Torque overload indicator

For use with an actuator having an actuator shaft, a device for indicating when the torque on said actuator shaft exceeds a first or second limit comprising:

• a housing,
• a first limit switch and first means for attaching said first limit switch to said housing,
• a second limit switch and second means for attaching said second limit switch to said housing,
• means movable in an amount proportional to the torque on the actuator shaft,
• means carried by said movable means for activating said first limit switch when said torque exceeds said first limit and for activating said second limit switch when said torque exceeds said second limit, said activating means including means for varying said first limit, and
• means for indicating activation of said limit switches.

For use with an actuator having an actuator shaft, a device for indicating when the torque on said actuator shaft exceeds a limit comprising:

• a housing,
• a limit switch and means for attaching said limit switch to said housing,
• means movable in an amount proportional to the torque on the actuator shaft,
• means carried by said movable means for activating said limit switch when said torque exceeds said limit, said activating means including means for varying said limit,
• means for indicating activation of said limit switch, and
• wherein said attaching means comprises means for pivotally mounting said limit switch to said housing between a first and a second pivotal position and means for urging said limit switch towards its first pivotal position.

For use with an actuator having an actuator shaft, a device for indicating when the torque on said actuator shaft exceeds a limit comprising:

• a housing,
• a limit switch and means for attaching said limit switch to said housing,
• means movable in an amount proportional to the torque on the actuator shaft,
• means carried by said movable means for activating said limit switch when said torque exceeds said limit, said activating means including means for varying said limit, and
• means for indicating activation of said limit switch,
• a shaft extension coaxially secured to said shaft against axial movement and,
• wherein said movable means comprises a hub secured to said shaft extension, a first compressible member slidably mounted to said shaft extension and sandwiched between one end of said hub and said housing, a second compressible member slidably mounted to said shaft extension and sandwiched between the other end of said hub and said housing.