Abstract: A sliding weight scale includes a recirculating ball spindle mounted in a balance beam arranged to pivot about a swivel axis. The spindle extends perpendicularly of the swivel axis. A sliding weight is engaged via a nut with the spindle. A gear wheel is fixed to the spindle and is driven by another gear wheel fixed on the base plate of the scale. A hand wheel drives an intermediate gear assembly which, in turn, drives the gear wheels and the spindle. The gear wheels driving the spindle are located in a vertical plane containing the swivel axis of the balance beam. By the use of the recirculating ball spindle, the displacement forces acting on the sliding weight are kept small so that dimensional variations occurring in manufacturing and assembly have a negligible effect on the weighing accuracy of the scale.

Abstract: An automatic sliding-weight scale arrangement with a hinge-supported scale beam. A continually motor-driven friction drive moves a sliding weight along the scale beam. The friction drive has at least two frictional elements, one of which is attached to the frame, and the other is attached to the scale beam. One of the frictional elements, furthermore, is supported exclusively by one or several rotary friction units and is displaceable in a rotationally and lengthwise manner for moving the sliding weight. A lengthwise displaceable friction roller is supported by a rotary friction unit located vertically underneath it, as well as by a rotary friction element on one side and an additional friction unit on the opposite side. Two of the friction units are mounted on the scale beam, and the friction element is mounted on the frame. The friction unit may be in the form of two coaxially-spaced friction disks of the same size.