Planing attachment for jointers

A board planing attachment for a jointer having a bed with a flat upper surface and a rotary cutter adjacent to one end of said bed, comprising:

• a pair of flat bars connected flatwise to said upper surface to extend in spaced side-by-side relation along the normal line of board movement over said flat upper surface,
• a pair of screw rods carried by each bar to extend upwardly therefrom with their axes normal to said flat upper surface, said rods being held to said bars against rotation,
• four sprocket gears, each having an internally threaded hub threaded on a respective rod,
• a bed plate overlying said bed upper flat surface and having an end portion overlying said cutter, said bed plate having a lower flat surface and a slide connection with each sprocket hub, each slide connection being disposed at a respective one of four spaced peripheral portions of said bed plate with two on each side of the latter, so that as said sprockets are rotated said bed plate is moved vertically at each said connection, whereby the lower flat surface of said bed plate may be brought into parallelism with the upper flat surface of said bed by screw adjustment of respective sprockets,
• the lower flat surface of said bed plate providing a guide for the upper surface of a board slid along the upper flat surface of said bed to define a predetermined selectable distance between said lower flat surface and said cutter.