Improvement in Rolling Harrows.
Year: 1897

page_text: Date of Application, 25th May, 1897-Accepted, 7th May, 1898
COMPLETE SPECIFICATION.
Improvement in Rolling Harrows.
We, AUGUST W. HAGSTROM and GUSTAF ANDERSON, both of Chino, in the County
of San Bernardino, and State of California, United States of America, Gentlemen,
do hereby declare the nature of this invention and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement:-
―
Our invention has relation to improvements in rolling harrows, and the object
is to provide a harrow that will effectually break up and disintegrate the soil, and
more particularly the virgin soil that has never been cultivated. To this end
the novelty consists in the construction, combination and arrangement of the same
as will be hereinafter more fully described and particularly pointed out in the
claims.
In the accompanying drawings the same figures of reference indicate the same
parts of the invention.
Figure 1 is a top plan view of our improved harrow;
Figure 2 is a side elevation of the same;
Figure 3 is a sectional elevation on the line
Figure 4 is a front view of the harrow; and
of Fig. 1;
Figure 5 is a transverse section of one of the harrow shafts.
2-2, 221 represent the rectangular main frame, and its forward end is
provided with two castor wheels 3-3, and in the side pieces 2-2, near the rear
end, is mounted a driving shaft 4, journaled in boxes 5, secured to braces 6, con-
necting the rear piece 2¹ of the frame with the cross brace 7 secured to the
sides 2-2.
88 are clutch couplings sliding on the shaft 4 and revolved with it by the
usual key 9 on the shaft working in a key way in the coupling, which is operated
by a forked lever 10 fulcrumed to an arm 11 secured to the brace 6. The rear
end of this lever 10 is pivoted to a connecting rod 12 secured to a hand lever 13
above its fulcrum on the rear frame piece, and a similar connecting rod 12' is con-
nected to a similarly mounted forked lever 10¹ to operate a clutch coupling 8¹ on
the opposite end of the shaft 4.
14-14 are sleeves revolving on opposite ends of the shaft 4, and their inner
ends are provided with sprocket wheels 16-16, the inner face of which is formed
with a clutch 17, which is engaged by the sliding clutch 8. These revolve on.
the shaft 4, as before stated, and they are also journaled in boxes 18, bolted to
the sides 2-2 of the frame.
To the outer ends of the shaft 4 are secured the traction wheels 15-15, and
as they rotate the shaft 4, the said shaft at all times rotates the clutches 8-8.
These clutches engage the clutch on the sprocket wheels 16-161 when the lever 13
is operated to throw them into gear, and reversely the sprocket wheels remain
stationary on the shaft when the lever 13 is thrown in the opposite direction.
19-19, 20-20 represent the side and end pieces of the harrow-shaft frame,
suspended immediately below the main frame by pitmen 21-21 pivoted to the
Price R71

page_text: outer ends of the bell-crank levers 22-23, the upper ends of which are pivoted
to pitmen 24, the rear ends of which are connected to the upper ends of the crank-
arms 25 secured to the outer ends of the shaft 26. About midway of this shaft 26
is secured an operating hand-lever 27, engaging the usual semicircular tooth
rack 28 to adjust the harrow-shaft frame to the proper depth, or to raise it so
that the harrow teeth will clear the ground when the harrow is being taken from
place to place.
The forward harrow shaft 29 consists of the sleeve 29' provided with the solid
ends 292 292, and it is journaled in boxes secured to the sides 19-19 of the
harrow shaft frame. It is also provided with bearing boxes 31-31 secured to
the longitudinal braces 32-32 secured to the front and back pieces 20-20 of
said frame.
The outer ends of this shaft 29 and the rear shaft 43 project through arc-shaped
guides 33 secured to the side pieces of the main frame, and the extreme ends
rotate in a flat strap 34, running back to the main driving shaft 4, its end being
journaled thereon between the inner face of the hub of the traction wheel and
the outer edge of the sprocket sleeve.
Upon each end of the harrow shaft 29, just inside of the frame, is secured a
sprocket wheel 35-35 over which runs a sprocket chain 36-36¹ to the sprocket
wheels 16-16' on the main driving shaft 4, and from the sprocket wheels 37–371
on the shaft 29 similar chains 38-381 run to the sprocket wheels 39-39 on the
second harrow shaft 40, and by its sprocket wheels 41-41' motion is transmitted
to the sprocket wheels 42-421 on the rear harrow shaft 43, so that all three
harrow shafts are rotated simultaneously in the same direction.
These harrow shafts are all constructed alike, and any number of them may be
used according to the nature of the soil and the work to be performed, the teeth,
of course, on one shaft being arranged to follow in the spaces between the teeth
on the other shafts, so that no two lines of teeth will follow in the same plane.
The teeth on the forward shaft 29 and the rear shaft 43 pass between a series
of stationary teeth 51 secured to the front and rear of the harrow shaft frame,
and they serve to remove any soil that may adhere to the revolving teeth on these
shafts when the machine is in operation.
The cimeter shaped harrow teeth are constructed in pairs as shown in Fig. 5, 44
and 45 being mates. The tooth 44 is formed with a rigid collar 46 and an elon-
gated shank 47, which extends diametrically through the hollow harrow shaft,
and its projecting end 48 is screw threaded, which receives the elongated nut 49
which is screwed on tightly to hold the tooth 44 rigidly on the shaft, and the
screw threaded shank 50 of the opposite tooth 45 is then secured in the nut as
shown.
A clevis of the usual form is attached to the front end of the machine, to which
the team is hitched to draw the same.
Although we have specifically described the construction and relative arrange-
ment of the several elements of our invention, we do not desire to be confined to the
same, as such changes or modifications may be made as clearly fall within the
scope of our invention, without departing from the spirit thereof."
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is: _
1. A rolling harrow comprising the main frame provided at its forward end
with castor wheels and its rear end with traction driving wheels, in combination
with the harrow shaft frame, in which are journaled the shafts carrying the
harrow teeth, and means substantially as described for rotating said harrow
shafts and raising and lowering said frame with reference to the main frame,
substantially as and for the purpose set forth.
2. A rolling harrow comprising the main frame provided with the driving

page_text: shaft 4, its sprocket wheels 16-161, sprocket chains 36-36¹, the shaft 26, its
crank-arms 25, pitmen 24, bell crank levers 22-23 and pitmen 21-21, and the
arc-shaped guides 33, in combination with the harrow shaft frame provided with
the harrow shafts 29, 40, 43, having teeth 44 45, and sprocket wheels and
driving chains, substantially as shown and described.
3. A rolling harrow comprising the main frame, the driving shaft, its traction
wheels secured thereto, and the sprocket wheels mounted thereon and adapted
to be driven by the clutches on said shaft, in combination with the adjustable
harrow shaft frame, comprising the harrow shaft 29, its ends provided with
sprocket wheels operated by chains driven by the sprocket wheels on the driving
shaft, and having its ends projecting through arc-shaped guides secured to the
main frame, and connected to said driving shaft by strap connections, substantially
as shown and described.
Doted this 25th day of Mov 1907
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.