Improvement in Elastic Tyres.
Year: 1899

page_text: Improvement in Elastic Tyres.
I, ROBERT DUCASBLE, of 35, Rue Guersant, Paris, France, Merchant, do hereby
declare the nature of this invention to be as follows:-
My invention has for its object an elastic tyre for carriage, cycle and other
wheels, but it is more especially intended for the wheels of autocars.
Pneumatic tyres, although they present indisputable advantages as regards
resiliency and comfort for the rider, offer, however, at least for road purposes,
drawbacks which have caused certain manufacturers to prefer solid or hollow
rubber tyres.
These latter tyres however also offer the drawback, that when they have been
used for a certain time and require to be changed, it is necessary to replace
them altogether because they are made of a single piece, and such replacing
becomes naturally costly. Furthermore solid or hollow rubber tyres are generally
difficult to set in their rims and the ordinary means employed to set them,
when it is not desired to cement them, are more or less complicated, and often
necessitate specially shaped rims.
My invention has for object to provide a detachable elastic tyre either solid
or hollow which shall not be liable to come off and which can be adapted to
any ordinary kind of rim for pneumatic tyres, both for cycles and for carriages;
it has, furthermore, for object to allow the replacing only the external part of
the tyre after it shall have become worn, thus reducing considerably the cost of
keeping the tyre in repair.
To these ends, my tyre is made of two parts, that is to say of an internal part
or core made of ordinary, or sponge rubber, either solid or hollow, and of an
external part forming an envelope which is held in the rim by means of beads.
in the same manner as ordinary pneumatic tyres, which envelope may be replaced
when it is worn out, without it being necessary to replace the inner rubber core.
In order that my invention and the manner of carrying it out may be clearly
understood, I have illustrated it in the annexed drawing, in which
Fig. 1 is a transverse section of a tyre made in accordance with my invention,
and having a solid core.
Fig. 2 is a similar view showing my tyre provided with a hollow core.
The same letters of reference represent the same parts in the two figures.
a is the rim of the wheel, which may be of any shape or size desired, according
to the use for which it is intended. By way of example, I have shown in the
drawing a rim similar to those used for ordinary pneumatic tyres.
b is the core of the tyre, which may be constituted by a ring of solid rubber
(Fig. 1) or hollow rubber (Fig. 2), or it may be made of sponge rubber in order
to afford more elasticity to the tyre. Around this core is an external part or*
envelope made of a strong rubber coated canvas, similar to the envelope of
ordinary pneumatic tyres.
The beads
formed upon the envelope c serve to hold it firmly in the rim a.

page_text: In order to detach the tyre, the part d forming the bead is compressed by
means of a suitable tool until that part which is engaged in the concave part of
the rim is disengaged therefrom. In order to fix the tyre on to the rim, operate
inversely by compressing the said part d to oblige it to enter into the said con-
cave part of the rim.
Dated this 5th day of October 1899.
I, ROBERT DUCASBLE, of 35, Rue Guersant, Paris, France, Merchant, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
My invention has for its object an elastic tyre for carriage, cycle and other
wheels, but it is more especially intended for the wheels of autocars.
Pneumatic tyres, although they present indisputable advantages as regards
resiliency and comfort for the rider, offer, however, at least for road purposes,
drawbacks which have caused certain manufacturers to prefer solid or hollow
rubber tyres.
These latter tyres however also offer the drawback that when they have been
used for a certain time and require to be changed, it is necessary to replace
them altogether because they are made of a single piece, and such replacing
becomes naturally costly. Furthermore solid or hollow rubber tyres are generally
difficult to set in their rims and the ordinary means employed to set them,
when it is not desired to cement them, are more or less complicated, and often
necessitate specially shaped rims.
My invention has for object to provide a detachable elastic tyre either solid
or hollow which shall not be liable to come off and which can be adapted to
any ordinary kind of rim for pneumatic tyres, both for cycles and for carriages;
it has, furthermore, for object to allow the replacing only the external part of
the tyre after it shall have become worn, thus reducing considerably the cost of
keeping the tyre in repair.
To these ends, my tyre is made of two parts, that is to say of an internal part
or core made of ordinary, or sponge rubber, either solid or hollow, and of an
external part forming an envelope which is held in the rim by means of beads,
in the same manner as ordinary pneumatic tyres, which envelope may be replaced
when it is worn out, without it being necessary to replace the inner rubber core.
In order that my invention and the manner of carrying it out may be clearly
understood, I have illustrated it in the drawing annexed to my Provisional
Specification, in which
Fig. 1 is a transverse section of a tyre made in accordance with my invention,
and having a solid core.
Fig. 2 is a similar view showing my tyre provided with a hollow core.
The same letters of reference represent the same parts in the two figures.
a is the rim of the wheel, which may be of any shape or size desired, according
to the use for which it is intended. By way of example, I have shown in the
drawing a rim similar to those used for ordinary pneumatic tyres.
bis the core of the tyre, which may be constituted by a ring of solid rubber

page_text: (Fig. 1) or hollow rubber (Fig. 2), or it may be made of sponge rubber in order
to afford more elasticity to the tyre. Around this core is an external part or
envelope made of a strong rubber coated canvas, similar to the envelope of
ordinary pneumatic tyres.
The beads d formed upon the envelope c serve to hold it firmly in the rim a.
In order to detach the tyre, the part d forming the bead is compressed by
means of a suitable tool until that part which is engaged in the concave part of
the rim is disengaged therefrom. In order to fix the tyre on to the rim, operate
inversely by compressing the said part d to oblige it to enter into the said con-
cave part of the rim.
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 an elastic detachable tyre, the combination, with a rim, of a solid
rubber core, an envelope covering the said core and means for holding the
said envelope to the rim, substantially as, and for the purposes set forth.
2. The combination, with a rim having concave parts, of an internal part of
a rubber tyre covering the said rim and of an envelope or external part covering
the said internal part, the said envelope having beads which are engaged in
the said concave parts of the rim, so as to hold the tyre in position, sub-
stantially as described and illustrated.
3. A detachable elastic tyre comprising a core or internal part made of hollow
rubber and an envelope or external part covering the said core and provided
with projecting beads which engage in corresponding cavities in the rim, so
as to hold the said internal part in position, substantially as described and illus-
trated.
4. A wheel-tyre of the kind described having a core or inner part made of
sponge rubber, an envelope or external part covering the said core, and means,
substantially as described, to hold the said envelope to the rim, all substantially
as described and shown.
5. The hereindescribed detachable elastic tyre constructed and arranged as
described and shown.
Dated this 8th day of June 1900.
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant.