E - Fixed Constructions – 02 – D
Patent
E - Fixed Constructions
02
D
61/2.4
E02D 29/12 (2006.01) B28B 1/14 (2006.01)
Patent
CA 1208025
ABSTRACT OF THE DISCLOSURE A novel manhole base is provided herein formed of a suitable casting material. The manhole base includes a base portion and a hollow cylindrical shaped sidewall extending upwardly from the base portion, the sidewall having at least first and second openings. An annular shaped sealing gasket is arranged in each opening. An invert is formed in the surface of the base portion and extends between the first and the second sidewall openings, the invert having a substantially semi-circular shaped cross-section. Clearance grooves are provided in the base portion between the outer ends of the invert adjacent the associated openings. Each of these clearance grooves extends into the interior of the base portion from the interior sidewall by an amount which is sufficient to facilitate insertion of a coupling pipe into each opening by providing sufficient clearance for the end of the pipe extending into the interior of the manhole assembly and even in the event that the coupling pipe is oriented at an angle of up to 15° during insertion of that pipe into the manhole assembly.
454539
A-Lok Products Inc.
Borden Ladner Gervais Llp
LandOfFree
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