June 16, 1959‘
J_ J, MADIS’ON Em
‘2,890,632,
ROAD SURFACING MACHINE‘
Filed Feb. 15, 1957
5 Sheets-Sheet 1
INVENTORS‘,
James J. Madison
‘BY ‘
Fed B .
/
.
W'Ison
l
I
June 16, 1959
J. J. MADISON ETAL
2,890,632
ROAD SURFACING MACHINE
Filed Feb. 15, 1957
3 Sheets-Sheet 2
INVENTORS,
James J. Madison
i‘,
Fred B. Wllson
June 16, 1959
2,890,632
J. J. MADISON ETAL
- ROAD SURFACING MACHINE
Filed Feb. 15, 1957
5 ‘Sheets-Sheet 3
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2,890,632
Patented June 16, 19.59
12
prove the design, construction and e?iciency of road
?nishing machinery.
The means by which the-foregoing and other objects
of the present invention are accomplished and the man
ner of their accomplishment will be readily understood
from ‘the following speci?cation upon reference to the
2,890,632
RQAD SURFACKNG MACHWE
accompanying drawings, in which:
James J. Madison and Fred'B. Wilson, Memphis, Tenn.
Application February 15, 1957, Serial No. 640,547
6 Claims. (Cl. 94-46)
Fig. 1 is a side elevational View of a road surfacing
machine embodying the present invention.
Fig. 2 is a top plan view of the device of Fig. 1.
10
Fig. 3 is a sectional view taken as on the line III-III
of Fig. 2.
Fig. 4 is a fragmentary side elevational view on an
enlarged scale illustrating the leveling means of themes
This invention relates to certain new and useful im
15 ent invention, with parts being broken away and re
moved for purposes of illustration.
Fig. 5 is a fragmentary rear viewof the device as seen
provements in means for ?nishing road surfaces, and in
particular relates to leveling means for enhancing the
in Fig. .4.
Fig. 6 is a fragmentary top'plan view of the device as
utility and e?iciency of paving surface ?nishers.
Conventional road surfacing machinery in general com 20 seen in Figs. 4 and 5.
prise a tractor device embodying a number of instru
Fig. 7 is a ‘fragmentary view on a further enlarged
mentalities for depositing and spreading paving surfacing
scale, partly in section, illustrating a preferred embodi
such as asphalt or the like, and so-called screed means
ment of universal joint connection for the sled means of
for smoothing and ?nishing the course of pavement being
thelpresent invention.
laid. Much di?iculty has been heretofore encountered 25
Fig. 8 isra view similar to Fig. 7 illustrating release
in connection with irregularities in level of the road bed
positionof the joint connection.
upon which the paving is to be laid, resulting in undesir
Fig. 9 is a fragmentary enlarged rear view illustrating
able irregularities in thickness of paving surface and sub
the connection between the sled means of the present
stantial failure to eliminate comparable irregularities in
invention.
the ?nal ?nished surface of the road under construction.
Referring now to the drawings in which the various
While attempts have been made to solve this problem, all
parts are indicated by numerals, the present invention is
known attempts have proven inadequate for the purpose
particularly adapted for use for the improvement of the
and have been limited to certain specialized uses on
operation of substantially conventional surface-levelling
particular types and kinds of road surfacing courses, and
and course-laying devices of a .type well-known in the
have been limited in utility and efficiency.
35 art and ?eld.
The principal dif?culty heretofore encountered has re
The conventional device .is primarily embodied in a
sulted from the existence, particularly in roads being
tractor or similar unit 11, which preferably includes a pair
resurfaced, of irregularities in level of a length in excess
of crawler-type tracks. The tractor device comprises the
of the wheel base of the screed-carrying tractor device.
usual motor, conventional controls, seat and other ac
The present invention basically proposes ‘to overcome this 40 cessories, ‘which are not here referred to by numerals
di?iculty by vproviding means for effectively extending the
since it is believed they are so well-known to those skilled
in the art so as to require no other speci?c identi?cation.
supporting base for the screed means to a length in excess
of twice the original length of the wheel base of the
tractor, and to so adapt the structure that the conventional
As is well-known, such devices comprise means for
depositing road surfacing material such as asphalt or
screed means become, in essence, strike-off means.
