Pair of step bar elements for an inclined walking beam-type bar screen employed in wastewater filtration

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Description

FIG. 1 is a top, front and left side perspective view of a pair of step bar elements for an inclined walking beam-type bar screen employed in wastewater filtration showing my new design;

FIG. 2 is a front elevational view thereof, the rear being generally similar in appearance;

FIG. 3 is a top, front and left side perspective view of one element thereof, the side opposite being a mirror image;

FIG. 4 is a front elevational view of the element of FIG. 3;

FIG. 5 is a top, front and left side elevational view of the adjacent element thereof, the side opposite being a mirror image; and

FIG. 6 is a front elevational view of the element of FIG. 5.

Referenced Cited
U.S. Patent Documents
546415 September 1895 Compton
1698387 January 1929 Broome
1773576 August 1930 Downes
2963156 December 1960 Nordell
3093580 June 1963 Siewert
4289619 September 15, 1981 Sampson
4447323 May 8, 1984 Jackson
Patent History
Patent number: D299155
Type: Grant
Filed: Nov 19, 1985
Date of Patent: Dec 27, 1988
Assignee: Hydropress Wallander & Co. AB (Goteborg)
Inventor: Carl O. Wallander (Vastra Frolunda)
Primary Examiner: Wallace R. Burke
Assistant Examiner: Brian N. Vinson
Law Firm: Cushman, Darby & Cushman
Application Number: 6/805,925
Classifications
Current U.S. Class: Treatment (D23/207)