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Патент USA US3067543

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Dec. 11, 1962
2 Sheéts-Sheet 1
Filed April 25, 1960
23 24_
JD kn N A. P\ T
D€C. 11, 1962
Filed April 25, 1960
2 Sheets-Sheet 2
IIVVE m'ore
D'y 711M
United States atent O
John Arthur Howard, West Horndon, England, assignor
to Rotary Hoes Limited, West Horndon, England
Filed Apr. 25, 1960, Ser. No. 24,412
Claims priority, application Great Britain Apr. 28, 1959
1 Claim. (Cl. 37—94)
Patented Dec. 11, 1962
FIGURE 6 is a view in the direction of the arrow “6”
in FIGURE 4 but drawn to a smaller scale.
Referring ?rst to FIGURE 1, the machine includes a
digging wheel 10 which is supported at its remote side
fro-m a frame 11 which can be moved along vertical guides
12 by a hydraulic piston and cylinder arrangement 13 so
that the machine can be raised or lowered for varying
the depth of the trench to be dug. The machine includes
a transverse shaft in a tubular casing 14 adjacent the
The invention relates to a trench digging machine of
the kind having a drivable digging wheel, supported on 10 top of the digging wheel, and this shaft is driven through
a suitable transmission 15, 16 from the tractor power
a transverse horizontal axis, provided peripherally with
take-off shaftyand drives a pinion meshing with an in
digging tools which each comprise a ?at root portion
ternally-toothed wheel fast within the periphery of the
secured to the wheel with its plane parallel to the plane
digging wheel at the far side in FIGURE 1.
of rotation of the latter, and a laterally-extending, ?at,
operative portion, and the object of the invention is to 15 The digging wheel has a radially-directed peripheral
?ange 17 to which the longer legs 18 of a circumferential
divert to one side of the machine such of the soil, lifted
arrangement of substantially L-shaped tools are ?atly
by the digging wheel during the digging operation, as is
secured, and the other legs 19 of these tools extend later
entrained by the radially-inner surfaces of the operative
ally at an appropriate rake angle for cutting and lifting
portions of the tool and the digging wheel. The word
It- is found in‘
“entrained” is used herein to cover the case where the 20 the earth for the digging ofrthertrench.
that the
earth actually adheres to the parts in question and the
earth being dug adheres to, or is carried round by the
case where the earth is carried round without adhering
to them.
tools and digging wheel, the earth being particularly prone,
to adhere to those sides of the tool legs 19 which are
According to the invention a trench digging machine,
of the kind set forth, includes a drivable rotary member, 25 nearer the axis of the wheel, and in the angles between
the legs 19 and the adjacent face of the wheel.
supported so as not to rotate bodily with the digging
The structure as thus far described does not form part
wheel, having its rotational axis normal to a plane con
of the invention, and-has been included only for the pur
taining the axis of the digging wheel and arranged, at the
pose of assisting in a comprehension thereof.
side of the digging wheel towards which the operative
A bracket 20 fast with the frame 11 supports an up
portions of the tools extend, to work close up to the ad 30
tube 21 within which is a shaft 22 connected to be
jacent side of the digging wheel, and to the radially-inner
driven at the top by angle gearing within a casing 23, fast
sides of the said operative portions of the digging tools
with the tube 21, from a universally-jointed telescopically
without being in their path so as, during the respective
extensible shaft 24. The latter is driven from the trans
rotations-of the digging wheel and rotary member, ‘to
divert to one‘ side‘o'f the machine the earth entrained by 35 verse shaft in tubularcasing 14 by worm gearing within
a casing 25 mounted on the casing 14.
the said radially inner’ ‘sides of‘ the said operative portions
Adjacent the lower end of the vertical shaft 22 is a
and the digging wheel during the digging of a trench.
disc 26 having, on its upper surface four outward
The rotary member can have a peripheral arrangement
ly-extending ?ngers of which the outer ends, when the
of ?ngers for removing the raised earth, and it can, ac
cording to a further feature, be associated with a de?ector 40 disc is rotated, have a path bringing them closely adja
cent the radially-inner sides of the legs 19 of the digging
plate which is arcuate about the tips of the ?ngers and
tools and close to the adjacent side surface of the digging
serves to divert the removed earth to one side of the
wheel 10. Each of these ?ngers, as shown in FIGURE 3,
has a straight portion 27 contiguous with a forwardly
Preferably the drives for the digging wheel and rotary
member are derived from a common source such, for in
stance, as from a power take-off shaft of a tractor to which
the machine is attached, or from a driven shaft of the
bent, straight operative portion 28 and each comprises
a main strip of metal formed as aforesaid and backed
by a reinforcing strip 29 of which the outer end is curved
to support the inner end of the forwardly-bent operative
digging machine if the latter is adapted to be self-pro
portion but does not extend to the outer end of the latter.
pelled, but as the rotary member is clear of the digging
For supporting each of the ?ngers 27, 28 the upper face
tools any need for driving the digging wheel and rotary 50
of the disc 26 is provided with four equi-circumferential
member in timed relationship is avoided.
A stationary scraper may be provided for scraping ad
hered earth from the digging wheel.
