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Патент USA US3035504

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May 22, 1952
c. DOMENIGHETTI
3,035,499
FINISHER FOR LAYING AND TAMPING BITUMINOUS
CONGLOMERATES OVER ROAD PAVINGS
Filed March 7. 1955
2 Sheets-Sheet l
May 22, 1962
c. DOMENIGHETTI
3,035,499
FINISHER FOR LAYING AND TAMPING BITUMINOUS
CONGLOMERATES OVER ROAD PAVINGS
Filed March 7. 1955
2 Sheets-Sheet 2
.“F/
50.5
United States Patent (‘)?tice
3,035,499
Patented May 22, 1962
2
1
with the three groups inserted into each other for opera
3,035,4§9
.
FINISHER FOR LAYING AND TAMPING BITUMI
NOUS CONGLOMERATES OVER ROAD PAVINGS
Costante Domenighetti, Piazzale Giulio Cesare 20,
Milan, Italy
Filed Mar. 7, 1955, Ser. No. 492,334
Claims priority, application Italy Mar. 13, 1954
5 Claims. (Cl. 94—46)
The present invention relates to machines for laying
and tamping bituminous conglomerates over road pavings.
More particularly the present invention is concerned with
tion;
FIG. 5 is a side view of a modi?ed construction;
FIG. 6 is a plan view of the structure of FIG. 5; and
FIG. 7 is a partial perspective view illustrating addi
tional side parts completing and adjustably extending the
vibrating blade.
The vibro-?nisher of the invention for bituminous con
glomerate road mats comprises three groups A—B—C
(FIG. 1), which in operating condition are rigidly con
nected (FIG. 4) to form a single unit and partly ?t into
each other in a predetermined relationship which con
stitutes a characteristic feature of the invention and pro
predetermined cross section.
vides for an optimum distribution of the conglomerate.
In FIG. 1, the groups are shown in perspective view
In accordance with the invention, a machine comprises 15
very diagrammatically and set apart from each other in
the combination of three groups of units assembled to
gether, but separable. The ?rst group comprises a frame
order to indicate each one’s functions better. It should
be understood that for the sake of clarity all the con
formed by two longitudinal side slides bearing upon the
structive details of the machine have been purposely
ground and carrying two or more cross vibrating blades,
omitted and that the purpose of FIG. 1 is merely to show
the second comprises a crawler type tractor whose tread
is such as to permit its entering between the fore portions
the main function of the three groups.
Group A consists of two slides 1 interconnected by
of said slides, and the third comprises a hopper connect
a strong frame 14 upon which are transversely mounted
able with one of the two preceding groups and provided
the two vibrating blades 2. In this representation of
with a wall having its lower end adjustable in height.
group A, the vibrating means is omitted. The position
An object of the present invention is to provide a ma
of the blades is adjustable by means of handwheels 3
chine which lays thin conglomerate mats of ‘the order of
about 15 mm. It has been observed through experience
which act upon screws 13 (FIG. 3), which screws are
three in number. Two of these screws vare arranged vat the
that a stilt metal blade does not easily ride over irregu
outer ends of the blades and one of thescrews is between
larities. Actual trials have revealed that a substantial
the inner ends of the blades 2, thus permitting a variation
advantage is gained by replacing the still blade or a
in the road pro?le according to the diiferent requirements
portion of it with ‘a rubber blade, interchangeable with
of the road surfaces. The function of slides 1 is to sup
the still metal blade, so that it will be possible, as a result
port blades 2, and to maintain them at the right level.
of a quick substitution, to carry out work previously
A preferred Way for setting the blades 2 into vibration
deemed almost impossible.
It was found, during the operation of laying machines, ' and adjusting their position is represented in FIG. 3 and
will be discussed subsequently.
that the so called coarse ?rst adjustment of the hopper,
It will be appreciated that the three adjusting screws
when it was a question of laying very limited quantities
13 can be operated simultaneously so as to cause the
of material, was not su?iciently close and exact. It was
blades 2 to lift or lower together, or else they can be
found expedient to so arrange closure plates for the
a machine to form a smooth and compact mat having a
hopper outlet, which plates may also be disposed alter
nately, so as to let the material fall in the form of longi
tudinal strips instead of a continuous and uniform mat
or layer. The closure plates have lower extensions guid
ing ‘the material until the material is almost in contact
with the road.
