EP0580978A1 - Snowplough - Google Patents

Abstract

A snowplough comprises a yieldable plough blade (1). The yielding movement is ensured by means of guide elements (19) which can travel along a guideway (15). To improve the yielding behaviour even when running into a ground obstacle on one side, or even a lateral obstacle in the case of a snowplough comprising a plurality of plough-blade elements, provision is made for at least two laterally mutually offset plough-blade segments to be yieldably suspended independently of one another. This takes place via a three-point or the trapezium four-point support of the plough blade relative to the supporting frame (5). There is additionally provided, for the plough-blade segments (1), a centring device (24) for relative-position centring of the plough-blade segment (1) concerned relative to the supporting frame (5). <IMAGE>

Description

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

In practice, a wide variety of suspension and evasive structures for snow plows have become known. Constructions are known in which the deflectable ploughshare segments can be pivoted about a more or less fixed horizontal axis against the force of a restoring device. In other constructions, the ploughshare segments are suspended via a parallel or trapezoidal link arrangement in the form of rigid links or so-called elastomeric bands. In practice, snow plows according to DE-AS 12 78 465 using several elastomeric bands running in parallelograms have proven themselves in practice.

In the case of rigid handlebar arrangements in particular, the problem has emerged that the individual ploughshare segments, ie their scraper bars, can only deflect to the rear and upwards. When starting off against a ground obstacle However, only on one side of a ploughshare segment with the initiation of a tilting and torque this can lead to disadvantages and to the occurrence of considerable force and stress peaks with the result of damage to at least parts of the plow.

A snow plow which has become known from DE-A 10 97 463 comprises a ploughshare which is held in its clearing position by means of lower knee joint levers attached to the side of the ploughshare and which can be pivoted against the force of a spring accumulator in a raised alternative position. In addition to the knee joint levers attached to the side, the ploughshare is held by two support guides which run essentially vertically laterally in the starting position and are held and anchored on the plow frame carrier side, that is to say on the vehicle side. Through these slot guides, which run essentially vertically and parallel to one another, a horizontally oriented longitudinal bar which is attached to the rear of the ploughshare and which is raised and lowered in the slot guide when pivoting between the evasive and the clearing positions protrudes. Finally, a further return spring is provided on top.

In this embodiment, the connection between the two-armed swivel levers and the ploughshare is realized via ball joints in order to ensure better mobility of the ploughshare compared to a simple bolt bearing when overcoming unilateral road obstacles.

A generic snow plow has become known from AT 392 993 B. This snow plow comprises a support frame for a one- or multi-part plow share, the plow share using rollers movable in at least two guides and at least one on the support frame and on the Ploughshare pivotally mounted handlebar is adjustable against the action of a return device from the working position to a high position and the handlebar in the working position of the ploughshare is aligned approximately in the working direction. So that a height adjustment when approaching a ground obstacle is made possible without additional return springs, it is provided here that the guides include an acute angle of approximately 30 ° to 70 ° with the working direction of the ploughshare. However, even with this generic snow plow, it proves to be extremely disadvantageous that, in particular when starting from one side on side or ground obstacles, canting can occur which hinder an evasive movement and even prevent it in the worst case, and ultimately lead to impairment or even damage to the ploughshare or the can guide the ploughshare-carrying escape device.

The object of the present invention is therefore to create a snow plow based on the last-mentioned prior art, the clearing behavior and in addition also the evasive behavior thereof being improved even when approaching a ground obstacle or even a side obstacle on one side. The improvement is said to be in a further development of the invention even with a different setting of the rake angle, i. H. the angle of the scraper bar to the road surface can be easily achieved.

The object is achieved according to the features specified in claim 1. Advantageous embodiments of the invention are specified in the subclaims.

The snow plow share according to the invention is characterized in that even when several are used side by side arranged ploughshare segments, the individual ploughshare segments can not only be raised and lowered relative to each other independently between their clearing and evasive position, but also to a certain extent a one-sided evasive movement including the possibility of a slight twisting movement (around an imaginary one) when approaching one side or ground obstacles to be able to carry out essentially horizontally in the direction of travel). However, in order to ensure that the individual ploughshare segments lying next to one another do not collide with one another in the clearing operation, an alignment device is integrated, by means of which the respective plow share segment is held in a predefined exact alignment position above the vehicle-side support frame.

In order to enable a tilting movement even when approaching a ground obstacle on one side, the individual ploughshare segment is preferably held on the supporting frame in the manner of a trapezoidal or three-point suspension.

