Filter assembly for use in drainage system
View Patent ↗A filter assembly for use in drainage systems to prevent the buildup of eroded materials such as soil, leaves and other debris is disclosed. The assembly includes a unitary frame and a filter media attached to the frame and is adapted to be retained within a component of a drainage sewer such as a catch basin. A porous material filter media such as a woven or non-woven geotextile allows for the flow of water through the filter while retaining debris or soil within the filter. The filter media extends into the basin to provide volume for the retained material without blocking the entire surface of filter.
1. A combination filter and drainage system including a grate assembly, the grate assembly having a detent extending inwardly from a peripheral sidewall to form an upwardly-facing surface supporting a downwardly-facing surface of a removable drainage grate, the filter comprising:
a one piece, enclosed loop frame sandwiched between the downwardly facing surface of the grate and the detent's upwardly facing surface, the frame encircling an interior space;
a filter media having a sump area for collecting debris, an upper edge, and at least one pocket formed around said upper edge enclosing at least a portion of the frame;
a first supportive webbing extending contiguously from a first side of the upper edge beneath the filter media sump area to a second side of the upper edge opposite the first side, the first supportive webbing terminating at opposing ends in loops of webbing hanging beneath the grate and within the frame's interior space; and
a second supportive webbing extending contiguously from a third side of the upper edge beneath the filter media sump area to a fourth side of the upper edge opposite the third side, the second supportive webbing terminating at opposing ends in loops of webbing hanging beneath the grate and within the frame's interior space;
wherein the first and second supportive webbings cross at a transverse intersection beneath the sump area to support the weight of any debris in the sump area and to dispose the loops at spaced locations in the interior space;
wherein all portions of the filter remain substantially below an upwardly-facing surface of the grate in operable orientation.
2. The combination filter and drainage system of claim 1 , wherein said filter is a woven geotextile material.
3. The combination filter and drainage system of claim 1 , wherein the pocket is formed by doubling the filter material over to form a double layer of filter material around the upper edge of the filter material and sewing the double layer to form the pocket; and further comprising: webbing sewn across said filter for supporting debris within said pocket.
4. The combination filter and drainage system of claim 1 , wherein the one piece frame comprises:
first and second substantially parallel frame members;
third and fourth substantially parallel frame members that are perpendicular to said first and second frame members, whereby the first, second, third and fourth frame members support the filter media and have a thickness that is substantially smaller than a width, where the thickness is measured across a gap between the downwardly facing surface of the grate and the detent's upwardly facing surface; and
a plurality of welds between the first, second, third and fourth frame members forming a one piece frame.
5. A filter in combination with a drainage system including a grate assembly, the grate assembly having a detent extending inwardly from a peripheral sidewall to form an upwardly-facing surface supporting a downwardly-facing surface of a removable drainage grate, the filter comprising:
a one piece, enclosed loop frame sandwiched between the downwardly facing surface of the grate and the detent's upwardly facing surface, the frame encircling an interior space;
a filter media having a sump area for collecting debris, an upper edge, and at least one pocket formed around said upper edge enclosing at least a portion of the frame;
a first supportive webbing extending contiguously from a first side of the upper edge beneath the filter media sump area to a second side of the upper edge opposite the first side, the first supportive webbing terminating at opposing ends in loops of webbing hanging beneath the grate and within the frame's interior space;
a second supportive webbing, spaced a substantial distance from the first supportive webbing, and extending contiguously from the first side of the upper edge beneath the filter media sump area to the second side of the upper edge, the second supportive webbing terminating at opposing ends in loops of webbing hanging beneath the grate and within the frame's interior space; and
a third supportive webbing extending contiguously from a third side of the upper edge beneath the filter media sump area to a fourth side of the upper edge opposite the third side;
wherein the third supportive webbing crosses the first and second supportive webbings at a transverse intersection beneath the sump area to support the weight of any debris in the sump area and to dispose the loops at spaced locations in the interior space;
wherein all portions of the filter remain substantially below an upwardly-facing surface of the grate in operable orientation.
6. The combination filter and drainage system of claim 5 , wherein said filter is a woven geotextile material.
7. The combination filter and drainage system of claim 5 , wherein the pocket is formed by doubling the filter material over to form a double layer of filter material around the upper edge of the filter material and sewing the double layer to form the pocket; and further comprising: webbing sewn across said filter for supporting debris within said pocket.
8. The combination filter and drainage system of claim 5 , wherein the one piece frame comprises:
first and second substantially parallel frame members;
third and fourth substantially parallel frame members that are perpendicular to said first and second frame members, whereby the first, second, third and fourth frame members support the filter media and have a thickness that is substantially smaller than a width, where the thickness is measured across a gap between the downwardly facing surface of the grate and the detent's upwardly facing surface; and
a plurality of welds between the first, second, third and fourth frame members forming a one piece frame.