Appliance for Protecting Pneumatic Tyres from Injury through Nails.
Year: 1894

page_text: Date of Application, 27th Apr., 1894-Accepted, 9th June, 1894
COMPLETE SPECIFICATION.
Appliance for Protecting Pneumatic Tyres from Injury through
Nails.
I, JAKOB KRUPPENBACHER, Manufacturer, of 3, Blaubach, City of Cologne,.
in the Province of Rhineland and Kingdom of Prussia, 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 :-
Considering the present state of cycle manufacture it is hardly to be doubted
that the use of pneumatic tyres in cycles will soon become universal. As is well
known the pneumatic tyre consists of an inner hollow hoop, filled with air and a.
protective hoop surrounding it. Although the latter is of considerable thickness,.
thus affording the inner hoop a great deal of protection against injury, yet it is.
impossible in riding over nails, bits of metal etc. with sharp edges to prevent the
latter from entering the outer tyre, gradually penetrating through it and finally
injuring the inner pneumatic tyre.
The object of my invention, which is represented in annexed drawing in Figs. 1
and 2, while the mode of its attachment to the frame of the cycle is shown in
Figs. 3 and 4, is to scrape off any pointed or sharp objects that may have attached
themselves to the tyre before they are able to injure the inner air hoop.
The appliance consists, as will be seen from Figs. 1 and 2 of a split metal
belt a a, surrounding one of the rods of the fork. The two parts of this belt are
connected by a hinge and one end is formed like a flat stem b, bent according to
the curve of the tyre. Conformably to the different sections of the rods of the
fork of which those of the front-fork are of an elliptical and those of the hinder
of a circular shape, the belt a, of the scraper protecting the front-wheel has an
elliptical while the other belt a has a circular form. Both belts are perforated at
the ends and provided with a screw by means of which they are-as will be seen
from Fige. 3 and 4-attached in such a manner to the rods of the fork that the
stems or scrapers lie with their concave side towards the pneumatic tyre at a.
slight distance from it.
Thus any object entering the tyre while it is in motion must strike against this:
stem after a semi-revolution of the wheel, and while the wheel continues to turn,.
be kept back by the stem i.e. be torn out of the tyre.
Of course the material as well as the form of the scraper may be subject to
various modifications. Thus instead of the one-sided attachment, as has been just
explained, a double one might be effected by placing a belt round each of the two
rods of the fork, the belts being connected by the stem which is bent according
to the curve of the tyre; the belt may also be bent out of one piece, although this.
is not to be recommended.
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 1.
claim is :
Appliance for protecting the pneumatic tyres of cycles from injury through
sharp objects as nails etc. which have entered it, consisting of a scraper b, attached
in a suitable manner and at a slight distance above the tyre of the cycle to the
rods of the fork.
Dated this Twenty-first day of April 1894.
For JACOB KRUPPENBACHER,
B. Brockhues.