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Патент USA US3072211

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Jan. 8, 1963
c. BRAKHAGE
3,072,201
TRACTOR-MOUNTED FOLDING DRAG HITCH
Filed Jan. 13, 1961
3 Sheets-Sheet~1
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Jan. 8, 1963
c. BRAKHAGE
3,072,201
TRACTOR-MOUNTED FOLDING DRAG HITCH
Filed Jan. 13, 1961
5 Sheets-Sheet 2
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INVENTOR.
C'HARLe-s l .BRAKHAGE
BY
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AT ToRNÉYs
Jan. 8, 1963
c. BRAKHAGE
3,072,201
TRACTOR-MOUNTED FOLDING DRAG HITCH
Filed Jan. 15, 1961
5 Sheets-Sheet 3
INVENTOR.
@HAI-ues
.BRAKHAGE _
,1W
A T Ton/Veys
Unite?V States Patent Office
3,072,201
Patented Jan. 8, 1963
l
2
3,072,201
detailed specification, appended claims and attached
TRACTÜR-MÜUNTED FOLDING DRAG HITCH
Charles lìralrhage, Murdock, Minn.
Filed `lan. 13, 1961, Ser. No. 82,617
11 Claims. (Cl. 172-456)
This invention relates generally to agricultural equip
ment and machinery, and more particularly it relates to
a tractor-mounted folding drag hitch for use in connec
drawings.
`Referring to .the drawings, wherein like reference char
-acters indicate like parts or elements throughout the
several views:
FIG. 1 is a view in rear elevation of my invention as
it is mounted on the rear of a tractor, some parts being
broken away;
FIG. 2 is a view in top plan thereof, some parts being
tion with tractors of the typ-e having transversely disposed 10 broken away and some parts shown in section, and the
power lift rock-shafts.
folded inoperative position thereof `being shown in dotted
Generally, my invention comprises a central frame
section, and a pair of side frame sections pivotally con
lines;
FIG. 3 is an enlarged view in vertical section taken
nected in side-by-side generally transverse alignment with
on the line 3*,3 of FIG. 2, some parts being broken
the central frame section. My invention is particularly 15 away, and the folded inoperative position thereof being
adapted to carry a ground-working agricultural imple
again shown in dotted lines;
ment of a substantially greater transverse dimension than
the distance between the wheels of a tractor, one type of
such an implement being a harrow. The use of the above
described type of agricultural implements becomes par
ticularly advantageous when several thereof can be pivot
ally connected in transverse end-to-end relationship
whereby to greatly increase the ground coverage of the
FIG. 4 is an enlarged view in horizontal section taken
on the line 4-4 of FIG. 1, some parts being broken
away to show other parts in section, and the folded in
operative position of my invention again being shown
in dotted lines; and
FIG. 5 is an enlarged view in vertical section taken on
the line 5--5 of FIG. l, some parts being broken away.
implement with each succeeding pass of the tractor.
Referring with greater particularity to the drawings,
Previously known types of the above described class of 25 the reference letter A represents a tractor, which includes
folding drag hitches have usually been characterized by
a folding action which comprises movements between
an operative and an inoperative position wherein the side
a rear axle b, and a conventional power lift represented
generally by the reference letter c, the latter compris
ing an upper transversely disposed rock-shaft d and a
frame sections of the hitch »and the implement swing
lower transversely disposed rock-shaft e. My invention
about generally parallel horizontally extending axes so 30 comprises `the tractor-mounted folding drag hitch for use
that said side frame sections extend in a generally verti
cal direction vadjacent the rear of the tractor. However,
in connection with the tractor A having the power lift c.