Particularly preferred is an embodiment with a more or less rigid pair of parallel link arrangement at the bottom and a central guide link at the top, in which a sliding block engages. The link guide and the sliding block slidably guided therein are alternately at least indirectly connected to the support frame or the associated ploughshare segment.

The pivot bearings of the handlebars are designed at least in a minimum range as spatially pivotable pivot bearings, ie preferably as spatially movable rubber bushings. It is also possible to design the handlebar from elastomeric material, possibly with an integrated reinforcement or reinforcement. This can preferably consist of one Perforated grids exist to achieve the best possible connection between the integrated reinforcement and the elastomeric material.

The link guide preferably has a linear travel path for the sliding block or slide. The sliding block engaging in it is provided with opposing plane-parallel surfaces.

The slide guide and the sliding block slidably mounted in it can be adjusted laterally to one another by a preselectable amount, in order to also allow the individual ploughshare segment to be adjusted laterally to a pre-selectable extent in the event of uneven ground.

The individual ploughshare segment can also be kept biased into its centered central position in the adjustment range between the clearing position and the maximum avoidance position by means of a spring device.

Finally, in a particularly preferred embodiment of the invention, the link guide and thus the clearing angle on the clearing bar can be changed in a presettable manner, in order to be able to achieve and set the desired optimal clearing conditions, in particular at different driving speeds, even while driving.

Figur 1 :

eine schematische Seitenansicht quer zur Fahr- und Räumrichtung einer erfindungsgemäßen Pflugschar in Räumstellung;

Figur 2 :

eine entsprechende Darstellung eines einzelnen Pflugscharsegmentes bei Erreichen der endgültigen Ausweichstellung;

Figur 3 :

eine rückwärtige Ansicht eines Pflugscharsegments mit der erfindungsgemäßen Ausricht- und Zentriereinrichtung (bei einer Ausführung ohne bewegliche Kulisse);

Figur 4 :

eine vergrößerte Detaildarstellung eines zu Figur 1 abgewandelten Ausführungsbeispieles;

Figur 5 :

eine auschnittsweise Schnittdarstellung längs der Linie A - A in Figur 4;

Figur 6 :

ein Diagramm zur Verdeutlichung der Räumkraft-Ausweich-Kurve;

Figur 7 :

eine Seitendarstellung eines einzelnen Pflugscharsegments ähnlich dem Beispiel gemäß Figur 1, jedoch bei dazu steiler eingestelltem Räumwinkel (bei einer Ausführung mit beweglicher Kulisse);

Figur 8a-8c :

drei Ansichten des steiler eingestellten Pflugscharsegmentes in Räum-, einer Zwischen- und der endgültigen Ausweichstellung (bei einer Ausführung mit beweglicher Kulisse) und;

Figur 9a-9b :

ein abgewandeltes Ausführungsbeispiel eines Pfluglenkers in Draufsicht bzw. Seitenansicht in Richtung der Verschwenkachse.

The invention is explained in more detail below with reference to drawings. The individual shows:

Figure 1:

a schematic side view transverse to the direction of travel and clearing of a ploughshare according to the invention in clearing position;

Figure 2:

a corresponding representation of an individual Ploughshare segment upon reaching the final avoidance position;

Figure 3:

a rear view of a ploughshare segment with the alignment and centering device according to the invention (in an embodiment without a movable backdrop);

Figure 4:

an enlarged detail view of an embodiment modified from Figure 1;

Figure 5:

a partial sectional view along the line A - A in Figure 4;

Figure 6:

a diagram to illustrate the evacuation curve;

Figure 7:

a side view of a single ploughshare segment similar to the example of Figure 1, but with the rake angle set steeper (in an embodiment with a movable backdrop);

Figure 8a-8c:

three views of the steeper ploughshare segment in clearing, an intermediate and the final avoidance position (in the case of a version with a movable backdrop) and;

Figure 9a-9b:

a modified embodiment of a plow handlebar in plan view or side view in the direction of the pivot axis.

In the side view according to Figure 1 is the invention Ploughshare or a ploughshare segment 1 with a lower clearing bar 3 is shown, each of which is held pivotably by an adjacent ploughshare segment independently of a generally height-adjustable support frame 5 between the clearing position shown in FIG. 1 and the upper alternative position shown in FIG. 2.

