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Патент USA US3074473

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Jan. 22, 1963
Filed March 13, 1961
i 3,074,463
Patented dan. 22, 1953
vides a dat annular seating face 13 for the base of the
3 {i715} #§63
navrcn non srnhrdn'r’nrtmo errants
Eames F. Leighter, Independence, Mo.
(1423 Kansas Ave., Kansas City, Mo.)
Filed Mar. 13, 1961, Ser. No. 95,185
2 Ciainrs. (Cl. 153-32)
This invention relates to a device for straightening the
grankshafts of engines and the like when they become
engine and to accommodate openings 14 for securing the
engine base thereto by suitable fastening devices such as
bolts 15.
Fixed to the flanged side of the web 6 and extending
transversely across the opening is a bracket '16 having
spaced apart side plates 17 and 18. The side plates are
of like construction, and each comprises a midportion 19
and laterally diverging arm portions 20 and 21 that ex
10 tend across the opening on opposite sides of the center
thereof. The arm portions Ztl and 21 are rigidly attached
to the face of the web, as, for example, by Welds 22.
The midportions of the arms 2%? and 21 are parallel and
bly on the ibase of the mower and has a depending crank
are interconnected at the diverging points of thearms
shaft on which the blade is directly mounted, conse
quently the crankshaft is often bent when the blade strikes 15 by blocks 23 and 2d to accommodate the bent end of
For example, rotary lawnmowers are usually driven by
a small engine which is mounted as a complete assem
an immovable object.
Ordinarily this requires Clis
mantling of the engine to remove the crankshaft so that
it can be straightened. lt is obvious that much time
and labor can be saved by straightening the crankshaft
the crankshaft freely therebetween. The midportîons of
the arms, as well as the blocks 23 and 2d, are preferably
of a width corresponding to the projection of the crank
shaft, as shown in FIG. 2.
The upper block 23» has an internally threaded open
while mounted in the engine, since the bend usually occurs 20
ing Z5 near the outer edge thereof, while the lower block
on the outboard end of the shaft, but this usually results
24» has an internally threaded opening 27 near the rear
in damage to the engine because all of the force required
or opposite edge thereof. The openings are also located
to straighten the shaft is also applied to the outboard
in a vertical plane extending through the axis of the
bearing and case of the engine.
The present invention is to provide a device for straight 25 crankshaft, that is, the opening 26 is located directly over
the shaft near the outer end thereof and the opening 27
ening bent crankshafts of engines without dismantling
is below the shaft near the outboard bearing portion of
the engine and without damaging the bearing and engine
the engine casing. Threaded into the openings 26 and
27 are the threaded Shanks 28 and 2@ of jack screws 30
@ther objects of the invention are to indicate the amount
that the crankshaft is bent, the sides of the shaft to 30 and 31, each having head portions 32 and 33 adapted t0
be engaged by a wrench or the like for turning the shanks
which the straightening and resisting forces are to be
of the jack screws into and out of the openings. The
applied, and to indicate when the shaft is in true align
jack screws are thus located in spaced apart relation and
in the true vertical axial plane of the crankshaft 9.
In carrying out the invention, the engine is removed
in order to protect the crankshaft from being marred
from the mower as a complete unit, and the base thereof` 35
by the jack screws, the shaft is protected by a sleeve-like
is bolted to the straightening device, so that the bent end
adapter 3d having an open end 3S of a diameter to accom
of the shaft projects through a bracket of the device, for
modate the shaft and a closed opposite end 36, to mount
contact by a pair of opposing jack screws, one of which
an abutment screw 3’7. The closed end is provided with
is operated to support the shaft against the bending force
of the other, thereby relieving the straightening force 40 an internally threaded opening 33 for accommodating the
externally threaded shank 39 of the screw 37. The screw
rom the engine.
37 has a head dit adapted to be engaged by a suitable
In accomplishing the above objects of the invention, I
wrench, not shown. The adapter has a bore 41 extending
have provided improved structure, the preferred form
inwardly of the open end of a diameter to closely engage
of which is illustrated in the accompanying drawings,
45 the end of the crankshaft when the adapter is appiied to
the projecting end of the shaft.
- iG. l is a face view of a crankshaft straightening de
The device also is provided with a pointer 42, pivotally
vice constructed in accordance with the present invention
mounted on the lower block 24 by means of a screw 43.
and showing an engine supported thereby and with the
The pointer includes an angularly extending arm portion
crankshaft in position to be straightened.
HG. 2 is a side elevational view, partially in section, 50 »te having one end terminating in a point 4S to move over
a scale 45 that is attached to the web portion yof the up~
to better illustrate the adapter sleeve and jack screws for
right, as indicated in FIGS. l and 2. rfhe opposite end
respectively supporting and straightening the shaft.
of the pointer terminates in an angularly extending feeler
FIG. 3 is a fragmentary perspective view showing the
d'7 adapted to engage the periphery of the adapter sleeve,
shaft straightening elements of the device.
FÍG. 4 is a perspective view of an adapter sleeve, part of 55 as shown in FIG. l, to indicate the amount of bend in
the crankshaft and to locate the bend in the plane of the
the sleeve being broken away to better illustrate the screw
jack screws. The scale de has a zero marking 48 at
for eñecting removal thereof when the shaft is in straight
which the pointer represents the straight position of the
shaft, and graduations 49 and Si? extending above and
Referring more in detail to the drawings:
1 designates a shaft straightening device constructed in 60 below the zero mark dä, respectively, to indicate not only
the amount of the bend, but the deflection to be imparted
accordance with the present invention, and which includes
a horizontal base 2 adapted for attachment to a work
bench or the like, not shown. One end of the base 2
has an upstanding transverse flange 3 for attaching an
in the shaft that is necessary to bring the shaft into a per
manently set straightened condition.