45 other suitable surfacings, with the depositing devices being
A further problem encountered is in connection with
located adjacent the rear of the tractor device, and with
the adjustability of screed means to provide for road
the road contacting treads or track devices 13 being
crown, and the present invention contemplates the pro
positioned forwardly of the zone of surfacing material
vision of supporting sled means and adjustment means
for coordinately adjusting the sled means to ?t the crown
established by the supported screed means.
deposit. Rearwardly of the depositing zone, and prefer
The principal object of the present invention is to
ably supported at the rearmost end of tractor 11 are
screed means 15 "which extend transversely substantially
the Width of the course being laid and are preferably
provide a new and novel means for maintaining surface
centrally divided into sections 15A, 15B and provided
.level in road ?nishing machinery.
A further object of the invention is to provide such
means which comprise elongated composite arms pivot
ally connected with a screed-carrying tractor device and
extending rearwardly therebeyond, with a pair of sled
means connected with the elongated arms and supporting
the rearward end of said arms to effect screed suspen
sion support intermediate the tractor device and the sled
means.
A further object of the invention is 'to provide means
for adjustably interconnecting such sled means to estab
lish and maintainlroad crowning position.
A further object of the invention is to provide
and novel means of connecting such sled means
supporting arms.
A further object of the invention is to provide
necting means between such suPpOrting arms and
means which include a universal joint action; and
new
with
with central adjustment means 17 for the purpose of
55
altering the relative angularity of the divided screed
means to provide for a positive .or negative crowning of
the road surfacing as maybe desired.
It will be understood that by the term “positive crown
ing” it is meant that the respective screed members are
centrally upwardly inclined from the horizontal in order
to provide a central crown in the road surfacing, with the
road surfacing declining away from the central crown;
while by the term “negative crowning” it is meant that
the respective screed members are arranged centrally de—
65 clined from the horizontal so that the center of the road
surface is depressed and outwardly from the central por
tion the road surface is upwardly inclined.
Preferably adjustment means 17 provides a central con
con—
nection between screed sections 15A, 15B, and adjacent
sled 70 their outer ends the respective screed sections are ‘con
A further object of the invention is generally to im
nected as by suitable screw means 18 to the rearward ends
of side arm 19. The rear ends of the respective side arms
2,890,632
,
3
I
_
19 are disposed to extend slightly beyond the rear end of
tractor 11, and thus the screed means 15 are disposed
rearwardly of the tractor p'r‘oper. At their forward ends
side arms 19 arerpivotally connected as at-21 to_ tractor 11.
Adjacent the rear ends of side arms 19- an intermediate
,
4
'
.
Each of the sled members 65 comprises a substantially
?at, rectangular base plate 67, which forms a smooth
under surface for the sled member and is adapted to seat
upon the underlying road bed or course being ?nished
and smoothingly to be moved therealong. Each of the
portion 23A of relatively greatly elongated extension arms
23 are pivotally connected to the side arms 19. Prefer
ably the extension arms 23 include the intermediate por
tion 23A which is disposed in a diagonally inclined posi
plates is provided with a peripheral strengthening frame
work 69. Extending from each of the sled frames 69 to
an adjacent portion of rear arm portion 23C is an adjust
portion 230 which is connected with the lower and rear
adjacent but spaced inwardly from the outer end of the
sled member. Theother turnbuckle rod 718 is swingably
able connection means 71, which is here shown as tum
tion as best seen in Figs. 1 and 4, a forward portion 233 10 buckle means. As can readily be seen, one of the turn~
buckle rods 71A is swingably connected to an eye 73
which is connected with the forward and upper end of
rigidly fixed to a forward portion of sled frame 69 and
intermediate portion 23A, and a rearward or attachment
ward end of intermediate portion 23A.
