EP0908562B1 - A finishing machine for laying bituminous aggregates equipped with an improved expandable screed - Google Patents

A finishing machine for laying bituminous aggregates equipped with an improved expandable screed Download PDF

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Publication number
EP0908562B1
EP0908562B1 EP98118776A EP98118776A EP0908562B1 EP 0908562 B1 EP0908562 B1 EP 0908562B1 EP 98118776 A EP98118776 A EP 98118776A EP 98118776 A EP98118776 A EP 98118776A EP 0908562 B1 EP0908562 B1 EP 0908562B1
Authority
EP
European Patent Office
Prior art keywords
expandable
finishing machine
elements
intermediate plate
screed
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 - Lifetime
Application number
EP98118776A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0908562A1 (en
Inventor
Domenico Domenighetti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caterpillar Prodotti Stradali SRL
Original Assignee
Bitelli SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bitelli SpA filed Critical Bitelli SpA
Publication of EP0908562A1 publication Critical patent/EP0908562A1/en
Application granted granted Critical
Publication of EP0908562B1 publication Critical patent/EP0908562B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E01C19/22—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 consolidating or finishing laid-down unset materials
    • E01C19/42—Machines for imparting a smooth finish to freshly-laid paving courses other than by rolling, tamping or vibrating
    • 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
    • E01C2301/14—Extendable screeds
    • E01C2301/16—Laterally slidable screeds

Definitions

  • the most recent embodiments provide a screed composed of four distinct elements, two central elements of which being articulated to each other and having systems for adjusting the inclination of one element relative to the other. On each of these central elements a stem element is mounted which is approximately equal in length to the other elements and is horizontally slidable outwards, moved by hydraulic pistons.
  • the advantage inherent to the two expandable outer elements of the integrated screed is that of being able to vary the laying width at will and without interruption.
  • the expandable side or outer elements may be fixed on the central elements in a variety of ways depending upon the models and the types of finishing machines produced. Generally very precise and rugged cylindrical guides are provided, in order to ensure that sliding takes place respecting the geometric design characteristics of the "screed" element as much as possible.
  • torsional strain which occurs, and can be detected, on the expandable side elements, which allow rapid changing (at the wish of the road constructor and/or of the finishing machine operator) of the laying width of the bituminous aggregate road coating.
  • the expandable side elements with which this modem type of expandable screed is provided must be constructed so as to be as light as possible, though assuming a more or less parallelepiped shape, and therefore, for both these reasons, they are difficult to implement in a sufficiently rigid structure to resist torsional stress.
  • This helical-shaped deformation is shown on the expandable side elements in a most irregular fashion, depending upon the laying width that has been chosen to perform the work. In other words, if the expandable side elements are pushed outwards as far as possible, that is to the end of the stroke, each expandable element is hit completely by the heap of material to be laid on the new roadway and therefore all reaction forces act on the expandable side elements.
  • an expandable side element is subjected to different or differently distributed reaction forces.
  • said expandable side element is considered similar to a parallelepiped with a horizontally and transversally elongated shape, the deformation of most concern is that which tends to cause the two vertical walls lying in the direction of forward travel of the machine during work to rotate relative to each other.
  • An object of the present invention is to allow the angular and vertical positioning of an expandable element to be modified with respect to a corresponding central element to compensate less approximately (than did the invention of the aforementioned Swiss patent) for the elastic deformations caused on the entire screed by the reaction forces that the bituminous aggregate exerts on the active surfaces of the screed during laying.
  • reference F is a road surface finishing machine
  • M is a coating of bituminous aggregate laid on the road.
  • the direction of travel of the finishing machine during the work is indicated by the arrow Y.
  • a right expandable side element of the screed is indicated by 1 and a central right element by 2 while the same elements on the left side are indicated by 1' and 2'.
  • Cylindrical guides 6 and 7, and also a stem 8 of an hydraulic actuator that transversally slides expandable element 1', are mounted in a traditional manner (not shown) on the corresponding central element (2') of the screed.
  • the guides 6 and 7 are mounted integral with the inner surface of an inner plate 9. Mounted on the same surface is an end of the stem 8 of the hydraulic actuator that slides the expandable side element 1' with respect to the fixed central element 2'.
  • the plate 9 is mounted in a pack-like way by means of four through screws schematically shown by 10 and 11 (two of these screws cannot be seen because they are coaxial with the guides 6 and 7) with vertical body 12 of the expandable element 1'.
  • an intermediate plate 13 (provided with large through holes - not visible - to allow screws 10 and 11 to pass through) which is pivoted on body 12 by means of a pivot 14, having a geometric axis of rotation indicated by straight line 14'.
  • the pivot 14 has a horizontal transversal geometric axis (with respect to the entire finishing machine) disposed very near (and parallel) to the horizontal transversal bottom front edge of the expandable element 1'.
  • the plate 13 carries two slide guides 15 (of which one is not visible in Figure 2 because it is hidden by the plate 9).
  • a screw-type or hydraulic adjustment device 16 of a known type engages on one side plate 13 and on the other side a horizontal body 17 of the expandable element 1', allowing angular adjustment of the plate 13 with respect to the element 1', causing rotation around the pivot 14 and then, due to shape and orientation of the geometric axis 14' of the pivot 14, around a horizontal transversal axis very near to the geometric axis that contains the horizontal transversal bottom front edge of the expandable element 1'.
  • Another screw-type or hydraulic adjustment device 18 of a known type engages on one side on the plate 13 and on the other on the plate 9 to cause relative adjustment thereof by sliding one plate with respect to the other in the direction imposed by the guides 15.
  • the four screws 10, 11 etc. can be more or less tightly screwed so as to ensure that the mutual positions which have been fixed acting on the two adjustment devices 16 and 18 remain unchanged, until the changed working conditions induce the operator to change said adjustments.
  • the expandable element 1' acts on the bituminous aggregate mix to be laid by means of the bottom surface of its body 17 and the front surface of the plate 19 integral with the bodies 12 and 17.
  • the object is thus achieved of modifying the angular and vertical positioning of the expandable element 1' with respect to the corresponding central element 2' to compensate, in a less approximate manner than was done with the invention of the aforementioned Swiss patent, for the elastic deformations caused on the entire screed by the reaction forces that the bituminous aggregate exerts on the active surfaces of the screed during laying.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)
  • Road Repair (AREA)
EP98118776A 1997-10-10 1998-10-05 A finishing machine for laying bituminous aggregates equipped with an improved expandable screed Expired - Lifetime EP0908562B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI972297 1997-10-10
IT97MI002297A IT1295307B1 (it) 1997-10-10 1997-10-10 Finitrice per la posa in opera dei conglomerati bituminosi munita di un rasatore estensibile perfezionato

