Patent Number: 6,170,095

Title: Main drain safety grate apparatus

Abstract: A main drain safety grate apparatus utilizes an elongate drain, frame and grate that distribute the suction flow of water over a large surface to avoid full blockage of the grate, and also utilizes a bendable or deformable, upwardly releasable grate that has a section slotted to permit water to drain therethrough. The grate is ordinarily restrained from upward movement by a slot in each end of the frame into which the ends of the grate fit, and from downward movement by two shelves on which the grate may be supported. The grate may be released from the frame by an upward force applied at the section provided for drainage, which bends, or bows, the grate in an arcuate shape, and acts to shorten the length of the grate relative to the slots into which it is fitted. The bowing effect also serves to rotate a rounded surface and a corner of the end of the grate so as to reduce the effective length by rotating the corner away from the point of contact of the slot and the grate, and permitting that contact point to move over the rounded surface.

Inventors: Zars; Leif Alexander (San Antonio, TX)


International Classification: E04H 4/00 (20060101); E04H 4/12 (20060101); E04H 004/00 ()

Expiration Date: 01/09/2013