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US 4,541,495 AGranted
Weighing apparatus of the vibratory string type
AssigneeMettler Instrumente AG
InventorsErnst Willi, Hans-Ulrich Fluckiger
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AssigneeMettler Instrumente AG
InventorsErnst Willi, Hans-Ulrich Fluckiger
Estimating the term…
A weighing apparatus of the vibratory string type is disclosed, wherein a current-carrying string connected intermediate its ends between a movable load-responsive member and a frame vibrates in a magnetic field produced by a permanent magnet mounted on the frame. The ends of the string extend beyond the clamping connections with the movable member and the frame, respectively, for electrical connection with the conductors to the string drive and load detection circuit. This driving and detection circuit and the aforementioned conductors are mounted on a printed circuit board that is connected with the frame, thereby to avoid the need of a separate power supply with its disadvantageous effect on string vibrations. In one modification, the protruding string end associated with the movable member comprises a tension spring for prestressing the string.
Weighing apparatus of the vibratory string type, comprising
In a weighing apparatus of the vibratory string type including a frame (1), a movable load transmitting member (2) connected for movement relative to the frame, a string (9) connected between said frame and said movable member, and means (19) for vibrating said string and for detecting variations in the string frequency as a function of the load applied to said movable member,
Dependencies are inferred from the claim text.