Radial arm saw with a depressible key for unlocking a switch-actuating trigger

Claim 1

For use in an electric tool having a hand grip member and a switch for actuating the electric tool, a trigger mechanism, comprising: a trigger member mounted on the handle for movement between an extended switch-deactuated position and a depressed switch-actuating position; means linking the trigger member to the switch so that movement of the trigger member to the depressed switch-actuating position actuates said switch; means biasing said trigger member into said extended, switch-deactuated position; a trigger-locking member pivotally mounted in the handle for movement between a first and a second position, said first position being a trigger-blocking position for preventing movement of the trigger member to the depressed switch-actuating position, and a second position being a trigger release position permitting movement of said trigger member to the depressed switch-actuating position; a removable key adapted to be inserted through a slot in said handle, said first position being an inactive position and said second position being a depressed active position, said key being linearly movable from said inactive position to said active position for engaging a portion of said key with said locking member for pivoting said locking member out of trigger-blocking position whereby said trigger member may be depressed for actuation of said switch.