Patent ID: 6997269

Claim:
An attachment for a device having an external casing and an internally disposed coupler for moving a connectable extension in a generally forward manner, the attachment comprising: a housing defining a cavity with an inner wall and having an axis and axial end openings communicating with the cavity and further having an integrally disposed transverse reinforcing wall having a generally centrally disposed wall aperture thereby defining a proximal portion and a distal portion of the cavity; a coupling mechanism for coupling the proximal portion of the cavity to the device casing; an anvil disposed in the cavity forwardly of the reinforcing wall and having a transverse anvil shoulder with a generally centrally disposed shoulder aperture in substantial axial alignment with the wall aperture and having a shoulder aperture cross-sectional area; a pulling retainer integral with the anvil; a hammer bit having a first end and a second end separated by a collinear disposed thereon and being slideably disposed through the reinforcing wall and shoulder apertures in a generally axial manner, the first end terminating in an impacting head defining a head shoulder having a lateral area greater than the shoulder aperture cross-sectional area, the second end extending toward the proximal portion and adapted for connection to the coupler; and a biasing structure for resiliently urging the impacting head toward the anvil shoulder.