SU253342A1 - CHAIN SAW - Google Patents

Description

The invention relates to equipment used in the forest industry, and more specifically, for felling and cutting logs.

Known chain saws with hingedly cutting, cutting, and cleaving teeth.

In known saws, the contouring back angle of the cutting, undercutting and chipping teeth, as well as the angle of inclination of its lateral rear face, are of a constant value. So the back angle is 9 °. This leads to the fact that it is impossible to get a smooth rezann especially in the winter period when processing solidified wood. It creates a great force of engine power and a strong shudder of the teeth of the nns, which causes danger in the process of work.

The aim of the invention is to create a valuable nile, which allows to improve the quality and cutting conditions of winter hardened wood.

To do this, use a known chain saw with pivotally hardened cutting, undercutting and shearing teeth, in which the cutting, cutting and cleaving teeth are made with a contour back angle a 1-8 ° 40 and with an angle of inclination of the lateral rear face 70-80 °, 80- 85 ° and 90-85 °, respectively, as indicated above, teeth m,

the height of the pruning and shearing teeth is reduced from 0.3 to 1.5 mm compared with the cutting teeth.

 FIG. 1 shows a schematic of a chain nila, side view; in fig. 2 - the same, end view; in fig. 3 - inclined lateral posterior facet of the angle of the cutting tooth; in fig. 4 - nakloin side rear edge of the corner of the cutting tooth; in fig. 5 - inclined lateral posterior face of the angle of the splitting tooth.

The described chain saw is intended for non-pointed splicing with a shank of 15 mm. It consists of cutting I, undercutting 2 and cleaving teeth o, pivotally interconnected.

Teeth L 2 and 3 are made with contour rear angles, cci, aa, az and tilt angles lii, 152, fz of lateral rear faces 4, 5 and 6.

On the table, the values of the contour rear angles “1,, hell of the teeth and angles i |: i, i |} 2, g | 1z are the slopes of the side rear edges.

FIG. 1, depicting a chain saw, contour rear angles txi, az, 0.3, respectively (; cutting /, cutting 2 and cutting 3 teeth down from 9 to 7 ° 30 compared to known chain saws, which allows smooth cutting. In FIG. 3, depicting an inclined lateral rear edge 4 of the angle d) :, the angle xjji is increased from 54 to 80 °. FIG. 4, depicting an oblique

side face 5 of the angle r |, 2, the angle f reduced from 80 to 65 °. FIG. 5, depicting an inclined lateral rear face 6 of the angle fz, the angle fz is reduced from 90 to 85 °.

It is intended to select the lateral posterior face 6 of the angle 3 of the cutting teeth in a checkerboard pattern (see Fig. 5). Nanrimer, when treating hard wood, the first chipping tooth at an angle of 90 °, then two teeth at an angle of 85 °, etc. In addition, the height of the cutting and chipping teeth was reduced by 0.3-1 compared to the cutting teeth 7, 5 mm.

All this contributes to better chipping of notched wood fibers by iodizing 2 and cutting / saw teeth and no-wall incision of each tooth into wood, which ensures straight cuts and increases the cutting speed of wood.

Subject invention

Chain saw, including hingedly fortified teeth cutting, undercutting and scaling teeth on it, characterized in that, in order to improve the cutting conditions of the hardened timber, the cutting, cutting and cleaving teeth of the nila are performed with a contoured rear angle a equal to 7 to 8 ° 40, and with the angle of inclination of the lateral posterior face of 70-80 °, 80-85 ° and 90-85 °, respectively, above the teeth m, and the height of the undercutting and shearing teeth is reduced by 0.3–1 compared to rel. 5 mm.

Horn./

Aa

-Jl