Precision cut-off weighing apparatus

Details Precision cut-off weighing apparatus Precision cut-off weighing apparatus

1975-06-06

1976-06-01

Hartary, Joseph W.

Weighing scales

With alarm or signal

In balance

128214E, 177116, 177DIG5, 200 85R, 251 9, A61B 514, G01G 1330

Patent

active

039602249

ABSTRACT:
A precision cut-off weighing apparatus having a balance type weighing device on which a desired weight is placed on one side and a bag to be filled with a fluid such as blood on the other. A magnet is mounted on the arm of the balance on which the bag is placed and a reed switch in a circuit mounted in proximity of the magnet to be influenced to close the circuit when the arm swings to the balanced position and bag has been filled to substantially the exact weight desired. The circuit is connected to a lever mounted on a support through which a tube extends to the bag whereby when the reed switch has been actuated, the lever swings to compress the tube and thereby prevent any further flow of fluid to the bag.

REFERENCES:
patent: 3263760 (1966-08-01), Waller
patent: 3335753 (1967-08-01), Kiser
patent: 3557789 (1971-01-01), Poitras
patent: 3698494 (1972-10-01), Gaudin
patent: 3778808 (1973-12-01), Stevens

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