×

Modular drain system

  • US 4,490,067 A
  • Filed: 12/17/1981
  • Issued: 12/25/1984
  • Est. Priority Date: 12/17/1981
  • Status: Expired due to Term
First Claim
Patent Images

1. A below ground hollow longitudinal drain and expansion joint element adapted to be secured in the ground and embedded in concrete, said drain element receiving drainage water through the top surface and comprising:

  • (a) a polygonal hollow upper portion having a first transverse dimension including;

    (i) a substantially horizontal top surface, (ii) a left side wall and (iii) a right side wall; and

    (b) a substantially cylindrical lower portion having a second transverse dimension which is uniform in diameter throughout and which is substantially larger than the said first transverse dimension of the upper portion, the interior at the top of said lower portion being in open communication with the interior of and at the bottom of said upper portion,said upper portion being integrally formed with said lower portion and being relatively offset in structure so that when said top surface is positioned horizontally, one end of said top surface is in vertical alignment with one side wall extremity of said lower cylindrical portion, said longitudinal element being sufficiently resilient to absorb stresses caused by expansion and contraction of concrete in which said element is installed.

View all claims
  • 4 Assignments
Timeline View
Assignment View
    ×
    ×