Saw tooth attack face and edge structure

Details Saw tooth attack face and edge structure Saw tooth attack face and edge structure

B - Operations, Transporting

27

B

B27B 5/29 (2006.01)

Patent

CA 2151306

A square saw tooth having four cutting edges of the type which is rotatable about its axis on a saw disc to present a fresh cutting edge when the radially outermost edge wears out has carbide wear plates covering the high wear areas of its attack face and providing its cutting edges. A wear plate is provided at each corner of the attack face, and each wear plate has a flat rear surface for attachment to the tooth body and a front surface of a complex shape, having plateau surface areas at the corners, where the plates are thicker, and curved surfaces which recede from the plateau areas toward the interior of the attack face, so that the plate recedes in thickness away from the plateau area. This construction helps provide more uniform wear over the surfaces and edges of the attack face for a more efficient consumption of the wear plates. In an alternate embodiment, the plateaus are provided at the corners of a tooth having a spherically concave attack face so as to inhibit wear of the corners.

Dent de scie carrée présentant quatre bords tranchants, pivotant sur son axe, et montée sur un disque de scie de manière à présenter un tranchant aiguisé lorsque le bord tranchant le plus éloigné du centre est émoussé. La dent est dotée de plaques d'usure au carbure couvrant les zones de grande usure de sa face d'attaque et constituant ses bords tranchants. Une plaque d'usure prévue à chaque coin de la face d'attaque présente une surface arrière plane se fixant au corps portant les dents et une surface avant de forme complexe et des zones planes formant les coins, où les plaques sont plus épaisses et où les surfaces courbes s'atténuent à partir des zones planes vers l'intérieur de la face d'attaque, de sorte que la plaque est moins épaisse en direction opposée à la zone plane. Cette construction permet une usure plus uniforme des surfaces et des bords de la face d'attaque afin d'assurer une utilisation plus efficace des plaques d'usure. Dans une autre application, des zones planes forment les zones de coin d'une dent présentant une face d'attaque à concavité sphérique, ce qui ralentit l'usure des coins.

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