Spindle head for tool turret

A spindle head for a tool turret, comprising:

• a housing having a first securing element;
• a spindle rotatably mounted in said housing;
• a bushing coupled to said spindle to be longitudinally slidable, but nonrotatable, relative to said spindle, said bushing having a second securing element engaging said first securing element in a work setting of said bushing, axial movement of said bushing relative to said housing being limited in one axial direction by engagement of said first and second securing elements;
• a prebiased spring biasing said bushing in said one axial direction, but allowing axial movement of said bushing in an opposite axial direction against a biasing force of said spring to disengage said first and second securing elements;
• and
• cooperating surfaces on said first and second securing elements precluding self-locking of said first and second securing elements in the work setting, at least one of said surfaces of said first or second securing elements being inclined relative to said axial directions.