A DEVICE FOR SWITCHING THE REVOLUTIONS OF ELECTRICAL, TWO-SPEED, PERCUSSION AND REVERSIBLE HAND DRILLING MACHINE

摘要

The device is designed for switching the revolutions of electrical, two-speed, percussion and reversible drilling machines. A high switching reliability in idle as well as in motion time is achieved. The device is possessing a simplified construction with reduced overall dimensions. The device comprises a U-shaped strap (16) bearing-mounted on the axle (17), connected through its long arm (15) to the circular channel (10) of the frontal gear clutch (2), slot-sticked on the spindle (1) over which spindle are bearing-mounted the gears (4) and (5) spaced by the longitudinally slotted bush (9) and with the switching button (22) fitted to the body (8). The switching button is provided with a spring pin (23) mounted in the blind hole (24) disposed perpendicularly to the cylindrical surface (19) opposite to the cammed surface (20). By rotation of the switching button (22), both the cammed and the cylindrical surfaces and the spring pin (23) in the inside surface (18) of the U-shaped strap realize the displacement of the strap and respectively of the clutch towards the driven gears (4) and (5).