Publications (2)

Publication Number Publication Date
EP0908562A1 EP0908562A1 (en) 1999-04-14
EP0908562B1 true EP0908562B1 (en) 2004-12-08

Family

ID=11378021

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98118776A Expired - Lifetime EP0908562B1 (en) 1997-10-10 1998-10-05 A finishing machine for laying bituminous aggregates equipped with an improved expandable screed

Country Status (5)

Country Link
EP (1) EP0908562B1 (it)
AT (1) ATE284468T1 (it)
DE (1) DE69828016T2 (it)
ES (1) ES2235279T3 (it)
IT (1) IT1295307B1 (it)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6200728B1 (en) 1999-02-20 2001-03-13 Shipley Company, L.L.C. Photoresist compositions comprising blends of photoacid generators
US11105048B2 (en) 2018-10-17 2021-08-31 Caterpillar Paving Products Inc. Screed dual carriage extender tube orientation
US11208769B2 (en) * 2020-03-16 2021-12-28 Caterpillar Paving Products Inc. Screed extension attachment system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH657168A5 (it) 1982-11-16 1986-08-15 Domenico Domenighetti Finitrice di manto stradale con rasatore munito di elementi laterali estensibili che consentono l'allargamento del manto da stendere sul terreno.
GB2250529A (en) * 1990-12-04 1992-06-10 Blaw Knox Const Equipment Screed plate finisher for paving machine
DE29505382U1 (de) * 1995-03-31 1995-07-13 Dynapac Gmbh Einbaubohle für einen Straßendeckenfertiger

Also Published As

Publication number Publication date
EP0908562A1 (en) 1999-04-14
IT1295307B1 (it) 1999-05-04
DE69828016D1 (de) 2005-01-13
ES2235279T3 (es) 2005-07-01
ATE284468T1 (de) 2004-12-15
DE69828016T2 (de) 2005-12-22
ITMI972297A1 (it) 1999-04-10

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