Black Decker Inc.

Brian K Jackson

Horst Grossmann

A saw blade for a two-blade, contra-reciprocating saw has two strips spot welded together. Teeth are formed by scallops cut along an edge of each strip with lands between these scallops. Abrasive grit, such as tungsten carbide chips, is brazed on the teeth except on the sides of the teeth which rub against each other as the blades reciprocate. The main cutting surfaces are the lands which are longer on one strip than the other. The arrangement is useful for cutting masonry and metal products and reduces stresses on the blade.

Saw blades and method of making same

A saw blade comprises a support member having at least one edge, and, spaced along that edge, a series of slots in each of which is secured a saw tooth and in which a portion of the tooth is located within the slot and a further portion extends beyond the slot to overlie a portion of a surface of the support member. Part of the slot and a part of the tooth may be sector-shaped, each slot may include an entry portion with side edges and a base edge or edges, and the tip of the sector-shaped part is located centrally of the base edge, the sector-shaped part communicating with the entry portion via an opening in the base edge whose sides are rounded and which are a tight fit with a mating portion of a tooth, the remainder of a tooth fitting into the slot with some clearance. The invention also extends to a tooth for the saw blade, the tooth having a cutting portion and a body portion to locate in said slot. According to a further aspect of the invention, a cutting blade has hardened cutting teeth located in the slot in the blade, there being a support edge or edges spaced from the cutting edge of the blade and substantially parallel thereto which engages a support surface on a guide for the blade. The support edge(s) may be provided by a strip fixed to the blade or by edges on the teeth remote from their cutting portion which project beyond the surface of the blade.

Growing community of inventors

Newton Aycliffe, United Kingdom

Brian K Jackson