EP1776506B1 - Sandwich scraper strip having a hard metal core - Google Patents

Sandwich scraper strip having a hard metal core Download PDF

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Publication number
EP1776506B1
EP1776506B1 EP05752722A EP05752722A EP1776506B1 EP 1776506 B1 EP1776506 B1 EP 1776506B1 EP 05752722 A EP05752722 A EP 05752722A EP 05752722 A EP05752722 A EP 05752722A EP 1776506 B1 EP1776506 B1 EP 1776506B1
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EP
European Patent Office
Prior art keywords
steel
sandwich
hard metal
scraper bar
metal core
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EP05752722A
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German (de)
French (fr)
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EP1776506A1 (en
Inventor
Roland KÜPER
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Gummi Kueper GmbH and Co KG
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Gummi Kueper GmbH and Co KG
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Priority to PL05752722T priority Critical patent/PL1776506T3/en
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
    • E01H5/00—Removing snow or ice from roads or like surfaces; Grading or roughening snow or ice
    • E01H5/04—Apparatus propelled by animal or engine power; Apparatus propelled by hand with driven dislodging or conveying levelling elements, conveying pneumatically for the dislodged material
    • E01H5/06—Apparatus propelled by animal or engine power; Apparatus propelled by hand with driven dislodging or conveying levelling elements, conveying pneumatically for the dislodged material dislodging essentially by non-driven elements, e.g. scraper blades, snow-plough blades, scoop blades
    • E01H5/061—Apparatus propelled by animal or engine power; Apparatus propelled by hand with driven dislodging or conveying levelling elements, conveying pneumatically for the dislodged material dislodging essentially by non-driven elements, e.g. scraper blades, snow-plough blades, scoop blades by scraper blades

