US 4,050,532 AGranted

Platform type weighing scale

AssigneeThe Brearley Company

InventorsMike A. Provi, S. Robert Guinter

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Abstract

A platform type weighing scale including a base and a scale platform and first and second pairs of platform suspensions for mounting the platform on the base at the four corners of a generally rectangular pattern, an elongated load sensing beam supported at spaced points therealong on the base, and first and second transfer means respectively interconnecting the first and second pairs of platform suspensions to the beam at a common point intermediate the spaced beam suspension points to apply a bending load to the beam correlative with the sum of the loads applied to the first and second pairs of platform suspensions, and electrical strain gauge means mounted on the load sensing beam for producing an electrical signal correlative with the bending stress produced in the beam as an indication of the total weight applied to the scale platform.

Claims14

Dependent claims

In a platform type weighing scale including a base and a scale platform, first and second pairs of platform suspension for mounting the platform on the base at the four corners of a generally rectangular pattern, an elongated bendable load sensing beam, first and second beam suspensions engagin the beam at first and second spaced points therealong and supporting the beam on the base, a first means interconnecting said first pair of platform suspensions to each other and to the bendable load sensing beam at a third point thereon intermediate said first and second points to apply a first force to the beam at said third point in one direction transverse to the length of the beam and correlative with the sum of the loads applied to said first pair of platform suspensions, a second means interconnecting said second pair of platform suspensions to each other and to the bendable load sensing beam at said third point thereon to apply a second force to the beam at said third point in said one direction transverse to the length of the beam and correlative with the sum of the load applied to said second pair of platform suspensions, and electrical strain gauge means mounted on said load sensing beam for producing an electrical signal correlative with the bending stress produced in said beam by the sum of said first and second forces acting thereon at said third point on the beam.

In a platform type weighing scale including a base and a scale platform, first and second rigid torque memers disposed between the base and platform, first and second pairs of base suspension means respectively supporting the first and second torque members adjacent the ends thereof on the base and first and second pairs of platform suspension means respectively supporting the platform on the first and second torque members adjacent the ends thereof to produce turning moments of opposite sense in the first and second torque members, first and second arms respectively rigid with said first and second torque members and extending tranverse thereto and terminating with their free ends in proximity to each other, and means for sensing the forces applied to said first and second arms, the improvement wherein said last mentioned means comprises a bendable load sensing beam, first and second beam suspensions engaging the beam at first and second spaced points therealong and supporting the beam on the base at a location intermediate the torque members, and connecting means connecting the free ends of the first and second arms to said load sensing beam at a common point intermediate said first and second points to apply a force thereto in a direction transverse to the length of the beam correlative with the sum of the loads applied to the first and second pairs of platform suspension means whereby to produce a bending stress in the load sensing beam, and strain gauge means mounted on the load sensing beam intermediate the ends thereof for producing an electircal signal correlative with the bending stress in the beam.

Dependencies are inferred from the claim text.