Actuators

An actuator arm lock suitable for use with an actuator which has an actuator arm and an actuator body, the actuator arm lock comprising:

• a lock ring suitable for clamping around an actuator arm, the lock ring comprising:
• a circumferentially extending element;
• and
• a locking element;
• wherein the circumferentially extending element comprising:
• first and second element ends and an inner surface which faces towards the actuator arm when the actuator arm lock is in use;
• wherein the circumferentially extending element is configured to partially extend around the actuator arm;
• wherein the locking element comprises first and second locking ends and is configured to extend at least between the first and second element ends of the circumferentially extending element;
• wherein the first locking end of the locking element is engaged with or engageable with the first element end of the circumferentially extending element;
• wherein the locking element is engaged with or engageable with the second element end of the circumferentially extending element;
• and
• wherein the locking element may be reversibly reconfigured between a locked configuration in which the actuator arm lock clamps onto the actuator arm, and an unlocked configuration in which the actuator arm lock is loose on the actuator arm;
• wherein the lock ring further comprises one or more first latch elements, and the first latch elements are configured to reversibly enter a latching engagement with the actuator body;
• wherein the engagement of at least one of the first latch elements with the actuator body is achieved by rotating the lock ring around the actuator arm.