Mcpherson's Limited

Cvetan Petroff

Christopher Collins

Wallace Tench

Alfred Blochlinger

Frank L Winyard

Gordon Bremner

Gordon Bremmer

David Watson

A blade sharpener having a sharpening mechanism which functions to sharpen a blade engaging that mechanism and being moved longitudinally relative thereto. The sharpener also includes sharpening defeating means which, when operative, at least inhibits and possibly prevents sharpening of a blade by the sharpening mechanism when that blade is moved longitudinally through the sharpener in one direction. The defeating means is responsive to blade movement so as to adopt an operative condition when the blade is moved in the aforementioned one direction, and to adopt an inoperative condition when the blade is moved through the sharpener in the opposite direction. The defeating means includes a blade engaging member such as a roller, and in the operative condition that roller engages and presses against the cutting edge of the blade so as to impose a force on the blade which acts counter to the force causing the blade to engage the sharpening mechanism. The counter force therefore tends to push the blade out of contact with the sharpening mechanism. The roller does not engage the blade, or at least does not apply the counter force, when the defeating means is in the inoperative condition. An anti-bottoming groove is provided around the circumferential surface of the roller to provide a location for the cutting edge of the knife blade and that groove is formed to avoid contact between the actual cutting edge of the blade and the base of the groove.

Blade sharpener

Retractable blade knife

Utility knife or similar article

Knife scabbard

A retractable blade knife having a self-sharpening facility which can be selectively rendered inoperable. The sharpener is spring biased in an upward direction so as to be urged into engagement with the cutting edge of a knife blade, and manually operable release means is provided to permit the sharpener to be held in an inoperable position. An assembly of which the sharpener forms part also functions as stop means which positively prevents movement of the knife blade into its extended position. Such extension is possible only upon operation of the release means, but that is only necessary during initial outward movement of the knife blade. The sharpener is arranged to sharpen the cutting edge of the blade up to the tip of the blade. Positive locking means is provided to prevent inward movement of the blade when working under load in the extended position.

A scissors sharpener including a pair of elongate sharpening elements relatively arranged so as to define a vee shaped sharpening recess between them. Each sharpening element forms a respective one of two sides of the recess and each side has a longitudinal extent which is no less than the length of the scissor cutting edges to be sharpened. At least one of the sharpening elements is mounted so as to be movable laterally away from the other element, and resilient means bears against the movable element so as to resist the aforementioned movement. The sharpening elements overlie a base plate and an extension of that plate forms a platform against which the handle portion of scissors can rest during the sharpening operation. In use, scissors are located on the sharpener with the closed blades over the recess and the cutting edges extending generally in the longitudinal direction of the recess sides. Sharpening is effected by moving the closed blades sidwards through the recess towards the underlying base plate so that each cutting edge engages and is treated by a respective sharpening element during that movement.

Scissors sharpener

Knife handle or similar article

Knife scabbard or similar article

Cutlery scabbard or similar article

A blade sharpener having an access opening through which a blade is moved to be sharpened and including a sharpening device which engages with and sharpens the blade cutting edge and a reaction member which engages with and applies downward pressure to the blade back edge. The reaction member has an upper portion which is pivotally mounted adjacent an upper extremity of the access opening and at a location forward of the sharpening device. A lower portion of the reaction member is engageable with a knife blade. The sharpening device is mounted adjacent the lower extremity of the access opening. A spring urges the reaction member into a rest position at which the lower portion of that member is located forward of the sharpening device and rearward of the pivotal mounting of the reaction member. The arrangement is such that a blade being moved into the sharpener engages the reaction member before engaging the sharpening device and pushes that member away from the rest position so that its lower portion moves over and rearwardly beyond the sharpening device. The sharpener is adapted for removable location within the open mouth of a blade protecting scabbard.

Knife sharpener

Growing community of inventors

Northcote, Australia

Cvetan Petroff