EP1031660A1 - Screed - Google Patents

Abstract

The batten consists of an external base batten (G) having side plate (4) and two extendable side battens (A) each being half the width of the base batten and being displaceable in an outward direction. In the fully extended position of the side battens, the guides (S) are located on either side of the longitudinal center of the base batten in the opposite side batten.

Description

The invention relates to a screed according to the preamble of claim 1.

With a screed according to EP-A-493 889 (Fig. 1 and 2) is used as one of the guide devices the extending screed is the base section of a telescopic tube arrangement which is fixed to the base board used, the extendable end section on the outer cheek the screed is attached. Second from the first across to the direction of extension spaced guide device is used on the support structure for the extending screed Attached guide bar, which is attached to an outer screed cheek Torque support engages. The torque arm takes on torsional moments the screed around the first guide on the base portion of the first Guide device is in the outer base screed and in a near the Longitudinal center of the basic screed integrated inner basic screed cheek attached. To the inside Supporting the extending screed, the sliding guide engages around the base section, such that they are between the insides of the two basic screed cheeks can move. The sliding guide is connected to the support structure of the extending screed and even protrudes over the end facing the center of the base pile. The screed is driven by a hydraulic cylinder on the inner screed beam is supported and attacks the outer extending screed cheek. by virtue of the wall thicknesses of the basic screed cheeks, the distance from the central screed longitudinal center positioned inner base screed and the thickness of the sliding guide the available extension stroke is shorter than half the screed length. As a transport width prescribed by the authorities when the extending screeds are retracted The usable extension stroke cannot be exceeded the screed's transport width does not quite double due to the extending screeds.

With one from the company brochure "the right screed for every task", the Fa. Joseph Vögele AG, D-6846 Mannheim, DE, registration number 2400/10 / 2.97, p. 12 and 13, known screed serves as a guide device for the extending screed a telescopic tube arrangement fastened in the base screed, the free, extendable end coupled to the outer cheek of a support structure of the extending screed is. A second guide device is provided by a on the back of the support structure arranged guide bar and one on the outer base screed attached torque arm acting on the guide bar. On the inside is the supporting structure of the screed supported with a sliding guide, which as further guide device uses the base section of the telescopic tube arrangement and can be moved back and forth between the basic screed cheeks. Because the usable The travel stroke is shorter than half the base screed or transport width Do not completely double the basic width when extending screeds.

Increasingly, planks are required by the user, which make it possible to to actually double the basic or transport width as far as possible. At a Screed according to DE-A-198 27 902 is the sliding guide on an additional one Sliding guide and adjustable with this 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 enables double the basic or working width of the basic screed and the required transport width adjust.

Because the working width of the screed smoothing plate, that of the movable Support structure is attached, a maximum of half the working width of the smoothing plate Base screed could be, with the large extension stroke of such screeds no overlap in the exit direction that is important for the surface quality of the road surface between the smoothing plates. To solve this problem it is known the smoothing plate of the extending screed with protrusions protruding over the end face to be provided, which produce the overlap in the extended position. These protrusions are so that the planks can still be retracted far enough offset to each other on the smoothing plates of the two screeds in the working direction, so that they are in the fully retracted position of the screeds in the manner of a toothing mesh.

Further prior art is contained in GB 2 024 900 A and EP 0 686 729 A.

The invention has for its object to a screed of the type mentioned create that allows the basic or other in a structurally simple manner Double the transport width of the basic screed as far as possible with the extending screeds or even exceed. It is also important in this regard, the proven stable inside The screed is supported as in the screed concepts mentioned at the beginning with a limited extension stroke.

The object is achieved with the features of claim 1.

With the artifice, the sliding guide of the support structure of the extending screed when retracted Extending screed across the longitudinal center of the base screed into the opposite The usable extension stroke can be clearly shifted by shifting the base plank half extend. Despite the large, possible extension stroke, the supporting structure remains and thus the extending screed inside the base screed in a proven manner stably supported. Because the sliding guide is far enough when extending the screed If it remains behind the extending screed, the extending screed can be extended further the sliding guide into one through the inside of the outer base beam defined end position. Then the basic width is doubled or have the screeds extended even further.

