Improvements in Pneumatic Tyres, and in Rims for the Improved Tyres.
Year: 1897

page_text: Date of Application, 30th Apr., 1897
Complete Specification Left, 27th Jan., 1898-Accepted, 2nd Apr., 1898
PROVISIONAL SPECIFICATION.
Improvements in Pneumatic Tyres, and in Rims for the Improved
Tyres.
I, THOMAS HENRY RAMSDEN, of Bramhope, near Leeds, in the County of York,
Land Agent, do hereby declare the nature of this invention to be as follows:-
The improvements refer to pneumatic tyres of the class openable for repair
upon the inside face, and do not require an inner tube. The kind of joint for the
improvements is not of the butt and flap description with the clincher mode of
grip; but is an overlap joint.
.
A treble grooved rim is provided, the treble groove consisting of two side
grooves and a deeper middle groove. An endless circular tyre piece of suitable
width for the overlap joint is made of rubber and insertion sufficiently strong
and flexible. Upon the outside face of the tyre piece parallel to one edge of it
a hoop is attached. This hoop is not solid but hollow all round. The hollow
hoop may be formed by rolling the insertion of the tyrepiece with the rubber face
of the outside forming the inside face of the hollow hoop: or the hoop may be
attached upon the outside face. The hollow hoop is flexible but made by insertion
to withstand latteral expansion. At the line of attachment of the hollow hoop
and tyrepiece one or more holes are made through the tyrepiece into the hoop.
The holes are valveless with metal eyelets. The hollow hoop being attached upon
the outside face, there are attached upon the inside face of the tyrepiece at or
near the edge of it two parallel solid ridges. Their distance apart is less than
the circumference of the hollow hoop, and they are of suitable cross section. The
two ridges may have within both or either of them, palfrey wire cores or cores
of built cane for preventing creeping. A like core for like purpose may be
alongside the hollow hoop. A pure rubber bead is solutioned upon the circum-
ference of the hollow hoop. There are also two ridges moulded upon the outside
face of the tyre piece which bed upon the edges of the rim. The hollow hoop
Also the wheel
must not be less in cross section than its groove, being nonelastic.
diameter of the groove in the rim must not be less than the diameter of the
hollow hoop. The inflating tube passes through the tyrepiece but not through
the hoop or circular joint. The tyre is mounted on the treble grooved rim with
the two ridges (having cores if any) against the two side grooves and the portion
between the ridges over the middle groove forming a yielding bed. The hollow
hoop upon the outside face being then inturned over the rim, is passed into the
yielding bed upon the inside face of the tyre over the middle groove. The inflating
pipe simultaneously fills the tyre and hollow hoop by the eyeletted holes, and
makes the initial joint with the rubber bead pressing on the groove: and the
tyre is locked upon the rim, the action of the tyre being rather a pull against
itself by the overlap joint than an outward thrust.
Also a rim with a single groove may be formed for the improved tyre of such
a pattern as if made from a circular metal tube by inwardly pressing the circum.
ference into a suitable groove as to size & shape. The tyrepiece for this rim

