CA1319040C - Integrated paver with windrow pick-up capability - Google Patents
Integrated paver with windrow pick-up capabilityInfo
- Publication number
- CA1319040C CA1319040C CA000596992A CA596992A CA1319040C CA 1319040 C CA1319040 C CA 1319040C CA 000596992 A CA000596992 A CA 000596992A CA 596992 A CA596992 A CA 596992A CA 1319040 C CA1319040 C CA 1319040C
- Authority
- CA
- Canada
- Prior art keywords
- conveyor
- ground
- chassis
- paver
- scraper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C2301/00—Machine characteristics, parts or accessories not otherwise provided for
- E01C2301/02—Feeding devices for pavers
- E01C2301/06—Windrow pickup
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Machines (AREA)
Abstract
INTEGRATED PAVER WITH WINDROW PICK-UP CAPABILITY
ABSTRACT OF THE DISCLOSURE
An integrated paver comprising a self-propelled chassis having a paving apparatus, such as a screed, supported on its rear end and a lifting conveyor supported on its front end. The conveyor is capable of picking-up loose paving material laid in the windrow on the road surface. It is pivotally supported on a mounting which is in-turn pivotally supported on the chassis such that the conveyor can be adjusted in two dimensions relative to the chassis. Grade controls on the conveyor control hydraulic cylinders to adjust the tilt and grade of the conveyor relative to the road surface.
Alternatively, the conveyor can rest, by force of gravity on runners which slide along the ground and hold the conveyor head a predetermined height (possibly zero) above the ground.
Additionally, the runners can be linked to floating break-away scrapers which are maintained at a set position relative to the runners. The conveyors drage chain rides over an idler shaft above and in front of the inlet end supporting shaft of the chain such that the paddles on the chain travel at close to 45°
to the road surface to reduce vibration and the slapping action of the paddles against the windrow.
ABSTRACT OF THE DISCLOSURE
An integrated paver comprising a self-propelled chassis having a paving apparatus, such as a screed, supported on its rear end and a lifting conveyor supported on its front end. The conveyor is capable of picking-up loose paving material laid in the windrow on the road surface. It is pivotally supported on a mounting which is in-turn pivotally supported on the chassis such that the conveyor can be adjusted in two dimensions relative to the chassis. Grade controls on the conveyor control hydraulic cylinders to adjust the tilt and grade of the conveyor relative to the road surface.
Alternatively, the conveyor can rest, by force of gravity on runners which slide along the ground and hold the conveyor head a predetermined height (possibly zero) above the ground.
Additionally, the runners can be linked to floating break-away scrapers which are maintained at a set position relative to the runners. The conveyors drage chain rides over an idler shaft above and in front of the inlet end supporting shaft of the chain such that the paddles on the chain travel at close to 45°
to the road surface to reduce vibration and the slapping action of the paddles against the windrow.
Description
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INTEGRATED PAVER WITH WINDROW PIC~-UP CAPABILITY
BACKGROUND OF THE INVENTION
The invention relates to machines for paving roads.
In particular, the invention pertains to self-propelled paving machines capable of picking up windrow of loose paving material without the assistance of additional equipment.
In the past, pavers were independent machines which evenly distributed loose paving material from a holding bin or hopper in the paver to the xoad directly in front of a screed supported on the paver to produce a road surface from loose paving material. The loose material was previously dumped into the hopper or holding area of the paver by use of a dump truck or other separate apparatus. More recently, Astec Industries developed a "shuttle buggie" device, which is the subject of U.S.
Patent No. 4,818,139, issued April 4, 1989. The shuttle buggie transports paving material from a dump truck or a windrow to the paver and then discharges the paving material into the paver by way of a conveyor.
Employing a single machine to pick up loose paving material laid in a windrow and pave the surface over which the machine passes avoids the need for separate ~rindrow pick-up or "shuttle buggie'l machines. Prior attempts have been made to ~' :~3~9~
develop such æ combined pick-up and paving ~evlce, suGh as that ~hown in ~he Babl~r U.S. Patent No. 4,200,408 (a similar device also was built by ~MI Corpora~ion).
The '408 patent shows a pavement laying apparatus equipped with an upwardly inclined ~hute hinge~ on a hopper front ~all and a conveyor ~upported on the ront of the paver.
This type of devi~e suffer~ from 6everal problems. First, any loose paving matarial which gets bayond the ~hute will travel beneath the wheels of th~ pav~r c~u~ing the pav~r to rise above th~ road surfaceO ~s the p~ver rises abov~ the r~ad ~urface, the ~hute will ~e carried to a higher level abovs the roa~
surface and ~llow yet more paving ~aterial ~rom the windrow to travel under the paver and r~ise the paver even further. This process will continue until ~ significant portion of the windrow is not picked up ky the shute and the paving function of the machine is ~eriously di~rupted.
A second problem with the Babler-type of paver is that it cannot adjust to the road grade relative to the rest of the paver, i.e. it is fi~edly ~ttached to the paver about that a~is. ~dditional problems include the fact that on the Babler-type paver, the 6hute and 1ight conveyor~ contained in the ~hute must be as wide as the windrow or, if not, gui~e plates are u~*d to funnel the windrow into the ~hute. Often these guide plate~ allow a significant amount of paving material u~derneath the shute or are lifted above the ground when the paver rolls o~er loose material which passes under the conveyor, Another problem apparent in the Babler device is the danger of the ~hut~ ~iolently colliding with a hidden ~L 3 ~
obstruction. Fot eacample, the 13abler ~aver ~ould vivlently collid2 with ~ manhole c:over buried under a windrow o~ paving material causlng dan~age to ~che ~hute or other parts of the paver and, pos~ibly, injury to the operator.
It i~ an object of the pre~ent i~vant~on to provi~e an impro-ted integrated pavar havillg wlndrow pick-up ~apability.
I'c is ~nother object of the pre~0nlt invention to provide a paver havin~ front ~pp~ratu~ for picking-up ~ win~row of pa~ing matl3rial and ~epo~ting it ~nto th~ paver, the i~ront appar~tu~ having the ability to pivot to adjust for both ti ït and grade ad~iustment~ relati~re to th~ re~t of the paver.
It is yet ~nother object o~ thla present invention to provide ~ paver which can at least ~emi-automatis::ally adju~t the tilt o~ th~ corlv~yor relative to the paver in ~rde!r to avoid a gradual lifting of the paver off the road surace because of leakage o~ p~ving m~terial pa~t ths conveyor.
It i~ further an object o~ ths present invention to provide a c:or~veyor ~hich will not viole~tly collide with manhole covers or other sbstruction~ hidden in the windrow.
[t ~5 yet a3l~0ther object o~ the pre~ent inventiorl to provide a way of feeding a windrow which i~ wider than the conveyor into the ~o~veyor without the atltendant problem of using funrlelinq guides.
It is yet a further obje~l: of the pre~nt invention 'co provide a conveyor which will have reduced ~7ibrations and ~e more efficient in conv2ying the loo~e pavin~ material in the windrow into the paver hopper.
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Other and ~urther objects will become apparent from the ollowi~g discussion o th~ inve~tion and it~ e~bodiments.
~U~R~ OF ~H~ I~V~TIO~
In accor~ance with thi~ invent~on~ a pa~r has a ~21f propelled chas~i~ that ha~ a hopp~r or hol~ing area for loo~e paving ~aterial. The cha~sis has a forwar~ end and a rear end; a li~ting conveyor is pivotally connected to the forward end of the ch~ssi~, and a pa~ing ~pparatus, normally a screed, i8 attached in a way known in the ~rt at the rear end o~ the chassis.
The lifting conveyor is pivotally ~upported on the forward end of the chas~is to be able to pivot in one or two ~ime~sions relative to the cha~sis. The conveyor is pivoted in two dimensions by pivotally supporting the conveyor on a mounting which 1~ pivotally support~d on the chassis about the line oF movement of the chassis to allow for grade adjustments relat~ve to the ch~ssi~. Hydraulic cylindsrs are attached rom the chas~i6 to ~oth th~ mounting ~nd the conveyor to efect adjustment~ for tilt and gra~e Y~riations.
~ he conveyor ha~ a discharg~ end located aboYe the hopper and an input end ~djacent the road surface. Th2 input end is associated with ~rious ~pparatus t~ feed as much of the windrow as ~0~6ible into the ~on~eyor and, ultimat~ly, i~to the paver hopper. The feed means includes ~crew conveyors located on either side of the i~put end of the conveyor to feed the ~3~
pavi~g material from the side6 o~ th0 win~row into the con~eyor. Thes0 w rew conveyor~ are driven by tho ~ha~t tha~
~upport~ ~he drag c~ai~ o~ the con~eyor near the input end.
When desired, ~crapers are attached behind the con~eyos at its inlet end. Th~ scrapers are piqotally ~d~u~table in a ~lurality of ~o~itions relative to the conveyor and act to ~crape the road ~urface ~8 clean as ~ossible of paving materi~l in order to reduce or el~minate ~scape of paving material under the lifting conYeyor.
In th~ event that loose paving material does travel past the ~crapers, the paver cha~si~ ~ill begin to ride lightly above the road sur~ace as it rolls over the material.
As mentionea pre~iou~ly, this can cause the entire pa~er including the conveyor to lift off the road ~urface and bscome less ef~ctive at pickinq up the loos~ paving mate~ial. ~5 mo~e pa~ing material 0scape~ the 6craper, the paver further raises above the road 6urface. As this ~ycle continue~, the conveyor becomes ~e~s an~ less ~ffective ~t picking-up the loose material in the windrow.
Two distinct strategie~ ars employe~ by.the present invention to a6~ure that the conveyor head i8 properly orianted to the surface to be paved. First, the conveyor can be primarily controlled ~t its connection to the cha~sis. Or, altsrnatively, tha interface bstween the conveyor head and the road ~urface i8 controlled by scraper~ at the conveyor head.
Of cour~e, a combination of these two strategies could be utilized without departing from the presently contemplated invention.
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With respect to the ir~t ~tr~tegy, the ~onveyor head ~8S gr~da ~80r8 0~ either ~ide of the conYeyor which ride along ~h~ road ~urface. One o4 the~e grade ~ensors ~t lea~t ~artiall~ ~on~rols the tilt of the conveyor relative to the chassis, while ~he other at least partially controls the grade o ~h~ conveyor relative to th~ cha6sis. The qrade controls relay ln~ormation to the hy~raulic cylinder~ attachad between the conveyor an~ the cha~ to make adjustments to the conveyor in order to minimi~e escape o~ loose paving material past the ~onveyor head.
An alternative method within tbe first strategy to control the e~cape of paving material i8 to allow qravity to push the conveyor heaa against the ground. To avoid too much pressure being applied by gravity, hydraulic cylindars between the chas~is and the conveyor can counterbala~ce the gravity ~orc0s such that the hea~ ~till rides o~ the ground surface, but without undue ~res~u e against t:he ground.
With respect to the second ~trategy, ~crapers are attached to the conveyor head, the ~crapers being controlled by runners attached to the ~onveyor head which ride on the ground ~ur~ace. A predetermined 8pacing is maintained b~tween the runner~ an~ the ~rapers ~uch that a uniform thic~ness of paving material in the windrow ~which could be zero~ can pass under the ~onveyor. Having runner~ on either ~d~ of the conveyor head in~epen~ntly controllin~ ~craper~ on each side providec for variation~ in the grade of the surface to be paved.