According to claim 2, the guide devices and the sliding guides are offset, so that the two sliding guides can pass each other.

According to claim 3, the guide device for the sliding guide extends to into the opposite base screed half, so that the sliding guide over the entire travel stroke remains properly supported.

According to claim 4 are two proven guide devices for the screed provided, the effective lengths of which are matched to the increased extension stroke.

In the embodiment of claim 5, the base section of the telescopic tube arrangement serves which forms a guide device for the screed, at the same time also as a guide device for the sliding guide, which therefore does not have its own guide device needed. However, the two telescopic tube arrangements are transverse offset from each other to the pull-out direction to the sliding guides during adjustment to pass each other in the fully retracted position.

Alternatively, according to claim 6, in addition to that designed as a telescopic tube arrangement Guide device for the entire extending screed for the sliding guide a guide rod fixed in the base screed, preferably between its cheeks or a guide tube is provided. The telescopic tube arrangement leads and mainly supports the screed over its outer cheek. The guide rod guides and supports the screed over the sliding guide. Because these two Guide devices are spaced, so are also tilting or twisting moments the extending screed.

In the embodiment according to claim 7 is in addition to the two guide devices the extending screed a third guide device in the form of Torque support engaging guide bar provided.

According to claim 8 is the supporting device for the sliding guide Part of the inner screed cheek over the longitudinal center of the screed relocated to the opposite half of the screed, so that the guide device supports the sliding guide over the entire travel stroke.

It is expedient according to claim 9 on this to the other half of the base screed relocated part of the inner basic screed beam a receptacle for driving the Extending screed arranged. The drive can be a hydraulic cylinder with a long stroke be, or a pneumatic cylinder, a rack and pinion drive or the like.

According to claim 10, the guide devices for the sliding guide in the vertical direction offset to each other, so with both screeds in approximately the same support conditions available.

According to claim 11, the distance between the guide rod and the torque arm larger than the distance between the guide rod and the telescopic tube arrangement, torque of the screed with the largest possible lever arm to be able to record.

Alternatively, the drive is integrated in one of the guide devices, to save space and possibly reduce the number of components.

According to claim 13, the support structures of the extending screeds have open ends Entry recesses for the other sliding guide.

According to claim 14 is a continuously movable additional screed on each screed removably attached. Working widths can be achieved with the additional extending screeds set that much more than twice the basic or transport width the base screed. In the event that there are no such large working widths the additional screeds can be easily removed. This concept has independent inventive meaning and is not in the concept of one Screed bound, with the extendable screeds almost twice the basic width can be adjusted.

According to claim 15, each additional screed has its own sliding drive on, which expediently to the drive source or control of the screed, or the paver is connectable.

According to claim 16, the additional screed has its own height adjustment, to adapt to the respective setting of the basic screed or extending 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 In principle, the extending screed can be prefabricated if necessary used to attach the additional screed.

Fig. 1

einen schematischen Horizontalschnitt einer Bohle, wobei in der linken Hälfte der Fig. die Ausziehbohle voll ausgefahren, in der rechten Hälfte der Fig. hingegen voll eingefahren ist,

Fig. 2

eine Seitenansicht in Blickrichtung II in Fig. 1, wobei die eigentlichen Bohlenkörper der Grundbohle und der Ausziehbohlen weggelassen sind,

Fig. 3A + B

Detailansichten, ähnlich Fig. 1, der linken Grundbohlenhälfte mit der Tragstruktur der linken Ausziehbohle, in einem Horizontalschnitt und einer Ansicht in der Schnittebene III-III in Fig. 3A,

Fig. 4A + B

einen Horizontalschnitt und eine Ansicht in der Ebene IV-IV in Fig. 4A der rechten Grundbohlenhälfte mit daran angeordneter Tragstruktur einer voll eingezogenen Ausziehbohle, und gestrichelt eine an der Tragstruktur der Ausziehbohle abnehmbar angeordnete Zusatzausziehbohle, und

Fig. 5

eine Schemaansicht einer weiteren Ausführungsform, in einer Ansichtsrichtung wie in Fig. 2, wobei gestrichelt eine Detailmodifikation angedeutet ist.

