Improvements in or relating to Pumps suitable for use with Pneumatic Tyres.
Year: 1892

page_text: Date of Application, 21st Nov., 1892
Complete Specification Left, 15th Aug., 1893-Accepted, 18th Nov., 1893
PROVISIONAL SPECIFICATION.
Improvements in or relating to Pumps suitable for use with
Pneumatic Tyres.
I, FRIEDRICH VEITH of Geluhausen, near Frankfort a/M, in the Empire of
Germany, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to a pump which may be used for charging pneumatic cycle
tyres with air and also for effecting repairs in the tyres by injecting rubber solution
uto punctures. The pump is therefore a double purpose pump but it will be
understood that it may be used for other similar purposes, other liquids or materials
being then employed in place of the solution. I will describe the pump in its
construction for repairing bicycle tyres.
For this purpose the pump consists mainly of two cylinders or barrels the inner
one adapted to contain the solution or other material and the outer cylinder to
discharge the air necessary for charging the tyre. The inner cylinder carries a
piston or equivalent fitting tight in the outer cylinder; conveniently this piston
may consist chiefly of a cup leather or the like a suitable valve being provided
preferably in the piston so as to establish when required communication between
the outer and inner cylinders. Various kinds of valves may be employed for this
purpose but I have obtained excellent results from a valve consisting of a spindle
with a head or valve at each end. The inner cylinder may by preference carry a
cup or cap adapted to extend over the outer cylinder when the pump is closed up and
the opening into the inner cylinder is normally closed by a plug. By this arrange-
ment when using the pump for charging the air under heavy pressure into the tube
a good hold is provided for the band of the operator. At the other end of the
instrument, and connected with the outer cylinder is a branch, or nozzle, which may
be provided if desired with a length of flexible tube carrying the usual screw con-
nection by which it may be connected with the valve opening into the tyre. A
pointed nozzle is also provided and upon the removal of the previously described
plug this nozzle may be screwed into the opening of the inner cylinder. The
operation of this pump is as follows:-
It is
To charge the tyre with air the pointed nozzle which is usually carried at the end
of the flexible tube or upon the branch or nozzle of the outer cylinder, is removed,
and the pump connected with the valve of the tyre in the ordinary manner.
then used as an ordinary pump and the tyre is charged, the air entering the anuular
space between the two cylinders, and passing the piston when it is moved in one
direction and being forced into the tyre when moved in the opposite direction, the
arrangement of the cup leather or equivalent being such as to permit of this action
as will be well understood by persons familiar with this class of pump. When the
charging is completed the pump is unscrewed from the tyre and the pointed nozzle
replaced.
To use the pump for stopping a puncture the plug is unscrewed from the inner
cylinder and replaced by the pointed nozzle the plug being then screwed in to the
place on the flexible tube usually occupied by the pointed nozzle. The inner
cylinder is kept charged with solution and to close the puncture the pump is
operated as previously described, but the solution is discharged from the opposite
end of the pump to that from which the air was driven the valve in the piston
previously described allowing of this arrangement, and the air being forced from
the outer cylinder into the inner cylinder behind the solution forces the latter out
through the pointed nozzle into or through the puncture into which the pointed
nozzle has been inserted.