The drag hitch comprises a central frame section, rep
such previously known -types of folding actions have gen
resented generally by the reference numeral 1, and side
erally not produced optimum satisfaction since the verti
frame sections represented generally by the reference
cally extending height of the folded side frame sections 35 numerals 2, 3, respectively, the side frame sections 2», 3
is usually substantially greater than the height of the
being disposed in opposite side-by-side generally trans
tractor whereby to still provide a substantial amount of
verse alignment in operating position with the central
obnoxious interference during storage and transportation
frame section `1. The central frame section 1 is con
of the drag hitches.
structed ‘from a lower channel member 4, an upper chan
40
In light of the above explanatory introduction, an irn
nel member 5, end channel members 6, intermediate
portant object of this invention is the provision of a
struts 7, and angle braces 8, the foregoing all `being rigid
folding drag hitch wherein the central frame section there
ly secured together, as by welding.
of folds from a generally horizontally rearwardly extend
Referring more particularly to the central frame sec
ing position at the rear of the tractor to a generally
tion ,1, a plurality of rearwardly projecting lugs 9 are
angularly upwardly extending position, and wherein the
rigidly secured at their forward ends to the lower
side frame sections of the drag hitch swing forwardly 45 channel member 4. An elongated generally horizontally
about the opposite ends of the central frame `section to
ldisposed lower bar 10 is rigidly secured to the rearward
forwardly extending generally parallel positions on op
end of the lugs 9, and a transversely spaced generally
posite sides of the tractor.
Another object of this inevntion is the provision of a
folding drag hitch wherein the unique inoperative posi
tion of the same provides -a heretofore unknown amount
upstanding .arm 1,1 is rigidly secured at its lower end to
50 the lower bar 10 and also defines an 4axially alignable
bearing ring 12 at its upper end. An elongated generally
horizontally disposed upper shaft 113 is journalled within
of compactness whereby to greatly reduce the diñiculty
the bearing ring l12 deñned by the upper end of the arm
with which the sameimay be stored and transported.
11, said upper shaft 13 being journalled in general paral
Another object of this invention is the provision of a
55 'lelism with the lower bar l10. It is noted that the upper
folding drag hitch which is operatively connected to the
shaft 13 is also pivotally secured by means of bearing
power lift of a tractor and is actuated between its opera
lugs '14 some of which are rigidly secured to the inter
tive and inoperative positions by said tractor power lift.
mediate struts 7 of the central frame section 1 and others
A still `further object of this invention is the provision
of which are secured to the end channel members 6.
of a tractor mounted folding drag hitch which includes 60
Referring now to the- side frame sections 2, 3, both of
novel means for providing a leveling adjustment `for the
which are generally identical in construction, each there
hitch.
of comprises an elongated generally horizontally dis
posed lower bar 15 and a plurality of upstanding arms 16
Other objects of this invention reside in the provision'
which are rigidly secured at their lower ends to the lower
of a tractor-mounted folding drag hitch which may be
relatively economically manufactured, which is easy to 65 bar 15 and which define bearing rings 17 at their upper
mount and install on a tractor and which may be so
mounted without the use of special tools, which is dura
ends. Each of the side frame sections 2, 3 further corn
prises an elongated generally horizontally extending upper
shaft 18 which is journallel within the bearing rings 17
ble and strong in construction, and which is highly ef
of the upstanding arms 16. As seen particularly in FIG.
ficient in sustaining its purposes.
l, the outer ends 19 of the lower bar 10 of the central
70
The foregoing and other objects and advantages of
frame section 1 are pivotally connected to the inner ends
this invention will become apparent from the following
20 of the lower bars 15 of the side frame sections 2, 3 by
3,072,201
3
means of hinges 21 for pivotal movements about gen
erally parallel vertically extended axes. Also, the outer
ends 22 of the upper shafts 13 of the central frame sec
tion 1 are pivotally connected to the inner ends 23 of
the upper shafts 1S of the side frame sections 2, 3 by
means of a pair of universal joints 24 for universal swing
ing movements in cooperation with the beforesaid pivotal
4
the drawbar G by means of a short length of heavy
cha-in 41. It now becomes evident that the vertical
movement of the central frame section 1, in cooperation
with the unyielding linkage of the crank arm 39 to the
tractor drawbar G, results in the rotation of the upper
shaft 13 of the central frame sect-ion 1 in a direction to
swing the implement-supporting support rods 25 carried
by the central frame section 1 between a generally hori
movements of the hinges 21.
zontal ground-working lower position (as shown by the
In accordance with my invention, and with reference
particularly to FIGS. 2 and 3, a plurality of transversely lO full lines -of FIG. 3) and an upper inoperative position
wherein the implement-carrying support rods 25 of the
spaced elongated generally parallel implement support
central frame section 1 extend generally angularly up
rods 25 are rigidly but removably secured at their forward
wardly from the upper shaft 13 (as shown by the broken
ends to the upper shafts 13 and 18 of said frame sections
lines of FIG. 3).
