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A fastener driving device including a positioning mechanism for positioning a nail into an opening in a workpiece. The positioning mechanism includes an opening locating structure movably connected to the movable assembly of the contact trip assembly and adapted to extend into the opening so as to a

A fastener driving device including a positioning mechanism for positioning a nail into an opening in a workpiece. The positioning mechanism includes an opening locating structure movably connected to the movable assembly of the contact trip assembly and adapted to extend into the opening so as to align the nosepiece with respect to the opening. The opening locating structure is movable relative the movable assembly of the contact trip assembly between an extended position and a retracted position and biased toward the extended position by a first biasing spring to facilitate locating of the opening, and movable to the retracted position when the opening locating structure is pressed against a workpiece. The positioning mechanism further includes a guiding structure movably connected to the nosepiece structure, the guiding structure being biased by a spring to extend forwardly to guide the fastener in a driving track inside the nosepiece.

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1. A fastener driving device particularly adapted to drive fasteners through openings in an outer workpiece into another workpiece to fasten the workpieces together, said fastener driving device comprising:a housing assembly constructed and arranged to be manually portable, said housing including a

1. A fastener driving device particularly adapted to drive fasteners through openings in an outer workpiece into another workpiece to fasten the workpieces together, said fastener driving device comprising:a housing assembly constructed and arranged to be manually portable, said housing including a nosepiece defining a drive track;a magazine assembly defining a fastener feed track leading to said drive track, said magazine assembly being constructed and arranged to retain a package of fasteners and to feed successively leading fasteners of the fastener package along the fastener feed track and into the drive track;a fastener driving element movable within said drive track and arranged to drive a leading fastener fed to said drive track outwardly thereof into a workpiece during a fastener driving stroke;a power operated system constructed and arranged to move said fastener driving element through successive operating cycles including a fastener driving stroke and a return stroke;an actuating mechanism including a trigger assembly arranged to be actuated by a manual movement and a contact trip assembly arranged to be actuated by a movement of the housing assembly through an actuating stroke toward a workpiece, said actuating mechanism being constructed and arranged to actuate said power operated system in response to a predetermined actuation of said trigger assembly and said contact trip assembly,said contact trip assembly including an actuating structure movable with respect to said housing assembly and cooperating with said trigger assembly, and an opening locating structure movable with respect to said actuating structure constructed and arranged to engage within the opening to initiate the actuating stroke of the housing assembly so that during an initial portion of the actuating stroke both the housing assembly and the actuating structure move with respect to said opening locating structure and during a subsequent portion of the actuating stroke said housing assembly is moved with respect to both said opening locating structure and said actuating structure. 2. The fastener driving device as defined in claim 1,wherein said opening locating structure is spring biased to move with respect to said actuating structure between an extended viewing position and a retracted actuating position, and said actuating structure is spring biased to move with respect to said housing assembly between an extended position and a retracted actuating position. 3. The fastener driving device as defined in claim 2,wherein said opening locating structure is mounted, for movement between said extended viewing position and said retracted actuating position, on a rigid structure forming an adjustable part of said actuating structure, said rigid structure including an annular portion receiving a free end of said nosepiece, said opening locating structure including a tapered element extending in viewing relation from said annular portion when in said extended viewing position. 4. The fastener driving device as defined in claim 3,wherein said annular portion has a fastener guiding member mounted therein for spring biased movement in a direction to engage a fastener being driven and guide it into engagement with said tapered element. 5. An opening locating mechanism for use with a fastener driving device for enabling said fastener driving device to drive fasteners through an opening in an outer workpiece into another workpiece to fasten the workpieces together, the fastener driving device being of the type comprising: a housing assembly constructed and arranged to be manually portable, said housing including a nosepiece defining a drive track; a magazine assembly defining a fastener feed track leading to said drive track, said magazine assembly being constructed and arranged to retain a package of fasteners and to feed successively leading fasteners of the fastener package along the fastener feed track and into the drive track; a fastener driving elemen t movable within said drive track and arranged to drive a leading fastener fed to said drive track outwardly thereof into a workpiece during a fastener driving stroke; a power operated system constructed and arranged to move said fastener driving element through successive operating cycles including a fastener driving stroke and a return stroke; and an actuating structure; said opening locating mechanism including:a rigid structure adapted to be adjustably fixed to said actuating structure for movement therewith, said rigid structure including an annular portion constructed and arranged to receive a free end of the nosepiece therein and a tapered opening locating element mounted on said rigid structure for movement between an extended viewing position extending in viewing relation from said annular portion and a retracted actuating position. 6. The opening locating mechanism as defined in claim 5,wherein said opening locating structure is spring biased to move with respect to said actuating structure between an extended viewing position and a retracted actuating position, and said actuating structure is spring biased to move with respect to said housing assembly between an extended position and a retracted actuating position. 7. The opening locating mechanism as defined in claim 6,wherein said opening locating structure is mounted, for movement between said extended viewing position and said retracted actuating position, on a rigid structure forming an adjustable part of said actuating structure, said rigid structure including an annular portion receiving a free end of said nosepiece, said opening locating structure including a tapered element extending in viewing relation from said annular portion when in said extended viewing position. 