Improvements in Spring Wheels for Velocipedes.
Year: 1897

page_text: PROVISIONAL
SPECIFICATION.
Improvements in Spring Wheels for Velocipedes.
I, ERIK JOHAN DAHLGREN, of Langsele, Lapland, in the Kingdom of Sweden,
Postillion, do hereby declare the nature of this invention to be as follows:-
This invention relates to a wheel for velocipedes wherein an outer ring or
rim is allowed movement in a radial direction and is supported upon steel springs
which press against a rigid inner ring or rim. The outer ring is guided by
spokes which are secured thereto and pass freely through the inner ring but are
not secured to the nave of the wheel.
The outer ring which is formed of spring steel can move freely as it is supported
by the inner ring, which is also of spring steel, by means of the springs which
are of an S-shape and preferably made narrower in the centre. The said springs
are secured at one end to the inner periphery of the outer ring, the other ends
of the said springs being free to slide upon the inner ring. The inner ring or rim
is rigidly connected with the nave of the wheel by means of spokes and the outer
ring or rim is provided with four pairs of guide-spokes which pass through holes
in the inner ring and extend to the nave of the wheel without, however, being
connected to the ring or to the wheel nave.
In some cases the guide-spokes do not extend as far as the nave which can then
be made considerably larger than usual and be provided with holes in which the
spokes can freely move. Or in order to support the guide-spokes which do not
extend as far as the nave the rigid spokes can be provided with guides furnished
with holes in which the guide-spokes can freely move. One of these guides is
arranged in front of each pair of guide-spokes which pass through it.
When a wheel constructed as above described rolls upon the ground the outer
ring can yield as the springs successively bend under pressure and approach the
inner ring, the said springs, however, constantly tending to force the outer ring
to lie concentrically with the inner ring.
The springs are advantageously fixed in position by screws and nuts so that a
damaged spring can be easily replaced by a new one. A ring or tyre of india-
rubber may be applied to the outer ring; the said india-rubber tyre or ring
preferably having a flat inner periphery and a convex outer periphery provided
with a groove.
As the arrangement of springs around the periphery of a wheel is already
known I do not broadly claim the employment of springs.
1007
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Spring Wheels for Velocipedes.
F
I, ERIK JOHAN DAHLGREN, of Langsele, Lapland, in the Kingdom of Sweden,
Postillion, 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 wheel for velocipedes wherein an outer ring or
rim is allowed movement in a radial direction and is supported upon steel springs
which press against a rigid inner ring or 'rin: The outer ring is guided by
spokes which are secured thereto and pass freely through the inner ring but are
not secured to the nave of the wheel.
In the accompanying drawing,
1
Figure 1 is a side elevation of the outer ring or rim, springs and guide-spokes.
Figure 2 is a side view of a complete wheel made according to the invention.
Figure 3 shews to a larger scale one of the springs in edge and front view.
Figure 4 is a perspective view of the outer ring or rim and its guide-spokes;
and
Figures 5 and 6 are views of details drawn to a larger scale.
The outer ring or rim a, which is formed of spring steel, can move freely as
it is supported by the inner ring b, which is also of spring steel, by means of the
springs c which are of an S-shape and preferably made narrower in the centre
that at the ends as clearly shewn in Figure 3. The springs c, c are secured at one
end to the inner periphery of the outer ring a the other ends of the said springs
being free to slide upon the inner ring . The inner ring or rim 6 is rigidly
connected with the nave of the wheel by means of spokes d and the outer ring
or rim a is provided with four pairs of guide-spokes f which pass through holes
in the inner ring 6 and extend to the nave of the wheel without, however, being.
connected to the ring b or to the wheel nave.
In the arrangement shewn the guide-spokes f do not extend as far as the nave
which can therefore be made considerably larger than usual and be provided
with holes in which the spokes can freely move. Or, in order to support the
guide-spokes, which do not extend as far as the nave, the rigid spokes d can be
provided with guides 9 of the shape shewn in Figure 5 and furnished with
holes in which the guide-spokes f can freely move. One of these guides is
arranged in front of each pair of guide-spokes which pass through it.
When a wheel constructed as above described rolls upon the ground the outer
ring a can yield as the springs c successively bend under pressure and approach
the inner ring b, the said spring c, however, constantly tending to force the outer
ring a to lie concentrically with the inner ring b.
The springs c, c are advantageously fixed in position by screws and nuts so
that a damaged spring can be easily replaced by a new one. A ring or tyre
of india-rubber may be applied to the outer ring a, the said india-rubber tyre
or ring preferably having a flat inner periphery and a convex outer periphery
provided with a groove as shewn in Figure 6.
'
As the arrangement of springs around the periphery of a wheel is already
known I wish it to be understood that I do not broadly claim the employment of
springs.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
1 A wheel for velocinedes consisting of two rings a and b arranged concen-

page_text: to the nave of the wheel by means of spokes d whilst the outer a rests upon the
ground and is provided with spokes f which pass freely through the inner ring
and are not connected with the nave of the wheel, springs c being arranged between
the rings so as to support the outer ring and form an elastic wheel, substantially
as herein before described and illustrated.
2. In a wheel of the kind described in Claim 1 the arrangement of the guides g
secured to the spokes which are fixed to the inner ring, through which guides
the spokes attached to the outer ring freely pass, substantially as and for the
purpose herein before described and as illustrated.
3. In a wheel of the kind described in Claim 1 arranging the guide-spokes in
pairs and causing them to freely pass through the inner ring and through the
guides g secured to the spokes of the said inner ring, substantially as described
and illustrated.
T
1
A
1000
1000.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.