1_3 in generally rearwardly projecting relationship and
Secondary linkage means is provided for the purpose
in general normality to said upper shafts 13 and 18. It 15
of causing pivotal movement of the implement-carrying
should be understood that this invention is designed for
side frame sections '2, 3 about their pivotal connections
use with any type of ground-working agricultural imple
to the central frame section 1 between a lower ground
ment; however, for the purpose of illustration, the same
working position (as shown by the full lines of FIGS. 2
is shown as equipped with conventional harrow sections
and 4) wherein said side frame sections 2, 3 are generally
26 which are of a conventional design and comprise sup
coplanar with the implement-carrying central frame sec
porting bars 27 which carry a plurality of tines 28. The
tion 1 to an inorperative position (as shown by the dotted
harrow sections 26 are rigidly but removably secured at
lines of FIGS, 2 and 4) wherein the side frame sections
their forward portions to the lower bars 1t), 15 of the
2, 3 are disposed in generally forwardly projecting rela
frame sections 1_3 by means of a plurality of link con
nectors 29, and are also similarly secured at their rear 25 tionship with respect to the central frame section 1 on
opposite sides of the tractor A. It should be noted that
ward portions to the rearward ends 30 of the support rods
the operation of the secondary linkage means is respon
25 by means of a plurality of chain connectors 31.
sive to the primary linkage means and at least partially
`In accordance with my invention, primary linkage
simultaneously actuated therewith for causing the above
means is provided for mounting the central frame section
1 to the tractor A and also for actuating the folding ac 30 described pivotal movement between said ground-work
ing position and said inoperative position.
tion of the drag hitch in response to the actuation of said
The secondary linkage means comprises a pair of elon
tractor power lift c. The primary linkage means com
prises a pair of transversely spaced generally horizontally
disposed elongated lower links 32 which are pivotally
secured at their rearward ends to` the lower channel mern- Y
ber 4 of the central frame section 1 by means of a pair
of bearing lugs 33. The lower links `32 are also pivotally
secured at their forward ends to the opposite ends of
gated upstanding generally parallel rock-shafts, each rep
resented generally by the reference numeral 42, one each
of which is pivotally secured by means of the brackets
43 to the opposite ends of the central frame section 1 in
spaced relation to the end channel members 6 of said
central frame section 1. Each of the rock-shafts 42 de
fines a diametrically extending upper arm 44, sometimes
the lower rock-shafts e of the tractor power lift c by
means of a pair of small crank arms 34. Also, a pair 40 referred to herein as a second arm, which is rigidly se
cured to the upper end of said rock shaft generally in
of transversely spaced elongated upper links 35 are gen
the lower links 32 and have their rearward ends pivotally
termediate the opposite ends 45, 46 thereof. Each of the
rock shafts 42 also defines a radially projecting lower
secured, as at 36, to the intermediate »struts 7 of the cen
arm 47, sometimes referred to herein as a first arm.
erally horizontally disposed in general parallelism with
tral frame section 1. The upper links 35 also have their 45 As seen particularly in FEGS. l, 4 and 5, the lower arms
47 of each of the rock shafts 42 are provided with ears
forward ends pivotally secured to the fender brackets f
48 which engage the upper shafts 18 of the side frame
of the tractor A. A pair of transversely spaced rearward
sections 2, 3. It is noted that the ends 45 of the upper
ly projecting lifting -arms 37 are rigidly secured at their
arms 44 of each of the rock-shafts 42 are connected by
forward ends to the opposite ends of the upper rock-shaft
d of the tractor power lift c. Also, a pair of -transversely 50 means of the ñeXible steel cables 49 to the forward end
451 of the crank arm 39 of the primary linkage means
spaced lifting links 38 are one each pivotally secured at
whereby the angular movement of the crank arm 39
their lower ends to a different one of the lower links 32
about the upper shaft 13 of the central frame section 1
generally intermediate the opposite ends thereof, the lift
imparts rotation to both of the rock-shafts 42 of said
ing links 38 also each being pivotally secured 4at their
upper ends to a dilîerent one of the rearward ends of the 55 secondary linkage means so that the angular movement
of the upper arrns 44 thereof causes the beforesaid swing
lifting arms 37. It should be noted that said primary
ing movements of said side frame sections 2, 3 whereby
linkage means is so arranged that when the lifting arms
to move the same between said lower ground-working
37 thereof are moved in an angular direction by the actua
position and said inoperative position.
