Apparatus for precision steeling/conditioning of knife edges
View Patent ↗A knife edge enhancing apparatus includes a support having a support surface and knife blade clamping structure mounted to the support and located above the support surface. An object having a knife edge modifying surface which could be abrasive or non-abrasive is mounted to a holder which is freely slidable on the support surface so that the object surface can be manually moved into contact with a knife edge facet. At least one of the clamping structure and the object surface is angularly adjustable to control the angle of contact of the object surface with the knife edge facet.
1. An apparatus for manually sharpening the edge of a knife blade with two faces each of which terminates in an edge facet which meet to form said edge, said apparatus comprising:
an elongated sharpening member having a hardened surface defining a longitudinal axis;
a knife guide having a guide surface disposed at a non-parallel acute angle to said longitudinal axis of said sharpening member whereby a face of said knife blade may be placed on said guide surface to enable an edge facet of said face to be held in sustained contact with said hardened surface while said face is drawn manually along said guide surface in a transverse direction nominally perpendicular to said longitudinal axis of said sharpening member,
said knife guide being movably coupled to said elongated sharpening member to permit sliding movement in first and second opposing directions extending generally parallel to said longitudinal axis of said sharpening member; and
a spring mechanism coupled to said knife guide,
said spring mechanism reacting against said knife guide to force said knife guide in said first direction to an upper rest position, and
said spring mechanism permitting said knife guide to be displaced from said rest position in said second direction as the user applies a downward force on said knife blade as said face is held in contact with said guide surface and said edge facet is held in sustained contact with said hardened surface.
2. The apparatus of claim 1 , wherein said knife guide further comprises a knife holding spring mechanism coupled to said knife guide;
wherein at least a portion of said knife holding spring mechanism conforms closely to the geometry of the guide surface of said knife guide to define a slot in the absence of said knife blade; and
wherein insertion of said knife blade in said slot forces contact of a face of said knife blade with the guide surface.
3. The apparatus of claim 1 , wherein said knife guide is removable and replaceable with a second knife guide having a guide surface disposed at a non-parallel acute angle to said longitudinal axis of said sharpening member, wherein said non-parallel acute angle is distinct from the non-parallel acute angle of said knife guide.
4. A method for sharpening the blade of a knife, comprising sliding the blade in a first direction through a knife guide and against a hardened surface while simultaneously moving the knife guide and the blade in a second direction, perpendicular to the first direction, relative to the hardened surface from a first, rest position to a second position spaced from the rest position, and providing a spring mechanism reacting against the knife guide in a third direction, opposite the second direction, wherein after the knife guide is moved to the second position, allowing the spring mechanism to move the knife guide from the second position back to the rest position.