Improvements in and relating to Spring-tyres for Cycles.
Year: 1898

page_text: Date of Application, 2nd Apr., 1898-Accepted, 18th June, 1898
COMPLETE SPECIFICATION.
Improvements in and relating to Spring-tyres for Cycles.
We, HERMANN SIEGRIST, and EMILE MAIER, both of Brombach, Great Duchy
of Bade, Germany, Manufacturers, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement:-
-
The present invention relates to spring tyres for cycle wheels.
The annexed drawing given as an example, represents a method of performing
the invention.
In this drawing:
Fig. 1 shows a transverse section of the rim of a cycle wheel with the improved
spring tyre.
Fig. 2 is an elevation in perspective of a portion of the same rim showing the
tightening arrangement of the small lateral rims forming the support of the
spring.
Fig. 3 is an elevation of one of the two small lateral rims.
The special object contemplated by the present invention is to bring the point
of rest of the spring to the outside and to produce the tension thereof by means,
of small special rims which can be tightened so as to decrease their diameter; a
tension and an elasticity of considerable force is thus produced in the spring.
For this purpose the tyre is essentially composed of elastic blades or circles D
located in the rim B of the wheel as shown in Figs. 1 and 2.
On the outer blade of this endless spring is fastened the rubber tyre a forming
the rolling circle of the wheel.
On cach side of the spring and on the border of the rim is arranged a small
lateral band C, these lateral bands do not form a complete circle; they show at S
a break in continuity; the two ends of the band thus constructed are each pro-
vided with a foot por pl provided with holes (Figs. 2 and 3) into which passes
a screw E, provided with a tightening nut.
The arrangement of the two small lateral bands on the borders of the rim
(which borders pass through grooves arranged all around on each small band)
allows a slight slipping of this band on the rim when being tightened. A notch F
made in each band, as shown in Fig. 3, receives a small tenon g secured to the
rim B and preventing the said lateral bands from turning on the rim.
The section of the rubber-tyre is such, that this rubber tyre can slide between
the two lateral bands when the spring, acted on by the pressure of the said rubber-
tyre sinks more or less on the rim. The tightening of the rims C gives to the
spring D great tension and great elasticity.
The spring has no point of support inside but has it outside and this support
is formed, as we have seen above, by the returning borders bb of the small bands
placed above and enveloping the spring; at each pressure on the rolling surface
the spring tends to yield on the opposite side, but that is impossible on account
of the small bands placed above; the spring only yields as far as the little shrink-
able band leaves room for play above.

page_text: When the pressure ceases, the spring returns immediately to its original
position.
The walls of the rim are at an acute angle at m and m¹; whereby the spring,
when leaving its point of support, produces no sound and can remain freely
working without the least transverse oscillation.
Instead of using, as spring rims, elastic iron circles D, which increase the
weight of the cycle, thin wooden plates may be used, secured together, in suitable
numbers to form a spring sufficiently elastic and strong.
A simple wooden plate or blade may be used if it offers sufficient resistance
and clasticity.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is :-
1. A spring tyre for cycle wheels, of simple construction, allowing of great
tension and elasticity in the spring by means of special shrinkable rims, substan-
tially as described.
2. In a spring-tyre for cycles, the arrangement of elastic circles located in the
rim and to which the rubber-tyre, forming the rolling surface, is secured,
substantially as described.
3. In a spring-tyre for cycles the arrangement of two lateral bands adapted
to the borders of the rim of the wheel, and curved inwards to serve as external
point of support to the spring, these two bands being shrinkable by means of a
tightening-bolt, and giving consequently by this tightening a great tension to
the spring substantially as described.
4. In a spring-tyre for cycles the arrangement of the rim increasing in width
towards the interior of the wheel to leave a free passage to the spring in its move-
ments in the interior of this rim, substantially as described.
5. In a spring-tyre for cycles the replacing of the metal blades forming the
spring, by wooden plates or blades joined in a suitable number to offer the neces-
sary resistance and elasticity, or the use of a single wooden blade having the
same advantages, substantially as described and for the purpose set forth.
Dated this 30th day of March 1898.
L. DUVINAGE,
Patent Agent, 8, Rue des Princes, Brussels, Belgium.