Patent ID: 7028728

Claim:
A wood planing machine comprising: a base; a plurality of screw rods mounted rotatably on and standing upright from said base, each of said screw rods having a helical thread that defines upper and lower helical surfaces; a cutter carriage formed with a plurality of coupler-engaging parts, each of which is formed with opposite upper and lower coupler-receiving holes for extension of a respective one of said screw rods therethrough, upper and lower fastener-receiving holes that are respectively in spatial communication with and that are transverse to said upper and lower coupler-receiving holes, and upper and lower inner threads that respectively define said upper and lower fastener-receiving holes; a plurality of coupling units, each of which includes upper and lower couplers that extend respectively into said upper and lower coupler-receiving holes of a respective one of said coupler-engaging parts, each of said upper and lower couplers having a head portion and a shank portion that is reduced in diameter and that extends from said head portion into the respective one of said upper and lower coupler-receiving holes, and being formed with an inner hole extending through said head and shank portions for extension of a respective one of said screw rods therethrough, and an inner thread defining said inner hole and engaging threadedly the respective one of said screw rods so as to permit movement of said cutter carriage along said screw rods upon rotation of said screw rods relative to said cutter carriage, said inner thread defining upper and lower helical surfaces; and a plurality of fastening units, each of which includes upper and lower screws that are engageable threadedly and respectively with said upper and lower inner threads of a respective one of said coupler-engaging parts and that are extendable respectively into said upper and lower coupler-receiving holes to engage releasably and respectively said shank portions of said upper and lower couplers for securing said upper and lower couplers to said cutter carriage, said upper and lower screws being operable to permit position adjustment of said upper and lower couplers relative to said cutter carriage to a tightening position, in which said upper helical surface of said inner thread of said upper coupler abuts against said lower helical surface of said helical thread of a respective one of said screw rods and in which said lower helical surface of said inner thread of said lower coupler abuts against said upper helical surface of said helical thread of the respective one of said screw rods.