Side rail for trenchduct

Details Side rail for trenchduct Side rail for trenchduct

1989-10-13

1991-04-02

Scherbel, David A.

Static structures (e.g., buildings)

With lifting or handling means for primary component or...

Position adjusting means; e.g., leveling

52221, 138111, 174 49, E04B 548

Patent

active

050037374

ABSTRACT:
Side rail structure for trenchduct side rail has a lower section and an upper section. The lower section is thin, galvanized sheet steel and the upper section is an aluminum extrusion clamps connect the upper and lower sections so that in a full bottom trench the whole trench can be adjusted. In both full bottom and bottomless trench, the upper section can be adjusted with respect to lower section. In the full bottomless trench a friction fit holds upper and lower sections together.

REFERENCES:
patent: 3435568 (1969-04-01), Hoseason et al.
patent: 3593472 (1971-07-01), Bargar
patent: 4517777 (1985-05-01), Calhoun
patent: 4612746 (1986-09-01), Higgins
patent: 4637185 (1987-01-01), Bowman

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