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Патент USA US3082052

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March 19, 1963
Filed March 29, 1961
2 Sheets-Sham'I 1
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Oser/R P.' L/EBRE/CH
March 19, 1963
Filed March 29. 1961
2 Sheets-Sheet 2
United States> Patent C ice
Patented Mar. 19, 1963k
FIG. 5 is a fragmentary side view of the same.
FIG. 6 is an end view of the hub shell with one of-
Oscar P. Llebreich, Waterbury, Conn., assignor to The
Mattatuck Manufacturing
Company, Waterbury,
Conn., a .corporation of Connecticut
Filed Mar. 29, 1961, Ser. No. 99,223
2 Claims. .(Cl. 301-105)
the spoke flanges in assembled position, showing in dotted
lines the staggered location of the spoke holes of the
flange at the `opposite end of said hub shell, and also show
ing the drive -lugs in the spline recesses.
FIG. 7 is a side view of the assembled hub shell show
ing the pair of spoke flanges at the opposite ends thereof,
and illustrating the angular offset relationship between
This invention relates to clutch retarding mechanisms
and more particularly to an improved multiple disk safety 10 the outer slots in the hub shell which serve to maintain
the proper staggered positions of the spoke holes of the
coaster brake for bicycles and other mechanisms.
_ One object of the present invention is to provide an
improvement on a back pedaling coaster brake compris
respective spoke lianges, and showing the location of the
ing a three-part construction including a polished hard
In order to effectively lock Ithe pair of spoke ñanges
diametrically opposite slots and recesses in said hub shell.
ened hollow hub shell and a pair of» power press as 15 upon the hub shell of the coaster _brake herein disclosed,
the diameter of the central aperture of said flanges will
sembled spoke flanges having a force -iit upon hardened
be made a few thous-andths of ian inch smaller than the
spline rims on said hub shell, said llanges being provided
diameter of the knurled case-hardened spline rims lo
with interior drive ‘lugs ~tit-ting corresponding recesses in
cated at the ends of the hub shell. By means of this con
said spline rims to insure precision staggering of the spoke
holes in the opposed spoke flanges and to assist in driving 20 struction, the soft metal or other material of the flanges
will be swaged, causing them to have an extremely tight
the entire -wheel rim and tire by said hub shell.
vfit upon the spline rim sections. ~
A further object is to provide a coaster brake hub
By the use of the arcuaterecesses on the hub shell the
shell of the above-nature in which curved relief grooves
assembly of each spoke flange is assured of being ac
are provided at ‘the inside of each of the spline rims, into
which the inner end of the softer material of the swaged 25 curately concentric ‘with said hub shell, and it lwill be
seen that the >offset driving lugs on the inside Pof said
spoke ñanges |will llow to produce a positive mechanical
spoke lflanges will hold the spoke holes in proper s‘tag
gered relationship at the opposite ends of the hub shell.
In previous safety coaster brakes it was customary to
Atlanges securely in place.
A» still further object of this invention is the provision 30 attach the spoke flanges to the hub shell by welding,
copper brazing or other methods involving the use of
of the hub shell of a pai-r of tapered pilot necks which
heat, which were unsatisfactory owing to the danger of
assist the operator in guiding the drive lugs of the spoke
warping of the spoke flanges and the formation of scale,
4flanges by “touch” into alignment with the opposed arcu
making it diñicult to ñt said ilanges upon said hub shell.
ate recesses on the exterior circumference of the hub
By means of the present invention, the spoke lianges
shell spline rims.
lock, thus augmenting the swaged press lit of said flanges
upon the splined -rims and assisting in holding said- spoke
A further object is to provide a coaster brake hub
shell in which the spoke llanges are located radially at
are fastened to the hub shell by a “cold” method, which
is far superior to the “hot” methods, as it eliminates the
right angles to said hub shell so as to increase the “hoop
strength” of «said flanges and prevent said flanges from
l The general structure of coaster brake herein illus
above mentioned disadvantages.
spreading outwardly when they are fastened upon the „
trated is Well known and is fully disclosed in the ex‘
splinedsections `of the hub shell.
pired prior patent to Murden, No. 2,049,972 for Retarder,
- y
A -further Objectis -toy provide a coaster brake of the
dated August 4, `1936i.
