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Патент USA US2117124

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May 10, 1938.
Filed July 20, 1957
Patented May 10, 1938
Clarence A. Wheeler, Toronto, Ontario, Canada
Application July 20, 1937, Serial No. 154,663
4 Claims.
This invention relates to crank pin assemblies
for the driving wheels of locomotives and more
particularly to side rod retaining means.
A number of devices have been proposed for
5 preventing the possibility of the side rod from
being forced oif the crank pin by sudden violent
laterally applied forces, such -devices consisting
of a disc-like member secured to the outer end
, of the crank pin. In the known devices of this
10 kind the disc has been rigidly fastened to the
crank pin and has not been entirely satisfactory
in operation.
The object of the present invention is to pro
vide an improved side rod retaining device which
is free from the objectionable features of the
known devices, and with this object in view the
retaining member, according to the. present in
vention, is provided with means for holding it
yieldingly in engagement with the outer end of
the crank pin.
II‘he invention consists in the combination and
arrangement of parts hereinafter describedand
more particularly described in the appended
Referring now to the accompanying drawing
I0 and is compressed between the shoulder 9 and
the head I2, the spring being held in compres
sion by suitable means such as a key I 4 pro
jecting through the slot II and engaging the
member 5. The spring I3 is so constructed that
when at rest the width of each coil is substantial
ly greater than the space between each coil.
In order to avoid a lateral projection of the
member Ill beyond the outer face of the member
5 the central part of the member 5 is preferably
dished as at I5, to provide a recess to receive the
key I4, the crank pin I being formed with a cor
responding recess IE into which the central part
of the member 5 ñts.
It will be seen that the assembling of the de 15
vice is a simple operation. The member II), with
the spring I3 upon it, is inserted through the pas
sage. 'I and aperture B from the inside of the
-wheel 2. The spring I3 is then compressed by
means of any suitable tool (not shown) inserted 20
into the recess B and pressed into engagement
with the head I2, causing the slotted end of
the member I0 to project beyond the outer face
of the member 5. The key I4 is then inserted in
the slot II and the tool removed from the recess
which illustrates by way of example one con
venient embodiment of the invention:
Figure l is a sectional elevation of the im
8, permitting the spring I3 to expand and cause
the projecting ends of the key I4 to be pressed
into engagement with the central part of the
proved device and
`member 5. The member 5 in turn is thus pressed
firmly into engagement with the outer end of the
Figure 2 is an end elevation looking on the left
hand end of Figure 1.
The crank pin which is shown at I is mounted
in the locomotive driving’ wheel, a part of which
is indicated at 2, and the side rod and side rod
35 bushing are indicated in dotted lines at 3 and 4
respectively. The side rod retaining member,
preferably of disc-like form, is shown at 5 and is
provided with a central perforation 6 which is
preferably of a non-circular shape, for example
40` square, as shown in Figure 2. The crank pin I
is formed with an axial passage 'l which regis
ters with the perforation 6 and is preferably of
the same shape in cross section as the perfora
tion. The passage l opens into a recess 8 at the
45 inside of the wheel, a shoulder 9 being formed
surrounding the inner end of the passage 'I.
A tension member Iû projects through the pas
sage 'I and perforation 6, and is provided at its
outer end wtih a slot I I and at its inner end with
50 a head I2. The tension member IIJ is preferably
of such cross section that it will not rotate with
respect to the crank pin I or the retaining mem
ber 5, and may conveniently be made of a sub
stantially square section as shown in Figure 2.
(Cl. 74-595)
A powerful spring I3 surrounds the member
crank pin I, but lis able to yield to a limited
extent when subjected to sufñciently powerful
forces caused by lateral movement of the side rod
3, and to return the side rod promptly to its nor
mal position. As the width of each coil in the
spring I3 is greater than the space between each
coil, the spring will still be partially effective to
hold, the key I 4 pressed against the. member 5 and
the member 5 in engagement with the crank
pin I.
After assembly of the device any suitable
means such as small projections may be welded
in the recess 8, as indicated at I'l, to prevent the
inner end of the member IIl from leaving the re
cess 8 if the member I0 breaks.
It will be understood that the foregoing de
scription and accompanying drawing are given
by way of example only and that modifications
Within the scope of the appended claims may be
resorted to without departing from the invention.
What I claim is:
1. In combination with a driving wheel, a
crank pin having an axial aperture, a centrally
apertured rod-retaining disc of larger diameter
than said crank pin and arranged coaxial there
with, a tension member extending through the
apertures in said crank pin and disc, a key ex
tending through a slot adjacent the outer end of
3. A crank pin assembly as claimed in claim 1,
wherein the inner part of the axial aperture in
said tension member, a head on the inner end of
than the outer portion.
4. A crank pin assembly as claimed in claim 1,
wherein the inner part of the axial aperture in
said tension member, and a spring surrounding
said tension member and compressed between
said head and a shoulder on the crank pin.
2. A crank pin assembly as claimed in claim 1,
wherein the central portion of said disc is de
10 pressed inwardly, the outer end of the crank pin
being recessed to receive said depressed portion,
the crank pin is of larger cross sectional area
the crank pin is of a larger cross sectional area
than the outer portion and wherein projecting
means are provided at the inner end of the aper
ture in the crank pin in the path of withdrawal
of the tension member.
and the outer end of the tension member and the
key being disposed within said depressed por
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