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Патент USA US2405503

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Aug-6,1946. -
Filed Aug. 29, 1944
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Patented Aug. 6, 1946
~ 2,405,503
Dudley L. Hill, Peekskill, N. Y.
Application August 29, 1944, Serial No. 551,664
2 Claims. (01. 97-60)‘
My invention relates to cultivating implements
and has particular reference to implements for
destroying weeds around a plant without harm
ing the plant itself.
eration, the final operative position being shown
in dotted lines;
Fig. 2 is a top plan View of the same.
My cultivating implement as shown in Figs. 1
This is continuation in part of my application 5 and 2 comprises a yoke having a horizontal or
bight member I and legs 2 with sharp ends 3 for
My invention has for its object to provide an
insertion into a ground 4. The upper horizon
implement which can be used for undercutting
tal member is provided with a centralenlarged
the roots of weeds around a plant, leaving a cir
portion 5 with a hole for a bearing 6 secured to
cular area at the plant untouched where the roots
the member I by bolts 1. The bearing is threaded
of the plant are located, and e?ectively destroying
in its upper portion at 8 for a threaded enlarge
the weeds which otherwise would interfere with
ment [0 on a shaft l l. The latter is provided
the normal growth of the plant.
with a handle or handle bars l2 at the top for
Another object of my invention is to provide
its manual rotation. The lower end of the shaft
a cultivating implement having rotary knives for 15 is relatively short and is adapted for removably
undercutting the roots of the weeds around the
supporting a bushing or sleeve [3 with arms [4
plant, the knives being so constructed as to
attached to the upper edge of a tubular member
penetrate the soil to a certain depth thereby
l5. A screw it‘ is threaded into the bushing [3
loosening the upper layer of the soil for facilitat
for locking the same on the shaft l l.
ing the absorption of air and moisture.
The lower edge of the tubular member I5 is
Another object of my invention is to provide
tapered to a sharp edge at l8 so that it can be
the cutting knives for the weeds of such a shape
forced into the soil under pressure. Cutting
that the knives, while working on a relatively
blades or knives 20 are attached to the sides of
large area around the plant, will be easy to op
the tubular member at a small elevation above
erate, each knife having gradually receding por 25 the lower sharp edge Ill. The blades are inclined
tions toward the periphery so that different por
downward at their cutting edges in the same di_
tions of the knife will successively engage the
rection in which the threads on the shaft are
soil, thereby avoiding an excessively large torque
made, preferably for the right hand or clockwise
or force which would be required if all the por
rotation, looking at the blades from the top, The
tions of the knife began .their cutting action at 30 blades therefore will gradually sink into the soil
the same time.
when the shaft is rotated. To facilitate the soil
Another object of my invention is to provide
cutting operation, the blades are so shaped that
weed-cutting knives on my implement of such a
the inner cutting portions 2| are below the outer
shape that they will cut and loosen the top soil
portions 22 and, besides, the inner portions are
around the plant and will form a funnel-shaped 35 advanced ahead of the outer or peripheral por
Serial No._521,925, ?led February 11, 1944.
bed under the loosened soil, thereby facilitating
the movement of the rain water toward the cen
trally located roots of the cultivated plant.
tions, Different portions of the blades, therefore,
will enter the soil at different times so that the
force for rotating the shaft will be materially
For operating the implement, the yoke is placed
Still another object of my invention is to pro
vide a cultivating implement in which the cutting
knives can be worked into the top soil around
on the ground with the tubular member l5 en
the plant to a predetermined depth, upon reach
closing a plant 23. Different tubular members
ing which the rotation of the knives may con
may be fastened to the shaft by the screw l6,
tinue without any further deepening of the cut.
depending on the size of the plant. The sharp
Still another object of my invention is to pro 45 points 3 of the yoke are forced into the ground
vide a supporting frame for the shaft, carrying
until the sharp edge I8 also enters the ground.
the cutting knives, the‘ frame being adapted to
The blades 20 will be then just above the ground.
be immovably supported on the ground above the
The handle 12 is then rotated in a correct direc
plant to be cultivated while the shaft with the
tion, causing the threaded portion I0 of the shaft
knives is manually rotated.
50 to be screwed into the bearing 6, thereby advanc
My invention is more fully described in the
ing the blades downward into the soil. The down
accompanying speci?cation and drawing in
ward movement of the blades will continue until
the threaded portion l 0 ?nally leaves the thread
Fig. 1 is a sectional elevational view of my
ed portion of the bearing. The rotation can be
cultivating implement at the beginning of its op 65 then continued without advancing the blades any
ting edges inclined downwards in a direction of
their movement when the shaft is rotated in a
corresponding direction, the upper edges of the
25. To remove the blades, the shaft can be
blades being substantially in the same plane, the
turned in the opposite direction, causing the
threaded portion In to be screwed into the thread GI tubular member being arranged to be placed on
the ground around a plant to be cultivated; and
ed portion of the bearing 6.
threaded engagement between the shaft and the
It should be noted that the funnel-shaped de
supporting means to move the shaft axially in
pression is very bene?cial to the plant because
response to its/rotation.
the downward sloping sides of the depression will
2. A cultivating implement comprising a shaft;
direct rain water toward the roots of the plant
means to support the shaft for rotation in a ver
tical position; a tubular member supported at the
The depth of the penetration of the blades 29
lower end of the shaft open at both ends; blades
into the soil can be adjusted by releasing a look
extending outwards from the lower portion of the
ing screw 26 in a collar or bushing 21, moving
7 member and having cutting edges inclined down
the collar to a new position, and again tightening
wards in a- direction of their movement when the
the screw 2%.
The sharp edges l8 of the tubular member l5, ‘ ‘shaft is rotated in a corresponding direction, the
member being arranged to be placed on the
by penetrating into the soil, will also out such
ground around a plant to be cultivated; an en
roots of the surrounding weeds which may extend
into the area around the plant and within the pe- - larged portion on the shaft in threaded engage
ment with the supporting means; and smooth
riphery of the tubular member.
vportions on the shaft at either side of the en
What is claimed as new and desired’ to be se
larged portion for allowing free rotation of the
cured by Letters Patent is:
shaft when the enlarged portion leaves the
1. A cultivating implement comprising a shaft;
means to support the shaft for rotation in a verti 25 threaded engagement with the supporting means;
and sharp-pointed prongs on the supporting
cal position; a tubular member open atboth ends
means for engaging the ground at the sides of
adiustably supported at the lower end of the
the plant,
shaft; blades extending outwards from the lower
portion of the tubular member and having cut
further. The blades will merely churn the top
layer of the soil above a funnel-shaped depression
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