Tool driving or impacting – Automatic control of power operated means – Drive means responsive to torque or speed condition
Patent
1996-09-20
2000-04-04
Vo, Peter
Tool driving or impacting
Automatic control of power operated means
Drive means responsive to torque or speed condition
173 2, 173180, 173182, B25B 2314
Patent
active
060449187
ABSTRACT:
A percussion blow added manually operable drilling tool, such as a hammerdrill, has a housing (2) containing an electric motor for rotating a tool bit chuck (9) about its axis, a control device (C) for controlling the rpm of the chuck (9) operated by the electric motor (3) which is activated by a switch (5) located on the exterior of the housing (2), and a percussion blow mechanism for periodically applying axially directed blows to a bit (10) secured in the chuck (9). The electric motor (3) is coupled to a device (12) for measuring the reaction torque. The control device (C) is connected to an evaluation unit (E) which is connected to the device (12) for measuring the reaction torque so that the rpm of the chuck can be regulated from maintaining the measured reaction torque at a maximum.
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Bourgund Ulrich
Hoop Alexander
Miescher Stefan
Noser Otto
Schad Hanspeter
Calve James P.
Hilti Aktiengesellschaft
Vo Peter
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