SPIRAL BAND SAW

• US 3,621,894 A
• Filed: 10/30/1969
• Issued: 11/23/1971
• Est. Priority Date: 10/30/1969
• Status: Expired due to Term

• Current Assignee: Eugene J. Niksich
• Original Assignee: Eugene J. Niksich
• Inventors: Niksich, Eugene J.
• Primary Examiner(s): Schran, Donald R.
• Application Number:
  US04/872,526
• Time in Patent Office: 754 Days
• Field of Search: 143/19,19E,17,21,21A,21B,133D 83/201
• US Class Current: 30/380
• CPC Class Codes: B23D 57/0007 using saw wires
• CPC Class Codes: B23D 57/0015 hand-held or hand-operated
• CPC Class Codes: B23D 57/0053 of drives for saw wires; of wheel mountings; of wheels
• CPC Class Codes: Y10T 83/7264 With special blade guide means

Abstract

A spiral blade saw which may be used as a hand or bench model and comprising drive means for carrying the blade wherein all turns of the path of movement of the blade are at least at a predetermined minimum turning radius.

Claims

1. A spiral blade saw comprising:

a housing having body and mouth sections with said mouth section located within the path of movement of the blade;

a spiral blade in the form of an endless wire having cutting edges positioned on all sides, an endless drive belt for carrying the blade, said drive belt formed with a plurality of equally spaced notched teeth which engage the blade, said drive belt also engaging a rotary driving means for moving the belt; and

a guide plate mounted adjacent to the periphery of the housing for slidably supporting the drive belt and the blade.

2. A spiral blade saw according to claim 1 wherein the rotary driving means includes a power wheel having teeth on its periphery which engage the teeth on the drive belt.

3. A spiral blade saw according to claim 1 wherein said guide plate has a generally circular shape with a radius of curvature having a predetermined minimum value.

4. A spiral blade saw according to claim 3 wherein the radius of curvature of the guide plate is greater than 7 inches.

5. A spiral blade saw according to claim 1 wherein said mouth section is positioned so that a work piece can be moved against the blade and into the mouth section.

6. A spiral blade saw according to claim 1 wherein said drive belt is mechanically engaged by the guide plate, the driving means, and two guide wheels to separate from the blade at one of the edges of the mouth, directed around the mouth section, and then engaged with the blade at the other end of the mouth section.

7. A spiral blade saw according to claim 1 wherein an opening is formed in said housing to act as a handle to be grasped by an operator.

8. A spiral blade saw according to claim 1 wherein said driving means comprises an electric motor for moving the belt, and a manually operated electric switch attached to said housing.

9. A spiral blade saw according to claim 6 wherein said two guide wheels are adjustable for altering the tension on the drive belt and the blade.