Switch lock

摘要

A locking device to be mounted in conjunction with a switch arm. The locking device is to be moved between a locking position and a release position. The switch arm is to be movable between "on" position and "off" position. With the locking device is the locking position, the switch arm is prevented from movement from the "off" position to the "on" position. With the locking device in the release position, the switch arm is readily movable between the "on" and "off" position.