In the accompanying drawings:
ly-spaced, rectangular mounting blocks 30 which are
welded in position with their major dimensions directed
along a chord of the disc so that the major dimension of
FIGURE 1 is a diagrammatic rear perspective view of 55 each block is at right-angles to those of the blocks which
cyclically precede and succeed it.
a trench digging machine of the kind set forth attached
Each ?nger has its inner end secured by a bolt 31 to
to the rear of a tractor having a power take-off shaft to
provide the power for operating the machine, which latter
the associated block 30, and it extends outwardly through
a bridge-like member 32 welded to the disc and the
is shown in a raised position;
mounting block 30 for the adjacent ?nger. The members
FIGURE 2 is a side elevation, looking in the direction 60 32 provide clearance for resilient bending of the ?ngers
of the arrow “2” in FIGURE 1, of an upper portion of
about their anchored inner ends, but serve as stops to
the digging wheel and one form of means in accordance
limit that bending to a safe value.
with the invention, drawn to a larger scale, the ?gure also
It will be seen from FIGURE 2 that the disc 26 is held
showing a de?ector plate and a stationary scraper not
up to a shoulder on shaft 22 by a spring 34 held in posi
shown in FIGURE 1;
65 tion by a nut 35 and locknut 36 engaged on a screw
threaded lower extension of the shaft. This allows the
disc to be displaced resiliently in the downward direction
if the ?ngers 28 encounter large clods adhered under the
FIGURE 4 is a detail view in the direction of the
tools 18, 19. Also from the same ?gure it will be seen
arrow “4” in FIGURE 3;
70 that the leading edge of each tool leg 19 is provided with
FIGURE 5 is an enlarged view of the de?ector plate
a somewhat outwardly-directed wear resistant tip 19a
and stationary scraper, shown in FIGURE 3; and
FIGURE 3 is a section on the line 3—3 of FIGURE 2
and drawn to the same scale;
which, shown in FIGURE 3, is of greater width than
the limb 19.
FIGURE 3 also shows at 37 screws for
holding the'tool legsv 18' ?atly against‘ the wheel ?ange
In operation the digging wheel is rotated in the direc
tion indicated by the arrow 38in FIGURE 3, and the
disc 26 in the direction indicated by the arrow 39. The
adjacent portions of their peripheries therefore move in
the planes of their root portions parallel to the plane of
rotation of said digging wheel and with their operative
portions extending at one side of said digging Wheel, a
rotary member at the side of said digging wheel to which
the operative portions of said digging tools extend, said
vrotary member supported from said frame with its rota
tional axis normal to a plane containing the axis of the
digging wheel, said rotary member provided peripherally
the same direction,‘ but it is arranged for the peripheral
with outwardly extending ?ngers having-tips, a de?ector
speed of the tips-of the ?ngers 28, which sweep the circle 10 plate over which said tips move supported from said
ztit-to be greater than that of the'?ange 17' so that the/tips
frame, said de?ector plate having an upstanding wall
of‘ the‘ ?ngers will overtake the tools‘ 18, 19. In doing
this the ?ngers 28 sweep closely- into the angle between
the tool legs 19‘ and the face of the ?ange 17 so as to
arcuate about said tips of said ?ngers, and means adapted
to drive said digging wheel and rotary member, said
rotary member arranged for tips of said ?ngers to work
dislodge earth‘ adhering in the angles. This dislodged 15 clear of but close up to said digging wheel and to those
earth is carried by’ the ?ngers 28 up to a de?ector plate
41‘ which'is of greater height than the said ?ngers and
sides of the operative portions" of said digging tools which
diverts the earth to one side of'the machine.
as, during the respective rotations of the digging wheel
The de
?ector plate is~welded at 42 to a plate 43' which is sup
ported from‘parts 44 and45 (see FIGURE 1') of the ma
chine frame by bolts 46.
Preferably the plate 43 supports‘ a stationary scraper
for removing earth from the flange 17. This scraper is
carried by‘a plate 47 which lies ?atly on plate 43 and
is held‘in an adjusted position by screws 48’ extending
through slots 49.
The scraper comprises a stationary
plate'50‘fast with the plate 47 and strutted' at 51, and‘
it'actsi as- a support-for a holder 52 for a'scraping tool
53. Screws 54 in the plate 50 engage slots 55 in'the tool
holder, and the latter similarly-supports the tool by screws
56 and slots 57. Preferably the tool has a renewable
scraper‘ member 58;
What I claim as my invention and-‘desire to ‘secure by‘
Letters Patent ofthe United States is:
A trench digging machine comprising a frame, a digging
wheel journalled on a transverse horizontal axis in said;
frame, a plurality'of digging tools each'having a ?at‘root
are presented towards the axis of said digging wheel so
and rotary member, to divert to one side of the machine
the earth entrained by the digging wheel and said sides
of said operative portions‘of said tools during the digging
of a trench, a scraper element adjacent the entrance end‘
of‘said de?ector plate, a mounting plate for said scraper
element, means to adjustably position the mounting plate
on said de?ector plate, and said de?ector arranged to
divert the earth from said?nger's'to the side of said ma
chine from'which said‘ operative portions of'said digging
tools extend‘
References Qited‘in the ?le of this‘ patent
portion‘and'a' laterally-extending flat operative portion,
said’digging tools secured by their root portions to said"
digging wheel-in circumferentially-spaced‘positions with
Plumb _______ .__-_ ____ __ Sept; 9, 1879
Radestock‘ ____; ____ _‘__- Mar. 17, 1959‘
Frick _______________ __ June 30, 1959
Hunter‘ _____________ __ Apr. 19, 1961
Great Britain ________ __ Sept. 14_, 1945,
Great Britain ________ __ Jan. 23', 1948
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