Improvements in or relating to the Repairing of Pneumatic Tyres or other Indiarubber Goods.
Year: 1894

page_text: Date of Application, 16th Jan., 1894-Accepted, 17th Feb., 1894.
COMPLETE SPECIFICATION.
Improvements in or relating to the Repairing of Pneumatic Tyres
or other Indiarubber Goods.
I, CHRISTIAN HAMILTON GRAY of the Indiarubber, Guttapercha, and
Telegraph Works Company Limited, of Silvertown, Essex, 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:-
This invention relates to the repairing of pneumatic tyres or the like and will
be best understood by reference to the accompanying drawings in which :-
Figure 1 is a tool which I employ for smoothly cutting out a damaged or
punctured part of a tyre the cutter of said tool being, in this view, for convenience
shown as disengaged from the operating handle or uut.
Figure 2 is a sectional elevation showing the parts in their operative position
the cutter being against the block as it would be at the completion of the cutting
operation.
Figure 3 is a perspective view of one of the plugs for the pneumatic tyre and
Figure 4 is a section showing one of the plugs applied to a pneumatic tyre.
Like letters indicate like parts throughout the drawings.
.
Referring to Figures 1 and 2 A is a block of preferably taper or approximately
conical form the larger end or base of which is flat and from which extends a screw
stem B on which is threaded a winged nut or handle C.
D is a substantially-cup-shaped sleeve or cutter having a central hole in its non-
cutting end so as to enable it to move freely along and around the screw stem B ;
at this end the cutter D is provided with a recess D' extending diametrically across
it and adapted to receive the lugs C¹ projecting from the adjacent side of the nut C.
By this construction it will be readily seen that when the nut C is turned the
cutter D will turn with it.
Referring now to Figures 3 and 4 the plug there shown consists of a conical point
or end E a flanged head E' and a neck E' connecting E and E¹. These plugs
which for convenience are hereinafter referred to by the letter E are made in
various sizes according to the size of the hole it is found necessary to cut in the
tyre a number of cutters D of different sizes being applicable to each tool to cut
holes of different diameters; thus assuming that it is found necessary to cut a hole
of inch diameter a cutter having approximately that diameter would be used
and a plug E having a neck E of approximately that diameter would be used to
close the hole.
Instead of forming the cutter D separate from the handle or nut C I may
permanently secure it thereto or form it in one piece therewith; the former
arrangement is however preferred as, with such a device it is necessary to change
only the cutter when requiring to cut an opening of different size and not the nut
as would be necessary if the cutter were in one with said nut.
In repairing a puncture according to this invention the nut C is screwed along
the stem B so that the cutter D may be removed from, or rest loosely against the
base of the block A. The block A is then pushed, pointed end foremost, through
the puncture until the surrounding edge of said puncture by the elasticity of the
rubber F closes in over the base of the block and around the stem B. The nut C,
with the cutter D engaged with it, is then screwed towards the rubber so that
besides moving in an axial direction said cutter is also rotated with the result that
circular piece of the rubber F of approximately the same diameter as the cutter
8 smoothly cut out by the time that the cutting edge of D bears upon the base
of A. The cutting tool Figures 1 and 2 is then removed from the opening formed

page_text: in the tyre. A plug E having a neck E' of approximately the same diameter as
the opening in the tyre is then coated with solution around its neck and over the
opposite faces of its conical point or end E and flanged head E' and solution may
also be applied to the edge of the opening to be plugged.
The plug E is then pushed, pointed end E' foremost, through the opening and
immediately after E' has passed through it the rubber F will close in tightly
around the neck E' and the plug E will be secured in position with E at the inside
of the tyre and the flanged head E' at the outside. The head E¹ is made thin so
as not materially to affect the tread surface of the tyre.
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
claim is :-
1. Repairing a pneumatic tyre or other article of indiarubber without the
assistance of a tool for inserting the plug by applying solution and forcing into
the hole a conical plug having a reduced neck to receive the wall of the repaired
article and a flange substantially as described.
2. A tool or instrument for cutting out portions of rubber articles consisting of
a conical head such as A screwed stem B sleeve or cutter D D¹ and nut CC
substantially as described and illustrated in the accompanying drawings.
3. In a tool or instrument for cutting out portions of rubber articles the
combination with a nut or handle screwing on to a spindle or stem projecting
through the fabric to be cut of a cutter turning with the said nut substantially as
described and illustrated in the accompanying drawings.
4. In a tool or instrument for cutting out portions of rubber articles the
combination with a screwed stem of a cutter adapted to be rotated upon the stem
and to advance as it rotates substantially as described.
5. In a tool or instrument for cutting out portions of rubber articles the
combination with a screwed stem of a circular cutter screwing as a nut upon the
stem substantially as described.
6. In a tool or instrument for cutting out portions of rubber articles the
combination with a conical head adapted to be pushed through the puncture
and a screwed stem projecting from the head and through the puncture of a
circular cutter adapted to be screwed against and to cut through the rubber
substantially as described.
7. The combination with a punctured pneumatic tyre or other rubber article of
a plug such as E E' E' substantially as described and illustrated in the accom-
panying drawings.
8. A plug for repairing rubber articles consisting of a conical head a reduced
neck and a flange substantially as described and illustrated in Figure 3 of the
accompanying drawings.
Dated this 16th dex of January 1804