Seal for manholes and drains

Details Seal for manholes and drains Seal for manholes and drains

1993-11-19

1995-03-21

Arola, Dave W.

Pipe joints or couplings

Flexible joint, rigid members

Concrete, clay, or masonry pipe

285291, 285330, 285910, F16L 4900

Patent

active

053989791

ABSTRACT:
The sections of concrete tubes or rings are connected end to end by means of a joint, and, in order to prevent aggregates and other undesirable materials to penetrate into the joint when a space is formed in the latter following climate modifications or other disturbances, there is disposed at the level of the joint, a ring of flexible material, which includes a flange made to remain pressed against the joint and to cover the latter permanently even if a space is produced in the joint. This ring is preferably fixed at one of the sections of tube and this ring may even be made of two interconnecting members.

REFERENCES:
patent: 3380763 (1968-04-01), Schmunk
patent: 3809412 (1974-05-01), Glover
patent: 4076283 (1978-02-01), Harrison
patent: 4116474 (1978-09-01), Wolf
patent: 4325572 (1982-04-01), Arntyr et al.
patent: 4394025 (1983-07-01), Anderson
patent: 4443282 (1984-04-01), Stachitas
patent: 4703940 (1987-11-01), Dana
patent: 4711473 (1987-12-01), Glover
patent: 4961599 (1990-10-01), Delery et al.
patent: 5127680 (1992-07-01), Takei

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