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Oct. 29, 1946. .
Filed Feb. 1. 1945
Patented Oct. 29, l946
rence B. Schaiier,’ Los Angele's'jcalifg assignors
Q I to Bucyrus-Erie Company," South ‘Milwaukee,
' 'Wis., a corporation of Delaware"
’ Application February 1, 1945',"SerialNo. 575,660
5 Claims. (01. 1380-791)
and useful details, which will be ‘readily evident
Our invention relates to new .and useful im
provements invariable tread vehicles, more par
ticularly such vehicles for the purpose. of carrying
trench excavators of the Ruth ty'pe, so-called',
suchfor exampleas shown and described in U. S.
, as‘ the description‘ progresses, _.
Our invention consists. in the novel parts and
in the combination and arrangement thereof,
whicharede?ned in the appended claims, and of
which one ‘embodiment is exempli?ed in the ac
com'pa'nying] drawing, which. is hereinafter par
PatentNo. 1,877,556, issued September 13, 1932,
to Ary C. Clark et al., for improvements in Canal
' ticularly- described and explained.
, .Such machines consist .of- a main frame, usu
f Throughout the description, thesame reference
ally with creeping traction mounting, and carry
ing the engine and excavating machinery; and
10 number is applied to the same member orv to
an auxiliary frame, also usually mounted on
creeping traction, and located on the outer end
of an extensible outrigger, usually telescoping.
Figure 1 is a front elevation of a trench excava
tor embodying our invention. For simpli?cation,
all machinery, other than that involved- in our
I The object‘of thisextensibility' of the outrigger 15
invention, has been eliminated.
is'solfthat the distanc'ebetween the two creeping
I Figurez isa plan view of the same.
similar members.v
' '
_ 4;
Figure 3 is the same as Figure 2, exceptthat in
tractions can be adjusted so as to span the lch'an
Figure?bur outrigger unit has been turned. ,
‘ Referring now to all these ?gures, we see that
, ‘In.which
the improved
is being dugfor
models cleaned.
of, such a machine,
~ '
‘ ‘ ' the
outrigger'traction mechanism, as well as the main 20 It is the main-framevof a trench excavator, sup-'
ported on .creeping.traction__mechanism l2, driven
traction mechanism, is self-propelled- With such
in any convenient manner by a main engine (not
a machine, the easiest way to run the outrigger
in and out, is by turning the outrigger unit at an
Across the ditch l3 from the main frame ll,
angle, so'thatit will run' in or out under its own
power as the machine progresses along the ditch. 25 there is an outrigger frame l4, connected to the
mainframe‘ H’ by a?telescoping', beam l5, which.
Such ,is ‘the case with. the machine shown and
may be of'any‘co'nvenient construction inasmuch
described in 'the'plark. patent, above referred to,
asthe details thereof constitute no part of our
and with the. machine shown and described in
11.5. Re‘. Patent No. 21,106, issued May 30, 1939,
V to ‘Lawrence 'B. Schau'er (one of the present‘pat; 30 ' The’ outrigger frame I4' is‘ connected to the
telescopingI beam [5, by a single pivot-pin [6",
which must'vbe de?nitely to one side of the center
ente'es) , for improvements in variable tread vehi
line of the creeping traction mechanism I'I- which
, However, in the device of each ofthe abovee
supports the outrigger frame. ' The‘ main‘engine,
mentioned twopatentsthe turning of ‘the out
rigger has to‘b‘e accomplished by hand by rotat
ingqa handewheel or crank. Furthermore this
hand steering has been» found to be at the, best
referred'?toearlier herein, isiequipped with ‘ap4
propriate‘ clutchesand brakes and vother mech'-‘
anism‘ (notshown'), to control the relative speed
i of the twovtract'ion mechanisms t2, and‘ l'l.v
very laborious, and. at‘ the worst practically im
possible, depending on the ‘condition of the ground
f On‘ the" deck of‘ outriggerframe' M, on the side
on. which the outriggeruinit is resting. , In some '40 opposite’from' pivot l6‘, there‘are ‘a series of holes
l8, arranged in“ a'cir'cular ‘are about pivot l6 _'as
instances, the steering can be effected only by
having one man walk’ alongside manipulating the
V a center; Beam 'l5extends through‘ outrigger
steering wheel or handle, while another man‘ruiis. L
themachine'; but this expedient is manifestly im
possible with one-man operation. ‘
‘Of course, the turning could be eifected by
power, but this would .requirethe additional eX-.