Definitions

  • the present invention relates to a sandwich scraper blade for the plow blade of a snow plow, which is provided above with a steel mounting neck, on which a rubber body is vulcanized with at least one embedded hard material body.
  • a sandwich scraper is out of the DE 34 04 030 C1 known.
  • the hard material bodies of the aforementioned sandwich scraper are rod-shaped or plate-shaped molded bodies, which preferably consist of sintered or cast corundum. Such sandwich scrapers have proven to be excellent.
  • a scraper for the shield of a construction machine or for a snow plow which has a steel scraper, on the underside of a plurality of steel segments are screwed.
  • the steel segments are preferably forged from a tool steel having a higher wear resistance than the steel of the scraper. In the area of the wear surface facing the ground, V-shaped cemented carbide cores are inserted into the steel segments.
  • the present invention seeks to provide a scraper, which is exposed to low wear, has a correspondingly long service life, does not damage the road surface and is also suitable for blackout of the road.
  • the asphalt surface of sandwich scraper bars with hard metal core according to the invention is not appreciably damaged.
  • the hard metal core must be firmly anchored in the steel shell. This can be non-positively - such as by shrinking - and / or cohesively - such as by soldering - done.
  • a further advantage of the use according to the invention of a steel jacket is better heat distribution.
  • the rubbing of the carbide core on the asphalt produces a lot of heat, which is transferred from the steel to the rubber via large surface areas.
  • local overheating of the rubber is avoided, resulting in significantly less wear than when directly embedding hard metal cores in the rubber.
  • Carbides are comparatively expensive materials.
  • the cost of the sandwich scraper can be significantly reduced by using carbide cores made from recycled carbide. This is processed waste material from worn tools of machining.
  • the steel shell or the hard metal core is formed as a rod-shaped or plate-shaped molded body, which extends at best over the entire wear height of the sandwich scraper.
  • Carbide core and steel jacket should together occupy a high surface area of the wear surface of the rubber body. Their area share should amount to at least 20%.
  • the sandwich scraper bar is particularly stiff and removes even stuck and verharschten snow residue from the asphalt surface.
  • the rubber body of the sandwich scraper is covered on both sides with steel plates, it is recommended for reasons of weight, to dispense with a separate mounting neck and instead to use at least one of the two steel plates at the same time as a mounting neck.
  • the wear surface is composed in cross section of a seven-layer sandwich.
  • the individual layers are - contrary to the direction of advance of the plow blade - the steel of the rear steel plate, the rubber of the rubber body, the steel of the steel shell, the hard metal of the hard metal core, the steel of the steel shell, the rubber of the rubber body and the steel of the front steel plate.
  • the sandwich is therefore symmetrical and effectively protects the brittle core against impacts.
  • the sandwich scraper 0 shows a first embodiment of the sandwich scraper strip 0 according to the invention in cross-section, ie substantially transversely to the direction of travel or to the feed direction V.
  • the sandwich scraper 0 comprises a steel attachment collar 1, via which it is attached to a non-illustrated Dozer blade of a snow plow, also not shown, can be attached.
  • the attachment is usually by Screw connections or by means of clamping claws; Further joining techniques are conceivable.
  • the sandwich scraper 0 comprises a rubber body 4, which is vulcanized to the mounting neck 1. Rubber has proven itself as a material, but it is nevertheless possible to substitute it with a suitable plastic.
  • a steel shell 5 is embedded, which surrounds one or more hard metal cores 6.
  • Both the steel jacket 5 and the hard metal cores 6 can extend continuously over the entire length of the sandwich scraper bar 0. Preferably, however, they are interrupted in sections.
  • the hard metal cores 6 each extend at least over the wear height h of the scraper blade 0.
  • Steel jacket 5 and hard metal core 6 together make up at least one fifth of the wear surface 7 of the rubber body 4.
  • the hard metal cores 6 are preferably made of tungsten carbide, titanium carbide or titanium nitride. These materials can also be used as recyclate.
  • the hard metal cores 6 is either shrunk into the steel shell 5 and / or soldered to it.
  • the steel jacket 5 is, however, vulcanized into the rubber body 4.
  • the sandwich scraper 0 is formed by a five-ply, symmetrical sandwich.
  • the sandwich consists of the materials rubber, steel, carbide, steel, rubber.
  • FIG. 2 shows a further embodiment of the sandwich scraper strip 0 according to the invention according to claim 8 in a cross section Q. It comprises two steel plates 2, 3 which cover the rubber body 4 on its front side or on its rear side.
  • the front steel plate 2 is largely flat, the rear steel plate 3 is cranked.
  • Both steel plates 2,3 are connected by vulcanization with the rubber body 4 and also serve as a fastening neck 1. For this reason, they have in the upper part of holes 8, through which bolts, not shown, are inserted for attachment to the dozer blade.
  • the sandwich scraper blade 0 is constituted by a seven-layer symmetrical sandwich.
  • the sandwich consists of the materials steel, rubber, steel, carbide, steel, rubber, steel.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Structures (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Table Equipment (AREA)
  • Cleaning Of Streets, Tracks, Or Beaches (AREA)
  • Earth Drilling (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention relates to a sandwich scraper strip for the blade of a snowplow and provided at the top with a steel fastening neck onto which a rubber body having at least one embedded hard material body is molded. According to the invention, the hard material body is provided in the form of a hard metal core surrounded by a steel jacket. This results in achieving a surprisingly high serviceable life of the sandwich scraper blade.

Description

Die vorliegende Erfindung betrifft eine Sandwich-Räumleiste für den Räumschild eines Schneepfluges, die oben mit einem stählernen Befestigungshals versehen ist, an welchem ein Gummikörper mit mindestens einem eingebetteten Hartstoffkörper anvulkanisiert ist. Eine solche Sandwich-Räumleiste ist aus der DE 34 04 030 C1 bekannt.The present invention relates to a sandwich scraper blade for the plow blade of a snow plow, which is provided above with a steel mounting neck, on which a rubber body is vulcanized with at least one embedded hard material body. Such a sandwich scraper is out of the DE 34 04 030 C1 known.

