Portable power drill with drilling implement rotating and feeding means

A portable power drill comprising:

• a housing;
• a drive motor;
• a rotative drive spindle configured to carry a drilling implement and being axially displaceable relative to the housing for feeding movements;
• a coupling for transferring rotational movement from the drive motor to the drive spindle irrespective of axial displacement of the drive spindle;
• and
• a feed mechanism for axially displacing the drive spindle;
• wherein the feed mechanism comprises:
• a threaded portion of the drive spindle;
• a nut piece rotative but axially immovable relative to the housing and arranged to cooperate with said threaded portion;
• and
• a feed shaft located in parallel with and coupled to the drive motor via a transmission and drivingly connected to said nut piece;
• wherein said transmission comprises:
• a belt drive provided with a toothed flexible belt;
• a first pulley arranged on the drive motor;
• and
• a second pulley arranged on the feed shaft;
• and
• wherein said first and second pulleys are exchangeable to change a rotation speed of said feed shaft in relation to a speed of the drive motor.