Patent ID: 6926595

Claim:
An oscillatory drive comprising a housing; a tool drive shaft arranged within said housing; a rotating drive shaft arranged within said housing at an angle to said tool drive shaft; an eccentric element located on said rotating drive shaft and having a spherical outer surface; a pivot element having a first end and a second end, said pivot element being fixed on said tool drive shaft at its first end and having a partially cylindrical inner surface at its second end, said partially cylindrical inner surface of said pivot element engaging said spherical outer surface of said eccentric element for oscillatingly driving said tool drive shaft pivoting back and forth about a longitudinal axis thereof; wherein said second end of said pivot element comprises a first outer side facing a first section of said housing and a second outer side opposite said first outer side and facing a second section of said housing; a first spring held between said first outer side of said pivot element and said first section for biasing said pivot element into a first direction; and a second spring held between said second outer side of said pivot element and said second section for biasing said pivot element into a second direction opposite said first direction.