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Патент USA US3074500

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Jan. 22, 1963
3 Sheets-Sheet 1
Filed April 26, 1961
FIG: 1
Jan. 22, 1963
Filed April 26, 1961
5 Sheets-Sheet 2
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Jan. 22, 1963
Filed April 26, 1961
3 Sheets-Sheet 3
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United States Patent 0 "ice
Patented Jan. 22, 1963
' stant rotary tiller is less top heavy than conventional tillers,
its length preferably exceeding its height, and therefore
The present invention relates to rotary tiller construc
tions and more especially to the improved means for ef
substantially more efficiently operated. The frame as
sembly, common to prior art devices is thus eliminated
and the transmission may be substantially beneath the
motor drive, resulting in a more compact, stabilized culti
vating instrument. This invention also results in more
facile access to the drive housing and reduced lateral
Sam Bums, Louisville, Ga.
Filed Apr. 26, 1961, Ser. No. 105,790
5 Claims. (Cl. 172-42)
bending and vibrational defects by reason of a lower cen
fecting transmission of motive energy from a source of
power to complemental cultivating and/ or carriage com 10 ter of gravity and unique positioning of motor drive.
ponents and is a continuation-in-part of my copending
Within the present invention, the tiller transmission
application Serial No. 832,117, ?led August 6, 1959 and
includes a hardened steel gear and train transmission
which is adapted to run friction-free due to the fact that
the gear train elements operate in a bath of oil substan
now abandoned.
Conventional rotary tillers or walking cultivators com
prise generally a frame assembly within which is mounted
a drive or transmission housing and upon which are se
tially heat free and needle bearings together with double
seals bear the respective elements within the transmission
cured, at opposite ends, gasoline motor drive; hitch com
ponents; carriage components and means for guiding the
instrument during operation. Rotary cultivating means
to insure a longer and more e?‘icient operation. This gear
case or transmission housing is preferably made of
various tiller components. Vibrations induced by oper
ation of the motor drive and continuous irregular strik
with means for transmitting motive power to the tilling 1
stamped steel, ground and hardened steel shafts journalled
are normally mounted adjacent the bottom of a transmis 20 in needle bearings.
The objectives of invention include providing a sub-.
sion housing and transversely thereof, and connected
stantially frameless assembly for a rotary tiller which is
thereby to the motor drive. Handle bars, including a
speci?cally adapted to maintain the operating components
pertinent motor drive control means for acceleration, en
in a maximum utility and e?iciency correlation.
gagement and disengagement, are pivoted upon the frame.
A further objective of invention resides in the creation
Generally, the motor drive, hitch and drive housing com 25
of a rotary tiller wherein respective driving, tilling and
ponents are bolted to the frame assembly resulting in lack
control elements may be retained in rigid interconnection
of sufficient rigidity in the frame or chassis to support the
ing of the earth by the rotary tiller tines or slashers, re
sult in loosening of the mounting bolts. Consequently,
one experiences impaired ef?ciency and frequent break
down of the components and means for transmitting pow
er between respective motive and cultivating elements.
This frame-type rotary tiller assembly, known in the art, 35
is moreover lacking in rigidity due to interdependence '
upon a separate frame construction to effect means for
interengaging the source of power to the operating instru
ment. Drive housings in the art are ?imsy due to their
A still further objective of invention is to create a
rotary tiller construction in which the relative center of
gravity is materially lower than in prior art devices,
thereby creating increased efficiency of operation and
control, during operation.