ì `
Referring now to'the drawings in which like reference
above nature which will be relatively simple in construc
tion, inexpensive- to manufacture, which will not loosen 45 numerals denote corresponding parts throughout the sev
`eral views, the numeral 10` indicates a horizontal sta
in service, which will be easy t-o install and manipulate,
tionary axle yof a bicycle or other machine upon which
compact, ornamental Vin appearance, and very efñcient and
4.the coaster brake is to be mounted. The axle 10 is pro
durable in use.
vided with opposite threaded end sections 11 andl 12,
1 With these _and other objects in view, there has been
illustrated on, the accompanying drawings, one form in 50 lwhich have reduced Unthreaded tips 13:` and 14. The
usual nuts 15, 16, 19, 19a are mounted upon thethreaded
which the invention may conveniently be embodied in
sections 111, 12 of the axle 10, and the usual washers 17,
18, are also located on said threaded sections 11, 12. The
In the drawings:
numeral 20 indicates Ithe usual brake arm, and the num
FIG. l represents a side view, partly in section, of a
multiple disc safety coaster brake mechanism embodying 55 eral 21 shows a sprocket lwheel by means of which a hub
shell 30 is driven forwardly by means of a sprocket
the present invention.
chain, (not shown), and which also actuates the brake
FIG. 2 is a fragmentary longitudinal section on an
elements of the coaster brake, when reversed. The nu
enlarged scale, taken on the line 2-2 of FIG. 6, showing
meral 22 indicates a disc carrying brake anchor mem
in dotted lines the position of `one of Vthe spoke llanges
prior to its assembly on the splined section of the hub, 60 ber, and the numeral 23 designates -a driver member of
and showing in full lines the íinal position of said spoke
standard construction.
The numerals 24, 25, 26 indicate three sets of ball
bearings of the construction usually employed in coaster
FIG. 3 is a fragmentary longitudinal sectional view
brakes `of this general nature. rlihe numeral 27 indicates
showing the relative positions of one of .the spoke holes 65 a cone which serves to simultaneously ladjust all three of
the ball bearings 2‘4, 25, 26. The numeral 28 indicates
and a driving lug.
an open spring wire snap ring for locking the sprocket
FIG. 4 is an end view of the coaster brake hub shell,
wheel 21 in operating position, as clearly shown in FIG. l.
showing `one of the pair of exterior spline rims with its
similar t-o FIG. 2, taken on the line 3---3` of FIG. 6,
Provision is also made of a rotatable and longitudi
two `opposed outer recesses in the circumference thereof,
for receiving the lugs of the spoke flanges, and also show
ing the three keyway slots in the interior of said hub shell
for receiving the lugs of the brake discs.
nally slidable threaded connector 29 having a conical
end for engaging a socket in the hub shell 30 for driving
same. The connector 29 has steep pitch interior threads
(not shown) for engaging similar exterior threads on the
driver member 23.
The usual brake actuator (not shown) is slidably but
non-rotatably mounted upon the anchor member 22 and
has end teeth adapted to intermesh with corresponding
It will be understood that the arcuate recesses 44, 45
of the tapered pilot necks I40 outside of said spline rims
42, 43 serve to permit the two drive lugs 44a, 45a on the
inside of the spoke flanges 47, 48 to be brought by
“touch” into alignment with said recesses 44, 45, prior
teeth upon the end of the connector 29, so that when back
pedaling, said connector 29 will be forced to the left and
will cause said actuator to squeeze together the two sets
to the forcing of the flanges thereon by power swaging,
thus facilitating the manual or “automated” assembly.