The invention contemplates the additional feature that the conveyor has a drag chain which rolls over a ~eries of shafts, including one at e3ch end of the conveyor, and ~ 3 ~
~upposted by an idlsr ~haft located forward and above the conveyor ~haft at the inlet en~ of the conveyor. ~ecause of the location o this idler shaft, the ~rag chain ~oe~ not completely raver~e ~irection~ aroun~ the shaft ~t the inlet ~nd, but merely m~ke~ ~ 90~ turn. Thus, ~he ~rag chain travels at ~bout a d5~ angl~ to the road ~ur~Dce ~ has a more efficient motion against the loo~e paving material in the windrow. This mo~ion also reduces the Yibration an~ slapping of the paddl~s agai~st the windrow.
Other aspects of this invention are as ~ollows:
A paver ~apable of picking-up a windrow of paving material from the ground, the paver comprising:
a self-propelled chassis having a forward end and a rear end;
a pick-up means pivotally supported on the forward end of the cha6si~ capable of conveying paving material from outside the ~hassi~ and depositing it in th~ chassis; and means for carrying the paving material deposited in the chassis to the ground near the rear end of the chassis;
means supp~rted on the rear end of ~he chassis for producing a road surface from paving material deposited on the ground;
wherein the pick-up means is pivotally supported to pivot in two dimensions relative to the chassis.
A paver capable of picking-up a windrow of paving material from the ground, the paver comprising:
a self-propelled chassis having forward and rear ends;
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a lifting conveyor pivotally supported on the chassis, the lifting conveyor having an input end and a discharge end, the lifting conveyor comprising a pan and a drag chain, the drag chain supported on one shaft near each end, and an additional shaft above and forward of the shaft near the input end;
means for carrying the paving material From the discharge end of the lifting conveyor to the ground near the rear end of the chassis;
means supported on the rear end of the chassis for producing a road surface from paving material deposited on the ground.
A paver capable of picking-up a windrow of paving material from the ground, the paver comprising:
a self-propelled chassis having a forward end and a rear end;
conveyor means pivotally supported on the forward end of the chassis capable of conveying paving material from a windrow to the chassis;
means for conveying paving material in the chassis to the ground near the rear end of the chassis;
me3ns ~upported on the rear end nf the chassis for producing a road surface from the paving material deposited on the yround;
runner means attached to the conveyor means capable o~
being fi~ed at a predetermined distance below the conveyor;
wherein the runner means prohibits the conveyor from rPsting on the ground; and at least one scraper means attached to the conveyor means to prohibit paving material from passing beneath the conveyor meansO
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A paver capable of picking-up a windrow of paving material from the ground, the paver comprising:
a self-propelled chassis having a forward end and a rear end;
conveyor means pivotally supported on the forward end of the chassis capable of conveying paving material in a windrow to the chassis;
means for conveying paving material in the chassis to the ground near the rear end of the chassis;
means ~upported on the rear end of the ~hassis for producing a road ~urface from the paving material de~osited on the ground;
runner means for riding on the qround, the runner means attached to the conveyor means such that it can float relative to the ground; and, scraper means movea~ly attached to the conveyor means and communicating with the runner means such that the scraper means floats with the runner means;
whereby the distance betwe~en the scraper means and the ground is maintained constant.
A paver capable of picking-up a windrow of paving material from the ground, the paver comprising:
a self-propelled chassis having a forward end and a rear end;
conveyor means pivotally supported on the forward end of the chassis capable of conveying paving material in a windrow to the chassis;
means supported on the rear end of the chassis for producing a road surface from the paving material deposited on the ground;
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scraper means moveably attached to the conveyor means to restrict at least a portion of the paving material from passing under the conveyor means;
grade control means capable of riding along the ground, the grade control means communicating with the scraper means and maintaining the scraper mean~ at a predetermined height above the ground.
A method of paving a road with paving material in a windrow utilizing a self-propelled ~hassis having a forward end supporting a conveyor means capable of picking-up paving material from a windrow and depositing it in the chassis, the conveyor means being adjustable to the grade of the ground by conveyor means adjustment means, and the chassis also having a rear and supporti~g means for producing a road surface from paving material deposited on the ground, the method comprising the ~tep~ of:
æensing the grade of the ground relative to the conveyor means;
communicating any divergence between the ground grade and the conveyor means to the conveyor means adjustm~nt means;
actuating the conveyor means adjustment means to minimize the divergence.
A method of paving a road with pavin~ material laid in a winærow utilizing a self-propelled chassis having a forward end supporting a conveyor means capable o~ picking-up paving material from a windrow and depositing it in the chassis, and the chassis having a rear end supporting means for producing a road surface from paving material deposited on the ground, the method comprising the steps of:
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counterbalancing a portion of the downward force of gravity acting on th~ conveyor means; and supporting the c~nveyor means off the ground by run~er means capable of sliding along the ground.
A meth~d of paving a road with paving material laid in a windrow utiliziny a ~elf-propelled chassis having a forward end ~upporting a conveyor means capable of picking-up paving material from a windrow an~ depositing it in the chassis, and ~he chassis having a rear end supporting means for producing a road surface from paving material deposited on the ground, the method comprising the steps of:
supporting the convPyor means off the ground by runner means oapable of sliding along the ground and also oapable of vertical movement selative to the conveyor means; and providing ~raper means attached to the conveyor means, ~he soraper means capable of vertical movement relative to the conveyor means, said ~eraper mea~s movement oorrespDnding to the movement of the runner means.
supporting the conveyor means off the ground by runner means capable of sliding along the ground and also capable of vertical movement Yelati~e to the conveyor means; a~d providing ~craper means att2ched to the con~eyor means, the ~raper means capable of Yartical movcment relative to the conveyor means, ~aid Scraper mean~ ~oYement correspon~ing to the moveme~t of the run~er meun~
A pick-up apparatus adapted to transfer at least a portion of a windrow of paving material from the ground to a paver, the pick-up compri~ing:
a chassis;
7d ~ 3 ~
a conveyor at least partially supported on the chassis;
scr~per means attached to the conveyor to prohibit passage of paving material from under at least ~ portion o~ the conveyor, the scraper means capable of rearward mov~ment relative to the conveyor upon application o~ at least a predet~rmin~d force.
A pick up apparatus adapted to txansfer at least a portion o~ a windrow of paving material from the ground to a paYer ~ the pick-up comprising:
a chassis;
a conveyor at least partially supported on the chassis;
scraper means pivotally attached to the conveyor and projecting downwardly from the conveyor to prohibit passage of paving material from under at least a portion of the conveyor, the scraper means capable of rearward movement relative to the conveyor upon application of at least a predetermined force, the scraper means secured against the :Eorce by a break-away pin, the scraper means baing biased downward to engage the ground; and ground engaging means communicating with the conveyor and at least partially supporting the conveyor, the ground-engaging means being adjustable to vary the height of the conveyor above the ground.
A pick-up apparatus adapted to transfer at least a portion of a windrow of paving material ~rom the ground to a paver, the pick-up comprising:
a chassis;
a conveyor piYotally supported on the chassis;
7e transverse conveyor means attached to the conveyor to move windrow material from a position transversely outside the conveyor to the conveyor;
scraper means attached to the transverse conveyor to prohibit passage of material from under at least a portion of the transverse conveyor means;
wherein the scrap~r means is biased downward to engage the ground.
A pick~up apparatus adapted to transfer at least a portion of a windrow of paving material from the ground to a paver, the pick-up comprising:
a chassis;
a con~eyor pivotally supported on the chassis;
a screw conveyor attached to the conveyor to move windrow material ~rom a position tran~verse the conveyor to the conveyor;
scraper means pivotally connectad to the screw conveyor to prohibit passage of material from under at least a portion of the screw conveyor, the scraper means being biased downward to engage the ground, the scraper means being secured against rearward movement by a break away pin that will release upon application of at least a predetermined force; and ground engaging means at least partially supporting the conveyor, the ground engaging means being adjustable to vary the height of the conveyor.
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FIG. 1 i~ a ~ide elevational view of the paver of the present invention.
FIG. 2 is a top plan view of the paver o the present invention with screed portion removed.
FIG. 3 is a f ront elevation~l view of the paver o FIG. 1 with guard and cover removed.
FIG. 4 is a f ront elevational view of the present invention with the ~on~eyor removed to expo~e the eonveyor mounting.
FIG. 5 i~ a ~ide elevationl31 YieW of the input end of the lifting ~onveyor partially cut-laway showing an alternative embodiment of the present invention.
. ~ 7g " ~
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FIG. 6 i~ a sectional view of the alternative embodi~ent shown in FIGo 5 ta~en at ~ection line 6-6.
FIG. 7 is a side elevational Yiew of a s2cond alternative embodiment of the prasent invention.
FIG. 8 ~how~ the d~taile~ ~ide elevational Yiew of the ~raper of FIG. 7.
PIG. 9 is ~ front elevation of a ~craper brace for the scraper shown in FIG. B.
FIG. 10 ~hows a side eleYational vie~ o~ the ~craper brace of FI~. 9.
~ IG. 11 ~how a sid~ elevational view o~ the break-away scraper of FIG. B.
FIG. 12 shows a front elevational YieW of the break-away scraper of FIG. 11.
FI~. 13 ~hows a 3ide elevational vi~w of a third ~lternative embodiment o the present invention.
FIG. 14 show~ a rear ele~ation~ w of the embodiment o~ FIG. 13.
FIG. 15 ~hows a schematic diagram of the control ~ystsm of the ambodiment shown in FIGS. 13 and 14.
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Q ~'ol~LI~ L~CQF T~E I~E~TIQ~
The integrate~ paver of the present invention ~nd its component parts may be understood by reference to the diagram~
described abov~. Referring ir~t to FIGS. 1 4, the paver is generally designate~ as 20. The paver ~0 i~ compri6e~ of three gener~l component~: the ~h~s~is 2~, the scread 24 ~nd the conveyor 26. The screed is secured to the paver in a manner known in the art at the rear end of th2 paver. ~creed connector bars 28 secure the screea in a position behind the paver such that it c~n produce a road ~urface 30 fr~m loose pavin~ material 32 depo~ited behind the paver.
The chassi~ is supported on wheels 34 and is Relf-propelled by a power system contained within the chassis.
Of course, the unit could also be ~upported on tracks or utilize any other me~ns known in the art for mo~ing large machines. The operator of the unit æit~ on the operator' 8 chair 36 from where he can direct the paver by ~teering wheel 38 and can control the hydraulic an~ other controls on console 40 to fully operate the paver.
Th~ con~eyor 26 is pivot~lly attached to the ront of the chassi~ 22 at pivot connections 42 shown ~t FIGS. 1 and 4.
However, the conveyor i8 not ~irectly connected to the chassis at pivot connsctor 42, but to a mounting 44 which i8 in-turn ~ivotally connected to the chassi~ at pivot connector 46. This pivot connector allows the mounting 44 to be swung from ide to side ~hereby adjusting the conveyor relati~e ~o the chassis in the direction of the grade of the road. Preferably, the mounting 44 (and in turn the conveyor 26~ can be adjusted 4 in 13~9~
either direction rom the normal relative to the chassis.
Alt~rnativ~ly, ma~imum qrade ~dju~tmants of a yr~ater or less ~ngle is ~o~t~mplated b~ t~e invention.
The conveyor, gene~ally, ha6 two ends; a discharge end 48 and ~n inlet end 50. The discharge end is the high end of ~he conveyor at which the 1008e paving material i8 di~charged into the chas~is. It has a ~ha~t 52 that i~ dr~ven by motors 54 to ~ctuate drag chain 56 in the conveyor. A ~econd shaft 58 and a third sha t 59 both passi~ely ~u~port the dray chain as it tra~els the length of the conveyorO An ~dler ~haft 60 is satuate~ above ~nd in front of conveyor shaft 58 and carries the drag chain 56 in front of the shaft 5B ~uch that the drag chain makes only a 30 change in direction aroun~ ~haft 58.
