Removable sharpening attachment for a rotary hand tool

A sharpening attachment for a rotary hand tool having an output shaft with a tool bit holder and a housing with a nose portion including an opening in which the output shaft is located, and a generally cylindrically shaped sharpening bit mounted in the tool bit holder for engaging a work surface, said attachment comprising:

• a body portion having a rear end for mounting to the housing of the hand tool, said body portion having an internal opening aligned with the output shaft and sized to receive and permit rotation of the tool bit holder and sharpening bit, with at least a portion of the sharpening bit being exposed forwardly of said rear end for engagement with a tool member to be sharpened;
• a jaw portion attached to said body portion and extending forwardly along one side thereof and having a support surface for holding the tool member relative to the sharpening bit, said support surface lying in a plane that is at an acute angle relative to the axis of the sharpening bit, said plane intersecting the outer circumference of the sharpening bit;
• an extension attached to said body portion and extending forwardly thereof to a point that is coextensive with at least a major portion of the exposed portion of the sharpening bit to thereby define a protective guard, said extension being on the side opposite said jaw portion and extending beyond the end of the sharpening bit and having a transverse end portion that extends to the opposite side thereof, said end portion having a gap guide surface for contacting the tool member.

A sharpening attachment for a rotary hand tool having an output shaft with a tool bit holder and a housing with a nose portion including an opening in which the output shaft is located, and a sharpening bit mounted in the tool bit holder for engaging a work surface, said attachment comprising:

• a body portion having a rear end for mounting to the housing of the hand tool, said body portion having an internal opening aligned with the output shaft and sized to receive and permit rotation of the tool bit holder and sharpening bit, with at least a portion of the sharpening bit being exposed forwardly of said rear end for engagement with a tool member to be sharpened;
• a jaw portion attached to said body portion and extending forwardly along one side thereof and having a support surface for holding the tool member relative to the sharpening bit, said jaw portion being pivotally attached to said body portion so that the support surface is in a plane that is at an adjustable acute angle relative to the axis of the sharpening bit so that tool members can be sharpened to different angles by the sharpening bit;
• an extension attached to said body portion and extending forwardly thereof to a point that is coextensive with at least a major portion of the exposed portion of the sharpening bit to thereby define a protective guard, said extension extending beyond the end of the sharpening bit and having a transverse end portion that is adjustable in the radial direction toward the opposite side thereof, said end portion having a gap guide surface for contacting a tool member.

A sharpening attachment for a rotary hand tool having an output shaft with a tool bit holder and a housing with a nose portion including an opening in which the output shaft is located, and a generally cylindrically shaped sharpening bit mounted in the tool bit holder for engaging a work surface, said attachment comprising:

• a body portion having a rear end for mounting to the housing of the hand tool, said body portion having an internal opening aligned with the output shaft and sized to receive and permit rotation of the tool bit holder and sharpening bit, with at least a portion of the sharpening bit being exposed forwardly of said rear end for engagement with a tool member to be sharpened;
• a first jaw portion attached to said body portion and extending forwardly along one side thereof and having a first support surface for holding the tool member relative to the sharpening bit;
• a second jaw portion located generally on the side of said body portion opposite said first jaw portion, said second jaw portion extending forwardly along one side thereof and having a second support surface for holding the tool member relative to the sharpening bit;
• an extension attached to said body portion and extending forwardly thereof and located between said first jaw portion and said second jaw portion, said extension comprising side portions located on opposite sides of the sharpening bit, said extension extending beyond the end of the sharpening bit and having a bridging portion connecting said side portions together, each of the outer surfaces of said bridging portion lying in respective planes that are at an acute angle relative to the axis of the sharpening bit.