Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1976-04-16
1978-02-21
Pavelko, Thomas P.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
264274, 264333, 425126R, 425517, B28B 100, B28B 2300
Patent
active
040752720
ABSTRACT:
A method of mounting steps on the inner wall surface of a manhole section comprising implanting the steps in the section while the same is still green and following removal of the inner form but before removal of the outer form, positioning each step in confronting relation with the manhole section and thereupon smoothly and uniformly, without vibration and hammering, pushing the step into the concrete and compacting the concrete around the implanted step. The apparatus may be portable and shifted into the manhole section through an end thereof after the inner form has been removed but prior to removal of the outer form, and positioned against the base ring at opposite inside diameters thereof and engaging the outer form at the top of the manhole section and while thus engaged urging the step into the manhole section as aforesaid. Alternatively the apparatus may be stationary and the manhole section temporarily moved thereto and supported thereon during step implanting.
REFERENCES:
patent: 992782 (1911-05-01), Lambie
patent: 2682703 (1954-07-01), Schob
patent: 2688175 (1954-09-01), Billner
patent: 3257700 (1966-06-01), Thomas
patent: 3551967 (1971-01-01), Williams
patent: 3922133 (1975-11-01), Crawford
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