Improvements in or relating to Pumps for Inflating Pneumatic Tyres.
Year: 1896

page_text: Date of Application (in United Kingdom), 2nd S-pt., 1896
Complete Specification Left, 2nd Sept., 1896-Accepted, 19th Sept., 1896
Improvements in or relating to Pumps for Inflating Pneumatic
Tyres.
I, ALEXANDRE-AUGUSTIN DUMAS, Junior, Engineer, of 8 Avenue de la
Republique, Paris in the Republic of France 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 has for its object the construction of a pump for inflating
pneumatic tyres of the wheels of cycles or other vehicles.
This pump is characterised by the arrangement at the extremity of the hollow
piston rod or of the pump barrel of a pivotted piece to be placed on the ground
and on which the foot of the user is pressed, so that the body of the pump may be
worked by one only or by both hands, and the weight of the body may be thrown
on it so as to more conveniently attain the desired pressure.
In order to make the invention better understood, I append to the present
description, as an example, a drawing in which
Figure 1 is an elevation of my improved pump.
Figure 2 is a section on line 1-2 of Figure 1.
Figure 3 is a front view in which the piece f is shown folded up.
Figure 4 is a modified construction.
Figure 5 is a plan of the notched guide of the piston-rod.
My improved pump comprises, like all similar apparatus a cylinder or pump-
barrel a and a piston 6 mounted on a hollow rod c.
But in my pump this rod carries at its free end a part d on which is screwed the
flexible tube union e to receive the rubber tube conducting the compressed air to
the valve of the pneumatic tyre.
In the drawings the union e is represented as screwed into the interior of a
screw threaded boss or branch d' of the part d; but I may also screw thread the
boss so as to screw the hose-union on externally; on the other hand the part d,
instead of having the shape represented in the drawings may be spherical or of
other convenient shape.
This part d is perforated or bored for the purpose of receiving the transverse
branch of a bifurcated piece f which can turn only over a half circle being limited
by stops or projections in one piece with d from complete rotation the stops
being so placed that the piece f cannot be turned to the side carrying the union
piece.
Finally the part d is provided with a passage d³ which forms a communication
between the union piece and the interior of the rod c of the piston.

page_text: The method of using the pump is easily understood. The foot is pressed on the
branches of the piece f placed on the ground, and the pump body a is operated in
the usual way; the compressed air is forced through the rod c, passage d³ and the
union e to the tube which conducts it to the valve of the tyre to be inflated.
When the pressure rises and it is necessary to use considerable force the pump can
be operated with both hands, as it is held by the foot, and if necessary the whole
weight of the body can be used.
In order to render the apparatus portable and convenient when not in use,
I form notches in the guide h of the rod c which guide is screwed into the end
of the pump body a the number of notches may be two, four, six or more, and in
two of which the branches of the fork f can engage when suitably folded as clearly
shown in Figure 3.
Figure 4. is a modified construction in which the pump body a is continued by a
sheath screwed on to it which can be used as a handle, when the pump body is of
small diameter, and in which may be placed the union-piece, flexible tube or any
other objects which the user may desire to place there. But the addition of this
sheath is optional and I reserve to myself the right to modify the shape and form
of the complete pump, without departing from the essential features of my
invention.
The foregoing is the form which I prefer but the folding piece may be connected
to the pump barrel and a handle to the piston rod if that construction be desired.
Moreover the folding piece may be closed at the end or throughout its length for
strength or convenience.
It is evident that the pivotted foot-hold f may be used to hold the pump by
other means than the foot; it may be inserted in a socket upon some fixed support,
say the wheel to be inflated, the framework of a cycle, the body of an auto-car etc.,
or may take a hold upon the ground.
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. A pump for inflating pneumatic tyres characterized by the arrangement at
the end of a hollow piston rod of a pivotted piece for holding the pump by the foot
of the user, the branches of said piece being capable when not in use of heing
folded up, in order to engage with notches in the guide of the piston rod; the
pump being extended if desired, by a sheath screwed on to it substantially as set
forth.
2. In a pump for inflating pneumatic tyres the employment of a pivotted piece
such as f for the purpose described.
3. In a pump for inflating pneumatic tyres the combination with a hollow piston
rod or with the pump barrel of a folding piece for the purpose specified.
4. In a pump for inflating pneumatic tyres the combination with a hollow piston
rod of a folding piece and side air branch substantially as described.
5. The complete pump for inflating pneumatic tyres substantially as described.
Dated this 2nd day of September 1896.
BOULT WADE,
Agents for the Applicant.