Accordingly, the drag chain paddles 62 interce~t tha windrow of paving material 64 at about a 45 angle and do not ~egin to ch~nge diraction until reachinq the middle of ~r~ve ~haft 58, at which point they change direction i~ order to r~turn to drive shaft 52. This ~rrangement reduces v~bration~ normally caused when the paddle of the drag chain completely reverses direction (by 180) around ~ha~t 58 at the same tame the paddles come in contact with the paving ~aterial in the windrow 64. Also, the ~lapping action of the paddle 62 ~gainst the wind sow 64 is reduced.
The tilt of the conYeyor 26 r~lative to the cha sis 22 is ~ontrolled by hydrauli~ cylindar 66 shown in the lowered position (shown fully estendea as 6~ in a typical orientation for transport of the pa~er 20). ~rade ad~usting hydraulic cylinders 70 (shown in FIG. 4) are attached between the chassis and the mounting in order to control the grade adjustment of the con~eyor relatiYe to the chassi~. Second hydraulic 1~
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cylinders 70 can e~pand or contr~ct in or~er to effect up to a 4~ ~wing ~n eith~r ~irectioD r~lative to the chassi~. This allows for aaju~tm~nt o~ the conveyot to the gr~de of the road up to 4 di~ferent from the plane of the ehassi~.
The inlet end of the cs~n~eyor hEI~ ~ wldelled are~ 72 on both sides of the ~rag chain S6. l`hi~ ~llow8 or the drag chain to ~onvey material ~ror~ the win~row 64 which i5 wider thal~ th~ w$dth o~E the ~ir~g chain 56. The collveyor ~haft 58, which is turned by the movement of the ~rag chain 56, has 6crew conYeyors 74 e:ctsnding the wiath of w~ dlened portion~ 72 . These screw con~reyors 741 ~onvey the paving material in the windrow which i6 on the sides of the ~indrow and which would not be conveyed directly by drag chain 56. A~ the screw conveyors 74 turn they çonvey the material in the widle part o the windrow that reaches th~ inlet 2n~ of- th~ comv~3yor to~ards thg3 drag s:h~in where it i~ then conveyed up the eonveyor toward the discharge end 48.
The inlat end of the conveyor has side walls 76 asld e:l~tending wing 78. Th~ e~tended wing 73 acts as a funnel to scoop ~?aving material ;nto the inlet end whic:h ~ould not oth~rwi~e bl3 picke~ up by the inlet end of th2 con~reyor. These wings 78 are piYotally sttached tD the inlet ~ide walls 76 at hinge 80.
grad.e 8~n~0r 82 i~s loe~ted at both B~d~ wall~ and ~ as flat bottom portion 84 which rides along the road surface.
The grada control is pi~otally sup~orted on rocker arm 86 which control~ th~ hydrauli~ cyllncler~ 68 and 70. I the road surface increases in height relative to the conveyor, the grade control 82 will move up~ard and will cause the c:ylirlder 68 to ~ 3 ~
raiæe the conveyor &uch that ths conveyor head is as near to the road ~urface ~6 possible~ without undue ~crapin~ of ths road surface.
The two grade ~ansors 82 at laast partislly ~utomatically control th~ ~rad~ and tilt of the con~ror rel~tivQ to the cha~ . The ~ra~e 6ensor 82 on one ~ide will control the tilt of ~he conveyor by ~utomatic~lly adjusting hydr~ulic cylin~er 68. The gra~e ~en~or B2 on the oppo~ite sida will control the grade of ths conveyor relative to th~
chas~i6 by a~ju~ting hydrsulic ~yli~der 70 which con~rol the t~lt of the mount upon which the conveyor is supported. As mentioned previously the grade control ~referably allows a pivot of up to 4 in either direction.
The present invention contemplats alter~atiYe ways of assuring that pav~ment material in the windrow does not pass under the conveyor head. While the absve-d0scribed embodiment utiliz~s grade coDtrols to cau~e yr~lde and tilt sdjustments in two dimensions at the connection of the cha sis with the conYeyor, an alternative method, alsD controlling the conveyor at ~ts ~onnection to the chassis i~ contemplated.
With reference to FIGS. 5 and 6, rear scraper 9O is attached through li~kage 92 to the ~onveyor such tha~ it will ride a~jac~nt th0 groun~. 2unner 94 which r~des on the ground a~ the ~onveyor i~ moved orward, is fi~ed at a predetermined ~istance with re~pect to the conveyor head such tha~ pressure on the conveyor toward the ground will press the runner g4 against the groun~ but avoid scraping the conveyor head. The runner g4 is attached to a side gate 96 and side gate linkage 98 which assure~ that the runner 94 is maintained parallel to the ground.
1~ 3 ~ 3 The hy~raulic cylinder 68 and pivotal connection ~2 ~an ~e u~ed to apply ~ ~ounterbalance force again~t gravity of the ~onv~yor heaa to~ar~ th~ ground. 8pecific~11y, runner 9q i~ attached to the bottom of ~ide gate plate 96 which is connected through an armature 104 to triangular pivot pl~te 106 whi~h is in-turn piYotally connected to the conveyor ~t pivot 102. The tria~gulDr pivot point 106 ~8 connected at it~
opposit~ point to sd~u~ta~le arm 100 which 1~ connected to the side gate plate 96. ~c~ordingly, e~ten~ion of adjustable arm 100 will pi~ot plate 106 an~ re-position the gate 96 and runn~r 94, always ~eeping runner 94 parallel with the ground.
When cyl~nder 68 is ~eing used to apply B
counterbalance orce, cylinder 70 is put in a ~ree float position E0 that the conveyor head is free to pivot about pivotal connection 46. Thls ensure~ that the head will follow any transvers~ grade change~ of the ground.
While gravity is used to push the conveyor head against the ground, the ru~ner 94 msintain~ the head slightly above the sur~ace of the ~round to avoid scrapin~ the scraper 90 again~t th~ ground, ~ut whil~ maintainins the scraper 9~ as ~lose to th~ ground a~ possibls. However, it is desirable to apply a force at hydraulic cylin~er 68 t~ ~ounterbalanee gravity forces which could be as much as 4000 lbs. at the point of the con~yor head against the runner, 80 that the runner 94 i~ only gently pushed along the ground. ~uch hydraulic force can be applied to relieve sny amount of the gravity pr~sure but, preferably, allows a minimal amount of gravity to keep the head against the ground ~urface.
~ 3 ~
As an alternative to scraper 90, a break-away scraper arrangement as shown in FIGS. 7 and 8 can be employed. Such a scraper i8 attached to the ~onveyor 26 by braeket 108 which is attached along on~ edge to the ~onveyor and aeparts downwardly away from the underside o~ the conveyor. A scraper bracket 110 (also 6hown ~n FIGS. 9 and 10) i6 pivotslly atta~hed to bracket 108 at bolt 112 such that it can pivot up and ~own as will be describe~ below. A brea~-away ~raper plata 114 i~ in-turn pivotally attached to ~craper bracket 110 at bolt 116 and also at break-away point 118. Break-away ~late 114 ha~ curYed ~ur~ace 120 which will ~upport a curv~d plate on two cross ~upports 122 and 124 (as shown in FIGS. 11 and 12).
In the svent that the ~craper ~hown in FIGS. 7-12 collides with a hidden object in the windrow, the break-away seraper plat~ 114 will be forced rearwar~ly, ehearing the ~mall diametar shearing bolt at 118l ~nd frsely pivoting about the bolt at 116. Accordingly, a colli~ion of the scraper with such a hidden, im~ovabl~ object will not: cause damage to the conveyor, or possibly, injury to the operator, but will only causs the ~hearin~ o~ the bolt at 118.
The ~econd 6trategy contempl~ted by the present inve~tion for avoiding.paving material passing by the conveyor head as airected to maintal~ing a ~et di~tance ~possibly zero) between the runner 94 and the scraper face 120. This is accompli~he~ by a linkage p~ate 126 (FIG. 7) which connects ~ate plate 96 ~ith ~craper bracket 110 at slidable connection 128. ~he linkage plate 126 is pivotally atta~hed to the conveyor at pivot hinge 130. Accordingly, mo~ement of the runner upwards or downwards (shown at phantom lines 132 in FIG. 7) will cau~e an appropriate movem~nt Df scraper plate ~ 3 ~
120. Accordingly, a predetermined di~tance between $he bottom of plate 120 and the runner 94 (Bet by a~justment of linkage 126 at sli~able co~nection 128) will be maintained while runner 94 movss up and ~own as it ride~ over the ground.
Nhen operating the adjustable gate as ~hown in FIG. 7, the break-away plate 120 can be set to ride eve~ with the bottom of the runner 94, as ~hown in FIG. 7, or raisea relative to the runner to allow a uniform mat o~ a pre~et~r~ined thicknes~ to be formed by the w raper 120 pas~i~g over ~he windrow.
In th;~ arrangeme~t, cyli~er 100A (Figure 7) replaces adjustable link 100 (o Figurs 5). 3y maintaining a pre-~elected hydraulic pressure to e~t~a cylin~er ~OOA, the downward forc~ of 6ide gate 96 ~nd runner 94 again~t the groun~
can be controlle~ to any desired value. In operation, the pre~sure is adjusted so that the downward ~orce iæ just ~ufficient to hold runner 94 against thç ground, thereby holding ~craper 1~0 in a ~i~ed relation to the ground through linkage 126.
The third 6trategy for avoiding paving material passing by the con~eyor head i~ to control the di~tance between a ~cra~er f~c~ 120 ~n~ th~ grouna ~y m~an~ o a qr~de ssnsor 82A tFigures ?3 and 14~ with 1at bottom portion 84~ that rides along the rond sur~ace~ ~eferring to Figure 13, scraper bracket llOA is connected to the conveyor 26 through pivot 112. ~cr~per ~ace 120 i~ connected to llOA in ~ br~ak-aw~y fashion ~s previou~ly de~cribed. The height of scr3per face 120 from the grouDd is controlled by cylinder 100~ which can raise or lower bracket llOA and scraper ace 120 about pivot 112.
13 1~ ie3 There $~ a brack0t llOA with scrap~r face 120 pivotally moun~a on each side of the co~veyor~ generally behind the ~crew ~ec~.io~ 74 and arrangea to clear a path ~or the wh~elæ 34 on e~ch side of th~ paver.
¢r~e s~nsor ~2A, wor~ing through arm 86~ operates a grade control devi~e 133, ~uch as ~ rotary hy~rnulic proportio~al valve, mounte~ to piqotlng brack~ llOA.
Proportio~al valve 133 controls hy~raul~c cylin~er lOOB to ~aintain the bott~m of s~raper ace 120 at any ~sirad ~istance above the bottom ~urfac8 84A of sensor 82A, ~hich is riaing on the road surace. The depth of material 10wi~g under scraper face 120, ~nd in the wh~el path of ths paver, i~ therzby co~trollea to a fi~ed hei~ht ~bova the road ~urface compensating for any irregularities in the fiurface.
~ n this ~rr~ngement the in:let ena o~ conve~or 126 is positioned at a ~onvenient distance above the ground ~urface by mean~ of cyl~nders 66. It i8 not nec~s~asy to also ~ivot the head about pivot 46 and cylinders ~0 can be used tc lock the head in ~ l~v~l po8~tio~. A~tern~tely, pi~ot 46 and cylinders 70 can be removed.