Embodiments of the subject matter of the invention are explained with the aid of the drawing. Show it:

Fig. 1

3 shows a schematic horizontal section of a screed, the extending screed being fully extended in the left half of the figure and fully retracted in the right half of the figure,

Fig. 2

2 shows a side view in viewing direction II in FIG. 1, the actual screed bodies of the base screed and the extending screeds being omitted,

3A + B

Detailed views, similar to Fig. 1, the left base screed half with the support structure of the left extending screed, in a horizontal section and a view in the sectional plane III-III in Fig. 3A,

4A + B

a horizontal section and a view in the plane IV-IV in Fig. 4A of the right base screed half with a supporting structure arranged thereon a fully retracted extending screed, and dashed an additional extending screed removably arranged on the supporting structure of the extending screed, and

Fig. 5

2 shows a schematic view of a further embodiment, in a view direction as in FIG. 2, a detail modification being indicated by dashed lines.

A screed B with a variable working width, especially a screed or screed, which can be connected in a conventional manner to a paver (not shown) 1 consists of a base 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 foldable 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. In the exemplary embodiment shown, the screed width b _{A of} the screed is approximately equal to half the screed width b _G / 2.

The base screed G has in each base screed half H _L , H _R an inner base screed cheek 3 and an outer base screed cheek 4, which are in planes parallel to the direction of travel 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. In 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 not provided with a reference symbol in the direction of view of the drawing plane Basic screed half H _R.

On the part 9 and the outer base screed 4 of each base screed half H _L , H _R , a further guide device F _{2 is} attached, namely a guide rod or a guide tube 10, which is responsible for the inner support and guidance of the extending screed A. Furthermore, a third guide device F _{3 is provided} for the extending screed A, which consists of a guide bar 11 attached to the rear of a box-shaped support structure 12 for the extending screed A and a torque support 13 attached to the outer base screed cheek 4 and holding the guide bar 11. The guide rails 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.

On the support structure 12 for each screed A, 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 support 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 to the opposite base screed half. In this position, in which both sliding guides S have moved past one another into the opposite base plank halves, 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.

In the transition area from each inner basic screed cheek 3 to the other Half of the screed part 9 are brackets 17 for one end of a guide rod 10 provided. Furthermore, there is a receptacle 18 for one on each part 9 provided at 19 with the outer cheek 8 of the screed A drive 20. The drives 20 are also offset from one another in the vertical direction and can Hydraulic cylinders, rack and pinion drives, electric drives, pneumatic drives or the like.

Due to the requirement thus created for the displacement of the sliding guides S from their associated basic screed halves into the respective opposite basic screed halves H _L , H _R , 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.

An overlap indicated at X between the smoothing plates 1, 2 can thereby be observed that the smoothing plates 1 of the base screed G each outward project the outer basic screed cheeks 4. It is conceivable to use the extending planks A extend so far that there is no longer any overlap. In the fully retracted Position (Fig. 1, right half) are on the outer base beam cheeks 4 adjacent outer extending screed cheeks 8 within the basic width e.g. is defined by the working width of the smoothing plates 1.

In the view of FIG. 2 of the basic screed half H _{L it} can be seen that the guide device F ₁ , the section 7 of which is fastened to the outer extending screed cheek 8, in the vertical direction approximately in the middle between the two second guide devices F ₂ and the two drives 20 is positioned, and that the distance between the first guide device F ₁ and the second guide device F _{2 is} smaller than the distance between the second guide device F ₂ and the third guide device F ₃ . The two sliding guides S are highlighted by solid lines, which, however, are thinner than the outline of the outer basic screed cheek 4.

