Device for Charging Pneumatic Tyres.
Year: 1896

page_text: Date of Application, 21st Mar., 1896-Accepted, 25th Apr., 1896
COMPLETE SPECIFICATION.
Device for Charging Pneumatic Tyres.
I, HASTINGS HENRY JOHNSON, of 109 Post Office Court, City of Minneapolis,.
in the State of Minnesota, United States of America, Mechanic, 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 an improved device for charging pneumatic tyres with.
air under pressure as I shall describe referring to the accompanying drawings, in
the several figures of which, like letters refer to like, parts.
and
Fig. 1 is a side elevation, shewing the charging device as applied to a cycle tyre.
Fig. 2 is a vertical section through a part of the charging device and the tyre,.
Fig. 3 is a central vertical section through a part of a charging device, having a.
slightly modified form of delivery nozzle.
a a¹ a² a³ represent, respectively, the pneumatic tyre, the tyre nipple, the rim,.
and the spokes of an ordinary cycle wheel, 6 6 represent, respectively, the piston
and the cylinder, of a portable hand action air pump.
The cylinder of the pump is extended downward, beyond the limit of the piston's
in stroke, as a tube 63, which may be smaller than b', as shewn in Fig. 2, or of the
same size as shewn in Fig. 3.
In the end of the tube is fixed a perforated elastic diaphragm c c composed of
rubber or similar impervious elastic material preferably made in the form of a cone
frustum c, having a flanged base c' with its conical part c projecting into the lower
end of the tube and with its flanged base el clamped between an annular internal
plug &, fixed inside the tube 62, and a flanged nut c³ screwed on the lower end of b...
Part of the diaphragm c c projects beyond the metallic parts & c and c³.
The tube extends beyond the limit of the piston's in stroke more than the
length of the longest tyre nipples al in use; and the perforation in the
diaphragm c c is of less diameter than the diameter of the smallest tyre nipples a"
in use.
Hence, any tyre nipple can enter the tube and the device may be applied to
the nipple of any tyre.
The tyre nipple a¹ is assumed, to be provided with the usual check valve.
To apply the device, the pump is placed as shewn in Figs. 1 and 2, the tyre
nipple a' entering the tube, through the diaphragm c c which forms an air tight.
joint during the charging action of the pump, first by its own elasticity, and then
by the air pressure causing the diaphragm nipple c to grasp the tyre nipple a', and
ensure a perfectly tight joint. The part of the rubber nipple c c which projects
beyond the metallic parts 63 c c forms a cushion which saves the rim a³ from being
scratched or injured by applying the pump.
From the above it will be seen that, by this invention, an efficient charging
device is obtained very simple in construction, and capable of being quickly
applied, without requiring any tool for coupling it to the tyre nipple, the necessary
air tight joint being automatically effected, by simply applying the pump to
the tyre.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
A device for charging pneumatic tyre: comprising an air numn having in its

page_text: delivery nozzle an elastic perforated diaphragm adapted to engage with the tyre-
nipple and automatically form an air tight joint therewith by simply applying the
pump to the nipple, substantially as described.
Dated this 21st day of Monch 1000
ABEL & IMRAY,
Agents for the Applicant.