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 invention relates to a screed according to the preamble of claim 1.
• the base section of a telescopic tube arrangement is used as one of the guide devices of the extension board.
• a second guide device spaced apart from the first transverse to the pull-out direction is a guide bar fastened to the support structure for the pull-out screed, which engages in a torque support fastened to the outer base screed cheek.
• the torque arm absorbs torsional moments of the extending screed around the first guide device.
• the base section of the first guide device is fastened in the outer base screed cheek and in an inner base screed cheek integrated near the longitudinal center of the base screed.
• the sliding guide engages around the base section such that it can move between the inside of the two base screed cheeks.
• the sliding guide is connected to the support structure of the extending screed and even protrudes beyond the end face facing the center screed longitudinal center.
• the drive of the extending screed is a hydraulic cylinder, which is supported on the inner basic screed cheek and engages on the outer extending screed cheek.
• the available extension stroke is shorter than half the basic screed length. Since the transport width prescribed by the authorities must not be exceeded when the extending screeds are retracted, the usable extension stroke means that the screed's transport width cannot be completely doubled.
• a screed known from the company brochure "the right screed for every task", from Joseph Vögele AG, D-6846 Mannheim, DE, registration number 2400/10 / 2.97, pages 12 and 13, serves as a guiding device for the screed a telescopic tube arrangement fastened in the basic screed, the free, extendable end of which is coupled to the outer cheek of a supporting structure of the extending screed is.
• a second guide device is formed by a guide bar arranged on the rear side of the support structure and a torque arm attached to the outer base screed and acting on the guide bar.
• the support structure of the extending screed is supported with a sliding guide, which uses the base section of the telescopic tube arrangement as a further guide device and can be moved back and forth between the base screed cheeks. Since the usable travel stroke is shorter than half the basic screed or transport width, the basic width cannot be completely doubled when the extending screeds are extended.
• the sliding guide can be adjusted on an additional sliding guide and with it through the outer basic screed cheek.
• Screeds are also known in which either the basic screed or the extending screed has an additional telescopic section, which makes it possible to set the double basic or working width of the basic screed and the required transport width.
• the working width of the screed's smoothing plate which is attached to the movable support structure, can be a maximum of half the working width of the screed's smoothing plate, there would be no overlap in the extension direction between the smoothing plates, which is important for the surface quality of the road surface, given the large extension stroke of such screeds.
• these projections on the smoothing plates of both extending screeds are offset from one another in the working direction, so that they engage in the manner of a toothing in the fully retracted position of the extending screeds.
• the invention has for its object to provide a screed of the type mentioned, which allows in a different and structurally simple way to largely double or even exceed the basic or transport width of the basic screed with the extending screeds. In this regard, it is also important to maintain the proven stable inner support of the extending screed as with the screed concepts mentioned at the beginning with a limited extension stroke.
• the usable extension stroke can be significantly extended with the trick of moving the sliding guide of the supporting structure of the extending screed over the longitudinal center of the basic screed into the opposite half of the basic screed when the extending screed is retracted.
• the support structure and thus the extending screed remains stably supported on the inside within the basic screed. Since the sliding guide remains far enough behind the extending screed when the extending screed is extended, the extending screed can be extended further before the sliding guide reaches an end position defined by the inside of the outer basic screed cheek. Then, however, the basic width is already doubled or the extending screeds are extended even further.
• the guide devices and the sliding guides are offset so that the two sliding guides can pass each other.
• the guide device for the sliding guide extends into the opposite base plank half, so that the sliding guide remains properly supported over the entire travel stroke.
• two proven guide devices for the extending screed are provided, the effective lengths of which are matched to the increased extension stroke.
• the base section of the telescopic tube arrangement which forms a guide device for the extending screed, also serves as a guide device for the sliding guide, which therefore does not require its own guide device.
• the two telescopic tube arrangements are offset from one another transversely to the pull-out direction in order to allow the sliding guides to move past one another during the adjustment into the fully retracted position.
• a guide rod or a guide tube is provided in the base screed, preferably between its cheeks.
• the telescopic tube arrangement mainly guides and supports the extending screed over its outer cheek.
• the guide rod guides and supports the extending screed over the sliding guide. Since these two guide devices are spaced apart, tilting or twisting torques of the extending screed are also absorbed.
• a third guide device in the form of the guide bar engaging in the torque arm is provided.
