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Патент USA US2127485

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Aug. 16, 1938.
c. A.’ OWENS ET AL
2,127,485 .
ROAD ROLLER
3 Sheets-Sheet l
Filed Oct. 16, 1956
1%NWMA. TORS
C
Owens.
Fred L. wh/fz
B
Earl /. Beicher:
W,“
ATTORNEYS.
'Aug- 16, 1938-
' c. A. OWENS ET AL
2,127,485
ROAD ROLLER
Filed Oct. 16, 1936
3 Sheets-Sheet 2
4
.
-
’ ‘
)
C/i/N
N TORS
A. Owens.
ATTORNEYS. 2
2,127,485
Patented Aug. 16, 1938
UNITED STATES PATENT OFFICE
2,127,485
ROAD ROLLER
Clifford A. Owens, Fred L. White, and Earl I.
Beicher, Marion, Ohio, assignors to The Osgood
Company, Marion, Ohio, a corporation__ oi.’
Ohio
Application'october 16, 1936, Serial No. 106,002v
14 Claims.
(Cl. 94-—50)
Our invention relates to a road roller. It has
.to do, more particularly, with a road roller of
the ordinary type which is provided with an at
structure when the ironing roller passes over an
incompressible object or high spot.
tachment for effectively ironing out high spots
and irregularities in the road surface being rolled.
A road roller has been provided in the past
with an auxiliary roller adapted to iron out the
irregularities in the road surface. However, this
5
prior art road roller has been possessed of certain
Another object of our invention is to provide
a roller of the'type indicated in the preceding
paragraph wherein means is provided for pre- 5
venting the steering roller or the tractions roll
ers from being moved out of contact with the‘
road surface when the ironing roller passes over
an incompressible object or high spot.
disadvantages. This prior art road roller com
prises two rear rolling wheels, a forward roll
ing wheel or roller of a width greater than the
distance between the inner edges of the rear
rollers, and a small ironing roller which is lo
15 cated intermediate the front and rear rollers.
10
Hydraulic pressure means is provided for forc
ing the ironer roller in contact with the road
surface. The location of the intermediate ironer
roller and the nature thereof results in certain
20 drawbacks. This roller is adjustable into several
positions and several passes over the road sur
face, with the ironer roller set at a different posi
tion during each pass, are necessary toieffec
tively iron out the irregularities in the road sur
25 face. The pressure exerted by the ironer roller
is dependent upon the weight of the entire roller.
There is a tendency when the ironer roller strikes
an incompressible object or high spot, for either
the steering-front roller or the traction rear
80 , rollers to be lifted off the surface. Thus, it is
apparent that the entire weight of the machine
may be exerted on the ironer roller which may
result in‘ too much pressure being applied to the
road surface with the result that the road struc
35 ture may be broken down due to the vexcessive
pressure.
One of the objects of our invention is to pro
vide a road roller of the ordinary type with an
ironer roller which is of such a type that the
40 irregularities in the road surface will be effec
tively ironed out with the result that a very
hind the traction rollers we mount an auxiliary
roller which may be termed van ironing roller.
This roller preferaby is of such a width that it 20
operates over the entire surface previously rolled
by the main rollers provided on the machine.
We preferably provide cylinder and piston mech
anism for causing the ironer roller to exert a
predetermined pressure on the road surface so 25
as to iron out any irregularities thereof. How-‘
ever, in order to eliminate any danger of too ,
much pressure being exerted on the road surface
by the ironer roller, which might cause break- -
ing down of the road surface, we provide a 30
compensating cylinder which may be set to limit
the pressure exerted by the ironing roller to a
predetermined maximum. If the ironing roller
passes over an incompressible object or high spot
tending to lift the rear traction rollers from the 35
surface, this compensating cylinder will auto
matically'operate to prevent lifting of the trac
tion rollers from the road surface.
The preferred embodiment of our invention is
illustrated in the accompanying drawings where- 40 '
in similar characters of reference designate cor
smooth road surface will be obtained.
Another object of our invention is to provide
responding parts and wherein:
a road roller of the type indicated which is pro
provided with- our ironing roller attachment.
