EP1430183B1 - Snow plow with blade, wear strip and device for fixing the wear strip to the blade - Google Patents

Abstract

The invention relates to a device for fixing a wear strip (7) to the blade of a snow plow. Said device comprises holding projections (3) which are arranged on the blade (1) and which engage in recesses (8) of the wear strip (7). In order to simplify the assembly and disassembly and to increase the reliability of the fixation, each holding projection (3) consists of a holding element (4) which is fixed to the blade and a locking element (5) which can be rotated in relation to the same. In the unlocked position, the locking element (5) and the holding element are (4) congruently superimposed in such a way that the wear strip (7) can be easily lifted and pushed. In the locked position, the locking element (5) is rotated in relation to the holding element (4) in such a way that the projections of the locking element (5) rest on the wear strip (7), from the outside, in such a way that the wear strip is positively fixed in all directions.

Description

The invention relates to a snow plow with a plow blade of a replaceable wear strip and a device for fastening the wear strip on the plow blade, arranged on the plow blade, in the direction of the wear strip projecting retaining projections which engage in recesses of the wear strip.

According to the state of the art ( DE 33 36 289 A1 ), it is customary to attach to the underside of the plow blade of a snow plow exchangeable wear strips, the z. As steel or a steel-rubber-steel sandwich with hard material deposits z. B. consist of corundum. The attachment is usually by means of screws that reach through the lower edge of the plow blade and the top of the wear strip. This type of fastening with screws has the disadvantage that the assembly and disassembly of the wear strip is relatively laborious, because first the relatively heavy wear strip sections must be brought into the correct position to then introduce the screws into the corresponding holes can.

Has also proven to be a prior art ( DE-AS-24 44 286 ) known attachment, in which at the plow blade fasteners z. B. are provided in the form of bolts, which engage in lateral notches on the individual sections of the wear strip, wherein on the underside of the dozer blade clamping claws are still provided which engage around the upper edge of the wear strip and clamp against the lower edge of the dozer blade. The latter attachment has the advantage of a special simple assembly and disassembly, but is expensive to build and has the disadvantage that the wear strip can be solved by the snow blade of the snow plow, if z. B. in hard shocks slip out of the clamping connection substantially frictionally held by the clamping claws sections of the wear strip. Wear strips that have been removed at an inopportune time can mean a considerable risk of accidents for subsequent traffic. Another disadvantage is that the clamping claws hinder the flow of dissolved snow in the direction of the plow blade at the top of the wear strip, so that unpredictably hochspritzt the snow on the clamping claws and dirty the windshield of the snow plow especially at high speed of the snow plow.

It is therefore an object of the invention to further develop the snow plow of the type mentioned in that on the one hand a quick assembly and disassembly of the wear strip is ensured and on the other hand it is ensured that the mounted wear strip does not dissolve at times of the plow blade. In addition, the flow of snow over the plow blade should be hindered as little as possible.

• daß jeder Haltevorsprung aus einem fest mit dem Räumschild verbundenen Halteteil und einem mit dem Halteteil verbundenen Verriegelungsteil besteht, welches um eine senkrecht zum Räumschild verlaufende Drehachse zwischen einer Entriegelungsstellung und einer Verriegelungsstellung verdrehbar ist,
• daß sowohl das Halteteil als auch das Verriegelungsteil in Bezug auf die Drehachse des Verriegelungsteils mit radialen Vor- und Rücksprüngen versehen sind, die in der Entriegelungsstellung des Verriegelungsteils senkrecht zum Räumschild gesehen miteinander fluchten,
• daß die Innenkonturen der Ausnehmungen in der Verschleißleiste den Außenkonturen der Halteteile und Verriegelungsteile in der Entriegelungsstellung entsprechen,
• und daß in der Verriegelungsstellung die Vorsprünge des Verriegelungsteils über den Rücksprüngen des Halteteils liegen und gegen die in den Rücksprüngen des Halteteils befindlichen Bereiche der Verschleißleiste drücken.

To solve this problem, the invention proposes starting from a snow plow of the type mentioned,

• in that each holding projection consists of a holding part fixedly connected to the plowing blade and a locking part connected to the holding part, which is rotatable about an axis of rotation perpendicular to the plow blade between an unlocking position and a locking position,
• that both the holding part and the locking part are provided with respect to the axis of rotation of the locking member with radial projections and recesses, which are perpendicular to the dozer blade in the unlocked position of the locking member aligned,
• that the inner contours of the recesses in the wear strip correspond to the outer contours of the holding parts and locking parts in the unlocked position,
• and that in the locking position, the projections of the locking part lie over the recesses of the holding part and press against the areas located in the recesses of the holding part of the wear strip.