_ ,
The connection of extension arms 23 to side arms 16 attached to a connector 75 mounted rigidly on arm por
tion 230. The ends of rods 71A, 71B are oppositely
19. is accomplished preferably by pivots 25 so as to
threaded and are engaged by a turnbuckle barrel 71C,
hingedly connect extension arms 23 to the rearward end
permitting adjustment of the length of the connection be
of side arms 19, thus providing an elongated composite
tween the leading edge of the sled members and the exten
hinged arm means consisting respectively of a side arm
19 and an extension arm 23, with the screed means 15 20 sion arms.
being disposed approximately adjacent the hinged con
nection between the arm components of the hinged com
posite arm means. Preferably extension arms 23 respec
It will be seen that the forward or leading
edge of the respective sled members 65 may be raised or
lowered relative to extension arms 23 by the adjustment
of the length of the connection means 71.
Closely adjacent to but spaced outwardly from the inner
tively are disposed outwardly from side arms 19.
Adjacent the forward end of forward arm portion 23B 25 ends of the respective sled members 65 are rigidly mount
ed upstanding standards 77 which may be formed, as
a thrust screw 27 provided with suitable handle means
shown, of angle members, or other suitable structural
28 is threadedly engaged with an internally threaded block
members. To one of the standards 77 one end of a spacer
.29. The lower end of thrust screw 27 seats solidly upon
member 79 is ?xed, being shown as the right hand standard
an abutment seat 31 which is carried by a suitable bracket
32 rigidly ?xed to the outer portion of side arm 19 inter 30 77 in Figs. 5 and 6. Spacer member 79 preferably ex
tends substantially horizontally from the one standard to
. mediate the length of the side arm. It will be observed
which it is rigidly ?xed across the adjacent but inde
that forward arm portion 23B is outwardly offset from
pendent inner edges of the sled members and extends
side arm 19, and is disposed at a level above the level of
slidably through the opposite standard 77. Intermediate
side arm 19. Thrust screw 27 provides means for adjust
ing the angular relationship between side arm 19 and arm 35 the standards 77 spacer member 79 is provided with a
threaded section 81 which is engaged by limit nuts 83, 84,
portion 238, and consequently provides means for ad
and adjacent its free end may be provided with a smooth
justing the hinged position of the composite portions of
section 85 having a limit head 87. As can be seen, by
the hinged arm means.
.
simply shifting the position of nut 83 along threaded por
Preferably rearward arm portions 230, connected at
tion 81 the relative angularity between sled members 65
their forward ends with the rearward end of intermediate
may be adjusted. This angularity is shown in Figs. 5
portion 23A, extend rearwardly therefrom and converge
and 6 as adjusted to substantially a maximum positive
inwardly, as best shown in Fig. 2. Suitable bracing, in
crowning as described hereinabove.
cluding a cross brace 33 and intermediate diagonals 35,
The sled members 65 at their inner ends are disposed
are provided for bracing and maintaining rear arm por 45
tions 23C in their relatively spaced position. Preferably
the diagonals 35 at their inner ends are each pivoted to a
plate 37 carried by cross brace 33.
To the rearmost ends of arm portions 230 are respec
with the inner edges of the base plates closely adjacent,
but minutely spaced apart, and the sled members extend
outwardly to provide a span substantially of a length
equal to the width of the course being laid. Preferably
tively connected upright posts 39. Preferably arm por 50 the sled members are hingedly interconnected, which in
terconnection is shown as comprising hinge means 88
tions 23C at their rear ends are provided with enlarged
collars 41 in which the upper ends of posts 39 are in
serted and retained against relative vertical movement as
disposed respectively adjacent the leading edges of each
of the sled members and adjacent the rearward or trailing
edges of each of the sled members. Preferably each of
is secured at its opposite ends to the upper and lower 66 the hinge means 88 is disposed to lie between the inner
most portions of sled frames 69 and each of the hinge
portions of arm portions 23C, the X-bracing being dis
means may comprise a hinge pin 89 and a pair of hinge
posed closely adjacent to collars 41 and rearwardly of the
leaves 91. Pin 89, interposed between the sled members
cross bracing 33, 35.