Lastly, in order to reduce the width of the mat to be
laid a supporting cross piece has been provided, carrying
40 singly actuated or two of the blades can be actuated to‘
gether, so as to cause the lower or outer edge of the blades
to assume relatively different positions. This provides for
the laying of the bitmuminous conglomerate in the form
of a crown, a V or a flat horizontal surface.
It should
be understood that the screws 13 are adjusted in advance,
for instance, before starting the laying of conglomerate
on a curve or turn where, as it is known, the outer portion
must be higher than the inner portion to obtain the proper
banking of the roadway. This adjustment is carried out
In order to reduce the ‘overall dimensions of the 50 only where it is necessary to vary the shape of the roadway
in accordance with requirements. When the blades 2 are
?nisher while still leaving it almost entirely assembled, it
vertical and longitudinally disposed walls or partitions
touching the ground and con?ning the material laterally.
vertically vibrated, the material deposited between the
has been considered, according to the present invention,
tracks 4 is spread out, tamped and is at the same time
to render the‘ fore and side walls of the hopper swingable,
struck oif at the desired height which is set by means of
so that they may be folded upwards and side ways for
the adjusting screws 13. As the slides 1 bear on the road
transportation, thus permitting a reduction in the width
base, and not on the deposited conglomerate, it will be
of the machine by the amount necessary to make it capa
clear that this adjustment by means of screws 13 is very
ble of ‘travel upon roads, and to mount upon a single truck
accurate.
the whole machine, without having to disassemble it.
The slides 1 are made of two pieces which are hinged
The annexed drawings schematically show by way of
together ‘by means of a vertical hinge 23 so as to present
example the various embodiments of the invention.
60
a tail 1’ which can be swung to one side. During opera
FIG. 1 shows a perspective view separately and very
tion, tail 1’ is kept in an ‘aligned position with the other
diagrammatically of the three groups constituting the
portion 1 by means of diagonal tie rods 22. The articu
major portions of the machine according to the invention,
lation or vertical hinge 23 allows the swinging of the
wherein for the sake of clarity all details pertaining to
tails 1’ against the portions 1 after the diagonal tie rods
65
the blades have been omitted;
22 are freed in order to reduce the length of the slides
FIG. 2 shows in a longitudinal section a diagram of
during transportation. The conglomerate which is depos
the machine operation;
ited between the tracks ‘is spread out by the operation of ‘
FIG. 3 represents in a vertical section and on an en
blades 2.
larged scale a vertical section of a vibrating blade for
The length of the slides 1 when lengthened with the
70 tails 1’ is such that the blade is not affected in the least
the structure of FIG. 1;
by the undulations or irregularities of the road base in
FIG. 4 is a plan view of the assembled machine, i.e.
3,035,499
4
the longitudinal direction. In practice, the complete length
>11 is the same as the width of the bottom or outlet open=
is about 2.50 to 2.80 meters.
ing of the same and is not funnel-shaped as in the conven
This system of ?nishing and striking off, by means of
transverse vibrating blades mounted upon long longi
tudinal slides bearing upon the ground, ful?lls the most
modern concepts and constitutes an improvement and an
advantageous feature with respect to other known ma
chines, the height of the blades being referred to the pre
tional machines of this type, which therefore require con
veying screws to spread out the material to the sides.
F ur
thermore, the width of the hopper 11 is almost the same
as that of the tracks or crawlers 4 so that, when in work
ing position, the whole group C may be longitudinally
inserted between the front half portion of the crawlers 4
laid conglomerate and not to the slide bearing plane in
occupying the whole distance therebetween. Group C
the known machines. In the known machines it often 10 is connected to group B by links 11a. The conglomerate
happens that during the striking o? of the vibrating blade,
falling from the bottom of the hopper spreads out by it
noticeable resonance oscillations are set up which are
self between the tracks or crawlers 4 and the crawlers be
tween the slides 1 after which it is tamped by the vibrat-v
due to the summing up of undulations of the road base.
