Abstract: A tool, such as a pneumatic tool, includes a casing, tool-holder spindle extending along an axis, and a drive mechanism for the tool-holder spindle. The mechanism uses a first member for driving the spindle in rotation about its axis and a second member for driving the spindle in translation along its axis. The second drive member is screwed onto a threaded portion of the spindle so that the spindle advances or returns as a function of the relative rate of rotation of the drive members. The second drive member is displaced along the axis between an advanced position and a returned position.

Abstract: A tool, such as a pneumatic tool, includes a casing, tool-holder spindle extending along an axis, and a drive mechanism for the tool-holder spindle. The mechanism uses a first member for driving the spindle in rotation about its axis and a second member for driving the spindle in translation along its axis. The second drive member is screwed onto a threaded portion of the spindle so that the spindle advances or returns as a function of the relative rate of rotation of the drive members. The second drive member is displaced along the axis between an advanced position and a returned position.

Abstract: This tool comprises: a casing (3), a tool-holder spindle (5) extending along an axis (A), a drive mechanism (9) for the tool-holder spindle, the mechanism comprising: a first member (21) for driving the spindle (5) in rotation about its axis, a second member (35) for driving the spindle in translation along its axis, the second drive member being screwed onto a threaded portion of the spindle (5) so that the spindle (5) advances or returns along the axis (A) as a function of the relative rate of rotation of the drive members (21, 35). The tool comprises means (37) for displacing the second drive member (35) relative to the casing (3) along the axis (A) between an advanced position and a returned position. Application, for example, to pneumatic drilling tools.