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Патент USA US3088241

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May 7, 1963
3,088,231
E. H. MORGAN
CONCRETE CURB FINAL GRADE MACHINE
Filed Nov. 6. 1961
2 Sheets-Sheet 1
INVENTOR.
gag/41mg KQYWLWM/
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ATTORNEY
May 7, 1963
3,088,231
E. H. MORGAN
CONCRETE CURB FINAL GRADE MACHINE
2 Sheets-Sheet 2
Filed NOV. 6, 1961
_ _l_____._.____________
‘
INVENTOR.
?aw-MY HQhW/QK
BY
-
-
1
ATTORNEY
United States Patent 0 " "Ice
1
3,088,231
CONCRETE CURB FINAL GRADE MACHINE
Edward H. Morgan, 117 E. 51st St., Savannah, Ga.
Filed Nov. 6, 1961, Ser. No. 150,563
6 Claims. (Cl. 37-108)
3,®88,23=l
Patented May 7., 1963
2
?anged, and they ride on the ?anged tops of the forms
A, B. Because the two forms are of different heights, the
wheels 4 at one side of the carriage are set higher than the
wheels at the other side, in order that the top of the car
riage, formed by the plane of the side members 1, 1, may
constitute a horizontal bed for mounting a ‘gasoline engine
and suitable transmission mechanism as will presently be
described. For this purpose each ‘of the two pairs of
and more particularly it provides a new and useful con
pedestals 3, the pair at the front end of the machine shown
crete curb ?nal grade machine.
In the constructionof roads and streets of poured con 10 at the right in FIGS. \1 and 2,'and the pair at the rear end,
is provided with two vertically spaced superposed horizon
crete it is customary to ?x steel for-ms along each side edge
tal axles 5, 6, as best shown inFIGS. 1 and 3. These
of the strip that is to be paved preparatory to pouring the
axles are journaled in appropriate bearings 7, 7 mounted
concrete to form the curbing and gutter. These forms
on the inner faces of the pedestals. The lower axle 5
are elongated steel members top-?anged ‘for rigidity and
set in ?xed position on the previously graded earth. They 15 projects through the pedestal 3 at one side of the carriage
and has its wheel 4 splined onto its protruding end, and
are generally spaced about twelve inches apart in accurate
The present invention relates to roadbuilding apparatus
parallelism, with the un?anged side surfaces internally
opposed and the top ?anges extending oppositely out
wardly. In a typical installation, one of the forms is
twelve inches high and the other six inches high. It has
been customary heretofore for the earth between the .two
the upper axle 6 similarly projects through the pedestal 3
at the other side of the carriage and has its Wheel 4
splined onto its protruding end. This arrangement is
duplicated at each end of the carriage, as shown in FIG. 1.
In an intermediate portion of the carriage, between the
front and rear sets of wheels 4, the machine is provided
with a rotary cutter 8 of special form. In the illustrated
embodiment of the invention this cutter has two diametri
forms to be ?nally graded by hand labor using shovels.
The object of the present invention is to mechanize this
?nal grading operation by providing a machine that will
propel itself along the forms and accurately loosen earth 25 cally opposed radial blades 9, 9, each spirally curved, and
respectively equipped at their outer ends with replaceable
from between them to the desired depth, which is the plane
sets of hardened teeth members and cutting edges 14}.
of the bottom edges of the forms, and remove all such
The rotary cutter is mounted on a shaft 11 which is
loosened earth, thereby leaving the space between the
journaled in bearings 12, '12 carried by the inner and outer
forms clean and fully and ?nally graded, ready for the
30 sides of a housing 13 formed of stout steel plates depend
concrete pouring operation.
ing rigidly from the frame member 1 at the side of the
This object is accomplished by providing a wheeled car
carriage above the lower wheel 4. The cutter 8 is thus
riage, motor driven along the forms, and equipped with
positioned for rotation in the transverse center of the
earth removing means comprising the combination of
rotary power cutter blades and a stationary scraping as
sembly cooperating with the rotary cutter to insure com
plete removal of all the earth ‘from between the forms by
pushing forward, into engagement with the cutter, all the
earth loosened by the cutter, -so that continued rotation
'of the cutter ‘will be effective to remove all such earth by
throwing it to one side, over the adjacent form.
