An impact device includes a transmission shaft, an impact cylinder, two first impact pins and a first ring. The transmission shaft has an impacted section disposed in the impact cylinder, an extending section extending along an axis, a first protrusion extending toward a first radial direction, and two first concave surfaces located at the first protrusion. The impact cylinder has two elongated protrusions and two first radial holes separated by the elongated protrusions. The first impact pins are received in the first radial holes in parallel to the axis and abuttable against the first concave surfaces. The first ring is sleeved onto the impact cylinder and the first impact pins and has a first narrow groove in which one elongated protrusion is located, and a first wide groove in which the other elongated protrusion is movably located. The impact device has sufficient torque output and long lifetime.

An impact device includes a transmission shaft, an impact cylinder, two first impact pins and a first ring. The transmission shaft has an impacted section disposed in the impact cylinder, an extending section extending along an axis, a first protrusion extending toward a first radial direction, and two first concave surfaces located at the first protrusion. The impact cylinder has two elongated protrusions and two first radial holes separated by the elongated protrusions. The first impact pins are received in the first radial holes in parallel to the axis and abuttable against the first concave surfaces. The first ring is sleeved onto the impact cylinder and the first impact pins and has a first narrow groove in which one elongated protrusion is located, and a first wide groove in which the other elongated protrusion is movably located. The impact device has sufficient torque output and long lifetime.

An elongated, generally, cylindrical impact socket has a driven end and a drive end. The socket is elongated, the cylindrical shape is parsed in at least two, distinct uniform diameter generally coaxial sections having a mass in the range of at least about 2 to 3 times the mass of a standard or extended ASMEB107.110.20R socket.

According to an aspect of the present invention, there is provided an impact tool including: a motor; a hammer connected to an output portion of the motor; and an anvil to be struck by the hammer in a rotation direction and having a rotary shaft, the hammer striking the anvil in the rotation direction by driving the motor in pulses, wherein the anvil is provided in front of the hammer, wherein the hammer is driven in pulses by the motor, and wherein a rotation angle of the hammer is substantially proportional to a rotation angle of the motor.

An easy-to-convey heavy duty striking wrench includes a main body having a weight more than 20 kg and having a head and a body integrally connected to the head. The head engaged with a fastener can rotate about a working axis coincident with a rotating axis of the fastener. An axis passes through the center of gravity of the main body and is parallel to the working axis of the head. The main body further includes a first conveying device configured to be applied with a force through manual or mechanical operation to overcome the weight of the main body, permitting conveyance of the main body. The main body is rotatable about the axis to adjust an angular position of the main body relative to the fastener.

An easy-to-convey heavy duty striking wrench includes a main body having a weight more than 20 kg and having a head and a body integrally connected to the head. The head engaged with a fastener can rotate about a working axis coincident with a rotating axis of the fastener. An axis passes through the center of gravity of the main body and is parallel to the working axis of the head. The main body further includes a first conveying device configured to be applied with a force through manual or mechanical operation to overcome the weight of the main body, permitting conveyance of the main body. The main body is rotatable about the axis to adjust an angular position of the main body relative to the fastener.

A bit assembly includes a bit for driving a screw, a shank for holding and driving the bit to rotate about a pivot axis wherein the bit is capable of moving relative to the shank in a predetermined range, and a limiting structure formed between the bit and the shank for preventing the bit to move beyond the predetermined range. The bit and the shank are made of different materials and form a sliding connection so that they have a certain buffer space in the axial direction and in the circumferential direction thereby reducing the effect of impacts on the service life of the bit assembly.

An apparatus for rotating and tightening or loosening a threaded device utilized in connection with threaded members. The apparatus includes a reciprocating anvil which is impacted by a rotating hammer to reciprocate the anvil into a lug to rotate a threaded device.

An apparatus for rotating and tightening or loosening a threaded device utilized in connection with threaded members. The apparatus includes a reciprocating anvil which is impacted by a rotating hammer to reciprocate the anvil into a lug to rotate a threaded device.

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.