DE4124469C1 - Snow clearance plough share - has clearance bar fitted to underside of share and also has linkage rods connecting share to frame - Google Patents

Abstract

A clearance bar (9) is rigidly fitted to the underside of the share (1) and the rotation point is defined by the intercepts of the two rods (7,7'). The line (V) through the pivot point (D) to the bar edge road contact point (B) forms an angle (w') of 30-45 deg with the road (6). The release angle (w) between the perpendicular (S) onto the road (6) and the tangent (T) at contact point (B) to the curve travelled by the edge (A,11) on meeting obstacles is also between 30 and 45 deg. The attack angle (a) of the share relative the perpendicular (S) lies between 0 and 11 deg in the bottom share setting. USE/ADVANTAGE - Snow clearance, eg rail etc fitted streets. Linkage operated share yields back at obstacles to pass over and maintain clearance.

Description

The invention relates to a snow plow in the preamble of the claim 1 specified Art.

In general, snow plows have the task of cleaning the snow from the Clear the road and at the same time also avoid any obstacles to be able to cross well, for example sewer cover edges or tram rails. In the snow plows known so far, however, the one condition the other. For example, is a snow plow for one optimal snow removal trained, he can do obstacles only bad run over. Conversely, the snow removal properties suffer when the Snow plow can optimally drive over obstacles.

A snow plow in the form of a handlebar plow of the type specified in the introduction is known from DE-AS 24 21 713. This is by means of a support frame can be raised, lowered and for snow removal to the right or left pivotally attached to the front of a carrier vehicle. It is on the Support frame on at least two handlebars a ploughshare or there are several plowshares arranged side by side attached. The two drivers are not aligned parallel to each other, the two Extension lines of the handlebars in the lower operating position of the ploughshare, if this is on the road, in one in front of the ploughshare hitting intersection.

A disadvantage of this known handlebar plow is that there are always additional ones Arrangements and devices are required to drive over obstacles can be. These can be resilient elements such as an elastically hinged wear rail on the underside of the ploughshare be, which folds backwards when driving over an obstacle. Alternatively has also been practiced, shortening when overloaded or to provide lengthening handlebars, notching devices or the like in order to both good clearance properties as well as sufficient obstacle crossing properties to reach. Technically, all of these are additional  Facilities such as B. shock-absorbing shock absorber strips or shortening or lengthening handlebars that the scraper bottom edge when hitting an obstacle, first parallel to the back of the lane evades. The instantaneous pivot, which by definition is on a vertical to this avoidance direction is not through the handlebar intersections defined, but is located vertically above the lower edge of the scraper. According to the prior art, this is also intended since no other possibility is known, the high mass forces encountered when crossing the obstacle. So you have to do this so far expensive accessories, such as. B. space-reducing and maintenance-prone Shock absorber rails, put up with.

Proceeding from this, the invention is based on the object Achievement of very good snow clearance properties as well as very good obstacle crossing properties to create a constructively simpler snow plow.

As a technical solution, a snow plow with the characteristics of the Claim 1 proposed.

A snow plow designed according to this technical teaching in the form of a Handlebar plow has the enormous advantage that no additional resilient Parts are needed and yet optimal snow removal and optimal Obstacle crossing properties can be achieved. The very good ones Snow removal properties are achieved in that the wear rail is firmly connected to the ploughshare. By means of technical teaching of the snow plow according to the invention is permitted for the first time, handlebar plows to build by the movable handlebar suspension alone Ploughshare with the resulting easy adaptation to the road profile or other road surface height differences both easily height differences can compensate in the road cross section as well as an obstacle can drive over without expensive additional equipment such as shock absorber rails, Shortening or lengthening handlebars, additional flaps or tilt mechanisms to need. This creates an enormous economic Advantage compared to the known snow plows, because otherwise necessary Modules simply drop out and through one of the teaching of the invention appropriate arrangement of the handlebars to be replaced. When it hits  the lower edge of the ploughshare gives way to an obstacle to reduce impact towards the rear and also upwards according to the release curve. Is the obstacle of small or medium size, this movement is enough on the trigger curve backwards and upwards already out to the obstacle to run over. If the obstacle is very large, the lower edge moves so far back and up on the trigger curve until the angle of attack becomes negative, whereby according to the principle of the inclined plane through the Thrust of the carrier vehicle an additional, the ploughshare over the An obstacle-lifting force component is created. A key issue comes the exact definition of the so-called trigger angle to which the direction of the evasive curve of the lower edge of the wear rail the ploughshare when encountering an obstacle of verticals.

