Lockout device

A lockout device configured to be lockingly secured to an external structure extending in an axial direction, to block access to the external structure, the lockout device comprising:

• a housing defining an opening sized to receive the external structure;
• at least one gripping member disposed within the housing and positioned to receive the external structure, the at least one gripping member being movable in the axial direction between a first position in which internal surfaces of the housing urge the at least one gripping member into gripping engagement with the external structure, and a second position in which the internal surfaces of the housing allow the at least one gripping member to expand to release the external structure;
• a driving member assembled with the housing and operatively connected with the at least one gripping member for movement of the at least one gripping member between the first and second positions;
• and
• an actuator assembled with the housing and movable in the axial direction between a first position in which actuator engages the driving member for user operation of the driving member, and a second position in which the actuator disengages the driving member to prevent user operation of the driving member.