Abstract: The invention is based on a device for sealing off a chamber (10) with lubricant (12) on a rotationally drivable component (14) from a second chamber (16), in particular at a peg of a power tool, having at least one seal (20) sliding at a contact face (18).

Abstract: A supplemental handle for a hand-held machining tool (18), has at least one grip element (10, 12, 14, 16) that is connectable with a housing (26) of the hand-held machine (18) by means of an insulating device (20, 22, 24) for insulating oscillations. The insulating device (20, 22, 24) includes at least one bearing unit (28, 30, 32, 34), and the grip element (10, 12, 14, 16) is guided in at least one direction by means of the bearing unit (28, 30, 32, 34). The bearing unit (28) has at least one bearing bolt (26), about which the grip element (10, 12) is pivotable. The insulating device may include at least one torsion spring.

Abstract: The machine tool, especially a hammer drill or chisel, has a rotatable and/or axially movable tool holder (10,12) for a tool (16) having a grooved shaft. The tool holder (10,12) includes a base body (22); two radially movable locking bodies (18,20) held in the base body and movable into respective locking positions engaged in two closed grooves (26,28) in the tool shaft; a bearing member (32) movable between a bearing position for holding the locking bodies (18,20) in the locking position and a releasing position in which the locking bodies are movable out of the grooves; an operating member (36,38) connected with the bearing member (32) for moving the bearing member (32) and a resilient plastic guiding member (42,44) arranged to guide the locking bodies (18,20) radially outward during motion from the locking to unlocking position and to act on the locking bodies (18,20) with a radially inwardly directed spring force.

Abstract: The machine tool, especially a hammer drill or chisel, has a rotatable and/or axially movable tool holder (10,12) for a tool (16) having a grooved shaft. The tool holder (10,12) includes a base body (22); two radially movable locking bodies (18,20) held in the base body and movable into respective locking positions engaged in two closed grooves (26,28) in the tool shaft; a bearing member (32) movable between a bearing position for holding the locking bodies (18,20) in the locking position and a releasing position in which the locking bodies are movable out of the grooves; an operating member (36,38) connected with the bearing member (32) for moving the bearing member (32) and a resilient plastic guiding member (42,44) arranged to guide the locking bodies (18,20) radially outward during motion from the locking to unlocking position and to act on the locking bodies (18,20) with a radially inwardly directed spring force.

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

Abstract: 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.

Abstract: 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.

Abstract: A hand power tool has a machine housing, a drive motor accommodated in the machine housing, a drive train connected with the drive motor and provided with a tool receptacle for rotation of a tool insertable in the tool receptacle, a detecting device for detecting an uncontrolled operation of the hand power tool by detecting a blocking of the tool in a workpiece with a resulting impact-like turning of the machine housing, a blocking device provided for the drive train and releasable by the detecting device, the locking device having a locking toothing arranged in the drive train and a blocking member movably supported in the machine housing and form-lockingly engagable in the locking toothing so as to non-rotatably fix the drive train relative to the machine housing, the detecting device being formed so that it produces an electrical release signal in an uncontrolled operation, the blocking device being releasable by the electrical release signal, and further has electromagnet device actuatable by the release

Abstract: A motor of a vibration generator has a rotary output shaft whose revolutions are variable and include a range of revolutions having a lower and an upper limit. A first element constitutes a first imbalanced mass and is fixedly mounted on the output shaft for rotation with the same. A second C-shaped element constitutes a second imbalanced mass and straddles the first element and the output shaft, being displaceable relative thereto under the influence of centrifugal force in direction substantially radially outwardly away from the shaft to a series of positions in each of which the generator produces usable vibrations of a different magnitude. Elastomeric bodies are interposed between and connect the first and second elements with one another, serving to yieldably restrain the second element against displacement to the positions of the aforementioned series while the revolutions of the output shaft are below the lower limit of the range of revolutions.