tion of the power lift upper rock-shaft d, said central
It should be noted that the ends 46 of the upper arms
frame section 1 is moved in a generally vertical direction, 60
44 of the rock-shafts 42 are provided with coil springs
as shown by the broken lines of FIG. 3. It is also of
50 which are secured to the upper channel member 5
importance that the above described connection of the
of the central frame section 1 so as to provide a bias
forward ends of the lower links 32 to the crank arm
against the beforesaid angular movement of said upper
equipped lower rock-shaft e provides means whereby the
arms 44. The steel cables 49 are carried at their inter
relative positions between the upper links 35 and the lower
mediate portions by means of a pair of pulleys 51 which
links 32 many be adjusted by the actuation of the lower
rock-shaft e so as to provide a leveling adjustment for
are secured to the upper channel member 5 of the cen
tral frame section 1. It is also noted that the side frame
the drag hitch.
sections 2, 3, when same are in their lower inoperative
With further reference to the primary linkage means,
the same further includes a forwardly projecting elongated 70 positions, are pulled by and connected to the forward
crank arm 39 which is rigidly secured at its rearward end
to the upper shaft 13 of the central frame section 1, and
aiso has its forward end `49 disposed in spaced relation
to the tractor dr-awbar G.
portion of the tractor A by means of the steel cables 52.
In order to provide a support for the steel cables 52 when
the side frame sections 2, 3 are in their folded positions
adjacent the opposite sides of the tractor A, a pair of
The forward end 40‘ of the
crank arm 39 is pivotally but unyieldingly connected to 75 forwardly proiecting elongated lever arms 53 are pivot
5
3,072,201
6
lly secured by means of the upstanding U-bracket
equipped pedestals S4 to the upper channel member 5
of the central frame section l. Upward angular move
ship on opposite sides of said tractor.
ment is applied to the forward ends of the lever arms
53 when said side frame sections 2, 3 move to the above
2. A tractor mounted folding drag hitch for use in con
nection with a tractor of the type having a transversely
described inoperative storage positions on opposite sides
an inoperative position wherein said side frame sections
are disposed in generally forwardly projecting relation
disposed power lift rock-shaft, said hitch comprising a
of the tractor A by means of a pair of coil springs 55
central frame section for supporting an implement, a
which are secured at their upper ends to the rearward
pair of side frame sections for supporting implements
ends 56 of the lever arms S3. The lower ends of the
and disposed in opposite side-by-side generally transverse
coil springs 55 are secured to the upper channel member 10 alignment in operating position with said central frame
5 of the central frame section l, as particularly shown
section, said frame sections each comprising an elongated
in FlG. l. A pair of locking hooks 57 are pivotally
generally horizontally disposed lower bar, a plurality of
secured to the end channel members 6 of the central
transversely spaced generally upstanding arms rigidly se
frame section l (see FIG. l), and are adapted to hold
cured at their lower ends to said lower bar and defining
the side frame sections Z, 3 in their inoperative positions 15 axially alignable bearing means at their upper ends, and
on opposite sides of the tractor A. As seen particularly
an elongated generally horizontally disposed upper shaft
in FfGS. 2 and 3, a pair of stop arms 53 are secured
to the upper shaft ll3 and limit downward movement of
journalled within said bearing means defined by said
the implement support rods 25, and another pair of stop
lower bar, said drag hitch further comprising hinge
upper ends of said arms in general parallelism with said
arms 59 are secured to the upper shaft i3 to limit upward 20 means connecting the outer ends of the lower bar of said
movement or" the implement support rods 25 of the cen
trai frame section l and also to limit the swinging move
ment of the implement support rods 25 of the side frame
sections 2, 3.