The fastening device of the snowplough according to the invention has the advantage that the wear strip is positively fixed in locking devices located in the locking position on the one hand to the holding parts and on the other hand on the locking parts of all retaining projections in all directions, so that the wear strip are detached in any direction from the retaining projections can.

Furthermore, the assembly and disassembly is very easy. For assembly, only all the locking parts are rotated in the unlocked position, so that each locking member is aligned with the underlying holding part. Then the recesses of the wear strip are pushed onto the retaining projections so far that the wear strip is in a plane with the holding parts. Finally, all locking parts are rotated in the locked position. Dismantling takes place in reverse order.

The structural complexity of the fastening device of the snow plow according to the invention is very small and hardly goes beyond what is required for a simple screw fastening. Because of their compact design, the fastening device according to the invention obstructs the flow of snow on the wear strip and the adjoining dozer blade barely.

An expedient development of the invention provides that the possible pivot angle of the locking member is limited by the locking position and the unlocking position associated stops on the holding part. This ensures that the locking part only between the fixed defined locking position and the equally well-defined unlocking pivoted and can not be rotated arbitrarily.

To facilitate assembly and disassembly, the locking member is clamped by means of a running in the axis of rotation clamping screw against the holding part and the wear strip, between this clamping screw and the locking part a slip clutch is arranged, which entrains the locking member in the respective direction of rotation of the clamping screw upon rotation of the clamping screw until it abuts against the stop of the holding part associated with the locking position or the unlocking position.

This slip clutch expediently has a spring which is supported on the holding part and presses the locking part in the direction of the axis of rotation against the head of the clamping screw.

Through this slip clutch assembly is simplified insofar as needed for mounting after placing the wear strip on the retaining projections only the clamping screw, for example, with an impact wrench needs. The clamping screw takes over the slip clutch with the locking part, until it abuts in the locking position of the stop located there. Upon further actuation of the clamping screw slips through the slip clutch, so that the clamping screw can be tightened while the locking member remains in the locked position. When disassembling the tensioning screw is first also solved with an impact wrench until the locking member is so far released from the wear strip and the holding part under the action of the spring that it can rotate. Once it has come free accordingly, it is taken from the clamping screw on the slip clutch and rotated in the unlocked position, where it abuts the stop there located the holding part. The complete unscrewing of the clamping screw is prevented by a limit stop located at the end of the clamping screw. Once all the locking parts are in the unlocked position, the wear strip can be easily removed from the retaining projections.

Furthermore, it is provided that the locking member is secured in the locking position against rotation. This additionally ensures that existing in the locking position positive locking is not lost to the wrong time.

To facilitate the assembly is further provided that the outer contour of the locking member gradually widens in the direction of the plow blade until the outer contour of the holding part is reached. By this configuration of the retaining projection, the above-described pushing the wear strip on the individual holding projections is easier to accomplish. It is sufficient if the recesses in the wear strip are approximately hit by the retaining projections when attaching the wear strip. The more accurate alignment then takes place on further pushing the wear strip on the retaining projections by itself.

The holding part and the locking part can, for example, have the shape of a rectangle when viewed in the direction of the blade, the narrow sides of the rectangle representing the projections and the long sides of the rectangle representing the recesses with respect to the axis of rotation of the locking part.

In order to attach one and the same wear strip in case of need to the clearing blades of snow plows of different manufacturers, where the holding projections deviating distances from each other, is further provided that a larger number of recesses are provided as holding projections on the blade in the wear strip. In the attachment of such a wear strip remain in the concrete mounting case those recesses for which this concrete dozer blade has no holding projections.

In the event that the distances of the holders of Räumschilden different manufacturers overlap, can also be provided that the recesses in the wear strip in the longitudinal direction of the wear strip are widened so that this wear strip can be fixed to Räumschilden different snow plow manufacturers with different distances of the holding projections.

To ensure in the latter case that the wear strip remains positively connected in all conceivable directions of movement with the plow blade, it is provided that the widening of the recesses in the wear strip are dimensioned so that viewed in the longitudinal direction of the wear strip at each type of plow at least one retaining projection on the left and a retaining projection rests against the right recess recess of a recess.

In order to avoid that passing over the wear strip and the dozer blade passing snow through unused recesses, some or all recesses in the wear strip are closed by thin, vulcanized rubber hides. These rubber hides can be easily cut out by the operator of the snowploughs before the first use with the knife.