Bei den Hartstoffkörpern der vorgenannten Sandwich-Räumleiste handelt es sich um stab- oder plattenförmige Formkörper, die vorzugsweise aus gesintertem oder gegossenem Korund bestehen. Solche Sandwich-Räumleisten haben sich hervorragend bewährt.The hard material bodies of the aforementioned sandwich scraper are rod-shaped or plate-shaped molded bodies, which preferably consist of sintered or cast corundum. Such sandwich scrapers have proven to be excellent.

Aus der US 3 934 654 ist eine Räumleiste für den Schild einer Baumaschine bzw. für einen Schneepflug bekannt, die eine stählerne Schürfleiste aufweist, an deren Unterseite eine Mehrzahl von Stahlsegmenten angeschraubt sind. Die Stahlsegmente sind vorzugsweise aus einem Werkzeugstahl geschmiedet, der eine höhere Verschleißfestigkeit als der Stahl der Schürfleiste aufweist. Im Bereich der zum Boden gewandten Verschleißfläche sind V-förmige Hartmetallkerne in die Stahlsegmente eingesetzt.From the US 3,934,654 a scraper for the shield of a construction machine or for a snow plow is known, which has a steel scraper, on the underside of a plurality of steel segments are screwed. The steel segments are preferably forged from a tool steel having a higher wear resistance than the steel of the scraper. In the area of the wear surface facing the ground, V-shaped cemented carbide cores are inserted into the steel segments.

Im Gegensatz zu den eingangs beschriebenen Sandwich-Räumleisten ist die mit Hartmetallkernen versehene, vollmetallische Räumleiste amerikanischer Bauart für deutsche Straßen zu aggressiv. Bei der in Deutschland üblichen Schwarzräumung würden die Hartmetallkante die Asphaltoberfläche beschädigen. Um dem vorzubeugen, müsste eine Weißräumung erfolgen, bei der eine dünne Schneeschicht auf der Straße zurückgelassen wird. Dies entspricht allerdings nicht den Vorgaben des deutschen Winterdienstes.In contrast to the above-described Sandwich-Räumleisten provided with carbide cores, full metal scraper American style for German roads is too aggressive. In the usual black clearance in Germany, the carbide edge would damage the asphalt surface. To prevent this, a white clearance would have to take place, at a thin layer of snow is left on the road. However, this does not comply with the specifications of the German winter service.

Darüber hinaus ist die nach unten vorstehende Kante des Hartmetallkerns Schlägen ungeschützt ausgesetzt. So besteht die Gefahr, dass eine nur geringfügig über die Straßenoberfläche hervorstehende Schachtabdeckung oder Brückenfuge gegen den spröden Hartmetallkern stößt und Teile von ihm herausbricht. Abgesehen von diesen Nachteilen weisen Vollstahl-Räumleisten mit Hartmetallkern ein gutes Verschleißverhalten auf.In addition, the downwardly projecting edge of the carbide core is exposed to impacts unprotected. Thus, there is the danger that a manhole cover or bridge joint projecting only slightly beyond the road surface will butt against the brittle hard metal core and break off parts of it. Aside from these disadvantages, all-steel carbide core scrapers have good wear performance.

Ausgehend von dem vorstehend beschriebenen Stand der Technik liegt der vorliegenden Erfindung die Aufgabe zugrunde, eine Räumleiste anzugeben, die einem geringen Verschleiß ausgesetzt ist, eine entsprechend hohe Standzeit aufweist, die Straßendecke nicht beschädigt und sich auch zur Schwarzräumung der Straße eignet.Based on the above-described prior art, the present invention seeks to provide a scraper, which is exposed to low wear, has a correspondingly long service life, does not damage the road surface and is also suitable for blackout of the road.

