Automatically Controlling the Inrush of Air into Pneumatic Despatch Tubes.
Year: 1886

page_text: Date of Application, 22nd Apr., 1886.
Complete Left, 12th Jan., 1887.
Complete Accepted, 15th Feb., 1887.
PROVISIONAL SPECIFICATION.
Automatically Controlling the Inrush of Air into Pneumatic
Despatch Tubes.
JOHN GEORGE WALKER Gallowgate Iron Works, Newcastle-on-Tyne, Ironfounder,
JOHN NEWTON Gallowgate Iron Works, Newcastle-on-Tyne, Foreman, do hereby
declare the nature of our invention for AUTOMATICALLY CONTROLLING THE INRUSH OF
AIR INTO PNEUMATIC DESPATCH TUBES to be as follows :-
A contrivance made of brass or other metal & consisting of a barrel (A) with hole
through centre (B), attached by arms (C. C.) to a door or shutter (D), which
when closed by the operator turns the hole (B) into a direct line with the bore of the
despatch tube (E), at the same time admitting an inrush of air from the supply
tube (F), by means of which the carrier is blown to its destination at the other end of
the despatch tube. Immediately on the removal of the hand of the operator from the
door or shutter it falls by the action of a spring of india rubber (G) or other material,
automatically closing the valve & preventing any further access of air.
JOHN GEORGE WALKER.
JOHN NEWTON.

page_text: The
of the tube A are formed ports or passages e¹ el. A cylindrical plug or barrel is
fitted to turn freely within the casing e and the said plug has a port or passage ea
through it, which can be turned in line with the passages e, e' in the casing e.
said plug is cored out as shown in the drawing to render it light. One end of the
plug is formed with a head et which projects beyond the circumference of the plug,
forming a flange es. The head et has a central square e projecting therefrom, and a
corresponding square e' is formed on the other end of the plug. The body of the plug
or barrel e is of the same length as the casing e so that when it is inserted in the
said casing the flange e closes one end of the casing, the other end of the casing being
closed by a washer e fitted on the square e' which projects sufficiently to receive the
said washer and also the arm D. The arms D are then fitted upon the squares e°, e7
and secured thereon by the screws eº.
An india-rubber or other suitable spring F is connected in any suitable manner to
the back of the valve or cover C and to the tube A about over the air-valve E. The
said spring is so arranged that it normally keeps the valve or cover C open or away
from the aperture B as shown in figure 1.
The air-valve E and valve or cover Care so connected together by the arms D that
when the valve C is held up against the tube by the operator so as to close the aperture B
the valve E is opened and the supply of air admitted, the spring F being then in a
state of tension. On the valve or cover C being released, the contraction of the
spring F withdraws the valve or cover (from the aperture B into the position shown
in figure 1, which action turns the valve E so as to close it and automatically cut off
the supply of air. The valve or cover C is provided with a handle c for the con-
venience of the operator.
We do not limit ourselves to the use of the valve E as hereinbefore described as any
other suitable form of valve may be used which can be arranged to have a similar
action when combined with and connected to the valvo or cover C as above described.
Having now particularly described and ascertained the nature of our said invention
and in what manner the same is to be performed, we declare that what we claim is
-
First The air-valve E, substantially as and for the purpose herein set forth.
Second-The valve or cover C and valve E or other suitable valve, connected
together by arms D or equivalent means, and the spring F or its equivalent, combined,
arranged and operating substantially as described and illustrated in the accompanying
drawings.
T. N. PALMER & Co.,
Agents for the Applicants.