Improvements in Air Pumps, such as are Used for Inflating Purposes.
Year: 1895

page_text: Date of Application, 10th Dec., 1895
Complete Specification Left, 10th Sept., 1896-Accepted, 10th Oct., 1896
PROVISIONAL SPECIFICATION.
Improvements in Air Pumps, such as are Used for Inflating
Purposes.
We, HENRY TURNER, 28 Artizan View, Brass Turner, and JOHN ADAM,
19 Pomona Street, Brass Turner, both of Sheffield, in the County of York, do
hereby declare the nature of our invention to be as follows:-
:-
Our invention of improvements in air pumps such as are used for inflating the
pneumatic tyres of cycles, and other vehicles, footballs and the like, and commonly
called inflators, has for its primary object to construct a pump that will fill the
object to be inflated in much less time than those of the ordinary construction.
We propose to combine two pump barrels, say for example one of one inch
diameter and one of two inches diameter, fitted with a communicating valve (or
valves) in such a manner that at each alternate movement of the connected piston
rods, the large volume of air contained in the large barrel will be forced into the
small barrel, and the return movement will force the already compressed air in the
small barrel, into the tyre or other object. We may if desirable instead of arranging
the two barrels side by side, arrange them longitudinally, that is, connect the end
of one to the end of the telescopic handle or piston rod to obtain the desired action,
but we prefer the first named arrangement.
We construct the valve used in these pumps as follows: The seat round the small
hole or exit, is cone shaped or tapered from the hole to the outer edge, and is
prepared upon its periphery to have a cap screwed upon it.
The cap has a larger hole through it which is concentric with the small hole, and
between the seating and the cap we place a thin flat piece of rubber, originally of
circular form, but having segments cut out of its edges for the passage of air,
sufficient of the rubber being left in the centre part to effectually cover the small
hole or exit.
1005
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicants.
improvements in Air Pumps, such as are used for innating
Purposes.
We HENRY TURNER, 28 Artizan View, Brass Turner, and JOHN ADAM,
19 Pomona Street, Brass Turner, both of Sheffield in the County of York do
hereby declare the nature of this invention and in what manner the same has to
be performed, to be particularly described and ascertained in and by the following
statement :-
Our invention of improvements in air pumps such as are used for inflating the
"pneumatic tyres" of cycles and other road vehicles, footballs and the like, and
commonly called inflators, has for its object the more rapid inflation of such tyres
and the like than is possible with those of ordinary construction.

page_text: The annexed drawing illustrates an inflator constructed according to our
invention.
Fig. 1, is an elevation of the inflator.
Fig. 2, plan of cylinders and air tube.
Fig. 3, interior of cylinders showing pistons.
In carrying the invention into practice we use two cylinders or pump barrels A
and B, secured together as shown, A for example, being of one inch diameter,
and B of two inches diameter, (but other proportions may be used if desired).
Each cylinder is provided with a piston rod A2, and B, fitted with a flexible cup
leather A, and B³, which will allow the air to pass it when the piston is moving in
one direction but not when moving in the opposite direction; the cup leather on
one piston rod acts in the opposite direction to the other.
A pipe C, forms an air passage from the top of the cylinder B, to the bottom of
the cylinder A, at which point there is a back pressure valve V', a similar valve V2
is also used at the outlet to the pipe G, which connects the inflator with the object
which is to be inflated.
The two piston rods are connected by a crosshead D, and they are both operated
by the handle E.
+
When the piston rods are drawn out, the piston B2, forces the air contained in
the cylinder B, through the pipe C, and valve V, into the smaller cylinder A, and
on the return stroke the piston A2, forces the already compressed air from the
cylinder A, through the valve V, and the tube G, into the tyre or other object.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
'claim is:
1. An air pump or inflator constructed and operating in the manner as herein-
before described and shown.
2. An inflator having two cylinders of different diameters A & B, and communi-
cating by means of a pipe C, so arranged that the alternate movements of the
connected pistons A2 & B32, will force the air out of the large cylinder into the
small one, and from that into the article to be inflated, as hereinbefore described
and set forth.
Dated the 7th day of September 1896.
ROBT. F. DRURY, C.P.A.,
Agent for the Applicants.