In a preferred development, the trigger angle is approximately 37.5 °, d. H. it lies in the middle between the 30 ° and 45 °. The optimum is achieved at exactly 37.5 °. In another preferred Further training, the angle of attack is approximately 5.5 °. The optimum is reached at exactly 5.5 °.

Another preferred development suggests that the level of the instantaneous pivot point above the carriageway is less than 1.5 times the height the articulation point of the lower link above the carriageway. Provided that the height of the instantaneous pivot point according to this advantageous Continuing education is not significantly greater than the height of the vehicle side Articulation point of the lower handlebars above the road are selected the forces of the tension spring not too great, which the ploughshare on the Roadway presses. The height of the instantaneous pivot point is preferred above the roadway approximately 1.35 times the height of the vehicle side Articulation point of the lower handlebar over the road.

Finally, it is proposed in a further development that the support frame both during normal clearing operations and when driving over obstacles is supported on the road by means of support skids. This ensures that the plow frame is the same regardless of the carrier vehicle Height is kept relative to the road, so that the invention Movement kinematics is optimally observed.

An embodiment of a snow plow according to the invention is shown below described with reference to the drawings. In these shows:

Figure 1 is a schematic side view of the snow plow in the operating position with normal snow removal operation.

FIG. 2 shows the snow plow in FIG. 1 when it encounters a small obstacle;

Fig. 3 shows the snow plow in Fig. 1 when driving over a large obstacle.

The entire snow plow with its ploughshare 1 is attached to the front of a carrier vehicle, not shown, with the aid of a lifting, swiveling and carrying device via a connecting structure 2 . The pivoting device is indicated by a turntable joint 3 on which a support frame 4 for the ploughshare 1 is arranged. In the lower area, a support skid 5 is provided which is supported on the carriageway 6 and holds the support frame 4 at the same height with respect to this carriageway 6 .

A plurality of plowshares 1 lying next to one another can also be provided, each of which is articulated on the support frame 4 .

The ploughshare 1 is articulated via an upper link 7 and a lower link 7 ' on the support frame 4 in the manner shown. In addition, a spring 8 is arranged in the form of a simple tension spring between the upper area of the ploughshare 1 and the support frame 4 , which presses the plow share 1 onto the roadway 6 . On the underside, the ploughshare 1 has a clearing bar 9 which is rigidly connected to the ploughshare 1 by means of a fastening profile carrier 10 .

The peculiarity of the snow plow lies in the special handlebar kinematics:

In the operating position during normal snow clearing operation, in which the clearing bar 9 of the ploughshare 1 rests with its clearing edge 11 at the point of contact B on the carriageway 6 ( FIG. 1), the center lines L and L 'of the two links 7, 7' intersect in the so-called Instantaneous pivot point D in front of the ploughshare 1 at a height h above the carriageway 6 . The connecting line V of the instantaneous pivot point D with the contact point B is shown in the drawings.

Furthermore, the so-called evasive curve A is drawn in dash-dot lines in the drawings. Among them, 11 to understand the wear track 9 of the plowshare 1 that the curve of the lower edge, which, upon impingement of the plowshare 1 encounters an obstacle 12, 12 'occurs when ie the plowshare 1 evading upwardly around the obstacle 12 12' to drive ( Fig. 2 and Fig. 3). In the contact point B, that is, when the snow plow is in the operating position with normal snow clearing operation, the tangent T is drawn in on the avoidance curve A. This tangent T thus defines the evasive direction of the lower edge 11 of the clearing bar 9 of the ploughshare 1 when the ploughshare 1 strikes an obstacle 12, 12 ' . This tangent T includes the so-called trigger angle w with the perpendicular S to the road 6 , which is in the range between 30 ° and 45 °, preferably 37.5 °. In addition, the connecting line V with the tangent T forms an angle of 90 °.

Furthermore, the angle of incidence a is shown in the drawings, ie the angle which the plane of the scraper bar 9 includes with the perpendicular S to the carriageway 6 . In the exemplary embodiment shown, this is approximately 9 °.

Finally, the height h 'of the vehicle-side pivot point P of the lower link 7' above the road 6 is shown in the drawings.

