Year: 1897

page_text: Date of Application, 21st Apr., 1897-Accepted, 5th June, 1897
A communication from FRIEDRICH LOUIS MAXIMILIAN BERNHARDT and
FRANZ BERNHARD HERMANN Kramer, both of Dresden, in the Empire of
Germany, Merchants.
I, ALFRED JULIUS BOULT of 111 Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, 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 present invention relates to a valve serving for the inflation of pneumatic
tyres (especially for cycles) is characterised by the simple and secure manner of its
closing, after inflation, and at the same time by its perfect working during inflation
when it acts as a check-valve. The valve is characterised by the arrangement of
two seatings opposite each other in a casing, a valve-rod provided with a ball or two
cones between the two seats and forming during inflation in combination with the
upper seat a check-valve. After the inflating is finished the valve is pressed down
by screwing on the dust-cap and acts then in co-operation with the lower seat as a
stop-valve.
In the accompanying drawing the valve is illustrated in two positions (before
and after inflation), in Figs. 1 and 2 in longitudinal sections, Fig. 3 being a
modification:
A is the valve-casing which is secured to the tyre or to the inner tube in an air-
tight manner in any well-known manner, and is provided with a longitudinal
passage or boring. A reduced portion of this passage constitutes the lower seat b
and a perforated plug e screwed in, in an air-tight manner from the top and easily
detachable to enable the rod to be removed, forms the upper valve-seat e. The
valve-rod D extends through the passage in the plug and carries a ball-shaped or
enlarged part D₁ which constitutes in one piece both the upper and lower valve-
cones. The upper hemisphere c¹ may be called the upper and the lower hemi-
sphere the lower valve-cone, for as the former forms a complete valve with c, so
does the latter with b. D₁ is preferably covered with a rubber tube e which
extends downwards surrounding the valve-spindle D. The rubber covering of the
enlarged portion D' (or of the two valve-cones c and b Fig. 3) serves to render
the closing perfectly secure. At the bottom the rubber tube e rests on a sleeve f
supported centrally by radial ribs, said sleeve affording a guide for the valve-rod;
as the tube e bulges out over the sleeve f during the descent of the valve-rod and
tends to return again to its normal position during the upward movement of the
rod D, it acts as a substitute for a spring.
To inflate the tyre, the cap G is of course removed. At each stroke of the pump
piston the rod D descends, the passage between c and c¹ is opened and air enters the
tyre but the spindle cannot descend far enough for the valve b' to close against the
seat b. When however the dust-cap G is screwed on (Fig. 2), its pin g presses
the valve-rod so far down that the valve-cone b¹ is firmly pressed against 6 whereby
the valve is securely closed.
The valve cones c¹ 6' may be in separate parts. In the modification (Fig. 3, a
portion of a longitudinal section) they are shown separate. At the same time the
valve-cones in the latter example are shown as of different shape, viz. as truncated

page_text: .cones. A rubber covering e¹ e¹ for the cones is again shown. But the rubber spring
is replaced by a steel-spring e. The valve-cones might also be flat discs or of any
other suitable shape, in which case the shape of the seats would be altered
accordingly. By the expression "valve-cone" all such shapes are to be
understood...
Having now particularly described and ascertained the nature of the said inven-
tion as communicated to me by my foreign correspondents, and in what manner
the same is to be performed, I declare that what I claim is :-
1. An inflation valve for pneumatic tyres consisting of a tubular or bored casing
having two internal valve-seatings opposite each other and a certain distance apart
in combination with a valve rod carrying two valve-cones (or a single double
acting valve) co-operating with the two valve-seatings) said valve-rod being
normally raised by a rubber or steel-spring and a cap adapted when screwed down
to press the valve-rod downwards to bring its lower cone against the lower valve-
seating substantially as described.
2. The combination and arrangement of parts constituting the complete valve
for pneumatic tyres substantially as described and illustrated in Figures 1 and 2 or
in Figure 3 of the accompanying drawings.
BOULT & WADE,
Agents for the Applicant.