Platform type weighing scale

In a platform type weighing scale including a base and a scale platform, a unitary weigh frame having an elongated bendable load sensor beam and first and second rigid members rigidly attached to opposite ends of the sensor beam and each defining a pair of arm portions extending laterally from opposite sides of the sensor beam, four frame suspension means mounted on said base at the four corners of a generally rectangular pattern and each engaging a respective one of said arm portions for supporting said weigh frame on the base, four platform suspension means mounted on said platform at the four corners of a generally rectangular pattern and each engaging a respective one of said arm portions for supporting the platform on the weigh frame, the platform suspension means and frame suspension means respectively defining platform and frame pivot supports offset from each other in a direction generally paralleling the length of said sensor beam to apply a bending moment to the sensor beam correlative with the sum of the loads applied to the weigh frame at the four platform suspension means, and electrical transducer means for sensing bending of the sensor beam as an indication of the weight applied to said scale platform, the frame suspension means and platform suspension means associated with each arm portion including a hub member nonrotatably attached to the arm portion and having first and second flexible bands formed integrally therewith at spaced locations therearound, means for attaching the free ends of said first bands to the base to suspend the weigh frame from the base and means for attaching the free ends of the second bands to the platform to suspend the platform from the weigh frame.

In a platform type weighing scale including a base and a scale platform, a unitary weigh frame having first and second relatively parallel torque members and an elongated bendable load sensor beam extending between and rigidly attached to said first and second torque members, a first pair of flexible base suspension members attached to opposite end portions of said first torque member and to said base to pivotally suspend the first torque member on the base, a second pair of flexible base suspension members attached to opposite end portions of said second torque member and to said base to pivotally support the second torque member on the base, a first pair of flexible platform suspension members attached to said platform and to opposite end portions of said first torque member, a second pair of flexible platform suspension members attached to said platform and to opposite end portions of said second torque member, said first and second platform suspension members pivotally supporting the platform on the first and second torque members at locations horizontally offset from the respective first and second base suspension members in directions generally paralleling the sensor beam and equally spaced from a point medially between the ends of the sensing beam, and electrical strain gauge means mounted on the sensor beam for sensing the sum of the bending moments produced in the sensor beam by the first and second torque members, first and second pairs of hub members respectively nonrotatably attached to the ends of the first and second torque members, said hub members each having one of said flexible base suspension members and one of said flexible platform suspension members formed integrally therewith at spaced locations therearound.