초록 ▼

A loose fill lightweight plastic aggregate for a preassembled drainage line unit. The bead comprises a central portion, at least three legs extending from each of the top and bottom of said central portion, a plurality of channels each defined by adjacent ones of said legs, the width of said legs be

A loose fill lightweight plastic aggregate for a preassembled drainage line unit. The bead comprises a central portion, at least three legs extending from each of the top and bottom of said central portion, a plurality of channels each defined by adjacent ones of said legs, the width of said legs being greater than the width of said channels. A rib protrides laterally from each of the sides of the central portion. In the drainage unit, the beads maintain a substantial void space for flow of waste water and also provide maximum surface area for bacterial breakdown of sewage wastes.

대표청구항 ▼

1. A lightweight expanded plastic bead for use as aggregate in a preassembled drainage line unit, said bead comprising a solid central portion of generally rectangular cross section, a plurality of solid legs extending upwardly a substantial distance from the top of said central portion and a plural

1. A lightweight expanded plastic bead for use as aggregate in a preassembled drainage line unit, said bead comprising a solid central portion of generally rectangular cross section, a plurality of solid legs extending upwardly a substantial distance from the top of said central portion and a plurality of solid legs extending downwardly a substantial distance from the bottom of said central portion, a plurality of channels each defined by adjacent legs and each having a substantial depth, the width of said legs being greater than the width of said channels so as to prevent the legs of one bead from nesting within the channels of an adjacent bead when in use, the length of the sides of said bead being no greater than three inches.