Instead of the shape of a rectangle, other shapes are possible for the retaining projections and recesses, for example the shape of a rhombus, the shape of an ellipse, the shape of a four-armed cross with arms rounded at the ends, the shape of an equilateral triangle or the shape of a double trapezoid , All of these geometric shapes have radial projections and radial recesses with respect to the central axis of rotation of the locking part and thus enable the above-described form-fitting support upon rotation of the locking member relative to the holding part in a non-aligned position. The degree of overlap in the locking position is dependent on the geometric configuration and can be optimally selected by an appropriate choice of the geometric configuration of the requirements.

Fig. 1:

Schematisch einen senkrechten Schnitt durch den Räumschild des Schneepfluges gemäß der Erfindung und die Befestigungsvorrichtung sowie die mittels dieser Befestigungsvorrichtung festgelegte Verschleißleiste;

Fig. 2:

schematisch eine Ansicht der Befestigungsvorrichtung in Richtung des Pfeiles A in Fig. 1;

Fig. 3:

in gleicher Darstellung wie Fig. 1 in abgewandelter Ausführung die Befestigungsvorrichtung;

Fig. 4 bis 9:

schematisch verschiedene geometrische Formen von Halteteil und Verriegelungsteil, jeweils in der Verriegelungsstellung;

Fig. 10:

eine Zusammenstellung von zwei Räumschilden mit unterschiedlichen Haltevorsprungsabständen, wobei diese beiden Räumschilde mit ein und derselben Verschleißleiste bestückt werden können, welche mehr Ausnehmungen hat, als jeder der beiden Räumschilde Haltevorsprünge aufweist;

Fig. 11:

eine Zusammenstellung von zwei Räumschilden mit unterschiedlichen Haltevorsprungsabständen, wobei hier die Verschleißleiste Ausnehmungen aufweist, die seitlich aufgeweitet sind, um mit beiden Räumschilden kompatibel zu sein.

Embodiments of the invention are explained below with reference to the drawings. Show it:

Fig. 1:

Schematically a vertical section through the plow blade of the snow plow according to the invention and the fastening device and the means this fastening device fixed wear strip;

Fig. 2:

schematically a view of the fastening device in the direction of arrow A in Fig. 1 ;

3:

in the same representation as Fig. 1 in a modified embodiment, the fastening device;

4 to 9:

schematically different geometric shapes of holding part and locking part, each in the locking position;

Fig. 10:

a compilation of two Räumschilden with different holding projection distances, these two Räumschilde can be equipped with one and the same wear strip, which has more recesses than each of the two Räumschilde holding projections has;

Fig. 11:

a compilation of two Räumschilden with different holding projection distances, in which case the wear strip has recesses which are laterally expanded to be compatible with both Räumschilden.

In FIG. 1 is located in its position of use and only partially illustrated plow blade of a snow plow designated by the reference numeral 1. The plow blade 1 is reinforced at its lower edge on the back by a reinforcement angle 2. At the front of the plow blade 1 are the reinforcing angle 2 opposite and distributed over the length of the lower edge of the plow blade 1 holding projections 3, of which in the FIGS. 1 and 2 only one is shown. Each retaining projection 3 consists of a holding part 4 which is fixed to the blade 1, and a locking part 5, which is rotatably mounted about an axis of rotation 6 on the holding part which is perpendicular to the plane of the plow blade.

Deviating from the illustrated embodiment, the reinforcement angle 2 can also be arranged on the front or the lower edge of the plow blade. The fastening of the holding part 4 to the plow blade 1 can be direct or indirect, for example, with the interposition of a shock absorber rail or reinforcement angle 2. As fastening means in addition to the material shown in the drawing cohesive weld between the holding part 4 and the reinforcement angle 2 and positive or frictional connections in Question, z. B. screw, connectors or clamp connections. It is essential that the holding part 4 is fixed non-rotatably with respect to the plow blade 1, in such a way that of the plow blade 1 sufficiently large forces on the retaining projections 3 can be transmitted to the wear strip.

Both the holding part 4 and the rotatable fastened to this locking part 5 have in relation to the axis of rotation 6 of the locking member 5 radial projections and radial recesses, which are perpendicular to the dozer blade in the unlocked position of the locking member aligned.

In the embodiment of FIGS. 1 . 2 . 3 and 4 have the holding part 4 on the one hand and the locking part 5 on the other hand each have the shape of a rectangle, the short sides of the rectangles each projecting in relation to the axis of rotation 6 of the locking member 5 in the radial direction and thus represent the radial projections, while the long sides of the rectangles in With respect to this axis of rotation 6 jump back in the radial direction and thus form the radial recesses. In the unlocked position (not shown in the drawing) are the rectangular holding part 4 and the also rectangular locking part 5 congruent to each other. Twisting the locking member 5 by 90 ° about the axis of rotation 6, it is in the locked position (see. FIGS. 1 . 2 . 3 and 4 ), in which the radial projections of the locking part 5 (ie, the narrow sides of the rectangular Locking part 5) project radially beyond the radial recesses of the holding part 4 (ie, the longitudinal sides of the holding part 4).

