Elevator trench drain

Patent metadata

Field	Value
Publication number	US-9777489-B2
Application number	US-201615262179-A
Country	US
Kind code	B2
Filing date	Sep 12, 2016
Priority date	Feb 22, 2016
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

An elevator trench drain includes a trench and a drain passageway. The trench has a base wall with peripheral side walls extending upwardly therefrom to define a trench volume therein. The drain passageway extends downwardly from the base wall of the trench and places the trench volume in fluid communication with a lower opening of the drain passageway. The drain passageway has 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. The second cross-sectional area is less than the first cross-sectional area and this reduction in cross-sectional area produces a head pressure that increases the flow out of the lower opening.

First claim

What is claimed is:

1. 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; and
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;
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 drain passageway of the elevator trench drain is configured to permit the flow of 100 gallons per minute or more of water therethrough.

2. The elevator trench drain of claim 1 , comprising a grating hingedly connected to the trench.

3. The elevator trench drain of claim 2 , 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.

4. The elevator trench drain of claim 3 , wherein the pair of opposing elongated slots are integrally formed in the peripheral sidewalls of the trench.

5. The elevator trench drain of claim 3 , wherein the pair of opposing elongated slots are a wall extending generally perpendicularly 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.

6. The elevator trench drain of claim 1 , wherein the first section has a first distance of downward extension having the first cross-sectional area which is constant along the first distance of downward extension and wherein the second section has a second distance of downward extension having the second cross-sectional area which is constant along the second distance.

7. The elevator trench drain of claim 6 , further comprising an intermediate section between the first section and the second section of the drain passageway in which the intermediate section continuously connects the first section to the second section and reduces in diameter therebetween.

8. The elevator trench drain of claim 7 , wherein the intermediate section extends over a distance of downward extension and the intermediate section gradually tapers inward from the first section to the second section.

9. The elevator trench drain of claim 8 , wherein the intermediate section is frusto-conical.

10. The elevator trench drain of claim 8 , wherein first section and the second section have vertically-extending walls and wherein the intermediate section is angled 45 degrees relative to the vertically extending walls as the intermediate section extends downward and inward from the first section to the second section.

11. The elevator trench drain of claim 6 , wherein the first section and the second section are each tubular such that the first cross-sectional area is circular and the second cross-sectional area is circular.

12. The elevator trench drain of claim 1 , wherein the peripheral side walls of the trench include two pairs of linear parallel segments such that the trench is rectangular in shape.

13. The elevator trench drain of claim 1 , wherein the drain passageway is centrally aligned in the base wall of the trench.

14. The elevator trench drain of claim 1 , wherein the elevator trench drain is configured to be disposed proximate a lower edge of an elevator door.

15. The elevator trench drain of claim 1 , further comprising a flange disposed outward of the peripheral side walls.

16. The elevator trench drain of claim 1 , wherein a ratio of a diameter of the first section to a diameter of the second section is 1.5.

17. The elevator trench drain of claim 1 , wherein a ratio of a diameter of the first section to a diameter of the second section is in a range of 1.4 to 1.6.

18. The elevator trench drain of claim 1 , wherein a depth of elevator trench drain exclusive of the drain passageway is 1.75 inches.

19. The elevator trench drain of claim 1 , wherein the trench further comprises an inwardly extending step, the inwardly extending step extending inwardly away from at least one peripheral side wall and extending upwardly away from the trench base wall to form a grating seat.

20. The elevator trench drain of claim 19 , wherein the peripheral side walls have an upper surface defining an upper peripheral lip, and the inwardly extending step has a grating seat surface extending inwardly away from approximately halfway between the upper peripheral lip of the at least one peripheral side wall and the trench base wall.

21. The elevator trench drain of claim 20 , wherein the trench further comprises an outwardly extending peripheral flange extending away from the upper peripheral lip and having a top surface offset downward from the upper peripheral lip.

22. 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.

23. The elevator trench drain of claim 22 , wherein the trench further comprises an inwardly extending step, the inwardly extending step extending inwardly away from at least one peripheral side wall and extending upwardly away from the trench base wall to form a grating seat.

24. The elevator trench drain of claim 23 , wherein the peripheral side walls have an upper surface defining an upper peripheral lip, and the inwardly extending step has a grating seat surface extending inwardly away from approximately halfway between the upper peripheral lip of the at least one peripheral side wall and the trench base wall.

Assignees

• Zurn Ind Llc

Inventors

• Gomo David M
• Diplacido Robert A
• Plachotnik Jaroslaw J
• Morris Jason E

Classifications

• E04F17/005

  Lift shafts · CPC title

• E03F2005/061

  hinged to the body of the gully · CPC title

• E03F5/06

  Gully gratings · CPC title

• E03F5/0407

  Floor drains for indoor use · CPC title

• E04F17/00 Primary

  Vertical ducts; Channels, e.g. for drainage (pipes in general F16L; pipe-line systems F17D {; drainage devices in floors E03F5/04; roof drainage E04D13/04}) · CPC title