Patent ID: 8182316

Claim:
A machine tool comprising: an oscillatory drive received within a gear case and being configured for driving a drive shaft oscillatingly about its longitudinal axis; a flange secured detachably at an outer end of said drive shaft; a thrust pin received axially displaceable within the drive shaft; a shoulder provided on said thrust pin; a counter flange secured detachably at a first outer end of said thrust pin; a spring caught between said shoulder of said thrust pin and said flange for biasing said thrust pin in a direction for pressing said counter flange against said flange; and a displacing mechanism for displacing said thrust pin between a working position and a released position, wherein in said working position said counter flange is biased by said spring against an oscillatory tool resting against said flange of said drive shaft for clamping said oscillatory tool between said flange and said counter flange under the action of said spring, and wherein in said released position said thrust pin is axially displaced for releasing said counter flange from the bias of said spring, thereby allowing said counter flange to be detached from said thrust pin and said oscillatory tool to be removed from said drive shaft; wherein said drive shaft comprises a hollow section projecting outwardly from said gear case, and wherein said spring is received in said hollow section of said drive shaft externally of said gear case; wherein said flange further comprises at least one form-locking element configured for positive coupling with a mounting opening provided on an oscillatory tool attached to said drive shaft and resting against said flange; and wherein said counter flange comprises at least one form-locking counter element mated to said form-locking element of said flange allowing positive coupling between said flange and said counter flange; wherein said displacing mechanism comprises an eccentric that directly engages a second outer end of said thrust pin opposite said first outer end of said thrust pin.