Rotary impact tool

A rotary impact tool for use with a motor, comprising:

• a hammer configured to rotate by receiving a rotational force of the motor;
• an anvil configured to rotate by receiving a rotational force of the hammer, such that if a torque of a value not less than a predetermined value is applied to the anvil from the outside, then the hammer is disengaged from the anvil to rotate idle and applies an impact to the anvil in a rotational direction after rotating idle by a predetermined angle;
• an end tool attached to the anvil;
• a main switch adjusting the rotating speed of the motor according to a pulling amount of a trigger;
• and
• a speed switching device configured to switch the rotational speed of the motor between a high speed mode and a low speed mode, so that the motor rotates in the low speed mode during the time when the hammer applies impacts to the anvil,
• wherein both in the high speed mode and the low speed mode, the rotational speed of the motor is adjusted according to the pulling amount of the trigger by the main switch;
• and
• wherein the rotational speed in the high speed mode is higher than the rotational speed in the low speed mode when the trigger is pulled by the same amount.

A rotary impact tool for use with a motor, comprising:

• a hammer configured to rotate by receiving a rotational force of the motor;
• an anvil configured to rotate by receiving a rotational force of the hammer, such that if a torque of a value not less than a predetermined value is applied to the anvil from the outside, then the hammer is disengaged from the anvil to rotate idle and applies an impact to the anvil in a rotational direction after rotating idle by a predetermined angle;
• an end tool attached to the anvil;
• a control circuit adjusting the rotating speed of the motor according to a pulling amount of a trigger;
• and
• a speed switching device coupled to the control circuit and configured to switch the rotational speed of the motor between a high speed mode and a low speed mode, so that the motor rotates in the low speed mode during the time when the hammer applies impacts to the anvil,
• wherein both in the high speed mode and the low speed mode, the rotational speed of the motor is adjusted according to the pulling amount of the trigger;
• and
• wherein the rotational speed in the high speed mode is higher than the rotational speed in the low speed mode when the trigger is pulled by the same amount.