Abstract: 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.

Abstract: Weighing apparatus is disclosed of the short-stroke vibratory string type including a housing (3, 5) in which is arranged a load cell device including a stationary member (1) and a vertically movable load receiving member (2), characterized by the provision of a vertically collapsible overload protection device (F) arranged within the housing around the stationary load cell member for connecting a weighing platform or pan (6) arranged above the housing with the movable load receiver member. The overload protection device includes a horizontal open rectangular frame having relatively vertically movable upper (7) and lower (8) frame sections, stop lugs (23) being provided on the housing for limiting the extent of downward travel of the upper frame member. A snap spring arrangement (14, 18) is provided for biasing the upper and lower frame members vertically apart.