Abstract: A manual tool for removing material from brittle and/or non-ductile stock includes a housing (1) with a drive unit (2) for a tool bit (3) located within the housing (1). The tool bit is arranged to be rotated by the drive unit (3) about the bit axis. In addition, an electro-acoustic converter (4) for producing ultrasonic vibrations and a vibration amplifier (5) are positioned within the housing for superimposing ultrasonic vibrations on the rotational action of the tool bit during operation on the manual tool.

Abstract: A pipe clamp is formed of a pair of semicircular clamp halves, one having a first end region (1) and the other a second end region (2). First end region (1) has a radially outwardly extending projection (3) and two guides (6, 7) located along opposite sides. Second end region (2) has a circumferentially extending radially flexural locking strip (4) with a stop face (5) directed away from a free end of the second end region (2). In the closed position, the guides (6,7) of the first end region overlap at least a part of the second end region, so that the second end region is prevented from moving radially outwardly. In moving the first and second end regions into the closed position, the projection presses the locking strip radially outwardly until the projection (3) cooperates with the stop face (5) of the locking strip (4) in the closed position.

Abstract: A pipe clamp includes a wall part (1) with at least one bracket (3) located on its outside surface. At least one attachment part (2) is engageable in the bracket (3) and projects laterally outwardly from the wall part.