Adjustable grating pain rock sifter

Details Adjustable grating pain rock sifter Adjustable grating pain rock sifter

1998-08-05

2000-03-28

Walsh, Donald P

Classifying, separating, and assorting solids

Sifting

Elements

209392, 209421, B07B 149

Patent

active

060419431

ABSTRACT:
A sorting apparatus includes a first grating of spaced parallel bars and a second grating of spaced parallel bars positioned parallel to the first grating. Relative lateral movement of the first grating and the second grating alters the lateral spacing between the parallel bars of the first grating in relation to the parallel bars of the second grating. This enables rocks to be sorted into three piles; a first pile of rocks that will pass through when openings in the first grating and second grating are out of register, a second pile of rocks that will pass through only when openings in the first grating and second grating are in register, and a third pile of rocks that will not pass through.

REFERENCES:
patent: 2484318 (1949-10-01), Smith
patent: 2734686 (1956-02-01), Oberhellmann
patent: 3280977 (1966-10-01), Looker
patent: 3477573 (1969-11-01), Andersson
patent: 3805952 (1974-04-01), Pleus

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