Improvement in the Construction of Air-pumps or Inflators for the Inflation of Pneumatic Tyres, Footballs, and other' Inflated Articles.
Year: 1892

page_text: Date of Application, 7th Sept., 1892
Complete Specification Left, 31st Dec., 1892-Accepted, 4th. Mar.,
..
1893
"1.
PROVISIONAL SPECIFICATION.
Improvement in the Construction of Air-pumps or Inflators for
the Inflation of Pneumatic Tyres, Footballs, and other'
Inflated Articles.
HERBERT GUEST, Neptune Works, Watery Lane, Sheffield, Manufacturer,
do hereby declare the nature of this invention to be as follows: —
The object of my invention is to obtain a supply of compressed air with each
stroke of the piston or pistons employed, thereby securing a double supply from
the same cylinder or cylinders. For this purpose I construct an inflator or pump
consisting of a cylinder in which works a piston connected by a hollow tube which
serves as the piston rod; the end of which can be connected with the article to be
inflated and serve as the outlet for the air; similar to those pumps now in
ordinary use, to which I make the following additions.
In the cover of each end of the barrel or cylinder I insert valves of suitable
construction which serve as inlets for the air into the barrel. In the end of the
piston rod I also insert a valve to admit and prevent the return of air on the
downward stroke, and in a box or air chamber attached to the said piston.;.I
insert another valve to serve a like purpose on the upward stroke.
Dated this Sixth day of September 1892.
COMPLETE SPECIFICATION.
Improvement in the Construction of Air-pumps or Inflators for
the Inflation of Pneumatic Tyres, Footballs, and other
Inflated Articles.
I, HERBERT GUEST, Neptune Works, Watery Lane, Sheffield, Manufacturer
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:-
This invention relates to improvements in the construction of a class of pocket
or hand air pumps termed inflators, used for the inflation of pneumatic tyres of
bicycles, footballs, and other articles requiring inflation.
The object of my invention is to construct an inflator that will give a supply of
air at each inward and outward stroke of the piston or pistons employed, and
thereby expel a constannt stream of compressed air from the cylinder (or
cylinders) instead of intermittent jets.
The accompanying drawing illustrates a single cylinder inflator made in the
manner I prefer and according to my invention.
Fig. 1, is a view of the inflator closed, and with the cylinder broken to show
the rod.
Fig. 2, is a sectional view of the inflator partly drawn out.
Similar letters of reference indicate similar parts in any of the figures.
In carrying out my invention in constructing a single cylinder inflator, such as
that shown in the drawing (for example), I make a cylinder C, of metallic
tubing, of suitable length and diameter, having a piston of a peculiar construction,
and a tubular piston rod R, provided with a conveniently formed handle H,
preferably made tubular and so as to pass over the cylinder C. The front end of
the piston rod (or of the handle to which the rod is connected) is provided with a

page_text: 1-
nozzle N, to which a length of rubber tube may be readily attached to connect
the inflator with the article to be inflated.
Both ends of the cylinder C, are closed, the front end by the plug P, (or by other
means) and the back end by the outside cap OC; this cap is provided with an
air inlet I, to admit, and a valve V₁, to prevent the escape of, air from the
inside.
The front-plug 1, is provided with a packing leather L, held in position by the
hollow screwed plug P, and fitting closely round the piston rod; it permits the
passage of air through the openings O, into the cylinder, but prevents its return
and escape therefrom....
The cylinder is divided into two compartments by the piston, which is attached
to the end of the piston rod, and is composed of two "hat" leathers HL,
and H L, which resist the pressure and prevent the passage of the imprisoned air
in either direction.
Connected with the piston end of the rod R, and preferably to an attached
piece of metal M, specially constructed are two valves V2, and V³, the valve V³
permits the passage of air from the compartment 2 through the piston into the
tubular piston rod R, and out through the nozzle N, when compressed by the
piston, at the same time closing the valve V
When the action is reversed, the air which has entered the compartment 1,
through the openings O, and passed the leather L, is compressed and passes
through the valve. V2, into the rod R, closing the valve V³, and passing
out through the nozzle N, the same action draws air through the inlet I, and
valve V, into the compartment 2, to be again expelled by the next stroke of the
piston.
Although I have described the arrangement of the apparatus that I prefer, I
may attain the same or a similar result with the valves placed in different positions
to those shown, and I may also attain the same object by expelling the air from
the cylinder (through valves placed at each end) into a tube fixed longitudinally
on the outside of cylinder and provided with an outlet nozzle, or I may enclose
the cylinder within a larger tube, communication being had for the passage of.air
through valves at each end of the cylinder, and an outlet nozzle from the larger
outer tube XC, or if preferred, through a valve to the back end, and through a
hollow piston rod passing through the piston to the front end.
For some purposes I may enlarge the cylinder, and use a piston fitting round a
central tube, its open end connected with the outlet nozzle, and provided with
outlet valve at each end. The cylinder has an inlet valve at each end for
charging with air, and the piston has two rods connected by the handle.
I do not confine myself to any special construction of valve, a piece of oiled silk
or other elastic material impermicable to air, stretched across the opening is
effective.
My improved construction may be applied equally well to inflators having more
than one cylinder.
Where compactness is not absolutely necessary other forms of handles than that
shown may be used, and I wish it to be understood that I do not claim the handle
shown as part of my said invention, but ;
Having now particularly described and ascertained the nature of my said
invention and in what manner the same may be carried into practice, I declare
that what I claim is :-
1-A pocket or hand inflator with one or more cylinders capable of expelling
air at each movement of the piston, and constructed substantially as hereinbefore
described and as shown in the annexed drawings.
2-In the construction of an inflator, the combination of a cylinder C, a
tubular piston rod R, and piston, valves V1, V2, V3, packing leather L, and air
inlets, arranged and co-acting substantially as described and illustrated.
3 An inflator or hand air pump having both ends of its closed cylinder

page_text: provided with air inlets in communication with non-return or back pressure valves
of any suitable construction and having exit or outlet valves for the passage of
the expelled air to the common discharge nozzle, for the purpose specified.
Dated the 27th day of December 1892.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.