Improvements in Pneumatic Tyres.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in Pneumatic Tyres.
1, HORATIO JOHN HEINZE Mechanical Engineer, of 16 East Road, City Road,
in the County of Middlesex, do hereby declare the nature of this invention to be
as follows:-
This invention relates to a pneumatic tyre having an air tube and independent
detachable outer cover. The cover is formed near the edges with a projecting rib
adapted when in position on the rim to engage with the edge of the latter so as to
determine the proper position of the cover upon the rim. Each edge of the cover
is enlarged or rendered inextensible conveniently by a wire hoop or other
equivalent means, and is adapted to lie inside and underneath the edge of the rim
which is turned inwards for this purpose. The edge of the rim may be enlarged
or rounded so as to prevent cutting the tyre and lies between the actual edge of the
cover and the betorementioned rib.
The actual shape in cross section of the rim may be varied.
When in use the edges of the cover are pressed by the expanding air tube
against the inner walls of the rim and since they engage with the outer face of the
cover against a projecting upper surface, there is no danger of nipping the air tube
while a particularly firm' bearing is provided for the edge which is thus not.
liable to be blown off the rim, while the beforementioned ribs serve to determine
the proper position of the cover when it is applied to the rim, and to retain
is there during the inflation process as well as to keep. out wet and dirt from
the tyre.
The wires can be coated with guttapercha rubber or other material to prevent
the wires from rusting and protect the fabric.
Although I prefer the above described arrangement I may use this invention
with an outwardly turned rim such for example as the ordinary Dunlop rim.
Dated this 29th day of May 1896.
BOULT & WADE,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Pneumatic Tyres.
I, HORATIO JOHN HEINZE, Mechanical Engineer, of 16 East Road, City Road,
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 relates to a pneumatic tyre having an air tube and independent
detachable outer cover. The cover is formed near the edges with a projecting rib
adapted when in position on the rim to engage with the edge of the latter so as to

page_text: determine the proper position of the cover upon the rim. Each,edge of the cover-
is enlarged or not and rendered inextensible conveniently by a wire houp or other
equivalent means, and is adapted to lie inside and underneath the edge of the rim
which is turned inwards for this purpose. The edge of the rim may be enlarged
or rounded so as to prevent cutting the tyre and lies between the actual edge of the
cover and the beforementioned rib.
The actual shape in cross section of the rim may be varied.
When in use the edges of the cover are pressed by the expanding air tube
against the inner walls of the rim and since they engage with the outer face of the
cover against a projecting upper surface, there is no danger of nipping the air tube
while a particularly firm bearing is provided for the edge which is thus not
liable to be blown off the rim, while the beforementioned ribs serve to determine
the proper position of the cover when it is applied to the rim, and to retain
it there during the inflation process as well as to keep out wet and dirt from
the tube.
The wires can be coated with guttapercha rubber or other material to prevent-
the wires from rusting and protect the fabric.
. Although I prefer the above described arrangement I may use this invention
with an outwardly turned rim such for example as the ordinary Dunlop rim.
In the accompanying drawings,
Figure 1, is a transverse section of the improved tyre applied to a rim.
Figure 2, is a similar view of an alternative construction.
The cover A has its edges A' enlarged or rendered inextensible by cords or
wires B..
Near these edges, upon the exterior of the cover, are formed, by moulding, or
otherwise, longitudinal ribs C.
The rim D is formed preferably with inturned edges D' and in the form shown
in Figure 1 with two lateral channels D,
When the tyre is in position on the rim the inextensible edges A' lie beneath
the inturned edges D' of the rim, the ribs C lying on the outside of the rim in the
manner shown.
Upon inflation of the air tube E the edges of the cover are caused to
engage the edges of the rim in such a manner that the tyre is not liable to be
blown off.
The lateral channels D2 in the rim enable the cover to be removed after
the tyre is deflated by forcing the rib C at one point within the edge of the
rim when the inextensible edge A' can be drawn off the edge of the rim on
the opposite side of the wheel in the manner customarily employed with a Dunlop
or similar tyre.
In the construction illustrated in Figure 2 in addition to providing the edges A¹
of the cover with inextensible cords or wires B similar wires F are arranged in the
ribs C. The rim D is here shown of somewhat different shape to that illustrated
in Figure 1 the edges D' however being inturned and the operation of the tyre
being substantially the same.
If desired other shapes of rim may be employed the construction however being
such as to allow of the edges of the cover being drawn away from the bottom of
the rim upon inflation of the tyre so as to prevent the air tube being nipped, while
the ribs and overlapping edges of the rim regulate the position of the cover in
addition to preventing the entrance of dust, dirt or the like.
Having now particularly described and ascertained the nature of the said iuven-
tion and in what manner the same is to be performed, I declare that what
claim is
1. The combination with the inextensible edges of a pneumatic tyre cover of
ribs such as C substantially as and for the purpose described.
2. The combination with the inextensible edges of a pneumatic, tyre cover of
inextensible ribs such as C substantially as and for the purpose described.

page_text: 3. An outer cover for a pneumatic tyre with ribs such as C formed upon it.
and inextensible edges enlarged or not substantially as and for the purpose.
described.
4. The complete pneumatic tyre and rim substantially as described and illustrate 1.
in Figure 1 or Figure 2, of the accompanying drawings.
Dated this 29th day of March 1897.
HORATIO JOHN HEINZE...
Boult & Wade,
Agents for the Applicant.