The Babcock & Wilcox Company

Bailey Meter Company

Jack M White

George R Hall, Ii

Roger L Krechmery

A beam assembly for a force transducer of the type which includes a tapered beam portion having one or more strain gauges attached thereto. The beam assembly is in the form of a one-piece cylindrical member having an L-shaped slot formed therethrough to define a beam portion to which said strain gauge is attached, and a lever portion. A first force transmitting strut is attached to the beam portion and a second force transmitting strut is attached to the lever portion.

Cylindrical force transducer beam

A force transducer for producing an output signal in proportion to the magnitude of an input force wherein an equal and opposite force is produced by a flexure assembly comprised of a compound leaf-spring flexure having opposed outer sections, anchored in and cantilevered from a fixed and a movable base respectively, which gradually decrease in cross-sectional area to a thin middle section wherein the movable base is constrained to linear displacement from a null or neutral position by having the force applied along a line normal to and passing through the center of the thin middle section and transmitted to the movable base through a rigid connection. A modified form of flexure assembly is disclosed comprised of parallel compound flexures each having a thin middle section and opposed outer sections which are anchored in and cantilevered from a fixed common base and a movable common base.

Force transducer

A pressure sensitive Silicon chip is indirectly bonded to a Stainless Steel housing of an electronic pressure transmitter through an intermediate holder assembly. This indirect bonding prevents thermal cracking of the Silicon chip due to the difference in thermal expansion of the Stainless Steel housing and the Silicon chip. The holder assembly includes a Borosilicate glass tube having the Silicon chip bonded thereto which tube is soldered to a Nickel-Iron alloy holder by a eutectic alloy solder. In assembly, the Nickel-Iron holder is first brazed to the stainless Steel housing at a first temperature greater than the maximum non-destructive temperature of either the chip or the glass tube and the glass tube is then soldered to the Nickel-Iron holder at a lower temperature which will not destroy the chip or the tube holder.

Growing community of inventors

Novelty, OH, United States of America

Jack M White