Load sensing structure for weighing apparatus
AssigneeRevere Corporation of America
InventorWalter E. Jacobson
Life of this patent
Estimating the term…
Abstract
A load sensing structure for weighing has a rectangular deck with four flexure members supporting the deck. Each flexure member has attachment portions secured to the deck and oppositely facing attachment portions secured to a fixed platform. U-shaped flexure intermediate portions have parallel legs or beams that are connected to one another by a rigid base of the U, and these legs are also cantilever connected to the attachment portions. Two strain gages on one such leg are so located that these gages must sense tension and compression to indicate weight in the bridge circuit. If both detect tension or both compression no weight indication will occur.
Claims18
A load sensing structure including a platform and a planar deck provided in spaced parallel relationship to the platform, at least one strain sensitive flexure member having oppositely facing attachment portions and an intermediate portion therebetween, one said attachment portion fixedly connected to said platform and capable of absorbing forces having components parallel said platform, an oppositely facing attachment portion fixedly connected to said deck and capable of absorbing forces having components parallel said deck, said intermediate portion having a generally U-shape with generally parallel flexure legs connected in cantilever fashion to said attachment portions respectively, said legs extending away from said attachment portions in generally parallel relationship to one another, said intermediate portion having a generally rigid base, said base connecting the ends of said cantilevered flexure legs to one another so that said legs are also cantilever mounted to one another by said base.
A weighing apparatus comprising a fixed platform and a planar deck provided in spaced relationship to said platform
- at least four flexure members provided in a rectangular pattern and each flexure member having one attachment portion rigidly connected to said platform, each flexure member having an oppositely facing attachment portion rigidly connected to said deck, and an intermediate portion of U-shape with generally parallel flexure legs, each of said legs extending cantilever fashion from an associated attachment portion, and said U-shaped intermediate portion having a rigid base connecting said legs to one another in cantilever fashion,
- two strain gages on at least one leg of each flexure member, one gage provided adjacent one said attachment portions, and a second gage adjacent said rigid base, and
- electric bridge circuit means including said strain gages for indicating changes in the resistivity thereof.
A weighing apparatus including a platform and a deck spaced above the platform, at last two strain sensitive flexure members supporting the deck, each member having attachment portions, one attachment portion being rigidly connected to said platform and a second attachment portion rigidly connected to said deck, each said flexure member having legs oriented parallel said deck, each flexure member including a lower leg having one end supported cantilever fashion at said one attachment portion so that the neutral axis of said lower leg one end remains parallel to said platform under load imposed on said deck, each flexure member including an upper leg having one end supported cantilever fashion at said second attachment portion so that the neutral axis of said upper leg one end remains parallel to said deck under loads imposed on said deck, said flexure member legs having ends opposite to said one ends, and means rigidly connecting said opposite ends of said upper and lower flexure legs to one another so that the neutral axes of said flexure legs remain parallel to one another under loads imposed on said deck.
Dependencies are inferred from the claim text.