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US 4,107,257 AGranted
Method for molding dynamically balanced fans
OwnerRichard E. Swin, Sr.inventor
Life of this patent
Estimating the term…
Abstract
A method of manufacture of dynamically balanced molded plastic air movement devices wherein material may be readily added or deleted from inactive surface portions of the air movement devices during manufacture by adjustable pins accessable from the front or face of a mold half.
Claims2
In the method of injection molding dynamically balanced plastic air movement devices wherein mold halves having complementary faces forming a mold cavity in the configuration of an air movement device are injected with plastic material to form an air movement device in the configuration of the mold cavity, the improvement comprising
- inserting a plurality of selectively extendable plugs into one of the mold halves to form balancing pads of plastic material on the air movement device at predetermined positions to effect dynamic balancing thereof, and
- adjusting said selectively extendable plugs from the face of said mold half to vary the quantity of plastic material forming said balancing pads.
Dependencies are inferred from the claim text.