\
Hydr~ull~ cylinder lOOB i~ ~ontrolled by proportioning valve 133 a8 ~hown ~chematically in Figur~ 15. Proportioning valve 133 i~ ~uppl~ed with hydraulic oil at a ~on~tant, but adjustable pres~ure by hydraulic pump 134. Proportioning valve 133 respon~s to ~ovement of yround sensor 82~ through arm B5A, pas~ing hydraulic oll to hydraulic cylinder lOOB in proportion to the movement of arm ~6A in order to maintain a pre-selected vertical distance between the bottom of sensor 82A (shown by surface 84A~ and valve 133. Since ~alve 133 i8 mounted on lS
~ 3 ~
bracket 10aA with ~cr~per fsc~ 120, the vertical ~i~tan~e between the ~t'com o ~cr~per ~ace 120 an~ the ~roun~ i8 maintained at a pre-~el~cted di~tance. By adju~ting the rotational mounting of ~rm 86A at it~ attachment to valve 133, the h~ight o~ ~ralv~ 133 an~ ~craper aca 12~ f rom the ground can be adjuste~l to any ~e~i re~ ~istance.
One complete set compri~ed of a ~erl~or 82A, a br~cket 110A, a scraper face 120 an~ cyl~nder 100A carl be n~ourlted on sach 8iae of the ~a~chine to cle~r a p3th ~or both ~cha right and left ~ide wheels Or the paver. Thus, S~ae right ~nd lst sides are independ~ntly controlled by ~ensor~ on each ~l~e an~ grade adjustments between the right and left sides of the groun~ ara automatically made.
As described previously with respect to Fig. 1, it i~
also possible to maintain the height o~ the bottom of the cornplete conveyor 48 from the groundl by the use o grade sensors 82, on~ on each ~ide of the machine. In this arrangement one ~ensor 82 on one si~la of the m~chine con~rols cylinder 68 and on~ senQor 82 oll the other side of the machine ~ontrol~ cylinders 70, Figure 4. Sen~ors 82 control their r2spective ~ylinaer~ through proportional hy~aulic val~es ~imilar to the ~rrangement shown in Fiqure 15, with cylinder 68 ~or cyli~ders 70) 6ubstituted or cylinder 100B, and grade control 84 in Fig. 1 sub~titut2d ~or ~ensor B2 on one ~ide of the conveyor ~and the ~snsor 82 on the otber si~e controlling cylind~rs 70~.
From the above description i~ will be apparent that there is provided an improved paver with the desirable advantages described above, but which obviously is susceptible to modification in its form, method, operation, detailed ~ .
conxtruction an~ arrangement ~thout ~3epart~ q from the prin~iples inYolve~. It is to be understood that the invention i~ not limit~d to t~ 8peciiEit~ eature ~hown, but that the means, methoa ana construction herein disclo~ed comprise the preferred form of ~ eral modes o putt;ng tha in~ention into effect. The lnvention i~, th~r~fore, claimed im any o~ it~
forms or modificat~ons within th~ legitimats an~ ~alid ~;eope of th~s appenda~ claims.
INTEGRATED PAVER WITH WINDROW PIC~-UP CAPABILITY
BACKGROUND OF THE INVENTION
The invention relates to machines for paving roads.
In particular, the invention pertains to self-propelled paving machines capable of picking up windrow of loose paving material without the assistance of additional equipment.
In the past, pavers were independent machines which evenly distributed loose paving material from a holding bin or hopper in the paver to the xoad directly in front of a screed supported on the paver to produce a road surface from loose paving material. The loose material was previously dumped into the hopper or holding area of the paver by use of a dump truck or other separate apparatus. More recently, Astec Industries developed a "shuttle buggie" device, which is the subject of U.S.
Patent No. 4,818,139, issued April 4, 1989. The shuttle buggie transports paving material from a dump truck or a windrow to the paver and then discharges the paving material into the paver by way of a conveyor.
Employing a single machine to pick up loose paving material laid in a windrow and pave the surface over which the machine passes avoids the need for separate ~rindrow pick-up or "shuttle buggie'l machines. Prior attempts have been made to ~' :~3~9~
develop such æ combined pick-up and paving ~evlce, suGh as that ~hown in ~he Babl~r U.S. Patent No. 4,200,408 (a similar device also was built by ~MI Corpora~ion).
The '408 patent shows a pavement laying apparatus equipped with an upwardly inclined ~hute hinge~ on a hopper front ~all and a conveyor ~upported on the ront of the paver.
This type of devi~e suffer~ from 6everal problems. First, any loose paving matarial which gets bayond the ~hute will travel beneath the wheels of th~ pav~r c~u~ing the pav~r to rise above th~ road surfaceO ~s the p~ver rises abov~ the r~ad ~urface, the ~hute will ~e carried to a higher level abovs the roa~
surface and ~llow yet more paving ~aterial ~rom the windrow to travel under the paver and r~ise the paver even further. This process will continue until ~ significant portion of the windrow is not picked up ky the shute and the paving function of the machine is ~eriously di~rupted.
A second problem with the Babler-type of paver is that it cannot adjust to the road grade relative to the rest of the paver, i.e. it is fi~edly ~ttached to the paver about that a~is. ~dditional problems include the fact that on the Babler-type paver, the 6hute and 1ight conveyor~ contained in the ~hute must be as wide as the windrow or, if not, gui~e plates are u~*d to funnel the windrow into the ~hute. Often these guide plate~ allow a significant amount of paving material u~derneath the shute or are lifted above the ground when the paver rolls o~er loose material which passes under the conveyor, Another problem apparent in the Babler device is the danger of the ~hut~ ~iolently colliding with a hidden ~L 3 ~
obstruction. Fot eacample, the 13abler ~aver ~ould vivlently collid2 with ~ manhole c:over buried under a windrow o~ paving material causlng dan~age to ~che ~hute or other parts of the paver and, pos~ibly, injury to the operator.
It i~ an object of the pre~ent i~vant~on to provi~e an impro-ted integrated pavar havillg wlndrow pick-up ~apability.
I'c is ~nother object of the pre~0nlt invention to provide a paver havin~ front ~pp~ratu~ for picking-up ~ win~row of pa~ing matl3rial and ~epo~ting it ~nto th~ paver, the i~ront appar~tu~ having the ability to pivot to adjust for both ti ït and grade ad~iustment~ relati~re to th~ re~t of the paver.
It is yet ~nother object o~ thla present invention to provide ~ paver which can at least ~emi-automatis::ally adju~t the tilt o~ th~ corlv~yor relative to the paver in ~rde!r to avoid a gradual lifting of the paver off the road surace because of leakage o~ p~ving m~terial pa~t ths conveyor.
It i~ further an object o~ ths present invention to provide a c:or~veyor ~hich will not viole~tly collide with manhole covers or other sbstruction~ hidden in the windrow.
[t ~5 yet a3l~0ther object o~ the pre~ent inventiorl to provide a way of feeding a windrow which i~ wider than the conveyor into the ~o~veyor without the atltendant problem of using funrlelinq guides.
It is yet a further obje~l: of the pre~nt invention 'co provide a conveyor which will have reduced ~7ibrations and ~e more efficient in conv2ying the loo~e pavin~ material in the windrow into the paver hopper.
~ 3 ~
Other and ~urther objects will become apparent from the ollowi~g discussion o th~ inve~tion and it~ e~bodiments.
~U~R~ OF ~H~ I~V~TIO~
In accor~ance with thi~ invent~on~ a pa~r has a ~21f propelled chas~i~ that ha~ a hopp~r or hol~ing area for loo~e paving ~aterial. The cha~sis has a forwar~ end and a rear end; a li~ting conveyor is pivotally connected to the forward end of the ch~ssi~, and a pa~ing ~pparatus, normally a screed, i8 attached in a way known in the ~rt at the rear end o~ the chassis.
The lifting conveyor is pivotally ~upported on the forward end of the chas~is to be able to pivot in one or two ~ime~sions relative to the cha~sis. The conveyor is pivoted in two dimensions by pivotally supporting the conveyor on a mounting which 1~ pivotally support~d on the chassis about the line oF movement of the chassis to allow for grade adjustments relat~ve to the ch~ssi~. Hydraulic cylindsrs are attached rom the chas~i6 to ~oth th~ mounting ~nd the conveyor to efect adjustment~ for tilt and gra~e Y~riations.
~ he conveyor ha~ a discharg~ end located aboYe the hopper and an input end ~djacent the road surface. Th2 input end is associated with ~rious ~pparatus t~ feed as much of the windrow as ~0~6ible into the ~on~eyor and, ultimat~ly, i~to the paver hopper. The feed means includes ~crew conveyors located on either side of the i~put end of the conveyor to feed the ~3~
pavi~g material from the side6 o~ th0 win~row into the con~eyor. Thes0 w rew conveyor~ are driven by tho ~ha~t tha~
~upport~ ~he drag c~ai~ o~ the con~eyor near the input end.
When desired, ~crapers are attached behind the con~eyos at its inlet end. Th~ scrapers are piqotally ~d~u~table in a ~lurality of ~o~itions relative to the conveyor and act to ~crape the road ~urface ~8 clean as ~ossible of paving materi~l in order to reduce or el~minate ~scape of paving material under the lifting conYeyor.
In th~ event that loose paving material does travel past the ~crapers, the paver cha~si~ ~ill begin to ride lightly above the road sur~ace as it rolls over the material.
As mentionea pre~iou~ly, this can cause the entire pa~er including the conveyor to lift off the road ~urface and bscome less ef~ctive at pickinq up the loos~ paving mate~ial. ~5 mo~e pa~ing material 0scape~ the 6craper, the paver further raises above the road 6urface. As this ~ycle continue~, the conveyor becomes ~e~s an~ less ~ffective ~t picking-up the loose material in the windrow.
Two distinct strategie~ ars employe~ by.the present invention to a6~ure that the conveyor head i8 properly orianted to the surface to be paved. First, the conveyor can be primarily controlled ~t its connection to the cha~sis. Or, altsrnatively, tha interface bstween the conveyor head and the road ~urface i8 controlled by scraper~ at the conveyor head.
Of cour~e, a combination of these two strategies could be utilized without departing from the presently contemplated invention.
1 3 ~
With respect to the ir~t ~tr~tegy, the ~onveyor head ~8S gr~da ~80r8 0~ either ~ide of the conYeyor which ride along ~h~ road ~urface. One o4 the~e grade ~ensors ~t lea~t ~artiall~ ~on~rols the tilt of the conveyor relative to the chassis, while ~he other at least partially controls the grade o ~h~ conveyor relative to th~ cha6sis. The qrade controls relay ln~ormation to the hy~raulic cylinder~ attachad between the conveyor an~ the cha~ to make adjustments to the conveyor in order to minimi~e escape o~ loose paving material past the ~onveyor head.
An alternative method within tbe first strategy to control the e~cape of paving material i8 to allow qravity to push the conveyor heaa against the ground. To avoid too much pressure being applied by gravity, hydraulic cylindars between the chas~is and the conveyor can counterbala~ce the gravity ~orc0s such that the hea~ ~till rides o~ the ground surface, but without undue ~res~u e against t:he ground.
With respect to the second ~trategy, ~crapers are attached to the conveyor head, the ~crapers being controlled by runners attached to the ~onveyor head which ride on the ground ~ur~ace. A predetermined 8pacing is maintained b~tween the runner~ an~ the ~rapers ~uch that a uniform thic~ness of paving material in the windrow ~which could be zero~ can pass under the ~onveyor. Having runner~ on either ~d~ of the conveyor head in~epen~ntly controllin~ ~craper~ on each side providec for variation~ in the grade of the surface to be paved.
