Abstract: Illustrative embodiments of impact tools with speed controllers and methods of controlling such impact tools are disclosed. In at least one illustrative embodiment, an impact tool may comprise a ball-and-cam impact mechanism including a hammer and an anvil. The hammer may be configured to rotate about a first axis and to translate along the first axis to impact the anvil to cause rotation of the anvil about the first axis. The impact tool may further comprise a motor and a speed controller. The motor may include a rotor configured to rotate when a flow of compressed fluid is supplied to the rotor to drive rotation of the hammer of the ball-and-cam impact mechanism. The speed controller may be coupled to the rotor and may be configured to throttle the flow of compressed fluid supplied to the rotor based on a rotational speed of the rotor.

Abstract: A rotary compressor includes a rotor rotatably disposed to be eccentric to an inner peripheral surface of a housing, a rotation shaft for transmitting rotation force of an engine to the rotor, and a connection member through which the rotation shaft is connected to the rotor so that the rotation force is transmitted from the rotation shaft to the rotor. When a rotation speed of the rotation shaft is lower than a predetermined valve, the connection member is connected to the rotation shafts at the rotation force of the rotation shaft that is transmitted to the rotor. On the other hand, when the rotation speed of the rotation shaft is equal to or higher than the predetermined value, the rotation force from the rotation shaft to the rotor is interrupted, so that the rotary compressor is stopped. Therefore, useless load applied to the engine can be restricted.