DE29903338U1 - Screed - Google Patents

Description

GRÜNECKER, KINKELDEY,

LAW FIRM MAXIMILIANSTRASSE 58 D-80S38 MUNICH GERMANY

Applicant:

JOSEPH VOEGELE AG

NECKARAUER STR. 168-228 68146 MANNHEIM

LAWYERS

MUNICH

OR. HELMUT EICHMANN

GERHARD BARTH

DR. ULRICH BLUMENRÖDER, LLM.

CHRISTA NIKLAS-FALTER

DR. MICHAEL SCHRAMM, DIPL-PHYS.

DR. MAXIMILIAN KINKELDEY, LLM.

OF COUNSEL

PATENT ATTORNEYS

AUGUST GRÜNEECKER
DR. GUNTER BE20LD
DR. WALTER LANGHOFF

DR. WILFRIED STOCKMAIR (-1996)

PATENT ATTORNEYS EUROPEAN PATENT ATTORNEYS

MUNICH

DR. HERMANN KINKELDEY

DR. KLAUS SCHUMANN

PETER H. JAKOB

WOLFHARD MEISTER

HANS HILGERS

DR. HENNING MEYER-PLATH

ANNELIE EHNOLD

THOMAS SCHUSTER

DR. KLARA GOLDBACH

MARTIN AUFENANGER

GOTTFRIED KLITSCH

DR. HEIKE VOGELSANG-WENKE

REINHARD KNAUER

DIETMAR KUHL

DR. FRANZ-JOSEF ZIMMER

BETTINA K. REICHELT

DR. ANTON K. PFAU

DR. UDO WEIGELT

RAINER BERTRAM

JENS KOCH, M.S. (U of PA) M.S. (ENSPM

COLOGNE

DR. MARTIN DROPMANN

YOUR REF.

OUR REF.

G 4069-25/S

DATE

24.02.99

Plank

MAXIMILIANSTRASSE 58 D-80538 MUNICH

TEL 089/21 23 50 FAX (Gr. 3) 089 / 22 02 87, (Gr. 4) 089 / 21 86 92 93 http://www.grunecker.de - e-mail: postmaster@grunecker.de KAISER-WILHELM-RING 13 D-50o72 COLOGNE

TEL 0221/94 97 22 0 FAX (Gr.3) 0221 /94 97 22 2

e-mail: dropmann@grunecker.de

DEUTSCHE BANK MUNICH NO. 17 51734 BLZ 700 700 10 SWIFT: DEUT DE MM

Plank

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

In a screed according to EP-A-493 889 (Fig. 1 and 2), the base section of a telescopic tube arrangement fixed to the base screed is used as one of the guide devices of the extendable screed, the extendable end section of which is attached to the outer cheek of the extendable screed. The second guide device, spaced apart from the first transversely to the extension direction, is a guide bar attached to the support structure for the extendable screed, which engages in a torque support attached to the outer base screed cheek. The torque support absorbs torsional moments of the extendable screed around the first guide device. The base section of the first guide device is attached to the outer base screed cheek and in an inner base screed cheek integrated near the longitudinal center of the base screed. To support the extendable screed on the inside, the sliding guide surrounds the base section in such a way that it can move between the inner sides of the two base screed cheeks. The sliding guide is connected to the supporting structure of the extending screed and even protrudes beyond the front side facing the longitudinal center of the base screed. The drive of the extending screed is a hydraulic cylinder that is supported on the inner base screed cheek and engages the outer extending screed cheek. Due to the wall thicknesses of the base screed cheeks, the inner base screed cheek positioned at a distance from the longitudinal center of the base screed and the thickness of the sliding guide, the available extension stroke is shorter than half the length of the base screed. As an officially prescribed transport width must not be exceeded when the extending screeds are retracted, the transport width of the screed cannot be fully doubled with the usable extension stroke using the extending screeds.