Figure 2 is a perspective view showing the iron
ing roller attachment which is mounted on the
rear end of the road roller.
vided with an ironer roller, the ironer roller
being provided with ?uid actuated means for
forcing it in contact with the road surface which
is of such a nature that the pressure applied to
the road surface by the ironing roller may be
50
In its preferred form our invention contem- 10
plates the provision of a road roller of the ordi
nary type embodying a main frame, a steering
roller mounted on the forward end thereof and
two larger traction rollers mounted at the rear
end thereof, the steering roller being of greater 15
width than the space between the two rear trac
tion rollers. On the rear end of the frame be
Figure 1 is a side elevation of a road roller
Figure 3 is a rear elevation, but partly in sec
tion, of the road roller showing the ironing roller 50
varied.
attachment and the operating mechanism there
a road roller of the type indicated which is pro
vided with an auxiliary ironing roller and which
for.
Figure 4 is a longitudinal section showing the
ironing roller attachment and the manner in
' Another object of our invention is to provide
is provided with means for preventing excessive
55 amounts of pressure being exerted on the road
which it operates.
'
55
2
2,127,485
Figure 5 is a plan view of the entire road
roller.
This cylinder 23 has a piston 26 operating therein
(Figure 3) which has a, depending piston rod 21
_
With reference to the drawings, and particu
larly to Figure 1, we have shown an ordinary
connected thereto. /This piston rod 21 passes
through a packing 'gland 21a at the lower end of
road roller comprising a main frame I having a
steering roller 2 Suitably mounted on thefront
end thereof and a pair of traction rollers 3 mount
ed at the rear end thereof. It will be apparent
from Figure 5 that the roller I is wider than the
the. cylinder and extends downwardly from the
lower end of the cylinder. The lower end of this
piston rod 21 is pivoted as at 28 to a pair of up
standing lugs 29 integrally formed on the mem- ber l0. Thus, it will be apparent that the cyl
inder 23 is pivotally secured to the rear 'end of 10
the frame I while the piston rod 21 is pivotally
space between the inner edges of the traction
rollers 31
At the/rear end of this road roller we provide
an ironing roller attachment which serves to ef
fectively iron out the high spots in the road sur
secured to the ironing roller attachment which
15 face.
This ‘attachment comprises an ironing
roller 4 which is of comparatively small diameter
so that it will more effectively iron out the high
spots and produce a smooth surface. This roller
4 is preferably of such a width that it~operates
20 upon the entire surface previously rolled by the
rollers 2 and 3. However, the roller 4 may be of
any desired width.
The roller 4 is carried by an axle which is car '
ried in hubs 6 at each end thereof. Each hub 6
25 is provided with a pair of integral upstanding
lugs 1 between which the lower end of a link 8
isdisposed. The end of the link is pivoted to
the lugs by means of a pin 3. The upper end of
the links 3 are pivoted to a transversely extend
30 ing supporting member l0 as at H. Intermediate
its ends this supporting member l0 has a pair
of forwardly extending li_nks'l2 which are inte
graliy secured to the .member ID at their rear ends
but which have their forward ends pivotally con
nected as at l3 to the rear end of the frame i.
A yoke member l4 extends forwardly from the
hubs 6 and transversely in front of the roller 4.
This yoke structure is of channel cross section as
illustrated best in Figure 4 and is provided with
a rearwardly extending blade I 5 secured to its
upper edge and a rearwardly extending blade l6
secured to its lower edge by means of bolts l1.
These blades are so disposed that their edges are
substantially in contact with the roller 4. They
45 serve to scrape the surface of the roller and to
keep it clean. A space is formed between the
blades i5 and it which is preferably ?lled with
some absorbent material as indicated at II. A
sprinkling device l9 supplies oil or water to the
surface of the roller, part of which will be ab
sorbed by the material l8, and thus the roller
is pivotally connected to the rear end of the
frame I for vertical movement.
In order to control application of ?uid to cyl
inder 23 and exhaust of ?uid therefrom we pro 15
vide an ordinary two~way valve 30 which is man
ually operable by means of a lever 3|. This valve
30 is connected by a line 32 to the upper end of
the cylinder 23 and by a line 33 to the lower end
of the cylinder. In one position of the valve 20
fluid will ?ow through the line 32 into the upper
end of the cylinder and force the piston 26 down
wardly, the fluid in the lower end of the cylinder
exhausting through the line 33. In another posi
tion of the valve the fluid will flow through the 25
line 33 into the lower end of the cylinder and
force the ?uid out of the upper end of the cylin
der causingit to exhaust through the line 32.
