Classifying – separating – and assorting solids – Sifting – Elements
Patent
1975-12-16
1977-08-09
Halper, Robert
Classifying, separating, and assorting solids
Sifting
Elements
209399, B07B 142
Patent
active
040409511
ABSTRACT:
Two arrangements for retaining a screen in and on a shaker frame are shown. Both arrangements provide apparatus for the ready removal and replacement of the screen in the shaker frame. The first arrangement provides apparatus for screens having one-quarter inch and larger openings. In this apparatus a multiplicity of T-bolts is employed. The heads of these T-bolts cover two or three screen openings while the shanks of the bolts pass through an opening in the screen without damage. The threaded ends of these bolts are turned into the threaded portions of T-nuts whose head portions are slidably carried on a rectangular bar disposed transversely of the frame. There is a plurality of these transverse bars each of whose ends is actuated up or down by a toggle mechanism. When the bars are moved downwardly by the toggle mechanisms the T-bolts which are retained by the T-nuts snugly retain the screen on fixed ribs on the screen frame. For screens with smaller openings a second apparatus is provided. In this arrangement the transverse bars are disposed above the screen. On these bars are carried depending arms which terminate with pad members which press and retain the screen on and to the ribs of the shaker frame. These transverse rods are secured to and are moved toward and away from the screen by toggle mechanisms. In the down position the toggle mechanisms push the pad members into screen holding condition. In the up condition the pad members are lifted and maintained a few inches above the screen so that the screen is free for removal and replacement.
REFERENCES:
patent: 1103862 (1914-07-01), Bennett
patent: 2036607 (1953-04-01), Roubal
patent: 2190993 (1940-02-01), Muir
patent: 2477123 (1949-07-01), Gilson
patent: 2706932 (1955-04-01), Smith
patent: 2899061 (1959-08-01), Schluth
patent: 3087617 (1963-04-01), Forsberg
patent: 3282423 (1966-11-01), Mitchell
Halper Robert
Roberts Ralph R.
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