B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
77/41, 121/7
B23B 47/00 (2006.01) B23B 49/00 (2006.01) B25B 21/00 (2006.01) B25D 17/00 (2006.01) B25D 17/02 (2006.01) B25F 3/00 (2006.01)
Patent
CA 1062051
Abstract of the Disclosure A power tool includes manually operated selector means for alternately establishing rotary-hammer and hammer- only modes of operation for the associated drill bit. The attachment is in the form of an elongated member having a longitudinally extending blind bore for receiving the drill bit; retaining means are provided for releasably mounting the attachment on the drill bit. An annular should defining the mouth of the blind bore is in abutting engagement with another annular shoulder, the latter being arranged to re- ceive impact blows from the hammer mechanism of the power tool. In one embodiment, this second mentioned annular shoulder is constituted by a tappet forming part of the hammer mechanism. In another embodiment, this second men- tioned annular shoulder is an integral part of the drill bit. Impact blows are transmitted to the attachment only through the area of engagement of the aforesaid annular shoulders. In one embodiment, the attachment has its work- ing end in the form of a blunt end cylinder adapted to in- stall concrete anchors. In another embodiment, the working end of the attachment is in the form of a chisel.
267693
Dillon William E.
Gawron Alex F.
LandOfFree
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