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NOV‘ 12, 1946-
A. E. w. JOHNSON ‘ET AL
TRACTOR J ACK
original Filed March 8,_ 1943
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2,410,945
Patented Nov.
2,410,945
1946
UNITED STATES PATENT OFFICE 1
Arnold E. W. Johnson, 'Oak'Park, and John R.
Orelind, Wilmette, Ill.
Original application March 8, 1943, Serial No.
478,462. Divided and this application October
25, 1943, Serial No. 507,550
1 Claim. . (Cl. 97-50)
1
v
i
make any desired movement of this ?nger-tip
control lever 92. An extension 98 of the lever 92
beneath the pivot point engages a link arm I00,
This invention relates to tractor jacks and is a
division _ of‘our copending application having
Serial No. 478,462, ?led March 8, 1943.
An important object of this invention is to
provide a tractor having an implement capable
of dual operation: .(1) that of earth working;
and (2) as a jack in combination with minute
?nger-tip control therefor.
It is also an important object of this inven
tion to provide a jack ‘especially adapted for
tractors or the like and which is actuated by
‘power supplied from the tractor.
An important requirement of a tractor jack is
that it be capable of lifting within accurate predetermined limits.‘ It is necessary, therefore,
which in turn pivotally engages an arm I02 and
pivots it about a point I04 so that a lower end
I06 of- the arm I02 controls a valve actuating _
means including a member I08 associated with
an hydraulically operated device including a
cylinder member H0. The member I08 _is so
10 adjusted that a movement of the ?nger-tip lever
92 causes an opening or closing thereof and
permits greater or less movement of .the piston
(not shown) within the hydraulic cylinder IIO. -_
Movement of the piston causes a direct movement
- of the arm 64. Provision is also made within this
l5v
positively lock the piston
in its ultimately'assumed position, as determined
as a requisite for efficient tractor jack operation
- hydraulic mechanism to
to provide a power lift arm which is movable
through vernier adjustment. ,
> by operation of the member I08 by the ?nger-tip
Other and further important objects of this
invention wiil become apparent from /the dis
lever 92.
closures in the following speci?cation and accom
panying drawing.
The drawing shows side elevation of a tractor
incorporating the tr tor implement jack with
?nger-tip control.
1
As shown in the drawing, reference numeral
I0 indicates generally a tractor of the usual type \
having a chassis I2‘ upon which is mounted a
forward wheel (not shown) and a pair of rear 30
axles I6, one one being shown. The rear axles
I6 are journaled within bearing members I20
~
,
The combining of the ?ng r-tip control with
20
the tractor jack, as disclosed herein, is novel
inasmuch as it produces a long sought-after
device capable of much greater precision as re
quired for tractor jacks in order that they be used
successfully. 'It is now possible to accurately
raise one wheel of the tractor to any predeter
mined height. Such a condition is very desir
able inasmuch as the tractor wheels are so very
heavy it is necessary, when mounting or,dis
mounting them, to‘ have the axle at the exact
height for sliding of the wheel on or oif without
the necessity of lifting it. The calibrated?nger
tip control enables the operator to adjust the axle
at just this proper height. Certainly the devices
tire 26 is mounted on a rim member 24.
that were limited only to full arcuate movement
35
Heretofore, mechanisms have been employed
of the power-lift arm were not adapted to the
and support large wheels 20, which ordinarily
accompany agricultural tractors. A pneumatic
to actuate a power-lift arm 64, but most of these
' operation of tractor jacks, nor were the devices
have been restricted to full movement of the
that were capable of intermediate stopping of
arm between its extreme end positions, and gener-,
the power arm to be successfully utilized with a
ally no provision was made for intermediate stops
40 tractor jack, for the reason that the axle height
of the arm. If intermediate stops of the power
could not be adjusted to any predetermined height
lift arm were available, no accurate means were
without much running back and forth in attempt
ever provided to stop the arm at some predeter
ing to get the power arm in the right position.
mined desired position. An application on “Power
It is to be understood, of course, that speci?c
adjusting mechanism," Serial No. 466,463, sets 45 details of theltype of- power-operated mecha
forth an easily operated ?nger-tip lever which,
nism are not disclosed, because they are not an
upon being moved through its arcuate range,
integral part of this invention, but rather any
causes an equal arcuate-moveinent of the power
device that permits accurate ?nger-tip control.
arm 64. Provision is made in that mechanism
of the power-lift arm will su?ice. For details of
for providing positive locking means of the arm
such a device, see the above mentioned applica
50
64 at whatever point the ?nger-tip lever is
tion having Serial No. 466,463.