In the case of a screed known from the company brochure "The right screed for every task" by Joseph Vögele AG, D-6846 Mannheim, DE, registration number 2400/10/2.97, p. 12 and 13, a telescopic tube arrangement fastened to the base screed serves as a guide device for the extending screed, the free, extendable end of which is coupled to the outer cheek of a supporting structure of the extending screed.

pelt. A second guide device is formed by a guide bar arranged on the back of the support structure and a torque support attached to the outer base screed cheek. On the inside, the support structure of the extending screed is supported by a sliding guide, which uses the base section of the telescopic tube arrangement as an additional guide device and can be moved back and forth between the base screed cheeks. Since the usable travel stroke is shorter than half the base screed or transport width, the base width cannot be fully doubled when the extending screeds are extended.

Users are increasingly demanding screeds that make it possible to actually double the basic or transport width as far as possible. With a paving screed in accordance with DE-A-198 27 902, the limitation of the extension stroke of the sliding guide is eliminated by the fact that it can travel on an additional sliding guide and with this through the outer basic screed cheek.

Furthermore, screeds are known in which either the base screed or the extending screed has an additional telescopic section that makes it possible to set twice the base or working width of the base screed and the required transport width.

Since the working width of the screed plate of the extending screed, which is attached to the movable support structure, can be a maximum of half the working width of the screed plate of the base screed, with the large extension stroke of such screeds there would be no overlap in the extension direction between the screed plates, which is important for the surface quality of the road surface. To solve this problem, it is known to provide the screed plate of the extending screed with projections that protrude from its front side, which create the overlap in the extended position. To ensure that the extending screeds can still be retracted far enough, these projections on the screed plates of both extending screeds are offset from one another in the working direction, so that they mesh together like a toothing when the extending screeds are fully retracted.

·

The invention is based on the task of creating a screed of the type mentioned at the beginning, which, in a different and structurally simple way, allows the basic or transport width of the basic screed to be doubled or even exceeded with the extending screeds. In this regard, it is also important to retain the proven stable internal support of the extending screed as in the screed concepts mentioned at the beginning with a limited extension stroke.

The stated problem is solved with the features of claim 1.

The trick of moving the sliding guide of the supporting structure of the extending screed over the longitudinal center of the base screed into the opposite half of the base screed when the extending screed is retracted allows the usable extension stroke to be significantly extended. Despite the large possible extension stroke, however, the supporting structure and thus the extending screed remain stably supported on the inside within the base screed in a proven manner. Since the sliding guide remains behind the extending screed when the extending screed is extended, the extending screed can be extended further before the sliding guide reaches its end position defined by the inside of the outer base screed cheek.

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

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

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

In the embodiment of claim 5, the base section of the telescopic tube arrangement, which forms the one guide device for the extending plank, also serves as the guide device for the sliding guide, which therefore does not require an independent guide device. However, the two telescopic tube arrangements are offset from one another transversely to the extension direction in order to allow the sliding guides to move past one another when adjusted to the fully retracted position.

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

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

According to claim 8, the part of the inner base plank cheek supporting the guide device for the sliding guide is displaced over the longitudinal center of the base plank into the opposite half of the base plank so that the guide device supports the sliding guide over the entire travel stroke.

According to claim 9, a mount for driving the extending screed is expediently arranged on this displaced part of the inner base screed cheek. The drive can be a hydraulic cylinder, a pneumatic cylinder, a rack drive or the like.

According to claim 10, the guide devices for the sliding guide are offset from one another in the vertical direction so that both extending planks have approximately the same support conditions.

According to claim 11, the distance between the guide rod and the torque support is greater than the distance between the guide rod and the telescopic tube arrangement in order to be able to absorb torques of the extendable screed with the largest possible lever arm.

According to claim 12, the drive is alternatively integrated into one of the guide devices, in order to save space and, if necessary, to reduce the number of components.

According to claim 13, the supporting structures of the extending planks have open entry recesses on the front side for the other sliding guide.

According to claim 14, a continuously adjustable additional extension screed is attached to each extension screed in a removable manner. The additional extension screeds can be used to set working widths 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 extension screeds can be easily removed. This concept has its own inventive significance and is not tied to the concept of a screed that can be set to almost twice the basic width with the extension screeds.

According to claim 15, each additional extending screed has its own displacement drive, which can be conveniently connected to the drive source or control of the screed or the road paver.

According to claim 16, the additional extending screed has its own height adjustment, in order to adapt to the respective setting of the base screed or the extending screed.

