Blocking device for use in a sewer manhole

Details Blocking device for use in a sewer manhole Blocking device for use in a sewer manhole

1978-05-08

1980-09-30

Therkorn, Ernest G.

Liquid purification or separation

Structural installation

2482253A, 1375274, 1375278, 52101, B01D 3504

Patent

active

042254353

ABSTRACT:
The invention concerns a blocking device for obstructing the opening of an inlet pipe in a sewer manhole, so that rats and like rodents are restrained. The blocking device comprises a ball or pear-shaped floatable blocking body for automatic blocking of the pipe opening by gravity when there is no flow of waste material into the manhole, said blocking body being pivotally suspended from a supporting means which by means of a tightening member is secured above the pipe opening by being wedged between opposite wall portions of the manhole. The blocking device also has a stopping means for limiting the penetration depth of said blocking body in the inlet pipe.

REFERENCES:
patent: 468058 (1892-02-01), McNelly
patent: 999305 (1911-08-01), Gurnett
patent: 1237428 (1917-08-01), Watrous
patent: 2718941 (1955-09-01), Robinson
patent: 3118469 (1964-01-01), Schliesser

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