An Improvement in the Attachment of Dust-caps of Bicycle Valves.
Year: 1899

page_text: Date of Application, 19th June, 1899
Complete Specification Left 16th Mar
1000ccanted 20th Ann
1000
PROVISIONAL SPECIFICATION.
An Improvement in the Attachment of Dust-caps of Bicycle Valves.
I, HENRY WALLACE DOVETON DUNLOP, of Viewmount, Lucan, Co. Dublin, in
Ireland, Civil Engineer, do hereby declare the nature of this invention to be as
follows:-
Instead of attaching the caps of the bicycle valves by a chain to the spokes
of the machine, I fasten them by means of very flexible springs or rubber to the
spokes or rim of the machine in such a way that when the dust-cap is unscrewed
from the valve, the springs or rubber raise it out of the way of any one who
wishes to pump the tire. When required, the cap is pressed down again and
screwed on, the springs or rubber remaining in tension. I also arrange that the
milled portion for turning the cap shall be above. and not below the point of
attachment of the cap to the spokes or rim thus avoiding much difficulty in 'screw-
ing or unscrewing the cap.
An Improvement in the Attachment of Dust-caps of Bicycle Valves.
I, HENRY WALLACE DOVETON DUNLOP, of Viewmount, Lucan, Co. of Dublin, in
Ireland, Civil Engineer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
Instead of attaching the dust-caps of bicycle valves by means of a chain, I
attach them. to the spokes or rim of the wheel or other part adjacent to the valve
by means of very flexible and elastic springs or pieces of rubber or rubber bands
or any other very flexible and elastic material in such a way that when the dust-
cap is on, the said elastic material is in tension and that when the cap is
unscrewed and becomes loose, the springs or elastic attachments pull the cap away
from the nozzle of the valve and out of the way of any one wishing to pump up
the tyre. When the pumping is finished the cap is brought back on to the nozzle
and screwed on again, the springs or elastic attachments being then in moderate
tension and ready to again remove the dust-cap when unscrewed again. I also
arrange that the milled portion of the dust-cap which is used for turning it shall
be above, and not below, the point of attachment of the springs or elastic materials
to the dust-cap, which attachment is not necessarily, but conveniently, made by
means of a metallic collar working loosely round the cap below the milled head;
073

page_text: on which collar are two little hooks in which the springs or elastic materials
engage.
For more perfectly describing the invention, I refer to the drawing of part of a
bicycle wheel accompanying this final specification in which A is the milled head
of the dust-cap, C is the collar H & H are the hooks into which the springs or
rubbers S & $ engage, which springs, which are in moderate tension when the
dust-cap is on, are fastened to the spokes sp & sp at the points B & B above
the cap or the points B¹ & B¹ or B & B below it; the springs or rubbers in the
latter cases taking the positions indicated by the dotted lines HB & HB".
When B & B are the points of attachment, the cap, when screwed off, is lifted up
and when B & B or B & B are the points of attachment, the cap, when screwed
off, is pulled down.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
r
1) An improvement. in the attachment of the dust-cap of the valves of bicycles
by means of springs rubbers or other elastic material to the spokes rim or other
part adjacent to the valve in such a manner that when the dust-cap is unscrewed,
it is pulled either up or down by the elastic material referred to, but, in any
case, out of the way of the valve nozzle, leaving same bare for the screwing on of
the inflater substantially as and for the purpose specified and shown by the
drawing.
2) A form of dust-cap in which the milled portion is above the point of attach-
ment of the dust-cap to the spokes, rim or other adjacent part preferably, though
not necessarily by means of a collar working loosely round the dust-cap under
the said milled portion and furnished with hooks into which rubbers springs or
other elastic materials engage for the purpose of attachment as aforesaid and
substantially as and for the purpose specified and shewn in the drawing.
Dated this 11th dor of Viarch 1900