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In a powered tool for dimpling a drywall panel and driving a drywall nail through such panel, into a substrate, a dimpler mounted to a nosepiece of the tool so as to be axially movable over a limited range has an annular portion disposed axially beyond the nosepiece. The tool includes a piston and a

In a powered tool for dimpling a drywall panel and driving a drywall nail through such panel, into a substrate, a dimpler mounted to a nosepiece of the tool so as to be axially movable over a limited range has an annular portion disposed axially beyond the nosepiece. The tool includes a piston and a driving blade joined to the piston and arranged for driving a drywall nail through the nosepiece and the annular portion, for engaging the annular portion near a distal end of the driving blade, and for driving the dimpler outwardly when the piston is impelled from a retracted position toward an advanced position. The annular portion has a frusto-conical bore. The driving blade has a frusto-conical tip fitting thereinto. A workpiece-contacting shoe is adjustable between a right-angled position relative to the drywall panel and an acute-angled position.

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1. A powered tool for dimpling a workpiece, and for driving an elongate fastener, through the workpiece into a substrate, the tool comprising (a) a housing structure defining a chamber having an axis and a nosepiece extending axially from the housing structure, the nosepiece having a bore coaxial

1. A powered tool for dimpling a workpiece, and for driving an elongate fastener, through the workpiece into a substrate, the tool comprising (a) a housing structure defining a chamber having an axis and a nosepiece extending axially from the housing structure, the nosepiece having a bore coaxial with the chamber, the bore communicating with the chamber, (b) a dimpler mounted to the nosepiece so as to be outwardly and inwardly movable along the axis, over a limited range of relative movement between the dimpler and the nosepiece, the dimpler having an annular portion disposed axially beyond the nosepiece, the dimpler having a bore coaxial with the nosepiece bore, and (c) means including a piston movable axially within the chamber between a retracted position and an advanced position and a driving blade extending axially through the housing structure, the driving blade having a proximal end and a distal end and being joined to the piston at the proximal end so as to be conjointly movable with the piston between the retracted and advanced positions, for driving an elongate fastener through the bore of the nosepiece and through the bore of the annular portion of the dimpler, by engaging the annular portion of the dimpler with the distal end of the driving blade, and for driving the dimpler outwardly when the piston and the driving blade are moved from the retracted position toward the advanced position. 2. The tool of claim 1 wherein the dimpler is biased outwardly along the axis. 3. The tool of claim 1 wherein the driving blade is positionable to engage the annular portion of the dimpler after the distal end has moved through the bore of the nosepiece. 4. The tool of claim 1 further comprising means including a resilient bumper for limiting axial movement of the dimpler outwardly along the axis. 5. The tool of claim 1 further comprising means including a workpiece-contacting shoe movable axially between a tool-disabling position and a tool-enabling position and biased toward the tool-disabling position for disabling the tool unless the workpiece-contacting shoe is moved to the tool-enabling position. 6. The tool of claim 5 further comprising means including a resilient bumper mounted to the workpiece-contacting shoe for limiting axial movement of the dimpler outwardly along the axis. 7. The tool of claim 5 wherein the workpiece-contacting shoe has a first workpiece-contacting surface defining a plane oriented at a right angle relative to the axis and a second workpiece-contacting surface defining a plane oriented at a first acute angle relative to the axis and at a second acute angle relative to the plane defined by the first workpiece-contacting surface, the first acute angle being larger than the second acute angle, a tip being mounted adjustably to the shoe, the tip being adjustable between a first position and a second position, the tip having a workpiece-contacting surface coplanar with the first workpiece-contacting surface in the first position of the tip. 8. The tool of claim 7 wherein the tip also has a workpiece-contacting surface coplanar with the second workpiece-contacting surface in the second position of the tip. 9. The tool of claim 7 wherein the shoe has an extending portion and the tip is mounted to the extending portion so as to be rotatably adjustable between the first and second positions. 10. The tool of claim 1 wherein the annular portion of the dimpler has a socket having a frusto-conical wall and the driving blade at the distal end has a frusto-conical tip conforming generally to the frusto-conical wall, the driving blade tip fitting into the socket to drive the dimpler outwardly when the piston and the driving blade are moved from the retracted position toward the advanced position.