 14, into which can
be fitted the ends of cross-bars 15, having headed bolts 16, (see Figs. 3, 6, and 7,)
which are passed through openings in the cover-plates and tightened and held by
means of suitable nuts 17.
The operation of the apparatus will be readily understood from the foregoing
description, it being borne in mind simply that inasmuch as there is one steam-inlet
to both sets of chambers they both work at the same time, and thereby greatly
increase the capacity of the machine.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. A duplex automatic steam vacuum-pump having one steam-inlet valve and
valve-chamber and two sets of working chambers, all close together, and having
their upper ends all opening into the one valve-chamber at the top, in combination
with two discharge-chambers on opposite sides of the working chamber and two sets
of induction-chambers and valves, all substantially as described.
2. A duplex automatic steam vacuum-pump having two sets of working chambers
with valves, two induction-chambers with valves, and two valved discharge-chambers
with pipes from the discharge-chambers opening into a space between the upper
parts of the working chambers, and an outlet-pipe from said space, substantially as
and for the purpose described.
3. An automatic steam vacuum-pump having valves and cover-plates on the
casing for access to the valves, the corresponding flanged part of the casing having
recesses 14, a bar 15 to engage with the recesses, and a headed bolt passing through
the bar and the cover-plate, and nuts to secure the latter in place, all substantially
as described.
Dated this 8th day of December 1891
F. W. BARKER,
Applicant's Agent.