Improvements relating to the Repairing of Elastic Tyres and to Devices for use therein.
Year: 1892

page_text: Date of Application, 27th Sept., 1892-Accepted, 29th Sept., 1892
COMPLETE SPECIFICATION.
[Communicated from abroad by BOSTON WOVEN HOSE AND RUBBER COMPANY,
of Boston, Massachusetts, United States of America.]
Improvements relating to the Repairing of Elastic Tyres and to
Devices for use therein.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent Agents,
45, Southampton Buildings in the County of Middlesex, 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 has for its object to enable a small puncture or fracture in a
pneumatic tire to be quickly and durably closed, and in such manner that there
will be no protuberance on the external surface of the tire, and no liability of the
re-opening of the puncture by the action of solar heat. The invention consists
in the improved method hereinafter described and claimed.
Of the accompanying drawings, forming part of this Specification:
Figure 1 represents a transverse section of a pneumatic tire, showing a puncture
through the wall of the tire.
Figures 2, 3 and 4 represent similar views, showing different stages of the
operation.
Figure 5 represents a section showing the tire after the completion of the
repairing operation.
The same letters of reference indicate the same parts in all the figures.
In the drawings:
a represents a pneumatic tire, and a¹ a puncture therein.
In carrying out my invention, I close the puncture by injecting into it a plug p,
composed of a material or composition which is rendered plastic and adhesive by
a degree of heat considerably exceeding that caused by the sun; but becomes
elastic without being plastic when exposed to maximum degrees of solar heat, say
about 110 degrees Fahrenheit or less, a suitable material or composition being
unvulcanized rubber gum. The plastic plug may be conveniently injected into
the puncture by heating the composition or gum in a syringe or cylinder &
having an attenuated nozzles formed to be inserted in the puncture.
b represents a piston, which is fitted to move in the receptacles, and, when
moved toward the nozzle s', is adapted to eject a portion of the viscid material
from the receptacles through said nozzle. The piston b is provided with a
screw-threaded stem b', which is engaged with an internally screw-threaded nut c.
Said nut is formed at its inner end to enter and slide lengthwise in the receptacles,
and is provided with a shoulder c³. The outer portion of the nut c is preferably
somewhat enlarged, and formed to be grasped and rotated either by the fingers or
a suitable wrench.
dd represent levers, which are pivoted at d'd' to ears formed on the receptacles.
Said levers are provided with short arms or projections d, which are engaged
with the shoulder on the nut c, as shown in Figure 2, the arrangement being
such that, when the levers d d are swung inwardly or toward each other, the short
arms or projections & will exert a powerful pressure upon the shoulder o* of the nut
in the direction required to force the piston b a short distance toward the nozzle
of the receptacles.
The nut constitutes a bearing for the short arms or projections & of the
levers d, so that the inward movement of said levers imparts an endwise movement
to the nut and through the latter to the piston.
It will be seen that the engagement of the levers dd with the nut c is such
that the nut can be readily rotated; consequently, when the operator desires to

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use the device, he inserts the nozzle in the orifice to be mended, then rotates the
nut c until the piston bears firmly on the viscid material in the receptacle, and
then, applying pressure to the levers d, swings said levers inwardly, thus giving
the piston a forward movement under strong pressure and causing the cement
to entirely fill or be forced under suitable pressure into the orifice. When the
levers are released and swung outwardly, the operator rotates the nut in the
direction required to force the shoulder c of the nut back against the outwardly
swung arms or projections of the levers, so that the levers are again enabled
to impart an additional forward movement to the nut and piston. The operation
is thus continued, the piston being moved forward step by step, each adjustment
of the nut enabling the levers to again move the piston forward, until the
material has been entirely used. The cylinder may be heated, by subjecting it
to the flame of an alcohol lamp. The nozzle is inserted a sufficient distance
into the puncture, and then the hot, plastic material is caused to exude in the form
of a plug p into the puncture, the nozzle being withdrawn during the operation, so
that the plug entirely fills the puncture, the material of the plug being cut off
about flush with the external surface of the tire.
It will be seen that the plastic and adhesive condition of the plug when it is
first injected, causes it to conform and adhere closely to the walls of the fracture,
the plug subsequently hardening sufficiently to resist the air pressure and the
softening action of solar heat.
I prefer to extend the plug inwardly into the interior of the tire, as shown in
Figures 2 and 3, and flatten the projecting end of the plug against the inner
surface of the tire, thus forming a head on the inner end of the plug. Said
head may be conveniently formed by indenting the tire, as shown in Figure 4,
until the inner end of the plug comes in contact with the inner surface of the
tire, this being done while the plug is in a plastic condition. The head prevents
liability of the plug being forced outwardly, and, by reason of its large area in
contact with the inner surface of the tire, makes the plug more effective.
I am aware that it has been proposed to inject rubber cement in a liquid
form into punctures in pneumatic tires; but said cement, containing a volatile
solvent of rubber, is liable to deteriorate more rapidly than rubber gum, and is
also liable to be softened and rendered useless by solar heat. Moreover, the
rubber cement cannot be manipulated in such manner as to form a head on the
inner surface of the tire.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me by
my foreign correspondents, I declare that what I claim is :
1st. The improved method of repairing pneumatic tyres, the same consisting in
injecting into the hole or fracture to be repaired a plug composed of a material or
compound substantially such as unvulcanized rubber gum rendered plastic and
adhesive by heat and thereby caused to adhere firmly to the walls of the fracture,
the plug becoming elastic when cooled and being capable of resisting the softening
action of solar heat, as set forth.
2nd. The improved method of repairing pneumatic tires, the same consisting in
injecting into the hole or fracture to be closed a plug composed of a material or
composition substantially such as unvulcanized rubber gum rendered plastic and
adhesive by heat, the inner end of the plug projecting into the interior of the
tire, and then, while the plug is in a plastic condition, forming its inner end
into a head bearing against the inner surface of the tire, as set forth.
3rd. A tire-mending device, comprising. a receptacle having an attenuated outlet
nozzle at one end, one or more power-applying levers pivoted to the receptacle,
and a piston movable in the receptacle and provided with an adjustable bearing
for said levers whereby the levers may be caused to advance the piston in the
cylinder step by step, as set forth.
4th. In a tire-mending device, the combination of a receptacle having an outlet

page_text: at one end, a piston movable in said receptacle and provided with a screw-threaded
shank, a nut engaged with said shank and adjustable thereon, and one or more
levers pivoted to the receptacle and engaged as described with the nut whereby
endwise pressure may be exerted on the nut and through the latter on the piston,
as set forth.
בד
7
ليوم
1
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.