Improvements in Exhausting Apparatus.
Year: 1890

page_text: Date of Application, 26th Aug., 1890-Accepted, 22nd Nov., 1890
COMPLETE SPECIFICATION.
Improvements in Exhausting Apparatus.
A communication from GEORGE REYNOLDS CASE, of Hartford, County Hartford,
Connecticut, United States of America.
1, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I.M.E., 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:-
The invention relates to the class of devices for reducing the density of or wholly
withdrawing gases, as air, to form a partial or complete vacuum in a vessel, by the
rapid flow of a fluid, as air or water, and the object is to construct a simple and cheap
device which can be attached to any suitable fluid supply an more rapidly and
economically remove a large quantity of gas from a single or a battery of vessels, than
prior pumps of this class.
Referring to the accompanying drawings ;-
Fig. 1 is a top view of the pump.
Fig. 2 is a side elevation with parts cut away to show the interior.
Fig. 3 is a vertical transverse section of the pump.
Fig. 4 is a plan view of a modified form of pump.
Fig. 5 is a vertical central section of the latter form.
In the views the letter a indicates the body of the pump which is preferably cast
from a non-oxidizable or non-corrosive metal with a central vertical opening b, and
air chambers c which open through the bottom of the body by a very thin and narrow
slit or crack d that is equidistant or parallel with the lower edge of the opening b.
C
The lower surface of the body between the lower edge of the opening b and slit d
projects slightly further downward than the remaining portion so as to form a shoulder
or ledge e along the edge of the slit. Any desired number of nipples or tubes f may
be connected to the body so as to open into the chambers c.
In the form of pump
shown in Figs. 1, 2 and 3, the body is somewhat longer than it is wide, and the
vertical opening extends nearly the entire length of the body and is covered on top
by a plate g provided with a hub h that opens into the opening 6 through the plate
which is secured to the body.
с
A bottom or deflecting plate i is held a slight distance from the bottom of the body
either by means of bolts or threaded screws that pass through perforations in projec-
tions from the body and plate, bearing clamp nuts which screw upon the bolts, or, if
the body is circular as shown in Figs. 4 and 5, the periphery of the body may be
threaded and screwed into a threaded annular rim which is secured to the bottom
plate . In this latter form the air chamber c is annular and the air slit d is circular
being concentric with the opening b, while in the first form the slit d is longitudinal
and parallel with the edges of the opening b, and the bottom plate is provided with a
central longitudinal upward projecting diaphragm or partition k which extends into
and divides the opening into two chambers, the upper edge of this partition being
preferably bevelled so as to present but little obstruction to the passage of liquid
through the chambers.
In use the hub h is attached to the fluid supply outlet which fluid may be air, water,
oil, mercury, carbonic acid gas or the like held under suitable pressure to give the
desired velocity when passing through the pump, and the tubes f are joined by any
suitable connections with the vessels from which the gas is to be removed. The fluid
which is utilized to produce the rarefaction as it passes through the hub h and opening b
is deflected at an angle, preferably a right angle, by the bottom plate and passes
out in a thin strata having great velocity through the narrow space left between the
bottom of the body and the top of the plate, and as the fluid under pressure travels

page_text: this narrow outlet in rushing past the slit d an initial vacuum is formed under the
mouth of the slit behind the ledge e a continuation of which exhausts the chambers c
which in turn withdraws the gas from the vessels in which the vacuum is to be
formed.
A battery of tubes may lead into the chambers c and each of the tubes may be
connected to a separate vessel so that a number as a series of electric incandescent
lamps may be exhausted simultaneously or the tubes may lead to a still in which
extracts are being produced.
Having now particularly described and ascertained the nature of the said
invention, as communicated to me by my foreign correspondent, and in what manner
the same is to be performed, I declare that what I claim is :-
1. An air pump consisting of a body provided with a vertical opening connected with
a supply of rarefaction fluid and having a reduced outlet at an angle to the vertical
opening, an air chamber which opens by a thin slit into the reduced outlet connected
with the vessel to be exhausted.
2. An air pump consisting of a body provided with a vertical longitudinal opening
connected with a supply of rarefaction fluid and having a reduced horizontal outlet a
longitudinal chamber which opens by a thin slit into the reduced horizontal outlet
connected with the vessel to be exhausted.
3. An air pump consisting of a body provided with a central opening connected
with a supply of rarefaction fluid and having a reduced outlet at an angle to the central
opening an annular chamber which opens by a thin slit into the reduced outlet connected
with the vessel to be exhausted.
4. An air pump consisting of a body provided with a central opening connected
with the supply of rarefaction fluid and having reduced outlets at an angle to the
central opening a diaphragm separating the reduced outlets and chambers which open
by thin slits parallel with the central opening into the reduced outlets.
5. An air pump consisting of an annular air drum having an inlet adapted to be
connected with the chamber which is to be exhausted an air outlet encircling the
liquid passage through the drum and an adjustable plate below the drum.
Dated this 26th day of August 1890.
W. P. THOMPSON & BOULT,
Agents for the Applicant.