Patent ID: 7735575

Claim:
A hammer-drill comprising: a drill housing supporting an output spindle, the drill housing comprising a first material having a first hardness; a rotating hammer member mounted on the output spindle to rotate with the output spindle, the rotating hammer member comprising ratchet teeth; a non-rotating hammer member mounted around the output spindle and radially adjacent the first material of the drill housing, the non-rotating hammer member comprising cooperating ratchet teeth and a plurality of support surfaces; a plurality of support members, each of the support members providing a cooperating support surface against which one of the plurality of support surfaces contacts to inhibit rotation of the non-rotating hammer member relative to the housing during a hammer mode operation, the support members comprising a second material having a second hardness which is harder than the first material; a plurality of first support recesses in the drill housing, each of the first support recesses receiving a first end of the support members; and a plurality of second support recesses in the drill housing, each of the second support recesses receiving a second end of the support members.