For this purpose, two thrust links 7 are provided for each ploughshare segment 1, each lying adjacent to the side section of a ploughshare segment, which are supported at their opposite ends in a pivot bearing 9 'or 9' '.

As a rule, two, ie. H. a pair of underlying thrust links 7 related.

The leading pivot bearing 9 'is formed, for example, on a vertically extending reinforcing rib 11 on the rear and the trailing pivot bearing 9' 'is formed on a corresponding section of the support frame 5. The pivot bearings not only allow pivoting about their horizontal bearing axis, but also in an at least limited area in a direction deviating from this. This can be done, for example, by using ball-and-socket joints or, as in the present exemplary embodiment, in the form of spatially movable rubber bushings, which, on the other hand, are less expensive. (A handlebar made of elastomeric material with a built-in reinforcement is also possible, as will be explained below with reference to FIGS. 9a and 9b).

The related pivot bearings 9 'and 9''ultimately also enable a spatial evasive movement of the handlebars and thus of the ploughshare segment 1 in question. In other words, the individual ploughshare segments 1 also carry out a spatial adjustment movement, that is to say also perform an adjustment movement at least in a certain area and even an axis essentially transverse to a horizontal axis in the direction of travel or in the transverse direction of the ploughshare. This results in an at least slight spatial pivoting movement, including a lateral offset and / or twisting movement about the above-mentioned essentially leading horizontal axis, especially when approaching a side or side ground obstacle.

Each ploughshare segment 1 is supported in addition to the two rigid thrust links 7 via a further adjustment device located above the links 7 with respect to the support frame 5, which is arranged above the horizontal equatorial plane in relation to the arcuate curvature of the plow share segments 1 when viewed from the side.

For this purpose, an elongated slot-like link guide 13 is provided which is fixedly connected to the supporting frame 5 and which has a straight slot opening or guide track 15 which extends in the lateral direction of the ploughshare. The link guide 13 is supported and held on the support frame 5, in the present case by means of a fixed support 17, for. B. in the form of a support plate 17th

A slider 19 with opposing plane-parallel surfaces engages in the link guide 13 and can be displaced in the longitudinal direction of the link guide 13.

FIG. 3 shows a rear sectional illustration along the line III-III in FIG. 1. From this it can also be seen that the slider 19 extends beyond the link guide 13 in the transverse direction and through lateral holding plates 21 is held by means of a screw connection 23. The holding plates 21 are welded to the back of the ploughshare segment 1 concerned or to the reinforcing ribs 11 running thereon at a transverse distance from top to bottom.

At the lower end of the link guide 13 there is a stop 25 which is angular or roof-shaped to the horizontal and which is fixedly connected to the support frame 5 or to the support 17 in FIGS. A buffer, preferably a rubber buffer 27, is firmly screwed onto the side of the angular stop 25 facing the guide 13. From the illustration according to FIG. 2 it can be seen that the ploughshare-side retaining plates 21 provided adjacent to the angled or roof-shaped stop 25 are complementary to the stop 25 and rest on the rubber buffer 27 in the lower clearing position shown in FIG. This alignment and centering device 24 ensures automatic self-alignment and centering of the respective ploughshare segment 1 with respect to the associated supporting section of the supporting frame 5, so that two laterally adjacent ploughshare segments do not collide with one another in the clearing position.

The centering device explained in particular with reference to FIG. 3 acts especially in the starting and clearing position when the ploughshare segment 1 is not pivoted in the avoiding direction. As soon as the ploughshare segment 1 lifts off its starting centering position shown in FIG Centering device on. The centering device illustrated in FIG. 3 is designed in the manner of a complementary roof construction, by means of which the ones attached to the rear of the ploughshare segments 1 and to the left when viewed from the back of the link guide and the right-hand sloping retaining plates 21, which are aligned symmetrically to the link guide, interact with the correspondingly inclined stop surfaces 25 via the rubber buffers 27 located between them.

oft bis zu 10

verstellt werden. Die überfahrbaren Höhen können durchaus 18 cm und mehr erreichen.When approaching a ground obstacle, the respective ploughshare segment 2 is then raised from the clearing position shown in FIG. 1 to the maximum avoidance position shown in FIG. 2, the lower pair of thrust links 7 pivoting upward about their pivoting bearing on the support frame side and in the link guide 13 Slider 19 is moved to its upper end position. For this purpose, as shown in the drawings, the slider 19 is rotatably held on its pivot axis 19 ′ formed by the horizontal screw connection 23 relative to the support plates 21 on the ploughshare side. A stop limit for the maximum avoidance position can also be provided at a suitable point. During this evasive movement, a spring force accumulator 33 suspended between the ploughshare segment 1 and the support frame 5 between points 29 and 31 is subjected to tension, via which the restoring movement is then also initiated. In the exemplary embodiment shown, the corresponding clearing angle α between the plane of the clearing plate and the vertical can be 31, for example

often up to 10

be adjusted. The heights that can be driven over can easily reach 18 cm and more.

