Hammer drill adapter

An adapter device for securement to an output rotary drive of a drill, said adapter comprising

• a housing having an input shaft supported for axial rotation in said housing and having a connectable end for securement to said rotary drive,
• an output connector, said input shaft and said output connector being disposed on a common axis,
• a fixed mode cam immovably secured with respect to said housing and comprising a sloped cam surface and a first toothed circumferential ring,
• an annular floating cam in sliding non-rotational engagement with and about said input shaft, said floating cam comprising a toothed ring engageable with said first toothed ring of said fixed mode cam,
• an annular keying element disposed about said floating cam and in engagement with said output connector, said keying element being displaceable in and out of engagement with said floating cam and also displaceable so as to be substantially radially adjacent to said first toothed ring of said fixed mode cam, and
• selective adjustment means for cooperating with said sloped cam surface to displace said keying element in and out of engagement with said fixed mode cam and said floating cam, wherein said input shaft can impart a rotary drive, rotary drive and impact forces or impact forces only to said output connector and wherein said first toothed ring of said fixed mode cam and said toothed ring of said floating cam together comprise means for creating said impact forces during said engagement thereof.