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Патент USA US3099952

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Aug. 6, 1963
Filed April 21, 1960
2 Sheets-Sheet .1
Garza/1i Lelsl‘er
Aug- 6, 1963
Filed April 21, 1960
2 Sheets-Sheet 2
United States, Patent 0 ’
Gerhard Leister, Silixen, Lippe, Germany, assignor to
Firma ABG-Werke Gesellschaft mit beschriinktcr Haf
tung, Hameln (Weser), Germany
Filed Apr. 21, 1960, Ser. No. 23,806
Claims priority, application Germany Apr. 25, 1959
1 Claim. (Cl. 94-—50)
Patented Aug. 6, 1963
The lateral displacement of the selected roller units
be effected in a variety of ways; the amount of force
necessary {for the operation can be considerably reduced
if the roller unit is displaced whilst the machine travels at
a low speed so that the roller unit performs a slow rolling
The movement itself can be based on a simple displace
ment iof the roller unit in a lateral direction, but a solu
tion is considered preferable in which the roller unit con
cerned is so supported that it can rotate in both directions
The invention relates to rollers for road construction 10 about a ?xed point in the roller ‘frame. The parallel
having at least two roller units of equal or different rolling
movement of the roller body can then be obtained either
width arranged in tandem.
by means of the steering linkage or by an automatic steer
In such road rollers the individual roller units may
ing mechanism.
consist of a single roller body or may be formed by a pair
The invention will now be described in greater detail
of roller bodies.
with reference to the accompanying drawings showing the
The principle on which the invention is based is that of
invention applied to a three~wheel road roller of usual
releasing at least one of the roller units from its ?xed
design, and in which:
connection with the roller supporting frame and the
FIGURE 1 shows the three-wheel road roller in side
essence of the invention is an arrangement in which at
least one of the roller units is so mounted that it is capable‘
FIGURE 2 is a plan thereof.
of lateral movement with respect to the central position
The construction of the three-wheel road roller shown
on the roller supporting frame.
in the drawings includes two rear roller bodies 1 and a
This basic principle of the invention opens up novel
steering roller 2 in front; the motive power being provided
applications for the various types of road rollers. If this
in the usual manner by the engine 3 which drives the rear
principle of the invention is for example applied to tandem
roller bodies 1 through the gear box 4. The rear portion
rollers, it becomes possible to operate such rollers at will
of the roller frame forms the driving cab 5.
either with the rollers being aligned one behind the other
The front steering roller 2 is so supported that it can
or, by virtue of the lateral displacement of one of the
swing sideways about a pivot 6 which consists of a pin or
roller bodies, with the roller bodies laterally displaced with
similar component rigidly connected to the frame of the
respect to each other thereby enlarging the rolling width 30 machine. To provide this sideways swinging movement
to twice the rolling width compared with that of the con
there is provided a double-ended lever 7 having a bush 8
ventional tandem roller. In other words, the practical
in front in which is rotatably supported the pin ‘9 of the
application of the principle of the invention makes it
steering bracket 10 of the steering roller 2. The rear end
possible to increase the effective width of conventional
of the lever 7 is actuated by a hydraulic ‘drive consisting
types of rollers, in the limiting case to twice the normal
of a ?xed piston rod 11 supporting a movable cylinder 12;
It is Well known that three-wheel rollers, having a rela
tively narrow steering roller in front and a pair of rear
a fork 13 at the rear end of the lever embracing a pin
14 on the outside of the cylinder.
