Elevator trench drain

An elevator trench drain comprising:

• a trench having a base wall with peripheral side walls extending upwardly therefrom, the trench defining a trench volume therein;
• a drain passageway extending downwardly from the base wall of the trench and placing the trench volume in fluid communication with a lower opening of the drain passageway, the drain passageway having a first section proximate the base wall defining a first cross-sectional area and a second section distal the base wall defining a second cross-sectional area in which the second cross-sectional area is less than the first cross-sectional area;
• and
• a grating hingedly connected to the trench;
• wherein a reduction from the first cross-sectional area to the second cross-sectional area creates a head pressure that increases the flow out of the lower opening and wherein the peripheral side walls of the trench have a pair of opposing elongated slots formed therein and the grating has a pair of posts on opposing ends thereof and wherein each of the pair of posts on the grating are received in a respective one of the pair of opposing elongated slots of the trench, and wherein the pair of opposing elongated slots are a wall extending generally perpendicularly inward from the peripheral side wall of the trench volume and wherein the wall forms a closed loop forming one of the slots into which one of the posts of the grating is received, and wherein the elongated slots have a volume defined by the wall extending generally perpendicularly inward from the peripheral side wall of the trench volume and an interior surface of the peripheral side wall.