Basically, it is already noted here that the link guide 15 can also be firmly connected to the respective ploughshare segment 1 and the sliding block 19 which can be displaced therein can be rotatably supported and supported on a holding section which is firmly connected to the supporting frame 5.

In the event of an evasive movement, even when moving off on a one-sided ground or side obstacle, the upper one allows Link guide not only a lateral evasive movement of the ploughshare segment 1 in question in the substantially horizontal transverse direction of the link guide 15, but also, with regard to the aforementioned pivot bearings 9 'and 9''which permit a spatial pivoting movement, also an at least slight rotational movement of the plow share segment 1 concerned by an essentially horizontal and imaginary axis of rotation running in the direction of travel. It also has an advantageous effect that the ploughshare segment 1 in question, around its central support above the sliding block 19 held in the link guide 15, almost automatically swings out again in the horizontal position, so that even when the ploughshare is raised, the individual ploughshare segments 1 each seek their own Take the usual horizontal starting position.

Reference is made below to FIG. 4, in which a slightly modified exemplary embodiment is shown.

In contrast to FIGS. 1 and 2, in which the spring energy store 33 is anchored between a suspension point 29 provided in the upper end region of the ploughshare segment 1 and an overhead suspension point 31 on the supporting frame, in the exemplary embodiment according to FIG. 4, the return spring 11 is in the region of the holding plates 21 of the slide 19 and on the other anchored at a low hanging point on the support frame 5.

In addition, in this embodiment, a force limiter pawl 37, which is biased by a spring 35, is also provided, the end face 38 of which acts through the spring 35 in the clearing position on a lateral recess section 39 of the link guide 13, and there on a shoulder designed in an evasive position in the manner of an inclined plane 41 is present.

When approaching a ground obstacle, the triggering forces must also be exceeded first by the inclined surface of the shoulder 41 (which corresponds to a corresponding chamfer in the end region of the force limiter pawl 37) and the spring 35, so that the ploughshare segment in question can avoid an obstacle when approaching . When a certain clearing force is exceeded, the force limiting pawl 37 is then pressed out of the recessed portion 39 and over the shoulder 41 in its guide 43 welded onto the rear of the ploughshare segment 1, so that the slide in the link guide can be moved further and the ploughshare segment can evade. During the return movement of the ploughshare segment 1, the force limiting pawl 37 engages again on the shoulder 41 in the recessed section 39.

Other force limiters can also be provided.

For example, it would be possible to use a so-called gas spring, by means of which the ploughshare segment in question is kept in the clearing position until a certain triggering force is exceeded. Due to the preload pressure, a gas spring has a preload force that must be exceeded in order to be able to cause a change in length. The gas spring also provides the necessary restoring action after the ploughshare segment 1 has dodged.

The particularly flat force-stroke characteristic curve according to FIG. 6 is particularly evident in this context. From this it can be seen that, based on the evasion height, an almost zero clearing force-evasion height characteristic curve is possible, with the result that only relatively weakly dimensioned helical tension springs 11 are necessary for the return movement.

From Figures 4 and 5 it can also be seen that the force limiter, i.e. H. the force limiter pawl 37, which can be moved in the form of a guide 43, can be inserted into the holes 45 in the guide 43 attached to the ploughshare side and in the bolt-shaped force limiter pawl 37, a locking pin 47. In this case it is impossible to avoid the ploughshare. Such an arrangement is also particularly suitable in the case of ground shifting work, in which evasion should not be possible.

