Year: 1897

page_text: I, ETIENNE SCLAVERAND, of 6, Rue Caffarelli, Paris, in the Republic of France,
Engineer, do hereby declare the nature of this invention to be as follows:
―
This invention relates to improvements in pumps chiefly adapted for use in
inflating pneumatic tyres.
When air is pumped directly into a receiver (such as a tyre) with a pump it is
very important to be assured that the pressure in the receiver is the same as that in
the pressure-gauge chamber with which the pump is provided. To this end 1 provide
at the side of the pressure-gauge chamber a space or chamber into which the air is
forced from the pump and wherein it is retained by means of a valve. Two tubes
or passages pass from the said space, one passage being in communication with the
air chamber or receiver and the other with the pressure-gauge chamber.
In carrying out my invention I advantageously pivot the pump at its lower
end in a bearing which can itself be pivoted to a bolt or pin in a stand or
support. At the base of the pump body I provide a space or chamber which
communicates with the pressure-gauge.
The said chamber communicates with the pump cylinder by a nozzle which
is furnished with a valve. This valve consists of a conical plug fitted
with leather packing and carried on a rod having its end flattened, the said
flattened end passing into guide slots in a plug screwed into the nozzle.
The air compressed by the pump enters the lower space or chamber in the
same whence it passes to the tyre or the like to be inflated. The pressure of the
air in the chamber and consequently that of the air in the pneumatic tyre whilst
it is being inflated is read off on the pressure-gauge.
The pressure-gauge may be fitted to the lower chamber in the pump either above
or below the outlet from the said chamber to the tyre or the like.
The piston which I advantageously employ has a cup leather resting on a disc.
The piston can also be fitted with a ring of the same diameter as the inside of the
pump cylinder so as to form a guide or circular groove and notches or slots around
the periphery of the discs or ends of the ring providing a free passage for the air.
In a modified construction of my improved inflation pump the lower portion
of the pump body carries a socket at right angles to its axis. A rod or support
formed in two parts hinged together is inserted into the socket and serves as a
support during the operation of the pump, when the two parts are made rigid and
pulled into the socket, a collar on the rod striking against the end of the socket
so as to stop the rod when it is in such a position that it projects to the same extent
on each side of the pump cylinder. When the pump is not in use the rod is pushed
back through the socket until the hinge has passed through the said socket when

page_text: the outer part of the rod or support is turned on the hinge and laid against the
pump body; a collar at the end of the rod prevents it from being pulled out of
the socket. A spring catch fixed to the side of the pump cylinder receives the
turned back end of the rod and retains it in position. The piston rod is provided
with a ring of india-rubber under its handle to deaden shocks which occur during
the operation of the pump.
The pump handle is hollow and is closed by a screwed
cap or cover having on its inner face a series of connections to form a joint the said
connections being screwed into the cap or cover. The outlet tube for the air
compressed by the pump may be formed in the piston rod which is hollow.
handle may be utilized for holding different accessories useful to cyclists.
Dated the 9th day of April 1897.
The
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
I, ETIENNE SCLAVERAND, of 6, Rue Caffarelli, Paris, in the Republic of France,
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:.
-
This invention relates to improvements in pumps chiefly adapted for use in
inflating pneumatic tyres.
When air is pumped directly into a receiver (such as a tyre) with a pump it is
very important to be assured that the pressure in the receiver is the same as that in
the pressure-gauge chamber with which the pump is provided. To this end I provide
at the side of the pressure-gauge chamber a space or chamber into which the air is
forced from the pump and wherein it is retained by means of a valve. Two tubes
or passages pass from the said space, one passage being in communication with the
air chamber or receiver and the other with the pressure-gauge chamber.
To enable my invention to be fully understood I will describe it by reference to
the accompanying drawing, in which ;-
Figure 1 is a side elevation of a pump or inflater made according to the invention:
Figure 2 is a plan thereof:
Figures 3, 4, 5 and 6 are views of details drawn to a larger scale:
Figure 7 is a side elevation of a modified construction of inflation apparatus:
Figure 8 is a view of a detail drawn to a larger scale:
Figure 9 is a view similar to Figures 1 and 7 of a further construction of
apparatus:
Figure 10 is a horizontal transverse section thereof:
Figure 11 is a sectional front elevation; and
Figure 12 is a side elevation thereof shewing the apparatus ready for use:
Figure 13 is an underside view of the cylinder cap.
In carrying out my invention I advantageously pivot the pump A at its lower
end (as shewn in Figures 1, 3 and 7) on a pin K in a bearing E which is pivoted
to a bolt or pin L in a stand or support S. At the base of the pump body AI pro
vide a space or chamber D which communicates with the pressure-gauge C. In
Figure 4 the support S is shewn replaced by a stirrup T to the upper part of which
the chamber D is pivoted and in which the operator's foot is inserted when the
apparatus is used.