above the level of base plates 67, serves to maintain the
A knuckle joint 47 is ?xed to the lower end of each of
the posts 39. Preferably the knuckle joint 47 includes 60 minor spacing between the sled members and to permit
movement of hinge leaves 91 into positive crowning posi
a housing 49 having a rearwardly disposed domed portion
tion or negative crowning position of the sled members
51 which is adapted to engage with a ball member 53,
as heretofore described. As shown in Fig. 9, when the
and the knuckle joint 47 is provided with releasable clamp
sled members are substantially parallel and level hinge
means for locking the ball in the housing against separa
tion therefrom while permitting relative rotation there 65 leaves 91, which are respectively rigidly ?xed to the frame
portions, are upstanding and substantially parallel. When
between. Preferably the clamp means comprises a slide
by keys 43.
For additional stability an X-bracing 45
plate 55 mounted in housing 49, the slide plate 55 being
moved to positive crowning position (Fig. 5) the hinge
leaves spread somewhat apart, and when moved to a
negative crowning position, not shown, the hinge leaves
an external toggle arm 59 for shifting the clamp plate
55 toward and away from ball 53 to lock and unlock the 70 move into converging relationship above the hinge pin.
‘engaged by a rotatable cam 57 which is connected with
ball into the housing. Ball 53 is preferably provided with
The sled members are held against relative lateral move
ment by extension arms 23, posts 39, X-bracing 45 and
by hinge means 88, while permitting hinged movement to
positions of angularity relative to each other under the
llajzrs 63, which each form a part of a pair of sled mem
rs 65.
'
.
75 in?uence of spacer member 79 and standards 77, the
a downwardly projecting stud 61. Each ball member 53
is connected by its stud 61 to one of a pair of beam mem
:aseaeea
sled members being retained in such relative angularity
by the spacer member.
It will be seen that as posts 39 are supported by sled
members 65 the rearward ends of extension arms 23 con
nected to the posts 39 are supported and consequently
of tractor '11 and underlie side arms “19 forwardly .of
brackets 32 for effecting lifting of arms 19and conse
quently of arms 23 to lift posts 39 away from the sled
members.
'It will further be observed that when the sled members
the screed means 15 connected to side arms 19 are sus
are attached, the thrust screws 27 are effective to ac
pended from the composite arms comprising side arms 19
complish adjustment of the relative height of the inter
and extension arms 23 at a point intermediate the sled
mediately supported screed means, since raising or lower
members and the forward arm pivots 21, thus greatly
ing of the rear end of arms 23 will effect a change in the
increasing the effective supporting base for the screed 10 position of the arms 19 through pivots 25, consequently
means.
effecting adjustment of the height of the screed means
As the device is utilized in the ?nishing of a road sur
facing course, the road surfacing material is deposited in
relative to the roadbed.
We claim:
1. In road surfacing machinery which includes a trac—
a conventional manner well-known to those skilled. in the
art forwardly of the screed means. It is initially leveled 15 tor device adapted to deposit surfacing material along
off and smoothed by the screed means, but in the event
a road bed, a pair of side arms respectively pivoted to
that the crawler tracks 13 of tractor 11 deposited for—
opposite sides of said tractor device adjacent the forward
wardly of the screed means encounter an irregularity in
end of said tractor device and extending rearwardly into
surface of the uncovered road bed the greatly elongated
adjacency with the rear end of said tractor device, and
composite arms 19, 23 prevent exaggeration of vertical 20 screed means connected to said arm means adjacent said
movement of the screed means and effectively accomplish
rear end for levelling the deposited material; means great
a substantial maintenance of the intermediately suspended
ly elongating the effective base of said machinery and
screed means at desired surface ?nishing level. The sled
effecting suspension of said screed means intermediate
members are subsequently advanced over the laid and
said base when elongated comprising a pair of exten
screed-leveled course and accomplish a second smoothing
sion arms respectively lying alongside a portion of said
and ?nishing of the course, thus more effectively pro
side arms and extending rearwardly therebeyond, pivot
viding a satisfactory surfacing for the roadway.