• the part of the inner base screed supporting the guide device for the sliding guide is displaced over the longitudinal center of the base screed into the opposite base screed half, so that the guide device supports the sliding guide over the entire travel stroke.
• a receptacle for driving the extending screed is expediently arranged on this part of the inner basic screed cheek that is displaced into the other half of the basic screed.
• the drive can be a hydraulic cylinder with a long stroke, or a pneumatic cylinder, a rack and pinion drive or the like.
• the guide devices for the sliding guide are offset from each other in the vertical direction, so that there are approximately identical support conditions in both extending screeds.
• the distance between the guide rod and the torque arm is greater than the distance between the guide rod and the telescopic tube arrangement in order to be able to absorb torques of the extending screed with the largest possible lever arm.
• the drive is alternatively integrated in one of the guide devices in order to save space and possibly to reduce the number of components.
• the support structures of the extending screeds have entry recesses open at the end for the respective other sliding guide.
• an infinitely adjustable additional screed is removably attached to each screed.
• working widths can be set that are significantly more than twice the basic or transport width of the basic screed. In the event that such large working widths are not required, the additional screeds can be easily dismantled.
• each additional screed has its own displacement drive, which is expediently connectable to the drive source or control of the screed or the paver.
• the additional screed has its own height adjustment in order to be able to adapt to the respective setting of the base screed or the screed, and the flange can be easily attached to the screed body or attach to the support structure of the extending screed.
• the corresponding attachment points on the extending screed can in principle be prefabricated and are used to attach the additional extending screed if required.
• a screed B with a variable working width in particular a screed or screed which can be connected to a road paver (not shown) in a conventional manner, consists in Fig. 1 of a basic screed G and two extending screeds A.
• the base screed G consists of two base screed halves H L and H R which are connected to one another in the longitudinal center m of the base screed B in a manner not shown in detail and, if necessary, are adjustable or kinkable relative to one another.
• the base screed G could also be in one piece.
• the basic screed G with its smoothing plates 1 indicated by dashed lines, defines a basic screed or transport width b G which, according to official regulations, is, for example, a maximum of approximately 2.55 m.
• Each screed A with its screed plate 2 indicated by dashed lines is approximately half as long as the screed G.
• the screed width b A of the screed is approximately equal to half the screed width b G / 2.
• the basic screed G has in each basic screed half H L , H R an inner basic screed cheek 3 and an outer basic screed cheek 4, which are in planes parallel to the working direction and are rigidly connected to one another by components that are not highlighted.
• a first guide device F1 for the extending screed A is fixed in the basic screed cheeks 3, 4, in the embodiment shown a telescopic tube arrangement 5, 6, 7 consisting of three sections, the basic section 5 being fastened in the basic screed cheeks 3, 4 while the Let sections 6 and 7 extend and section 7 is connected to an outer extending screed cheek 8.
• a part 9 of the inner basic screed cheek 3 of each basic screed half H L , H R is shifted with respect to the associated basic screed cheek 3 over the longitudinal center m of the basic screed G into the opposite basic screed half, ie extends beyond the longitudinal center m.
• Fig. 1 only the part 9 belonging to the inner screed cheek 3 of the screed half H L is provided with a reference number.
• the two parts 9 of the base screed halves H L , H R are namely offset from one another in the vertical direction here, that is to say the part 9 provided with the reference symbol in FIG. 1 lies behind the corresponding part of the other and has no reference symbol in the direction of view of the drawing plane Basic screed half H R.
• a further guide device F 2 is fastened, namely a guide rod or a guide tube 10, which is used for the internal support and guidance of the extending screed A is responsible.
• a third guide device F 3 is provided for the screed A, which consists of a guide bar 11 attached to the rear of a box-shaped support structure 12 for the screed A and a torque arm 13 which holds the guide bar 11 and is attached to the outer base screed cheek 4.
• the guide strips 11 on the two support structures 12 are offset from one another in the vertical direction, so that they reach past one another in the fully retracted positions (right half of FIG. 1) of the extending planks. They are long enough to accommodate the increased starting strokes.
• a sliding guide S is attached to the end region facing the longitudinal center m, which consists, for example, of a solid plate 14 and a sliding sleeve 15.
• the sliding sleeve 15 engages around the guide rod 10 and is guided and supported thereon.
• the sliding guides S of the two support structures 12 are offset from one another in the vertical direction (FIG. 1 looking towards the plane of the drawing), corresponding to the displacement between the second guide devices F 2 .
• Each sliding guide S is attached to the supporting structure 12 in such a way that in the fully retracted position (right half in FIG. 1) it is displaced over the longitudinal center m of the base screed G into the opposite base screed half.
• the sliding sleeves 15 can come to a stop on the parts 9. Adjacent to each sliding guide S, an entry recess 16 is provided in the supporting structure 12, into which the sliding guide S of the other supporting structure can enter.
