Patent ID: 7303103

Claim:
An arresting mechanism for a nail gun, wherein the nail gun comprises a magazine, a nailing mechanism including a trigger mechanism with at least one retaining part; the arresting mechanism arranged to jam the retaining part of the trigger mechanism so as to prevent the trigger from cocking and firing when there are no nails in the magazine; the arresting mechanism comprising: a cotter having an axial length and defining a convex portion therealong, the cotter arranged for axial sliding movement in the nailing mechanism; the cotter having a cotter head at one end thereof; a sensing component arranged outwardly of the magazine and operatively connected therein so as to determine whether or not there is at least one nail in the magazine; the sensing component provided with a lever arm in operative contact with the cotter head and arranged to press thereon to constrain the cotter in a firing mode when there is at least one nail in the magazine, the lever arm arranged to cease pressing on the cotter head allowing the cotter to move to a non-operable mode when there are no nails in the magazine; a resilient member operatively arranged to move the cotter axially when there are no nails in the magazine from the firing mode to the non-operable mode; the convex portion of the cotter arranged to be clear of the retaining part of the trigger mechanism to produce the firing mode, but to move the convex portion of the cotter axially into jamming contact with and to arrest the retaining part of the trigger mechanism to produce the non-operable mode.