On the retaining projections 3 a wear strip 7 is attached. For this purpose, the wear strip 7 is where the holding projections 3 are located, each provided with recesses 8, the inner contours of which correspond to the outer contours of the holding part 4 and locking part 5 in the locking position. In the embodiment of FIGS. 1 . 2 . 3 and 4 these recesses 8 accordingly have a rectangular inner contour, such that the holding projection 3 fits exactly into the recess 7 when the unlocking part 5 is in the unlocking position.

During assembly of the wear strip 7, this is pushed onto the retaining projections 3 until it lies in a plane with the holding parts 4. Then, all the locking members 5 are rotated about the respective axes of rotation 6 by 90 °, so that the radial projections of the locking member 5 press from the outside against the located in the radial recesses of the holding part 4 areas of the wear strip 7. The axis of rotation 6 is embodied by a clamping screw 6a, the head of which bears against the locking part 5 from the outside and whose shank penetrates the locking part 5 and can be screwed into the holding part 4. This clamping screw 6a braces the locking member 5 against the wear strip 7 and the holding part. 4

For disassembly, the locking parts 5 are rotated back into the unlocked position after loosening the clamping screws 6a, so that the wear strip 7 can be easily removed from the support members 3.

How to continue FIG. 1 it can be seen, the locking member 5 is secured in the locked position against rotation by a located on the underside of the locking member 5 projection 5a, which engages positively in a corresponding recess 4a in the fixed holding part 4. Of course, it is also possible to use other anti-twist devices common in the prior art instead of this anti-twist device.

Furthermore, it is provided that the outer contour of the locking part 5 gradually widens in the direction of the plow blade until the outer contour of the holding part 4 is reached. As a result, the sliding of the recesses 8 in the wear strip 7 on the individual holding projections 3 is facilitated.

As in FIG. 2 illustrated, the holding part 4 is provided with a stop block 9 having a stop 9a, on which the locking member abuts in the locking position, and further comprises a stop 9b, on which the locking member 5 abuts in the unlocked position. Between these two stops 9a and 9b, the locking member 5 can rotate by 90 °.

According to the embodiment FIG. 3 is additionally provided between the head of the clamping screw 6a and the locking member 5, a slip clutch 10 which is biased by a arranged between the holding part 4 and the locking member 5 spring 11 and the locking member 5 in the respective direction of rotation of the clamping screw 6a entrains until the locking member strikes one of the stops 9a or 9b. The complete unscrewing of the clamping screw 6a is prevented by a limit stop 12 located at the end of the clamping screw 6a.

Like from the FIGS. 5 to 9 can be seen, other geometric shapes of holding part 4 and locking member 5 are possible. You can go to FIG. 5 For example, have the shape of a rhombus, after FIG. 6 the shape of an ellipse, after FIG. 7 the shape of a four-pointed cross with arms rounded at the ends, behind FIG. 8 , the shape of an equilateral triangle or after FIG. 9 the shape of a double trapezoid. Like a comparison of FIGS. 4 to 9 shows, arise in the various geometric configurations depending on the respective angle of rotation different coverage areas of the locking position located in the locking position 5 on the wear strip 7, so that it is possible to optimally adapt the respective fastening device to the requirements.

FIG. 10 schematically shows two Räumschilde 1A and 1B of different manufacturers A and B with different holding projection distances. Below is in FIG. 10 a wear strip 7 shown, which fits to the two Räumleisten 1A and 1B. For this purpose, the wear strip 7 has more recesses 8 than each of the clearing bars 1A or 1B has retaining projections. If the clearing blades 1A or 1B are equipped with the wear strip 7 shown below, then some of the recesses 8 in the wear strip 7 remain unoccupied. So that snow can not pass through the unoccupied recesses 8 during operation, all recesses 8 are provided with a rubber wall during the production of the wear strips 7. This thin rubber wall can be cut out by the operator of the snow plow in case of need with the knife.

FIG. 11 again shows schematically two Räumschilde 1A and 1 B of different manufacturers A and B with different holding projection distances. In order to make the wear strip 7 shown below compatible with both Räumleisten 1A or 1 B, the recesses 8 in the wear strip 7 are so widened that the holding projections of both clearing strips 1A and 1 B can pass. These expansions in the wear strip 7 are dimensioned so that seen in the longitudinal direction of the wear strip 7 at least one retaining projection 3 rests against the left and a retaining projection 3 on the right recess recess of a recess 8. This ensures that despite the widened recesses 8, the wear strip 7 remains positively fixed in all conceivable directions on the plow blade 1.

