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Патент USA US2131532

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SéPt- 27» 1938~-
Filed April 16, 1937
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Patented Sept.'y 27, 1938
'Frank T. christian,'E|mn-a, N. Y., assigner to
Eclipse Machine Company, Elmira, >N. Y., a c_or
poration of New York
Application April 16, 1937, Serial No. 137,316
3 Claims.
(ci. 18a-25o) ~
The present invention relates to vehicle brakes
lugs lIii and I4 on the clutch operating members
and more particularly to coaster brakes for bl
cycles, velocipedes and the like.
In that type of coaster brake which incorpo
5 rates an expansible -cylindrical brake member
such as used in the device k'nown commercially as
the “Morrow” brake,- constructed substantially in
accordance with the disclosure in the patent to
Morrow No. 906,149, patented December 8, 1908,
3 and 6 respectively.
According to the present invention, the slots 6, _
and 9 ~terminate in triangular openings I5 and I6,
the bases I1 and I6 of which triangles are ar- 5
ranged circumferentially'of the cylinder whereby
strips or bands 'I9 and 2| of substantially uniform
cross section are formed joiningv the segments
into which the cylinder is divided by the slots 6
and 9.
The bases I1, I8 of the triangular open- 10 I
10 a certain amount of difficulty has been encoun- - ings are merged smoothly into the sides thereof
tered in connection with fracturing of the brake
cylinder Adue to the cumulative effect of repeated
by means of curved fillets 22, 23, 24 and 25, and
the surfaces of thebases and fillets are smoothed '
expansion and contraction thereof. Extended and polished and their edges rounded to ensure '
investigation of this phenomenon has indicated 4that there are no sharp edges, scratches or pits 15
15 that such failures are .due to a fatigue of the ' which might form the starting point of a crack
metal at points of localized stress, in conjunction
or line of failure.
e ^
with the existence of minute superficial imperfec
A hub member 26 having an interior cylindrical
tions or scratches on the hardened surfaces of the
It is, an object of the present invention to pro
vide a novel expansible brake member which is
efficient and reliable in operation over long
periods of use.
It is- another object to provide such a device
25 which is so formed as to prevent localization of
surface of slightly greater diameter than the nor- A
mal diameter of the brake member 1 is journalled 20
at one end on the anchor member 2 as indicated
at'21, and at its other end on the driving member
4 as» indicated at ’29. A driving connection be
tween the driving member 4 and hub 26 is pro
vided- in the form of segmental clutch members 25
29 adapted to be. wedged into engagement withf'
the interiorA of the hub by means of the adjacent
tapered portions of lugs I4 on the nut >6.
In the operation of the brake, backward rota
It is a further object to provide such a deviîze
which is so constructed as to avoid superficial
formations conducive to the start of fractures or tion of the driving member 4 causes the brake 30 ,
30 lines of failure.
~ actuating nut 6 to move to the left in Fig. l, thus
A Further objects and advantages will be appar
moving the brake assembly to the left until the '
, ent from the following description taken in con
actuating member 3 enters into clutching engage
nection with the accompanying drawing in ` ment with the anchor member 2. Further move
ment of the nut 6 to the left- causes the wedges 35
35 Fig. 1 is a side elevation partly broken away
I3 and. I4 of the members 3 and 6 to enter the
and in section of a >coaster brake incorporating a flared portions II, I2 of .the slots 8, 9-` of._„the
preferred embodiment of the invention; and
brake sleeve, thus expanding the sleeve into fi'ic-v .
Fig. 2 is a detail in perspective of an expansible tional engagement with the interior of the hub.
brake cylinder >constructed ~in`accordance with During this expansive action 'of the brake cylin- 4,0 40 the invention.
Referring ñrst to Fig. 1 of the drawing, there-~
is illustrated a coaster brake of the Morrow type
including a fixed axle shaft l, a brake anchor
member 2 threaded thereon, a brake supporting
45 and actuating member 3 loosely mounted on the
axle and adapted to be moved into clutching en
gagement with the anchor member, a driving
member 4 journalled on the axle as indicated at
5 and having threaded thereon a brake actuating
50 nut 6.
der 1, the iiexure ofthe connections-between
the segments is distributed .substantially uni
-forrnly along the, connecting strips I9, 2l by
reason of their'subst‘antially uniform cross sec
There is thus no localization of stress, and 45
l the bending moments are well within the elastic
limit of the material so that there is no danger
of fatigui'ng lthe metal. The elimination of
sharp corners, edges and all other'features con
ducive to the starting of lines of failure also con- 50
A cylindrical brake member 1 rests at its ‘ tributes to the improved operation of the device.
ends on the brake actuating members 3 and 6 and
is provided with longitudinal slots 8 and 9 ex
lIt has been found by exhaustive tests of this
in comparison with the structure utiliz
tending alternately from opposite `ends of 'the structure
openings at the ends of the slots as
brake cylinder and having"` flared portions II and
‘ ß I2 adapted to be engaged by tapered expanding ‘ taught by the patent to Morrow above cited, that 515A
the utilization of the principles herein disclosed
multiplies the average life of the device about
twenty-five times, all other structural features
tially circumferentially o! the cylinder and being
Joined4 to the sides thereof by smoothly curved
remaining entirely the same. Thus when the ‘ fillets, the surfaces of said bases and fillets being
average life of the earlier type sleeve was found rounded at the edges and polished.
to be around five' thousand applications oi' the
brake. `the average life of the same structure
incorporating the features of the present inven
tion was above one hundred twenty-five thousand
such applications.
2.’ In a' vehicle brake, an expansible cylindrical
brake vmember in the i'orm oi' a sleeve having
longitudinal slots entering at one end and termin
nating adjacent the other end in enlarged open
ings formed to provide circumferentially extend
ing strips of substantially uni/form cross section l0.
joining >the segments of the cylinder.
Although but one i'orm ot- the invention has
been shown and described in detail, it will be
3. In a' vehicle brake, an expansible cylindrical
understood that other embodiments are possible
and that various changes might be made in the brake member in theform of a sleeve having
proportions and. design of the parts without » longitudinal slots entering at one end and termi
departing from the spirit of the invention as nating adjacent the other end in- enlarged open
Vings formed to provide circumferentially extend
defined in the claims appended hereto.
ing'strips oi' substantially uniform cross section
What is claimed is:
>i. In a 'coasten brake, a cylindrical brake Joining the segments of. the cylinder, said strips
20 member having longitudinal slots extending being Joined to said segments by smoothly curved
tlilets, the fillets and adjacent surfaces, of ,the 20
alternately from opposite ends, said slots termi
nating in generally triangular openings, the strips being smoothed and polished.
bases of said triangles being arranged substan
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