An Implement for Use in Removing the Covers of Pneumatio Tyres,
Year: 1896

page_text: Date of Application, 18th Aug., 1898-Accepted, 17th Oct., 1896
COMPLETE SPECIFICATION.
An Implement for Use in Removing the Covers of Pneumatio
Tyres,
I, JOHN HORSWILL, Junior, of 3, James Street, Brook Street, Chester, Pork
Butcher, 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:-
It is the present practice to secure the cover of a pneumatic tyre of a cycle
wheel by means of two complete hoops of wire disposed within the rim of the
wheel and under which the edges of the cover are held when the air tube of the
tyre is inflated.
In order to gain access to the air tube it is necessary to remove the cover, which.
is done-after deflating the air tube-by prizing one of said hoops of wire upwards
and over the lip of the rim, and it is for this latter purpose that the subject of this
invention is applicable.
I am aware that implements are already employed as tyre extractors, but these
have the objection that they damage the wheel rim by buckling or bending it, and
it is to obriate this defect and to provide a more efficient extractor that this
invention has for its object.
In the drawing hereto annexed is illustrated a tyre extractor according to this.
invention, Figure 1 being an elevation of the same. Figure 2 is a cross section on
line A. B. Fig. 1. Figure 3 is a cross section on line C. D. Fig. 1, aud Figure 4 is.
a cross section on line E. F. Fig. 1.
It will be seen that the form of the extractor is approximately that of a cross,.
a being the cross-piece or fulcrum adapted to rest on the edge of the wheel rim
and provided with a curved groove b for this purpose, o the edge of the extractor
which is pressed between the tyre cover and the rim and under the securing wire,.
and d a groove in said edge adapted to receive said wire, whilst e is the handle of
the extractor.
The curvature of the cross-piece a and groove b is made to coincide with that
of the periphery of the rim of the wheel. The groove d may be similarly curved,.
but this is not essential.
By affording the fulcrum a a considerable breadth and by providing it with a
curvature and groove b to suit the wheel rim, liability to buckle or distort the rim
is obviated; and by providing the groove d to receive the wire the latter is.
prevented from slipping back into the rim when being prized out of it.
The edge o is preferably sharpened to enable it to pass freely under the tyre
cover and wire, but not so sharp as to cut the cover or tube.
The extractor may be formed of sheet steel stamped to the form required, or
may be made of cast metal.
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
laim is :-
An implement for use in removing the covers of pneumatic tyres having a broad
fulcrum with a groove and curvature corresponding with the rim of the wheel, and
groove adapted to receive the wires by which said covers are secured, arranged

page_text: and adapted to operate substantially in the manner herein described with reference
to the drawing hereto annexed.
Dated this 17th day of August 1896.
J. A. COUBROUGH,
Registered Patent Agent (qual. by exam.),
10, St. George's Crescent, Liverpool, Agent for the Applicant.