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

23

D

B23D 65/04 (2006.01) B27B 33/02 (2006.01)

Patent

CA 2189216

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 one or more cylindrically curved concave 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.

Dent de scie carrée à quatre bords tranchants, du type qui tourne autour de son axe sur un disque de scie pour présenter un nouveau bord tranchant quand le bord le plus à l'extérieur s'use, munie de plaques d'usure en carbure métallique qui recouvrent les régions à usure élevée de la face d'attaque et procurent des bords tranchants. Une plaque d'usure est placée à chaque coin de la face d'attaque, et chacune comporte une surface arrière plate pour fixation au corps de la dent et une surface avant de forme complexe, avec régions tabulaires aux coins, où les plaques sont plus épaisses, et une ou plusieurs surfaces concaves courbées en cylindre qui s'amenuisent des régions tabulaires vers l'intérieur de la face d'attaque, de façon à diminuer l'épaisseur de la plaque située à l'extérieur de la région tabulaire. Cette construction permet de répartir l'usure plus uniformément sur les surfaces et les bords de la face d'attaque pour un rendement plus efficace des plaques d'usure.

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