Hilti Aktiengesellschaft

Hanspeter Schad

Edwin Schweizer

Werner Kaibach

Walter Odoni

Alexander Hoop

Rene Dandliker

Hans-Werner Bongers-Ambrosius

Franz Popp

Albert Binder

Udo Hauptmann

Martin Richter

Stefan Miescher

Konrad Artmann

Chafic Abu Antoun

Reinhard Schulz

Till Cramer

Stefan Raber

Maximilian Stock

Erich Wisser

Christoph Hakenholt

Josef F&uuml;nfer

Bernhard Sander

Reinhard Lins

Christoph W&uuml;rsch

Jochen Kuntner

Peter Mugg

Hans Boeni

Marcel John

Thomas Doppelbauer

Ralf Ludwig

Joachim Vedder

Johann Dorfmeister

Cord-Henrik Surberg

Guenther Sanchen

Otto Noser

Reinhard Bertsch

Sherhey Khandozhko

Ulrich Bourgund

Josef Bauer

Charles Coffin

Günther Sanchen

A striking mechanism includes a working space whose first section is surrounded by a first electromagnet and whose second section is surrounded by a second electromagnet; a striking element that can move along a striking axis inside the working space and that has a magnetizable material; an anvil whose striking surface delimits the working space in the striking direction and which protrudes into the first magnetic coil and which is made of a magnetically soft material. A spring element is provided which exerts a force onto the striking element in every position in the working space in the direction of the anvil.

Striking mechanism and hand-held power tool

A concrete drill for a rotary and percussively driven hand tool machine with a cutting part () and a striking part () that is axially and limited displaceable relative to the cutting part (). Each of the cutting part () and the striking part () have a respective facial surface work area for machining a bore hole surface. The respective facial surface work area of the cutting part () and the striking part () radially overlap upon rotation of the concrete drill.

Concrete drill

An electrical hand-held power tool for at least partially percussive driving of a tool () along a striking axis (A) and including a striking mechanism () having a striker () for generating striking forces on the anterior arranged tool () and a housing () enclosing the striking mechanism () and having a handle () affixed thereto, with the striker () being formed as a high-energy piezo actor connected with a voltage pulse generating unit (), and rearwardly affixed to the housing ().

Percussive electrical hand-held power tool

A pneumatic percussive mechanism having an axially reciprocating percussive loaded percussion piston ( ), wherein a non-contacting magnetic field sensitive sensor ( ) is arranged radial thereto. The percussion piston ( ) features at least externally ferromagnetic material and has a plurality of axially separated zones ( ) of different magnetic permeability.

Pneumatic percussive mechanism

A percussion bores for forming borer in a stone material and including a chisel stem ( ) having a prismatic cross-section and provided with a chiseling head ( ) and at least one radial opening ( ), a twist drill ( ) extending through the cylindrical through-bore ( ) of the chisel stem and projecting beyond the chiseling head ( ), a drilling head ( ) with cutting elements ( ) provided at the projecting end of the twist drill and a shank ( ) provided at another end of the twist drill, and a stop ( ) provided between the shank ( ) and the chisel stem ( ), with a drill stem being offset radially inwardly with respect to an outer diameter of the shank in the region of the stop.

Percussion borer for forming bores in stone material

A working tool for use with a percussion power tool and including a cushioning elongate stem ( ), and a head ( ) connected with the stem ( ) for joint rotation therewith and for a limited axial displacement relative thereto, with the tool head ( ) being adapted, with respect to its resistance associated with its cushioning properties, to characteristics of the percussion piston ( ) of the power tool and with the tool stem ( ) and the tool head ( ) having mutually abutting each other end surfaces ( ) which form at least a partially flat contact upon abutting each other.

Working tool for a percussion power tool

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

A self-cutting, undercutting dowel (1) is formed of an axially extending anchor rod (2) with a head part (3) leading in a setting direction (S) of the dowel and an axially extending sleeve (5) laterally enclosing the anchor rod (2). At its end facing in the setting direction, the sleeve (5) has expansion sections (7) separated from one another by axially extending slots (6). The sleeve (5) can be driven over the head part (3) relative to the anchor rod (2) so that the expansion sections (7) flare radially outwardly. At least one of the expansion sections (7) has a tooth shape at its end facing in the setting direction forming a cutting edge (10) for cutting an undercut in a receiving material for the dowel. The cutting action is effected by rotating the sleeve (5). The cutting edge (10) is located at a side edge (11) of the expansion section (7) leading in the rotating direction (R) of the sleeve (5) and the cutting edge is inclined to an axis (A) of the sleeve at a first angle (.alpha.). The expansion section (7) with the cutting edge (10) has a trailing side edge (12) inclined relative to the axis (A) of the sleeve (5) at a second angle (.beta.). The sum of the two angles (.alpha.,.beta.) is less than 160.degree..

Self-cutting undercutting dowel

A manually operable tool, such as a hammer drill, for drilling and/or removing material in at least one of brittle material and low ductile material, has a continuously rotatable chuck (8) and a motor driven striking mechanism (1) for transmitting impulse-like blows to a tool bit (9) held in the chuck (8). The tool includes members (5) for transmitting impulse-like blows composed of superimposed axially-directed blows and torsional blows to the tool bit (9) in the chuck for forming drilling blows. Further, an adaptor can be provided for attachment to the hammer drill containing the members (5) for affording the superimposed blows.

Manually operable tool for drilling and/or removing material in brittle

The present invention discloses a method and an apparatus which enables one to obtain definite non-modulo-2.pi.-dependent measurements wherein a method for the fiber-optic measurement of force, which is based upon the strain-induced birefringence of a single-mode light waveguide, provides a compensation method for the phase differences of two linear modes of the exiting light waves, which are caused by the force acting on the light waveguide and the consequent change in birefringence. In one embodiment of the method, a liquid crystal cell, the birefringence effect of which can be controlled electrically, is used as a compensation element. The maximum of an autocorrelation function, which occurs as an image, and the respective voltage at the liquid crystal cell, are evaluated as a measurement for the birefringence which is to be compensated for and, accordingly, for the effective force. In an alternate embodiment of the method, the two partial waves are directed transversely relative to the propagation direction of the wave fronts by an optical component with linearly space-dependent birefringence. The autocorrelation function can then be obtained as a spatial coordinate and can be plotted electronically by a line detector such as a line array. The location of the maximum of the autocorrelation function is, under certain defined conditions, a measurement for the birefringence which is caused in the light waveguide by mechanical tension from which the magnitude of the force, which acts on the force sensor, can be calculated.

Method and apparatus for absolute measurement of force by use of

A method and the device for fiber-optic measurement of the absolute value of the pretensioning in a highly loaded mechanical structural component part are based on the measurement of the phase displacement of a light wave caused by the strain-induced birefringence in a single-mode light waveguide 4 which is embedded between two metallic disks or washers 3a, 3b. Since the measurement results are ambiguous modulo-2.pi., serial or simultaneous measurement with two light wavelengths .lambda..sub.1, .lambda..sub.2 is used according to a first method variant of the invention. The quantity of 2.pi. periods can be unequivocally determined within a predetermined measuring range by means of comparing the two measurement results. The evaluation is preferably effected according to a quadrature or phase step method, known per se. According to second method variant, the light waveguide 4 is irradiated with polarized white light. The phase difference of the two linear modes due to the influence of force on the structural component part is compensated for in a compensation device 20. The control signal required for the compensation of the path difference is evaluated as a measurement for the force. The compensation method has the advantage that no monochromatic light sources are required.

Method and device for the measurement of force by a fiber optics system

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Grabs, Switzerland

Hanspeter Schad