FIG. 3 shows a practical way in which the vibrating
ing blades 2-24. As a result of the particular relative
blades can be mounted on the machine and in particular 15 position of the three groups, one with respect to the other,
on group A.
the machine according to the invention is extremely sim
through conventional transmission means and gear re
ple, reliable and inexpensive.
The hopper 11 is provided with apertures the discharge
from which is controlled by shutters or blades 7, arranged
ducing box 16 (FIG. 1) coupled after the group B has
at the rear or downstream wall of the hopper, the blades
been connected with group A by means of bolts or pins
17 and connecting rods 18. The upper or supporting part
7 being actuated by adjusting screws 8 and handwheels 12
and striking off the discharged material at selected height.
Hese blades 7 are provided to regulate the discharge
The vibration is transmitted to the blades 2 by means
of eccentrics 9 which are driven by the main engine
24 of the blades 2 is connected with the corresponding
eccentric 9, which rotates to displace the blade, while the
of the material ‘from the hopper 11, so as to present in
lower part 2 which is the blade proper is formed from a 25 front of the vibrating blades 2-24 of the group A the
stronger material and is replaceable (FIG. 3). Brie?y,
proper or correct quantity of conglomerate to be deposit
the support 24 for the blade and the blade [2 itself will be
ed, struck off, vibrated, tamped and then smoothed out in
hereinafter referred to as a'blade 2-—24. Blades 2-24
order to make a perfect mat. The vibrating blades 2-24
are mounted on the frame 25 so as to be adjustable in
may be heated at their rear portion in any conventional
height, and are retained against the frame 25 by means 30 manner.
of springs 26 anchored on pin 27 to the stationary frame
The schematic operation of the vibrating ?nisher is
14. Said frame 14 is rigidly connected to slides 1 and to
represented in FIG. 2 of the drawing,~in which the arrow
handwheel 3 which actuates screw 13 for lifting and lower
'29 shows the forward direction of running of the machine.
ing the frame 25 carrying the corresponding blade 2-24.
It will be appreciated that the blades 7 of the hopper 11,
The two blades 2-24 are so constructed as to be in 35 controlled through the adjusting screws 8 and handwheels
clinable one with respect to the other and alternatively
-12, exactly regulate the quantity of material deposited in
with respect to the ground. The cross piece 28 ?xed to
front of the vibrating blades 2, whose height is in turn
the movable frame 25 serves as a guide and support for
adjusted with great precision by means of the screws 13
the lower part of the blades 2-24 during their vibratory
and handwheels 3 acting upon the blades.
displacement. During vibration, the lower end of the
It is important to note the manner in which the adjust
blade 2-24 describes an ellipse. As experimentally as
ing of the blades 7 by means of the screws 8 permits the
certained, this permits a very good tamping of the mate
vibrating blades 2-24 to operate, while having in front
rial.
of them the exact quantity of material necessary for ob
The group B can be called a guide and traction group
taining a very good laying of the mat.
and is similar to a Caterpillar crawler tractor. In this
The vibrating motion of the blades 2 vfurther acts in
45
group are two sturdy tracks 4, engine 5, preferably a diesel
such a manner not only as to realize the striking off but
engine, a box 16 containing the reduction gears, a speed
also a tamping of the material, which is very important
box, clutches etc., from which extend the steering control
when the subgrade irregularities are noticeable, in which
levers 6 and the gear box control lever 10‘. This group
case a simple striking o? would lead to the formation of
B with all its accessories constitutes the guide and traction
50 subsequent undulations over the upper mat surface due
group of the machine, which is shown in FIGS. 5 and 6
to the compression exerted by the road rollers and by
too, wherein to simplify the ?gures the crawlers and con
tra?ic.
