Patent ID: 8561482

Claim:
A sealed strain gauges transducer of the test body type, comprising: a one piece test body ( 1 ) formed as a simple deformable parallelogram with a first end ( 1 a ) attachable to a frame and a second end ( 1 b ) equipped to accommodate a load plate, the test body having an upper face and a lower face, the one piece test body ( 1 ) further comprising only one central recess ( 2 ) with four arms defining a general shape of an H or an X transversely crossing the test body, four hinges (a, b, c, d), a position and a thickness of each of the four hinges being defined by the central recess, each of the four hinges (a, b, c, d) being located between an end of a respective arm of the recess ( 2 ) and the upper and lower faces of the test body ( 1 ), two of the hinges being located nearer the upper face of the test body and two of the hinges being located nearer the lower face of the test body, at least one of the hinges (a, b, c, d) is a measure hinge, a first hollow ( 5 ) and a housing ( 8 ) with a circumference and opening to the upper face of the test body ( 1 ) with a strain gauge attached to a bottom of the first hollow ( 5 ) facing the measurement hinge and associated electrical circuits located in the housing ( 8 ), the hollow ( 5 ) being located over the measure hinge ( 5 ), a passage ( 15 a ) connecting the housing ( 8 ) to an outside of the test body ( 1 ) accommodating a sealed cable passage, a pair of side cavities ( 12 ) defining therebetween a width of the measure hinge ( 5 ) and a thickness of webs of material ( 13 ) connecting side edges of the measure hinge ( 5 ) to side edges of the test body ( 1 ) corresponding to the measure hinge ( 5 ) in such a way to prevent strains caused in the measure hinge ( 5 ) from being affected by strains originating from said side edges of the test body ( 1 ), and at least one metallic cover ( 11 ) welded along the circumference of the first hollow ( 5 ) and the housing ( 8 ) and tightly sealing the hollow ( 5 ) and the housing ( 8 ).