central frame section to the inner ends of the lower bar
of said side frame sections for pivotal movements about
generally parallel vertically extended axes, a pair of uni
versal joints connecting the opposite outer ends of the
Having specifically described my invention, the oper 25 upper shaft of said central frame section to the‘inner
ative simplicity thereof is thought to be easily under
ends of the upper shafts of said side frame sections for
standable; however, it might be noted that the operation
universal swinging movements in cooperation with the
of my invention is controlled by means of the upper and
beforesaid pivotal movements, primary linkage means
lower rock-shafts d, e of the tractor power lift c. As
for mounting said central frame section to said tractor
noted above, the angular movement of the lifting arms 30 and for actuating the folding action of said hitch in re
37 in cooperation with the unyielding linkage of the
sponse to the actuation of said tractor power lift, said
crank arm 39 to the drawbar G of the tractor A imparts
primary linkage means including link elements connected
the above described swinging movements of the drag
to said power lift rock-shaft for moving said central frame
hitch between said ground-working operative position
section between a lower ground-working position and a
and said inoperative position wherein the side frame sec 35 generally angularly upwardly etxending inoperative posi
tions 2, 3 of my invention are disposed on opposite
tion, and secondary linkage means connecte-d to each of
sides of the tractor A. lt should again be emphasized
said side -frame sections and responsive to said primary
that the actuation of the crank arm-equipped lower rock
linkage means and at least partially simultaneously actu
shaft e of the tractor power lift c imparts a longitudinal
ated by said primary means for causing swinging move
movement to the lower links 32 whereby to provide an 40 ment of said side frame sections about their pivotal
adjustment for leveling7 the drag hitch.
connections to said central frame section between a lower
This invention has been thoroughly tested and found
to be completely satisfactory for the accomplishment of
ground-working position wherein said side frame sections
are generally coplanar with said central frame section
the above objects; and while I have shown and described
and an inoperative position wherein said side frame sec
above a preferred embodiment thereof in which the prin 45 tions are disposed in generally forwardly projecting rela
ciples of the present invention have been incorporated,
tionship on opposite sides of the tractor.
l wish it to be specifically understood that the same may
3. A tractor mounted folding drag hitch for use in
be modified without departure from the scope and spirit
connection with a tractor of the type having a trans
of the appended claims.
versely disposed power lift rock-shaft and also having a
What I claim is:
50 rearwardly projecting drawbar, said hitch comprising a
l. A tractor mounted folding drag hitch for use in
frame section for supporting an implement, said frame
connection with a tractor of the type having a trans
section including an elongated generally horizontally dis
versely disposed power lift rock-shaft, said hitch com
posed shaft rotatably journalled by said frame section,
prising a central frame section for supporting an irn
said hitch further comprising linkage means for mount
plement, and a pair of implement .equipped side frame 55 ing said frame section to said tractor and for actuating
sections for supporting implements and disposed in op
the folding action of said hitch in response to the actu
posite side-by-side generally transverse alignment in oper
ating position with said central frame section, said side
ation of said tractor power lift, said linkage means com
prising a pair of transversely spaced generally horizon
frame sections being pivotally connected on opposite sides
tally disposed elongated lower links pivotally secured at
of said central frame section, means mounting said frame 60 their rearward ends to said frame section and pivotally
sections to said tractor adjacent the rear thereof, pri
mary means mounting said central frame section to said
tractor and also connected to said power lift rock-shaft
secured at their forward ends to said tractor, a pair of
transversely spaced elongated upper links generally hori
zontally disposed in general parallelism with said lower
links and having their rearward ends pivotally secured
for imparting swinging movements to said central frame
section between a lower ground-working position and a 65 to said frame section and their forward ends pivotally
generally angularly upwardly extending inoperative posi
tion in response to the actuation of said tractor power
lift, and secondary means connected to each of said side
secured to said tractor, a pair of transversely spaced rear
