Abstract: A knife sharpening device includes a vertically-oriented base having a vertically-oriented slot. Mounted on the base, on one side of the slot are two crossed sharpening members of a rod-like configuration. A lower end of each of the crossed sharpening members is anchored in a horizontally-extending pivot pin with a terminal end of each of the sharpening members extending beyond the pivot pins and engaging a horizontally-extending stop pin. The pivot pins are rotatably mounted in the base and extend through the base. A pivot wheel is mounted concentrically on a free end of the pivot pins on an opposite side of the base from the sharpening members. Two radially-extending set screws extend through the pivot wheels and engage a flat surface of the pivot pin to hold the pivot wheels on the pivot pins. Extending between the two set screws, threadingly mounted in the two pivot wheels, is a tensioning spring.

Abstract: A pair of slightly peripherally overlapped and axially spaced rotary grinding members are provided and journalled for rotation about generally parallel axes of rotation. The peripheral portions of the remote axial faces of the grinding members are oppositely bevelled and rotary torque producing structure is provided and drivingly coupled to the grinding members for driving the latter in opposite directions of rotation. Further, structure is provided defining oppositely facing substantially co-planar bearing surfaces on opposite sides of and disposed substantially normal to a plane normal to the axes of rotation of the rotary grinding members and disposed between the overlapped portions of the rotary grinding members. The bearing surfaces are disposed in generally equal chord planes of the rotary grinding members spaced substantially equally from and paralleling the axes of rotation of the rotary grinding members.