means pivotally connecting an intermediate portion of
It will be observed that as heretofore pointed out the
each extension arm to the side arm proximate thereto
screed means may be adjusted as to relative angularity
adjacent the rear ends of said side arms, thrust means
in order to provide, if desired, a crown, either positive 30 carried by said extension arms forwardly of said pivot
or negative, to the roadbed being ?nished. Through the
means,.abutment means ?xed to said side arms underly
use of spacer member 79 and limit nuts 83, 84 engaging
ing said thrust means and engaged thereby, said thrust
standards 77 the relative angularity between sled members
means being adjustable relative to said abutment means
65 may be similarly adjusted to correspond to the crown
for varying the angular relationship between said side
ing established in the screed means. The universal joint
arms and related said extension arms forwardly of said
connection between the posts 39 and sled members 65
pivot means to vary the elevation of the rearward ends
through the knuckle joints 47 permits the angular ad
of said extension arms, a pair of upright posts respective
justment of the respective sled members relative to the
ly connected to and extending below said extension arm
posts, while the posts are maintained substantially perpen
rear ends, a pair of sleds hingedly connected adjacent their
dicular to the extension arms 23. Additionally, the uni
inner ends, releasable knuckle joint means connecting the
versal connection permits the raising or lowering of the
‘lower ends of said posts to said sleds whereby said sleds
leading edges of sled members 65 through the adjustment
effect support of said extension arms, said sleds being of
of connections 71 which provides for establishing the
substantially the same width and the total Width of said
plane of the sleds, with particular reference to the type 45 sleds being substantially equal to the width of said trac
of surfacing spread upon the roadbed. ‘Additionally, the
tor means, each said sled including a ?at plate-like base
knuckle joint connections between the posts and the sled
coextensive with the said width of said sled, adjustment
members permit the use of the present device with the
means connecting the leading edge of each said sled to
greatly elongated composite arms 19, 23, even along
its related said extension arm for adjusting the elevation
curved road surfaces, since, as can be seen, the arms may
of the leading edge of said sled relative to its said arm,
be respectively turned relative to the sled members by
adjustable spacer means above the inner portions of said
virtue of the connection.
sleds interconnecting the adjacent inner portions of said
It will be seen that the sled members 65 may,'when de'
sleds for establishing the planar angularity of said sled
sired, be readily detached from rear posts 39 by a simple
bases relative to each other, said joint connections pro
shift of the knuckle joint clamp means from the vposition 55 viding for adjusting movements of said sleds relative to
shown in Fig. 7 to the position shown in Fig. 8, releasing
said posts without disturbing the position of said posts
ball 53 from engagement by plate 55 and freeing the ball
relative to said arms.
for separation from housing 49. Posts 39 may then be
2. In road surfacing machinery which'includes a trac
lifted by arms 23 away from the sled members, effecting
tor device adapted to deposit surfacing material along
completion of the detachment. In order to provide for 60 a road bed, a pair of side arms respectively pivoted to
lifting of arm members 23, and to prevent undesired jack
opposite sides of said tractor device adjacent the forward
kni?ng of arms 23 relative to arms 19, means are pro
end of said tractor device and extending rearwardly into
vided for detachably connecting arms 23 to arms 19 at a
adjacency with the rear end of said tractor device, and
point spaced from pivot 25. Preferably threaded block
screed means connected to said arm means adjacent said
29 is apertured as at 93 in alined registry with a ‘similar 65 rear end for levelling the deposited material; means
aperture formed in the upper portion of‘bracket 32. The
aperture in bracket 32 being disposed substantially'above
greatly elongating the effective base of said machinery
and effecting suspension of said screed means intermedi
abutment seat 31 and being horizontally alined with aper
ate said base when elongated comprising a pair of exten
ture 93. A pin 95 may be inserted in the alined apertures,
sion arms respectively lying alongside a portion of said
as shown in Fig. 4, for effectively keying the arms together 70 side arms and extending rearwardly therebeyond, pivot
and establishing a two-point connection between the arms
means pivotally connecting an intermediate portion of
so that ,the desired lifting may be accomplished without
each extension arm to the side arm proximate thereto
hinged movement about pivot 25. For convenience pin
adjacent the rear ends of said side arms, means for vary
95 may be connected to block 29 by a chain ‘97. Pref~
ing the angular relationship between said side arms and
erably hydraulic jacks 99 are carried ‘by the opposite sides 75 related said extension arms forwardly of said pivot means
.