In using the device constructed and assembled as de
upright d by fastening devices such as bolts 5. The up 65 scribed for straightening the bent crankshaft `of a lawn
mower engine, the blade is removed from the crankshaft
right d is of generally channel shape and has a web por
and the engine in its entirety is removed from the mower.
tion 6 of a width and height to accommodate the base
An adapter sleeve 35i is applied to the end of the crank
flange 7 of an engine S having a bent crankshaft 9. The
shaft to avoid damage to the crank shaft during straight
flanges 16 and 12. of the upright 4 preferably extend out»
wardly from the base 2 to provide the desired rigidity of 70 ening thereof as later described. The engine is then se
cured to the seating face i3 of the upright support by
the web 6. The web e has an opening 12 therein of
means of the bolts 15, so that the bent end 9 of the crank
large diameter, so that the opposite face of the web pro
shaft, with the adapter sleeve thereon, extends through the
opening 12 and through the opening between the upper
and lower blocks 23 and 24 of the bracket 16, as shown in
FiGS. 1 and 2. In this position, the feeler ¿E47 is in en
gagement with the periphery of the adapter sleeve on the
crankshaft. The crankshaft is then turned until the
pointer 45' reaches its lowest position from the zero niark
ing 48. At this point, the bend in the shaft is in plane
with the Shanks of the jack screws 3@ and 31. rI'he jack
screw 31 is then turned in the threaded opening 27 by
engaging a suitable wrench with the head 33 thereof, to
bring the end of the jack screw into Contact with the bear
ing sleeve, to form a support for the crankshaft in oppo
sition to the jack screw 3i). In this wa‘ , the force of the
force from the bearing portion of the crankcase. it is
also obvious that I have provided-a crankshaft straight
ening device which is of simple construction and which
rnay be sold at a iow cost to the sinall engine and Vmower
repair shops.
. While I have particularly illustrated and described the
invention for use in straightening the crankshafts of small
engines used as the power for lawninowers, it is obviousV
that the device is adaptable to straightening the crank
shaft of any small engine, regardless of the use thereof.
’zi/'hat l clairs and desire to secure by Letters Patent is;
1. A device for straightening the end of a crankshaft
that projects from the case of a small engine or the like,
including a base, an upright on the Abase having any annular
jack screw 3@ is removed Afrom the crankcase and bearing 15 se . on one side for seating the case of the engine and
‘ ing
opening therethrough for projection of the bent
of the engine.
With the shaft suitably backed by the jack screw 31,
end of the shaft, means for securing the case of the engine
to said seat, spaced apart plates having parallel midpor
the jack screw 3i) is turned into the opening 26 by apply
tions and diverging arrn portions spanning the opening in
ing a wrench to the head 32 thereof. The jack screw is
said upright and engaging the side of the yupright opposite
rotated to force theV crankshaft into straight condition.
to said seat, rneans for rigidly securing the ends of theV
During this manipulation of the jack screw 3€), the de
ñection of the crank shaft is indicated by the point ‘i5
arrns to the upright, upper and lower transverse blocks
of the pointer 42, since the adapter sleeve bears upon
connecting said midportions of the plates in spaced apart
relation to provide for projection of the engine shaft
the feeler arm 47 of the pointer. Usually the jack screw
Sil needs to urge the shaft beyond its straight position as 25 therebetween, a backing screw carried by the lower lblock
near the projection of the shaft from the case for backing
indicated by the pointer in registry with the zero marking
said shaft, and a jack screw carried by the upper block
43 of the scale, so that when the pressure is released they
for engaging the opposite side of the bent end of the shaft
v shaft returns to straight condition and remains in straight
near the end thereof for straightening said bent end of
The shaft is then checked through a full 360° rotation 30 the shaft over against saidbacking screw.
2. A device for straightening the bent end of a crank
upon slacking oiî both of the jack screws. If the point
shaft that projects from the case of a small engine or the
¿5 of the pointer remains on zero position throughout
like, as described in claim 1, and which includes a lever
the full rotation of the crankshaft, the bent end of the
pivoted on the lower of said yblocks and having a feeler
crankshaft has been restored to straight condition. How
portion on said pivoted end for engaging said end of the
ever, if there is any deviation from the zero position, the
' shaft and having a pointer on the other end, and a scale
jack screws are again manipulated until there is no devia
ñxed to the uprightY for indicating the position of the
tion of the point 'i5 from the zero position.
When the shaft is in straight condition, the engine is
removed from the straightening device by disconnecting
the bolts 15. The screw 37 is then rotated against the end 40
of the shaft to loosen the adapter for ready removal from
the shaft. The engine is remounted on the mower and
the cutter blade is reattached to the depending end of
the crankshaft.
From the foregoing` it is obvious that I have provided 45
a crankshaft straightening device which supports the shaft
during bending thereof, so as to relieve the straightening
References Cited in the ñle of this patent
Williams _____________ __ Feb. 22,
Simmons ____________ __ Oct. 28,
Weaver ______________ __ Nov. 2,
Pope ___ _____________ __ Feb. 2,
Dirks _______________ __ Apr. 10,
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