The advantages of the snow plow according to the invention are as follows:

In the operating position during normal snow clearing operation, the lower edge 11 of the clearing bar 9 of the ploughshare 1 rests in the contact point B on the roadway 6 . This is shown in Fig. 1. The ploughshare 1 is pressed onto the road 6 by means of the spring 8 . Since the height h is not significantly greater than the height h ', the forces of the spring 8 are not too great.

In FIGS. 2 and 3 shows the situation when traveling over a small obstacle 12 (Fig. 2) as well as when driving over a large obstacle 12 '(Fig. 3). Due to the inventive linkage mechanism with the inventive release angle w the ploughshare 1 overrides when hitting the obstacle 12,12 'against the force of the spring 8 from the road 6, and runs over the obstacle while 12,12'. In addition to the aforementioned pressing of the ploughshare 1 onto the road 6 in the operating state in normal snow clearing operation, the spring 8 determines the limiting force on the clearing bar 9 when the ploughshare 1 hits the obstacle 12, 12 ' , when the ploughshare 1 is exceeded in accordance with the invention Kinematics backs along the avoidance curve A and thereby overcomes the obstacle 12, 12 ' . The main advantage is that this is achieved solely by the handlebar kinematics according to the invention, without the need for additional elastic parts, as was previously the case. This creates an enormous economic advantage because otherwise necessary expensive and wear-prone assemblies are eliminated and replaced by a special arrangement of the handlebars 7.7 ' .

Reference list

1 ploughshare
2 adjacent construction
3 swivel joint
4 support frames
5 support skids
6 lane
7 handlebars
7 ′ handlebar
8 spring
9 clearing bar
10 mounting profile supports
11 lower edge of scraper bar
12 obstacle
12 ′ obstacle
A avoidance curve
B point of contact
D instantaneous pivot point
L center line
L ′ center line
P articulation point
S vertical
T tangent
V connecting line
a angle of attack
h height
h ′ height
w trigger angle
w ′ angle

Claims (6)

1. snow plow with a support frame ( 4 ) that can be raised and lowered relative to the front of a vehicle,

• with at least one ploughshare ( 1 ) which is articulated on pairs of links ( 7, 7 ' ) on the support frame ( 4 ), and
• with a spring or the like, which presses the ploughshare ( 1 ) onto the roadway ( 6 ), the rigid links ( 7, 7 ' ) of each pair of links articulated directly on the support frame ( 4 ) being non-parallel to one another and their center lines (L, L ′) have an intersection point in front of the ploughshare ( 1 ),

characterized,

• that a clearing bar ( 9 ) is rigidly arranged on the underside of the ploughshare ( 1 ),
• that the instantaneous pivot point (D) of the lower edge of the scraper bar ( 11 ) relative to the roadway ( 6 ) is defined exclusively by the intersection of the two handlebars ( 7,7 ' ) both during normal clearing operation and when driving over obstacles,
• that on the roadway (6) extending connecting line (V) with the roadway (6) forms an angle between 30 ° and 45 including through the instant center of rotation (D) and the point of contact (B) of the Räumleistenunterkante (11) (w ') °, whereby the tangent (between the perpendicular (S) to the carriageway ( 6 ) and that at the point of contact (B) to the evasive curve (A) of the lower edge ( 11 ) of the ploughshare ( 1 ) when hitting an obstacle (12, 12 ′ )) T) defined trigger angle (w) is also between 30 ° and 45 °, and
• that the angle of attack (a) of the ploughshare ( 1 ) with respect to the perpendicular (S) to the roadway ( 6 ) in the lower operating position of the ploughshare ( 1 ) is between 0 ° and 11 °.

2. Snow plow according to claim 1, characterized in that the trigger angle (w) is approximately 37.5 °. 3. Snow plow according to claim 1 or 2, characterized in that the Angle of attack (a) is approximately 5.5 °. 4. Snow plow according to one of claims 1 to 3, characterized in that the height (h) of the instantaneous pivot point (D) above the roadway ( 6 ) is less than 1.5 times, preferably approximately 1.35 times, the height (h ') Of the support frame side pivot point (P) of the lower link ( 7' ) over the road ( 6 ). 5. Snow plow according to one of claims 1 to 4, characterized in that the support frame ( 4 ) is supported both during normal clearing operation and when driving over obstacles by means of support skids ( 5 ) on the roadway ( 6 ).