stopped. A like ?nger-tip lever 92 is pivoted to
The drawing shows a cultivating implement
‘an uprighton the chassis and is capable of mov
II2 having earth-working tools II4, which are
ing across the arcuate scale 96, which is accurately
adapted to penetrate relatively soft ground and '
calibrated and positioned in close proximity to
so
prepare it for proper crop raising. The im
the operator of the tractor so that he may easily 65
2,410,945 '
N
plement I I2 is directly mounted on the tractor
I0 somewhat similarly to the mounting of the
jack'standard, as shownin Figure 1. A bracket
H6 is attached at II8 to an axle housing I20,
4
ployed intermediate the direct linkage connec
tion between the power-lift arm 64 and the im
plement tools II4, so that, upon‘ actuation of the
arm 64 when the tractor is raised on some ?rm
shown as a square in cross section in contradis
support, the linkage could be reduced in length
tinction to the circular housing I8 shown on the
tractor in Figure 1 of the parent application. A
to prevent injury of the tools. In the construc
tion illustrated in the drawing, such resilient or
pair of lever arms I22 and I24 are pivoted re
'
spectively to the lower and upper portions of the
yieldable member has been entirely removed so
that the tools do not "give," and the result will
be a lifting of the rear end of the tractor.
bracket H5 at I28 and I28. The other ends of
the arms I22 and I24 are pivoted ‘to a bracket
We have developed a practically operable trac
tor jack capable of commercial adaptation for
the sole reason that it is provided in combina
I30 at the points I32 and I34, respectively. The
cultivator H2 is bolted or otherwise attached to
the shaft I36, which forms a unitary part of the
vertical bracket I30. Alink arm I38, connected 15 tion with the ?nger-tip control, permitting opera
tion thereof in minute increments, and we do
to the arm 64 at one end, pivots about a point
not intend limiting the patent granted thereon
‘I40, which point forms an arc described by a
otherwise than as necessitated by the appended
connecting link or radius rod I42 as pivotable
claim.
about its lower end at the point I 28 on the bracket
What is claimed is:
IIB. A link arm I44 interconnects the bracket 20
In a tractor having an elongated body and a
I30 by connection at 'a point I46 with the arms
transverse axle at the rear thereof for carrying
I38 and I42 at their pivot point I40. A sleeve
rear traction wheels, a housing for said trans
I48 is slidably adjustable along the length of the
verse axle, said tractor containing a power source
link arm I44 and has an integral bracket I50,
including a swingable work arm positioned on
which is adapted to receive a pin through ’ an,
aperture therein at the point I40 to thereby join 25 one side of the tractor at a forward point on the
elongated body, a hydraulic device adapted to
the three members I 33, I42, and I44. The depth
that the cultivator is capable of attaining is con
cause swinging movement of said work arm, a
trolled by adjusting the sleeve I 43 ,either higher
or lower on the link arm I44.
As shown in the drawing, the ground level is‘
at I52, and the tractor wheel 20 is raised there
control lever, actuating means associated with
30 said hydraulic device, linkage between said con
trol lever and said actuating means, the tractor
having a jack means at the rear of the tractor
operated by said work arm, the said jack means
from. This condition has arisen, because the
ground IE2 is so hard that the cultivator tools
comprising a cultivating implement, longitudi
II4 cannot penetrate and, inasmuch as there is 35 nally extending and vertically joined parallel
a direct linkage connection between the power
liit arm 64 and the tools I I4, the tractor itself
links connecting said cultivating implement to
said axle housing, a radius rod pivotally attached
then raises. Hence, this cultivator implement
to the upper parallel link at its point of connec
acts in place of a jack when used on ground hard
tion to the axle housing and extending upwardly,
enough to prevent penetration of the cultivator 40 said radius rod and said work arm substantially
tools. Generally. ordinary earth is not packed
parallel one to the other and joined by a rigid
solidly enough to resist penetration of implement ' connecting link, and another rigid link joining
tools, so the tractor is run onto some hard ?oor
said radius rod and the other of said parallel
ing, such as concrete or the like, and the ?nger
links
at the rear end thereof, whereby movement
tip lever 92 moved along its arcuate scale to any
of the control lever to swing the work arm rear
desired point, and the rearlwheels of the tractor
wardly will cause a downward swinging of said
are thereby raised or lowered, as required. It will
parallel links and an upward movement of the
be seen that the implement performs all the
functions of a jack.
_
'
. rear of said tractor.
Heretotore, resilient means have been em 50
ARNOLD 'E. W. JOI?‘ISON;
JOHN R. ORELIND. -
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