Improvements in Valves for Inflating the Pneumatic Tyre Tubes of Cycles and the like.
Year: 1895

page_text: Date of Application, 20th Nov., 1895
Complete Specification Left, 15th Aug., 1896-Accepted, 17th Oct., 1896
PROVISIONAL SPECIFICATION.
Improvements in Valves for Inflating the Pneumatic Tyre Tubes of
Cycles and the like.
We, ALFRED MACDONALD Senior Cycle Manufacturer, and ALFRED MACDONALD
Junior, Engineer, both of 47 Hozier Street in the City and County of Glasgow, do
hereby declare the nature of our invention to be as follows:-
This invention has reference to improvements in valves used in inflating the
pneumatic tyre tubes of cycles and the like.
According to our improvements we use a short metallic tube with screw threaded
external surface and the inner end of this tube which fits within the pneumatic tube
has a hollow stud or head soldered or otherwise secured to it, and this head has slits
or openings formed in it for the inlet and escape of the pressure air. A loose spindle
or stem fits within the inner part of this metal tube and has a tapering or other
projecting head at its inner end within the hollow stud and forms a valve.
When the tyre tube is being inflated the compressed air passes from a pump
through the metallic tube and out through the orifice in hollow stud into the tyre
tube and when this operation is finished the inner spindle with its tapering valve
head is brought to work against a correspondingly shaped seat at end of metal
tube within the hollow head and so forms an efficient valve. This is effected by
forming the outer end part of metal tube of preferably less diameter than the inner
part, and fitting within it a spindle having a capped head at its outer end, and an
internal screw threaded hollow inner end. By turning this spindle its inner end
screws over the threaded end of the inner spindle on which valve is formed, and
by this means the valve is travelled tightly on to its seat after the tyre tube has
been inflated; while by unscrewing the outer spindle the valve will be freed and the
air escapes to deflate the tyre.
This valve appliance is secured to the air tube by passing through a hole in the
latter and having the stud head within the air tube, and a screwed on nut and washer
over metallic tube pressing against outer surface of tyre tube, but as a further
protection against the escape of air through hole in tyre tube a cup shaped or deep
cylindrical washer is slipped over the aforesaid nut and washer, and pressed up
against tyre tube by a thumb screw nut working over the outer screw threaded
surface of metallic tube.
Dated 19th day of November 1895.
Improvements in Valves for Inflating the Pneumatic Tyre Tubes of
Cycles and the like.
We, ALFRED MACDONALD, Senior, Cycle Manufacturer, and ALFRED MACDONALD,
Junior, Engineer, both of 47 Hozier Street, in the City and County of Glasgow, do
hereby declare the nature of my invention and in what manner the same is to be
performed, to be particularly described, and ascertained in and by the following
statement in writing that is to say :-
This invention has reference to improvements in valves used in inflating the pneumatio
tyre tubes of cycles and the like.

page_text: And in order that our said invention and the manner of carrying same into practice
may be properly understood we have hereunto appended a sheet of drawings in which
Figure 1 represents a sectional elevation and Figure 2 a transverse section of a valve
con-tructed in accordance with our improvements.
Referring to these drawings:-
According to our improvements we use a short metallic tube a with screw threaded
external surface, and the inner end of this tube which fits within the pneumatic
tube A has a hollow stud or head a¹ brazed, soldered, or otherwise secured to
it, and this head a' has slits or openings a formed in it for the inlet and escape
of the pressure air. A loose spindle or stem fits within the inner part of this
metal tube a and has a tapering or other projecting head at its inner end
within the hollow stud and forms a valve.
When the tyre tube is being inflated the compressed air passes from a pump
through the metallic tube a and out through the orifices a² in hollow stul a into the
tyre tube, and when this operation is finished the inner spindle 6 with its tapering
valve head is brought to work against a correspondingly shaped seat a³ at end
of metal tube a within the hollow head a' and so forins an efficient valve.
This is effected by forming the outer end part of metal tube of preferably less
diameter than the inner part, and fitting within it a spindle c having a capped head c¹
at its outer end, and an internal screw threaded hollow inner end. By turning this
spindle its inner end screws over the threaded end of the inner spindle on which
valve is formed, and by this means the valve is travelled tightly on to its seat a³
after the tyre tube has been inflated; while by unscrewing the outer spindle c the
valve 6 will be freed and the air escape to deflate the tyre.
C
This valve appliance is secured to the air tube A by passing through a hole in the
latter, and having the stud head a¹ within the air tube, and a screwed on nut and
washer d d over metallic tube a pressing against outer surface of tyre tube, but as a
further protection against the escape of air, through hole in tyre tube a cup shaped
or deep cylindrical washer d is slipped over the aforesaid nut and washer and pressed
up against tyre tube by a thumb screw nut d³ working over the outer screw threaded
surface of metallic tube a.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:
First. The construction of valves for inflating the pneumatic tubes of cycles and the
like, substantially as herein described in reference to and shown in the accompanying
drawings.
Second. In valves for inflating the pneumatic tubes of cycles and the like, the
arrangement and use of an inner spindle with valve, operated by an inner screw
threaded spindle, substantially as herein described in reference to and shown in the
accompanying drawings.
Dated the 14th day of A murnet 1896
W. R. M. THOMSON & Co.,
96 Buchanan Street, Glasgow, Agents.