FI62261B - LED VID BANDELEMENT - Google Patents

Description

I- - ».-" -. I r. .... NOTICE OF PUBLICATION ΑΟΟΑΛ

(11) UTLÄOCNINOSSKKIFT

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Patant · och registerItyralMd AraMcan utlagd och utl.akriftM publkurmd 31.0o.o2 (32) (33) (31) tyr <l «ttr ttuoMmi» · li | lnl prior * · * (71) Piippo Oy, 37500 Lempäälä, Finland Finland (Fl) (72) Pertti Penttilä, Tampere · ,. FIELD OF THE INVENTION through the fingers, the end face of the fingers on the other edge of the element having a cam extending past the bottom surface of the recesses at the corresponding point of the adjacent element and pressing against the outer surface of the edge region of the recesses, preventing the roll mat from bending inwardly in the direction of the traction wheels.

For example, track tracks for snowmobiles are already known, in which the mat can bend both inwards and outwards at the hinge. The strong acceleration of the vehicle then causes the front traction wheel to push back more of the track than the rear deflection wheel receives, so that the lower part of the track on the snow or other platform is in a zigzag shape when viewed from the side. Since such a shape breaks the snow clumps formed according to the patterns of the mat, the adhesion between the track and the snow is impaired.

2 62261 This drawback has been largely eliminated in the track according to Swedish patent 382 027, in which the end surfaces of the fingers and the bottom surfaces of the recesses form a butt joint, as a result of which the track does not bend at hinge pins but is made of flexible material. However, practice has shown that such a mat will prematurely crack and crack under cold conditions because there is no sufficiently flexible material to meet the other requirements for a trackless material. Finnish patent publication 48 815 discloses a roll mat with side flanges at the edges of the elements, the function of which is to stiffen the mat at the turning rollers so that the roll elements do not go obliquely to the turning roll and so that "bagging" occurs. The function of these side flanges is thus to make the track substantially rigid in the case of the turning rollers.

It is an object of the present invention to provide a track element which keeps the lower part of the track against the substrate rigid and straight, even under high acceleration, and which nevertheless allows the mat to bend at the hinges without undue stresses on the element itself. The invention is characterized in that the cam extends so far inwards that when it rests against the outer surface of an adjacent element without compressive force, the main planes of the elements are at an angle (Oi) to each other of about 5 ° -15 °, preferably about 8 °.

Because the track is slightly outwardly bent at its hinges in its free space, it must be compressed somewhat or pressed outwards to settle directly into the space. When the part of the track weight against the chassis settles directly into the space, it thus has a certain prestress at the hinges, which tends to bend the mat outwards. This prestressing ensures that the mat does not bend inwards and that a good, firm grip is created between the mat and the substrate.

In order to provide sufficient but at the same time flexible prestressing, the cam is preferably undercut.

The invention will now be described in more detail with reference to the accompanying drawing, in which Figure 1 shows one track element as a plan view, Figure 2 shows the hinge at point A in Figure 1 as a plan view and on a larger scale, Figure 3 shows a section along line III-III in Figure 2 shows a smooth section as in Fig. 3 with the track in the prestressed state.

Figure 1 shows, for example, the outer side of a track element 1 made of plastic, with a pattern to improve adhesion. The element is fastened at both longitudinal edges to the adjacent elements IA by means of pins inserted through holes 3 in the fingers 2. The ends of the fingers have a thickening to provide sufficient strength at the pin hinge. Between the fingers there are recesses 4 with a bottom surface 5 perpendicular to the plane of the element. According to the invention, the end face of the fingers 2 at the top of the element shown in Fig. 1 has a cam 6, Figures 3 and 4 extends over an adjacent element. The cam is positioned on the finger so that it is located on the outer side of the edge area of the recess 4, i.e. on the side facing away from the folding wheels of the vehicle support. According to Figures 3 and 4, the cam is undercut so that its tip is directed towards the outer surface of the second element. The length of the cam, the thickness of the second element and the center of the pin are arranged relative to each other so that when the mat is in the free state, the two adjacent elements are at an angle of about 5-15 °, preferably about 8 ° to each other. The mat is thus bent outwards at the hinge.

In use, however, the lower part of the mat against the base is straightened by the weight of the vehicle, whereby the cam 6 is compressed outwards (in Fig. 4 upwards). In the straight state of the mat, the prestress thus obtained prevents the mat from bending inwards and it also allows a firm adhesion to the substrate.