Abstract: The portable band saw sharpener includes a frame for receiving a saw blade that is to be sharpened. A hand-operated motor is pivotally mounted to the frame for driving a grinding wheel, which engages the teeth of the saw blade. A hand-operated structure releasably holds the saw blade in place during the sharpening of the saw teeth, and the motor is guided along a path matching the contour of the saw blade teeth by a cam and an interchangeable cam track, which may be adjusted for saws of various contours and dimensions. The portable band saw sharpener is adjustable, hand-operated and portable.
Abstract: A knife sharpener is disclosed having an elongated handle and a blade sharpening unit mounted to a platform at a distal end of the handle for rotation between first and second secured positions for selective orientation of a blade draw direction to accommodate use by either a right-handed or a left-handed individual. The blade sharpening unit includes a lock tab biased for receipt within a selected one of a pair of keyways formed in the platform, each keyway being associated with one of the first and second positions.
Abstract: A device for sharpening rotary blades driven about a fixed axis of rotation, as widely used in cigarette manufacturing machines, including a pair of mutually coaxial grinding wheels distanced one from the other, angled in relation to the plane occupied by the rotary blade, rotatable about a common axis and able to traverse toward and away from the blade. The grinding wheels are mounted to a shaft capable of movement through a rectilinear path parallel to the plane occupied by the blade and set in motion by a drive system interlocked to a monitoring and control medium that is automatic in operation and programmable according to the rate of wear or loss of cutting edge of the blade. Also forming a part of the device are sensors able to indicate when the blade is totally worn, i.e. when reduced to its minimum working diameter.
Abstract: A knife sharpener is disposed adjacent a second electrical appliance of a design family. In an inoperative position, the knife sharpener includes design features mimicking the remainder of the design family. When moved to an operative position, the knife sharpener makes its sharpening wheel accessible to the edges of a knife blade. An energizing switch is coordinated for actuation as the knife sharpener reaches its operational position. In a combination that uses the same electric motor to drive the knife sharpener and a second appliance, different motor speeds are produced appropriate for the two functions to be performed. A bi-directional spring loading assembly permits deflection of the sharpening wheel in opposed lateral directions from a positively controlled neutral position to maintain substantially uniform application of sharpening force on the knife edges. An articulating knife guide permits the use of a single guide slot which can be inclined on either side of the sharpening wheel.
August 8, 1988
Date of Patent:
April 10, 1990
Black & Decker, Inc.
Michael A. Andrew, Thomas G. Siegel, Omer Shifflet, James Green, Duane Seaburg
Abstract: A fine smooth finish can be obtained on blades without grinding by drawing them against a rotating hardened disk with a smooth peripheral edge. One or a pair of hardened disks having smooth, rounded peripheral edges being disposed adjacent to and partially received by knife-guiding structure, having rotation imparting drive. The use of smooth edged hardened disks enables a very fine finished edge to be obtained, similar to the edge resulting from the use of a hand held steel, and often better.
Abstract: A device for reforming and grinding the blade of a knife to be sharpened comprising a supporting rod, a grinding plate having a plurality of concentric triangular projections at the both sides thereof, and guide disks arranged at the both sides of said grinding plate. A clearance into which the blade of a knife is inserted is provided between said grinding plate and guide disk.
Abstract: A resurfacing device for screwdrivers and like tools has two sets of rotary grinding members provided with grinding portions arranged along two intersecting planes at right angles to one another. One of the sets of rotary grinding members is mounted to rotate about a first axis to provide a first pair of opposed grinding portions and the other of the sets of rotary grinding members is mounted to rotate about a second axis to provide a second pair of opposed grinding portions. Each rotary grinding member of each set is yieldably urged toward the other of that set to urge each associated pair of opposed grinding portions against surfaces of a tool disposed therebetween. One set of the rotary grinding members is disposed opposite the other set to further provide the two pairs of opposed peripheral grinding portions that are disposed along the other of said intersecting planes.