2,890,632
to vary the elevation of the rearward ends of said exten
- sion arms, a pair of upright posts respectively connected
to and extending below said extension arm rear ends,
a pair of sleds hingedly connected adjacent their inner
ends, releasable knuckle joint means connecting the low
er ends of said posts to said sleds whereby said sleds
effect support of said extension arms, said sleds being
of substantially the same width and the total width of
said sleds being substantially equal to the width of said
tractor means, each said sled including a ?at plate-like
base coextensive with the said width of said sled, ad
justment means connecting the leading edge of each said
sled to its related said extension arm for adjusting the
elevation of the leading edge of said sled relative to its
said arm, adjustable spacer means above the inner por
tions of said sleds interconnecting the adjacent inner
portions of said sleds for establishing the planar angular
ity of said sled bases relative to each other, said joint
connections providing for adjusting movements of said
sleds relative to said posts without disturbing the posi
tion of said posts relative to said arms.
3. In road surfacing machinery which includes a trac
tor device adapted to deposit surfacing material along
a road bed, a pair of side arms respectively pivoted to
related said'extension arms forwardly ‘of said pivot means
to vary the elevation of the rearward ends of said exten
sion arms, a pair of upright posts respectively connected
- to and extending below said extension arm rear ends, a
' pair of interconnected sleds, releasable knuckle joint
means connecting the lower ends of said posts to said
sleds whereby said sleds effect support of said extension
a'rms, said ‘sleds being of substantially the same width and
the total width of said sleds being substantially equal to
the width of said tractor means, each said sled including
a Hat plate-like base coextensive with the said width of
i said sled, adjustment means connecting the leading edge
‘of each said sled to its related said extension arm for
adjusting the elevation of the leading edge of said sled
relative to its said arm, said joint connections providing
for adjusting movements of said sleds relative to said
posts without disturbing the position of said posts rela
tive to said arms.
5. In road surfacing machinery which includes a trac
tor device adapted to deposit surfacing material along a
road bed, a pair of side arms respectively pivoted to op
posite sides of said tractor device adjacent the forward
end of said tractor device and extending rearwardly into
adjacency with the rear end of said tractor device, and
opposite sides of said tractor device adjacent the for
screed means connected to said arm means adjacent said
ward end of said tractor device and extending rear
wardly into adjacency with the rear end of said tractor
greatly elongating the effective base of said machinery
rear end for levelling the deposited material; means
and effecting suspension of said screed means inter
said base when elongated comprising a pair of
adjacent said rear end for levelling the deposited mate 30 mediate
extension arms respectively lying alongside a portion of
rial; means greatly elongating the effective base of said
said side arms and extending rearwardly therebeyond,
machinery and effecting suspension of said screed means
pivot means pivotally connecting an intermediate portion
intermediate said base when elongated comprising a pair
of each extension arm to the side arm proximate thereto
of extension arms respectively lying elongside a portion
adjacent the rear ends of said side arms, means for vary
of said side arms and extending rearwardly therebeyond,
ing the angular relationship between said side arms and
pivot means pivotally connecting an intermediate por
related said extension arms forwardly of said pivot means
device, and screed means connected to said arm means
tion of said extension arm to the side arm proximate
thereto adjacent the rear ends of said side arms, means
for varying the angular relationship between said side
to vary the elevation of the rearward ends of said ex
tension arms, a pair of upright posts respectively con
nected to and extending below said extension arm rear
arms and related said extension arms forwardly of said 40 ends, a pair of interconnected sleds, releasable knuckle
pivot means to vary the elevation of the rearward ends
joint means connecting the lower ends of said posts to
of said extension arms, a pair of upright posts respec
said sleds whereby said sleds effect support of said ex~
tively connected to and extending below said extension
tension arms, said sleds being of substantially the same
arm rear ends, a pair of sleds hingedly connected ad
width and the total width of said sleds being substan
jacent their inner ends, releasable knuckle joint means
tially equal to the Width of said tractor means, each said
connecting the lower ends of said posts to said sleds
sled including a ?at plate-like base coextensive with the
whereby said sleds effect support of said extension arms,
said width of said sled, said joint connections providing
said sleds being of substantially the same width and the
for adjusting movements of said sleds relative to said
total width of said sleds being substantially equal to the
posts without disturbing the position of said posts rela
width of said tractor means, each said sled including a 50 tive to said arms.
