An Improved Device for Detaching Pneumatic and other Tyres.
Year: 1897

page_text: Date of Application, 12th Aug., 1897
Complete Specification Left, 12th May, 1898-Accepted, 12th Aug., 1898
PROVISIONAL SPECIFICATION.
An Improved Device for Detaching Pneumatic and other Tyres.
I, JAMES ARCHIBALD EVAN DORAN, of 5, Acorn Terrace, Sheerness, Shipwright,
do hereby declare the nature of this invention to be as follows:―
This invention relates to a device to be employed for detaching wired on pneu-
matic or other tyres, and its object is to provide a small and inexpensive article
which will allow the tyre to be detached with ease and without danger of injury.
The device consists of a small bar of metal or other suitable material, slightly
rounded at one end, this end being inserted under the wire. The other end is
provided with a small flange or is bent up so as to project out at right angles to
the remainder of the bar. This extension is formed with a small slot or notch
which may be curved or straight.
This arrangement allows the article to be connected at one end to one of the
spokes of the wheel after the other end has been inserted under the wire and levered
up to the required extent. Both hands of the person using the article are thus free,
while the device prevents the tyre partly detached from slipping back into fixed
position. At the same time the strain is kept on the cover, which will tend when
the hands are worked round the tyre in the ordinary manner to draw the wired
edge of the cover at the part of the wheel opposite the detaching device into the
bed, centre channel, or top of the rim facilitating the removal. The bar so
employed may be straight or curved and the part connected to the spoke may of any
suitable shape sufficiently strong to prevent danger of bending or breaking.
Dated this 12th day of August 1897
GEO. H. RAYNER,
37,. Chancery Lane, London, Agent for the Applicant.
An Improved Device for Detaching Pneumatic and other Tyres.
'
I, JAMES ARCHIBALD EVAN DORAN, of 5, Acorn Terrace, Sheerness, Shipwright,
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:-
-
The object of this invention is to facilitate the removal from the rim of the
wheel, of a pneumatic tyre of the kind of which the cover has inextensible or
wired edges.
Such tyres are difficult to remove and it is common to employ the handle of a
tooth-brush or of a spoon or some other convenient implement as a lever for

page_text: springing the inextensible wired edge of the cover over the edge of the wheel rim.
But in order to accomplish this it is usually necessary to employ more than one
such lever at different points situated some distance apart around the rim, and no
implement specially adapted for the purpose has been provided which is self-
retaining in operative position after drawing the wired edge of the cover up to the
edge of the wheel rim during the application of leverage by a second or a third
similar implement at another point or points of the tyre.
The object of my invention is to supply this want by means of an implement
(preferably used in a set of three) one end of which is inserted beneath the wired
edge of the tyre cover and takes a fulcrum on the edge of the wheel rim while
the other end is engaged with a spoke (or it may be any other part) of the wheel
after the leverage has been exerted and is thereby retained in operative position
against the strain of the wired edge of the cover without any adventitious assist-
ance, whilst the operation is being repeated at other points of the tyre by means
of other similar implements.
My invention will be described with reference to the accompanying drawings
forming part of this specification wherein Figure 1 represents a perspective view
of one of the implements and Figure 2 a perspective view of a portion of a tyre
shewing the mode of using three such implements.
The implement, as will be seen, consists of a thin flat bar A preferably of bar
steel, one end a of which is adapted to be inserted beneath the wired edge c of the
tyre cover C and the other end to engage with the spoke of the wheel by being
bent down at right angles to the plane of the bar A, as shewn at E, this downwardly
bent part being provided in one edge (or both edges) with a hook-shaped notch e
which may easily be engaged with a spoke to retain the implement in operative
position after the other end a has been inserted beneath the edge of the tyre cover.
The end a is rounded to avoid injury to the air tube in using the implement.
The mode of using the implement is as follows:--After deflation of the tyre
the rounded end a of the implement is inserted beneath the wired edge of the cover
so that it rests upon the edge d of the wheel rim at a point in line with one of the
spokes. A second and a third implement are similarly inserted and the three
are used in succession as levers and engaged by their notches e with the adjacent
spokes in order to retain them in position, whereby a considerable length of the
cover will be sprung over the edge of the wheel rim generally to an extent sufficient
for the entire removal of the tyre, or if not the middle implement may be similarly
applied in another position beyond the two.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is:
The herein described implement for use in removing tyres from wheels, consisting
of a bar one end of which is adapted to be inserted beneath the edge of the tyre
cover and to rest on the edge of the wheel rim and the other end of which is
adapted to be engaged with a spoke or other part of the wheel substantially as
specified.
от may 1050.
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.