Slot starting sawing method and apparatus

• US 5,295,426 A
• Filed: 06/15/1992
• Issued: 03/22/1994
• Est. Priority Date: 06/15/1992
• Status: Expired due to Fees

• Current Assignee: Paul O. Planchon
• Original Assignee: Paul O. Planchon
• Inventors: Planchon, Paul O.
• Primary Examiner(s): Jones, Eugenia
• Assistant Examiner(s): SCHROCK, ALLAN
• Application Number:
  US07/898,478
• Time in Patent Office: 645 Days
• Field of Search: 83/835, 83/837, 83/846, 83/847, 83/848, 83/853, 83/13, 83/697, 83/851, 30/392, 30/503, 30/503.5, 30/353, 30/355, 30/356, 30/357, D 8/20, D 8/70
• US Class Current: 83/846
• CPC Class Codes: B23D 61/121 Types of set; Variable teeth, e.g. variable in height or gullet depth; Varying pitch; Details of gullet
• CPC Class Codes: B23D 61/128 Sabre saw blades
• CPC Class Codes: B26B 7/00 Hand knives with reciprocating motor-driven blades
• CPC Class Codes: Y10T 83/9346 Uniformly varying teeth or tooth spacing
• CPC Class Codes: Y10T 83/9362 Teeth having transversely curved cutting edge
• CPC Class Codes: Y10T 83/9454 Reciprocable type

Abstract

A method and apparatus for practicing the method by which a reciprocating saw may be utilized to cut within the edges of a panel of material without the necessity of providing a pilot hole or the like for the saw blade, wherein the saw blade is configured in such manner as to taper at the end not attached to the saw motor in order to come to a point and wherein a knife edge is supplied along the edges of said tapered portion of said saw blade, wherein the saw blade at its pointed and tapered end is allowed to cut through the panel of material being sawed with the sawing action commencing immediately after full penetration of the blade through the material.

Claims

1. A saw blade comprising:

an elongate member of suitable saw blade material having a width, length, thickness, a first leading edge, a second trailing edge, a first end and a second end;

said first end being provided with means to connect to a reciprocating mechanism;

said first leading edge having saw teeth extending from said second end to a first position adjacent the means to connect to a reciprocating mechanism, wherein said saw teeth are of uniform size from said first position to a second position intermediate the first position and the second end;

said saw teeth gradually diminish in size from said second position to the second end;

said second trailing edge being stepped so the width of the saw blade is decreased at a third position intermediate the first and second ends, said decreased width being continued to a fourth position intermediate the third position and the second end;

the width of the saw blade being tapered from the fourth position to the second end in such manner as to create a sharp point at the second end;

said second trailing edge being tapered to a knife edge along its length from the third position to the sharp point; and

the first leading edge and the saw teeth thereon being tapered to a knife edge from the second position to the sharp point.

2. The apparatus of claim 1 wherein the first leading edge from the second position to the sharp point is concave.

3. The apparatus of claim 2 wherein the second trailing edge is convex from the sharp point to a location intermediate the sharp point and the fourth position and concave from the location to the fourth position.