The flange can be easily attached to the screed body or to the supporting structure of the extending screed. The corresponding attachment points on the extending screed can generally be provided and are only used when required to attach the additional extending screed.

Embodiments of the subject matter of the invention are explained using the drawing. They show:

Fig. 1 is a schematic horizontal section of a plank, with the left

half of the figure the extending beam is fully extended, while in the right half of the figure it is fully retracted.

Fig. 2 is a side view in the direction of II in Fig. 1, where the actual

The plank bodies of the base plank and the extending planks are omitted,

Fig. 3A + B Detailed views, similar to Fig. 1, of the left half of the base pile with the supporting structure of the left extending pile, in a horizontal section and a view in the section plane III-III in Fig. 3A,

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

Fig. 5 is a schematic view of a further embodiment, in a viewing direction as in Fig. 2, with a detailed modification indicated by dashed lines.

A screed B in Fig. 1, in particular a paving screed or roughening screed, which can be connected in a conventional manner to a road paver (not shown), consists of a base screed G and two extending screeds A. The base screed G in this embodiment 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 and, if necessary, adjustable relative to one another. The base screed G could also be one-piece. The base screed G defines with its screed plates 1 indicated by dashed lines a base or transport width b _G , which, in accordance with official regulations, is e.g. a maximum of approx. 2.55 m. Each extending screed A with its screed plate 2 indicated by dashed lines is about half as long as the base screed G. In the embodiment shown, the screed plate width b _A of the extending screed is approximately equal to half the base 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 working direction of travel and are rigidly connected to one another by components not highlighted in detail. A first guide device F1 for the extending screed A is fixed in the base screed cheeks 3, 4, in the embodiment shown a telescopic tube arrangement made up of three sections 5, 6, 7, the base section 5 being fastened in the base screed cheeks 3, 4, while sections 6 and 7 can be extended and section 7 is connected to an outer extending screed cheek 8. A part 9 of the inner base screed cheek 3 of each base screed half H _L , H _R is displaced relative to the associated base screed cheek 3 across the longitudinal center m of the base screed G into the opposite base screed half. In Fig. 1, only the part 9 belonging to the inner base pile cheek 3 of the base pile half H _L is highlighted with a reference symbol. The two parts 9 of both base pile halves Hl, Hr are offset from one another in the vertical direction in the embodiment shown, ie the part indicated with the reference symbol 9 in Fig. 1 lies behind the corresponding part of the other base pile half H _R which is not provided with a reference symbol when viewed in the direction of the drawing plane.

A further guide device F ₂ , namely a guide rod or a guide tube 10, is attached to the part 9 and the outer base plank cheek 4 of each base plank half H _L , H _R , which is responsible for the internal support and guidance of the extending plank A. Furthermore, a third guide device F ₃ is provided for the extending plank A, which consists of a guide bar 11 attached to the back of a box-shaped support structure 12 for the extending plank A and a torque support 13 attached to the outer base plank cheek 4. The guide bars 11 on both support structures are offset from one another in the vertical direction so that they reach past one another in the fully retracted position (right half of Fig. 1) of the extending planks.

A sliding guide S is attached to the support structure 12 for each extending screed A at its end pointing towards 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 by it. The sliding guides S of both support structures 12 are offset from one another in the vertical direction (Fig. 1 in the direction of the drawing plane), corresponding to the offset 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 (Fig. 1 right half) it is displaced over the longitudinal center m of the base screed G into the opposite base screed half. In this position, in which both sliding guides S have moved past one another into the opposite base screed halves, the sliding sleeves 15 can come to a stop on the parts 9. Adjacent to each sliding guide S, an entry recess 16 open to the front side is provided in the support structure 12, into which the sliding guide S of the other support structure can enter.

In the transition area from each inner base screed cheek 3 to the part 9 displaced into the other half of the base screed, brackets 17 are provided for one end of a guide rod 10. Furthermore, a holder 18 is provided on each part 9 for a drive 20 connected at 19 to the outer cheek 8 of the extending screed A.

The drives 20 are also offset from one another in the vertical direction and can be hydraulic cylinders, rack and pinion drives, electric drives, pneumatic drives or the like.