wardly projecting lifting arms rigidly secured at their
forward ends to the opposite ends of the power lift rock
frame sections and including linkage associated with said
shaft of said tractor, a pair of transversely spaced lifting
primary means and at least partially simultaneously actu 70 links one each pivotally secured at its lower end to a
ated by said primary means for imparting swinging move
different one of said lower links generally intermediate
ment to said side frame sections about their pivotal con
the opposite ends thereof and pivotally secured at its
nections to said central frame section between a lower
upper end to a different one of said lifting arms, said
ground-working position wherein said side frame sections
linkage means being so arranged that when said lifting
are generally' coplanar with said central frame section and 75 arms are moved in an angular direction by the actuation
3,072,201
of said power lift rock-shaft that said frame section is
moved in a generally vertical direction, a forwardly pro
jecting elongated crank arm rigidly secured at its rear
ward end to said shaft and having its forward end dis
posed in spaced relation to the drawbar of said tractor,
and a connecting link pivotally secured at one end to
said tractor drawbar and pivotally secured at its other
end to the forward end of said crank arm, whereby the
vertical movement of said frame section in cooperation
with the unyielding linkage of said crank arm to said
drawbar results in the rotation of said shaft in a direc
tion to swing said frame section between a generally hori
8
central frame section between a generally horizontal
ground-working lower position and a generally angularly
upwardly extending inoperative position, and secondary
linkage means connected to each of said side frame sec
tions and responsive to said primary linkage means and
at least partially simultaneously actuated by said pri
mary means for causing swinging movement of said side
frame sections about their pivotal connections to said
central frame section between a lower ground-working
position wherein said side frame sections are generally
coplanar with said central frame section and an inper
ative position wherein said side frame sections are dis
angularly upwardly extending inoperative position.
posed in generally forwardly projecting relationship on
opposite sides of said tractor.
of side frame sections for supporting implements and
age means defining radially projecting rigid iirst and
disposed in opposite side-by-side generally transverse
alignment in operating position with said central frame
second arms, said first arms each engaging a different
one of the upper shafts of the adjacent side frame sec
zontal ground-working lower position and a generally
5. The structure defined in claim 2 in which said sec
4. A tractor mounted folding drag hitch for use in 15
ondary linkage means comprises a pair of elongated up
connection with a tractor of the type having la trans
standing generally parallel rock-shafts one each pivot
versely disposed power lift rock-shaft and also having a
ally secured at the opposite ends of said central frame
rearwardly projecting drawbar, said hitch comprising a
section, each of said rock-shafts of said secondary link
central frame section for supporting an implement, a pair
section, said frame sections each-comprising an elon
gated generally horizontally disposed lower bar, a plu
rality of transversely spaced generally upstanding arms ‘
rigidly secured at their lower ends to said lower bar and
deiining axially alignable bearing means at their upper
tions of said hitch, said second arms being connected
by iiexible linkage means to said link elements of said
primary linkage means whereby the movement of said
link elements imparts rotation to both of the rock-shafts
of said secondary linkage means so that the resulting
ends, and an elongated generally horizontally disposed
angular movement of the first arms thereof causes the
lelism with said lower bar, said drag hitch further com
prising hinge means connecting the Outer ends of the
section whereby to move the same between said lower
beforesaid swinging movements of said side frame sec
upper shaft of journalled within said bearing means de
fined by said upper ends of said arms in general paral 30 tions about their pivotal connections to said central frame
lower bar of said central frame section to the inner ends
of the lower bars of said side frame sections for pivotal
movements about generally parallel vertically extended
axes, a pair of universal joints connecting the opposite
outer ends of the upper shaft of said central frame sec
tion to the inner ends of the upper shafts of said side
frame sections for universal swinging movements in co
operation with the beforesaid pivotal movements, pri
ground-working position and said inoperative position.
