A New or Improved Inflator for Pneumatic Tyres.
Year: 1898

page_text: Date of Application, 15th Sept., 1898-Accepted, 5th Nov.,
1898
COMPLETE SPECIFICATION.
A New or Improved Inflator for Pneumatic Tyres.
I, CARL HOFMANN, of 66, Klosterstrasse, Breslau, in the German Empire,
Merchant, 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:-
The
This invention relates to a pneumatic tyre inflator of that type which may be
operated while the vehicle or machine is running or is being driven.
inflator may be put into or out of action at will.
The accompanying drawings, to which I will hereinafter refer, illustrate the
application of the improved inflator to either the front or the back wheel of a
bicycle.
Figure 1 illustrates the hub of the wheel and the pumping device in longi-
tudinal section.
Figure 2 shows them in cross section.
Figure 3 represents them in plan.
a is the fixed axle upon which the wheel revolves, and b is the hub or centre of
the wheel. The tube c which surrounds the axle is divided in its length, and
The excentric
between the two parts an excentric d is secured to the axle a.
strap is provided with a coupling rod e which is secured to the piston h of an air
pump through the intermediary of a device which will be described hereinafter.
The pump f is secured to the wheel hub by being screwed, as at the point g, or
it may be attached in any other suitable manner.
a
The air pump therefore rotates with the wheel and this rotation causes
reciprocation of the piston when the latter is connected to the coupling rod e.
Air would then be forced through the tube to the tyre.
i is the pump inlet valve, and k is a safety valve which is placed in the union m
by means of which the pipe is connected to the pump. This valve prevents
the tyre being subjected to excessive pressure.
The upper or outer face of the piston h has a hollow rod n secured to it, this
rod passing through the cover or cap of the pump. Within the rod n is a second
The end of the rod n
rod o which is attached to the excentric connecting rod e.
carries a turn button or similar device which by means of a bayonet catch
When this has been done the
or the like may be caused to engage with the rod o.
pump is in action and the rotation of the wheel causes the piston to force air into
the tyre. When the rods and are disconnected the piston remains in a
stationary position and the rod o reciprocates within the tubular rod n.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
1. An inflator for pneumatic tyres, consisting of a pump which is attached to
the hub or other rotary part of the wheel, an excentric secured to the fixed axle,
and means or devices, for connecting the excentric to the pump piston when

page_text: desired, all constructed, arranged and operated substantially as hereinbefore
described and as illustrated by the accompanying drawings.
2. In an inflator of the type set forth, means for putting the pump in or out
of action at will, consisting of a tubular rod which is attached to the outer face of
the piston and which contains a second rod secured to the excentric rod, and
means for coupling the two rods together, substantially as hereinbefore described
and as illustrated by the accompanying drawings.
3. An inflating device for pneumatic tyres, constructed arranged and operating
substantially as hereinbefore described and as illustrated by the accompanying
drawings.
1
W. E. HEYS & SON,
Agents for the Applicant.