Reference is made below to FIG. 7.

beträgt, wird durch die Verstellung des Verstellzylinders 51 beispielsweise ein Winkel α von 13,5

eingestellt. Auch andere Räumwinkel sind einstellbar. Die Veränderung des Einstellwinkels α kann auch während der Fahrt vom Fahrerhaus des Fahrzeuges aus vorgenommen werden. Durch Verstellen und Fixieren der Kulissenführung in einer vorwählbaren Lage durch entsprechende Betätigung des Stellantriebes 51 kann eine Anpassung an die Räumsituation und das vorteilhafte Ausweichverhalten wie Auswurfverhalten des wegzuräumenden Schnees kontinuierlich auch während der Räumung vorgenommen werden. Denn insbesondere bei unterschiedlichen Geschwindigkeiten verändert sich das Auswurfverhalten des wegzuräumenden Schnees in Abhängigkeit der Geschwindigkeit.The side view of a ploughshare segment 1 corresponds in principle to the embodiment according to FIG. 1. In this embodiment, however, on the one hand, the support 17 is held in a vertical plane about a pivot axis 53 located on the support frame 5, the support and the link guide connected to it in a rotationally fixed manner 15 can pivot via an adjusting cylinder 51, for example, from the position shown in FIG. 1 to the position shown in FIG. For this purpose, the adjusting cylinder 51 is supported on a horizontal axis of rotation 55 on the support frame 5 and on an additional axis of rotation 57 connected at least indirectly to the link guide 13. By moving the actuator 51 in and out, the ploughshare segment 1 in question and, above all, the angle α of the clearing bar are also set differently. While in the retracted position of the adjusting cylinder 51, which is not shown in more detail in FIG. 1, the clearing and scraping angle α from the plane in the clearing bar to the vertical is approximately 31

is, by adjusting the adjusting cylinder 51, for example, an angle α of 13.5

set. Other clearing angles can also be set. The change in the setting angle α can also occur while driving be carried out from the driver's cab of the vehicle. By adjusting and fixing the link guide in a preselectable position by corresponding actuation of the actuator 51, an adaptation to the clearing situation and the advantageous evasive behavior such as ejection behavior of the snow to be cleared can also be carried out continuously during the clearing. Because especially at different speeds, the ejection behavior of the snow to be cleared changes depending on the speed.

The actuator 51 can take the form of a lockable hydraulic cylinder, a hydraulic motor, pneumatic cylinder or, for example, an electric or electric geared motor or in some other way.

Although in this exemplary embodiment the link guide was pivoted from the inclined position shown there into an almost vertical position, the further adjustment and evasive characteristics are practically unchanged, as is also shown with reference to FIGS. 8a to 8c. Even the restoring forces hardly change.

Above all, the alignment and centering device 24 explained with reference to FIG. 3, which in this embodiment is connected to the link 13, is always functional with different presetting of the rake angle α. When adjusting the link 13, the angular positions of the stop surfaces change relative to each other. For this reason, spherical rubber stop buffers 27 are used. If the backdrop is exactly between the two end positions, the stop surfaces are at the same angle. In this way, the angle difference between the stop surfaces is halved. This angular difference is well balanced and coped with by spherical buffers 27.

This enables the use of uniform plowshares.

The explained aligning and centering device 24 is effective in the end pivoting area in the direction of the clearing position. It is not effective in the intermediate adjustment and avoidance range. However, as can be seen directly from FIG. 3, the spring plates 21 and the thickness of the link guide 13 could be pre-centered in the position shown in FIG. 3 by a spring preload due to the laterally possible offset of a snow plow segment that is fixed relative to the support frame, so that between the final clearing position and the maximum avoidance position there is an effective preload in the central centering position corresponding to the selected spring preload.

Finally, reference is also made to FIG. 9, which shows a push link 7 'intended for particularly hard clearing operations.

This push rod 7 'is made of an elastomeric material such as Vulkollan. So that this handlebar can absorb longitudinal forces, a perforated plate 69 made of steel is cast in with it. Steel or plastic pipes are cast into the bearing eyes for storage. Since the connection of the perforated plate 69 and the tubes for the bearing eyes 71 consists only of Vulkollan, this handlebar has special spatial alternatives. The holes in the perforated plate and the resulting plastic bridges also enable the elastomeric material to be optimally welded to this internal reinforcement 69.

As can be seen from the side view of the push rod according to FIG. 9b, it is aligned at its present joint or support point with a support frame side lying buffer 75 provided. If a ploughshare segment was swiveled into the evasive position according to FIG. 2, then the buffer 75 (not shown there in FIG. 2) would strike directly with its protruding nose on the supporting frame or on the likewise fixed support 17 fixedly attached to the supporting frame 5. This results in additional restoring forces Initiation and return of the ploughshare segment in the evasive position effected in clearing position.

