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US 4,496,086 AGranted
Devices which comprise a helical spring used as conveying, extracting, quantity-controlling or mixing means
AssigneePari-Symac
InventorPierre Duchadeau
Life of this patent
Estimating the term…
Abstract
A rotating helical coiled spring for conveying, extracting, quantity-controlling or mixing particulate products. A supple material such as a brush is attached to the periphery of the spring and brushes against a rigid wall or tube as the spring is rotated thereby propelling the particulate product in a direction generally parallel to the axis of the spring.
Claims6
In a conveying, extracting, quantity-controlling or mixing apparatus having a rotating helical spring moving with respect to a rigid wall, the improvement comprising:
- a helical brush member of outwardly extending supple filaments which are gripped by one of their ends in a helical member of U-shaped cross-section which is fixed laterally on the helical spring and presents the free ends of the supple filaments in contact with the rigid wall.
Dependencies are inferred from the claim text.