pense’. of much. additional machinery. vInfact,
is a second series of registering holes 20.
pivoting attachment of outrigger frame I4 to
ing't'he. outrigger creeping‘ traction unit without
statediwefhave 'worke‘dio‘uti a number of novel
' ,creeping traction mechanism l1 pivotally'sup;
the‘ vuse of either‘ a hand-power steer or'a power
In addition, to our, principal object, above
nfe‘ed’h'oles' l8, ‘l9'and 2|] be on the opposite side,
provided only‘ that holes I8, 19 and 20 are sui?}
ciently' spaced from pivot I-G‘to assure a ?rm non-}
‘Accordingly the principal object of our inven
tion is to provide an inexpensive means for steer
, Pivot It need not necessarily be on either side
‘ of outrigger frame I'4','rath'er than the other, nor
evenfthe hand-power turning apparatus involves
some additional expense. '
frame lta'n'd has a‘hole' Is the same radial dis-5‘
taiice-from pivot vl6 ‘as are‘holes l8. Below each
of'lioles ‘18" and below the level of hole I9, there"
ports-outrigger frame [4- through "a combined
driveeshaft and pivot 21'. This-"shaftis' driven
sprocket'22, which in-turn is driven by sprockl'ja
'et-chain 23, which in turn is driven by sprocket
24, which in turn is driven by shaft 25, which
in turn is driven by universal coupling 26, which
in turn is driven by shaft 21.
Shaft 25 is ‘supported by outrigger frame l4 in
to the pivot as a center, whereby the outrigger
frame may be locked in various selective angular
relations with respect to the beam, to permit the
outrigger frame to be steered by unlocking the
any convenient manner.
then locking the outrigger frame in its new angu
outrigger frame, then driving the main frame, and
As shown, it is sup
ported by bearing-bracket 28.
Shaft 21 is supported by telescoping beam [5
. lar position, the outrigger frame thus locked in
new angular. position serving to'expand or con
tract the telescoping beam as the vehicle pro
in any convenient manner. As shown, it is sup
ported by bearing-bracket 29.
ing means for the main traction is located on the
main frame, and has a driving connection with
shaft 21 be substantially in the same vertical
plane as telescoping beam l5, although not neces
sarily above it.
For that matter, the whole mechanism for con
veying power from the main frame tothe out
rigger frame could beelirninated, and some other
and more direct means of driving creeping trac
tion I‘! could be'employed, for example as shown
infthejClark patent cited earlier herein, or it need
not be driven at all, although preferably it should.
2. A variable tread vehicle, according to claim 1,
further characterized by the fact that the driv
Unless some alternative expedient be employed,
it is essential that universal coupling 26 bealmost
exactly vertically aligned with pivot 16, and that
15 the outrigger traction, which driving connection
comprises: a telescoping drive shaft in substan
tially the same vertical plane as the beam; a drive
shaft on the outrigger frame; and a universal
coupling between the two shafts, which coupling is
located in substantial vertical alignment with the
vertical pivot.
3. _A variable tread vehicle, according to claim
1, further characterized by the fact that the selec
Other forms, of traction than creeping could like
tive locking means are arranged in a circular arc
wise be employed. In the claims, when we refer 25 about the vertical pivot as a center.