.
necting cross rod 32 of ‘the groups are only diagrammati~
This machine may be very easily transported on the
cally shown. The bottom of the group B is elevated from
road. The hopper 11 is disconnected while the two
the ground so as to permit the passage of conglomerate
groups A and B remain connected to each other. The
therebeneath.
tails 1' of the slides 1 are swung around about the hinges
The width of slides 1 is almost the same as that of
23 to the sides in order to reduce the length of the two
the crawlers 4. In working position, the group B is longi
groups which are then mounted on a truck and transport
tudinally inserted between the front half portion of ‘the
ed in a direction perpendicular to the operating direction
slides 1 and occupies the entire distance therebetween.
of the ?nisher. The two groups A and B, when connected
Group B is connected to the group A by means of bolt 60 together, reduce the length of these two groups as men
holes 17 (or 17') ?xed to the side of the frame of group
tioned above, and both may be included in a carriage
B and entering a hole 18' of the fore end of the connecting
‘gauge templet (2.50 m.) as required by some road codes.
rod 18, which can accomplish a limited oscillation around
Group C, which is constituted by the hopper 11, is also
the pin 19 ‘as a result of the provision of a large opening 65 mounted on a truck frame and towed either by a separate
20 on each slide 1. The second bolt hole 17’ is provided
vehicle or by the same vehicle transporting groups A and
for varying the distance betwen groups A and B during
B.
It has been found possible to obtain a better surface
the assembling.
distribution of the conglomerate by adopting a vibrating
The group C consists of a large hopper '11 into which
normal dumping trucks can completely discharge while 70 blade 2-24 whose extreme portion 2 is formed of a
?exible and yieldable material, such as, for instance rub
those of a greater capacity can discharge in two opera
ber. To increase the width of the conglomerate addi
tions. The hopper may be very easily and rapidly en
tional blades 30 may ‘further be added, which are detach~
gaged and disengaged from the truck and therefore pro
ably mounted at the sides of the machine (FIG. 6, and in
vides for an enormous saving of labor. As clearly shown
in the ?gures, the width of the inlet opening of the hopper 75 more detail in FIG. 7). These side blades 36‘- are shaped
3,035,499
-
6
tive position of its three units A, B and C, an optimum dis
in the form of a sharp elbow and are ?xed by conventional
pivot 47 with a certain inclination with respect to the
tribution and tamping of the conglomerate is provided
main blade 2—24, to the end of deviating a portion of
the material or conglomerate coming out of the hopper
and carrying it to the exterior of the slides 1 toward the
with the least possible and least expensive means. The
machine therefore o?ers all of the advantages of more
complex and more delicate and higher priced machines
elbow shaped end 30’.
used up to the present for the same work without pre
At end 30' the material or con
senting, however, the disadvantages of requiring expensive
glomerate collects in a heap 45 (FIG. 6) which, passing
maintenance and the possibilities of break-down of the
under the blade 30 which is slightly elevated from the
delicate parts.
ground distributes itself over the ground in a supplemen
\Vhat I claim is:
tary strip 46 widening the surface of the mat. The blades
1. Apparatus comprising: a slide unit, a guide and trac
30, instead of being ?xed, may be displaceable about ver
tion unit having a determinable forward direction of
tical pin 47. With this arrangement the width of the
travel, and a hopper unit, said slide unit comprising
supplementary strip 46 may be varied at will.
spaced slides, a frame connecting said slides, and vi
In another embodiment of the invention, the supple
mentary blades 30 may be pivoted or welded at the point 15 brating blades adjustably supported by said frame and
arranged transversely of said slides, said slides including
52 to the end of the vibrating blade 2—24 and participate
hingeably connected rear extremities, said guide and trac_
to its vibratory movement. Besides, the blades 30 may
tion unit comprising an engine, crawlers coupled to said
also have at their lower ends a rubber portion, as provid
engine and driven thereby, said crawlers being in spaced
ed for the main blade 2—24.
Vertical longitudinal walls or partitions 21 may be dis 20 parallel relation and extending between ‘said slides in
juxtaposition thereto, said hopper unit extending between
placeably and removably mounted upon a supporting
said crawlers and de?ning an outlet opening extending
cross piece 32 by means of slidable brackets or hooks or
therebetween, said hopper unit comprising a blade opera
sleeves 31’ adjustable with respect to the hopper 11, in
tively disposed at the ‘rear of said opening to control the
order to con?ne the conglomerate laterally, thus limiting
height of substance discharged therethrough, means to
the laying within a predetermined width. Horizontal
control the height of said blade, and means for coupling
plates 33 wedged in hopper 11 have also been provided,
said hopper and slide units to said guide and traction unit.
operating as partial covers and disposed over the outlet
2. Apparatus as claimed in claim 1 comprising cover
opening of the hopper 11, for limiting the area of passage
plates in said hopper unit for selectively covering said
of the material as required.
