Patent ID: 7533704

Claim:
A tool-shaft locking device for a planing machine, said tool shaft comprises of two shaft bearings, a shaft body, a plate cover, a planing knife and plural bolts, a first one of said shaft bearings tightly connected with a right end of said shaft body and then connected to a belt wheel, said belt wheel being driven to rotate by an endless belt extended around said belt wheel and also around another belt wheel fixed on a spindle of a motor: a locking device connected with a second one of said shaft bearings connected with a right end of said shaft body, said locking device consisting of a bearing base, a locking rod, a spring and a locking button; said bearing base connected with said second shaft bearing, said bearing base provided with a hole to align to a position hole bored in said right end of said shaft body, two opposite deep position grooves formed at an upper and a lower side of said hole of said bearing base; said locking rod having a first threaded end tightly engaging with said locking button and a second end fitting through said hole of said bearing base; said locking button provided with a center threaded hole in an inner end thereof for said first threaded end of said locking rod to engage tightly, said locking button having two opposite position projections extending forward from the inner end; and, said two opposite position projections of said locking button possible to fit in said deep grooves of said bearing base, said locking button then rotated inward to force said locking rod moved threadably and gradually into said position hole of said shaft body for locking said tool shaft immovable.