8. The opening locating mechanism as defined in claim 7,wherein said annular portion has a fastener guiding member mounted therein for spring biased movement in a direction to engage a fastener being driven and guide it into engagement with said tapered element. 9. A fastener driving device comprising:a frame structure presenting a handle portion constructed and arranged to be gripped by a user enabling the user to handle the device in portable fashion;a nosepiece structure operatively fixed with respect to said frame structure defining a fastener drive track;a fastener driving element movable through drive track;a power operated fastener driving system carried by said frame structure constructed and arranged to move said fastener driving element through successive operating cycles each including a drive stroke and a return stroke;a magazine assembly carried by said frame structure having fixed structure defining a fastener feed track leading to said drive track and movable structure constructed and arranged to enable a package of fasteners to be loaded in said magazine assembly and fed along said feed track so that the leading fastener of the fastener package is moved into said drive track to be driven outwardly thereof into a workpiece during the drive stroke of the fastener driving element;an actuating mechanism constructed and arranged to actuate said power operated driving system including a manually actuatable trigger assembly and a contact trip assembly; said contact trip assembly comprising a trigger enabling portion and a movable assembly coupled to said trigger enabling portion, said contact trip assembly being constructed and arranged to be movable between an extended position and a retracted position whereby said trigger enabling portion enables said trigger mechanism to activate said fastener driving element when actuated by a user when said contact trip assembly is in said retracted position and disables said trigger mechanism when said contact trip assembly is not in said retracted position; said contact trip assembly being constructed and arranged to be biased toward said extended position and to be moved toward said retracted position when said movable assembly engages a workp iece by pressing said frame structure toward said workpiece, thereby moving said contact trip assembly with respect to said nosepiece;a positioning mechanism constructed and arranged to position the nosepiece structure into an opening in a first workpiece such that a fastener is driven through the opening to fasten said first workpiece to a second workpiece,wherein said positioning mechanism comprises:an opening locating structure movably connected to the movable assembly of the contact trip assembly and adapted to extend into the opening so as to align the nosepiece with respect to the opening, said opening locating structure and said movable assembly of the contact trip assembly being movable relative to one another between an extended position and a retracted position and said opening locating structure being biased toward the extended position to facilitate locating of the opening, and movable to the retracted position when the opening locating structure is pressed against the first workpiece. 10. The fastener driving device as recited in claim 9, further comprising:a guiding structure movably connected to the nosepiece structure, the guiding structure being biased by a biasing spring to extend forwardly to guide the fastener in the driving track. 11. The fastener driving device as recited in claim 10,wherein the guiding structure is biased by the biasing spring such that when a fastener is introduced into the drive track said guiding structure forces a pointed end of said fastener to be proximate to the opening locating structure. 12. The fastener driving device as recited in claim 10,wherein the guiding structure is biased by the biasing spring such that when a fastener is introduced into the drive track said guiding structure forces a pointed end of said fastener to be proximate to the opening locating structure. 13. The fastener driving device as recited in claim 10,wherein the guiding structure is constructed and arranged to pivot around a pivot axis disposed at an extremity of said guiding structure. 14. The fastener driving device as recited in claim 10,wherein the guiding structure is constructed and arranged to slide perpendicularly to a driving axis defining by the driving track in the nosepiece. 15. The fastener driving device as recited in claim 10,wherein the guiding structure has an oblong shape. 16. The fastener driving device as recited in claim 10,wherein the guiding structure has a sector shape. 17. The fastener driving device as recited in claim 9,wherein said opening locating structure is biased toward the extended position using a resilient member. 18. The fastener driving device as recited in claim 17,wherein the biasing spring is disposed between two portions of said opening locating structure. 19. The fastener driving device as recited in claim 17,wherein said resilient member is a biasing spring. 20. The fastener driving device as recited in claim 9,wherein said opening locating structure has a tapered end adapted to extend into the opening. 21. The fastener driving device as recited in claim 20,wherein said tapered end includes a half-cone shape. 22. The fastener driving device as recited in claim 20,wherein said tapered end when introduced in the opening said tapered end occupies half of the opening. 23. The fastener driving device as recited in claim 20,wherein said tapered end acts as a guide arranged to guide the fastener into the opening. 24. The fastener driving device as recited in claim 9,wherein the opening locating structure comprises two flat members arranged to secure the opening locating structure to the nosepiece. 25. The fastener driving device as recited in claim 24,wherein the opening locating structure is prevented from rotation by portions of the nosepiece. 26. An opening locating mechanism for use with a fastener driving device, comprising:a rigid body adapted to be attached to said driving device, said body having a nose receiving portion adapted to receive a nosepiece of the device;an opening locating element mounted on said rigid structure, said opening locating element being movable in axial direction generally parallel to a direction in which a fastener is to be driven; anda spring biased fastener guide that contacts the fastener being driven and directs the fastener transversely to said axial direction and towards said opening locating element. 27. An opening locating mechanism as recited in claim 26,wherein said opening locating element has a tapered configuration. 28. An opening locating mechanism as recited in claim 26,wherein said fastener guide has a pivotable member that contacts the fastener. 29. An opening locating mechanism as recited in claim 26,wherein said opening locating member is spring biased downwardly in a direction towards which the fastener is driven.