page_text: is similar to the one described for a treble grooved rim and has like parts and
provisions. However this tyrepiece may be without the two ridges upon the
inside face, and have its edge made thick wedgelike. The said thickened part
may have a core as previously described. The tyre is bedded in the groove of the
rim with the wedgelike edge against the side, and the hollow hoop is passed
into the groove and upon the inside face of the tyre similarly as before described.
The inflating tube enters the tyre at the side of the rim and not through the
hollow hoop upon the outside face of the tyrepiece. The inflation of the tyre
operates in similar manner. The ridges moulded outside the tyrepiece shew when
the tyre is in right position, and help to so retain it on the rim.
Dated this 29th day of April 1897
COMPLETE SPECIFICATION.
Improvements in Pneumatic Tyres, and in Rims for the Improved
Tyres.
I, THOMAS HENRY RAMSDEN, of Bramhope, near Leeds, in the County of York,
Land Agent, 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:-
My improvements relate to pneumatic tyres of the tubeless type having an
overlap air joint, and the object of my invention is to construct a tyre in such
a manner that it is more resilient, that its joint is more reliable and protected
from injury, than tyres hitherto constructed; whilst at the same time the said
tyre is not liable to fly off should it burst whilst travelling on the road.
In order that my invention may be clearly understood, I will proceed to
describe same with reference to the accompanying drawing, in which similar
letters refer to like parts in all the figures.
Figure 1 is a cross section of a tyre and rim constructed according to my inven-
tion shewing the tyre partly mounted on the rim, Figure 2 is a similar view
shewing the tyre in position and inflated, Figure 3 is a longitudinal section of a
portion of the tyre in position on the rim, and Figure 4 is a cross section of the
tyre opened out.
A is the rim having grooves B and C at the sides, and a groove D in the base
of same. E is an endless circular tyre-piece which may be made of rubber and
insertion, and F is an extended overlap portion which is provided with a ridge G
at its outer edge. His a hollow hoop which may be made by rolling the insertion
of the tyre-piece with the rubber face of the outside forming the inside face of
the hollow hoop H, or the hoop H may be made separately and may be attached
to the outside face of the edge of the tyre-piece E. The hoop II is flexible but
is made with material that withstands lateral expansion. At the line of attach-
ment of the hoop H with the tyre-piece E, eyeletted holes J are provided which
may be formed in an annular series round the hoop, thus giving free communica-
tion between the interior of the hoop H and the interior of the tyre-piece E.
K and L are two ridges for resting on the edges M and N of the rim A, thus
facilitating the fitting of the tyre. A pure rubber bead P is solutioned or other-
wise fixed to the circumference of the hoop H, for the purpose of forming a sealed
joint with the adjacent surface of the overlap, on the inflation of the tyre; or the
said bead could be attached to the interior surface of the overlap F, if desired.
An annular recess R is formed in the rim A for the purpose of receiving the
ridge G of the overlap portion F, which ridge G may be provided with a built

page_text: cane or other non-extensible core for the purpose of holding it firmly in position
and for preventing creeping. The hollow hoop H being non-elastic, must not
be less in cross section than the space between the grooves B and C.
The overlap portion F is placed in the rim A and stretches across the groove D
with its sides against the interior of the grooves B and C, and the ridge G is
inserted in the recess R. The tyre-piece E is then turned over into the position
seen at Figure 1, and the hollow hoop H is then pressed into the rim A upon
the inner face of the overlap portion F, the ridges K and L being set in their
required positions and resting on the edges M and N of the rim A. The air as
it is forced in, simultaneously fills the tyre proper and hollow hoop by passing
through the eyeletted holes J, thereby making the joint with the rubber bead P
pressing on the overlap F over the groove D, and holding the exterior surface
of the hoop H firmly in contact with the interior surface of the overlap portion F.
It will be readily seen that the above described construction of a pneumatic
tyre, gives a large surface at the joint, which besides making the same more
secure enables it to be repaired at will should it become injured. The joint is
also entirely within the hollow of the rim, thus protecting it from injury; and
as the hollow hoop and the interior of the tyre proper are in free and immediate
communication, a large air space is obtained with a consequent result of great
resilience.
If desired a second annular recess could be formed on the opposite side of the
rim A to that occupied by the recess R, in which case a rib would be formed in
the overlap portion for resting in the said recess.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
1. In a pneumatic tyre of the tubeless type, the extended overlap F in combina-
tion with the hollow hoop H having eyeletted holes J in the same, substantially
as and for the purposes set forth.
2. In a pneumatic tyre of the tubeless type, the extended overlap F and ridge G
at one side of the tyre-piece E, and the hollow hoop H at the other side of the said
tyre-piece, in combination with a suitable rim whereby a good joint may be
secured between the overlap F and the hollow hoop H, substantially as and for the
purposes set forth.
3. In a pneumatic tyre of the tubeless type, the rim A. having grooves B, C
and 1 and an annular recess R, in combination with the tyre-piece E, extended
overlap having ridge G, hoop H having eyeletted holes J, and rubber bead P,
substantially as and for the purposes set forth.
4. In a pneumatic tyre of the tubeless type, the rim A having grooves B, C
and D, edges M and N, and an annular recess R, in combination with the tyre-
piece E having ridges K and L, extended overlap F having ridge G, hoop H
having eyeletted holes J and rubber bead P, substantially as and for the purposes
set forth.
BREWER & SON,
London and Leeds, Agents for the Applicant.