Overload protection for a weigh scale having a flexure beam
First Claim
1. A weigh scale comprising a base, a platform, a pair of pivot members, a single beam connected between the pivot members and having a central portion of reduced cross sectional area with a group of strain gauges mounted thereon, load transmitting means for deflecting the beam about the pivot members as a function of a load placed on the platform to create strain in the central portion thereof which is sensed by said strain gauges, and overload protection means directly adjacent opposite sides of the central portion of the beam between said pivot members for limiting the amount of deflection of the central portion of the beam to prevent yielding thereof upon experiencing excessive loads.
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Accused Products
Abstract
A weigh scale includes a flexure beam disposed between a platform and the base. Load transmitting devices operate to deflect the beam as a function of the load placed on the platform. Overload protection is provided for the beam to restrict the amount of beam deflection to maintain it within its elastic limits to thereby prevent yielding of the beam.
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Citations
12 Claims
- 1. A weigh scale comprising a base, a platform, a pair of pivot members, a single beam connected between the pivot members and having a central portion of reduced cross sectional area with a group of strain gauges mounted thereon, load transmitting means for deflecting the beam about the pivot members as a function of a load placed on the platform to create strain in the central portion thereof which is sensed by said strain gauges, and overload protection means directly adjacent opposite sides of the central portion of the beam between said pivot members for limiting the amount of deflection of the central portion of the beam to prevent yielding thereof upon experiencing excessive loads.
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9. A weigh scale comprising:
a rigid base having a unitary bottom portion serving as a lower enclosure member for the scale, a platform spaced from and generally coextensive with the base, first and second pivot members disposed between the base and the platform, a single beam connected between the pivot members and having a central portion of reduced cross sectional area, load transmitting means for producing moments in the pivot members to deflect the beam and create strain in the central portion thereof as a function of loads applied to the platform, sensor means carried by said central portion of the beam for producing a signal relating to the strain developed in the central portion of the beam, a pair of bosses integrally formed with the base and projecting from the bottom portion thereof, said bosses being aligned with the beam directly adjacent opposite sides of the central portion of the beam on either side of said sensor means, each boss having a centrally tapped hole, a pair of screws having a head portion and a shaft portion for engaging the holes in their respective bosses, whereby said screws and bosses cooperate to provide overload protection for the central portion of the beam to prevent damage thereof upon experiencing excessive loads. - View Dependent Claims (10, 11, 12)
Specification