roller bodies overlapping the paths of the sides of the
steering roller, suffer from the disadvantage that in the
the movements of which are transmitted to the pin 9
through a steering rod 16, bevel gearing 17, worm 18, re
presence of obstructions at the sides-such as for example
The steering roller is controlled by the handwheel 15
duction gearing 19, 20, reversing idler 21 and gear wheel
22 integral with the pin 9. The advantage of this gear
over by the wider rear roller unit only, so that the road
wheel transmission is the fact that when the steering roller
metal is consolidated to ‘a different degree, i.e. to a lesser
2 is moved laterally until it reaches its extreme position
extent in the edge portions than in those portions driven 45 indicated at 23 in FIGURE 2 and in which it is ?ush with
curb stones—the edge portion of the road surface is rolled
over by both roller units. This difference in the amount
of consolidation of the road surface becomes particularly
noticeable if the front steering roller operates as a vibra
tion roller so that the edge strips will not be acted upon
at all by roller vibrations. If in the case of such a three 50
wheel roller the steering roller at the front were so
arranged that it could be moved laterally with respect to
the rest of the machine so that its side face could be
aligned ?ush with that of the rear roller, it would become
the rear roller body 1, and parallel to the rear roller bodies
1; it is possible to give the steering roller a slightly inclined
position by means of the handwheel 15, which makes the
lateral movement of the roller easier.
In the embodiment shown on the drawings, the steering
roller 2 can be vibrated by means of a hydraulic motor 24
mounted on the roller frame and which is supplied with
oil under pressure by a pump (not shown) through the
possible with such ‘a roller also to subject the edge por 55 pipes 25 and drives an out-of~balance shaft 27 by means
of a belt 26.
tion to the vibrations of the steering roller. It would thus
To e?ect lateral movement of the steering roller, suit
become possible to subject the entire road surface as far
able control mechanisms (not shown) are preferably pro
as its side boundaries, i.e. including the edge portions, to
vided in the driving cab for actuating the hydraulic drive
a uniform consolidation.
of the lever 7 to the right or left as required. The hy
The two examples quoted above show that the principle
draulic drive can be supplied if desired, by the same oil
of lateral displacement of at least one of the roller units
in the case of road rollers having a number of roller units
arranged in tandem enables the road roller to be adapted
largely to the site requirements in ‘any particular case.
pump as that which supplies the motor 24, or it can be
driven by a separate oil pump which in turn is driven by
the engine 3.
In order to reduce the vibrations of the steering roller
2 with respect to the frame of the machine, the roller body
may be provided with the usual ?exible supports as indi
tive to the direct-ion of movement of the power roller and
means are provided connected to the bracket and the
vertical axle to maintain the front roller parallel to the
rear rollers relative to the rotary axes of the rollers, and
cated at 28.
The present invention can be applied ‘both in connection
with purely static and with vibration rollers, and also with
rollers in which vibrating and non-vibrating roller ‘bodies
means to rotate the steering bracket on its lever arm
to steer the front roller relative to the frame, said means
connected to the bracket and the vertical axle including a
are combined within one road roller. In such case, it may
plurality of interconnected gear wheels mounted on the
be convenient to arrange either the vibrating roller :body
pin, the vertical axle and the lever arm.
or the non-vibrating roller for lateral displacement.
What I claim is:
References Cited in the ?le of this patent
A three-wheel power roller for street and road work
comprising a frame, a pair of rear rollers mounted on the
frame, a single front roller which is a steering roller, the
width of the steering roller being narrower than the dis
tance between the outer edges of the rear rollers, a steering 15
bracket ‘for the front roller and mounted on ‘a pin, a lever
arm connected at one end to said pin so that said bracket
will swing with the front roller on the arm, said arm being
pivotally supported on a vertical axle in the frame and
between the ends of the arm, hydraulic means connected
to the other end of the lever arm to swing the latter
around its vertical axle and the front roller around its
pivotal support as a unit to adjust the front roller laterally
to align ?ush with one of the edges of the rear rollers rela
Huntley _____________ __ Nov. 10, 1931
Hamm _- _______________ __ Oct. 4, 1938
Ross __________________ Dec. 24, 1940
Henneuse ____________ __ Apr. 17, 1945
Wills -2 ________ -n _____ __ Oct. 2, 1945
Wright _______________ __ Ian. 10,
Brown et a1 _____________ _, June 5,
Andersson _____________ __ Feb. 17,
Hamilton ____________ __ May 31,
Williamson __- ________ __ Sept. 27, 1960
France ______________ __ Sept. 12, 1949
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