An embodiment of ‘the invention that has been thor
oughly tested in actual service and found to be entirely
satisfactory, and which is accordingly at present preferred,
is illustrated in the accompanying drawings forming part
of this application for Letters Patent, in which
FIGURE 1 is a side elevational view of the machine,
mounted in place in operative position on a pair of curb
ing and gutter forms;
FIG. 2 is a top plan view of the FIG. 1 showing;
FIG. 3 is a front end elevational view of the machine;
and
machine so that its blades span the major portion of the
space between the forms A, B and the outer ends of the
blades will describe a path, when the cutter is rotated, that
will extend down to substantially the plane of the bottom
edges of ‘the forms. It will be apparent that when the
cutter is rotated its teeth and cutting edge It} will dig the
earth between the forms A, B and loosen it throughout the
space between the forms to substantially the depth of the
forms.
To drive the rotary cutter, and at the same time propel
the carriage along the forms, a gasoline engine 14 is pro
vided. In the illustrated embodiment of the invention this
is a one and one-half horsepower single cylinder four
cycle engine which is mounted on a bed 15 at the for
ward end of the carriage, above the front wheels 4. The
engine is equipped with the usual clutch and gear box 16,
mounted on one of the side frame members 1 and driven
by a belt 17 from the engine crankshaft and sprocketed by
the chain 18 to a jackshaft 19 extending transversely of
the carriage frame and journaled in bearings 29, .20 on
4—4 of FIG. 1,‘looking rearwardly, in the direction of
the frame side members 1. A sprocket is splined on this
55
the arrows.
jackshaft
and connected by a chain 21 to the axle 6 of
In these drawings the reference characters A, B desig
the forward high wheel 4, and a chain'22 is trained around
nate respectively'the'high and low'steel forms that have
sprockets of identical size fast on the axle 6 and the lower
‘been erected inparallelism along one of the side edges of
axle 5, of the forward lower wheel 4. Thus the engine
a roadway under construct-ion. In a typical operation
drives the two forward axles 5, 6 at the same rate. It is
such as has been 'selectedin this application to illustrate
convenient to so proportion the sprockets and their ratios
the invention, the form A is twelve inches high, the lower
as to cause the carriage to vbe propelled along the forms
form B is six inches high, and the two are spaced twelve
at a speed of some live feet per minute.
inches apart. Both are outwardly ?anged at the top, as
The engine also drives the rotary cutter 8, and this is
shown. The space between them is to be completely
accomplished by a chain 23 sprocketed from the jack
cleared of earth preparatory to a concrete pouring opera
shaft 19 to a stub shaft 24 which is journaled in the upper
tion.
part of the vertical compartment or housing 13, directly
The machine provided by the invention comprises a
above the cutter shaft 11. This shaft is connected by a
generally oblong carriage made up of a pair of stout angle
chain 25 with the stub shaft. These sprockets are so
iron side members 1, 1 and cross pieces 2, 2 welded or
proportioned that the cutter rotates at approximately 180
equivalently integrated into a rigid framework having 70 rpm. when the carriage is advancing at normal speed.
front and rear depending pedestals 3, 3 journaling sup
The frame is extended at each of its ends vby a pair of
porting and traction wheels 4, 4. These wheels are
FIG. 4 is a transverse sectional view taken on the line
3,088,231
3
handles 26, each welded to one of the frame side mem
solid combination of blade, packed earth and shroud
and will become engaged with the cutter blades rising in
front of the shroud. Thus all the earth is eifectively
loosened and discharged from between the forms and the
?nal grading of the gutter and curbing is completed by a
ing handle, as conventionally depicted at 27, connected
single pass of the machine.
by suitable linkage, not shown, with the gas engine and
It is to be understood that various details of the
its clutch mechanism.
exemplary embodiment of the invention herein described
It will be evident from the foregoing that when the
may be altered within the broad spirit of the invention as
engine is operating and the clutch is engaged, the carriage 10 de?ned
by the more broadly worded of the appended
will be propelled along the forms in the direction of the
claims.
arrow in FIG. 2, and the rotary cutter, turning in the
I claim:
direction of movement of the carriage, as indicated by the
1. In a concrete curb ?nal grading machine, a car
arrow in FIG. 1, will dig and loosen the earth between
riage having supporting and traction wheels adapted to
the forms to produce the desired ?nally graded trench. 15 travel on elongated laterally spaced parallel steel forms, a
The loosened earth will be in large part thrown up by
rotary cutter journaled in the carriage and having spirally
the rotating blades of the cutter and because of the spiral
curved blades, 2. motor mounted ‘on the carriage driving
curvature of those blades will ‘be discharged over the
the traction wheels to propel the carriage along the forms
lower form B.
