Scraper bowl with hydraulic safety lock

Details Scraper bowl with hydraulic safety lock Scraper bowl with hydraulic safety lock

1974-12-09

1976-04-06

Pellegrino, Stephen C.

Excavating

Snow or ice removing or grooming by portable device

Railway clearer

37129, 91414, E02F 500

Patent

active

039479811

ABSTRACT:
Frame-drawn scraper having a bowl with hydrospring suspension and hydraulic pump, comprising: bowl raise-lower means disposed between and connecting the scraper draft frame and bowl; and an intervening hose, accumulator, and motion sensitive blocking safety valve connected in circuit in that order from the pump to the bowl means, responsive to extreme lowering movement of the bowl if the hose ruptures, to hydraulically lock the bowl from farther lowering by automatically blocking the circuit.

REFERENCES:
patent: 3127688 (1964-04-01), Hein et al.
patent: 3150568 (1964-09-01), Junck et al.
patent: 3450418 (1969-06-01), Rice
patent: 3797140 (1974-03-01), McWilliams et al.

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