The invention contemplates the additional feature that the conveyor has a drag chain which rolls over a ~eries of shafts, including one at e3ch end of the conveyor, and ~ 3 ~
~upposted by an idlsr ~haft located forward and above the conveyor ~haft at the inlet en~ of the conveyor. ~ecause of the location o this idler shaft, the ~rag chain ~oe~ not completely raver~e ~irection~ aroun~ the shaft ~t the inlet ~nd, but merely m~ke~ ~ 90~ turn. Thus, ~he ~rag chain travels at ~bout a d5~ angl~ to the road ~ur~Dce ~ has a more efficient motion against the loo~e paving material in the windrow. This mo~ion also reduces the Yibration an~ slapping of the paddl~s agai~st the windrow.
Other aspects of this invention are as ~ollows:
A paver ~apable of picking-up a windrow of paving material from the ground, the paver comprising:
a self-propelled chassis having a forward end and a rear end;
a pick-up means pivotally supported on the forward end of the cha6si~ capable of conveying paving material from outside the ~hassi~ and depositing it in th~ chassis; and means for carrying the paving material deposited in the chassis to the ground near the rear end of the chassis;
means supp~rted on the rear end of ~he chassis for producing a road surface from paving material deposited on the ground;
wherein the pick-up means is pivotally supported to pivot in two dimensions relative to the chassis.
A paver capable of picking-up a windrow of paving material from the ground, the paver comprising:
a self-propelled chassis having forward and rear ends;
~3~9~
a lifting conveyor pivotally supported on the chassis, the lifting conveyor having an input end and a discharge end, the lifting conveyor comprising a pan and a drag chain, the drag chain supported on one shaft near each end, and an additional shaft above and forward of the shaft near the input end;
means for carrying the paving material From the discharge end of the lifting conveyor to the ground near the rear end of the chassis;
means supported on the rear end of the chassis for producing a road surface from paving material deposited on the ground.
A paver capable of picking-up a windrow of paving material from the ground, the paver comprising:
a self-propelled chassis having a forward end and a rear end;
conveyor means pivotally supported on the forward end of the chassis capable of conveying paving material from a windrow to the chassis;
means for conveying paving material in the chassis to the ground near the rear end of the chassis;
me3ns ~upported on the rear end nf the chassis for producing a road surface from the paving material deposited on the yround;
runner means attached to the conveyor means capable o~
being fi~ed at a predetermined distance below the conveyor;
wherein the runner means prohibits the conveyor from rPsting on the ground; and at least one scraper means attached to the conveyor means to prohibit paving material from passing beneath the conveyor meansO
~ 3 ~
A paver capable of picking-up a windrow of paving material from the ground, the paver comprising:
a self-propelled chassis having a forward end and a rear end;
conveyor means pivotally supported on the forward end of the chassis capable of conveying paving material in a windrow to the chassis;
means for conveying paving material in the chassis to the ground near the rear end of the chassis;
means ~upported on the rear end of the ~hassis for producing a road ~urface from the paving material de~osited on the ground;
runner means for riding on the qround, the runner means attached to the conveyor means such that it can float relative to the ground; and, scraper means movea~ly attached to the conveyor means and communicating with the runner means such that the scraper means floats with the runner means;
whereby the distance betwe~en the scraper means and the ground is maintained constant.
A paver capable of picking-up a windrow of paving material from the ground, the paver comprising:
a self-propelled chassis having a forward end and a rear end;
conveyor means pivotally supported on the forward end of the chassis capable of conveying paving material in a windrow to the chassis;
means supported on the rear end of the chassis for producing a road surface from the paving material deposited on the ground;
7b 1 3 ~
scraper means moveably attached to the conveyor means to restrict at least a portion of the paving material from passing under the conveyor means;
grade control means capable of riding along the ground, the grade control means communicating with the scraper means and maintaining the scraper mean~ at a predetermined height above the ground.
A method of paving a road with paving material in a windrow utilizing a self-propelled ~hassis having a forward end supporting a conveyor means capable of picking-up paving material from a windrow and depositing it in the chassis, the conveyor means being adjustable to the grade of the ground by conveyor means adjustment means, and the chassis also having a rear and supporti~g means for producing a road surface from paving material deposited on the ground, the method comprising the ~tep~ of:
æensing the grade of the ground relative to the conveyor means;
communicating any divergence between the ground grade and the conveyor means to the conveyor means adjustm~nt means;
actuating the conveyor means adjustment means to minimize the divergence.
A method of paving a road with pavin~ material laid in a winærow utilizing a self-propelled chassis having a forward end supporting a conveyor means capable o~ picking-up paving material from a windrow and depositing it in the chassis, and the chassis having a rear end supporting means for producing a road surface from paving material deposited on the ground, the method comprising the steps of:
~3~L9~
counterbalancing a portion of the downward force of gravity acting on th~ conveyor means; and supporting the c~nveyor means off the ground by run~er means capable of sliding along the ground.
A meth~d of paving a road with paving material laid in a windrow utiliziny a ~elf-propelled chassis having a forward end ~upporting a conveyor means capable of picking-up paving material from a windrow an~ depositing it in the chassis, and ~he chassis having a rear end supporting means for producing a road surface from paving material deposited on the ground, the method comprising the steps of:
supporting the convPyor means off the ground by runner means oapable of sliding along the ground and also oapable of vertical movement selative to the conveyor means; and providing ~raper means attached to the conveyor means, ~he soraper means capable of vertical movement relative to the conveyor means, said ~eraper mea~s movement oorrespDnding to the movement of the runner means.
supporting the conveyor means off the ground by runner means capable of sliding along the ground and also capable of vertical movement Yelati~e to the conveyor means; a~d providing ~craper means att2ched to the con~eyor means, the ~raper means capable of Yartical movcment relative to the conveyor means, ~aid Scraper mean~ ~oYement correspon~ing to the moveme~t of the run~er meun~
A pick-up apparatus adapted to transfer at least a portion of a windrow of paving material from the ground to a paver, the pick-up compri~ing:
a chassis;
7d ~ 3 ~
a conveyor at least partially supported on the chassis;
scr~per means attached to the conveyor to prohibit passage of paving material from under at least ~ portion o~ the conveyor, the scraper means capable of rearward mov~ment relative to the conveyor upon application o~ at least a predet~rmin~d force.
A pick up apparatus adapted to txansfer at least a portion o~ a windrow of paving material from the ground to a paYer ~ the pick-up comprising:
a chassis;
a conveyor at least partially supported on the chassis;
scraper means pivotally attached to the conveyor and projecting downwardly from the conveyor to prohibit passage of paving material from under at least a portion of the conveyor, the scraper means capable of rearward movement relative to the conveyor upon application of at least a predetermined force, the scraper means secured against the :Eorce by a break-away pin, the scraper means baing biased downward to engage the ground; and ground engaging means communicating with the conveyor and at least partially supporting the conveyor, the ground-engaging means being adjustable to vary the height of the conveyor above the ground.
A pick-up apparatus adapted to transfer at least a portion of a windrow of paving material ~rom the ground to a paver, the pick-up comprising:
a chassis;
a conveyor piYotally supported on the chassis;
7e transverse conveyor means attached to the conveyor to move windrow material from a position transversely outside the conveyor to the conveyor;
scraper means attached to the transverse conveyor to prohibit passage of material from under at least a portion of the transverse conveyor means;
wherein the scrap~r means is biased downward to engage the ground.
A pick~up apparatus adapted to transfer at least a portion of a windrow of paving material from the ground to a paver, the pick-up comprising:
a chassis;
a con~eyor pivotally supported on the chassis;
a screw conveyor attached to the conveyor to move windrow material ~rom a position tran~verse the conveyor to the conveyor;
scraper means pivotally connectad to the screw conveyor to prohibit passage of material from under at least a portion of the screw conveyor, the scraper means being biased downward to engage the ground, the scraper means being secured against rearward movement by a break away pin that will release upon application of at least a predetermined force; and ground engaging means at least partially supporting the conveyor, the ground engaging means being adjustable to vary the height of the conveyor.
:l 3 ~
FIG. 1 i~ a ~ide elevational view of the paver of the present invention.
FIG. 2 is a top plan view of the paver o the present invention with screed portion removed.
FIG. 3 is a f ront elevation~l view of the paver o FIG. 1 with guard and cover removed.
FIG. 4 is a f ront elevational view of the present invention with the ~on~eyor removed to expo~e the eonveyor mounting.
FIG. 5 i~ a ~ide elevationl31 YieW of the input end of the lifting ~onveyor partially cut-laway showing an alternative embodiment of the present invention.
. ~ 7g " ~
t3~ 9~
FIG. 6 i~ a sectional view of the alternative embodi~ent shown in FIGo 5 ta~en at ~ection line 6-6.
FIG. 7 is a side elevational Yiew of a s2cond alternative embodiment of the prasent invention.
FIG. 8 ~how~ the d~taile~ ~ide elevational Yiew of the ~raper of FIG. 7.
PIG. 9 is ~ front elevation of a ~craper brace for the scraper shown in FIG. B.
FIG. 10 ~hows a side eleYational vie~ o~ the ~craper brace of FI~. 9.
~ IG. 11 ~how a sid~ elevational view o~ the break-away scraper of FIG. B.
FIG. 12 shows a front elevational YieW of the break-away scraper of FIG. 11.
FI~. 13 ~hows a 3ide elevational vi~w of a third ~lternative embodiment o the present invention.
FIG. 14 show~ a rear ele~ation~ w of the embodiment o~ FIG. 13.
FIG. 15 ~hows a schematic diagram of the control ~ystsm of the ambodiment shown in FIGS. 13 and 14.
~ 3 ~
Q ~'ol~LI~ L~CQF T~E I~E~TIQ~
The integrate~ paver of the present invention ~nd its component parts may be understood by reference to the diagram~
described abov~. Referring ir~t to FIGS. 1 4, the paver is generally designate~ as 20. The paver ~0 i~ compri6e~ of three gener~l component~: the ~h~s~is 2~, the scread 24 ~nd the conveyor 26. The screed is secured to the paver in a manner known in the art at the rear end of th2 paver. ~creed connector bars 28 secure the screea in a position behind the paver such that it c~n produce a road ~urface 30 fr~m loose pavin~ material 32 depo~ited behind the paver.
The chassi~ is supported on wheels 34 and is Relf-propelled by a power system contained within the chassis.
Of course, the unit could also be ~upported on tracks or utilize any other me~ns known in the art for mo~ing large machines. The operator of the unit æit~ on the operator' 8 chair 36 from where he can direct the paver by ~teering wheel 38 and can control the hydraulic an~ other controls on console 40 to fully operate the paver.
Th~ con~eyor 26 is pivot~lly attached to the ront of the chassi~ 22 at pivot connections 42 shown ~t FIGS. 1 and 4.
However, the conveyor i8 not ~irectly connected to the chassis at pivot connsctor 42, but to a mounting 44 which i8 in-turn ~ivotally connected to the chassi~ at pivot connector 46. This pivot connector allows the mounting 44 to be swung from ide to side ~hereby adjusting the conveyor relati~e ~o the chassis in the direction of the grade of the road. Preferably, the mounting 44 (and in turn the conveyor 26~ can be adjusted 4 in 13~9~
either direction rom the normal relative to the chassis.
