B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
B23B 45/16 (2006.01) B25D 16/00 (2006.01)
Patent
CA 2537552
A hammer drill comprising: a motor 20; a tool holder 6 capable of holding a cutting tool 8; a drive transmission, capable of operating in at least two modes of operation 14, 16, 18, which, when a cutting tool 8 is held by the tool holder, is capable of converting the drive output of the motor 20 into a rotary drive for the cutting tool 8 and/or repetitive impacts which are imparted to the cutting tool 8 depending on the mode of operation of the drive transmission; a mode change mechanism which is capable of switching the drive transmission between the at least two modes of operation 14, 16, 18; a switch 22 which, when activated, provides power to the motor 20; and a mechanical lock on mechanism 26 which, when activated, mechanically locks the switch 22 in its activated state to maintain the power to the motor; characterised in that there is further provided: a first sensing apparatus 50 which indicates the mode of operation of drive transmission; a second sensing apparatus 36 which indicates whether the lock on mechanism 26 has been activated; and a controller 40 which is capable of interfering with the operation of the motor when power is provided to it by the switch and which monitors the signals from the first and second sensing apparatuses wherein, when the controller detects that the gear transmission is in at least one certain predetermined mode of operation and the lock on mechanism has been activated, it interferes with the operation of the motor 20.
Jaeger Rene
Jung Achim
Black & Decker Inc.
Sim & Mcburney
LandOfFree
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