Accessory for a fastening gun

An accessory for a fastening gun for discharging staples and wherein each staple comprises a crown and a leg on each side of the crown, the accessory comprising:

• a magazine assembly with a feed end and a discharge end and configured to support a series of staples in a pre-discharge orientation and with a feed mechanism for feeding the staples from the feed end to the discharge end;
• a staple drive member, the staple drive member defining first and second opposed generally flat surfaces wherein said first generally flat surface is directed toward said magazine assembly, said staple drive member further having a head with a crown-engaging surface, the head including beveled edges opposite the crown-engaging surface and wherein said beveled edges connect said first and second opposed generally flat surfaces in a direction that is aligned with the legs of each staple in said magazine assembly and wherein an acute angle is formed between said beveled edges and said second opposed generally flat surface, and a shank extending from the head so that the staple driver member has a generally T-shaped appearance, said shank having a longitudinal axis in the direction of movement of said staple drive member and wherein said head is perpendicular to said longitudinal axis;
• and
• a drive member guide assembly including a guide plate, the guide plate fastened to an elongate outer guide member of the magazine assembly and a cover plate that is fastened to the guide plate, an inner surface of the cover plate and the guide plate defining an internal passage in which the head of the drive member can be displaced towards and away from a workpiece and the cover plate and guide plate being configured so that the internal passage also defines a guide path for the staples, once they are fed from a staple guide assembly;
• wherein the drive member guide assembly is mounted on the magazine assembly and configured so that a staple drive member is mounted in the drive member guide assembly to be driven and retracted along a predetermined path with respect to the magazine assembly, so that, when driven, the staple drive member can engage a staple to drive legs of the staple into respective components, the drive member guide assembly being configured for mounting on the fastening gun with the staple drive member connected to a piston of the fastening gun.