page_text: The chamber D also communicates with the pump cylinder A by a nozzle c which
is furnished with a valve d. This valve is provided with a conical plug g (see
Figure 5) fitted with leather packing and carried on a rod / having its end m
flattened, the said flattened end m passing into guide slots n (see Figure 6) in a
plug o screwed into the nozzle F.
The air compressed by the pump enters the lower space or chamber D in the same
whence it passes through the tube e to the tyre or the like to be inflated. The
pressure of the air in the chamber, and consequently that of the air in the pneumatic
tyre whilst it is being inflated, is read off on the pressure-gauge.
The pressure-gauge may be fitted to the lower chamber in the pump either above
or below the outlet from the said chamber to the tyre or the like, as shewn
respectively in Figures 7 and 1. The piston which I advantageously employ and
which is shewn to a larger scale in Figure 8 has a cup leather i resting on a disc.
The piston can also be fitted (as shewn in Figure 11) with a ring o¹ of the same
diameter as the inside of the pump cylinder so as to form a guide, an annular
groove p and notches or slots q around the periphery of the discs or ends of the
ring o¹ providing a free passage for the air.
In the modified construction of my improved inflation pump shewn in Figures 9,
10, 11, 12 and 13 the lower portion of the pump body A carries a socket plat
right angles to its axis. A rod or support q', formed in two parts hinged together
at r, is inserted into the socket p₁ and serves as a support during the operation of
the pump, when the two parts are made rigid and pulled into the socket, as shewn
in Figure 12, a collars on the rod q' striking against the end of the socket p¹ so as to
stop the rod when it is in such a position that it projects to the same extent on each
side of the pump cylinder A. When the pump is not in use the rod is pushed back
through the socket until the hinger has passed through the said socket when the
outer part of the rod or support is turned on the hinge and laid against the pump
body, as shewn in Figure 9; a flange or head t at the end of the rod prevents it from
being pulled out of the socket. A spring catch u, fixed to the side of the pump
cylinder A, receives the turned back end of the rod and retains it in position.
The piston rod is provided with a ring of india-rubber under its handle x to
deaden shocks during the operation of the pump. The pump-handle is hollow
and is closed by a screwed cap or cover y having on its inner face a series of con-
nections z (Figure 13) to form a joint, the said connections being screwed into the
cap or cover y. The outlet tube for the air compressed by the pump may be formed
in the piston rod which is hollow. The handle may be utilized for holding different
accessories useful to cyclists.
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. In apparatus for inflating pneumatic tyres and the like the combination with
the pressure-gauge of a chamber into which the pump cylinder opens by a valve
controlled passage and which is in communication with the receiver, the pneumatic
tyre for example, and with the pressure-gauge so that the latter indicates exactly
the pressure in the receiver, substantially as herein before described.
2. In apparatus of the kind described in Claim 1 the employment of a pump
which is pivoted in a bearing pivoted to a support or stand, or which is pivoted to a
stirrup designed to receive the foot of the operator, substantially as herein before
described.
3. A pump having a rod which passes through a socket fixed to the end of the
pump cylinder, and which rod is formed in two parts hinged together to enable it to
be folded along the said cylinder to which it is secured by a suitable catch, sub-
stantially as herein before described.
4. The construction of pump piston having the guide ring and notched discs
substantially as described and illustrated in Figure 11 of the accompanying driwing.

page_text: 5. The improved pumps for inflating pneumatic tyres and the like herein before
described and illustrated in the several figures of the accompanying drawing.
Dated the 7th day of January 1898.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.*