Electrical, rotary-percussion hand-held tool
AssigneeHilti Aktiengesellschaft
InventorsMartin Mayr, Wolfgang Zwerenz, Walter Wissmach, Christoph Kink
Life of this patent
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Abstract
An electrical, rotary-percussion hand-held includes a spindle (4), an electric motor for driving the spindle at different rotational speeds corresponding to different operational modes, a percussion mechanism and a gear mechanism arranged between the electric motor (1) and the spindle (4) for transmitting a drive torque from the electric motor (1) to the spindle (4), and a rotation shifting device (7) operatively connected with signal elements (6, 6′) and electrically connected with the electric motor (1) for driving the spindle (4) with a rotational speed corresponding to a selected operational mode.
Claims4
An electrical, rotary-percussion hand-held tool, comprising a spindle (4) having a chuck (5) for receiving a working tool;
- an electric motor (1) for driving the spindle (4) at different rotational speeds corresponding to different operational modes;
- a percussion mechanism (2) and a gear mechanism (3) arranged between the electric motor (1) and the spindle (4) for transmitting a drive torque from the electric motor (1) to the spindle (4);
- a mode selection switch (8) for selecting an operational mode and having a plurality of stable, self-locked switching positions corresponding to the different operational modes;
- signal means (6, 61) operatively connected with the mode selection switch (8) in a switch position (A) thereof corresponding to an activated chisel positioning mode in which the mode selection switch (8) is in an unstable position;
- and rotation shifting means (7) operatively connected with signal means (6, 61) and electrically connected with the electric motor (1) for changing a rotational speed of the electric motor for driving the spindle (4) with a rotational speed corresponding to the selected operational mode.
Dependencies are inferred from the claim text.