While there has been disclosed in this specification one
of alternating brake discs 34 and 36, with the result that
form in which the invention may be embodied, it is to be
the hub shell 30 is retarded
10 understood that this form is shown for the purpose of
Each of the braking `disks 34 has three radial lugs 35
illustration only, and that the invention is not limited to
which are adapted to be located in the three longitudinal
the specific disclosure, but may be modified and embodied
grooves or keyways 31, 32, 33 (FIG. 4). The inter
mediate brake discs 36 are keyed to the anchor member
22 in the usual manner.
At the end of the hub shell 30, provision
made of
in various other equivalent forms without departing from
its spirit. In short, the invention includes all the modifi
15 cations and embodiments coming within the scope of the
following claims.
a pair of usual dust excluding caps 37, 38 and an end
Having thus fully described the invention, what is
plate 39 to protect the ball bearing 26, as clearly shoiwn
in FIG. 1.
claimed as new and for which it is desired to secure
Letters Patent is:
1. In a cylindrical hub shell for a safety coaster brake
conical tapered pilot necks 40, 41 having cylindrical ends
of the class described, said shell having shoulders adja
40a, 40‘b, in which are clearance slots 41a. Provision is
cent each end thereof, and also having an annular groove
also made of a pair of arcuate lugs 44a and 45a (FIG. 6)
located outside each shoulder and extending into said
on the inside of a pair of spoke flanges 47, 48. The
hub shell, a pair of annular hardened serrated spline rims
spoke flanges 47, 48 are inwardly offset slightly, near 25 rigidly mounted on said hub shell beyond and adjacent
their outer edges so as not to interfere with the lay or
said grooves, and a pair of radial circular apertured spoke
alignment of the spokes.
flanges extending at right angles to the axis of said shell
Provision is also made of a pair of case hardened
mounted on said spline rims by swaging, the inner por
knurled or serrated integral spline rims `42, 43 near the
tions of said spoke flanges having interior ribs of mate
ends of the hub shell 30. The spline rims 42, 43 are 30 yrial which flowed automatically by physical contraction
provided with a pair of cut-out arcuate recesses 44, 45
into said grooves after Ithe inner portions of said spoke
for receiving the arcuate lugs 44a, 45a, of the spoke
flanges have passed over said spline rims during the
The ends of the hub shell 30 are also provided with 20
flanges 47, 48.
At the inner sides of the spline rims 42, 43, the hub
longitudinal inward movement of said spoke flanges
|when they are pushed tightly against said shoulders.
shell 30 is provided with a pair of inner annular relief 35
2. The invention as defined in claim l, in which said
grooves 46 into which the stressed and strained “cold
spline rims are provided with a pair of opposed arcuate
worked” material of the spoke flanges 47, 48 is adapted
inwardly extending recesses, and said spoke flanges have
to flow inwardly around the ends of said spline rims 42,
a pair of corresponding opposed arcuate outstanding lugs
43` after said spoke flanges have been assembled in posi
adapted Ito ñt within said recesses for holding the aper
tion over said spline rims by power press swaging, thus
tures of said spoke flanges in their proper staggered angu
forming interior locking ribs 46a.
lar relationship.
The spoke flanges 47, 48 are provided with the usual
spoke receiving holes 49, 50, the holes 49 of one flange
being staggered with »respect to the holes 50 of Ithe op
References Cited in the file of this patent
posite spoke flange. The numerals 51, 52 indicate hub
shoulders against which the spoke flanges are caused to
abut during the assembly operation.
In the operation of this invention, during the power 50
press assembly of the spoke flanges 47, 48 over the hard
ened spline rims 42, 43, the cold worked material of said
flanges will yield inwardly and ilolw into the relief grooves
46 adjacent the shoulders inside said spline rims to form
positive interior locking ribs 46a
McGrath _____________ __ Oct. 14,
Hasselquist ___________ __ July 25,
Murden ______________ __ Aug. 4,
Kurzia ______________ __ Aug. 27,
English ______________ __ Aug. 29,
Great Britain __________ __ Oct. 10, 1929
Great Britain __________ __ Nov. 5, 1931
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