Patent ID: 8800090

Claim:
An apparatus for carrying out a working movement (B) moving to and fro having an elongated holding rod ( 11 ) defining a longitudinal direction and a work unit ( 13 ) which is coupled to the holding rod ( 11 ) and which is movable linearly only in said longitudinal direction relative to the holding rod ( 11 ) for carrying out the working movement (B) running parallel to the longitudinal direction, wherein an external drive ( 17 ) is provided for generating the working movement (B) wherein longitudinal movement of said work unit relative to said holding rod changes an overall length of the apparatus in said longitudinal direction, wherein the work unit ( 13 ) is coupled to a spindle ( 15 ) extending in the longitudinal direction and drivable to make a rotation such that a rotational movement of the spindle ( 15 ) can be converted into the working movement (B).