Fluid reaction surfaces (i.e. – impellers) – Protective screen or guard – Water or marine propellers
Patent
1993-03-25
1994-08-30
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Protective screen or guard
Water or marine propellers
4151212, F04D 2970
Patent
active
053421752
ABSTRACT:
A grill for appliances such as, for example, portable electric fans, heaters, humidifiers, radios, etc. The grill may be used to prevent individuals from touching the appliance's internal components while, nevertheless, allowing movement of air and sound therethrough and/or merely for decorative purposes. The grill is made up of a plurality of elongate ribs spaced apart from each other and which define a plurality of slots therebetween. Each rib is shaped having a central peak extending upwardly from side portions located on the right and left sides of the central peak. The central peak and the side portions are connected together via a curvilinear region and, thus, each of the ribs generally have a bell-shape. The ribs each have an outer surface that is coplanar with the fan/heater unit front surface and, thus, define a flat plane outer surface. The flat plane outer surface, in perspective, appears to have depth beyond the flat plane surface.
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Bell & Co., Catalog, 1960, p. 247, Heater A, middle right side of page.
Sun Radio Co., Advertisement brochure, inside page, Thermo-Cool Unit A, top left side of page.
Larson James A.
Look Edward K.
Pappas George
Patton Electric Company, Inc.
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