Due to the displacement of the sliding guides S into the respective opposite base pile halves H _L , H _{R ,} each sliding guide S can execute an extension stroke which is at least as large as or greater than half the base pile width b _G /2 before the sliding guide, e.g. with the guide sleeve 15, comes to rest on the inside of the inner base pile cheek 4.

An overlap between the screed plates 1, 2, indicated at X, can be maintained by the screed plates 1 of the base screed G projecting outwards over the outer base screed cheeks 4. It is conceivable to extend the extendable screeds A so far that there is no longer any overlap. In the fully retracted position (Fig. 1, right half), the outer extendable screed cheeks 8 resting against the outer base screed cheeks 4 lie within the base width, which is defined, for example, by the working width of the screed plates 1.

In the view of Fig. 2 of the base screed half H _L , it can be seen that the guide device F ₁ , the section 7 of which is attached to the outer extending screed cheek 8, is positioned in the vertical direction approximately in the middle between the two second guide devices F ₂ and the two drives 20, and that the distance between the first guide device Fi 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 are, however, thinner than the outlines of the outer base screed cheek 4.

Fig. 2 shows that the outer base screed cheek 4 extends over the top of the support structure 12 and carries the torque support 13, into which the guide bar 11 engages on the rear of the support structure 12. The support structure 12 of the extending screed A has

has a base plate 21 on the underside, to which the extendable plank body (not shown in Fig. 2) is attached via adjustable brackets 22. A downwardly extending section 23 of the outer base plank cheek 4 serves to attach the base plank body (also not shown).

3A, 3B and 4A, 4B show once again in individual representations the structural design of each base screed half H _L , H _R , which are separated from one another in the longitudinal center m. It can be clearly seen that in the fully retracted position of each extending screed A, the respective sliding guide 14 is located well 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 S 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 screed half H _L , while the corresponding entry recess 16 in Fig. 4A is only shown in dashed lines, since it is located below the plate 14 of the sliding guide S in the supporting structure 12.

In Fig. 3B, 4B it can be seen that cutouts 24 in the support structure 12 allow the penetration of the respective receptacle 18 into part 9 of the other half of the base plank. Furthermore, it can be seen from the comparison of Fig. 3B, 4B how far the guide strips 11 are offset from one another in the vertical direction.

In Fig. 4A, an additional extending screed Z is indicated in dashed lines, which can be attached detachably to the support structure 12 of the extending screed A. Alternatively, fastening to the 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 extending screed Z ₁ , which can be attached to each of the two extending screeds A, can be extended and retracted continuously and enables the setting of a working width that is significantly larger than twice the basic or transport width of the basic screed G. Fastening points 25 are provided in the support structure 12 of each extending screed A, which serve to fix a flange 26 of the additional extending screed Z using fastening elements (not shown). These components form a detachable connection.

device V for the additional extending screed Z. This has a housing 27 in which a displacement drive 28 of the additional extending screed Z is mounted, by means of which a screed body 29 can be extended to the right from the fully retracted position shown. Furthermore, the additional extending screed Z has its own height adjustment device T in order to be able to adjust the screed plate (not shown) of the additional extending screed Z to match the settings of the screed plates 1,2 of the extending screeds A or the base screed G.

Fig. 5 schematically shows a further embodiment of a screed in which the support structure 12 for each extending screed is guided by means of the sliding guide S directly on the guide device F ₁ or its base section 5. The guide device Fi takes over the task of the second guide device F ₂ shown in Fig. 1, which can therefore be omitted. As a further guide device, the third guide device F ₃ is provided for each extending screed at a large distance from the first guide device F _1. So that the sliding guides S of both extending screeds can move past each other into the opposite base screed half, the two first guide devices F ₁ in both base screed halves are offset from each other in the vertical direction.

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 planks or their supporting structures 12 are supported with their tilting or torques on the guide devices F ₁ and F ₂ .