and driving the cutter to loosen the earth between the
It has been found, however, that this action is not 20 forms and dig a trench by throwing the loosened earth up
entirely reliable and that it is not practical to design a
and over one of the forms, a shroud carried by the car
rotary cutter that will make accurately squared contact
riage behind the cutter adapted to scrape the ‘bottom of
with the inner surfaces of the forms and dig to the flat
the trench formed by the cutter and engage loosened
plane which is to constitute the graded bottom of the
earth escaping a cutter blade and push the same forward
trench.
25 for discharge from the trench upon re-engagement by
An important object of the invention is to equip the
the cutter, and a ?xed scraper blade extending trans
machine thus far described with means for perfecting this
versely
across the machine directly behind the shroud and
earth removing function by insuring complete loosening
having an edge at its bottom adapted to scrape the bottom
of all the earth between the forms, down to the plane of
of the trench.
the bottom edges of the forms, and causing all such 30
2. The machine claimed in claim 1 in which the shroud
loosened earth to be removed by the rotary cutter.
comprises a stilf plate curved at substantially the radius
This is accomplished by the combination of a ?xed
of the rotary cutter and having its concave surface dis
scraper blade 28 of a heavy steel plate rigidly mounted
posed closely adjacent a portion of the path traversed by
behind the rotary cutter and a curved shroud device 29
the edges of the cutter blades.’
similarly ?xed in the framework between the blade 28 35
3. The machine claimed in claim 1 in which the shroud
and the rotary cutter. The blade 28 spans the space be
includes a ?exible leather-like sheet disposed with its
tween the forms, and it has a forwardly turned cutting
side edges disposed in position for wiping engagement
bers 1. These are useful in lifting the carriage into ‘and
out of operative position on the forms. One or both of
the handles at the rear end of the carriage may have
mounted thereon a control throttle and clutch operat
edge along its bottom that effectively scrapes the bottom
of the trench and leaves no loose earth behind it.
The
with the forms.
7
'
i
4. The machine claimed in claim 2 in combination
shroud device 29 comprises a steel plate 30 which is 40 with
a ?exible leather-like sheet backing the shroud plate
curved to conform to the path through which the edges
and
having
its side edges disposed in position for wiping
of the rotary cutter blades move and is set close to that
engagement with the forms.
path. Behind the plate 30 is a sheet 31 of heavy leather
5. The machine claimed in claim 1 in which the shroud
of the kind used in transmission belting. This is riveted
comprises
a stiff plate curved at substantially the radius
or otherwise securely attached to the back of the plate 45 of
the
rotary
cutter and having its ‘concave surface dis
30 and is proportioned to wipe with its edges the inner
‘posed closely adjacent a portion of the path traversed
surfaces of the forms and the bottom of the trench.
by the edges of the cutter blades.
As the carriage moves along the forms, the earth that
6. The machine claimed in claim 1 in which the shroud
is loosened by the rotary cutter 8 and escapes being thrown
out of the trench by the rapidly turning blades is caught 50 comprises the combination of a stiif plate curved at sub
stantially the radius of the rotary cutter and having its
by the shroud and is thereby pushed forward with the
concave surface disposed closely adjacent a portion of
advance of the carriage so that it becomes re-engaged
the path traversed by the edges of the cutter blades and
with the blades of the cutter and is eventually thrown up
a ?exible leather-like sheet disposed with its side edges
and over the low form B. Such earth as may not have
in position for wiping engagement with the forms.
been cleaned from the trench by the shroud members 30,
31 will be caught and scraped from the trench bottom
by the ?xed blade 28 and will be by this blade pushed
References Cited in the ?le of this patent
forward as the carriage advances. After a period of
UNITED STATES PATENTS >
operation the space between the blade and shroud be_
comes packed with this scraped earth and thereafter the 66 1,684,637
Carr _________________ __ Nov. 8, 1927
trench continues to be scraped clean by the blade and
1,918,842
Franklin _____________ __ July 18, 1933
the earth packed before it, so that all further scrapings
1,956,931
Scullen ______________ __ May 1, 1934
loosened from the trench will be pushed forward by the
2,837,842
Jackson ____________ __ June 10, 1958
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