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Патент USA US3026933

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March 27, 1962
P. PRINS
WHEEL RIM COMPRISING A DETACHABLE TIRE
3,026,923
BEAD SEAT RING AND LOCKING RING
Filed Oct. 4, 1960
‘a@l541
_
IN VEN TOR.
pm PM I
hired states Patent
I
3,026,923
Patented Mar. 27, 1962
1
2
3,026,923
FIG. 2, the angle between the main axes of the arms 11
and 12 is 90° and each of the angles between the main
WHEEL RIM COMPRHSRNG A DETACHABLE rmn
BEAD SEAT RENG AND LOCKING RDIG
Pier Prins, Dokkum, Netherlands, assignor to Prins N.V.,
Dokkum, Netherlands, a corporation of the Nether
lands
Filed Oct. 4, 1960, Ser. No. 60,404
5 Claims. (Cl. 152-410)
axes of the arms 11, 13 and 12, 13 is 135 °. The points
of contact of arm 11 with the ?ange 4 of the bead seat
ring, of arm 12 with the foot 5 of the bead seat ring, and
of arm 13 with the gutter 10 are designated by 14, 15
and 16, respectively. The normal forces P and Q, ap
plyinry at points 14 and 15, respectively, and coming
from the pressure exerted on the locking ring 8 by the
The invention relates to a wheel rim comprising a 10 bead of the tire, form together a resultant R passing ex
detachable tire bead seat ring which can be ?xed relative
actuly through point 16. It is to be noted that a free
to the base of the wheel rim by means of a locking ring.
interspace 15a is provided between points 14 and 15 and
The locking ring has two arms which are adapted to
the adjacent portions of the locking ring 8 and the bead
support the ?ange and the ‘foot of the bead seat ring, re
seat ring 3.
spectively, and leave a free interspace between the sup 15
The rounded portion 17 of arm 13 ‘forms an arc sub
porting points and another portion of the ring which ex
stantially equal to a semi circle. In the position ac
tends into a channel of curved cross-sectional con?gura
cording to FIG. 1 the centre 18 of the rounded portion
tion formed in the rim base, which base extends beneath
lies at the same position as the centre of the rounded
said ring.
portion of the gutter 10, and consequently beneath the
A wheel rim of this type is known. In this known 20 end 19 of said gutter. As indicated previously, the ra
wheel rim a locking ring is provided whose cross section
dius of curvature of arm 13 is less than the radius of
includes four arms. Two of the arms embrace the edge
curvature of channel 9.
of the channel and the pressure of the tire is transmitted
I claim:
to said edge via the bead seat ring.
1. A wheel rim, comprising a circumferentially con
The parts of the rim construction of the above-de 25 tinuous base having a channel of curved cross section, a
scribed type show, generally speaking, relatively large
detachable tire bead seat ring, and a locking ring for
deviations ‘from standard dimensions, since the rim base,
detachably maintaining said bead seat ring in position
relative to said base, said locking ring having a pair of
as well as the detachable tire bead seat ring and the
as
locking ring are rolled products. It may happen, there
spaced parts engaged with corresponding spaced parts
‘fore, that the original contact between the locking ring 30 on said bead seat'ring and having another part only ex
and the edge of the channel which, as seen in cross sec
tion, is a one point contact becomes a contact at two or
tending into said channel in engagement with one part
more points. This hinders the locking ring in tilting to
its exact position about the top of the channel edge, for
example, when the tire is in?ated after mounting.
The object of the invention is to eliminate this draw
back. To achieve this object the wheel rim is so con
ring having a curved cross section which has a radius of
curvature which is less than the radius of curvature of
said channel.
2. A wheel rim, comprising a circumferentially con
tinuous base, a detachable tire bead seat ring, and a
structed according to the invention that the portion of
the locking ring which extends into the channel is formed
locking ring for detachably maintaining said bead seat
ring in position relative said base, said locking ring hav
as a third arm supported in the curved portion of the
channel and has a radius of curvature smaller than that
of the channel in cross section.
ing a cross section of three extending arms only, two
of said arms being in engagement with said bead seat
only on said base, said extending part of said locking
ring at a pair of spaced points only on said bead seat
In theconstruction according to the invention there
ring, and said remaining arm being in engagement with
will always be a correct relative adjustment of the lock
said base at one point only on said base.
ing ring and the parts of the wheel rim.
