Hacksaw blade with bi-directional teeth

• US 5,062,338 A
• Filed: 03/13/1990
• Issued: 11/05/1991
• Est. Priority Date: 03/13/1990
• Status: Expired due to Fees

• Current Assignee: Slade H. Baker
• Original Assignee: Slade H. Baker
• Inventors: Baker, Slade H.
• Primary Examiner(s): Yost, Frank T.
• Assistant Examiner(s): Schrock, Allen M.
• Application Number:
  US07/492,834
• Time in Patent Office: 602 Days
• Field of Search: 83/835, 83/837, 83/846-855
• US Class Current: 83/848
• 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 61/125 Composite body, e.g. laminated, body of diverse material
• CPC Class Codes: Y10T 83/9319 Toothed blade or tooth therefor
• CPC Class Codes: Y10T 83/935 Plural tooth groups
• CPC Class Codes: Y10T 83/9353 Including raker tooth group

Abstract

The present invention includes a bi-directional hacksaw blade that bites into and saws an object and clears particulate from a cut being formed in the object in each of the forward and rearward sawing directions. Each of the blade embodiments disclosed include a blade with two sets of teeth. The teeth of the first set is a mirror image of the teeth of the second set so that one set saws the object and the other set clears particulate in one sawing direction. In the opposite sawing direction, the roles of the teeth are reversed.

Claims

1. A hacksaw blade for being mounted on a hacksaw for sawing an object, the blade producing a cut and particulate matter when sawing the object, the blade comprising

a blade with two ends, first and second edges, and opposing faces, the blade further having an axis disposed equidistant from the first and second edges and extending between the ends, the blade further having a pair of apertures for connecting the blade to the hacksaw, each of the apertures adjacent one of the ends

a first set of teeth being disposed on the first and second edges of the blade to saw the object in one sawing direction from one of the ends to the other end of the blade, each of the teeth of the first set having a linear clearing edge disposed at an acute angle relative the axis, each of the teeth of the first set further having an elliptic cutting edge, each of the liner clearing edges and each of the respective elliptic edges forming a tip, and

a second set of teeth being disposed on the first and second edges to saw the object in an opposite sawing direction, each of the teeth of the second set being a mirror image of each of the teeth of the first set on their respective edges and having corresponding linear clearing edges, elliptic cutting edges, and tips, each of the teeth of the first set being arranged in an alternating fashion with each of the teeth of the second set, each of the linear clearing edges of the first set of teeth being adjacent to and leading into one of the linear clearing edges of the second set and forming the shape of a V, the elliptic cutting edges of the first set leading into the elliptic cutting edges of the second set and forming essentially the shape of half of an ellipse, the tips of the first set extending outwardly relative to one of the faces of one of the blade and the tips of the second set extending outwardly relative to the other face of the blade so that the tips are staggered relative to each other, each of the adjacent linear edges which form the shape of a V being linear relative to each other to be disposed substantially in the same plane and lying obliquely relative to the blade whereby each of the first and second blade edges saws the object and clears particulate in both of the sawing directions.

2. A hacksaw blade for being mounted on a hacksaw for sawing an object, the blade having teeth that bite into an saw the object when the hacksaw is manipulated in both of the forward and rearward sawing directions, the blade producing a cut and particulate matter when sawing the object, the blade comprising

a pair of first and second blades, each of the blades having front and rear ends, first and second edges, and opposing faces, each of the blades further having an axis disposed equidistant from the first and second edges and extending between the front and rear ends, the blades being rigidly affixed to each other so that the first and second edges are aligned, so that one of the faces of one of the blades confronts and bears upon one of the faces of the other blade, and so that the front end of one of the blades is disposed adjacent the rear end of the other blade, each of the blades having a pair of apertures for connecting the blade to the hacksaw, each of the apertures adjacent to one of the ends, each of the apertures being aligned with one of the apertures of the other blade when the blades are rigidly affixed to each other, and

a set of teeth being disposed on the first edges of each of the blades, each of the teeth having a linear clearing edge disposed at an acute angle relative to the axis,

each of the teeth further having a cutting edge disposed substantially normal relative to the axis, each of the linear clearing edges of one of the blade crossing one of the linear clearing edges of the other blade so as to form an X, each of the linear clearing edges forming a tip, each of the tips of one of the blades being aligned with one of the tips of the other blade whereby one of the blades bites into and saws the object in the forward sawing direction and clears particulate from the cut in the rearward sawing direction and the other blade bites into and saws the object in the rearward sawing direction and clears particulate from the cut in the forward sawing direction.