Alt~rnativ~ly, ma~imum qrade ~dju~tmants of a yr~ater or less ~ngle is ~o~t~mplated b~ t~e invention.
The conveyor, gene~ally, ha6 two ends; a discharge end 48 and ~n inlet end 50. The discharge end is the high end of ~he conveyor at which the 1008e paving material i8 di~charged into the chas~is. It has a ~ha~t 52 that i~ dr~ven by motors 54 to ~ctuate drag chain 56 in the conveyor. A ~econd shaft 58 and a third sha t 59 both passi~ely ~u~port the dray chain as it tra~els the length of the conveyorO An ~dler ~haft 60 is satuate~ above ~nd in front of conveyor shaft 58 and carries the drag chain 56 in front of the shaft 5B ~uch that the drag chain makes only a 30 change in direction aroun~ ~haft 58.
Accordingly, the drag chain paddles 62 interce~t tha windrow of paving material 64 at about a 45 angle and do not ~egin to ch~nge diraction until reachinq the middle of ~r~ve ~haft 58, at which point they change direction i~ order to r~turn to drive shaft 52. This ~rrangement reduces v~bration~ normally caused when the paddle of the drag chain completely reverses direction (by 180) around ~ha~t 58 at the same tame the paddles come in contact with the paving ~aterial in the windrow 64. Also, the ~lapping action of the paddle 62 ~gainst the wind sow 64 is reduced.
The tilt of the conYeyor 26 r~lative to the cha sis 22 is ~ontrolled by hydrauli~ cylindar 66 shown in the lowered position (shown fully estendea as 6~ in a typical orientation for transport of the pa~er 20). ~rade ad~usting hydraulic cylinders 70 (shown in FIG. 4) are attached between the chassis and the mounting in order to control the grade adjustment of the con~eyor relatiYe to the chassi~. Second hydraulic 1~
1 3 ~
cylinders 70 can e~pand or contr~ct in or~er to effect up to a 4~ ~wing ~n eith~r ~irectioD r~lative to the chassi~. This allows for aaju~tm~nt o~ the conveyot to the gr~de of the road up to 4 di~ferent from the plane of the ehassi~.
The inlet end of the cs~n~eyor hEI~ ~ wldelled are~ 72 on both sides of the ~rag chain S6. l`hi~ ~llow8 or the drag chain to ~onvey material ~ror~ the win~row 64 which i5 wider thal~ th~ w$dth o~E the ~ir~g chain 56. The collveyor ~haft 58, which is turned by the movement of the ~rag chain 56, has 6crew conYeyors 74 e:ctsnding the wiath of w~ dlened portion~ 72 . These screw con~reyors 741 ~onvey the paving material in the windrow which i6 on the sides of the ~indrow and which would not be conveyed directly by drag chain 56. A~ the screw conveyors 74 turn they çonvey the material in the widle part o the windrow that reaches th~ inlet 2n~ of- th~ comv~3yor to~ards thg3 drag s:h~in where it i~ then conveyed up the eonveyor toward the discharge end 48.
The inlat end of the conveyor has side walls 76 asld e:l~tending wing 78. Th~ e~tended wing 73 acts as a funnel to scoop ~?aving material ;nto the inlet end whic:h ~ould not oth~rwi~e bl3 picke~ up by the inlet end of th2 con~reyor. These wings 78 are piYotally sttached tD the inlet ~ide walls 76 at hinge 80.
grad.e 8~n~0r 82 i~s loe~ted at both B~d~ wall~ and ~ as flat bottom portion 84 which rides along the road surface.
The grada control is pi~otally sup~orted on rocker arm 86 which control~ th~ hydrauli~ cyllncler~ 68 and 70. I the road surface increases in height relative to the conveyor, the grade control 82 will move up~ard and will cause the c:ylirlder 68 to ~ 3 ~
raiæe the conveyor &uch that ths conveyor head is as near to the road ~urface ~6 possible~ without undue ~crapin~ of ths road surface.
The two grade ~ansors 82 at laast partislly ~utomatically control th~ ~rad~ and tilt of the con~ror rel~tivQ to the cha~ . The ~ra~e 6ensor 82 on one ~ide will control the tilt of ~he conveyor by ~utomatic~lly adjusting hydr~ulic cylin~er 68. The gra~e ~en~or B2 on the oppo~ite sida will control the grade of ths conveyor relative to th~
chas~i6 by a~ju~ting hydrsulic ~yli~der 70 which con~rol the t~lt of the mount upon which the conveyor is supported. As mentioned previously the grade control ~referably allows a pivot of up to 4 in either direction.
The present invention contemplats alter~atiYe ways of assuring that pav~ment material in the windrow does not pass under the conveyor head. While the absve-d0scribed embodiment utiliz~s grade coDtrols to cau~e yr~lde and tilt sdjustments in two dimensions at the connection of the cha sis with the conYeyor, an alternative method, alsD controlling the conveyor at ~ts ~onnection to the chassis i~ contemplated.
With reference to FIGS. 5 and 6, rear scraper 9O is attached through li~kage 92 to the ~onveyor such tha~ it will ride a~jac~nt th0 groun~. 2unner 94 which r~des on the ground a~ the ~onveyor i~ moved orward, is fi~ed at a predetermined ~istance with re~pect to the conveyor head such tha~ pressure on the conveyor toward the ground will press the runner g4 against the groun~ but avoid scraping the conveyor head. The runner g4 is attached to a side gate 96 and side gate linkage 98 which assure~ that the runner 94 is maintained parallel to the ground.
1~ 3 ~ 3 The hy~raulic cylinder 68 and pivotal connection ~2 ~an ~e u~ed to apply ~ ~ounterbalance force again~t gravity of the ~onv~yor heaa to~ar~ th~ ground. 8pecific~11y, runner 9q i~ attached to the bottom of ~ide gate plate 96 which is connected through an armature 104 to triangular pivot pl~te 106 whi~h is in-turn piYotally connected to the conveyor ~t pivot 102. The tria~gulDr pivot point 106 ~8 connected at it~
opposit~ point to sd~u~ta~le arm 100 which 1~ connected to the side gate plate 96. ~c~ordingly, e~ten~ion of adjustable arm 100 will pi~ot plate 106 an~ re-position the gate 96 and runn~r 94, always ~eeping runner 94 parallel with the ground.
When cyl~nder 68 is ~eing used to apply B
counterbalance orce, cylinder 70 is put in a ~ree float position E0 that the conveyor head is free to pivot about pivotal connection 46. Thls ensure~ that the head will follow any transvers~ grade change~ of the ground.
While gravity is used to push the conveyor head against the ground, the ru~ner 94 msintain~ the head slightly above the sur~ace of the ~round to avoid scrapin~ the scraper 90 again~t th~ ground, ~ut whil~ maintainins the scraper 9~ as ~lose to th~ ground a~ possibls. However, it is desirable to apply a force at hydraulic cylin~er 68 t~ ~ounterbalanee gravity forces which could be as much as 4000 lbs. at the point of the con~yor head against the runner, 80 that the runner 94 i~ only gently pushed along the ground. ~uch hydraulic force can be applied to relieve sny amount of the gravity pr~sure but, preferably, allows a minimal amount of gravity to keep the head against the ground ~urface.
~ 3 ~
As an alternative to scraper 90, a break-away scraper arrangement as shown in FIGS. 7 and 8 can be employed. Such a scraper i8 attached to the ~onveyor 26 by braeket 108 which is attached along on~ edge to the ~onveyor and aeparts downwardly away from the underside o~ the conveyor. A scraper bracket 110 (also 6hown ~n FIGS. 9 and 10) i6 pivotslly atta~hed to bracket 108 at bolt 112 such that it can pivot up and ~own as will be describe~ below. A brea~-away ~raper plata 114 i~ in-turn pivotally attached to ~craper bracket 110 at bolt 116 and also at break-away point 118. Break-away ~late 114 ha~ curYed ~ur~ace 120 which will ~upport a curv~d plate on two cross ~upports 122 and 124 (as shown in FIGS. 11 and 12).
In the svent that the ~craper ~hown in FIGS. 7-12 collides with a hidden object in the windrow, the break-away seraper plat~ 114 will be forced rearwar~ly, ehearing the ~mall diametar shearing bolt at 118l ~nd frsely pivoting about the bolt at 116. Accordingly, a colli~ion of the scraper with such a hidden, im~ovabl~ object will not: cause damage to the conveyor, or possibly, injury to the operator, but will only causs the ~hearin~ o~ the bolt at 118.
The ~econd 6trategy contempl~ted by the present inve~tion for avoiding.paving material passing by the conveyor head as airected to maintal~ing a ~et di~tance ~possibly zero) between the runner 94 and the scraper face 120. This is accompli~he~ by a linkage p~ate 126 (FIG. 7) which connects ~ate plate 96 ~ith ~craper bracket 110 at slidable connection 128. ~he linkage plate 126 is pivotally atta~hed to the conveyor at pivot hinge 130. Accordingly, mo~ement of the runner upwards or downwards (shown at phantom lines 132 in FIG. 7) will cau~e an appropriate movem~nt Df scraper plate ~ 3 ~
120. Accordingly, a predetermined di~tance between $he bottom of plate 120 and the runner 94 (Bet by a~justment of linkage 126 at sli~able co~nection 128) will be maintained while runner 94 movss up and ~own as it ride~ over the ground.
Nhen operating the adjustable gate as ~hown in FIG. 7, the break-away plate 120 can be set to ride eve~ with the bottom of the runner 94, as ~hown in FIG. 7, or raisea relative to the runner to allow a uniform mat o~ a pre~et~r~ined thicknes~ to be formed by the w raper 120 pas~i~g over ~he windrow.
In th;~ arrangeme~t, cyli~er 100A (Figure 7) replaces adjustable link 100 (o Figurs 5). 3y maintaining a pre-~elected hydraulic pressure to e~t~a cylin~er ~OOA, the downward forc~ of 6ide gate 96 ~nd runner 94 again~t the groun~
can be controlle~ to any desired value. In operation, the pre~sure is adjusted so that the downward ~orce iæ just ~ufficient to hold runner 94 against thç ground, thereby holding ~craper 1~0 in a ~i~ed relation to the ground through linkage 126.
The third 6trategy for avoiding paving material passing by the con~eyor head i~ to control the di~tance between a ~cra~er f~c~ 120 ~n~ th~ grouna ~y m~an~ o a qr~de ssnsor 82A tFigures ?3 and 14~ with 1at bottom portion 84~ that rides along the rond sur~ace~ ~eferring to Figure 13, scraper bracket llOA is connected to the conveyor 26 through pivot 112. ~cr~per ~ace 120 i~ connected to llOA in ~ br~ak-aw~y fashion ~s previou~ly de~cribed. The height of scr3per face 120 from the grouDd is controlled by cylinder 100~ which can raise or lower bracket llOA and scraper ace 120 about pivot 112.
13 1~ ie3 There $~ a brack0t llOA with scrap~r face 120 pivotally moun~a on each side of the co~veyor~ generally behind the ~crew ~ec~.io~ 74 and arrangea to clear a path ~or the wh~elæ 34 on e~ch side of th~ paver.
¢r~e s~nsor ~2A, wor~ing through arm 86~ operates a grade control devi~e 133, ~uch as ~ rotary hy~rnulic proportio~al valve, mounte~ to piqotlng brack~ llOA.
Proportio~al valve 133 controls hy~raul~c cylin~er lOOB to ~aintain the bott~m of s~raper ace 120 at any ~sirad ~istance above the bottom ~urfac8 84A of sensor 82A, ~hich is riaing on the road surace. The depth of material 10wi~g under scraper face 120, ~nd in the wh~el path of ths paver, i~ therzby co~trollea to a fi~ed hei~ht ~bova the road ~urface compensating for any irregularities in the fiurface.
