Apparatus and method for sharpening tool blades
OwnerGeoffrey Evansinventor
Life of this patent
Estimating the term…
Abstract
A sharpening device for the blade of a tool such as a chisel or plane is in two parts. The first is a jig into which the blade is inserted with its tapered end projecting some distance beyond the jig. This distance is related to the angle to which the blade is to be sharpened. The second part is a marked reference member which is brought into a position alongside the jig. The blade is advanced through the jig until its tip reaches a marking on the reference member corresponding to the required sharpening angle for the tool. The tool is then clamped in the jig. The jig incorporates a roller which rolls on the sharpening stone while the tapered tip of the blade is sharpened by contact with the stone.
Claims18
1-37. (canceled)
A method of preparing a tool blade for sharpening a tip thereof to a desired angle, comprising:
- attaching the tool blade to a jig such that a length of the blade extends beyond the jig and such that the tip is positioned at an extremity of the blade, whereby the angle formed between a plane of the blade and a straight line extending from the tip to a tangential point on the jig is the angle to which the tip is to be sharpened;
- attaching to a worktop a reference member bearing a plurality of graduated markings for measuring the length of the blade extending beyond the jig;
- removably securing the jig to the reference member such that the distance between the jig and each marking is predetermined.
A device for holding and positioning a tipped tool blade for sharpening the tip on a sharpening stone at a sharpening angle, the device comprising:
- a jig to hold the blade during sharpening;
- and
- a reference member to facilitate initial positioning of the blade relative to the jig when the jig and the reference member are positioned relative to each other in a registration position, the reference member having a projecting lug adapted to engage the jig;
- wherein the jig and the reference member include mating pins and holes defined on a surface of the lug and on a juxtaposed portion of the jig which engages the lug.
A device for holding and positioning a tipped tool blade for sharpening the tip on a sharpening stone at a sharpening angle, the device comprising:
- a jig to hold the blade during sharpening;
- and
- a reference member to facilitate initial positioning of the blade relative to the jig:
- wherein, the jig comprises a clamp adapted to hold the blade, the clamp including a pressure plate having a convex surface adapted to engage the blade.
A device for holding and positioning a tipped tool blade for sharpening the tip on a sharpening stone at a sharpening angle, the device comprising:
- a jig to hold the blade during sharpening;
- and
- a reference member to facilitate initial positioning of the blade relative to the jig, the reference member including first and second parallel surfaces wherein, a batten is attached to a surface, the batten being configured to be gripped in a vice.
Dependencies are inferred from the claim text.