4. A variable tread vehicle, according to claim 1,
further characterized by the fact that the selec
to “traction support” we mean a mechanism hav
ing ground-engaging load-supporting ground
tive locking means comprise a substantially verti
traversing potentialities, but not, necessarily im
plying capability for tractive effort, unless this is
cal hole in the beam, and a series of substantially
speci?cally'called for by any given claim.
30 vertical holes in the outrigger frame, all arranged
in, a circular are about the vertical pivot as a
" Ourmethod of driving shaft 2‘! is as follows,
although any other telescoping means could be
center, and a pin for passing through the former
employed. Gear 30‘is journaled in bracket 3|.
hole and one of the latter holes when in register.
The right hand end' of shaft 21 is squared or
5. In a machine of the class described: a freely
otherwise keyed'to ?t slidably in the hub of gear 35 laterally extensible frame; means for supporting
and propelling one ‘ side of the frame; similar
30. Gear 30 is then driven, in any convenient
manner, by the main engine (not shown).
means at the opposite lateral side of the frame;
‘ ‘Normally outrigger frame‘ [4 is locked (by pin ' the latter means being shiftable laterally with the
laterally extensible portion of the frame, and
32, passing through hole E9, the, central one of
holes l8, and the corresponding one‘ of holes 20, 40 shiftable about a vertical axis angularly with re
as, in Figures 1 and 2) against pivoting with re
spect to beam l5.
spect' to‘ the longitudinal axis of the frame and
the ?rst propelling means; said frame being capae
' beam,‘ l5,‘ he removes pin l9. Avery slight for
ward or backward propulsion of the machine will
ble of being extended and contracted when said
frame‘ is propelled while the latter means is posi
tioned, angularly with respect to the frame; said
swing the outrigger frame (as, for example, shown
vertical axisbeing offset from the center line
When .the operator desires to extend or contract
in Figure 3), due to the oifset locationof pivot , ,
I6. Pin‘ .32 can then be reinserted, thus locking
the outrigger frame in its swung position.
Further propulsion of the machine in the ap:
propriate direction will then extend or contract
beami l5, whereupon outriggerframe H can be 7
restored to parallelism withmain frame H, by
a repetition of the maneuver ?rst described.‘
If desired, means'may be provided for locking
beam l5 against further extension or contraction;
but such means are not shown, as they‘do not
constitute a part of our'invention.
, f ,
’ ‘Having now described and illustrated one ‘form
of the second supporting means; and'means for
' l’ockingthe second supporting means, in angular
relation to the extensible frame; whereby the
second supporting means may be steered by un
locking it, then driving the first supportingrmeans,
and" then looking the second supporting means in
its new'agnular position, the second supporting
means’ thus locked in new angular position serv
ing to expand'or contract the laterally extensible
portion as the vehicle progresses.
, 6.‘ ‘In a variable tread vehicle, having a main
frame and‘ an outboard’traction,support, and a
laterally ‘adjustable, connecting means between
of 'our invention, we wishit to be understood that 60 the main frame and the outboard support; means
our invention is not .to be limited to the speci?c
providing a vertical axis offset from the center
form or arrangement of parts herein described ; , line of the outboard support, about which said
outboard support can be angularly adjusted with
and shown.
respect to'the connecting means; and means for
We claim:
1. In a variable tread vehicle, the combination 65 selectively locking said outboard support in a plu
rality of angularly adjusted positions; whereby
of: a main frame; a traction support therefor; an
the outboard support may be steered by unlock
outrigger frame; a traction support therefor;
ing it, then driving the outboard support, and
means for driving the main traction; a telescop
then looking the outboard support in its new an
ing beam connecting the two frames, the beam’s
means of connection to the outrigger frame com 70 gular position, the outboard support thus serv
ing to expand or contract the laterally adjustable
connecting means as the vehicle progresses.‘
the center-line of the traction support of the out
rigger frame; and a series of selective locking
means spaced radially from the vertical pivot and
spaced from each other angularly with respect 75
prising: a substantially vertical pivot offset from
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