The valve 30 may be set at a neutral position.
The valve 30 is connected by a supply line 34 30
to a tank (not shown) which is provided on the
machine containing fluid under a predetermined
constant pressure.
Any suitable means may be
provided for maintaining the fluid in the tank
35
under a constant predetermined pressure.
It will be apparent that when the piston 26 is
forced downwardly, the piston rod 21 moves
downwardly and forces the roller 4 in ?rm'con
tact with the road surface, since downward move 40
ment of the roller is permitted because it is piv
otally connected to the frame I by the links I 2
and 20. In order to limit the lowermost position
of the roller 4 we provide a rod 35 which has its
lower end pivoted to the lugs 29, carried by mem~ 45
ber i0, as at 36. The upper end of this rod loose
a collar 31 secured to the main
Above the collar 31 nuts 38 are thread
50
will be kept clean. The oil or water will prevent
sticking of the road material to the roller. Fur
55
thermore, the blades l5 and It will scrape the
roller to keep it clean. The sprinkling device I9
is preferably carried by the member iii. A sec
ond pair of links are provided for connecting the
ironer roller to the frame I. These links 20 have
their forward ends pivotally connected to the
frame as at 2| a substantial distance forward of
the pivot points I3. The rear ends of these links
20 are bolted to forwardly extending members 22
which are integrally secured to the yoke I4.
Thus, it will be apparent that the roller 4 is
65 rotatably carried by a structure which is pivotally
connected for vertical movement to the rear end
of the frame i by means of the links l2 and 20.
We provide means for
producing downward,
movement of the roller 4 so that this roller will
70 apply a predetermined pressure to the road sur
face. This means is hydraulically operated and
will now be described in detail.
1
We provide a cylinder 23 which is mounted at
its lower end on trunnions 24 rotatably mounted
75 in upstanding lugs 25 secured to the frame I.
The pressure in the supply tank to which the
line 34 is connected should always be the same
as the downward
55
on the roller 4.
60
surface. Therefore,
means for maintaining a constant pressure in
the supply tank should be of such a type that
the constant predetermined pressure may be var 65
with the requirements.
It will be apparent that when the valve 30
is operated to cause downward movement of the
piston 26, the ironing roller 4 will be forced in
70
contact with‘the road surface with a pressure
equal to the pressure of the ?uid in the supply
tank. Of course this pressure cannot be greater
than the effective weight of the entire machine
because it would force the piston 26 downwardly 75
2,127,4ss /,
to such an extent as to raise the rear tractor
rollers 3 from the road surface.
.
We have provided means for preventing the
rear traction rollers 3 from being raised vfrom
the road surface in case the ironing roller 4
back pressuralrbecomes excessive due to the roll
er 4 riding over an incompressible object or
high spot, there is a tendency for the piston 26
to move upwardly in the cylinder 23. If it were
not for the compensating device, this would not
passes over an incompressible object or .high
spot in the road surface. This means also serves
to prevent the entire weight of‘the machine
from being ‘effective on the ironing roller 4, in
case the roller passes over an incompressible ob
10 ject or high spot in the road. which might cause
breaking down of the road structure due to
the nature of the ironing roller. This means is
of such a nature that the back pressure exerted
on the ironing roller, or in other words the pres
15 sure tending to raise such roller, cannot exceed
a predetermined amount, which may vary in
accordance with different materials used for pro
ducing the road surface.
'
be permitted. However, because of the com
pensating device the ?uid is forced through the
line 32, conduit\,46 and into the space 44 and
when thevpressu're in ,this space exceeds a pre
determined amount the pistons 40 will'move. 10
apart. Thus, upward movement of the ironing
roller 4 will be permitted. As soon as the iron
ing roller. passes' over the incompressible object
or high spot, the springs 43‘ will force the pis
tons 40 to their original position forcing the 15
fluid back into the upper end of the cylinder 23
'
We have illustrated this device as comprising
20 a comparatively long cylinder 39 of compara
tively small cross-section which is mounted on
the upper surface of the member II]. This cyl
and the piston 26 back to its original position.