Dies gelingt mit einer Sandwich-Räumleiste der eingangs genannten Art, bei der als Hartstoffkörper ein Hartmetallkern vorgesehen wird, der von einem Stahlmantel umgeben ist.This is achieved with a sandwich scraper of the type mentioned, in which a hard metal core is provided as a hard material body, which is surrounded by a steel shell.

Überraschenderweise hat sich gezeigt, dass die in der Räumleiste gemäß der Erfindung verwendeten Hartmetallkerne mit einer allseitigen Stahlarmierung ein deutlich besseres Verschleißverhalten zeigen, als die bisher erfolgreich eingesetzten Hartstoffkörper aus Korund. Dies kann damit erklärt werden, dass der spröde Korund trotz des dämpfenden Gummikörpers Schlägen ausgesetzt ist, die Teile des Hartstoffkörpers ausbrechen lassen. Dies gilt insbesondere für die Grenzbereiche zwischen Gummi und Korund.Surprisingly, it has been shown that the hard metal cores used in the scraper strip according to the invention with a steel reinforcement on all sides show a significantly better wear behavior than the corundum hard bodies previously used successfully. This can be explained by the fact that the brittle corundum, in spite of the damping rubber body, is exposed to blows which cause parts of the hard material body to break out. This is especially true for the border areas between rubber and corundum.

Die schlagempfindlichen Kanten des Hartmetalls hingegen werden bei der erfindungsgemäßen Sandwich-Räumleiste von der zähen Stahlummantelung geschützt, die ihrerseits wiederum von dem dämpfenden Gummikörper umgeben ist. Erste Prüfstand-Versuche zeigen, dass die Laufleistung einer erfindungsgemäßen Sandwich-Räumleiste erheblich höher liegt als eine herkömmliche Sandwich-Räumleiste mit einem Hartstoffkörper aus Korund.The shock-sensitive edges of the hard metal, however, are protected in the sandwich scraper strip according to the invention of the tough steel casing, which in turn is surrounded by the damping rubber body. First test bench tests show that the mileage of a sandwich scraper according to the invention is considerably higher than a conventional sandwich scraper with a corundum hard body.

Anders als bei Vollstahl-Räumleisten wird die Asphaltoberfläche von erfindungsgemäßen Sandwich-Räumleisten mit Hartmetallkern nicht merklich beschädigt.Unlike full steel scraper bars, the asphalt surface of sandwich scraper bars with hard metal core according to the invention is not appreciably damaged.

Selbstverständlich muss der Hartmetallkern fest in dem Stahlmantel verankert werden. Dies kann kraftschlüssig - wie beispielsweise durch Einschrumpfen - und/oder stoffschlüssig - wie beispielsweise durch Löten - erfolgen.Of course, the hard metal core must be firmly anchored in the steel shell. This can be non-positively - such as by shrinking - and / or cohesively - such as by soldering - done.

Ein weiterer Vorteil der erfindungsgemäßen Verwendung eines Stahlmantels steht indessen besserer Wärmeverteilung. Durch das Reiben des Hartmetallkerns auf dem Asphalt entsteht viel Wärme, die über großflächige Grenzflächen vom Stahl in den Gummi übertragen werden. Da somit örtliche Überhitzungen des Gummis vermieden werden, entsteht deutlich weniger Verschleiß als beim direkten Einbetten von Hartmetallkernen in den Gummi.However, a further advantage of the use according to the invention of a steel jacket is better heat distribution. The rubbing of the carbide core on the asphalt produces a lot of heat, which is transferred from the steel to the rubber via large surface areas. As a result, local overheating of the rubber is avoided, resulting in significantly less wear than when directly embedding hard metal cores in the rubber.

Hartmetalle sind vergleichsweise teure Werkstoffe. Die Kosten der Sandwich-Räumleiste können erheblich gesenkt werden, indem man Hartmetallkerne aus rezykliertem Hartmetall verwendet. Dabei handelt es sich um aufbereitetes Altmaterial von verschlissenen Werkzeugen der spanenden Bearbeitung. So lassen sich beispielsweise Hartmetall-Wendeplatten, die in Drehmeißeln oder Fräsköpfen eingesetzt werden, nach Ablauf ihrer Standzeit in der spanenden Bearbeitung in der erfindungsgemäßen Sandwich-Räumleiste als Hartmetallkern wiederverwerten.Carbides are comparatively expensive materials. The cost of the sandwich scraper can be significantly reduced by using carbide cores made from recycled carbide. This is processed waste material from worn tools of machining. Thus, for example, carbide inserts that are used in turning tools or milling heads, recycled after their life in the machining in the sandwich scraper strip according to the invention as a hard metal core.

Vorzugsweise wird der Stahlmantel bzw. der Hartmetallkern als ein stab- oder plattenförmiger Formkörper ausgebildet, der sich günstigenfalls über die gesamte Verschleißhöhe der Sandwich-Räumleiste erstreckt.Preferably, the steel shell or the hard metal core is formed as a rod-shaped or plate-shaped molded body, which extends at best over the entire wear height of the sandwich scraper.

Hartmetallkern und Stahlmantel sollen gemeinsam einen hohen Flächenanteil der Verschleißfläche des Gummikörpers einnehmen. Ihr Flächenanteil soll mindestens 20 % betragen.Carbide core and steel jacket should together occupy a high surface area of the wear surface of the rubber body. Their area share should amount to at least 20%.

Eine vorteilhafte Weiterbildung besteht darin, den Gummikörper an seiner Vorderseite und an seiner Rückseite mit Stahlplatten abzudecken. Hierdurch wird die Sandwich-Räumleiste besonders steif und nimmt selbst festgefahrenen und verharschten Schnee rückstandslos von der Asphaltdecke ab.An advantageous development is to cover the rubber body on its front and on its back with steel plates. hereby The sandwich scraper bar is particularly stiff and removes even stuck and verharschten snow residue from the asphalt surface.

Sofern der Gummikörper der Sandwich-Räumleiste von beiden Seiten mit Stahlplatten abgedeckt ist, empfiehlt es sich aus Gewichtsgründen, auf einen gesonderten Befestigungshals zu verzichten und statt dessen zumindest eine der beiden Stahlplatten zugleich als Befestigungshals zu nutzen.If the rubber body of the sandwich scraper is covered on both sides with steel plates, it is recommended for reasons of weight, to dispense with a separate mounting neck and instead to use at least one of the two steel plates at the same time as a mounting neck.

Die beste Funktionalität entfaltet eine Räumleiste, deren Verschleißfläche sich im Querschnitt aus einem siebenlagigen Sandwich zusammensetzt. Die einzelnen Lagen sind - entgegen der Vorschubrichtung des Räumschildes gesehen - der Stahl der hinteren Stahlplatte, der Gummi des Gummikörpers, der Stahl des Stahlmantels, das Hartmetall des Hartmetallkerns, der Stahl des Stahlmantels, der Gummi des Gummikörpers und der Stahl der vorderen Stahlplatte. In Bezug auf den Hartmetallkern ist das Sandwich also symmetrisch aufgebaut und schützt den spröden Kern wirksam vor Schlägen.The best functionality unfolds a scraper, the wear surface is composed in cross section of a seven-layer sandwich. The individual layers are - contrary to the direction of advance of the plow blade - the steel of the rear steel plate, the rubber of the rubber body, the steel of the steel shell, the hard metal of the hard metal core, the steel of the steel shell, the rubber of the rubber body and the steel of the front steel plate. In terms of the hard metal core, the sandwich is therefore symmetrical and effectively protects the brittle core against impacts.

Die vorliegende Erfindung soll nun anhand eines Ausführungsbeispiels näher erläutert werden. Hierzu zeigen:

Fig. 1:
Sandwich-Räumleiste im Querschnitt;
Fig. 2:
Sandwich-Räumleiste mit beidseitigen Stahlplatten im Querschnitt Q;
Fig.3:
Sandwich-Räumleiste mit beidseitigen Stahlplatten in Vorderansicht.
The present invention will now be explained in more detail with reference to an embodiment. Show:
Fig. 1:
Sandwich scraper in cross section;
Fig. 2:
Sandwich scraper with double-sided steel plates in cross-section Q;
Figure 3:
Sandwich scraper with two-sided steel plates in front view.

Figur 1 zeigt eine erste Ausführungsform der erfindungsgemäßen Sandwich-Räumleiste 0 im Querschnitt, also im Wesentlichen quer zur Fahrt-, bzw. zur Vorschubrichtung V. An ihrer Oberseite umfasst die Sandwich-Räumleiste 0 einen stählerner Befestigungshals 1, über welchen sie an einem nicht dargestellten Räumschild eines ebenfalls nicht dargestellten Schneepfluges befestigt werden kann. Die Befestigung erfolgt in der Regel durch Verschraubungen oder mittels Klemmpratzen; weitere Fügetechniken sind denkbar.1 shows a first embodiment of the sandwich scraper strip 0 according to the invention in cross-section, ie substantially transversely to the direction of travel or to the feed direction V. On its upper side, the sandwich scraper 0 comprises a steel attachment collar 1, via which it is attached to a non-illustrated Dozer blade of a snow plow, also not shown, can be attached. The attachment is usually by Screw connections or by means of clamping claws; Further joining techniques are conceivable.

Des Weiteren umfasst die Sandwich-Räumleiste 0 einen Gummikörper 4, der an dem Befestigungshals 1 anvulkanisiert ist. Gummi hat sich als Werkstoff bewährt, allerdings ist es gleichwohl möglich, ihn durch einen geeigneten Kunststoff zu substituieren.Furthermore, the sandwich scraper 0 comprises a rubber body 4, which is vulcanized to the mounting neck 1. Rubber has proven itself as a material, but it is nevertheless possible to substitute it with a suitable plastic.

In den Gummikörper 4 ist ein Stahlmantel 5 eingebettet, der einen oder mehrere Hartmetallkerne 6 umgibt. Sowohl der Stahlmantel 5, als auch die Hartmetallkerne 6 können sich durchgehend über die gesamte Länge der Sandwich-Räumleiste 0 erstrecken. Vorzugsweise sind sie jedoch abschnittsweise unterbrochen. Die Hartmetallkerne 6 erstrecken sich jeweils mindestens über die Verschleißhöhe h der Räumleiste 0. Stahlmantel 5 und Hartmetallkern 6 machen zusammen mindestens ein Fünftel der Verschleißfläche 7 des Gummikörpers 4 aus.In the rubber body 4, a steel shell 5 is embedded, which surrounds one or more hard metal cores 6. Both the steel jacket 5 and the hard metal cores 6 can extend continuously over the entire length of the sandwich scraper bar 0. Preferably, however, they are interrupted in sections. The hard metal cores 6 each extend at least over the wear height h of the scraper blade 0. Steel jacket 5 and hard metal core 6 together make up at least one fifth of the wear surface 7 of the rubber body 4.

Die Hartmetallkerne 6 bestehen bevorzugt aus Wolframcarbid, Titancarbid oder Titannitrid. Diese Werkstoffe können auch als Rezyklat verwendet werden. Die Hartmetallkerne 6 wird entweder in den Stahlmantel 5 eingeschrumpft und/oder mit ihm verlötet. Der Stahlmantel 5 wird indes in den Gummikörper 4 einvulkanisiert.The hard metal cores 6 are preferably made of tungsten carbide, titanium carbide or titanium nitride. These materials can also be used as recyclate. The hard metal cores 6 is either shrunk into the steel shell 5 and / or soldered to it. The steel jacket 5 is, however, vulcanized into the rubber body 4.

In der zur Straßenoberfläche gewandten Verschleißfläche 7 des Gummikörpers 4 wird die Sandwich-Räumleiste 0 von einem fünflagigen, symmetrischen Sandwich gebildet. Das Sandwich besteht aus den Werkstoffen Gummi, Stahl, Hartmetall, Stahl, Gummi.In the facing to the road surface wear surface 7 of the rubber body 4, the sandwich scraper 0 is formed by a five-ply, symmetrical sandwich. The sandwich consists of the materials rubber, steel, carbide, steel, rubber.

Figur 2 zeigt eine weitere Ausführungsform der erfindungsgemäßen Sandwich-Räumleiste 0 gemäß Anspruch 8 in einen Querschnitt Q. Sie umfasst zwei Stahlplatten 2, 3, die den Gummikörper 4 an seiner Vorderseite bzw, an seiner Rückseite abdecken. Die vordere Stahlplatte 2 ist weitestgehend plan, die hintere Stahlplatte 3 ist gekröpft. Beide Stahlplatten 2,3 sind durch Vulkanisation mit dem Gummikörper 4 verbunden und dienen zugleich als Befestigungshals 1. Aus diesem Grunde weisen sie im oberen Bereich Bohrungen 8 auf, durch welche nicht dargestellte Schraubbolzen zwecks Befestigung an dem Räumschild gesteckt werden.FIG. 2 shows a further embodiment of the sandwich scraper strip 0 according to the invention according to claim 8 in a cross section Q. It comprises two steel plates 2, 3 which cover the rubber body 4 on its front side or on its rear side. The front steel plate 2 is largely flat, the rear steel plate 3 is cranked. Both steel plates 2,3 are connected by vulcanization with the rubber body 4 and also serve as a fastening neck 1. For this reason, they have in the upper part of holes 8, through which bolts, not shown, are inserted for attachment to the dozer blade.

In der zur Straßenoberfläche gewandten Gesamt-Verschleißfläche (d.h. die Verschleißfläche 7 des Gummikörpers 4 zuzüglich der Verschleißflächen der äußeren Stahlplatten 2, 3) wird die Sandwich-Räumleiste 0 gemäß Anspruch 8 von einem siebenlagigen, symmetrischen Sandwich gebildet. Das Sandwich besteht aus den Werkstoffen Stahl, Gummi, Stahl, Hartmetall, Stahl, Gummi, Stahl.In the total surface wear surface facing the road surface (i.e., the wearing surface 7 of the rubber body 4 plus the wear surfaces of the outer steel plates 2, 3), the sandwich scraper blade 0 according to claim 8 is constituted by a seven-layer symmetrical sandwich. The sandwich consists of the materials steel, rubber, steel, carbide, steel, rubber, steel.

In der teilweise aufgebrochenen Vorderansicht der zweiten Ausführungsform gemäß Anspruch 8 (Figur 3) ist erkennbar, dass mehrere plattenförmige Stahlmäntel 5 unter Einhaltung eines gewissen Abstandes d nebeneinander angeordnet sind. In jedem Stahlmantel 5 sind jeweils drei quaderförmige Hartmetallkerne 6 eingeschrumpft.In the partially broken front view of the second embodiment according to claim 8 (Figure 3) it can be seen that a plurality of plate-shaped steel shells 5 are arranged adjacent to each other while maintaining a certain distance d. In each steel shell 5, three parallelepiped hard metal cores 6 are shrunk.

Claims (10)

  1. A sandwich scraper bar for the scraper blade of a snowplough, which is provided at the top with a steel fixing neck (1) to which a rubber body (4) with at least one hard material body embedded in the rubber body (4) is vulcanised, characterised in that the hard material body is a hard metal core (6) surrounded by a steel casing (5).
  2. A sandwich scraper bar according to claim 1 characterised in that the hard metal core (6) is held in force-locking relationship in the steel casing (5).
  3. A sandwich scraper bar according to claim 1 characterised in that the hard metal core (6) is held in material-locking relationship in the steel casing (5).
  4. A sandwich scraper bar according to one of claims 1 to 3 characterised in that the hard metal core (6) comprises recycled hard metal.
  5. A sandwich scraper bar according to one of claims 1 to 4 characterised in that the steel casing (5) is in the form of a shaped body in rod or plate form, which extends at least over the entire wearing height (h) of the sandwich scraper bar (0).
  6. A sandwich scraper bar according to one of claims 1 to 5 characterised in that the hard metal core (6) is in the form of a shaped body in rod or plate form, which extends at least over the entire wearing height (h) of the sandwich scraper bar (0).
  7. A sandwich scraper bar according to one of claims 1 to 6 characterised in that the common surface proportion of the steel casing (5) and the hard metal core (6) constitutes at least 20% of the wearing surface (7) of the rubber body (4).
  8. A sandwich scraper bar according to one of claims 1 to 7 characterised in that the rubber body (4) is covered with steel plates (2, 3) at its front side and at its rear side.
  9. A sandwich scraper bar according to claim 8 characterised in that at least one of the two steel plates (2, 3) serves at the same time as the fixing neck (1).
  10. A sandwich scraper bar according to claim 8 or claim 9 characterised in that the sandwich scraper bar (0) has at least a cross-section (Q) in which the following materials in the advance direction of the snowplough, at the entire wearing surface, form a seven-layer sandwich:
    a) steel of the rear steel plate (3) of the two steel plates (2, 3);
    b) rubber of the rubber body (4);
    c) steel of the steel casing (5);
    d) hard metal of the hard metal core (6);
    e) steel of the steel casing (5);
    f) rubber of the rubber body (4); and
    g) steel of the front steel plate (2) of the two steel plates (2, 3).
EP05752722A 2004-06-17 2005-05-25 Sandwich scraper strip having a hard metal core Active EP1776506B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05752722T PL1776506T3 (en) 2004-06-17 2005-05-25 Sandwich scraper strip having a hard metal core

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004029165A DE102004029165A1 (en) 2004-06-17 2004-06-17 Sandwich scraper with tungsten carbide core
PCT/EP2005/005630 WO2005124031A1 (en) 2004-06-17 2005-05-25 Sandwich scraper strip having a hard metal core

Publications (2)

Publication Number Publication Date
EP1776506A1 EP1776506A1 (en) 2007-04-25
EP1776506B1 true EP1776506B1 (en) 2007-12-19

Family

ID=34970582

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05752722A Active EP1776506B1 (en) 2004-06-17 2005-05-25 Sandwich scraper strip having a hard metal core

Country Status (9)

Country Link
US (1) US7765726B2 (en)
EP (1) EP1776506B1 (en)
AT (1) ATE381641T1 (en)
CA (1) CA2570517C (en)
DE (2) DE102004029165A1 (en)
ES (1) ES2301019T3 (en)
NO (1) NO338286B1 (en)
PL (1) PL1776506T3 (en)
WO (1) WO2005124031A1 (en)

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Also Published As

Publication number Publication date
NO20070261L (en) 2007-03-09
ES2301019T3 (en) 2008-06-16
WO2005124031A1 (en) 2005-12-29
DE502005002314D1 (en) 2008-01-31
CA2570517A1 (en) 2005-12-29
NO338286B1 (en) 2016-08-08
US20070193755A1 (en) 2007-08-23
US7765726B2 (en) 2010-08-03
EP1776506A1 (en) 2007-04-25
DE102004029165A1 (en) 2005-12-29
PL1776506T3 (en) 2008-06-30
ATE381641T1 (en) 2008-01-15
CA2570517C (en) 2013-07-30

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