page_text: I wish it to be understood that I do not confine myself to the precise details of
construction above indicated, for example a very differeut form of piston and valve
might be employed to produce the same result. Also although the pump as above
described is particularly useful for repairing or closing punctures formed in tyres
consisting of solid or thick wall of rubber, or rubber and canvas in which no
separate air tube is employed, it will be seen that it may be used to contain
solution for use with tyres of other descriptions in which a repair is effected by
placing a patch upon it and indeed for other purposes where a ready supply of
solution is required. It will therefore be realized that this pump, which being
arranged telescopically takes up but little space when closed, is not merely an air
pump but also a solution pump for repairing tyres which do not have a separate air
tube and also serves as a reservoir or vessel to carry about the solution which may
be required for tyres of other descriptions.
Dated this 21st day of November 1892.
W. P. THOMPSON & BOULT,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Pumps suitable for use with
Pneumatic Tyres.
I, FRIEDRICH VEITH of Gelnhausen, near Frankfort a. M. in the Empire of
Germany, Engineer, 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:-
To enable cyclists, when on tour, to be at all times able to make any necessary
repairs to their machines, that is to say, to the air tube, they must take along with
them a considerable number of tools. It is with a view of minimising such number
of tools that I have combined, with an air pump, a syringe for the rubber solution
as will be hereinafter described with reference to the accompanying sheet of
drawings
Figure 1 being a section of the entire tool, whilst
Figure 2 is a section showing the valve parts, hereinafter described, on an
enlarged scale.
The usual solid piston rod a of the metallic cylinder 6 is made hollow and serves
as a reservoir for the rubber solution. The lower part of this hollow piston rod is
provided with a screw thread for the reception of a screw k.
This screw serves, on
the one hand for fastening the leather collar or washer i, but also, by means of its
centre being bored out, it can loosely guide a screw d provided with a nut c and
a slit x.
The screw d will act as an automatic valve according to the way the pump
is used.
The upper part of the hollow piston rod has also an interior screw thread, similar
to that at h, serving both for receiving the closing plug or screw f, and also the
syringe nozzle e; moreover, the upper part has a bell-shaped handle piece 1, which,
when the pump is not being used, sits direct on the guide piece m, thereby
considerably reducing the room taken up by the pump.
If now the pump is to be used as an air pump for filling the tyre, the nut c of the
screw d is turned up tightly so that the air then (see the direction of the arrows) is
cut off from entering the liquid by means of the packing or washer g which becomes
tightly compressed. The upper part of the piston rod is closed by means of the
screw and the nipple or tube h is connected with the air valve to be found on
every tyre. When the piston is drawn up, the air enters between the piston rod a
and the guide piece m, and, when the piston is thrust out, the air is compressed and
passed into the tyre.
If the air pump, however, is to be used as a syringe for the rubber solution, the

page_text: opening shown in Figure 1 is closed by means of the screw f, and the syringe
nozzle or tube e is screwed into the upper end of the piston rod, at the same time
the nut c is loosened about two turns, so that a vertical movement may be given to
the screw d. In a similar manner as when the pump was being used for pumping in
air on the drawing up of the piston, air enters between a and m, but, when the
piston is pressed down, the compressed air finds no exit. The air, however, passes
out by means of the centrally bored out part and by means of the slits under the
packing g, raises the packing and compresses the rubber solution (which is contained
in the hollow piston rod) on to the desired part of the defective tyre by means of
the syringe nozzle or tube e.
.
I wish it to be understood that I do not confine myself to the precise details of
construction above indicated, for example, a very different form of piston and valve
might be employed to produce the same result. Also, although the pump as above
described is particularly useful for repairing or closing punctures formed in tyres
consisting of a solid or thick wall of rubber, or rubber and canvas in which no
separate air tube is employed, it will be seen that it may be used to contain solution
for use with tyres of other descriptions in which a repair is effected by placing a
patch upon it, and indeed for other purposes where a ready supply of solution is
required. It will, therefore, be realised that this pump, which, being arranged
telescopically, takes up but little space when closed, is not merely an air pump, but
also a solution pump for repairing tyres which do not have a separate air tube, and
also serves as a reservoir or vessel to carry about the solution which may be required
for tyres of other descriptions.
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 :-
The improvements in or relating to pumps suitable for use with pneumatic tyres
consisting in the employment, in such pumps, of a hollow piston rod serving as a
reservoir for a liquid and having at one end a valve (for instance, such as that
formed by the parts c, d, c) which can be closed when the pump is being used as an
air pump and be opened when being used as a syringe, whilst the other end of the
piston rod is screw-threaded for the reception of a plug or syringe nozzle and may
be provided with a bell-shaped handle.
Dated this 14th day of August 1893.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.