?at plate-like base coextensive with the said width of
'6. In road surfacing machinery which includes a trac
said sled, adjustable spacer means above the inner por
tor device adapted to deposit surfacing material along
tions of said sleds interconnectng the adjacent inner por
a road bed, a pair of side arms respectively pivoted to
tions of said sleds for establishing the planar angularity
opposite sides of said tractor device adjacent the forward
of said sled bases relative to each other, said joint con 55 end of said tractor device and extending rearwardly into
nections providing for adjusting movements of said sleds
adjacency with the rear end of said tractor device, and
relative to said posts without disturbing the position of
screed means connected to said arm means adjacent said
said posts relative to said arms.
rear end for levelling the deposited material; means great
4. In road surfacing machinery which includes a trac
ly elongating the effective base of said machinery and
tor device adapted to deposit surfacing material along a 60 effecting suspension of said screed means intermediate said
road bed, a pair of side arms respectively pivoted to op
' base when elongated comprising a pair of extension arms
posite sides of said tractor device adjacent the forward
respectively lying alongside a portion of said side arms
end of said tractor device and extending rearwardly into
and extending rearwardly therebeyond, pivot means pivot
adjacency with the rear end of said tractor device, and
ally connecting an intermediate portion of each exten
screed'means connected to said arm means adjacent said’ 65 sion arm to the side arm proximate thereto adjacent the
rear end for levelling the deposited material; means
rear. ends of said side arms, means offset from said pivot
greatly elongating the effective base of said machinery
means engaging said side arms and said extension arms
and effecting suspension of said screed means intermedi
for varying the elevation of the rearward ends of said
ate said base when elongated comprising a pair’ of ex
extension arms, a pair of upright posts respectively con
tension arms respectively lying alongside a portion of said 70 nected to'and extending below said extension arm rear
side arms and extending rearwardly therebeyond, pivot
ends, a .pair of interconnected sleds, knuckle joint means
means pivotally connectingan intermediate portion of
. con‘necting'the lower ends of said posts to said sleds
each extension arm to the side arm proximate thereto
adjacent the rear ends of said side arms, means for vary
whereby said sleds effect support of said extension arms,
said sleds being of substantially the same width and the
ing the angular relationship between said side arms and 75. total 'width of said sleds being substantially equal to the
2,890,632
9
Width of said tractor means, each said sled including a
References Cited in the ?le of this patent
5251-12211‘?finitié??iiii£$§é$$2iii$¥iiii§°i5,3223%;
of said sleds relative to said posts without disturbing
the position of said posts relative to said arms.
5
UNITED STATES PATENTS
2,351,593
2589256
Barbe? --------------- -- June20’1944
Hommg ------------- " Mar‘ 18’ 1952
FOREIGN PATENTS
843,856
Germany ____________ __ Sept. 15, 1952