Claims (19)

Snow plow with evasible ploughshare, with the following features at least two ploughshare segments (1) which are laterally offset from one another and which can be moved independently of one another are provided, - The ploughshare segments (1) are suspended from a supporting frame (5) that can be attached to a vehicle, - The suspension comprises an at least three-point-shaped support between the ploughshare segment (1) and the support frame (5) with a handlebar and an adjustment device located at the bottom, - The adjustment device comprises a guide element which can be moved along a guide path, by means of which the respective ploughshare segment (1) is supported on the top against the support frame, characterized by the other features - The at least two ploughshare segments (1) are at least in a partial swiveling range of the entire evasive range of the ploughshare segment (1) in question is also held adjustable with a lateral escape component, - The at least two ploughshare segments (1) are held rotatable at least in a slight angular range about an essentially horizontal axis running in the direction of travel, - The handlebars (7) are articulated at their forward as well as at their trailing end by means of a rotary bearing (9 ', 9'') allowing a spatial adjustment movement, and - There is a ploughshare segment (1) in the clearing position in a predetermined relative position relative to the support frame (5) holding centering device (24). Snow plow according to claim 1, characterized in that the ploughshare segments (1) are provided with two thrust links (7) which are laterally offset to one another at the bottom in the transverse direction, and a link guide (13) arranged in a top view between the two thrust links (7) and above them with a in the Link guide (13) longitudinally movable slider or slide (19) are supported with respect to the support frame (5). Snow plow according to claim 1 or 2, characterized in that the thrust links (7) are rigid or at least essentially rigid. Snow plow according to one of claims 1 to 3, characterized in that the sliding piece (19) is rotatably held on a holding device (21) via a pivot axis (19 '), and in that the holding device (21) with an associated ploughshare segment (1) and the link guide (13) is connected to the supporting frame (5) or vice versa and is supported at least indirectly on it. Snow plow according to one of claims 1 to 4, characterized in that the slide (19) in the associated Guide path (15) of the link guide (13) are arranged laterally by a preselectable amount relative to each other. Snow plow according to one of claims 1 to 5, characterized in that the centering device (24) also comprises a stop (25) which extends at an angle or in a roof shape in the opposite direction to the horizontal plane and to the vertical adjustment direction of the ploughshare elements (1) and which extends over the supporting frame ( 5) is supported and held, and which cooperates with a corresponding complementary angular or roof-shaped stop (holding plate 21) connected and supported with the associated ploughshare element (1). Snow plow according to one of claims 1 to 6, characterized in that buffers (27) are provided between the fixed and the movable stop (25, 21). Snow plow according to one of claims 1 to 7, characterized in that the link guide (13) and thus the setting angle (α) between the clearing bar (3) can be preset and fixed in vertical for different angle settings. Snow plow according to claim 8, characterized in that an actuator (51) is provided for angularly adjusting the link guide (13) and thus a clearing bar (3) relative to the supporting frame (5) carrying it. Snow plow according to Claim 8 or 9, characterized in that the link guide (13) can be pivoted relative to the support frame (5) via an axis of rotation (53), the actuator (51) between the support frame (5) and the link guide (13) at least is indirectly supported. Snow plow according to one of claims 8 to 10, characterized in that the actuator (51) can also be actuated while driving and can be locked or locked in the desired position. Snow plow according to one of claims 8 to 11, characterized in that the actuator (51) consists of a hydraulic motor, hydraulic cylinder, pneumatic cylinder or an electric actuator. Snow plow according to one of claims 1 to 12, characterized in that a force limiter, preferably attached to the link guide (13), is also provided which only allows the ploughshare segment (1) to deflect after a triggering force has been exceeded. Snow plow according to claim 13, characterized in that the force limiter can be locked, preferably manually locked. Snow plow according to one of claims 1 to 14, characterized in that the thrust links (7) comprise a shock-absorbing device. Snow plow according to one of claims 1 to 15, characterized in that the thrust links (7) consist of elastomeric material and a reinforcement, preferably an internal reinforcement (69). Snow plow according to claim 16, characterized in that the reinforcement consists of a perforated plate (69). Snow plow according to one of Claims 1 to 17, characterized in that tubes (71), preferably made of steel or plastic, are cast in at the bearing points in the push links (7). Snow plow according to one of claims 1 to 18, characterized in that the rotary bearings (9 ', 9'') leading and trailing to the links (7) are designed in the form of bushes made of elastomeric material, which permit spatial movement, preferably in the form of rubber bushes are.

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