Thus, it will be ‘apparent that the piston 26
will always be maintained in the ‘position to 20
which it is moved by operation of the valve 30‘
and, consequently, the ironing roller 4, will always
be maintained at a predetermined level. under
However,
vall normal conditions of operation.
inder 39 has a pair of spaced pistons 46 mounted _
for movement therein. Each of the pistons 40
25 has connected thereto a piston rod M which ex
if the ironing roller 4 passes over an incompres
sible object or high spot so that the back ‘pres
25
sure becomes more than the pressure it is de
tends outwardly through the corresponding end
sired to apply to the road surface, the com
of the cylinder and hasnuts 42 threaded on the
portion extending from the cylinder. One of
these nuts abuts the end of the cylinder. A
mit the piston 26 to move upwardly and, con
sequently, the roller' 4 to move upwardly reliev 80
ing the excessiveback pressure. However, as
soon as the roller passes over the incompress
ible object or high spot, the compensating de
vice automatically operates to return piston 26
to its original position and, consequently, roller 35
4 to its original position.
It will be apparent that the maximum pressure
applied to the road surface by the roller 4 is
limited by the setting of the compensating de
vice. If the pressure applied by the ironing roller 40
4 tends to become excessive and above the maxi
mum desired, and, consequently, the back pres
sure becomes excessive, the compensating device
30 compression spring 43 disposed within the cyl
inder surrounds each of the rods 4!. The pis
tons 40 are free to move in the cylinder but are
so fitted therein that ?uid is prevented from
passing these pistons. The space 44 in the cylin
der between the two pistons 40 is adapted to
receive ?uid. This ?uid enters this space through
a~port 45 provided midway between the ends of
the cylinder 39. The port 45 is connected to the
pipe 32, which is connected to the upper end of
40 cylinder 23, by means of a ?exible conduit 46.
By means of the nuts 42 the pistons 46 may
be adjusted inwardly towards each other or out
wardly from each other to permit the springs
43 to expand or to cause them to be compressed.
The nuts 42 may be‘ so adjusted that the springs
will resist a predetermined pressure produced
by fluid in the space 44. It will be apparent
that the more that the springs 43 are compressed,
the more resistance they will have to outward
110
movement of the pistons 40.
pensating device automatically operates to per
automatically operates to relieve this pressure.
Thus, there is no danger of the road surface be
45
ing subjected to pressure greater than a predeter
mined maximum.
Furthermore, there is no
danger of the traction rollers being raised from
the road surface.
In using the entire road roller, the pressure
which it is desired to apply to the road surface _
In the operation of this compensating device, is selected in accordance with the particular ma
being used and other conditions. This
a predetermined pressure of ?uid is applied above terials
pressure is then developed in the supplytank to
the piston 26 causing the roller 4 to bear upon
55
the road surface with a predetermined pressure. which the line 34 is connected. The nuts 38 on
' the road 35 are then set so as to limit downward
The nuts 42 are then adjusted to cause the
movement of the ironing roller 4 to a predeter
springs 43 to exert a predetermined resistance. .mined
extent, depending upon the grade it is
The springs are so set that it will be necessary
for a predetermined pressure to be developed in
the space 44 before the pistons 46 will move
outwardly away from eachv other. This pres
sure should be equal to the maximum pressure
it. is desired to obtain on the road surface by
means of the ironing roller. As the roller moves
if it strikes an incompressible object or
,- along,
high spot, the back pressure or pressure tend
ing to raise the ironing roller, will become ex
cessive and will become greater than that which
it is desired to apply to the road. Furthermore,
there will be a tendency for the entire machine
to be raised so that the traction rollers 3 will
tend to move out of contact with the road sur
75
face. However, this will be prevented since the
compensating device is set to limit the back
pressure to a ‘predetermined amount. When the
desired to obtain. This stop mechanism is set
to limit downward movement of the rollers to the 60
predetermined grade it is desired to obtain. The
nuts 42 of the compensating device are then ad
justed so that the pressure to be applied by the
roller 4 will be limited to a predetermined maxi
mum which will be substantially the same as that 65
in the supply tank. Then the lever 3| is oper
ated to operate the value 30 to cause fluid to be
supplied above the piston 26 in cylinder 23 and to
be exhausted from beneath the piston. The ?uid
in the upper end of the cylinder always tends to
force the piston 26 downwardly because the upper
surface of the piston is of greater area than the
lower surface thereof. This forces the ironing
roller 4 into contact with the road surface and
will press it against the road surface with a pre 76
4
2,127,485
determined pressure which will be equal to the
pressure of the fluid in the supply tank. This
will be a constant pressure.
