The Federal Reporter (Annotated), Volume 174: Cases Argued and Determined in the Circuit Courts of Appeals and Circuit and District Courts of the United States. January-March, 1910. Page: 154
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15 '' 174' FEDERAL REPORTER.
In Fig. 1, the exhauster, 2, is at the end of the looped line of tubing,
1, most remote from the end provided with the terminal air-inlet, 3.
Dispatch inlets-that is, inlets where carriers are inserted in the hne
-are represented at 20, each having a door, 24; and discharge out-
lets-that is, outlets where the carriers are discharged from the line
-are represented at 22, each having a door, 26. Each of the doors
to these inlets and outlets is closed 'by a spring. Door 24 is opened
manually or otherwise when a carrier is inserted, and door 26 is opened
by the impact of the discharging carrier. Door 24 is closed imme-
diately after the carrier is inserted, and door 26 immediately after it
is discharged. It will be observed, then, that during the whole of the
time the line is not in service it is closed between the exhauster, 2, at
one end, and the air-inlet, 3, at the other end. Assuming the ex-
hauster not to be in operation, and the air in the line of tubing not
to have been to any extent drawn from it, the ball-valve, 10 (which
is connected by a rod with a perforated piston head as shown in
cylinder 4 of Fig. 2 and in Fig. 3), occupies a position below the coni-
cal valve-seat, 8. If the exhauster, 2, be now put into operation, it
draws the air from the tubing, 1, to such an extent as to produce a
partial vacuum therein. The piston head in cylinder 4 is thereupon
forced up by the pressure of the air passing into the lower part of
the cjlinder through the conical valve-seat, 8, and ball-valve 10 is
thereby lifted to its seat in 8. In this manner air-inlet 3 is closed, and
it remains closed so long as exhauster 2 keeps the air in the tubing
sufficiently rarified to enable the external pressure to hold 10 in its
seat, 8. Now, if door 24 be opened, air will be admitted to the line
through the door, and valve 10 will immediately drop by gravity. If
a carrier be then inserted at 24, and the door closed behind the car-
rier, air will be admitted to the line through the air-inlet at 8, and'
the perforated piston head in cylinder 4. The perforated piston head
is provided with a damper, shown in Fig. 3, by which the admission
of air into the line may be regulated. As the exhauster, 2, exhausts
the air in front of the carrier, the carrier is forced through the line
by the pressure of the air behind it until its discharge at 26. When
the carrier is discharged at 26, the door at 26 being immediately closed
after the discharge by means of a spring or otherwise, exhauster 2,
no longer required to overcome the added resistance of a carrier in
the line, exhausts the air from the line to an extent sufficient to cause
valve 10 again to take its seat in 8, and thus to close the system until
another carrier is inserted. With this brief description the two claims
of the patent will, perhaps, be understood. They are:
"1. A vacuo dispatch system, characterized by the combination of a line of
tubing, an exhauster operatively connected therewith, and a terminal air-
inlet having a closure, which automatically shuts the air-inlet when no carrier
is being dispatched and automatically opens same when a carrier is being
dispatched, substantially as described.
"2. The combination in a vacuo dispatch system of a line of tubing, an ex-
hauster operatively connected therewith, dispatch inlets and discharge out-
lets normally closed, and a terminal air-inlet on said line, remote from said
exhauster, provided with a closure which is arranged to automatically shut
the said terminal air-inlet when no carrier is being dispatched and auto-
matically open it when a carrier is being dispatched, substantially as de-
scribed."
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The Federal Reporter (Annotated), Volume 174: Cases Argued and Determined in the Circuit Courts of Appeals and Circuit and District Courts of the United States. January-March, 1910., legislative document, 1910; Saint Paul, Minnesota. (https://digital.library.unt.edu/ark:/67531/metadc38220/m1/166/: accessed May 7, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.