2 shows that the outer base screed cheek 4 is above the support structure 12 reaches away and carries the torque arm 13, in which the at the back of the Carrying structure 12 engages guide rail 11 attached. The support structure 12 of the extending screed A has a base plate 21 on the underside, on which adjustable brackets 22 the extending screed body, not shown in Fig. 2 is attached. A yourself downward extending portion 23 of the outer base beam 4 serves for Attach the base screed body, also not shown.

FIGS. 3A, 3B and 4A, 4B once again illustrate in individual representations the structural design of a base screed 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 entry recess 16 highlighted in FIG. 3A for the sliding guide 5 of the other extending screed A is located above the plate 14 of the sliding guide S of the extending screed A of the base plank half H _L , while the corresponding entry recess 16 is only shown in dashed lines in FIG. 4A since it is is located below the tarpaulin 14 of the sliding guide S in the support structure 12.

3B, 4B it can be seen that cutouts 24 in the support structure 12 prevent penetration of the respective receptacle 18 on part 9 of the other half of the base screed. The comparison of FIGS. 3B, 4B also shows how far the guide strips 11 are offset from each other in the vertical direction.

4A, an additional extending screed Z is indicated by dashed lines, which can be removed the support structure 12 of the screed A is attachable. An alternative is an attachment on a widening flange of the extending screed body with support of the additional displacement device possible on the existing screed body. Such Additional extending screed Z, which can be attached to each of the two extending screeds A steplessly extendable and retractable and enables the setting of a working width, which is significantly larger than twice the basic or transport width of the basic screed G. Fastening points 25 are provided in the supporting structure 12 of each extending screed A, those for fixing a flange 26 of the additional extending screed Z by means of not shown Fasteners are used. These components form a detachable connection device V for the additional extending screed Z. This has a housing 27, in on 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 Smoothing plate, not shown, of the additional extending screed Z in adaptation to the settings Adjust the smoothing plates 1, 2 of the extending planks A or the basic plank G. can.

A further embodiment of a screed is indicated schematically in FIG. 5, 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 on the task of the second guide device F ₂ shown in FIG. 1, which can be omitted as a result. As a further guide device, the third guide device F _{3 is provided} at a great distance from the first guide device F ₁ for each screed. So that the sliding guides S of the two extending screeds can move past each other into the opposite main screed half, the first two guide devices F ₁ are offset in the vertical direction from one another in the two main screed halves.

In the event that the third guide devices F _{3 are} not provided, in contrast to the illustration in FIG. 5, 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 .

In the described embodiments, the guide devices and the Drives offset in the vertical direction of the screed. It is conceivable that the management facilities and / or the drives in the horizontal direction or in oblique To offset directions in space to the one available in the screed optimal use of the standing interior. Furthermore, in the previous embodiments the sliding guide S equipped with a guide sleeve 15, the cylindrical Has managerial contact. Instead of such a guide sleeve 15 could other guiding elements can also be used as it is essentially only on it arrives, the support structure 12 of the extending screed in horizontal and / or vertical Support direction, especially if there are two more guidance devices anyway are provided. It would also be possible to have an extension or a sliding pad the plate 14 engage in a U-profile or a clip-like profile a guide rod to allow the outside to reach over at least on two sides. Because a very big one Extend stroke for the sliding guides S is available, stops for Stroke limitation can be provided, if necessary with elastic pads Define the two end positions of each screed gently.

Claims (16)