• each inner basic screed cheek 3 In the transition area from each inner basic screed cheek 3 to the part 9 displaced into the other basic screed half, holders 17 are provided for one end of a guide rod 10. Furthermore, a receptacle 18 for a drive 20 connected to the outer cheek 8 of the extending screed A is provided on each part 9.
• the drives 20 are also offset from one another in the vertical direction and can be hydraulic cylinders, rack drives, electric drives, pneumatic drives or the like.
• each sliding guide S can execute an extension stroke which is greater than the distance between the basic screed cheeks 4, 3, 8 and at least as much is as large as or greater than half the base screed width b G / 2 before the sliding guide, for example with the guide sleeve 15, comes to rest on the inside of the outer base screed cheek 4.
• FIG. 2 shows that the outer base screed cheek 4 reaches over the support structure 12 at the top and carries the torque support 13, in which the guide bar 11 attached to the rear of the support structure 12 engages.
• the supporting structure 12 of the extending screed A has a base plate 21 on the underside, to which the extending screed body, not shown in FIG. A yourself downward-extending section 23 of the outer base screed cheek 4 serves to attach the base screed body, also not shown.
• FIGS. 3A, 3B and 4A, 4B once again illustrate in individual representations the structural design of one base plank half H L , H R , which are shown separated from one another in the longitudinal center m. It can be clearly seen that in the fully retracted position of each screed A, the respective sliding guide 14 is clearly beyond the longitudinal center m and is intercepted, for example on part 9.
• the drive-in recess 16 highlighted in FIG. 3A for the sliding guide S of the other screed A is located above the plate 14 of the push guide S of the pull-out screed A of the base plank half H L , while the corresponding drive-in recess 16 is only shown in broken lines in FIG is located below the plate 14 of the sliding guide S in the support structure 12.
• cutouts 24 in the support structure 12 allow the respective receptacle 18 to penetrate on part 9 of the other base screed half. Furthermore, the comparison of FIGS. 3B, 4B shows how far the guide strips 11 are offset from one another in the vertical direction.
• an additional extending screed Z is indicated by dashed lines, which can be removably attached to the supporting structure 12 of the extending screed A.
• a fastening to a widening flange of the extending screed body with support of the additional displacement device on the existing extending screed body is conceivable.
• Such an additional screed Z which can be attached to each of the two screeds A, is steplessly extendable and retractable and enables the setting of a working width that is significantly greater than twice the basic or transport width of the basic screed G.
• Fastening points 25 are provided, which serve to fix a flange 26 of the additional extending screed Z by means of fastening elements, not shown.
• a releasable connecting device V for the additional extending screed Z This has a housing 27 in which its sliding drive 28 is mounted, by means of which a screed body 29 can be extended to the right from the fully retracted position shown. Further the additional extending screed Z has its own height adjustment device T in order to be able to adjust the smoothing plate, not shown, of the additional extending screed Z in adaptation to the settings of the smoothing plates 1, 2 of the extending screeds A or the basic screed G.
• FIG. 5 schematically shows a further embodiment of a screed, in which the support structure 12 for each screed A is slidably guided directly on the guide device F 1 or its base section 5 by means of the sliding guide S.
• the guide device F 1 takes over the task of the second guide device F 2 shown in FIG. 1, which can be omitted as a result.
• the third guide device F 3 is provided at a large distance from the first guide device F 1 for each screed. So that the sliding guides S of the two screeds can move past each other into the opposite base plank half, the two first guide devices F 1 in both base plank halves are offset from one another in the vertical direction.
• the second guide devices F 2 shown in FIG. 1 could be used to guide the sliding guides S, so that the extending screeds or their supporting structures 12 are supported with their tilting or torque on the guide devices F 1 and F 2 .
• the guide devices and the drives are offset from one another in the vertical direction of the screed. It is conceivable to offset the guide devices and / or the drives in the horizontal direction or in oblique directions in space in order to make optimal use of the interior space available in the screed.
• the sliding guide S is equipped with a guide sleeve 15 which has cylindrical guide contact. Instead of such a guide sleeve 15, other guide elements could also be used, since it is essentially only a question of supporting the support structure 12 of the extending screed in the horizontal and / or vertical direction, in particular if two further guide devices anyway are provided.

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• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Road Paving Machines (AREA)
• Iron Core Of Rotating Electric Machines (AREA)
• Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=8069901

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (5)

Family Cites Families (3)

• 1999
  • 1999-02-24 DE DE29903338U patent/DE29903338U1/de not_active Expired - Lifetime
• 2000
  • 2000-02-15 EP EP00103069A patent/EP1031660B1/de not_active Expired - Lifetime
  • 2000-02-15 DE DE50006201T patent/DE50006201D1/de not_active Expired - Lifetime
  • 2000-02-24 JP JP2000047957A patent/JP3370039B2/ja not_active Expired - Lifetime
  • 2000-02-24 CN CNB001026151A patent/CN1198017C/zh not_active Expired - Lifetime

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