A tool for installing an explosively driven fastener, the fastener including a nail, an explosive load attached to the nail, and a separate bracket, the tool comprising:
- a receiver having a proximal end and a distal end;
- a firing pin plunger located within the receiver, the firing pin plunger having a proximal end and a distal end;
- a firing spring arranged to bias the firing pin plunger toward the distal end of the receiver;
- a firing pin, the firing pin having a proximal end and a distal end, the distal end being pointed, the firing pin being separate from the firing pin plunger, the proximal end of the firing pin being removably coupled to the distal end of the firing pin plunger;
- a muzzle assembly having a proximal end and a distal end, the proximal end arranged to receive the firing pin and the distal end arranged to receive the nail and explosive load, and a portion of the bracket, such that when the fastener is placed on the distal end of the muzzle assembly and the firing pin plunger is biased toward the distal end of the receiver by the firing spring, the firing pin strikes the explosive load causing the explosive load to explode and drive the nail out of the muzzle assembly, and
- a spall shield surrounding the distal end of the muzzle assembly and having a distal end coplanar with the distal end of the muzzle assembly, said-spall shield carrying a magnet that has a distal endface that is coplanar with the distal end of the spall shield for magnetically attaching to a portion of the bracket to locate the bracket until the firing pin strikes the explosive load,
- wherein the spall shield has a has a cutaway section removed to provide a flat side face to accommodate the bracket,
- wherein the distal end of the muzzle assembly defines a distal annular endface and the magnet is positioned between the distal annular endface of the muzzle assembly and the flat side face of the spall shield,
- said tool further comprising an inner sleeve coaxially mounted within the receiver, said inner sleeve having a proximal end and a distal end, an inner sleeve spring biasing the inner sleeve away from the receiver, and a first annular spacer between the distal end of the inner sleeve and the proximal end of the muzzle assembly,
- said tool further comprising a firing pin guide extending into the receiver, the inner sleeve and the muzzle assembly;
- the firing pin guide having an outer flange;
- and the inner sleeve having an inner flange engageable by the outer flange;
- a trigger plunger and a trigger spring mounted transversely in the firing pin plunger, the trigger plunger being biased radially outward from within the firing pin plunger;
- wherein the firing pin guide has a slot extending from a proximal end thereof and a widened area in the slot to receive the trigger plunger, and the receiver has an internal trigger shoe receivable by the slot to depress the trigger plunger by sliding over it;
- wherein
- when the tool is in a first resting position, the trigger plunger rests in the widened area of the slot thereby limiting distal movement of the firing pin,
- and when the tool is in a second firing position, the trigger shoe depresses the trigger plunger out of engagement with the firing pin guide and allows distal movement of the firing pin under-action of the firing spring,
- wherein the receiver has a sidewall extending between the proximal end and the distal end thereof, said receiver defining a transverse borehole extending though the sidewall, said tool further comprising a safety blocking element mounted for radial movement in the borehole to selectively block the firing pin guide from proximal movement, wherein the safety blocking element when blocking the firing pin guide prevents the firing pin guide from moving sufficiently proximally for the trigger plunger to be depressed by the shoe,
- said tool further comprising an outer sleeve mounted on the receiver, said outer sleeve having a longitudinal axis, said outer sleeve having an outwardly protruding portion defining a radially outwardly protruding, longitudinally extending ridge having a borehole extending transversely therethrough, said tool further comprising a cam mounted in the borehole, and an arm on one end of the cam to permit a 90 degree rotation of the cam, so that the cam depresses the safety blocking element and prevents the firing pin guide from moving sufficiently proximally for the trigger plunger to be depressed, said outer sleeve defining a longitudinally extending inner slot, wherein the cam extends across the inner slot.