~ n this ~rr~ngement the in:let ena o~ conve~or 126 is positioned at a ~onvenient distance above the ground ~urface by mean~ of cyl~nders 66. It i8 not nec~s~asy to also ~ivot the head about pivot 46 and cylinders ~0 can be used tc lock the head in ~ l~v~l po8~tio~. A~tern~tely, pi~ot 46 and cylinders 70 can be removed.
\
Hydr~ull~ cylinder lOOB i~ ~ontrolled by proportioning valve 133 a8 ~hown ~chematically in Figur~ 15. Proportioning valve 133 i~ ~uppl~ed with hydraulic oil at a ~on~tant, but adjustable pres~ure by hydraulic pump 134. Proportioning valve 133 respon~s to ~ovement of yround sensor 82~ through arm B5A, pas~ing hydraulic oll to hydraulic cylinder lOOB in proportion to the movement of arm ~6A in order to maintain a pre-selected vertical distance between the bottom of sensor 82A (shown by surface 84A~ and valve 133. Since ~alve 133 i8 mounted on lS
~ 3 ~
bracket 10aA with ~cr~per fsc~ 120, the vertical ~i~tan~e between the ~t'com o ~cr~per ~ace 120 an~ the ~roun~ i8 maintained at a pre-~el~cted di~tance. By adju~ting the rotational mounting of ~rm 86A at it~ attachment to valve 133, the h~ight o~ ~ralv~ 133 an~ ~craper aca 12~ f rom the ground can be adjuste~l to any ~e~i re~ ~istance.
One complete set compri~ed of a ~erl~or 82A, a br~cket 110A, a scraper face 120 an~ cyl~nder 100A carl be n~ourlted on sach 8iae of the ~a~chine to cle~r a p3th ~or both ~cha right and left ~ide wheels Or the paver. Thus, S~ae right ~nd lst sides are independ~ntly controlled by ~ensor~ on each ~l~e an~ grade adjustments between the right and left sides of the groun~ ara automatically made.
As described previously with respect to Fig. 1, it i~
also possible to maintain the height o~ the bottom of the cornplete conveyor 48 from the groundl by the use o grade sensors 82, on~ on each ~ide of the machine. In this arrangement one ~ensor 82 on one si~la of the m~chine con~rols cylinder 68 and on~ senQor 82 oll the other side of the machine ~ontrol~ cylinders 70, Figure 4. Sen~ors 82 control their r2spective ~ylinaer~ through proportional hy~aulic val~es ~imilar to the ~rrangement shown in Fiqure 15, with cylinder 68 ~or cyli~ders 70) 6ubstituted or cylinder 100B, and grade control 84 in Fig. 1 sub~titut2d ~or ~ensor B2 on one ~ide of the conveyor ~and the ~snsor 82 on the otber si~e controlling cylind~rs 70~.
From the above description i~ will be apparent that there is provided an improved paver with the desirable advantages described above, but which obviously is susceptible to modification in its form, method, operation, detailed ~ .
conxtruction an~ arrangement ~thout ~3epart~ q from the prin~iples inYolve~. It is to be understood that the invention i~ not limit~d to t~ 8peciiEit~ eature ~hown, but that the means, methoa ana construction herein disclo~ed comprise the preferred form of ~ eral modes o putt;ng tha in~ention into effect. The lnvention i~, th~r~fore, claimed im any o~ it~
forms or modificat~ons within th~ legitimats an~ ~alid ~;eope of th~s appenda~ claims.
Claims (47)
1. A paver capable of picking-up a windrow of paving material from the ground, the paver comprising:
a self-propelled chassis having a forward end and a rear end;
a pick-up means pivotally supported on the forward end of the chassis capable of conveying paving material from outside the chassis and depositing it in the chassis; and means for carrying the paving material deposited in the chassis to the ground near the rear end of the chassis means supported on the rear end of the chassis for producing a road surface from paving material deposited on the ground;
wherein the pick-up means is pivotally supported to pivot in two dimensions relative to the chassis.
a self-propelled chassis having a forward end and a rear end;
a pick-up means pivotally supported on the forward end of the chassis capable of conveying paving material from outside the chassis and depositing it in the chassis; and means for carrying the paving material deposited in the chassis to the ground near the rear end of the chassis means supported on the rear end of the chassis for producing a road surface from paving material deposited on the ground;
wherein the pick-up means is pivotally supported to pivot in two dimensions relative to the chassis.
2. The paver of claim 1 wherein the pick-up means is pivotally supported on a mounting which is itself pivotally supported on the chassis, the pivotal support on the mounting being perpendicular to the pivotal support on the chassis.
3. The paver of claim 1 wherein a runner means is attached to the pick-up means, the runner means capable of supporting the pick-up means a predetermined distance above the ground.
4. The paver of claim 3 further comprising means attached between the chassis and the pick-up means for applying a counterbalancing force on the pick-up means against the force of gravity.
5. The paver of claim 4 wherein the counterbalancing force is applied by hydraulic pressure.
6. The paver of claim 2 wherein the pick-up means comprises a lifting conveyor having input and discharge ends and means to transport paving material between the two ends, the lifting conveyor having means at its input end to feed loose paving material on the ground into the conveyor, the feed means comprising at least one grade control supported on the conveyor.
7. The paver of claim 6 wherein the feed means further comprises transverse conveyor means to convey paving material from the side of the lifting conveyor toward the means to transport paving material between the two ends.
8. The paver of claim 6 wherein the feed means has two grade controls, one on each side of the input end, and wherein the grade controls at least partially control the pivoting about the mounting.
9. The paver of claim 8 wherein the grade controls at least partially control the pivoting about the support between the mounting and the chassis.
10. The paver of claim 7 wherein the transverse conveyor means comprises a screw conveyor.
11. The paver of claim 1 wherein the pick-up means comprises a pan and drag chain, the drag chain being supported on drive shafts, at least one near each end of the pick-up means, and also being supported on an idler shaft above and forward of the drive shaft near the input end.
12. A paver capable of picking-up a windrow of paving material from the ground, the paver comprising:
a self-propelled chassis having forward and rear ends;
a lifting conveyor pivotally supported on the chassis, the lifting conveyor having an input end and a discharge end, the lifting conveyor comprising a pan and a drag chain, the drag chain supported on one shaft near each end, and an additional shaft above and forward of the shaft near the input end;
means for carrying the paving material from the discharge end of the lifting conveyor to the ground near the rear end of the chassis;
means supported on the rear end of the chassis for producing a road surface from paving material deposited on the ground.
a self-propelled chassis having forward and rear ends;
a lifting conveyor pivotally supported on the chassis, the lifting conveyor having an input end and a discharge end, the lifting conveyor comprising a pan and a drag chain, the drag chain supported on one shaft near each end, and an additional shaft above and forward of the shaft near the input end;
means for carrying the paving material from the discharge end of the lifting conveyor to the ground near the rear end of the chassis;
means supported on the rear end of the chassis for producing a road surface from paving material deposited on the ground.
13. The paver of claim 12 further comprising screw conveyors extending from both sides of the input end of the lifting conveyor, the screw conveyors being driven by rotation of the input end shaft.
14. The paver of claim 12 further comprising scraper means attached to the lifting conveyor in order to prohibit passage of paving material from passing under the lifting conveyor.
15. The paver of claim 14 wherein the scraper means is pivotally attached to the lifting conveyor and secured by a break-away pin;
wherein application of a predetermined force will sever the break-away pin and pivot the scraper means in the direction of the force.
wherein application of a predetermined force will sever the break-away pin and pivot the scraper means in the direction of the force.
16. A paver capable of picking-up a windrow of paving material from the ground, the paver comprising:
a self-propelled chassis having a forward end and a rear end;
conveyor means pivotally supported on the forward end of the chassis capable of conveying paving material from a windrow to the chassis;
means for conveying paving material in the chassis to the ground near the rear end of the chassis;
means supported on the rear end of the chassis for producing a road surface from the paving material deposited on the ground;
runner means attached to the conveyor means capable of being fixed at a predetermined distance below the conveyor;
wherein the runner means prohibits the conveyor from resting on the ground; and at least one scraper means attached to the conveyor means to prohibit paving material from passing beneath the conveyor means.
a self-propelled chassis having a forward end and a rear end;
conveyor means pivotally supported on the forward end of the chassis capable of conveying paving material from a windrow to the chassis;
means for conveying paving material in the chassis to the ground near the rear end of the chassis;
means supported on the rear end of the chassis for producing a road surface from the paving material deposited on the ground;
runner means attached to the conveyor means capable of being fixed at a predetermined distance below the conveyor;
wherein the runner means prohibits the conveyor from resting on the ground; and at least one scraper means attached to the conveyor means to prohibit paving material from passing beneath the conveyor means.
17. The paver of claim 16 further comprising means attached between the chassis and the conveyor means for applying a counterbalancing force on the conveyor means against the force of gravity.
18. The paver of claim 17 wherein the means for applying the counterbalancing force is a hydraulic cylinder.
19. The paver of Claim 16 wherein the scraper means projects below the conveyor means the same distance as the runner means maintains the conveyor means above the ground.
20. The paver of Claim 16 wherein the scraper means projects below the conveyor means a smaller distance than the distance the runner means supports the conveyor means above the ground whereby a mat of paving material is formed by the scraper when the conveying means passes over a windrow.
21. A paver capable of picking-up a windrow of paving material from the ground, the paver comprising:
a self-propelled chassis having a forward end and a rear end;
conveyor means pivotally supported on the forward end of the chassis capable of conveying paving material in a windrow to the chassis;
means for conveying paving material in the chassis to the ground near the rear end of the chassis;
means supported on the rear end of the chassis for producing a road surface from the paving material deposited on the ground;
runner means for riding on the ground, the runner means attached to the conveyor means such that it can float relative to the ground; and, scraper means moveably attached to the conveyor means and communicating with the runner means such that the scraper means floats with the runner means;
whereby the distance between the scraper means and the ground is maintained constant.
a self-propelled chassis having a forward end and a rear end;
conveyor means pivotally supported on the forward end of the chassis capable of conveying paving material in a windrow to the chassis;
means for conveying paving material in the chassis to the ground near the rear end of the chassis;
means supported on the rear end of the chassis for producing a road surface from the paving material deposited on the ground;
runner means for riding on the ground, the runner means attached to the conveyor means such that it can float relative to the ground; and, scraper means moveably attached to the conveyor means and communicating with the runner means such that the scraper means floats with the runner means;
whereby the distance between the scraper means and the ground is maintained constant.
22. The paver of claim 21 wherein the scraper means comprises a bracket attached to the conveyor and a scraper plate attached to the bracket at a pivot point and at a break-away pin;
whereby application of at least a predetermined force will sever the break-away pin and pivot the scraper plate in the direction of said force.
whereby application of at least a predetermined force will sever the break-away pin and pivot the scraper plate in the direction of said force.
23. The paver of claim 21 wherein the runner means communicates with the scraper means such that vertical movement of the runner means causes a corresponding vertical movement of the scraper means.
24 24. The paver of claim 23 wherein a controlled downward force is applied against both the runner means and the scraper means.
25. The paver of claim 24 wherein the controlled downward force is applied by a hydraulic cylinder and wherein the controlled downward force is adjustable.
26. The paver of claim 25 wherein the position of the scraper means relative to the runner means is adjustable such that the height of the scraper means above the ground can be predetermined.