6. The structure deñncd in claim 4 in which said sec
ondary linkage means comprises a pair of elongated up
standing generally parallel rock-shafts one each pivot
ally secured at the opposite ends of said central frame
section, each of said rock-shafts of said secondary link
age means defining radially projecting rigid first and
second arms, said iirst arms each engaging a different
one of the upper shafts of the adjacent side frame sec
tions of said hitch, said second arms being connected
by flexible linkage means to said forwardly projecting
crank arm of said primary linkage means whereby the
angular movement of said crank arm of said primary
ing a pair of transversely spaced generally horizontally 45 linkage means about the axis of the upper shaft of said
central frame section imparts rotation to both of the
disposed elongated lower links pivotally secured at their
rock-shafts of said secondary linkage means so that the
rearward ends to said central frame section and pivotally
resulting
angular movement of the first arms thereof
secured at their forward ends to said tractor, a pair of
causes the beforesaid swinging movements of said side
transversely spaced elongated upper links generally hori
zontally disposed in general parallelism with said lower 50 frame sections about their pivotal connections to said
mary linkage means for mounting said central frame
section to said tractor and for actuating the folding
action of said hitch in response to the actuation of said
tractor power lift, said primary linkage means compris
links and having their rearward ends pivotally secured
to said central frameA section and their forward ends
pivotally secured to said tractor, a pair of transversely
spaced rearwardly projecting lifting arms rigidly secured
at their forward ends to the opposite ends of the power 55
lift rock-shaft of said tractor, a pair of transversely
spaced lifting links one each pivotally secured at their
lower ends to a different one of said lower links generally
intermediate the opposite ends thereof and pivotally se
central frame section whereby to move the same be
tween said lower ground-working position and said in
operative position.
7. The structure defined in claim 2 in which said hitch
comprises a plurality of transversely spaced elongated
generally parallel implement support rods secured at their
forward ends to the upper shafts of said frame sections
in generally rearwardly projecting relationship and in
general normality thereto, and in which said implements
cured at their upper ends to a different one of said lifting 60 which equip said frame sections are carried by said sup
arms, said primary linkage means being so arranged that
when said lifting arms are moved in an angular direc
port rods and by the lower bars of said frame sections.
8. The structure defined in claim 3 in which said hitch
comprises a plurality of transversely spaced elongated
tion by the actuation of said power lift rock-shaft said
generally parallel implement support rods secured at their
central frame section is moved in a generally vertical
direction, a forwardly projecting elongated crank arm 65 forward ends to the rotatably journalled shaft of said
frame section in generally rearwardly projecting reiation
rigidly secured at its rearward end to said upper shaft
ship and in general normality thereto, and in which
of said central frame section and having its forward end
said implement which equips said frame section is
disposed in spaced relation to the drawbar of said trac
carried by said support rods and by said frame section.
tor, a connecting link pivotally secured at one end to said
9. The structure defined in claim 4 in which said hitch
tractor drawbar and pivotally secured at its other end 70
to the forward end of said crank arm, whereby the ver
tical movement of said central frame section in cooper
ation with the unyielding linkage of said crank arm to
said drawbar results in the rotation of the upper shaft
of said central frame section in a direction to swing said 75
comprises a plurality of transversely spaced elongated
generally parallel implement support rods secured at their
forward ends to said upper shafts of said frame sec
tions in generally rearwardly projecting relationship and
in general normality thereto, and in which said imple
l»
@einem
ments which equip said frame sections are carried by
said support rods and by the lower bars of said frame
sections.
l0. The structure deñned in claim 3 in which the
tween said upper lint-:s and seid lower links may be
power lift of said tractor is of the type having7 a second
adjusted by the actuation of the second rocioshaft of
transversely extending rock-shaft, and in which the lower
said tractor power lift so as to provide a. leveling adjust
links of said linkage means are connected at their for
ward ends to the second rock-shaft of the power lift of
ment for said hitch.
said tractor whereby the relative positions between said
upper links and said lower links may be adjusted by the 10
actuation of the second rock-shaft of said tractor power
lift s0 as to provide a leveling adjustment for said hitch.
11. The structure defined in claim ¿t in which the
power lift of said tractor is of the type having a second
transversely extending rock~shaft, and in which the lower 15
i
.or
links of said primary linkage means are connected at
their forward ends to the second rock-shaft of the power
lift of said tractor whereby the relative positions be
Referenees ‘Cited in the tile of this patent
UNITED STATES PATENTS
i,927,458
2,687,073
2,69‘G,ll0
Klis@ _______________ __ Sept. 19, 1933
Thorp ______________ __ Aug, 24, 1954
Crouch et al. ________ __ Sept. 28, 1954
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