Locking device for a wooden planing machine

A locking device for a wooden planing machine, positioned on an upper surface of a movable machinery base movably mounted on four posts provided at four corners of a fixed base, said locking device comprising:

• two brackets respectively fixed at two opposite sides of an upper surface of said movable machinery base, each bracket having spaced apart sleeves respectively on a front portion and a rear portion and separated by an opening;
• a long drive shaft having two opposite ends respectively rotatably connected to said two brackets, a handle extending from the drive shaft, and an eccentric cam respectively fixed to each opposite end of said drive shaft, said cam located in said opening of each bracket, each eccentric cam having a short radius portion and a long radius portion;
• four tightening pins, each respectively passing through a coil spring in each of said sleeves, each tightening pin having an end fixed with a tightening member after passing through said sleeve and a head located in said opening and in contact with the eccentric cams, each of said tightening members being located at an outer side of said sleeve and having a front concave surface to fit around an outer convex surface of one of said posts;
• whereby,
• said eccentric cams have said short radius portions in contact with the heads of the tightening pins, said coil springs elastically move said tightening pins inwardly to separate said front concave surfaces of said tightening pins from said posts when said handle is placed in an unlocking position, and whereby said eccentric cams have said long radius portions in contact with said heads to move said tightening pins outwardly to thereby move said front concave surfaces of said tightening members to fit tightly around the convex outer surfaces of said posts, and locking said movable machinery base when said handle is pressed down to a locking position from the unlocking position.