Cutting method and saw tool

• US 5,964,039 A
• Filed: 03/19/1996
• Issued: 10/12/1999
• Est. Priority Date: 07/28/1992
• Status: Expired due to Term

• Current Assignee: Panasonic Electric Works Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Works Ltd (Panasonic Holdings Corporation)
• Inventors: Okamura, Hidezumi, Hongo, Shoichi, Hatta, Hideo, Mizoguchi, Soichiro, Tatsu, Kunihiko
• Primary Examiner(s): Rachuba, M.
• Assistant Examiner(s): VAUGHN, T ANTHONY
• Application Number:
  US08/618,092
• Time in Patent Office: 1,302 Days
• Field of Search: 30/393, 30/392, 30/502, 30/516, 30/353, 30/357, 30/124, 30/374, 83/835, 83/820
• US Class Current: 30/392
• CPC Class Codes: B23D 49/165 with means to move the saw blades in an orbital path
• CPC Class Codes: B23D 51/10 for hand-held or hand-operated devices
• CPC Class Codes: B23D 59/006 for removing or collecting chips
• CPC Class Codes: B23D 61/006 Oscillating saw blades
• CPC Class Codes: B23D 61/126 having cutting teeth along both edges
• CPC Class Codes: Y10T 83/9319 Toothed blade or tooth therefor

Abstract

A saw tool comprises a housing for incorporating a driving device therein, a base attached to the housing, a driving arm connected to the driving device to effect a reciprocating orbital motion, and a saw blade attached to the driving arm and extending through a slit in the base. The saw blade has a first saw tooth section formed on a top end thereof for biting a workpiece and a second saw tooth section formed on one side thereof. A rectangular through-hole can be accurately and rapidly formed in a workpiece such as a plaster board or veneer board, etc., with this saw tool. That is, a cutting method of the present invention comprises the steps of biting the workpiece with the first saw tooth section of the saw blade in the reciprocating orbital motion, while pressing a top end of the base and the top end of the saw blade against the workpiece, penetrating the saw blade through the workpiece, and subsequently, cutting the workpiece with the second saw tooth section by moving the saw blade along a cutting line on the workpiece. As a result, a cutting operation of one side of the rectangular through-hole is finished. By repeating the above cutting operation to each side of the rectangular through-hole, the rectangular through-hole is formed in the workpiece without drilling a starting through-hole in the workpiece.

Claims

1. A saw tool for cutting a board workpiece having at least one planar surface with a saw blade having a reciprocating orbital stroke while moving a base of said saw tool along said planar surface of said workpiece, said saw tool comprising a housing containing an elongated grip having a longitudinal axis said base being fixedly attached to said housing and having a slit therein, drive means enclosed in said housing, except for said grip, and connected to a driving arm to effect a reciprocating orbital motion therein, and said saw blade having one end attached to said driving arm and its other end extending through said slit in said base, said grip on said housing being a solitary grip which extends at an acute angle with respect to said base such that said longitudinal axis of said grip intersects a forward end of said base, said saw blade being of a length to dispose said saw blade on a side of said base opposite that on which said driving arm is disposed during the entire orbital stroke thereof, said saw blade being defined by substantially parallel sides and an end portion connecting said sides at said other end, a first saw tooth section formed on said saw blade end portion and containing an edge of arcuate shape having saw teeth disposed thereon to establish a bite between said saw blade and said workpiece when said forward end of said base and said arcuate edge of said blade are pressed against said planar surface of said workpiece and said tool is moved to pivot said base about said forward end thereof, and a second saw tooth section being formed on one side of said blade and containing saw teeth particularly shaped to facilitate cutting of said workpiece when said saw tool is moved in one linear direction along said workpiece surface.

3. A saw tool as set forth in claim 1, wherein a third saw tooth section is formed on the opposite side of said blade from said second saw tooth section and contains saw teeth particularly shaped to facilitate cutting of said workpiece when said saw tool is moved in the opposite linear direction along said workpiece surface.

2. A saw tool for cutting a workpiece having at least one planar surface with a saw blade having a reciprocating orbital stroke while moving a base of said saw tool along said planar surface of said workpiece, said saw tool comprising a housing containing an elongated grip having a longitudinal axis and being fixedly attached to said base, said base having a slit therein, drive means enclosed in said housing except for said grip, and connected to a driving arm to effect a reciprocating orbital motion therein, and said saw blade having one end attached to said driving arm and its other end extending through said slit in said base, said grip on said housing being a solitary grip which extends at an acute angle with respect to said base such that said longitudinal axis of said grip intersects a forward end of said base, said saw blade being of a length to dispose said saw blade on a side of said base opposite that on which said driving arm is disposed during the entire orbital stroke thereof, said saw blade being defined by substantially parallel sides and an end portion connecting said sides at said other end, a first saw tooth section being formed on said end portion and containing a linear edge inclined against said one side of said saw blade to establish a bit between said saw blade and said workpiece when said forward end of said base and said linear edge of said blade are pressed against said workpiece and said tool is moved to pivot said base about said forward end thereof, and a second saw tooth section being formed on said one side of said blade and containing saw teeth particularly shaped to facilitate cutting of said workpiece when said saw tool is moved in one linear direction along said workpiece surface.

4. A saw tool as set forth in claim 2, wherein a third saw tooth section is formed on the opposite side of said blade from said second saw tooth section and contains saw teeth particularly shaped to facilitate cutting of said workpiece when said saw tool is moved in the opposite linear direction along said workpiece surface.