Patent ID: 6415829
Filing Date: 2002-07-09
Classification: B27C,Y10T

Abstract:
A wood planing machine comprising:a base having two opposite sides; two pairs of parallel hollow posts that extend upright from said opposite sides of said base, and that are respectively formed with elongated slots extending along lengths of said posts; two pairs of parallel screw rods disposed respectively in said posts, and rotatable about axes defined by said screw rods, each of said screw rod shaving a portion that is accessible via said slot in the respective one of said posts; four first sprockets connected respectively to said screw rods; a chain engaging said first sprockets so as to synchronize rotations of said screw rods; a cutter carriage including first and second carriage seats mounted movably and respectively on said pairs of said posts, each of said carriage seats includes top and bottom plates transverse to and spanning the respective pair of said posts, and two opposite side plates interconnecting said top and bottom plates and formed with openings that are registered with said slots in said posts; four threaded members mounted respectively on said side plates of said carriage seats, each of said threaded members including a bracket plate mounted on the respective one of said side plates, and a sector-shaped threaded portion projecting from said bracket plate through said opening in the respective one of said side plates to engage threadedly a respective one of said screw rods so as to permit said carriage seats to move simultaneously along said posts when said screw rods rotate synchronously, and to be held firmly at a desired height relative to said base upon stopping rotation of said screw rods; a drive shaft disposed rotatably on said base parallel to said screw rods and adjacent to said first carriage seat; a second sprocket connected to said drive shaft and engaging said chain such that rotation of said drive shaft can result in synchronous rotation of said screw rods; a motor-driven rotary cutter mounted on said cutter carriage and having a rotatable drive axle that extends into said first carriage seat between said top and bottom plates and between said side plates of said first carriage seat; a drive gear mounted securely and co-axially on said drive axle so as to be rotatable therewith; a gear mounting seat having upper and lower plate portions and a bridging plate portion that interconnects said upper and lower plate portions; an upper driven gear mounted rotatably on said upper plate portion of said gear mounting seat, and sleeved slidably on and rotatable with said drive shaft; and a lower driven gear mounted rotatably on said lower plate portion of said gear mounting seat, and sleeved slidably on and rotatable with said drive shaft; said gear mounting seat being movable along said drive shaft relative to said first carriage seat to a selected one of an intermediate first position, where said upper and lower driven gears disengage said drive gear, an upper second position, where said upper driven gear disengages and said lower driven gear engages said drive gear, and a lower third position, where said lower driven gear disengages and said upper driven gear engages said drive gear.