With the above and other objectsin view, which will
become apparent as the description proceeds, the inven
tion resides in the combination and arrangement of parts
and in the details of construction hereinafter described and
claimed, it being understood that changes in the precise
sheet metal. In such prior art devices, frame members
within which the housing of the transmission is mounted
embodiment of the invention herein'disclosed may be
made within the scope of what is claimed, without de
parting from the spirit of the invention.
the same and where the extension of the housing is both
housing shown in FIGURE 2;
thin-walled construction which is conventionally of light
In the accompanying drawings:
abut the housing medially and support the housing against
FIGURE 1 is a view in perspective of invention;
lateral bending which is induced by the moving action of 45
FIGURE 2 is a vertical sectional view of the housing
the rotary tiller at the lower end of the housing. Yet,
shown in FIGURE 1, the speci?c section line being taken
another shortcoming of such frame-type rotary tillers re
along the line 2—2 of FIGURE 3;
sides in top heaviness due to the pronounced extension of
FIGURE 3 is an end sectional view of the transmission
drive housing below the frame assembly and often above
below and above housing must be supported medially to
prevent lateral bending.
In the present invention, this tiller construction'includes
a drive housing which is characterized by its rigidity and
elongated triangular con?guration which combinatively
eliminates the necessity for a frame assernlby of the type
FIGURE 4 is a top plan view of the components shown
in FIGURES 2 and 3 together with engine and hitch
mounting elements;
FIGURE 5 is a side elevational view of the components
shown in FIGURE 4.
The basic tiller 100 shown in FIGURE 1 comprises an
engine 110 having crank shaft and pulley 112, tension
currently known in the prior art. Additionally, the
clutch, V-belt and sheave 114, 116 and 118 respectively,
unique means for transmitting power from the engine
disposed in power transfer and idle relation to the gear
components to the operating cultivators and reducing the
transmission which is located beneath. The clutch is
speed thereof are unique by reason of the speci?c ar 60 mounted for arcuate movement to engage and disengage
rangement of gear reduction and transmission elements
the belt in the well known manner. The handle bars for
in the combination housing permitting both motor drive
the device are generally indicated by the numeral 120,
and hitch components to be attached directly to the
the same engaging respectively engine and hitch mounts
motor drive or housing or transmission assembly.
and having suitable clutch control. Cultivating depth
ditionally, due to the rigid construction of the drive hous 65 control, during operation, is effected by the vertically ad
ing bending moments applied thereto are reduced sub
justable brake 130 having rearwardly inclined, ground~en
stantially completely. Moreover, since there is no re
gaging prong 134, acting in complement to rotating and
quirement for medial support of the drive housing, the
cultivating tines 140, the carriage wheels 136 being also
height of the housing may be reduced substantially re
suitably and adjustably located in the hitch for either ad
sulting in consequent lower positioning of hitch and 70 ditional depth control or carriage of the device during
non-operating transport. The respective brake and car
motor drive components and a lower center of gravity
riage standard have adjusting bores 132 and 138 respec
to the overall tilling instrument. Accordingly, the in
tively. permitting vertical adjustment as shown more spe
ci?cally in FIGURE 5.. It will beobvious to those skilled
in the art that various substitute static cultivating instru
ments may be used in lieu of the braking element 130'.
For instance, it is within the spirit of invention to sub
casing ?anges 160.
Projections 256 and 256' inhibit ex
cessive V-belt flapping during idling.
The hitch 260 is secured to ?ange 160- by a substantially
bination; plural pronged sidewishbone attachments in
angular element consisting of horizontal plates 262 and
262’ and 264, terminating in a yoke having parallel arms
265, 265’ which are spaced apart by the stabilizer 268.
Adjustable retention of the standard 130 and carriage stern
136 is e?ected by bolts 266 per the FIGURES iliustra
place or any combination of the aforementioned.
stitute combined ridging andhilling plows; double mold
board plows; sweep plows either individually or- in com
ing such attachments, the carriage assembly 136 is pref 10
I claim:
erably removed. from the hitch.
