Torque overload indicator

Details Torque overload indicator Torque overload indicator

1981-09-18

1984-06-12

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

7386231, 340679, G08B 2100

Patent

active

044545045

ABSTRACT:
A device is provided for use with an actuator having an actuator shaft which indicates when the torque on the actuator shaft exceeds a predetermined limit. The device comprises a housing which carries a pair of limit switches. A shaft extension is operatively connected with the actuator shaft so that axial force on the actuator shaft, which is proportional to the shaft torque, is transmitted to the shaft extension. A hub and Belleville washer arrangement translates the axial force on a shaft into a proportional axial movement of the hub while a radially extending member from the hub includes a portion positioned adjacent the limit switch. Thus, when the axial force in one direction on the shaft exceeds a first predetermined amount, the radially extending member activates one limit switch which in turn is connected to an indicator. Similarly, when the axial force in the other direction on the shaft exceeds a second predetermined amount, the radially extending member activates the other limit switch which is also connected to the indicator. An adjustable cam is secured to the radially extending member to vary the torque limit at which the limit switch is activated.

REFERENCES:
patent: 2503141 (1950-04-01), Stone
patent: 4182168 (1980-01-01), Desch

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