27. A paver capable of picking-up a windrow of paving material from the ground, the paver comprising:
a self-propelled chassis having a forward end and a rear end;
conveyor means pivotally supported on the forward end of the chassis capable of conveying paving material in a windrow to the chassis;
means supported on the rear end of the chassis for producing a road surface from the paving material deposited on the ground;
scraper means moveably attached to the conveyor means to restrict at least a portion of the paving material from passing under the conveyor means;
grade control means capable of riding along the ground, the grade control means communicating with the scraper means and maintaining the scraper means at a predetermined height above the ground.
a self-propelled chassis having a forward end and a rear end;
conveyor means pivotally supported on the forward end of the chassis capable of conveying paving material in a windrow to the chassis;
means supported on the rear end of the chassis for producing a road surface from the paving material deposited on the ground;
scraper means moveably attached to the conveyor means to restrict at least a portion of the paving material from passing under the conveyor means;
grade control means capable of riding along the ground, the grade control means communicating with the scraper means and maintaining the scraper means at a predetermined height above the ground.
28. The paver of claim 27 wherein movement of the scraper means is effected by a hydraulic cylinder attached to the conveyor means and wherein the grade control means communicates with a hydraulic radial proportional valve which in-turn communicates with the hydraulic cylinder.
29. The paver of claim 27 wherein the grade control means comprises a runner means to ride on the ground, the runner means being attached to the scraper means.
30. The paver of claim 27 wherein the scraper means is attached to the conveyor means at a pivot connection and by a break-away pin, and wherein the application of a predetermined amount of force against the scraper means will sever the break-away pin and pivot the scraper means about the pivot connection in the direction of the force.
31. A method of paving a road with paving material in a windrow utilizing a self-propelled chassis having a forward end supporting a conveyor means capable of picking-up paving material from a windrow and depositing it in the chassis, the conveyor means being adjustable to the grade of the ground by conveyor means adjustment means, and the chassis also having a rear end supporting means for producing a road surface from paving material deposited on the ground, the method comprising the steps of:
sensing the grade of the ground relative to the conveyor means;
communicating any divergence between the ground grade and the conveyor means to the conveyor means adjustment means;
actuating the conveyor means adjustment means to minimize the divergence.
sensing the grade of the ground relative to the conveyor means;
communicating any divergence between the ground grade and the conveyor means to the conveyor means adjustment means;
actuating the conveyor means adjustment means to minimize the divergence.
32. A method of paving a road with paving material laid in a windrow utilizing a self-propelled chassis having a forward end supporting a conveyor means capable of picking-up paving material from a windrow and depositing it in the chassis, and the chassis having a rear end supporting means for producing a road surface from paving material deposited on the ground, the method comprising the steps of:
counterbalancing a portion of the downward force of gravity acting on the conveyor means; and supporting the conveyor means off the ground by runner means capable of sliding along the ground.
counterbalancing a portion of the downward force of gravity acting on the conveyor means; and supporting the conveyor means off the ground by runner means capable of sliding along the ground.
33. A method of paving a road with paving material laid in a windrow utilizing a self-propelled chassis having a forward end supporting a conveyor means capable of picking-up paving material from a windrow and depositing it in the chassis, and the chassis having a rear end supporting means for producing a road surface from paving material deposited on the ground, the method comprising the steps of:
supporting the conveyor means off the ground by runner means capable of sliding along the ground and also capable of vertical movement relative to the conveyor means; and providing scraper means attached to the conveyor means, the scraper means capable of vertical movement relative to the conveyor means, said scraper means movement corresponding to the movement of the runner means.
supporting the conveyor means off the ground by runner means capable of sliding along the ground and also capable of vertical movement relative to the conveyor means; and providing scraper means attached to the conveyor means, the scraper means capable of vertical movement relative to the conveyor means, said scraper means movement corresponding to the movement of the runner means.
34. A pick-up apparatus adapted to transfer at least a portion of a windrow of paving material from the ground to a paver, the pick-up comprising:
a chassis;
a conveyor at least partially supported on the chassis;
scraper means attached to the conveyor to prohibit passage of paving material from under at least a portion of the conveyor, the scraper means capable of rearward movement relative to the conveyor upon application of at least a predetermined force.
a chassis;
a conveyor at least partially supported on the chassis;
scraper means attached to the conveyor to prohibit passage of paving material from under at least a portion of the conveyor, the scraper means capable of rearward movement relative to the conveyor upon application of at least a predetermined force.
35. The pick-up apparatus of claim 34 further comprising ground-engaging means communicating with the conveyor, the ground-engaging means at least partially supporting the conveyor.
36. The pick-up apparatus of claim 35 wherein the ground-engaging means are runners.
37. The pick-up apparatus of claim 34 wherein the scraper means is pivotally attached to the conveyor and secured against the predetermined force by a break-away pin.
38. The pick-up apparatus of claim 34 wherein the scraper means projects downwardly from the conveyor, the distance that it projects being manually adjustable.
39. The pick-up apparatus of claim 35 wherein the ground-engaging means is adjustable to vary the height of the conveyor above the ground.
40. The pick-up apparatus of claim 34 wherein the scraper means is biased downward to engage the ground.
41. A pick-up apparatus adapted to transfer at least a portion of a windrow of paving material from the ground to a paver, the pick-up comprising:
a chassis;
a conveyor at least partially supported on the chassis;
scraper means pivotally attached to the conveyor and projecting downwardly from the conveyor to prohibit passage of paving material from under at least a portion of the conveyor, the scraper means capable of rearward movement relative to the conveyor upon application of at least a predetermined force, the scraper means secured against the force by a break-away pin, the scraper means being biased downward to engage the ground; and ground engaging means communicating with the conveyor and at least partially supporting the conveyor, the ground-engaging means being adjustable to vary the height of the conveyor above the ground.
a chassis;
a conveyor at least partially supported on the chassis;
scraper means pivotally attached to the conveyor and projecting downwardly from the conveyor to prohibit passage of paving material from under at least a portion of the conveyor, the scraper means capable of rearward movement relative to the conveyor upon application of at least a predetermined force, the scraper means secured against the force by a break-away pin, the scraper means being biased downward to engage the ground; and ground engaging means communicating with the conveyor and at least partially supporting the conveyor, the ground-engaging means being adjustable to vary the height of the conveyor above the ground.
42. A pick-up apparatus adapted to transfer at least a portion of a windrow of paving material from the ground to a paver, the pick-up comprising:
a chassis;
a conveyor pivotally supported on the chassis;
transverse conveyor means attached to the conveyor to move windrow material from a position transversely outside the conveyor to the conveyor;
scraper means attached to the transverse conveyor to prohibit passage of material from under at least a portion of the transverse conveyor means;
wherein the scraper means is biased downward to engage the ground.
a chassis;
a conveyor pivotally supported on the chassis;
transverse conveyor means attached to the conveyor to move windrow material from a position transversely outside the conveyor to the conveyor;
scraper means attached to the transverse conveyor to prohibit passage of material from under at least a portion of the transverse conveyor means;
wherein the scraper means is biased downward to engage the ground.
43. The pick-up apparatus of claim 42 wherein the transverse conveyor means is a screw conveyor.
44. The pick-up apparatus of claim 42 wherein the scraper means will move rearwardly relative to the conveyor upon application of at least a predetermined force.
45. The pick-up apparatus of claim 44 wherein the scraper means is pivotally connected to the conveyor and secured against rearward movement by a break-away pin.
46. The pick-up apparatus of claim 44 further comprising ground-engaging means at least partially supporting the conveyor, the ground-engaging means being adjustable to vary the height of the conveyor.
47. A pick-up apparatus adapted to transfer at least a portion of a windrow of paving material from the ground to a paver, the pick-up comprising:
a chassis;
a conveyor pivotally supported on the chassis;
a screw conveyor attached to the conveyor to move windrow material from a position transverse the conveyor to the conveyor;
scraper means pivotally connected to the screw conveyor to prohibit passage of material from under at least a portion of the screw conveyor, the scraper means being biased downward to engage the ground, the scraper means being secured against rearward movement by a break-away pin that will release upon application of at least a predetermined force; and ground engaging means at least partially supporting the conveyor, the ground engaging means being adjustable to vary the height of the conveyor.
a chassis;
a conveyor pivotally supported on the chassis;
a screw conveyor attached to the conveyor to move windrow material from a position transverse the conveyor to the conveyor;
scraper means pivotally connected to the screw conveyor to prohibit passage of material from under at least a portion of the screw conveyor, the scraper means being biased downward to engage the ground, the scraper means being secured against rearward movement by a break-away pin that will release upon application of at least a predetermined force; and ground engaging means at least partially supporting the conveyor, the ground engaging means being adjustable to vary the height of the conveyor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US30908089A | 1989-02-10 | 1989-02-10 | |
| US309,080 | 1989-02-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1319040C true CA1319040C (en) | 1993-06-15 |
Family
ID=23196600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000596992A Expired - Fee Related CA1319040C (en) | 1989-02-10 | 1989-04-18 | Integrated paver with windrow pick-up capability |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0385017A1 (en) |
| JP (1) | JPH02221502A (en) |
| CA (1) | CA1319040C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AUPM922894A0 (en) | 1994-11-04 | 1994-11-24 | Strathayr Pty. Limited | Methods of and apparatus for laying turf |
| US6135671A (en) * | 1998-02-27 | 2000-10-24 | Niigata Engineering Co., Ltd. | Paving materials loading apparatus and paving machine |
| CN106702833B (en) * | 2017-02-27 | 2019-05-28 | 中铁磁浮科技（成都）有限公司 | One kind is vibrated and integer construction equipment and construction technology for the straight shop fixtures seat of subway |
| CN111041957B (en) * | 2019-12-11 | 2022-08-19 | 秦刚 | Road surface crack patching device is used in traffic engineering construction |
| CN113152222B (en) * | 2021-04-13 | 2022-11-29 | 徐州工业职业技术学院 | Ironing plate suitable for small paver |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2064807A (en) * | 1932-08-20 | 1936-12-22 | Barber Greene Co | Road building machine |
| DE849827C (en) * | 1950-03-09 | 1952-09-18 | Heseper Torfwerk Ges Mit Besch | Device for collecting laid peat sod |
| US3693512A (en) * | 1971-01-21 | 1972-09-26 | Barber Greene Co | Apparatus for handling particulate material |
| DE2845680A1 (en) * | 1978-10-20 | 1980-04-30 | Doppstadt Werner | Stripped road asphalt sweeper - has adjustable frame linked to stripper, with collector, remover and conveyor mechanisms |
| US4200408A (en) * | 1978-11-13 | 1980-04-29 | Babler Bros., Inc. | Windrow pickup attachment for asphalt pavement laying apparatus |
| JPS6030805B2 (en) * | 1981-11-27 | 1985-07-18 | 日本鋪道株式会社 | Subgrade soil stabilization treatment equipment |
| JPS5996321A (en) * | 1982-11-25 | 1984-06-02 | Mitsubishi Heavy Ind Ltd | Foundation construction machine |
| EP0244708A3 (en) * | 1986-04-28 | 1988-07-27 | Josef Schroll | Snow-clearing apparatus |
-
1989
- 1989-04-04 EP EP89303335A patent/EP0385017A1/en not_active Withdrawn
- 1989-04-18 CA CA000596992A patent/CA1319040C/en not_active Expired - Fee Related
- 1989-05-19 JP JP12653789A patent/JPH02221502A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0385017A1 (en) | 1990-09-05 |
| JPH02221502A (en) | 1990-09-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |