EP3553227B1 - Extractor tool for maintenance of tennis court - Google Patents

Extractor tool for maintenance of tennis court Download PDF

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Publication number
EP3553227B1
EP3553227B1 EP19167128.8A EP19167128A EP3553227B1 EP 3553227 B1 EP3553227 B1 EP 3553227B1 EP 19167128 A EP19167128 A EP 19167128A EP 3553227 B1 EP3553227 B1 EP 3553227B1
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EP
European Patent Office
Prior art keywords
edge
doctor blade
end portion
scraper blade
handle
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EP19167128.8A
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German (de)
French (fr)
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EP3553227A1 (en
Inventor
Mirko Girke
Alexander Mostafa
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Optitenn GmbH
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Optitenn GmbH
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    • 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
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/08—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades
    • E01C23/082—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades using non-powered tools

Definitions

  • the present invention relates to a pulling device according to claim 1 with a scraper for removing played and weathered material from a tennis court ceiling.
  • Tennis is played on different surfaces.
  • the common types of tennis courts are sand, hard and grass.
  • Most clay courts have a brick flour cover that requires regular maintenance.
  • Brick meal is obtained by grinding bricks and is often a recycled product made from crushed bricks.
  • the top layer of a tennis court ceiling is affected by mechanical stress during play as well as by the effects of the weather.
  • moss spreads over time on permanently damp and rarely used areas of a sand court, which penetrates the top layer of soil and changes the ball bounce.
  • a tennis court is also exposed to rain, snow, and changes in frost and dew, which deteriorate the quality of the top layer of a tennis court ceiling.
  • a repair of the tennis court ceiling is therefore an absolute prerequisite for restoring the playability of a clay court.
  • top soil layer also known as the top layer
  • the mechanical stress described above changes the structure and grain size of the top soil layer, also known as the top layer, in conjunction with the effects of the weather.
  • the proportion of fine grain in the top soil layer increases.
  • foreign particles from the air as well as organic residues and organisms are also deposited in the surface layer. In order to achieve the desired playability, this wearing layer must therefore be removed in the spring before the start of each new tennis season and replaced with a new application.
  • the worn and weathered top layer of the floor covering is first removed.
  • This wear layer can be removed by hand or by machine.
  • the old material that forms the worn top layer is usually removed with scrapers.
  • the material loosened in this way is then removed with a scraper.
  • several parallel grooves are first milled into the top layer and the old material is then removed with a broom or scraper.
  • a pull-off device in which a vertically aligned doctor blade is rigidly attached to a frame supported by rollers.
  • the position of the blade can be adjusted to the desired removal depth by means of adjusting screws arranged on the frame, which is usually approx. 1 to 3 mm.
  • the blade is arranged at an angle to the direction of travel of the rollers, so that material loosened by the blade is transported to the side.
  • the arrangement enables the wear layer to be removed evenly regardless of the skill of an operator, the physical strain on the operator being essentially limited to pulling the device with sufficient force to detach the cover layer. With the device, approx. 2 clay courts can be deducted per day.
  • the scraper In order to enable an even and complete removal of the wear layer, the scraper must be set exactly horizontal on the one hand and on the other hand so that the removal depth corresponds to the thickness of the cover layer to be removed. If the removal depth is less than the thickness of the top layer to be removed, the wear layer is only partially removed, so that reworking is necessary. If the depth of removal is greater than the thickness of the top layer to be removed, part of the underlying soil layer is removed in addition to the wear layer, so that more material is required to rebuild the top layer.
  • a pulling device which has a pulling ruler which is arranged between two support devices and attached to these in a height-adjustable manner.
  • a roller by means of which the device is on two rulers or other guide aids such as a curb can be moved.
  • each of the support devices furthermore has a forwardly projecting scanning edge designed to be supported on the respective guide aid.
  • Each of the support devices is also connected via a vertical spindle drive to one of the lateral ends of the leveling rule, whereby the height of the cutting edge of the leveling rule can be adjusted relative to the guide aids.
  • Laying guide aids on tennis courts in order to be able to pull them off in lengths means a very high expenditure of material and time.
  • a tangent to the circumference of the rolling device touching the first edge of the scraper blade, closes with the scraper blade in the area of the first edge an angle in the range from 20 to 70 degrees, in particular in the range from 30 to 60 degrees and in particularly preferred embodiments in the range of 40 to 50 degrees.
  • the tangent corresponds to the surface of the tennis court ceiling.
  • the angle between the back of the scraper blade in the area of the first edge and the tangent is 45 degrees. This not only keeps the effort required to remove a wearing layer low, but also reduces the likelihood that the scraper blade will dig into the ground or lift off the ground during removal.
  • the first edge resting on the floor during use is referred to below as the floor edge
  • the second edge located above the floor during use is referred to as the top edge.
  • the top edge can, but does not have to, run parallel to the bottom edge. For example, it can have segments which are arranged at an angle to one another, or can be curved, for example in order to improve the rigidity of the scraper blade.
  • the bottom edge on the other hand, is always straight and aligned so that when the device is placed on the ground, it is over its rests on the floor over the entire length.
  • the top edge is formed parallel to the bottom edge and has one or more bends in the direction of the front of the scraper blade.
  • the two end areas of the handle are formed at an angle to one another, the end area of the handle attached to the scraper blade preferably being aligned parallel to the tangent indicated above and the other end area of the handle facing upwards away from the scraper blade, i.e. H. away from the tangent, points.
  • the connection between the two end regions can be rigid, adjustable, rigid or articulated.
  • An articulated connection facilitates handling because vertical forces exerted on the handle by a user are not transmitted to the scraper blade.
  • at least a segment of the connection is adjustable in length.
  • the end region of the handle attached to the scraper blade advantageously extends beyond the bottom edge, as a result of which the device can be pulled evenly without changing the contact force.
  • a receptacle can be formed which, for. B. allows the attachment of weights to adjust the bearing force of the bottom edge.
  • the contact force can be adapted to the nature of the wear layer to be removed without burdening the operator.
  • a handle is attached to the free end of the handle, which facilitates handling.
  • the handle comprises a transverse handle, which makes it easier to pull the device.
  • handle applications can be attached to the ends of the crossbar, which enable more ergonomic gripping.
  • the scraper blade is advantageously constructed in two parts, a scraper blade shield and a floor knife attached to the lower edge of the scraper blade shield.
  • the floor knife can be arranged adjacent to the lower edge of the shield or protruding beyond the lower edge.
  • the angle between the bottom edge of the bottom knife resting on the ground and the scraper blade in the area of the first edge preferably corresponds to the inclination of this area of the scraper blade shield with respect to the Tangent, so that the bottom edge is oriented parallel to the surface of the tennis court ceiling when in use.
  • the floor knife is detachably attached to the scraper blade in order to enable a worn floor knife to be replaced or regrinded.
  • FIG. 1 shows a stripping device 1 for tennis court covers, also called a scraper, according to a first embodiment.
  • the pulling device comprises a scraper blade 10, which has a scraper blade shield 11 and a floor knife 12 attached thereto.
  • a frame 20 is attached to the rear of the scraper blade shield 11 and connects the scraper blade 10 to a rolling device 30 comprising two wheels 31 and 32.
  • the axes of the two wheels 31 and 32 lie on the same line within the usual tolerances.
  • the frame 20 enables the scraper blade shield 11 to pivot about the wheel axles.
  • the main part of the scraper blade shield 11 is flat and ends on the side facing the soil to be removed in a lower edge 15 running parallel to the axes of the two wheels 31 and 32.
  • the upper edge 16 of the scraper blade shield 11 opposite the lower edge also runs parallel to the wheel axles, but in contrast to the lower edge it is profiled in order to improve the rigidity of the shield 11.
  • the profile is created by bending the shield twice in the direction of its front side, that is the side of the scraper blade shield 11 facing away from the wheels 31 and 32 Figure 1
  • the top edge 16 which can be seen twice forwards bent over, makes the scraper blade shield 11 significantly more torsion-resistant, an upper edge 16 designed in this way also preventing that scraped sand falls over the upper edge back onto the top layer of soil that has already been scraped off.
  • a floor knife 12 is detachably attached to the underside of the scraper blade shield 11, for example with the aid of screws.
  • the floor knife 12 can also be firmly attached, for example by gluing or welding.
  • the floor knife 12 is attached to the front of the scraper blade shield 11. As a result, when a wear layer is removed, the floor knife is pressed against the scraper blade shield 11 and supported by it.
  • the bottom knife 12 can also be attached to the rear of the scraper blade shield 11. In these cases, however, the floor knife 12 is pushed away from the scraper blade shield 11 when a cover layer is removed, so that a correspondingly solid design of the fastening is required.
  • the lower edge 17 of the floor knife 12 protrudes beyond the lower edge of the scraper blade 11.
  • the lower edge of the bottom knife 12 functioning as a scraping edge is called bottom edge 17 of the scraper blade 10 in the following.
  • the connection between the rolling device 30 and the scraper blade 10 implemented via the frame 20 runs horizontally to the floor surface 2 on which the device 1 in the FIG Figure 1 ready for use position shown.
  • the mean length of the radial connection from the axis of the rolling device (wheel axles) to the rear of the scraper blade 10 is called the pivot radius r.
  • the scraper blade 10 is inclined with respect to the pivot radius r, the angle ⁇ 'between the scraper blade 10 and the pivot radius r being smaller than 90 degrees and greater than 0 degrees, so that the distance between the axes of the two wheels 31 and 32 forming the rolling device 30 to the bottom edge 17 is greater than the distance to the top edge 16 of the scraper blade 10.
  • the angle ⁇ 'between the scraper blade 10 and the pivot radius r corresponds to the angle ⁇ between the scraper blade and the floor on which the puller rests. If the pivot radius r determined by the frame 20 does not run as in FIG Figure 1 illustrated first embodiment parallel to the tangent to the rolling device 30 which touches the bottom edge, then ⁇ 'and a are different. If ⁇ 'is greater than a, the contact pressure of the bottom edge is greater, if ⁇ ' is less than a, the contact pressure is the Bottom edge smaller than in the first embodiment.
  • the angle ⁇ 'therefore offers the possibility of achieving the desired bearing force of the bottom edge even with scraper blades of different weights. In some configurations of the device 1, the connection is therefore designed in such a way that the angle ⁇ 'can be adjusted.
  • the frame 20 has the shape of an Ms, the legs and V-tip of which are connected to an L-profile strip, which in turn is connected to the back of the scraper blade shield 11 at approximately half the height .
  • the connection of the individual components of the frame 20 to one another and of the frame 20 to the scraper blade shield 11 is preferably carried out by welding.
  • the wheels 31 and 32 are attached to the legs of the M-shaped frame 20, preferably at the level of the connection to the V-shaped part of the frame 20 enclosed by the legs.
  • the wheels 31 and 32 are preferably equipped with wide tires so that they leave no traces in the soil exposed by the erosion.
  • the spacing of the outer sides of the wheels 31 and 32 from one another is preferably less than the width of the scraper blade 10, i. H. its extent parallel to the axis line of the rolling device 30.
  • a receptacle 13 for fastening a handle 40 is attached in the middle with respect to the width of the shield 11.
  • another receptacle configuration can also be selected, for example a double receptacle for a forked handle. It is important, however, that the application of force runs centrally to the shield 11 so that no torsional forces are exerted on the shield in the horizontal direction.
  • the receptacle 13 is designed in such a way that the end region 41 inserted into it is aligned parallel to the tangent described above, ie when used as intended, parallel to the surface of the tennis court ceiling.
  • the receptacle has a locking pin 14 which is guided through the receptacle and the handle inserted therein in order to releasably connect the handle and scraper blade 10 to one another.
  • the receptacle 13 and the securing pin 14 form a plug-in system with a form-fitting securing which enables the handle 40 to be easily mounted on the roller-supported scraper unit.
  • the stem 40 has a further segment 42 which is rigidly connected to the end area 41 via an open square 43 such that the segment 41 and the segment 42 enclose an angle ⁇ which is preferably equal to 90 ° + ⁇ or is a little smaller.
  • the angle ⁇ between the two segments 41 and 42 of the handle 40 is approximately 135 ° and more preferably 130 °.
  • the length of the first segment 41 preferably extends beyond the bottom edge 17, so that the contact pressure of the bottom edge 17 can be increased in a simple manner by means of a weight attached to the square.
  • the rigid connection of the handle 40 to the scraper blade 10 via the receptacle 13 prevents the weight force from being transmitted to the handle part 44 of the handle.
  • the two segments of the stem can also be connected without a square 43 arranged in between.
  • the handle 40 can be curved between its two end regions 41 and 42 in order to form the angle described above between the two end regions.
  • a transverse handle 44 is attached to the end of the handle 10 that is not attached to the scraper blade 10, at the ends of which handle applications are preferably attached, which reduce the pressure exerted by pulling the device 1 on the palms of an operator.
  • the angle can also be slightly smaller than ⁇ .
  • Scraper blade shield 11 width 1350 mm, height from lower edge to first bend (45 °) of upper edge 240 mm, distance between first and second bend (90 °) of upper edge 30 mm, overhang after second bend of upper edge 25 mm, sheet steel;
  • Floor knife width 1350 mm, height 40 mm, thickness 10 mm, steel, attached to the front of the scraper blade with 5 screws;
  • Handle holder on scraper blade 11 square steel, internal dimensions 40.5 x 40.5 mm.
  • Frame 20 2 flat iron 255 x 60 x 10 mm laterally welded to flat steel angle 60 x 60 x 1095 mm, 45 ° support on both sides to the flat steel angle with square steel, bolts attached to flat iron at the height of the support serve as wheel axles; Segment 41 of the handle 40 attached to the scraper blade shield: square iron with external dimensions 40 x 40 mm, length 310 mm; Segment 42 of handle 40 attached to the scraper blade shield: steel tube, length 1100 mm; Square 43 between the two segments: steel tube with internal dimensions 41 x 41 mm; Angle ⁇ between the two segments of the stem: 130 degrees; Angle ⁇ between the scraper blade and the tangent guided from the bottom edge to the wheel circumference: 45 degrees; Angle ⁇ 'between scraper blade 10 in the area of the bottom edge and pivot radius r: 45 degrees. Wheels: plastic rims with rubber tires.
  • the removed material is carried along in front of the scraper blade and not, as in the above-mentioned prior art, discharged via one side of the scraper blade to be deposited as a debris line to the side of the pull-off surface.
  • the puller 1 With the puller 1, the post-processing of the tennis court surface that is required in the prior art after pulling is no longer necessary. In addition, a more even and even surface is achieved.
  • the force required for pulling off is lower, so that on the one hand more area can be scraped off per time, but the device can also be used to reduce the ceiling in addition to removing the wearing layer. This usually takes place in several passes, in which the pulling device 1 is pulled several times over the respective surfaces of the tennis court cover layer.

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Description

Die vorliegende Erfindung betrifft eine Abziehvorrichtung gemäß dem Patentanspruch 1 mit einem Schaber zum Abtragen von abgespieltem und verwittertem Material von einer Tennisplatzdecke.The present invention relates to a pulling device according to claim 1 with a scraper for removing played and weathered material from a tennis court ceiling.

Tennis wird auf verschiedenen Untergründen gespielt. Die gängigen Tennisplatzarten sind Sandplatz, Hartplatz, Rasenplatz. Die meisten Sandplätze besitzen eine Ziegelmehldecke, die regelmäßiger Pflege bedarf. Ziegelmehl wird durch Mahlen von Ziegelsteinen gewonnen und ist häufig ein Recyclingprodukt aus zerkleinerten Ziegelsteinen.Tennis is played on different surfaces. The common types of tennis courts are sand, hard and grass. Most clay courts have a brick flour cover that requires regular maintenance. Brick meal is obtained by grinding bricks and is often a recycled product made from crushed bricks.

Die oberste Belagsschicht einer Tennisplatzdecke wird sowohl durch die mechanische Belastung während des Spielbetriebs als auch durch Witterungseinflüsse in Mitleidenschaft gezogen. Zudem breitet sich auf dauerfeuchten und wenig bespielten Bereichen eines Sandplatzes mit der Zeit Moos aus, das die oberste Bodenschicht durchsetzt und den Ballabsprung verändert. In der Winterpause ist ein Tennisplatz ferner Regen, Schnee, Frost- und Tauwechseln ausgesetzt, wodurch sich die Beschaffenheit der obersten Belagsschicht einer Tennisplatzdecke verschlechtert. Eine Instandsetzung der Tennisplatzdecke ist daher unbedingte Voraussetzung für die Wiederherstellung der Bespielbarkeit eines Sandplatzes.The top layer of a tennis court ceiling is affected by mechanical stress during play as well as by the effects of the weather. In addition, moss spreads over time on permanently damp and rarely used areas of a sand court, which penetrates the top layer of soil and changes the ball bounce. During the winter break, a tennis court is also exposed to rain, snow, and changes in frost and dew, which deteriorate the quality of the top layer of a tennis court ceiling. A repair of the tennis court ceiling is therefore an absolute prerequisite for restoring the playability of a clay court.

Die oben beschriebene mechanische Beanspruchung verändert im Zusammenwirken mit den Witterungseinflüssen Struktur und Körnung der auch Deckschicht genannten obersten Bodenschicht. Insbesondere nimmt der Feinstkornanteil in der obersten Bodenschicht zu. Aber auch Fremdpartikel aus der Luft sowie organische Rückstände und Organismen lagern sich in der Deckschicht ein. Zur Herstellung der gewünschten Bespielbarkeit muss diese Verschleißschicht daher im Frühjahr vor Beginn einer jeden neuen Tennissaison entfernt und durch einen neuen Auftrag ersetzt werden.The mechanical stress described above changes the structure and grain size of the top soil layer, also known as the top layer, in conjunction with the effects of the weather. In particular, the proportion of fine grain in the top soil layer increases. However, foreign particles from the air as well as organic residues and organisms are also deposited in the surface layer. In order to achieve the desired playability, this wearing layer must therefore be removed in the spring before the start of each new tennis season and replaced with a new application.

Hierzu wird zunächst die abgespielte und verwitterte oberste Schicht des Bodenbelags abgetragen. Der Abtrag dieser Verschleißschicht kann von Hand, aber auch maschinell erfolgen. Bei manuell vorgenommen Abtrag wird das Altmaterial, das die verschlissene Deckschicht bildet, üblicherweise mit Schabern abgezogen. Bei Sandplätzen mit besonders hartnäckigen und vermoosten Stellen werden zum Aufrauen der Oberfläche vor dem eigentlichen Abtrag häufig Grobzahnschaber oder Scharrierer eingesetzt, die eine gezahnte Abziehkante besitzen. Das so gelockerte Material wird anschließend mit einem Schaber abgezogen. Bei einem anderen Verfahren werden in die Deckschicht zunächst mehrere zueinander parallele Furchen gefräst und das Altmaterial dann mit einem Besen oder Schaber abgezogen. Diese Verfahren sind langwierig, körperlich anstrengend und erfordern für eine sachgerechte Ausführung viel Erfahrung. Bei feuchten Plätzen, wenn ein Tennisplatz zum Beispiel im Schatten oder in einem Waldgebiet liegt, kann die Verschleißschicht mit einem klassischen Schaber oder Scharrierer mitunter überhaupt nicht mehr vorschriftsmäßig abgetragen werden, sodass die freigelegte Bodenschicht in der Regel nicht tolerierbare Unebenheiten aufweist.To do this, the worn and weathered top layer of the floor covering is first removed. This wear layer can be removed by hand or by machine. In the case of manual removal, the old material that forms the worn top layer is usually removed with scrapers. On sand pitches with particularly stubborn and mossy areas, coarse-tooth scrapers or are often used to roughen the surface before the actual removal Scharrierer used, which have a toothed peel edge. The material loosened in this way is then removed with a scraper. In another method, several parallel grooves are first milled into the top layer and the old material is then removed with a broom or scraper. These procedures are lengthy, physically demanding, and require a lot of experience to be properly performed. On damp courts, for example when a tennis court is in the shade or in a wooded area, the wearing course can sometimes no longer be removed properly with a classic scraper or scraper, so that the exposed soil layer usually has intolerable unevenness.

Um dem abzuhelfen, wurde eine Abzugsvorrichtung entwickelt, bei der eine vertikal ausgerichtete Schaberklinge an einem von Rollen gestützten Rahmen starr angebracht ist. Die Lage der Klinge kann über am Rahmen angeordnete Einstellschrauben auf die gewünschte Abtragtiefe justiert werden, die üblicherweise ca. 1 bis 3 mm beträgt. Die Klinge ist unter einem Winkel zur Fahrrichtung der Rollen angeordnet, sodass von der Klinge gelockertes Material zur Seite befördert wird. Die Anordnung ermöglicht einen von der Geschicklichkeit eines Bedieners unabhängigen gleichmäßigen Abtrag der Verschleißschicht, wobei sich die körperliche Belastung der Bedienperson im Wesentlichen auf das Ziehen des Geräts mit einer zum Ablösen der Deckschicht ausreichenden Kraft beschränkt. Mit dem Gerät können ca. 2 Sandplätze pro Tag abgezogen werden. Um einen gleichmäßigen und vollständigen Abtrag der Verschleißschicht zu ermöglichen, muss die Abziehklinge einerseits exakt horizontal und andererseits so eingestellt sein, dass die Abtragtiefe der Dicke der abzutragenden Deckschicht entspricht. Ist die Abtragtiefe kleiner als die Dicke der abzutragenden Deckschicht, dann wird die Verschleißschicht nur unvollständig abgetragen, sodass eine Nachbearbeitung erforderlich ist. Ist die Abtragtiefe größer als die Dicke der abzutragenden Deckschicht, dann wird außer der Verschleißschicht auch ein Teil der darunterliegenden Bodenschicht abgetragen, sodass mehr Material für den Wiederaufbau der obersten Belagsschicht erforderlich ist.To remedy this, a pull-off device was developed in which a vertically aligned doctor blade is rigidly attached to a frame supported by rollers. The position of the blade can be adjusted to the desired removal depth by means of adjusting screws arranged on the frame, which is usually approx. 1 to 3 mm. The blade is arranged at an angle to the direction of travel of the rollers, so that material loosened by the blade is transported to the side. The arrangement enables the wear layer to be removed evenly regardless of the skill of an operator, the physical strain on the operator being essentially limited to pulling the device with sufficient force to detach the cover layer. With the device, approx. 2 clay courts can be deducted per day. In order to enable an even and complete removal of the wear layer, the scraper must be set exactly horizontal on the one hand and on the other hand so that the removal depth corresponds to the thickness of the cover layer to be removed. If the removal depth is less than the thickness of the top layer to be removed, the wear layer is only partially removed, so that reworking is necessary. If the depth of removal is greater than the thickness of the top layer to be removed, part of the underlying soil layer is removed in addition to the wear layer, so that more material is required to rebuild the top layer.

In der DE 36 11 323 A1 wird eine Abziehvorrichtung angegeben, die ein Abziehlineal aufweist, das zwischen zwei Auflagervorrichtungen angeordnet und an diesen höhenverstellbar angebracht ist. Am hinteren Ende einer jeden der beiden Auflagervorrichtungen befindet sich eine Laufrolle, mittels derer die Vorrichtung auf zwei Lehrlatten oder anderen Führungshilfen wie beispielsweise einer Bordsteinkante verfahren werden kann. Um ein Kippen der Anordnung zu vermeiden, weist jede der Auflagervorrichtungen ferner eine nach vorne ragende, zum Abstützen an der jeweiligen Führungshilfe ausgebildete Abtastkante auf. Jede der Auflagervorrichtungen ist zudem über einen vertikalen Spindeltrieb mit einem der seitlichen Enden des Abziehlineals verbunden, wodurch die Höhe der Schneidenkante des Abziehlineals relativ zu den Führungshilfen eingestellt werden kann. Ein Verlegen von Führungshilfen auf Tennisplätzen, um diese bahnweise abziehen zu können, bedeutet einen sehr hohen Aufwand an Material und Zeit.In the DE 36 11 323 A1 a pulling device is specified which has a pulling ruler which is arranged between two support devices and attached to these in a height-adjustable manner. At the rear end of each of the two support devices is a roller by means of which the device is on two rulers or other guide aids such as a curb can be moved. In order to prevent the arrangement from tipping over, each of the support devices furthermore has a forwardly projecting scanning edge designed to be supported on the respective guide aid. Each of the support devices is also connected via a vertical spindle drive to one of the lateral ends of the leveling rule, whereby the height of the cutting edge of the leveling rule can be adjusted relative to the guide aids. Laying guide aids on tennis courts in order to be able to pull them off in lengths means a very high expenditure of material and time.

Es besteht daher ein Bedürfnis an einer Vorrichtung zum Abziehen der Verschleißschicht einer Tennisplatzdecke, die sich leicht bedienen lässt, nur die Verschleißschicht, diese aber vollständig abzieht und effektiver in der Handhabung ist.There is therefore a need for a device for peeling off the wearing course of a tennis court cover which is easy to operate, only the wearing course, but which is completely peeling off and which is more effective in handling.

Diese Aufgabe wird erfindungsgemäß durch eine Abziehvorrichtung, welche die im Patentanspruch 1 angeführten Merkmale aufweist, gelöst.This object is achieved according to the invention by a pulling device which has the features set out in claim 1.

Vorzugsweise schließt eine, die erste Kante des Schaberblatts berührende Tangente an die Umfangslinie der Rollvorrichtung mit dem Schaberblatt im Bereich der ersten Kante einen Winkel im Bereich von 20 bis 70 Grad, insbesondere im Bereich von 30 bis 60 Grad und bei besonders bevorzugten Ausführungsformen im Bereich von 40 bis 50 Grad ein. Bei bestimmungsgemäßen Gebrauch der Vorrichtung entspricht die Tangente der Oberfläche der Tennisplatzdecke. Bei einer für den Einsatzzweck besonders geeigneten Ausführungsform beträgt der Winkel zwischen der Rückseite des Schaberblatts im Bereich der ersten Kante und der Tangente 45 Grad. Hierdurch wird nicht nur der zum Abtragen einer Verschleißschicht erforderliche Kraftaufwand geringgehalten, sondern auch die Wahrscheinlichkeit reduziert, dass sich das Schaberblatt während des Abziehens in den Boden eingräbt oder vom Boden abhebt.Preferably, a tangent to the circumference of the rolling device, touching the first edge of the scraper blade, closes with the scraper blade in the area of the first edge an angle in the range from 20 to 70 degrees, in particular in the range from 30 to 60 degrees and in particularly preferred embodiments in the range of 40 to 50 degrees. When the device is used as intended, the tangent corresponds to the surface of the tennis court ceiling. In an embodiment particularly suitable for the intended use, the angle between the back of the scraper blade in the area of the first edge and the tangent is 45 degrees. This not only keeps the effort required to remove a wearing layer low, but also reduces the likelihood that the scraper blade will dig into the ground or lift off the ground during removal.

Die im Einsatz auf dem Boden aufliegende erste Kante wird im Folgenden als Bodenkante, die sich im Einsatz oberhalb des Bodens befindende zweite Kante als Oberkante bezeichnet. Die Oberkante kann, muss aber nicht parallel zur Bodenkante verlaufen. Sie kann zum Beispiel Segmente aufweisen, die unter einem Winkel zueinander angeordnet sind, oder gekrümmt sein, beispielsweise um die Steifigkeit des Schaberblatts zu verbessern. Die Bodenkante ist dagegen stets gerade und so ausgerichtet, dass sie, wenn die Vorrichtung auf dem Boden abgelegt ist, über ihre gesamte Länge auf dem Boden aufliegt. Bei einer bevorzugten Ausführungsform ist die Oberkante parallel zur Bodenkante ausgebildet und weist eine oder mehrere Biegungen in Richtung zur Vorderseite des Schaberblatts auf.The first edge resting on the floor during use is referred to below as the floor edge, and the second edge located above the floor during use is referred to as the top edge. The top edge can, but does not have to, run parallel to the bottom edge. For example, it can have segments which are arranged at an angle to one another, or can be curved, for example in order to improve the rigidity of the scraper blade. The bottom edge, on the other hand, is always straight and aligned so that when the device is placed on the ground, it is over its rests on the floor over the entire length. In a preferred embodiment, the top edge is formed parallel to the bottom edge and has one or more bends in the direction of the front of the scraper blade.

Um einen gleichmäßigen Abtrag zu ermöglichen, sind die beiden Endbereiche des Stiels in einem Winkel zueinander ausgebildet, wobei der an dem Schaberblatt angebrachte Endbereich des Stiels vorzugsweise parallel zur oben bezeichneten Tangente ausgerichtet ist und der andere Endbereich des Stiels vom Schaberblatt weg nach oben, d. h. weg von der Tangente, weist. Die Verbindung zwischen den beiden Endbereichen kann starr, einstellbar starr oder gelenkig sein. Eine gelenkige Verbindung erleichtert die Handhabung, da von einem Benutzer auf den Stiel ausgeübte vertikale Kräfte nicht an das Schaberblatt übertragen werden. Bei einigen Ausführungsformen ist zumindest ein Segment der Verbindung in seiner Länge verstellbar. Vorteilhaft reicht der am Schaberblatt angebrachte Endbereich des Stiels über die Bodenkante hinaus, wodurch ein gleichmäßiges Ziehen der Vorrichtung ohne Veränderung der Auflagekraft erleichtert wird. Am nicht mit dem Schaberblatt verbundenen Ende dieses Endbereichs kann eine Aufnahme ausgebildet sein, die z. B. das Anbringen von Gewichten zur Einstellung der Auflagekraft der Bodenkante ermöglicht. Hierdurch kann die Auflagekraft an die Beschaffenheit der abzutragenden Verschleißschicht angepasst werden, ohne die Bedienperson dadurch zu belasten. Am freien Stielende ist bei Ausführungsformen ein Griff angebracht, der die Handhabung erleichtert. Bei bevorzugten Ausführungsformen umfasst der Griff einen Querstiel, wodurch ein Ziehen der Vorrichtung erleichtert wird. An den Enden des Querstiels können zudem Griffapplikationen angebracht werden, die ein ergonomischeres Greifen ermöglichen.In order to enable even removal, the two end areas of the handle are formed at an angle to one another, the end area of the handle attached to the scraper blade preferably being aligned parallel to the tangent indicated above and the other end area of the handle facing upwards away from the scraper blade, i.e. H. away from the tangent, points. The connection between the two end regions can be rigid, adjustable, rigid or articulated. An articulated connection facilitates handling because vertical forces exerted on the handle by a user are not transmitted to the scraper blade. In some embodiments, at least a segment of the connection is adjustable in length. The end region of the handle attached to the scraper blade advantageously extends beyond the bottom edge, as a result of which the device can be pulled evenly without changing the contact force. At the end of this end region not connected to the scraper blade, a receptacle can be formed which, for. B. allows the attachment of weights to adjust the bearing force of the bottom edge. As a result, the contact force can be adapted to the nature of the wear layer to be removed without burdening the operator. In embodiments, a handle is attached to the free end of the handle, which facilitates handling. In preferred embodiments, the handle comprises a transverse handle, which makes it easier to pull the device. In addition, handle applications can be attached to the ends of the crossbar, which enable more ergonomic gripping.

Bevorzugte Ausführungsformen weisen eine verstärkte Bodenkante auf, um einem Verbiegen der Bodenkante im Einsatz und einem frühzeitigen Verschleiß der Bodenkante entgegenzuwirken. Vorteilhaft ist das Schaberblatt hierzu zweiteilig aufgebaut, einem Schaberblattschild und einem an der Unterkante des Schaberblattschildes angebrachten Bodenmesser. Das Bodenmesser kann an die Unterkante des Schildes anschließend oder über die Unterkante hinausstehend angeordnet sein. Der Winkel zwischen der am Boden aufliegenden Bodenkante des Bodenmessers und dem Schaberblatt im Bereich der ersten Kante entspricht vorzugsweise der Neigung dieses Bereichs des Schaberblattschildes gegenüber der Tangente, sodass die Bodenkante bei Gebrauch parallel zur Oberfläche der Tennisplatzdecke orientiert ist. Bei bevorzugten Ausführungsformen ist das Bodenmesser lösbar am Schaberblattschild angebracht, um einen Ersatz bzw. ein Nachschleifen eines abgenutzten Bodenmessers zu ermöglichen.Preferred embodiments have a reinforced base edge in order to counteract bending of the base edge during use and premature wear of the base edge. For this purpose, the scraper blade is advantageously constructed in two parts, a scraper blade shield and a floor knife attached to the lower edge of the scraper blade shield. The floor knife can be arranged adjacent to the lower edge of the shield or protruding beyond the lower edge. The angle between the bottom edge of the bottom knife resting on the ground and the scraper blade in the area of the first edge preferably corresponds to the inclination of this area of the scraper blade shield with respect to the Tangent, so that the bottom edge is oriented parallel to the surface of the tennis court ceiling when in use. In preferred embodiments, the floor knife is detachably attached to the scraper blade in order to enable a worn floor knife to be replaced or regrinded.

Im Folgenden werden Ausführungsformen einer wie oben dargelegten Abziehvorrichtung für Tennisplatzdecken anhand von Figuren näher erläutert, von denen

Figur 1
eine Abziehvorrichtung gemäß einer ersten Ausführungsform in einer Seitenansicht, und
Figur 2
die Abziehvorrichtung von Figur 1 ohne Stiel in einer Draufsicht zeigt.
In the following, embodiments of a pulling device for tennis court ceilings as set out above are explained in more detail with reference to figures, of which
Figure 1
a puller device according to a first embodiment in a side view, and
Figure 2
the puller of Figure 1 shows without stem in a plan view.

Figur 1 zeigt eine auch Schaber genannte Abziehvorrichtung 1 für Tennisplatzdecken gemäß einer ersten Ausführungsform. Die Abziehvorrichtung umfasst ein Schaberblatt 10, das ein Schaberblattschild 11 und ein daran befestigtes Bodenmesser 12 aufweist. An der Rückseite des Schaberblattschildes 11 ist ein Gestell 20 angebracht, das das Schaberblatt 10 mit einer zwei Räder 31 und 32 umfassenden Rollvorrichtung 30 verbindet. Die Achsen der beiden Räder 31 und 32 liegen innerhalb üblicher Toleranzen auf derselben Linie. Das Gestell 20 ermöglicht ein Schwenken des Schaberblattschildes 11 um die Radachsen. Figure 1 shows a stripping device 1 for tennis court covers, also called a scraper, according to a first embodiment. The pulling device comprises a scraper blade 10, which has a scraper blade shield 11 and a floor knife 12 attached thereto. A frame 20 is attached to the rear of the scraper blade shield 11 and connects the scraper blade 10 to a rolling device 30 comprising two wheels 31 and 32. The axes of the two wheels 31 and 32 lie on the same line within the usual tolerances. The frame 20 enables the scraper blade shield 11 to pivot about the wheel axles.

Bei der dargestellten Ausführungsform ist der Hauptteil des Schaberblattschildes 11 eben ausgebildet und endet an der zum abzuziehenden Boden weisenden Seite in einer parallel zu den Achsen der beiden Räder 31 und 32 verlaufenden Unterkante 15. Die der Unterkante gegenüber liegende Oberkante 16 des Schaberblattschildes 11 verläuft ebenfalls parallel zu den Radachsen, ist im Gegensatz zur Unterkante jedoch profiliert ausgeführt, um die Steifigkeit des Schildes 11 zu verbessern. Im dargestellten Beispiel entsteht das Profil durch zweimaliges Biegen des Schildes in Richtung zu dessen Vorderseite, das ist die den Rädern 31 und 32 abgewandte Seite des Schaberblattschildes 11. Durch die wie insbesondere aus Figur 1 ersichtliche zweifach nach vorne umgebogene Oberkante 16 wird das Schaberblattschild 11 wesentlich verwindungssteifer, wobei eine derart ausgeführte Oberkante 16 zudem verhindert, dass abgeschabter Sand über die Oberkante wieder zurück auf die bereits abgeschabte oberste Bodenschicht fällt.In the embodiment shown, the main part of the scraper blade shield 11 is flat and ends on the side facing the soil to be removed in a lower edge 15 running parallel to the axes of the two wheels 31 and 32. The upper edge 16 of the scraper blade shield 11 opposite the lower edge also runs parallel to the wheel axles, but in contrast to the lower edge it is profiled in order to improve the rigidity of the shield 11. In the example shown, the profile is created by bending the shield twice in the direction of its front side, that is the side of the scraper blade shield 11 facing away from the wheels 31 and 32 Figure 1 The top edge 16, which can be seen twice forwards bent over, makes the scraper blade shield 11 significantly more torsion-resistant, an upper edge 16 designed in this way also preventing that scraped sand falls over the upper edge back onto the top layer of soil that has already been scraped off.

An der Unterseite des Schaberblattschildes 11 ist ein Bodenmesser 12 lösbar, beispielsweise mithilfe von Schrauben, angebracht. Bei anderen Ausführungsformen kann das Bodenmesser 12 auch fest angebracht sein, beispielsweise durch Kleben oder Schweißen. In der gezeigten Ausführungsform ist das Bodenmesser 12 an der Vorderseite des Schaberblattschildes 11 befestigt. Dadurch wird das Bodenmesser beim Abtragen einer Verschleißschicht gegen das Schaberblattschild 11 gedrückt und von diesem gestützt. Bei anderen Ausführungsformen kann das Bodenmesser 12 auch an der Rückseite des Schaberblattschildes 11 befestigt sein. In diesen Fällen wird das Bodenmesser 12 beim Abtrag einer Deckschicht allerdings vom Schaberblattschild 11 weggedrückt, sodass eine entsprechend solide Ausführung der Befestigung erforderlich ist. In der dargestellten ersten Ausführungsform ragt die Unterkante 17 des Bodenmessers 12 über die Unterkante des Schaberblattschildes 11 hinaus. Die als Schabkante fungierende Unterkante des Bodenmessers 12 wird im Folgenden Bodenkante 17 des Schaberblatts 10 genannt.A floor knife 12 is detachably attached to the underside of the scraper blade shield 11, for example with the aid of screws. In other embodiments, the floor knife 12 can also be firmly attached, for example by gluing or welding. In the embodiment shown, the floor knife 12 is attached to the front of the scraper blade shield 11. As a result, when a wear layer is removed, the floor knife is pressed against the scraper blade shield 11 and supported by it. In other embodiments, the bottom knife 12 can also be attached to the rear of the scraper blade shield 11. In these cases, however, the floor knife 12 is pushed away from the scraper blade shield 11 when a cover layer is removed, so that a correspondingly solid design of the fastening is required. In the first embodiment shown, the lower edge 17 of the floor knife 12 protrudes beyond the lower edge of the scraper blade 11. The lower edge of the bottom knife 12 functioning as a scraping edge is called bottom edge 17 of the scraper blade 10 in the following.

