Double-acting latch for hinged plastic box

In a plastic box comprising hinged container and cover parts, an improved double-acting latch comprising:

• a rail of T-shaped cross-section extending along and integral with a sidewall of one of said parts,
• a flexible plastic slide having flanges fitting around the shoulders of the T-shaped rail and being slidable along the rail between open and locked positions,
• one shoulder of the rail and one flange of the slide being formed with notches which are aligned when the slide is at the open position,
• a tab integral with the other of said parts and adapted to fit into the notch in the rail when the box is closed while the slide is at the open position and to be retained by the notched flange upon movement of the slide toward the locked position to latch the two box parts together, and
• a detent integral with the slide adapted for snap-fitting engagement and disengagement with the rail when the slide is at its locked position to provide a second latching action.