Static structures (e.g. – buildings) – With entrance for persons or objects in horizontal or... – With additional enclosure structure; e.g. – manhole
Patent
1977-10-25
1980-02-12
Leppink, James A.
Static structures (e.g., buildings)
With entrance for persons or objects in horizontal or...
With additional enclosure structure; e.g., manhole
404 26, E02D 2914
Patent
active
041876474
ABSTRACT:
Plastic extender rings for manholes are produced by molding as a unitary member or extrusion or in molded segments and are seated by the use of caulking or other adhesive material. The manhole cover, which is elevated by the plastic ring from the old pavement level to a new pavement level, is rendered more silent to traffic and is seated more evenly. Plastics are employed which will not melt at the application temperature of asphalt but will soften somewhat to conform better to the contour of the manhole cover and/or underlying manhole top ring. Plastic fillers may be employed in the product to regulate plasticity and increase resistance to deterioration from the elements and from ultraviolet.
REFERENCES:
patent: 684708 (1901-10-01), McFall
patent: 1260024 (1918-03-01), Parton
patent: 1639495 (1927-08-01), Frame
patent: 1987502 (1935-01-01), Born
patent: 3308727 (1967-03-01), Hurt
patent: 3618275 (1971-11-01), Ance
patent: 3629981 (1971-12-01), McCaffery
patent: 3926533 (1975-12-01), Binette
patent: 3961453 (1976-06-01), Couwenbergs
patent: 4121390 (1978-10-01), Hall
Hall Margaret T.
Leppink James A.
Raduazo Henry E.
Turner, Jr. James B.
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