Paint brush and a clamping and locating device used in the same

A paint brush, which comprises:

• a brush plate;
• and
• a clamping and locating device, comprising
• a base including a mounting surface being used to be combined with the brush plate, a handle-retaining cavity formed on the mounting surface, and at least one boss on an inner wall of the handle-retaining cavity;
• a handle, which is used as a holding portion of the clamping and locating device and has a head portion being held in the handle-retaining cavity;
• the head portion including at least one mounting hole on the side of the head portion, a button-receiving recess on the top of the head portion, and a sliding groove on the bottom of the button-receiving recess;
• the button-receiving recess being divided into a first position and a second position, and the mounting hole and the boss being axially mated together to make the handle be pivotally mounted in the handle-retaining cavity;
• and
• a lock button being mounted in the button-receiving recess and having a sliding protrusion, which enters into the sliding groove and can slide along the sliding groove;
• the lock button being switched between the first position and the second position under the control of the sliding protrusion, and the handle being capable of being positioned on the first position and the second position;
• wherein the base further includes an elastic fastener disposed on one side of the mounting surface, and the elastic fastener can enter into and be held in a lock opening of the brush plate for fixing the base to the brush plate.