As the entire machine moves along, the rollers
2 and I pass ove the road surface and compress
means for forcing said ironing roller downwardly
into contact with the road surface with a pre
determined pressure, and means for automatical
ly relieving thev downward pressure exerted by
serves to further compress and compact the road
said ironing roller on said road surface whenever
it tends to exceed said predetermined pressure.
surface and to iron out the irregularities thereof.
The pressure exerted by the iron'er roller under
ing structure mounted for movement along a road
it. The ironing roller~4<following the other rollers,
2. In a device of the type described, a support- '
surface, an ironing roller mounted'on said sup
porting structure in such a manner that it may
normal conditions is constant, serving to compact
the road surface to a preselected. grade. However,
move vertically, non-compressible ?uid-actuated 10.
means for forcing said roller downwardly into
I when the ironing roller passes over an incom
pressible object orhigh spot, the compensating
device servesto relieve excessive back pressure so
15 that the pressure exerted by the ironing roller 4
is limited to a predetermined maximum. Thus,
breaking down of the road ‘structure is prevented
and movement of the traction rollers 3 out oi.“
contact with the road surface is prevented.
20v
When it is' desired to raise the ironing roller
into inoperative position, the valve 30 is reversed
so that ?uid will be supplied below the piston 26
and exhausted from above it, permitting upward
- movement of the piston and, consequently, of the
ironing roller.
This upward movement will be
_ comparatively fast because the cross-sectional
area of the space in the lower end of the cylinder
to be filled with ?uid is comparatively small.
It will be apparent from the above that we have
provided a road roller which is provided with an
contact with the road surface, and means for
permitting upward movement of
roller when the back pressure
exerted thereon exceeds a predetermined maxi 15
mum, said last-named means serving to return
said ironing roller automatically to its original
position when the back pressure exerted thereon
falls to the said predetermined maximum.
3; In a device of the type described, a support 20
ing structure mounted for movement along a
road surface, an ironing roller mounted on said
supporting structure, in such a manner that it
may move vertically, non-compressible ?uid-actu
ated means for normally forcing said roller down 25
wardly into contact with the road surface, and
means for automatically permitting upward
movement of said ironing roller when the back
ironing roller of such a nature that the irregulari
ties in the road surface will be effectively ironed
pressure exerted thereon exceeds a predeter
out with the result that a very smooth road sur
face will be obtained.‘ The ?uid means which
operates the ironing rollers is of such a nature
that the pressure applied to the road surface by
its original position when the back pressure ex
it may be varied. Furthermore, the compensat
ing device serves to prevent an excessive amount
of pressure being exerted on" the road structure
"40 or the traction rollers being forced out of contact
with the road surface when the ironing roller
passes over an incompressible‘ object or a high
spot. In using our device, the ironing roller can
be set to obtain the proper grade and this grade
mined maximum, said last-named means serv 30
ing to return said ironing roller automatically to
erted thereon falls to the said predetermined
maximum, said last-named means being adjust
able so that the said predetermined maximum 35
may be varied.
4. In a device of the type described, a support
ing structure mounted for movement along a road
surface, an ironing roller mounted on said sup
porting structure in such a manner that it may 40
‘move vertically, non-compressible ?uid-actuated
means for forcing said roller downwardly into '
contact with the road surface, and non-compress
46 can be obtained in one pass over the material.
' ible ?uid-actuated means for automatically per-,
The pressure which it is desired to exert on the mitting upward movement of said ironing roller 45
road material varies with different materials.
The compensating device on our machine may be
set to limit the pressure to a predetermined maxi
mum suitable for the particular material.
