Edge sharpening apparatus
OwnerJohn Juranitchinventor
Life of this patent
Estimating the term…
Abstract
A device for sharpening a cutting edge including a base an elongated slot that is dimensioned to permit free passage of a cutting blade therealong. At least one sharpening element is pivotally secured to the base near its upper end and extends across the slot at a predetermined angle. Preferably, two such sharpening elements are employed, intersecting at the slot so that a cutting edge moved along the slot will be sharpened on both sides during a single pass through the slot. The sharpening elements may be straight or curved and are always under a predetermined tension. This tension may be applied by either springs or counterweights.
Claims18
Apparatus for providing a sharpened cutting edge on an elongated cutting tool comprising:
- (a) a base, said base defining at least one elongated slot therein, said base including at least one support located adjacent said slot, said support defining a first upper ledge at a predetermined angle with respect to said slot;
- (b) an elongated straight sharpening element residing atop said angular ledge and extending downwardly across said slot;
- (c) means associated with said base and an upper end of said sharpening element to apply a predetermined pressure only on said sharpening element;
- and
- (d) stop means secured to said base on an opposite side of said slot to said support, a portion of said sharpening element freely engaging an underside of said stop, so that a cutting tool being moved along said slot with the edge of same in contact with said sharpening element will be sharpened by said sharpening element with said sharpening element pivoting downwardly about said ledge when pressure of said edge thereagainst exceeds said predetermined pressure to avoid excess pressure of said edge against said element.
Apparatus for providing a sharpened cutting edge on an elongated cutting tool, comprising:
- (a) a base having an elongated slot therein;
- (b) a pair of elongated sharpening elements, each of which is pivotally secured to said base adjacent one end of said slot at a pivot point adjacent the upper end of said elements, each of said elements having a curved portion on one side of said pivot point which curves downwardly;
- and
- (c) counterweight means disposed on the other end of each of said sharpening elements having a weight which is in excess of the weight of said curved portion and which applies a predetermined downward force on the other end of said elements to cause each of said elements to pivot about its pivot and across said slot, said elements intersecting with each other where they cross said slot so as to provide contact sharpening surfaces to each side of the cutting edge of said elongated cutting tool passing through said slot.
Apparatus for providing a sharpened cutting edge on an elongated cutting tool, comprising:
- (a) a non-metallic base having an elongated slot therein;
- (b) a first pair of elongated sharpening elements, each of which is pivotally secured to one side of said base adjacent to one end of said slot, on one side of said slot and has one end which extends downwardly;
- (c) means connected to the other end of each of said first pair of elongated sharpening elements to apply a predetermined downward force to the other end of said elements to cause said elements to pivot about their pivots and across said slot, said elements also intersecting with each other so as to provide contact sharpening surfaces to each side of the cutting edge of an elongated cutting tool passing through said slot;
- and
- (d) a second pair of sharpening elements disposed on the reverse side of said base, which have curved surfaces which extend over a portion of said elongated slot into abutting contact with each other.
Dependencies are inferred from the claim text.