Hilti Aktiengesellschaft

Otto Noser

Stefan Miescher

Heinz Kousek

Hanspeter Schad

Alexander Hoop

Edwin Schweizer

Hansjorg Nipp

Otmar Ganahl

Ulrich Bourgund

Hans Leemann

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.

Percussion blow added manually operable drilling tool

An apparatus for locating magnetizable material (5, 6) within a structure (4) includes a scanning head (1) with a permanent magnet (28) for producing a magnetic field in the structure (4). Two field plates (30, 31), adjacent one another on only one pole face of the permanent magnet (28), are interconnected by a differential circuit and measure the magnetic field of the magnet disturbed by the magnetizable material (5, 6). The differential values measured by the pair of field plates form a differential measured signal for establishing, after differentiation, the location of the magnetizable material (5, 6) within the structure (4). The location of the magnetizable material (5, 6) within the structure can be shown on a monitor (7) of an evaluation unit (3).

Apparatus for determining location of an element of magnetizable

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Vaduz, Liechtenstein

Otto Noser