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US 7,540,091 B2Granted
Extended life cutting blades for hand-held cutting tools
AssigneeShear Tech, Inc.
InventorsLloyd E. Fladgard, Scott C. Fladgard
Life of this patent
Estimating the term…
Abstract
An extended-life cutting blade is adapted for mounting on a hand-held cutting tool in multiple operative orientations. A single cutting blade may provide up to four independent shear edges, each of which has a useful life. The blade can be easily changed from an orientation adapted to cut a workpiece with one shear edge to a different operative orientation adapted to cut with a different shear edge by selecting an appropriate mount on the blade.
Claims14
A method of reconfiguring a cutting head for a hand-held cutting tool, the method comprising:
- providing a cutting head having a casing configured to carry first and second blades and a reciprocating cutting member which reciprocates between the first and second blades about a rotation axis located at least approximately at a midsection of the first and second blades, the individual first and second cutting blades including a body having spaced-apart first and second shear edges, a first mount mating with the casing, and a second mount configured to mate with the casing, the individual first and second shear edges including a first section and a second section different than the first section, the first section of the first shear edge being positioned forward of the rotation axis at a cutting zone adjacent to the reciprocating cutting member for cooperation therewith and shearing a workpiece, the second sections of the first and second shear edges being positioned aft of the rotation axis and aft the cutting zone;
- detaching the first mount of the first blade from the casing;
- turning the body of the first blade;
- and
- attaching the second mount of the first blade to the casing to attach the first blade to the casing, wherein the second section of the second shear edge of the first blade is positioned forward of the rotation axis and in the cutting zone adjacent to the reciprocating cutting member for shearing the workpiece and the first sections of the first and second second shear edges of the first blade are positioned aft of the rotation axis and aft of the cutting zone.
2 more elements
A method of reconfiguring a cutting head for a hand-held cutting tool, the method comprising:
- providing a cutting head having a casing configured to carry first and second blades and a reciprocating cutting member which reciprocates between the first and second blades about a rotation axis located at least aporoximately at a midsection of the first and second blades, the individual first and second cutting blades including a body having spaced-apart first and second shear faces and a hole extending between the first and second shear faces, the first shear face having a first shear edge and the second shear face having a second shear edge, the individual first and second shear edges including a first section and a second section different than the first section, the first section of the first shear edge being positioned forward of the rotation axis in a cutting zone adjacent to the reciprocating cutting member for cooperation therewith and shearing a workpiece, and the second sections of the first and second shear edges being positioned aft of the rotation axis and aft of the cutting zone;
- and
- detaching the first blade from the casing by removing a first mounting member from the hole;
- and
- reattaching the first blade to the casing by placing a second mounting member in the hole, wherein the first blade is positioned with the second section of the second shear edge forward of the rotation axis and in the cutting zone adjacent to the reciprocating cutting member for cooperation therewith and shearing the workpiece, and with the first sections of the first and second shear edges of the first blade being positioned aft of the rotation axis and aft of the cutting zone.
2 more elements
Dependencies are inferred from the claim text.