Importance

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Abstract

A platform weighing scale includes a base with vertical corner stands and a weight supporting platform including depending corner bearings. A weight sensing apparatus is supported on the base corner stands and supports the weight supporting platform so that it is moveable relative to the base. A weight sensing mechanism is responsive to movement of the platform for operating a weight indicating device. The weight sensing mechanism includes a plate operatively associated with the weight indicating device. A pair of primary levers are secured at one end to the plate and diverge therefrom relative to a longitudinal centerline and define a select angle therebetween. Each primary lever includes an upper notch receiving one of the corner bearings and a lower notch receiving one of the corner stands so that movement of the platform causes pivotal movement of the levers to move the plate. A bearing insert is fit to each primary lever between the upper notch and the corner bearing and between the lower notch and the corner stand. Each bearing insert is formed to include a pair of troughs received in the notches for bearing on the corner bearing and corner stand. The troughs are angled relative to the primary levers corresponding to the select angle so that the levers fulcrum about an axis perpendicular to the centerline.

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First Claim