In order to facilitate the transportation of the machine 30 outlet opening to con?ne the discharge therefrom.
3. Apparatus as claimed in claim 1 comprising adjust
on the road, provision has been made to render the walls
ment means in said slide unit for adjusting the transverse
of the hopper 11 swingable, so as not eo exceed the maxi
inclination of the blades in the latter said unit to control
mum overall dimensions allowed by the road code. To
the contour of substances deposited.
this end, the fore part of the side walls 34, of the hopper
4. Apparatus as claimed in claim 1, wherein said
11, ie the part which projects to the front of the ma 35
slides are provided with lateral openings, and auxiliary
blades extending through said openings and pivotally con
chine outside of the crawlers 4, is vertically hinged at
vertical hinges 36 to the back part of the side walls 34.
The back part of the side wall together with the vertical
nected on a vertical axis to said slides.
5. Apparatus as claimed in claim 1 comprising detach
other and are usually supported by the crawlers frame of 40 able ?exible members on the bottom edges of said blades
in said slide unit.
the group B in any conventional manner. The inclined
forecross wall 35 of the hopper is horizontally hinged at
References Cited in the ?le of this patent
hinge 37 so as to be swingable upwards in the direction of
UNITED STATES PATENTS
arrow 40 (FIG. 5) by means of a rope 39 actuated by a
handwheel 38. Once the inclined fore-cross wall 35 has 45 1,532,841
Stayton et al ___________ __ Apr. 7, 1925
been lifted upwards, the fore part of the side Walls 34 may
1,979,619
Hemstreet ____________ __ Nov. 6, 1934
back cross wall or end wall of the hopper are ?xed to each
be swung inside about the vertical hinges 36 so that all
of the parts of the hopper projecting out of the crawlers
are folded in so as to reduce the overall dimensions of
the machine.
If, as shown in FIG. 6, a truck 41 ‘approaches on the
ide to load the hopper, the hopper can be swung for in
stance about a pivot 42 (see dotted lines, hopper 11’)
allowing a 90° rotation in the direction of the arrow 43
(FIG. 6) to get the hopper under the discharge opening 55
of the truck 41 which is no longer in front but at the
side of the machine.
During the rotation, the hopper is entirely supported
on one side by the pivot 42 and is also supported at the
opposite side by either a wheel 44 or a derrick system. 60
During this rotation, of course, the hopper must be en
tirely closed at the bottom with cover plates or shutters
33, which are removable from the outside, either by hand
or mechanical means, and the hopper is swung back to the
working place.
The machine according to the invention is of a simple
and strong construction as a result of the particular rela
65
1,987,398
1,994,437
2,054,436
2,109,020
2,116,468
2,185,645
Gardiner _____________ -1 Jan. 8,
Reis ________________ __ Mar. 12,
Mosel ______________ __ Sept. 15,
Abernathy ___________ __ Feb. 22,
Cost _________________ __ May 3,
Mosel ________________ __ Jan. 2,
1935
1935
1936
1938
1938
1940
2,225,481
2,252,717
2,289,168
2,295,519
2,303,486
Lundbye ____________ __ Dec. 17,
Lundbye ____________ __ Aug. 19,
Barber _______________ __ July 7,
Millikin ______________ __ Sept. '8,
McConnaughay ________ __ Dec. 1,
1940
1941
1942
1942
1942
2,351,592
2,380,435
2,473,961
2,586,396
2,757,587
Barber _______________ __ June 20,
Heltzel ______________ __ July 31,
Mandt et al. __________ __ June 21,
Trampler ____________ __ Feb. 19,
Mentes _______________ __ Aug. 7,
1944
1945
1949'
1952
1956
FOREIGN PATENTS
240,544
21,696
Great Britain __________ __ Oct. 2, 1925
Norway _____________ __ Apr. 15, 1930
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