In the described embodiments, the guide devices and the drives are offset from each other 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. Furthermore, in the previous embodiments, the sliding guide S is equipped with a guide sleeve 15 which is cyclically

• ···· at

• m m

•••a a a

Instead of such a guide sleeve 15, other guide elements could also be used, since it is essentially only important to support the supporting structure 12 of the extending plank in the horizontal and/or vertical direction, especially if two further guide devices are provided anyway. It would also be possible for an extension or a sliding cushion of the plate 14 to engage in a U-profile or for a clamp-like profile to overlap a guide rod on the outside at least on two sides. Since a very large extension stroke is available for the sliding guides S, stops could be provided to limit the stroke, if necessary with elastic supports that gently define the two end positions of each extending plank.

Claims (16)

r «tu I VpQ ■ isprüche 1. Screed, in particular a laying or roughening screed, for a road finisher, comprising a base screed (G) having external base screed cheeks (4) and two extending screeds (A) which can be moved laterally on the base screed via drives (20) and each extend approximately over half the working width (b _G /2) of the base screed, with several guide devices (F1, F2, F3) fixed to the base screed for each extending screed (A), and with at least one sliding guide (S) connected to the respective extending screed (A), which can be moved to the inside of the outer base screed cheek (4) on one of the guide devices in order to support the extending screed on the inside, characterized in that in the fully retracted position of the extending screed (A), the sliding guide (S) is arranged beyond the longitudinal center (m) of the base screed (G) in the opposite base screed half (Hr, Hl). 2. Screed according to claim 1, characterized in that the guide devices (F ₂ , F ₁ ) fixed to the base screed for the sliding guides (S) in the two base screed halves (Hr, Hl) and the two sliding guides (S) are offset transversely to the extension direction in such a way that the two sliding guides can be moved past each other to the fully retracted position. 3. 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 one base screed half (Hr, H _l ) over the longitudinal center (m) of the base screed (G) into the opposite base screed half. 4. 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 to a base section (5) in the base screed (G) and is connected to the extending screed (A) by a telescopic section (7), and that as a further guide device (F ₃ ) of the extending screed (A) at least one The guide bar (11) of the extending screed (A), which is spaced transversely to the direction of extension, engages in a torque support (13) fixed to the base screed and preferably provided on the outer base screed cheek (4). 5. 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 base screed half (H _R ) is offset transversely to the extension direction relative to the telescopic tube arrangement in the other base screed half (H _L ). 6. 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 to a base section (5) in the base screed (G) and is connected to the extending screed (A) by a telescopic section (7), 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). 7. 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) which is parallel to the guide rod (10) and spaced therefrom transversely to the extension direction engages in a torque support (13) which is fixed to the base screed and is preferably provided on the outer base screed cheek (4). 8. Screed according to claim 1, characterized in that the two base screed halves (Hr, Hl) each have inner and outer cheeks (3, 4) and are adjustably connected to one another, and that a part (9) of the inner base screed cheek (3) supporting the guide device (F ₂ ) for the sliding guide (S) is displaced beyond the longitudinal center (m) of the base screed (G) into the opposite base screed half. 9. Screed according to claim 8, characterized in that a receptacle (18) for the drive (20), preferably a hydraulic cylinder, of the extending screed (A) arranged on this half of the base screed is provided on the displaced part (9) of the inner base screed cheek (3), and that the two parts (9) are offset from one another transversely to the extension direction. 10. 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. 11. 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 extension direction is smaller than the distance between the torque support (13) and the guide rod (10). 12. 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). 13. Screed according to claim 1, characterized in that the sliding guides (S) are connected to a box-shaped support structure (12) to which a screed body of the extending screed (A) can be attached on the underside, and in that the support structure (12) has, in its end region facing the base screed center (m), an open entry recess (16) on the front side for the other sliding guide (S). 14. Screed, in particular according to one of the preceding claims, characterized in that a continuously movable additional extending screed (Z) is removably attached to each extending screed (A) or its supporting structure (12) by means of a detachable connecting device (V). 15. Screed according to claim 14, characterized in that the additional extending screed (Z) has a hydraulic, motor or electric motor displacement drive
(28) contains. 16. Screed according to claim 14, characterized in that the additional extending screed (Z) is flanged to the support structure (16) of the extending screed (A) by means of at least one flange (26) and has an integrated height adjustment (T).