Claims (16)

1. A snow plough comprising a clearing blade, an interchangeable wear strip and a device for fixing the wear strip (7) to the clearing blade (1), comprising holding projections (3) which are arranged on the clearing blade (1) and which project in a direction towards the wear strip and which engage into openings (8) in the wear strip (7),
   characterised in that

   - each holding projection (3) comprises a holding portion (4) fixedly connected to the clearing blade (1) and a locking portion (5) which is connected to the holding portion (4) and which is rotatable about an axis of rotation (6) extending perpendicularly to the clearing blade (1) between an unlocking position and a locking position,

   - both the holding portion (4) and also the locking portion (5) are provided in relation to the axis of rotation (6) of the locking portion (5) with radial projections and recesses which are aligned with each other viewed perpendicularly to the clearing blade (1) in the unlocking position of the locking portion (5),

   - the internal contours of the recesses (8) in the wear strip (7) correspond to the external contours of the holding portions (4) and locking portions (5) in the unlocking position, and

   - in the locking position the projections of the locking portion (5) are disposed over the recesses of the holding portion (4) and press from the outside against the regions of the wear strip (7), that are in the recesses of the holding portion (4).
2. A snow plough according to claim 1 characterised in that the possible pivotal angle of the locking portion (5) is limited by abutments (9a, 9b) on the holding portion (4), that are associated with the locking position and the unlocking position.
3. A snow plough according to claims 1 and 2 characterised in that the locking portion (5) can be braced against the holding portion (4) and the wear strip (7) by means of a clamping screw (6a) extending on the axis of rotation (6), wherein arranged between that clamping screw (6a) and the locking portion (5) is a slip coupling (10) which upon rotation of the clamping screw (6a) entrains the locking portion (5) in the respective direction of rotation of the clamping screw (6a) by frictional flow until it abuts against the abutment (9a, 9b) of the holding portion (4), that is associated with the locking position or the unlocking position.
4. A snow plough according to claim 3 characterised in that the slip coupling (10) has a spring (11) which is supported against the holding portion (4) and presses the locking portion (5) in the direction of the axis of rotation (6) against the head of the clamping screw (6a).
5. A snow plough according to claim 1 characterised in that the locking portion (5) is secured to prevent rotation thereof in the locking position.
6. A snow plough according to claim 1 characterised in that the external contour of the locking portion (5) gradually enlarges in a direction towards the clearing blade (1) until the external contour of the holding portion (4) is reached.
7. A snow plough according to claim 1 characterised in that the holding portion (4) and the locking portion (5) are in the shape of a rectangle viewed in a direction towards the clearing blade (1).
8. A snow plough according to claim 1 characterised in that a larger number of recesses (8) are provided in the wearing strip (7) than holding projections on the clearing blade (1).
9. A snow plough according to claim 1 characterised in that the recesses (8) in the wear strip (7) are enlarged in the longitudinal direction of the wear strip (7) in such a way that said wear strip can be fixed to the clearing blade (1A, 1B) of different snow plough manufacturers with differing spacings of the holding projections.
10. A snow plough according to claim 9 characterised in that the enlargements of the recesses (8) in the wear strip (7) are of such dimensions that viewed in the longitudinal direction of the wear strip in relation to each clearing blade type at least one holding projection bears against the left-hand inside edge portion of a recess (8) and a holding projection bears against the right-hand inside edge portion of the recess.
11. A snow plough according to claim 9 characterised in that some or all recesses (8) in the wear strip (7) are closed by thin rubber walls vulcanised in position.
12. A snow plough according to claim 1 characterised in that the holding portion (4) and the locking portion (5) are in the form of a rhombus viewed in a direction towards the clearing blade (1).
13. A snow plough according to claim 1 characterised in that the holding portion (4) and the locking portion (5) are in the form of an ellipse viewed in a direction towards the clearing blade (1).
14. A snow plough according to claim 1 characterised in that the holding portion (4) and the locking portion (5) are in the form of a four-arm cross with projections rounded at the ends viewed in a direction towards the clearing blade (1).
15. A snow plough according to claim 1 characterised in that the holding portion (4) and the locking portion (5) are in the form of an equilateral triangle viewed in a direction towards the clearing blade (1).
16. A snow plough according to claim 1 characterised in that the holding portion (4) and the locking portion (5) are in the form of a trapezium viewed in a direction towards the clearing blade (1).

Images