Bei der gezeigten ersten Ausführungsform einer Abziehvorrichtung 1 verläuft die über das Gestell 20 realisierte Verbindung zwischen der Abrollvorrichtung 30 und dem Schaberblatt 10 horizontal zur Bodenoberfläche 2, auf der die Vorrichtung 1 in der in Figur 1 dargestellten einsatzbereiten Stellung aufliegt. Die mittlere Länge der radialen Verbindung von der Achse der Rollvorrichtung (Radachsen) zur Rückseite des Schaberblatts 10 wird Schwenkradius r genannt. Das Schaberblatt 10 ist gegenüber dem Schwenkradius r geneigt, wobei der Winkel α' zwischen Schaberblatt 10 und Schwenkradius r kleiner als 90 Grad und größer als 0 Grad ist, sodass der Abstand zwischen den Achsen der beiden, die Rollvorrichtung 30 bildenden, Rädern 31 und 32 zur Bodenkante 17 größer ist als der Abstand zur Oberkante 16 des Schaberblatts 10.In the shown first embodiment of a pulling device 1, the connection between the rolling device 30 and the scraper blade 10 implemented via the frame 20 runs horizontally to the floor surface 2 on which the device 1 in the FIG Figure 1 ready for use position shown. The mean length of the radial connection from the axis of the rolling device (wheel axles) to the rear of the scraper blade 10 is called the pivot radius r. The scraper blade 10 is inclined with respect to the pivot radius r, the angle α 'between the scraper blade 10 and the pivot radius r being smaller than 90 degrees and greater than 0 degrees, so that the distance between the axes of the two wheels 31 and 32 forming the rolling device 30 to the bottom edge 17 is greater than the distance to the top edge 16 of the scraper blade 10.

Bei geradem Schaberblatt entspricht der Winkel α' zwischen Schaberblatt 10 and Schwenkradius r dem Winkel α zwischen dem Schaberblatt und dem Boden, auf dem die Abziehvorrichtung ruht. Verläuft der durch das Gestell 20 bestimmte Schwenkradius r nicht wie in der in Figur 1 veranschaulichten ersten Ausführungsform parallel zu der Tangente an die Rollvorrichtung 30, die die Bodenkante berührt, dann sind α' und a verschieden. Ist α' größer als a, ist der Auflagedruck der Bodenkante größer, ist α' kleiner als a, ist der Auflagedruck der Bodenkante kleiner als bei der ersten Ausführungsform. Der Winkel α' bietet daher die Möglichkeit die gewünschte Auflagekraft der Bodenkante auch bei unterschiedlich schweren Schaberblättern zu erzielen. Bei einigen Ausgestaltungen der Vorrichtung 1 ist die Verbindung daher so ausgebildet, dass der Winkel α' verstellt werden kann.With a straight scraper blade, the angle α 'between the scraper blade 10 and the pivot radius r corresponds to the angle α between the scraper blade and the floor on which the puller rests. If the pivot radius r determined by the frame 20 does not run as in FIG Figure 1 illustrated first embodiment parallel to the tangent to the rolling device 30 which touches the bottom edge, then α 'and a are different. If α 'is greater than a, the contact pressure of the bottom edge is greater, if α' is less than a, the contact pressure is the Bottom edge smaller than in the first embodiment. The angle α 'therefore offers the possibility of achieving the desired bearing force of the bottom edge even with scraper blades of different weights. In some configurations of the device 1, the connection is therefore designed in such a way that the angle α 'can be adjusted.

Bei der in den Figuren dargestellten bevorzugten ersten Ausführungsform weist das Gestell 20 die Form eines Ms auf, dessen Schenkel und V-Spitze mit einer L-Profilleiste verbunden sind, die ihrerseits mit der Rückseite des Schaberblattschildes 11, in etwa in halber Höhe, verbunden ist. Die Verbindung der einzelnen Komponenten des Gestells 20 untereinander und des Gestells 20 mit dem Schaberblattschild 11 erfolgt vorzugsweise durch Schweißen. Die Räder 31 und 32 sind an den Schenkeln des M-förmigen Gestells 20 angebracht, vorzugsweise in Höhe der Verbindung zu dem von den Schenkeln eingeschlossenen V-förmigen Teil des Gestells 20. Die Räder 31 und 32 sind vorzugsweise mit breiter Bereifung ausgestattet, damit sie keine Spuren im durch den Abtrag freigelegten Boden hinterlassen. Der Abstand der Außenseiten der Räder 31 und 32 zueinander ist vorzugsweise kleiner als die Breite des Schaberblatts 10, d. h. dessen Ausdehnung parallel zur Achslinie der Rollvorrichtung 30.In the preferred first embodiment shown in the figures, the frame 20 has the shape of an Ms, the legs and V-tip of which are connected to an L-profile strip, which in turn is connected to the back of the scraper blade shield 11 at approximately half the height . The connection of the individual components of the frame 20 to one another and of the frame 20 to the scraper blade shield 11 is preferably carried out by welding. The wheels 31 and 32 are attached to the legs of the M-shaped frame 20, preferably at the level of the connection to the V-shaped part of the frame 20 enclosed by the legs. The wheels 31 and 32 are preferably equipped with wide tires so that they leave no traces in the soil exposed by the erosion. The spacing of the outer sides of the wheels 31 and 32 from one another is preferably less than the width of the scraper blade 10, i. H. its extent parallel to the axis line of the rolling device 30.

