Robert Boschgmbh

Andreas Strasser

Heiko Roehm

Joachim Schadow

Reiner Krapf

Gerhard Meixner

Michael Mahler

Karl Frauhammer

Heinz Schnerring

Joerg Friedrich

Frank Mueller

Manfred Hellbach

Axel Kuhnle

Immanuel Werner

Markus Roth

Hardy Schmid

Willy Braun

Ralph Dammertz

Juergen Lennartz

Michael Mayer

Dietmar Hahn

Erhard Hoffmann

Matthias Tauber

Lars Schmid

Markus Leupert

Ulrich Single

Martin Rittner

Stefan Holst

Hubert Steinke

Christian Koepf

Harald Schindler

Hansjoerg Beutel

Werner Huser

Andreas Heilmann

Karl Treyz

Juergen Schlipf

Karsten Blair

Heinz Scherring

Peter Loehnert

Martin Streichfuss

A hand-held power tool includes an electric motor, a tool unit, and at least one operating unit. A motor switching unit is configured to sense a contact-pressure characteristic between the tool unit and the operating unit, and configured to switch the electric motor at least partially in dependence on the contact-pressure characteristic.

Hand-held power tool

The invention is based on a hammer drill and/or chisel hammer, having an impact mechanism unit, an impact mechanism housing and at least one damping unit. The invention proposes that the damping unit is arranged on the impact mechanism housing along a main extension direction of the impact mechanism unit.

Hammer drill and/or chisel hammer

A vibration dosimeter () for determining the vibrational loading of people includes a determination device () for determining the operating period duration, a calculation device () for calculating the permitted work time as a function of a tool-specific characteristic vibration value, a comparison device () for comparing the effective operating period duration with the permitted work time, and an interface () for reading in the characteristic vibration value from the tool ().

Vibration dosimeter for determining vibrational loading

The hand-held power tool has a vibration-damped main handle. The hand-held power tool has a device for fastening the main handle to a main element configured so that when the main element moves out of a stationary position toward the main handle the main element swivels around at least one swivel axis so that it is guided along a trajectory that extends with a slant of at least 10&#xb0; relative to a flat surface, which extends through a longitudinal tool axis and which has a surface normal oriented in a normal direction perpendicular to the longitudinal tool axis. As a result vibrations with a movement component perpendicular to the longitudinal tool axis are damped as well as vibrations that induce motion of the main element in the direction of the longitudinal tool axis toward the main handle.

Hand-held power tool with improved vibration-damped handle

The invention relates to a vibration dosimeter () and a method for determining the daily vibrational loading of persons who are exposed to mechanical oscillations at their place of work due to the operation of a work means and in particular of a manually operated electronic tool (). What is provided is that the dosimeter () comprises a determination device () for determining the effective daily operating duration of the work means (), a computer device () for calculating a daily work time until a specified trigger value or exposition limit value of the vibrational loading is reached from a work-means-typical vibration value and the trigger value or exposition limit value, and a comparison device () for comparing the determined effective daily operating duration of the work means with the calculated daily work time until the specified trigger value is reached.

Vibration dosimeter and method for determining the daily vibration exposure

The invention relates to a machine tool comprising an electric motor () which serves to drive a tool and which has an adjustable, electric brush arrangement (), and comprising a mode selector switch () having various switch positions. Provision is made for an adjusting device () to displace the brush arrangement () as a function of the switch position of the mode selector switch (). Furthermore, the invention relates to a corresponding method.

Machine tool and method for operating a machine tool

A handle for an electric hand tool, which in use, is detachably connected to the hand tool as an auxiliary handle (), includes at least one detection device (), which communicates with at least one regulating and/or control element in the electric hand tool through a contactless signal transmission device.

Handle with detecting unit

A chuck is described, in particular for a hammer drill or chisel hammer, having a chuck body having an insertion opening for holding a tool shank, and a locking element for axially locking the tool shank in the insertion opening, the locking element being movable between a locked position and an unlocked position, and having an arresting pin, mounted in the locking element and radially displaceable between an arresting position and a release position, which axially arrests the locking element in its arresting position and axially releases it in its release position.

Chuck

A hand-held power tool, in particular a rotary hammer, is indicated that includes a machine housing () with a tool fitting () integrated therein, the tool fitting () being rotatably drivable in a first mode and being non-rotatably fixable on the machine housing () in a second mode, and that includes a duty-type switch () with a coupling element () capable of being displaced to activate the modes, and an actuating element () that induces its displacement. To prevent maloperation and resultant damage to the machine when the operator switches between modes, the actuating element is designed as an electrical actuator (), preferably as an electromagnet () controlled by an electronic control unit () (FIG.).

In a multi-chamber device a chamber with lubricant is sealed off on a rotationally drivable component from a second chamber at a peg of a power tool, by at least one seal sliding at a contact face, and least one stationary component is provided in the chamber with lubricant before the contact face and surrounds a rotationally drivable component at least over a region of a circumference to substantially prevent turbulence in the lubricant in a region of the contact face.

Device for sealing a space

A snap ring for shafts or bores is proposed, which is able to be axially fixed in position by snapping into place in a circumferential groove. The snap ring is provided with a centering ring which, when the case of the snap ring is installed in the circumferential groove, extends with radial clearance to an annular clip of the snap ring, which is disposed approximately concentrically to the circumferential groove.

Circlip

A supplemental handle for a hand-held machining tool (), has at least one grip element () that is connectable with a housing () of the hand-held machine () by means of an insulating device () for insulating oscillations. The insulating device () includes at least one bearing unit (), and the grip element () is guided in at least one direction by means of the bearing unit (). The bearing unit () has at least one bearing bolt (), about which the grip element () is pivotable. The insulating device may include at least one torsion spring.

Supplemental handle

A hand power tool has at least one safety coupling arranged in a drive train, the safety coupling having at least two coupling elements for transmitting a torque around a rotary axis, at least one arresting element which is spring loaded and held in a guiding passage for connecting the coupling elements with one another, a guiding element, a spring providing spring-loading of the arresting element and supported in direction of the arresting element by the guiding element, the guiding element being non rotatably guided relative to an axis extending parallel to the rotary axis by guiding surfaces in the guiding passage, and the arresting element unlatching and keeping in contact with a surface toward which the arresting element is urged by the spring in response to exceeding of predetermined torque.

Hand held power tool

A hand held power tool formed as a hammer drill has a strikingly drivable tool holder having a base body, at least one locking body with which the base body is form-lockingly connectable and through which the base body is fixable in a rotary direction in at least two positions, the locking body being formed as a ring-shaped component.

A drilling and a percussion power tool and the tool holder, a housing, an air cushion percussion mechanism arranged in the housing and including a guiding tube, a piston reciprocating in the guiding tool, a striker reciprocating in the guiding tube, an air cushion chamber formed on the guiding tube between the striker and the piston, at least one control opening ventilating the air cushion chamber in an idling position of the percussion mechanism, a control part which in a percussion operation closes the at least one control opening for forming an air cushion in the air cushion chamber, and at least one additional opening formed in the guiding tube for ventilating of the air cushion chamber and arranged forwardly of the at least one control opening at a side of a tool so that in the percussion operation the at least one additional opening is covered by the striker.

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Rudersberg, Germany

Andreas Strasser