Electromagnetic stapler and safety trigger therefor

A staple driving tool comprising a body, a load coil in said body, said coil having an opening, armature means disposed in said body and slidable in said opening for movement by said coil when the coil is energized, staple driving means fixed to said armature means and disposed at the front of the body, a staple magazine at the lower end of said body, a switch on said body, control circuit means interconnecting line current supply to said coil and switch, said control circuit means comprising means to energize said coil to a charge so that said staple driving action is at the desired force, and further comprising time delay pulse means so that the time delay pulse between shots is greater than the time to disengage the switch, a trigger, said trigger comprising a housing, a trigger member slidably engaging said housing and being depressable by the user in relation to the housing, motion responsive means adjacent said trigger to transmit the depressing motion to actuate the switch for completing the control circuit means, said motion responsive means being movably mounted to said housing whereby upon movement of said armature means, said armature means strikes said motion responsive means so as to disengage said motion responsive means from said switch while said trigger is in the depressed condition, whereby depression of said trigger actuates said switch causing the staple driving action only at the desired force and whereupon disengagement of the switch by the staple driving action, the switch opens the control circuit means so as not to energize the coil until the trigger is again depressed.