Strain gauge transducer assembly

A strain gauge transducer assembly comprising:

• a bolt having a central axis and including a head having a counterbored hole extending therethrough along the central axis of the bolt;
• said counterbored hole including a threaded inner portion, an intermediate portion extending outwardly from the threaded inner portion, an outer portion of a larger size than the intermediate portion, and an outwardly facing surface that extends between the intermediate and outer portions in a perpendicular relationship to the central axis;
• a transducer received within the counterbored hole of the bolt;
• said transducer including a body having a central axis coaxial with the central axis of the bolt and including a threaded inner end threaded into the inner portion of the counterbored hole;
• said transducer body also including an outer end having an enlarged head;
• an annular seat on the head facing axially toward the inner end extending in a perpendicular relationship to the central axis thereof in engagement with the outwardly facing surface of the counterbored hole in the bolt;
• a wire passage extending axially through the head;
• the transducer body also including an intermediate portion having a web that connects the inner and outer ends thereof and has oppositely facing parallel surfaces;
• said web having a thickness in the range of about 0.020 to 0.060 of an inch and also having a width that is a plurality of times the thickness thereof and less than the diameter of the threaded inner end;
• at least two strain gauges each of which is mounted on one of the web surfaces to sense deformation of the web;
• and wires connected to the strain gauges and extending through the wire passage of the head to permit sensing of the web deformation and stress of the bolt.

A strain gauge transducer assembly comprising:

• a bolt having a central axis and including a head having a counterbored hole extending therethrough along the central axis of the bolt;
• said counterbored hole including a threaded inner portion, an intermediate portion extending outwardly from the threaded inner portion, an outer portion of a larger size than the intermediate portion, and an outwardly facing surface that extends between the intermediate and outer portions in a perpendicular relationship to the central axis;
• a transducer received within the counterbored hole of the bolt;
• said transducer including a body having a central axis coaxial with the central axis of the bolt and including a threaded inner end threaded into the inner portion of the counterbored hole;
• said transducer body also including an outer end having an enlarged head;
• said enlarged head having an annular seat that faces toward the inner end thereof extending perpendicular to the central axis thereof in engagement with the outwardly facing surface of the counterbored hole in the bolt;
• the transducer body also including an intermediate portion having a web that connects the inner and outer ends thereof and has oppositely facing parallel surfaces;
• said web having a width less than the diameter of the threaded inner end and a thickness in the range of about 0.020 to 0.060 of an inch;
• at least two strain gauges each of which is mounted on one of the web surfaces to sense deformation of the web;
• a wire passage through one end of the transducer body;
• and wires connected to the strain gauges and extending through the wire passage to permit sensing of the web deformation and stress of the bolt.

A strain gauge transducer assembly comprising:

• a bolt having a central axis and including a head having a counterbored hole extending therethrough along the central axis of the bolt;
• said counterbored hole including a threaded inner portion, an intermediate portion extending outwardly from the threaded inner portion, an outer portion of a larger size than the intermediate portion, and an outwardly facing surface that extends between the intermediate and outer portions in a perpendicular relationship to the central axis;
• a transducer received within the counterbored hole of the bolt;
• said transducer including a body having a central axis coaxial with the central axis of the bolt and including a threaded inner end threaded into the inner portion of the counterbored hole;
• said transducer body also including an outer end having an enlarged head;
• said enlarged head having an annular seat of a flat shape facing axially toward the inner end and extending in a perpendicular relationship to the central axis thereof in engagement with the outwardly facing surface of the counterbored hole in the bolt;
• a wire passage extending axially through the head of the transducer body;
• the transducer body also including an intermediate portion having a web that connects the inner and outer ends thereof and has oppositely facing parallel surfaces;
• said web having a width less than the diameter of the threaded inner end and a thickness in the range of about 0.020 to 0.060 of an inch;
• at least two strain gauges each of which is mounted on one of the web surfaces to sense deformation of the web and stress of the bolt;
• and wires connected to the strain gauges and extending through the wire passage to permit sensing of the deformation.

A strain gauge transducer assembly comprising:

• a bolt having a central axis and including a head having a counterbored hole extending therethrough along the central axis of the bolt;
• said counterbored hole including a threaded inner portion, an intermediate portion extending outwardly from the threaded inner portion, an outer portion of a larger size than the intermediate portion, and an outwardly facing surface that extends between the intermediate and outer portions in a perpendicular relationship to the central axis;
• a transducer received within the counterbored hole of the bolt;
• said transducer including a body having a central axis coaxial with the central axis of the bolt and including a threaded inner end threaded into the inner portion of the counterbored hole;
• said transducer body also including an outer end having an enlarged head;
• said enlarged head having a wrench socket opening and also having an annular seat that faces toward the inner end thereof extending perpendicular to the central axis thereof in engagement with the outwardly facing surface of the counterbored hole in the bolt;
• an axial groove defining a wire passage through the head of the transducer body;
• the transducer body including an intermediate portion having inner and outer round portions respectively connected to the inner and outer ends and also having a web that extends between the inner and outer round portions and has oppositely facing parallel surfaces;
• said web having a width less than the diameter of the threaded inner end and a thickness in the range of about 0.020 to 0.060 of an inch;
• at least two strain gauges each of which is mountd on one of the web surfaces to sense deformation of the web;
• and wires connected to the strain gauges and extending through the wire passage to permit sensing of the web deformation and stress of the bolt.