Although we prefer that the ironing roller be
located at the rear end of the machine, it will be
apparent that our invention is not necessarily
limited thereto.
V55
.
,
Although we have specified herein that we pro
vide an ironing roller on the road roller, it is ap
parent that a scari?er or other member might be
substituted for the ironing roller 4 of our attach
ment. The other mechanism would remain the
same. Thus, if the scari?er contacted with a
large stone or boulder, the compensating device
would permit upward movement thereof. In the
claims where we specify an ironing roller, we in
tend to cover other members which might be sub
stituted therefor.
Many other advantages will be apparent from
- the preceding description, the drawings and the
following claims.
-
Having thus described our invention, what we
claim is:
‘
-
'
1. In a device of the type described, a support
ing structure mounted for movement along a road
surface, an ironing roller mounted on said sup
porting structure in such a manner that it may
15 move vertically, non-compressible ?uid-actuated
when the back pressure exerted thereon exceeds
a predetermined ‘ maximum,
said
last-named
means serving to return said ironing roller auto
matically to its original position when the back
pressure exerted thereon falls to the said pre
50
determined maximum.
5. In a_ device of the type described, a support
ing structure mounted for movement along a road
surface, an ironing roller mounted on said sup
porting structure in such a manner that it may 55
move vertically, non-compressible ?uid-actu
ated vmeans for forcing said roller downwardly
into contact ‘with the road surface, and non
compressible ?uid-actuated means for automati
cally permitting upward movement of said iron 60
ing roller when the back pressure exerted there
on exceeds a predetermined maximum, said last
named means serving to return said ironing roller
automatically to its original position when the
back pressure exerted thereon falls to the said 65
predetermined maximum, said last-named means
being adjustable so that the said predetermined
maximum may be varied.
6. In a device of the type described, a sup
porting structure mounted for movement along 70
a road surface, an ironing roller mounted on said
supporting structure in such a manner that it
may move vertically, non-compressible ?uid
actuated means for forcing said roller down- 75
5
2, 127,485
said cylinder and being connected to said iron
ing roller, means for supplying‘ non-compressible
wardly into contact ‘with the road surface; said
means comprising cylinder and piston mecha
nism connected to said supporting, structure and
to said ironing roller, and non-compressible
?uid-actuated means for permitting upward
fluid to said cylinder above said piston, and non- ,
compressible fluid-actuated means for permit
ting upward movement of said ironing roller
when the back pressure exerted thereon exceeds
movement of said ironing roller when the back
a predetermined maximum, said last-named
pressure exerted thereon exceeds a predetermined
maximum, said last-named means comprising
cylinder and piston mechanism‘ and being ad
Justa'ble to vary said predetermined maximum.
means comprising a cylinder having a port in
termediate its ends which is_ connected to the
upper end of said first-‘namedcylinder, said last 10
named cylinder having a pair of pistons therein
'1. In a device of the type described, a sup
disposed on opposite sides of said port, and a
porting structure mounted for movement along
compression spring of predetermined resisting
a road surface, an ironing roller mounted on
said supporting structure in such a manner that
it may move vertically, non-compressiblefiuid
power disposed in each end of said cylinder be
tween one of said pistons and the corresponding 15
end of the cylinder.
wardly into contact with the road surface with
porting structure mounted for movement along a
for forcing said roller down
15
11. In a device of the type .described, a sup
a predetermined pressure, and non-compressible
fluid-actuated means for automatically permit
road surface, an ironing roller mounted on said
supporting structure in such a manner that it 20
ting upward movement of said ironing roller
may move vertically, non-compressible ?uid
when the pressure exerted by it on the road sur
face exceeds said predetermined pressure.