3. A Wheel rim, comprising a circumferentially con
45
The invention will now ‘further be described with refer
tinuous base, a detachable tire bead seat ring, and a
ence to the accompanying drawing, showing an embodi
locking ring for detachably maintaining said bead seat
ment of the wheel rim according to the invention. In
ring in position relative said base, said locking ring hav
said drawing:
ing a cross section of three extending arms only, two
FIG. 1 represents an axial cross sectional view of part 50 of said arms being in engagement with said head seat
of the wheel rim, and
ring at a pair of spaced points only on said bead seat
FIG. 2 is an enlarged view of the locking ring in cross
ring, and said remaining arm being in engagement with
section and the section lines are omitted for the sake of
said base at one point only on said base, so that forces
clearness.
are applied to said locking ring at the corresponding
The wheel rim comprises a circumferentially continu 55 engaged points on said arms, said last mentioned points
ous rim base 1 with an integral ?ange 2 and a detachable
being positioned relative each other so that the resultant
tire bead seat ring 3. The latter is composed of a ?ange
of the forces applied to said corresponding pair of spaced
4 and a foot 5. The foot 5 is substantially the mirror
points on said locking ring passes through said remain
image of the foot portion 7 of the base relative to the
ing engaged point on said locking ring corresponding to
median transverse plane 6.
60 said point on said base.
After the tire (not shown) has been mounted, the de
4. A Wheel rim, comprising a circumferentially con
tachable bead seat ring 3 is placed axially onto the rim
tinuous base having a channel of curved cross section, a
base 1 to the position shown in FIG. 1, whereupon the
detachable tire bead seat ring, and a locking ring for
locking ring 8 (which is split in one place) is laid into
detachably maintaining said head seat ring in position
the channel 9, which is provided with a gutter v10 along 65 relative said base, said locking ring having a cross sec
the edge of the rim base which extends adjacent the
tion of three extending arms only, two of said arms
bead seat ring 3.
being in engagement with said bead ring at a pair of
In cross section the locking ring 8 has two arms 11
spaced points only on said bead seat ring, and said re
and 12 which bear laterally against the ?ange 4 of the
maining arm extending into said channel in engagement
bead seat ring and against the lower side of the foot 5 70 with said base at one point only on said base so that
of the bead seat ring, respectively, and a third arm 13
forces are applied to said locking ring at the corespond
which is accommodated in the channel 9. As shown in
ing engaged points on said arms, said last mentioned points
3,026,923
3
being positioned relative each other so that the resultant
of the forces applied to said corresponding pair of spaced
points on said locking ring, passes through said remain
£1
being positioned relative each other so that the resultant
of the forces applied to said corresponding pair of spaced
points on said locking ring passes through said remain
ing engaged point on said locking ring corresponding to
ing engaged point on said locking ring corresponding to
said point on said base.
5. A wheel rim, comprising a circumferentially con
tinuous base having a channel of curved cross section, a
said point on said base, said arm extending into said‘ chan
nel having a curved cross section which has a radius of
curvature which is less than the radius of curvature of said
channel.
detachable tire ‘bead seat ring, and a locking ring for
detachably maintaining said bead seat ring in position
relative said base, said locking ring having a cross sec 10
tion of three extending arms only, two of said arms being
in engagement with said bead seat ring at a pair of spaced
points only on said bead seat ring, and said remaining
arm extending into said channel in engagement with said
base at one point only on said base so that forces are 15
applied at said locking ring at the corresponding en
gaged points on said arms, said last mentioned points
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,884,984
Riggs _______________ _._ May 5, 1959
728,711
1,067,000
Germany _____________ __ Dec. 2, 1942
France ______________ __ Jan. 27, 1954
FOREIGN PATENTS
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