Improved Automatic Cycle Tyre Inflating Pump.
Year: 1898

page_text: Date of Application, 8th Oct., 1898-Accepted, 19th Nov., 1898
COMPLETE SPECIFICATION.
Improved Automatic Cycle Tyre Inflating Pump.
I, WILHELM LOEBINGER, of No. 15, Claudius Strasse, Berlin, 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:-
My invention relates to a cycle tyre inflating pump which will put itself auto-
matically out of action whilst the cycle is travelling.
Pumps for eycles which are fixed to the wheel, and are actuated during the pro-
gression of the cycle by means of a fixed part of the frame in such a manner that
they can automatically pump air into the tyre, are already known. But these
automatic pumps have the drawback that the rider must dismount to put the pump
into and out of action, whereby the principal object in view, namely, the con-
venience of the rider is not attained.
The present improvement forms an automatic cycle tyre pump of the kind above
indicated, which can be set in action by the rider at any desired moment during
the riding, and will then pump air into the tube up to a maximum pressure, which
can be exactly regulated, and will then automatically shut itself off.
Referring to the accompanying drawing:
Figure illustrates a hind wheel of a cycle with the pump in position.
Figure 2 shews the pump and hub of the wheel on an enlarged scale in elevation.
Figure 3 shews the same viewed from above.
Figure 4 shews the details of the control mechanism.
The pump c is attached to the hub a by means of the clips b, and consequently
rotates with the wheel. The piston d is continuously pressed outward' by means
of the spring e. A double armed lever g revolves upon an axle f supported by the
pump body, and encloses by means of the slot h the pin i on the pump piston. The
other end of the lever g is preferably provided with a roller k, which, at each
revolution of the wheel, runs upon a curved plate fixed to the fork m, and there-
by effects the working stroke of the piston. When the roller k leaves the curve /,
the spring e immediately returns the piston to its original position (see Figures 1;
2, and 3). The part is supported as shewn in detail in Figure 4 by means of the
hollow sleeve n which is itself carried in a sleeve o fixed to the fork m.
spring placed in the hollow sleeve n presses this latter, and consequently also
the curved surface constantly into the limit of its position determined by a pro-
jection. The tension of the spring p can be regulated to any desired extent from
the outside by means of the set screw p¹.
The
From the foregoing it will be obvious that the curved surface will actuate the
pump piston d until the tension of the inflated tyre exceeds the tension of the
spring p. After this moment the lever g will push the curved surface at each
revolution further downwards until a spring catch r engages in a notch
sleeve n, and thereby secures the curved surface in its position of rest. From this
moment the pump can no longer operate because it is deprived of any further
impulse.
of the

page_text: If the rider notices that his pneumatic tyres are again becoming slack he can
draw out without dismounting, and consequently during the riding, the cord or
the like (Figure 4) thus withdrawing the catch r. The spring presses the curved
surface again outwards, and the pump commences its activity again, which will
only cease again after the tyre has attained the required tension.
As the maximum tension of the tyre depends upon the tension of the spring p
it is easy to fix the maximum tension of the tyre at will by regulating the tension
of the said spring. In order to prevent this maximum tension being exceeded by an
inexperienced hand, the length of the set screw 7' can be so chosen that the
maximum tension of the spring corresponds to the highest permissible tension
for the tyre.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
1. An improved cycle tyre inflating pump automatically placing itself out of
action during the motion. of the cycle, in which the pump cylinder is attached to
the wheel, and a projection actuating the pump piston is attached to the frame,
and further characterized by the arrangement that the projection is held in the
working position. by means of a spring 2, which spring admits of the moving away
of the projection on the attainment of the maximum pressure in the tyre, so that
the said projection no longer acts upon the pump, and the power of which spring
is devised to be regulated according to the required pressure in the tyre.
2. A modification of the cycle tyre inflating pump set forth in Claim 1 con-
sisting essentially in the provision of a spring catch which can be drawn out by
the rider without dismounting, by means of which the piece is automatically held
out of action after the attainment of the required maximum pressure in the tyre
in that position in which it is without influence upon the motion of the pump.
3. The improved automatic cycle tyre inflating pump constructed and operating
substantially as described and illustrated in the accompanying drawing.
Dated this 7th day of October 1898.
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C., Patent Agents for the Applicant.