Nahe zur Oberkante des Schaberblattschildes 11 ist bezüglich der Breite des Schildes 11 mittig eine Aufnahme 13 zur Befestigung eines Stiels 40 angebracht. Statt einer mittigen Aufnahme kann auch eine andere Aufnahmekonfiguration gewählt werden, beispielsweise eine Zweifachaufnahme für einen gegabelten Stiel. Wichtig ist jedoch, dass der Kraftansatz mittig zum Schild 11 verläuft, sodass auf den Schild keine Drehkräfte in horizontaler Richtung ausgeübt werden. Die Aufnahme 13 ist so ausgebildet, dass der in sie eingesetzte Endbereich 41 parallel zur oben beschriebenen Tangente, d. h. im bestimmungsgemäßen Gebrauch parallel zur Oberfläche der Tennisplatzdecke ausgerichtet ist. In der in den Figuren gezeigten Ausführungsform weist die Aufnahme einen Sicherungsstift 14 auf, der durch die Aufnahme und den darin eingesetzten Stiel geführt wird, um Stiel und Schaberblatt 10 lösbar miteinander zu verbinden. Aufnahme 13 und Sicherungsstift 14 bilden ein Stecksystem mit formschlüssiger Sicherung aus, das eine einfache Montage des Stiels 40 an der rollengestützten Schabereinheit ermöglicht. Außer dem Endbereich 41 weist der Stiel 40 ein weiteres Segment 42 auf, das über einen offenen Vierkant 43 mit dem Endbereich 41 starr so verbunden ist, dass das Segment 41 und das Segment 42 einen Winkel β einschließen, der vorzugsweise gleich 90° + α oder etwas kleiner ist. Bei dem für die erste Ausführungsform besonders bevorzugten Winkel α zwischen Schaberblatt und von der Bodenkante an den Radumfang geführten Tangente von 45° beträgt der Winkel β zwischen den beiden Segmenten 41 und 42 des Stiels 40 etwa 135° und bevorzugter 130°. Die Länge des ersten Segments 41, reicht vorzugsweise über die Bodenkante 17 hinaus, so dass der Auflagedruck der Bodenkante 17 über ein an dem Vierkant befestigtes Gewicht in einfacher Weise erhöht werden kann. Die über die Aufnahme 13 realisierte starre Verbindung des Stiels 40 mit dem Schaberblatt 10 verhindert dabei eine Übertragung der Gewichtskraft auf den Griffteil 44 des Stiels. Die beiden Segmente des Stiels können bei anderen Ausführungsformen auch ohne dazwischen angeordneten Vierkant 43 verbunden sein. Außerdem kann der Stiel 40 zwischen seinen beiden Endbereichen 41 und 42 gekrümmt ausgeführt sein, um den oben beschriebenen Winkel zwischen den beiden Endbereichen auszubilden. Zur leichteren Handhabung ist bei der ersten Ausführungsform an dem nicht am Schaberblatt 10 angebrachten Ende des Stiels 10 ein Querstiel 44 angebracht, an dessen Enden vorzugsweise Griffapplikationen befestigt sind, die den durch das Ziehen der Vorrichtung 1 auf die Handflächen einer Bedienperson ausgeübten Druck verringern.Near the upper edge of the scraper blade shield 11, a receptacle 13 for fastening a handle 40 is attached in the middle with respect to the width of the shield 11. Instead of a central receptacle, another receptacle configuration can also be selected, for example a double receptacle for a forked handle. It is important, however, that the application of force runs centrally to the shield 11 so that no torsional forces are exerted on the shield in the horizontal direction. The receptacle 13 is designed in such a way that the end region 41 inserted into it is aligned parallel to the tangent described above, ie when used as intended, parallel to the surface of the tennis court ceiling. In the embodiment shown in the figures, the receptacle has a locking pin 14 which is guided through the receptacle and the handle inserted therein in order to releasably connect the handle and scraper blade 10 to one another. The receptacle 13 and the securing pin 14 form a plug-in system with a form-fitting securing which enables the handle 40 to be easily mounted on the roller-supported scraper unit. In addition to the end area 41, the stem 40 has a further segment 42 which is rigidly connected to the end area 41 via an open square 43 such that the segment 41 and the segment 42 enclose an angle β which is preferably equal to 90 ° + α or is a little smaller. In which For the first embodiment particularly preferred angle α between the scraper blade and the tangent of 45 ° guided from the bottom edge to the wheel circumference, the angle β between the two segments 41 and 42 of the handle 40 is approximately 135 ° and more preferably 130 °. The length of the first segment 41 preferably extends beyond the bottom edge 17, so that the contact pressure of the bottom edge 17 can be increased in a simple manner by means of a weight attached to the square. The rigid connection of the handle 40 to the scraper blade 10 via the receptacle 13 prevents the weight force from being transmitted to the handle part 44 of the handle. In other embodiments, the two segments of the stem can also be connected without a square 43 arranged in between. In addition, the handle 40 can be curved between its two end regions 41 and 42 in order to form the angle described above between the two end regions. For easier handling, in the first embodiment, a transverse handle 44 is attached to the end of the handle 10 that is not attached to the scraper blade 10, at the ends of which handle applications are preferably attached, which reduce the pressure exerted by pulling the device 1 on the palms of an operator.

Die als Bodenkante 17 des Schaberblatts 10 fungierende Unterseite des Bodenmessers 12 schließt mit der Vorderseite des Bodenmessers 12 einen Winkel ein, der innerhalb üblicher Fertigungstoleranzen dem Winkel α zwischen dem Schaberblatt und der von der Bodenkante an den Radumfang geführten Tangente entspricht. Bei anderen Ausführungsformen kann der Winkel auch etwas kleiner als α sein.The underside of the floor knife 12, which acts as the bottom edge 17 of the scraper blade 10, forms an angle with the front of the floor knife 12 which, within customary manufacturing tolerances, corresponds to the angle α between the scraper blade and the tangent from the bottom edge to the wheel circumference. In other embodiments, the angle can also be slightly smaller than α.

Nachfolgend werden Maße und Materialien von Komponenten von besonderen Ausgestaltungen der ersten Ausführungsform angegeben, die sich für den Einsatz bei einer Tennisplatzinstandsetzung als besonders effektiv erwiesen haben. Diese können bei einer speziellen Ausgestaltung einzeln oder in Kombination verwirklicht sein.The dimensions and materials of components of particular configurations of the first embodiment which have proven to be particularly effective for use in tennis court repairs are given below. In a special configuration, these can be implemented individually or in combination.

Schaberblattschild 11: Breite 1350 mm, Höhe von Unterkante bis erste Biegung (45°) der Oberkante 240 mm, Abstand zwischen erster und zweiter Biegung (90°) der Oberkante 30 mm, Überstand nach zweiter Biegung der Oberkante 25 mm, Stahlblech; Bodenmesser: Breite 1350 mm, Höhe 40 mm, Stärke 10 mm, Stahl, über 5 Schrauben an der Vorderseite des Schaberblattschilds befestigt;Scraper blade shield 11: width 1350 mm, height from lower edge to first bend (45 °) of upper edge 240 mm, distance between first and second bend (90 °) of upper edge 30 mm, overhang after second bend of upper edge 25 mm, sheet steel; Floor knife: width 1350 mm, height 40 mm, thickness 10 mm, steel, attached to the front of the scraper blade with 5 screws;

Stielaufnahme am Schaberblattschild 11: Vierkantstahl, Innenabmessung 40,5 x 40,5 mm.Handle holder on scraper blade 11: square steel, internal dimensions 40.5 x 40.5 mm.

Gestell 20: 2 Flacheisen 255 x 60 x 10 mm seitlich an Flachstahlwinkel 60 x 60 x 1095 mm geschweißt, 45° Abstützung beider Seiten zum Flachstahlwinkel mit Vierkantstahl, an Flacheisen in Höhe der Abstützung angebrachte Bolzen dienen als Radachsen;
An Schaberblattschild angebrachtes Segment 41 des Stiels 40: Vierkanteisen mit Außenabmessung 40 x 40 mm, Länge 310 mm;
An Schaberblattschild angebrachtes Segment 42 des Stiels 40: Stahlrohr, Länge 1100 mm;
Vierkant 43 zwischen den beiden Segmenten: Stahlrohr mit Innenmaß 41 x 41 mm; Winkel β zwischen den beiden Segmenten des Stiels: 130 Grad;
Winkel α zwischen dem Schaberblatt und der von der Bodenkante an den Radumfang geführten Tangente: 45 Grad;
Winkel α' zwischen Schaberblatt10 im Bereich der Bodenkante und Schwenkradius r: 45 Grad.
Räder: Kunststofffelgen mit Gummibereifung.Frame 20: 2 flat iron 255 x 60 x 10 mm laterally welded to flat steel angle 60 x 60 x 1095 mm, 45 ° support on both sides to the flat steel angle with square steel, bolts attached to flat iron at the height of the support serve as wheel axles;
Segment 41 of the handle 40 attached to the scraper blade shield: square iron with external dimensions 40 x 40 mm, length 310 mm;
Segment 42 of handle 40 attached to the scraper blade shield: steel tube, length 1100 mm;
Square 43 between the two segments: steel tube with internal dimensions 41 x 41 mm; Angle β between the two segments of the stem: 130 degrees;
Angle α between the scraper blade and the tangent guided from the bottom edge to the wheel circumference: 45 degrees;
Angle α 'between scraper blade 10 in the area of the bottom edge and pivot radius r: 45 degrees.
Wheels: plastic rims with rubber tires.