'
actuated means for forcing said roller down
'
8. In a device of the type described, a sup
porting member mounted for movement along a
road surface. an ironing roller member mounted
wardly into contact with the road surface, said
means comprising a cylinder mounted on said
supporting structure and a piston having a rod
on said supporting member in such a manner that
it may move vertically, non-compressible fluid
actuated means for forcing said roller member
downwardly into contact with the road surface,
said means comprising a cylinder connected to
ing roller, means for supplying the non-com
30 one of said members and a piston connected to
pressiblefluid to said cylinder above said piston,
and non-compressible fluid-actuated means for 30
permitting upward movement of said ironing
the other of said members, and non-compressible
?uid-actuated means for permitting upward
movement of said ironing roller when the back
pressure exerted thereon exceeds a predetermined
roller when the back pressure exerted thereon
exceeds a predetermined maximum, said last
named. means comprisinga cylinder having a
port intermediate its ends which is connected to 35
85 maximum, said last-named means comprising a
the upper end of said first-named cylinder, said
cylinder connected to one end of the ?rst-named
cylinder, said last-named cylinder having a pis
ton therein, and means of pre-selected resisting
40
25'
extending downwardly through the lower end of
said cylinder and being connected to said iron
power normally tending to prevent movement of
said piston.
last-named cylinder having a pair of pistons
therein disposed on opposite sides of said port,
each of said pistons having a piston rod extend
ing outwardly through the corresponding end of
40
said cylinder, a compression spring disposed in .
surrounding relation to each of said piston rods
9. In a device of the type described, a support
and being located between the piston and the
ing structure mounted for movement along a corresponding end of the cylinder, each of said
road surface, an ironing roller mounted on said rods having a nut threaded on the portion
supporting structure in ‘such a manner that it thereof extending from the cylinder so that the"
may move vertically, non-compressible fluid
compression spring may be compressed to any
actuated means for forcing said roller down
desired amount to vary the resistance thereof.
wardly into contact with the road. surface, said
12. In a device of the type described, a sup
means comprising a cylinder mounted on said porting structure mounted for movement along
supporting structure and a piston having a rod a road surface, an ironing roller mounted on said
50 extending downwardly through the lower end of
supporting structure in such a manner that it
said cylinder and being connected to said ironing may move vertically, non-compressible ?uid
roller, means for supplying non-compressible actuated means for forcing said roller down
fluid to said cylinder above said piston, and non
wardly into contact with the road surface with 55
compressible fluid-actuated means for permit
a predetermined pressure, other means for lim
U! in ting upward movement of said ironing roller
the extent of downward movement of said
when the back pressure exerted thereon exceeds iting
ironing roller, and non-compressible fluid actu
a predetermined maxim , said last-named
ated means for automatically permitting upward 60
means comprising a cylinder having a port inter
mediate its ends which is connected to the upper movement of said ironing roller when the back
so end of said ?rst-named cylinder, said last-named
cylinder having a pair of pistons therein disposed
on opposite sides of said port, and means of pre
mined pressure.
I
13. In a device of the type described, a sup
selected resisting power for resisting movement
porting structure mounted for movement along
of said pistonsvaway from each other.
‘
10. In a device of the type described, a sup
a road surface, an ironing roller mounted on said
supporting structure in such a manner that it
porting structure mounted for movement along
may move vertically, non-compressible ?uid
a road surface, an ironing roller mounted on said
actuated means for forcing said roller down
supporting structure in such a manner that it
wardly into contact with the road surface with 70
a predetermined pressure, adjustable means for
limiting the extent of downward ‘movement of
said ironing roller, and non-compressible ?uid
actuated means for automatically permitting up
ward movement of said ironing roller when the 75
may move . vertically, non-compressible fluid
70 actuated means for forcing said roller down
wardly into contact with the road surface, said
means comprising a cylinder mounted on said
supporting structure and a piston-having a rod
75
pressure exerted thereon exceeds said predeter
extending downwardly through the lower end of
6
2,127,405
‘ back pressure‘ exerted thereon exceed.
determined 1:»
pre
.
ternuned menu
Dream-e.
and
actuated
for an
non-compressible '?uld
14. A road roller comprising a main' frame :up- - ward movement of sold
Ironing Permitan‘ upM11!
roller' when
the
ported by front and rear rollers. an ironing roller back me exerted thereon exceeda
laid pre
mounted on the rear end of said frame, behind determined pressure.
'
the rear rollers in such a manner that It may
mm
L. Wm.
cmmoab
A. ownns.
move vertically, non-compressible ?uid-actuated
mean for tot-cm: said lronlnz roller downwardly
Into contact with the road Iurtace with a prede-'
_
'
IARL I. BIICHER;
.
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