Fluid reaction surfaces (i.e. – impellers) – Protective screen or guard – Water or marine propellers
Patent
1976-04-02
1977-05-10
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Protective screen or guard
Water or marine propellers
415121G, 417411, F04D 2932
Patent
active
040225488
ABSTRACT:
The open wire grid safety guard enclosure for a fan and its motor is rectangular box-like in shape and is made up of two substantially identical halves.
Each half is made from identical cruciform blanks of grid mesh wires with parallel closely spaced wires extending in one direction and connected by more widely spaced cross wires, including marginal cross wires at the ends of the arms of the cross form. The arms of the cross form are bent inwardly of the box form through an angle of about 105.degree. from the planes of the centers of the blank. Hinge means connect the opposed marginal wires along one side edge of the box and are recessed inwardly of the planes of the outer edges of the sides by the angle of the bent arms. Releasable latch means connect other marginal wires at points spaced from the side with the hinge means. A plate welded to the center of one side of the box carries supporting connections to a fan motor and fan blade enclosed in the box. A hanger loop releasably connects the adjacent edges of the box opposite the hinge means.
REFERENCES:
patent: 2345516 (1944-03-01), Weber
patent: 2617583 (1952-11-01), Kemler
patent: 2624504 (1953-01-01), Viewegh
patent: 2728519 (1955-12-01), McLarty
patent: 3725640 (1973-04-01), Kunz
patent: 3787142 (1974-01-01), Dupke
Des. 135,211 3-1943, Weber, (U.S. Design Patent).
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