1. A rotary tiller comprising
a ?at sided narrow transmission housing of substan
With reference'now. to FIGURES 2 and 3', the trans
mission comprises opposed ?at-‘sided matched sections
153 and 150’ the same de?ning a stamped cavity for the
transmission elements. The uppermost portion of the 15
gear train is retained in a small upright extension 152 of
the housing. The con?guration of the transmission gear
tially symmetrical triangular con?guration disposed
to extend in a fore and aft direction with its base up
permost and horizontal,
a short upright extension on said housing base posi
tioned centrally of said housing in vertical relation
case and its cavity extend from front to rear at 154 and
to the apex thereof and forming an integral part of
154’ respectively, to provide a substantially symmetrical
said housing,
triangular shape. The trianglezwith its apexdownward 20
has a base formed by the horizontal fore and aft top sur
face and has anever-diminishing, triangular con?gured
lower portion expanded as at 156 and 156’ to meet and
form the lower cavity at 158, the lower cavity con?ning
the drive sprocket. The entire gear and chain transmis
sion is sealed in a bath of oil, by joining the respective
opposed ?anges 169 of the opposed matched sections 7150
and 15%’.
Now the engine drive shaft 170‘being keyed to sheave
118 bears in the respective casing components 150 and 30
15%’ at 168 and 168' respectively in a needle bearing
journal, the drive shaft being. keyed to driving gear 174,
which in turn has, meshing connection with idler spur‘
gear 174'. Spur gear 174-’ rotates upon the idler axle
172, the latter having needle bearing support within the
opposed easing depression counterparts 166 and 166'. It
will be noted that the respective driving and spur gears
a transverse drive shaft journalled in said housing ex
at least one intermediate transverse shaft journalled in
said housing,
a transverse driven shaft journalled in the apex of said
gearing within said’ housing and housing extension in
terconnecting said drive shaft, intermediate shaft and
said driven shaft,
said drive shaft, intermediate shaft and driven shaft
lying in a vertical plane transverse to saidv housing,
a motor driving unit operatively connected to said
drive shaft,
means on the base of said housing forwardly of said.
housing extension providing a support for said motor
driving unit to which the same is secured,
rotary tiller means mounted on said driven shaft on
each side of said housing,
174 and 174' are each spacially set'within the housing
and ground engaging control means, adjustably secured.
by respectivespacer bushings 176 and 176’.
to the base of said housing rearwardly of said housing
The chain drive used in this system includes preferably 40
a silent chain 186 in which together with the sprocket
2. The rotary tiller of claim 1, wherein a bracket pro-.
wheels one obtains rotational speed inversely proportional
viding spaced parallel arms substantially in horizontal
to the number of teeth. The. respective spur gears being
alignment with said motor driving'unit support extends
equivalent in diameter are‘ preferably attached to their
rearwardly from the base of said housing, said control
corresponding shafts by Woodruff keyor the like, each 45 device including a standard ?tted between said bracket
being mounted for rotational interconnection with the
arms, means adjustably securing‘ said standard to said
reduction, gear 178, likewise bearing mounted substan
bracket arms, and a handle‘ structure secured in part to
tially centrally of'the transmission housing in opposed
said bracket.
casing depression counterparts 1'64 and 164’. Now 're
3. The rotary tiller of claim 1 wherein the length of
duction gear 178 and sprocket 180'are each ?xed together 50 the housing exceeds its height.
to transmit power through they chain/to the cultivator
4. The rotary tiller ofclaim 2 wherein the length of
drive sprocket 13-2, saidsprocket being keyed to the driven
the housing exceeds its height.
cultivator shaft 184 mountedin opposed casing depres
5. The rotary tiller of claim 3 wherein the transmission
sion counterparts162 and’162'. A suitable bushing 188
further comprises opposed, matched sections which are
is utilized in connection with shaft 184 to prevent trans- 55 sealed together.
verse sliding movement.
In FIGURES 4 and 5 the static mount 250 and hitch
. 260 are each depicted.
References Cited in’ the ?le of'this. patent
The mount 250‘1has'correspond
ing plane surfaces 252 and 252’ upon which to mount the
engine. Suitable ?ange 254 is adapted to engage the 60
Merry ____ __, _________ __ Oct. 21, 1952
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