Excavating – Digging edge
Patent
1995-07-07
1998-04-28
Reese, Randolph A.
Excavating
Digging edge
37232, 37233, 1727013, E02F 336, E01H 504
Patent
active
057430322
DESCRIPTION:
BRIEF SUMMARY
The object of this invention is a plough blade arrangement, advantageously in a snow-plough, which plough is intended to be attached to a vehicle, advantageously a tractor or lorry, the plough blade arrangement including a frame consisting of a flat part removably attached to the plough, a blade plate, and attachment devices for securing the blade plate to the frame. The plough blade arrangement in accordance with the invention is used especially in connection with the ploughing of asphalt-surfaced highways, when the intention is to clean the asphalt surface.
There is a previously known use in ploughs of various vertically and horizontally stiff blades attached to the plough, when the wear caused by friction is not directed onto the plough itself, but onto a separate, changeable blade component manufactured from, for example, steel, hard metal, or similar. These blade components are typically plate-like irons 300 mm high and 8 mm thick, the width of which varies with the width of the plough, in such a way that several blades can be attached next to the plough next to one another. During ploughing, the angle between the blade and the road is generally about 55.degree.-70.degree., when the lower edge of the blade is further forward than the upper in the direction of travel. The blade then presses against the road with a force corresponding to about 1000 kg. The greatest problem with known blades used in ploughing is their rapid wear, which is considerably promoted by unevennesses in the road. 0n the basis of experience is has been demonstrated that even a plough blade of hard metal will wear very rapidly, especially if there are many unevennesses in the road being ploughed. In addition to this, the road surface too wears. The wear is due above all to the fact that when the stiff plough blade hits an unevenness in the road, and the plough blade is pressed down with a force corresponding to 1000 kg, then either the plough blade or the road surface will be damaged before the plough has been raised sufficiently to clear the unevenness. In addition, the surface left by stiff blades is unsatisfactory, especially on a rutted road, on account of which use is also made of ploughs, in which there is, for example, a plough in front equipped with a large, stiff, steel blade, and behind it a small plough equipped with a small rubber blade for final cleaning.
The intention of this invention is to create a plough blade arrangement, by means of which the ploughed surface is better, and in which unevennesses in the road cause considerably less wear compared to known blades, and which correspondingly wears the road being ploughed less than known plough blades. These goals are achieved by means of a plough blade arrangement in accordance with the invention, the characteristic features of which are presented in the accompanying Patent claims.
The invention is based on the idea that the blade component in contact with the road is flexibly attached to the plough, in which case the blade component flexes upwards when it strikes an unevenness in the road. The most significant advantage of the invention is thus that the blade component of the plough, and the road being ploughed wear significantly less than when using known plough blade arrangements. In addition, when using a plough blade arrangement in accordance with the invention, there is the advantage that when the plough strikes an unevenness in the road extending over only part of the width of the plough the blade component does not rise over its entire width, but only at the point of the unevenness and/or from the angle on the side of the unevenness, when the blade component of the plough and the road surface are momentarily at a certain angle to one another. A significantly better cleaning result is achieved, especially on rutted roads, by means of a plough blade arrangement in accordance with the invention, in which separate components are used that yield to the surface of the road.
A plough blade in accordance with the invention is described in what follows with the aid of
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Beach Thomas A.
Reese Randolph A.
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