Screed, in particular built-in or unscrewed screed, for a road paver, consisting of a base screed (G) with two base screed sides (4) and two base screeds (G) guided on the base screed and laterally movable via drives (20), each of which is approximately half the working width (b _G / 2) of the base screed extending screeds (A), with a plurality of screed fixed guide devices (F1, F2, F3) for each screed (A), and with at least one sliding guide (S) connected to the respective screed (A) leading to the The inside support of the extending screed on one of the guide devices can be moved to the inside of the outer basic screed cheek (4), characterized in that in the fully retracted position of the extending screed (A), the sliding guide (S) extends beyond the longitudinal center (m) of the basic screed (G ) engages in the opposite base plank half (H _R , H _L ). Screed according to claim 1, characterized in that the guide screeds (F ₂ , F ₁ ) fixed to the screed for the sliding guides (S) in the two screed halves (H _R , H _L ) and the two sliding guides (S) are offset transversely to the direction of extension, that the two sliding guides can be moved past each other to their fully retracted positions. Screed according to Claim 1, characterized in that the guide device (F ₂ , F ₁ ) fixed to the base screed for the sliding guide (S) extends from the one base screed half (H _R , H _L ) over the longitudinal center (m) of the base screed (G) the opposite half of the base screed extends. Screed according to claim 1, characterized in that a guide device (F ₁ ) for the extending screed (A) is a telescopic tube arrangement (5, 6, 7) which is attached with a base section (5) in the base screed (G) and with a telescopic section (7) is connected to the extending screed (A), and that, as a further guide device (F ₃ ) of the extending screed (A), at least one guide bar (11) of the extending screed (A) parallel to the telescopic tube arrangement and spaced transversely to the extending direction into a basic screed, Torque support (13) preferably provided on the outer base screed cheek (4) engages. Screed according to claim 4, characterized in that the base section (5) of each telescopic tube arrangement simultaneously forms the guide device (F ₁ ) for the extending screed (A) and for its sliding guide (S), and that the telescopic tube arrangement (5, 6, 7) in one of the base screed halves (H _R ) is offset transversely to the direction of extension relative to the telescopic tube arrangement in the other base screed half (H _L ). Screed according to claim 1, characterized in that a guide device (F ₁ ) for the extending screed (A) is a telescopic tube arrangement (5, 6, 7) which is attached with a base section (5) in the base screed (G) and with a telescopic section (7) is connected to the extending screed (A) and that a guide rod (10), preferably a guide tube, fixed in the base screed (G) serves as the guide device (F ₂ ) for the sliding guide (S). Screed according to claim 6, characterized in that as a further guide device (F ₃ ) of the extending screed (A) a guide bar (11) of the extending screed (A) parallel to the guide rod (10) and spaced transversely to the extending direction into a base screed-fixed, preferably on the provided outer torque screed (4), torque support (13) engages. Screed according to claim 1, characterized in that the two base plank halves (H _R , H _L ) each have inner and outer cheeks (3, 4) and are adjustably connected to one another, and that a guide device (F ₂ ) for the sliding guide (S ) supporting part (9) of the inner base screed cheek (3) is shifted over the longitudinal center (m) of the base screed (G) into the opposite base screed half. Screed according to claim 8, characterized in that on the part (9) of each inner base screed cheek (3) a receptacle (18) for the drive (20), preferably a hydraulic cylinder, which is provided on this screed half extending screed (A), and that the two parts (9) are offset from one another transversely to the direction of extraction. Screed according to claim 2, characterized in that the guide devices (F ₁ , F ₂ ) for the sliding guides (S) are offset from one another in the vertical direction. Screed according to claim 6, characterized in that the distance between the guide rod (10) and the telescopic tube arrangement (5, 6, 7) seen transversely to the pull-out direction is smaller than the distance between the torque arm (13) and the guide rod (10). Screed according to claim 1, characterized in that the drive (20) is integrated in one of the guide devices (F ₁ , F ₂ ), preferably in the telescopic tube arrangement (5, 6, 7). Screed according to claim 1, characterized in that the sliding guides (S) are connected to a box-shaped support structure (12), on the underside of which a screed body of the extending screed (A) can be attached, and that the support structure (12) is in its center towards the base screed (m ) pointing end region has an open entry recess (16) on the front side for the respective other sliding guide (3). Screed, in particular according to one of the preceding claims, characterized in that an infinitely variable additional screed (Z) is removably attached to each screed (A) or its supporting structure (12) by means of a releasable connecting device (V). Screed according to claim 14, characterized in that the additional extending screed (Z) contains a hydraulic, motorized or electromotive displacement drive (28). Screed according to claim 14, characterized in that the additional extending screed (Z) is flanged to the supporting structure (16) of the extending screed (A) by means of at least one flange (26) and has an integrated height adjustment (T).

Images