Da die Bodenkante 17 des Schaberblatts 10 senkrecht zur Ziehrichtung der Abziehvorrichtung 1 angeordnet ist, wird das abgetragene Material vor dem Schaberblatt mitgeführt und nicht wie beim oben genannten Stand der Technik über eine Seite des Schaberblatts abgeführt um als Abraumlinie seitlich der Abzugsfläche abgelegt zu werden. Dadurch entfällt mit der Abziehvorrichtung 1 die im Stand der Technik nach dem Abziehen erforderliche Nachbearbeitung der Tennisplatzoberfläche. Darüber hinaus wird aber auch eine gleichmäßigere und ebenere Oberfläche erzielt. Insgesamt ist der zum Abziehen erforderliche Kraftaufwand geringer, so dass einerseits mehr Fläche pro Zeit abgeschabt werden kann, die Vorrichtung über die Beseitigung der Verschleißschicht hinaus aber auch zur Deckenreduzierung eingesetzt werden kann. Diese erfolgt üblicherweise in mehreren Durchgängen, bei denen die Abziehvorrichtung 1 mehrmals über die jeweiligen Oberflächen der Tennisplatzdeckschicht gezogen wird.Since the bottom edge 17 of the scraper blade 10 is arranged perpendicular to the pulling direction of the pulling device 1, the removed material is carried along in front of the scraper blade and not, as in the above-mentioned prior art, discharged via one side of the scraper blade to be deposited as a debris line to the side of the pull-off surface. As a result, with the puller 1, the post-processing of the tennis court surface that is required in the prior art after pulling is no longer necessary. In addition, a more even and even surface is achieved. Overall, the force required for pulling off is lower, so that on the one hand more area can be scraped off per time, but the device can also be used to reduce the ceiling in addition to removing the wearing layer. This usually takes place in several passes, in which the pulling device 1 is pulled several times over the respective surfaces of the tennis court cover layer.

Aufgrund der Tatsache, dass der zur Bedienung der Abziehvorrichtung 1 erforderliche Krafteinsatz geringer als im Stand der Technik ist und die Ausbildung und Anordnung der Bodenkante einen gleichmäßigen Abzug der Verschleißschicht ohne weitere Maßnahmen garantiert, können bei normaler bis bodenfeuchter Verschleißschicht am Tag mehr als 10 Tennisplätze instand gesetzt werden. Auch bei sehr feuchten Tennisplätzen, d. h. unmittelbar nach dem Auftauen eines Tennisplatzes, können immerhin noch mehr als 5 Tennisplätze am Tag instand gesetzt werden. Die oben beschriebene Abziehvorrichtung 1 ist somit nicht nur wesentlich effektiver als die im Stand der Technik bekannten Vorrichtungen, sie ermöglicht darüber hinaus auch eine Frühjahrsinstandsetzung von Tennisplätzen zu einem frühest möglichen Zeitpunkt.Due to the fact that the force required to operate the pulling device 1 is less than in the prior art and the design and arrangement of the bottom edge allow the wear layer to be removed evenly Guaranteed without further measures, more than 10 tennis courts can be repaired per day if the wearing course is normal or damp. Even with very damp tennis courts, ie immediately after a tennis court has thawed, more than 5 tennis courts can still be repaired a day. The pulling device 1 described above is therefore not only significantly more effective than the devices known in the prior art, it also enables tennis courts to be repaired in spring at the earliest possible point in time.

Claims (10)

  1. Scraper device (1) for tennis court surfaces comprising:
    a doctor blade (10),
    a rolling device (30), and
    a handle (40),
    wherein
    the doctor blade (10) is connected to the rolling device (30) arranged at a distance from the back of the doctor blade and is pivotable around the rolling device,
    the doctor blade has a first edge which is straight and aligned in parallel to the one or more axes of the rolling device (30),
    the angle between the back of the doctor blade (10) in the area of the first edge (17) and a tangent (2) to the circumferential line of the rolling device (30) touching the first edge (17) of the doctor blade (10) is less than 90 degrees and greater than 0 degrees, so that the distance between the or each of the axes (35) of the rolling device (30) and the first edge (17) is greater than the distance between the or each of the axes of the rolling device and a second edge (16) of the doctor blade (10) opposite the first edge, and
    the handle (40) is mounted on the side of the doctor blade facing away from the rolling device and close to the second edge (16), with the point of application of force symmetrical to its centre.
  2. Device (1) according to claim 1, wherein
    the angle between the doctor blade (10) in the area of the first edge (17) and the tangent (2) touching the first edge (17) of the doctor blade is in the range of 20 to 70 degrees, in particular in the range of 30 to 60 degrees and in particularly preferred embodiments in the range of 40 to 50 degrees.
  3. Device (1) according to claim 2, wherein
    the angle between the back of the doctor blade (10) and the tangent (2) to the circumferential line of the rolling device (30) is 45 degrees.
  4. Device (1) according to claim 1, 2 or 3, wherein
    the second edge (16) is provided in parallel to the first edge (17) and optionally has one or more bends towards the front of the doctor blade (10).
  5. Device (1) according to any one of claims 1 to 4, wherein the doctor blade (10) comprises a doctor blade plate (11) and a ground knife (12) detachably attached to the front of the doctor blade plate (11) such that it extends beyond the lower edge (15) of the doctor blade plate (11) opposite the upper edge of the doctor blade (10) and forms the first edge (17) of the doctor blade (10).
  6. Device (1) according to any one of claims 1 to 5, wherein the handle (40) comprises a first end portion (41) at one of its ends and a second end portion (42) at the other of its ends, and the doctor blade (10) further comprises a socket (13) provided centred and close to the second edge (16) and adapted to receive the first end portion (41) such that the first end portion (41) is aligned in parallel to the tangent (2).
  7. Device (1) according to claim 6, wherein the first end portion (41) and the second end portion (42) of the handle are arranged at an angle to each other being equal to or smaller than the sum of 90 degrees and the angle (a) between the back of the doctor blade (10) in the area of the first edge (17) and the tangent (2).
  8. Device (1) according to claim 7, wherein at the connection between the first end portion (41) and the second end portion (42) of the handle there is arranged a socket (43) adjoining the first end region (41) and being configured to receive one or more weights.
  9. Device (1) according to any one of claims 6 to 8, wherein the first end portion (41) extends beyond the first edge (17) of the doctor blade (10) when attached to the socket (13).
  10. Device (1) according to any one of the preceding claims, wherein the rolling device (30) comprises two wheels (31, 32) whose axles lie on a line and wherein the first edge (17) extends on both sides of the doctor blade (10) beyond the outer sides of the wheels (31, 32).
EP19167128.8A 2018-04-11 2019-04-03 Extractor tool for maintenance of tennis court Active EP3553227B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018108649.0A DE102018108649A1 (en) 2018-04-11 2018-04-11 Scraper for tennis court repair

Publications (2)

Publication Number Publication Date
EP3553227A1 EP3553227A1 (en) 2019-10-16
EP3553227B1 true EP3553227B1 (en) 2021-01-06

Family

ID=66092093

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19167128.8A Active EP3553227B1 (en) 2018-04-11 2019-04-03 Extractor tool for maintenance of tennis court

Country Status (3)

Country Link
EP (1) EP3553227B1 (en)
DE (1) DE102018108649A1 (en)
ES (1) ES2865299T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111424511A (en) * 2020-04-29 2020-07-17 建德托程自动化设备有限公司 Brick dismounting device for road construction

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7111562U (en) * 1971-03-26 1971-07-08 Heidt G SCRAPER FOR MOBILE STREET CLEANING MACHINES
DE3611323A1 (en) * 1986-04-04 1987-10-08 Harald Kleinemas PULLING DEVICE FOR PRODUCING A FINE PLANUM
DE102005049331A1 (en) * 2004-10-12 2006-05-04 Grabmann & Eberl Gmbh Road-building device with scraper blade designed to work at an angle at or less than 90 degrees and to bring in material used to construct the road has a ground treatment device at its front end to take out material not used for the road

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
ES2865299T3 (en) 2021-10-15
DE102018108649A1 (en) 2019-10-17
EP3553227A1 (en) 2019-10-16

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