Patent ID: 8596908
Filing Date: 2013-12-03
Classification: E02B,E03F

Abstract:
1. A drainage member comprising: an annular surface including a first side and a second side; an aperture section comprising a plurality of apertures formed in the first side of the annular surface; an upper end segment that does not have a plurality of apertures formed therein; and a lower end segment that does not have a plurality of apertures formed therein, wherein: each aperture extends in a circumferential direction along the annular surface from a first point to a second point, and a length of each aperture from the first point to the second point is at least three times a width of each aperture; each aperture comprises an upper edge and a lower edge; the width of each aperture is defined by a distance between the upper edge and the lower edge of each aperture; a distance between each aperture is defined by a distance between a lower edge of a first aperture and an upper edge of a second aperture, the distance being the same between each aperture of the drainage member; a length of the upper end segment is defined by an upper end of the drainage member and the upper edge of an immediately adjacent aperture; a length of the lower end segment is defined by a lower end of the drainage member and the lower edge of an immediately adjacent aperture; an axial length of the aperture section is a distance that spans all of the plurality of apertures formed in the drainage member from the upper end segment to the lower end segment; the axial length includes the width of each aperture in the drainage member and the distance between each aperture; and the axial length is less than a sum of four multiplied by an outer diameter of the drainage member.