US 11,674,320 B2
Elevator trench drain
David M. Gomo, Lake City, PA (US); Robert A. DiPlacido, Erie, PA (US); Jaroslaw J. Plachotnik, Jamestown, NY (US); and Jason E. Morris, Erie, PA (US)
Assigned to Zurn Industries, LLC, Milwaukee, WI (US)
Filed by Zurn Industries, LLC, Milwaukee, WI (US)
Filed on Apr. 12, 2021, as Appl. No. 17/228,448.
Application 17/228,448 is a continuation of application No. 16/780,623, filed on Feb. 3, 2020, granted, now 10,975,583.
Application 16/780,623 is a continuation of application No. 16/271,324, filed on Feb. 8, 2019, granted, now 10,570,628, issued on Feb. 25, 2020.
Application 16/271,324 is a continuation of application No. 15/689,896, filed on Aug. 29, 2017, granted, now 10,240,351, issued on Mar. 26, 2019.
Application 15/689,896 is a continuation of application No. 15/262,179, filed on Sep. 12, 2016, granted, now 9,777,489, issued on Oct. 3, 2017.
Claims priority of provisional application 62/298,159, filed on Feb. 22, 2016.
Prior Publication US 2021/0230886 A1, Jul. 29, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. E04F 17/00 (2006.01); E03F 5/04 (2006.01); E03F 5/06 (2006.01); B66B 13/30 (2006.01)
CPC E04F 17/00 (2013.01) [B66B 13/301 (2013.01); E03F 5/0407 (2013.01); E03F 5/06 (2013.01); E03F 2005/061 (2013.01); E04F 17/005 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An elevator trench drain comprising:
a trench including:
a base wall,
a drain passageway extending downwardly from the base wall to define a distal end opposite the base wall, wherein the drain passageway includes an upper section defining a first diameter proximate the base wall and a lower section defining a second diameter proximate the distal end, and wherein the ratio of the first diameter to the second diameter is between 1.3 to 1.7,
a plurality of side walls extending upwardly from the base wall to define a first end,
a plurality of secondary walls extending outwardly from the first end of at least a portion of the plurality of side walls to form a grate seat, and
wherein the base wall, plurality of side walls, and plurality of secondary walls together at least partially define a trench volume; and
a grate at least partially positionable within the trench volume, wherein the grate is configured to rest on and be supported by the plurality of secondary walls.
 
11. An elevator trench drain for use adjacent the threshold of an elevator, the elevator trench drain comprising:
a trench including:
a base wall,
a drain passageway extending downwardly from the base wall to define a distal end opposite the base wall, wherein the drain passageway includes an upper section defining a first diameter proximate the base wall, a lower section defining a second diameter proximate the distal end, and an intermediate section extending between the upper section and the lower section, wherein the first diameter is greater than the second diameter, and wherein the axial length of the upper section is greater than the axial length of the lower section,
a first wall extending from the base wall to produce a first distal edge,
a second wall extending from the base wall opposite the first wall to produce a second distal edge,
a pair of end walls extending from the base wall and extending between the first wall and the second wall,
a first grate seat extending outwardly from the first distal edge,
a second grate seat extending outwardly from the second distal edge, and wherein the base wall, the first wall, the second wall, the pair of end walls, the first grate seat, and the second grate seat at least partially define a trench volume; and
a grate at least partially positionable within the trench volume, wherein the grate is configured to rest on and be supported by the first grate seat and the second grate seat.