Saw blade for a saw having reciprocating blades

US4798001A · kind A · utility

Assignee

• BLACK & DECKER INC. · US

Inventors

• Horst Grossmann · Brechen, DE
• Ernst Staas · Limburg, DE

Key dates

• Filing date: Oct 30, 1987
• Grant date: Jan 17, 1989
• Expiry date: Oct 30, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T83/935
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A saw blade, for a power saw having two such blades arranged adjacent and parallel to each other and reciprocating in opposite directions, comprises an elongate blade member having teeth along a bottom edge. The teeth comprise at least three types, a first type being at an outer surface of the blade member, a third type being at the inner surface, and the second type being therebetween. The first type are shaped to produce on the blade's bottom edge an outward force away from the inner surface while cutting a workpiece, and the second and third types are shaped to produce on the blade's bottom edge an inward force, the resultant force on the teeth while cutting urging the teeth in an inward direction away from the outer surface towards the inner surface. When the power saw is operating with a pair of these blades, the blades are urged together at their teeth by the cutting action so effectively eliminating penetration of sawdust and cuttings between the pair of blades. Advantageously the saw blades can be very thin-walled, e.g. 1mm to 2mm thick.