# US 4,515,498 A · Slotted drainage grate with support

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- Number: US 4,515,498 A
- Document ID: US4515498A
- Status: Granted
- Kind: A
- Application number: 06/506,244
- Filed: 1983-06-20
- Granted: 1985-05-07
- Earliest claimed: 1982-11-23
- Assignees: Polydrain, Inc.
- Inventors: Roland Thomann; Markus Amann
- Web page: https://patentgrep.com/patent/US4515498A

## CPC

- E01C 11/227: {Gutters; Channels (E01C11/223 takes precedence; permanently installed flushing means E01H3/04); Roof drainage discharge ducts set in sidewalks}
- E01C: CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR (forming roads or like surfaces by compacting or grading snow or ice E01H)

## Abstract

A slotted grate (3) is disclosed which is formed of a sheet metal strip with slot (15) therein. Reinforcement of the grate (3) is achieved by inserting a sheet metal arch support (30) between two adjacent slots (15). The arch support (30) is formed of a piece of sheet metal bent into a U-shape with shoulders (35, 36) of its end sections (31) being spaced further apart than the shoulders (37, 38) of its midsection (32). A process is disclosed wherein the slotted grate (3) is constructed by first placing arch supports (30) between the desired slots (15) and then double bending the edge sections of the sheet material forming the grate (3) to form two U-shaped side channels with the shoulders (35, 36) of arch support (30) locked securely therein.

## Claims

### Claim 1

A support for a grate of the type comprised of a strip of sheet metal having transverse water drainage slots therein, the edges of said sheet metal being bent twice along its longitudinally extending edges to form two U-shaped side channels whose open sides are mutually opposed, said support comprising:
(a) a U-shaped arch open on each end and adapted to be positioned transversely across said grate in contact with opposite sides thereof and intermediate at least some of the slots to provide support to the width of the grate;
(b) each end of said arch defining a shoulder having a width and depth sufficient to be positioned in said opposing side channels and provide support to the side of said grate; and
(c) said support including a mid-section intermediate its ends, wherein the shoulder depth of the mid-section of the support is greater than at the end sections so that the mid-section extends downwardly from said two U-shaped side channels and bears against and supports the innermost shoulder of the mutually opposed, inwardly facing side channels.

### Claim 2 (depends on 1)

A support according to claim 1 wherein the midsection of the arch of said support is arcuate and wherein the opposing end sections are planar, said support being adapted to cooperate with a grate having a mating arcuate surface between each slot for receiving the midsection of said support and wherein the side channels of said grate are planar for matingly receiving the planar end sections of said support.

### Claim 3 (depends on 2)

A support according to claim 2 wherein the end sections of said support are flared apart to each define an arch having a width greater than that of the midsection of said support.

### Claim 4

A slotted grate having increased resistance to flexure, and comprising:
(a) a strip of sheet material, the edges of which are bent twice along its longitudinally extending edges to form two U-shaped side channels whose open sides are mutually opposed, each said side channel defining a first shoulder having a free end and adapted to support a side wall section of a drainage channel into which the grate is positioned and a second shoulder defining the longitudinally extending dimension of said grate, the surface of the grate intermediate the two side channels defining a plurality of transverse slots therein along the length thereof for the passage of drainage water therethrough into a drainage channel onto which the grate is adapted to be positioned, the combination therewith of a support for said grate comprising:
(b) a U-shaped arch open on each end and adapted to be positioned transversely across said grate in contact with the underside thereof intermediate at least some of the slots to provide support to the width of said grate;
(c) each end of said support defining a shoulder having a width and depth sufficient to be positioned in and provide support to the two U-shaped mutually opposed side channels; and
(d) said support including a mid-section intermediate its ends, wherein the shoulder depth of the mid-section of the support is greater than at the end sections so that the mid-section extends downwardly from said two U-shaped side channels and bears against and supports the innermost shoulder of the mutually opposed, inwardly facing side channels.

### Claim 5

A drainage channel and grate assembly comprising;
(a) a drainage channel comprising at least one elongate section having inner and outer walls, the inner walls defining a U-shaped, upwardly opening mouth for the passage of drainage water thereinto;
(b) a slotted grate for being positioned in said drainage channel for providing a bearing surface over said drainage channel while allowing liquid to drain through said slotted grate, said slotted grate including a strip of sheet material, the edges of which are bent twice along its longitudinally extending edges to form two U-shaped side channels whose open sides are mutually opposed, each said side channel defining a first shoulder having a free end and adapted to support a side wall section of a drainage channel into which the grate is positioned and a second shoulder defining the longitudinally extending dimension of said grate, the surface of the grate intermediate the two side channels defining a plurality of transverse slots therein along the length thereof for the passage of a drainage water therethrough into said drainage channel;
(c) a U-shaped arch open on each end and adapted to be positioned transversely across said grate in contact with the underside thereof intermediate at least some of the slots to provide support to the width of said grate;
(d) each end of said support defining a shoulder having a width and depth sufficient to be positioned in and provide support to the two U-shaped mutually opposed side channels; and
(e) said support including a mid-section intermediate its ends, wherein the shoulder depth of the mid-section of the support is greater than at the end sections so that the mid-section extends downwardly from said two U-shaped side channels and bears against and supports the innermost shoulder of the mutually opposed, inwardly facing side channels.

### Claim 6 (depends on 5)

A drainage channel and grate assembly according to claim 5 wherein the midsection of the arch of said support is arcuate and wherein the opposing end sections are planar, said support being adapted to cooperate with a grate having a mating arcuate surface between each slot for receiving the midsection of said support and the side channels of said grate have a planar surface for matingly receiving the planar end sections of said support.

### Claim 7 (depends on 5)

A drainage channel and grate assembly according to claim 5 wherein the end sections of said support are flared apart to each define an arch having a width greater than that of the midsection of said support.

### Claim 8 (depends on 5)

A drainage channel and grate assembly according to claim 5 wherein said supports are positioned transversely across said grate intermediate alternate slots.