A pneumatic torque impulse delivering power tool with an automatic power shut-off mechanism including: a pneumatic motor, a drive member rotatable by the pneumatic motor, an air supply channel, with a shut-off valve, for providing pressurized air, and a valve control device that can shut the shut-off valve and stop the air flow when the drive member is exposed to a retardation magnitude above a certain threshold level. The valve control device includes: an inertia responsive member rotatable with the drive member between initial and shut-off positions in which the shut-off valve cannot and can close, respectively, and an air damped movement restrictor which can counteract a movement of the inertia responsive member towards its shut-off position such that the shut-off valve is shut when the drive member is exposed to a retardation magnitude above a certain threshold level corresponding to a dampening force of the air damped movement restrictor.

An impact device for power transmission includes an impact unit and a hydraulic pressure adjusting unit. The impact unit has a hydraulic cylinder which is installed with a piston assembly and an output shaft therein for outputting torque through the output shaft by utilizing a hydraulic pressure provided in the hydraulic cylinder. The hydraulic pressure adjusting unit is disposed in the hydraulic cylinder and operative to adjust the hydraulic pressure of the hydraulic cylinder. Therefore, the impact device for power transmission can generate a hydraulic torque pulse, and the magnitude of the output torque can be adjusted by the hydraulic pressure adjusting unit.

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.

A handle for a hydraulically driven tool is provided reduces the amount of heat transmitted to the user of the tool as a result of the high temperature fluid flowing through the inner body of the handle. The inner body is formed of a heat transmissive material which has at least one channel through which the fluid flows. The handle has a number of properties which reduces heat transmission to the user, including standoffs, ribs and fastener receiving extensions.

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.

A hydraulic torque wrench and a method of determining a load exerted on a workpiece by a hydraulic torque wrench. The wrench may generally include a housing; a drive element for engaging the workpiece; a drive actuator for transmitting a torque to the drive element; and a gauge coupled to at least one of the housing and the drive actuator, the gauge being configured to detect a characteristic indicative of a torque exerted by the drive element to the workpiece. The wrench may include a sensor configured to detect rotation of the drive element.

A rotary power tool, such as an oil pulse driver, includes: a motor, a pinion rotated by the motor, planet gears that mesh with the pinion, an internal gear that meshes with the planet gears and a shaft that is rotationally driven by the planet gears and disposed frontward of the planet gears. The internal gear comprises an internal gear part and an internal gear retaining part for holding the internal gear part. An oil unit bearing is disposed frontward of the internal gear part, and the oil unit bearing is held at a front part of the internal gear retaining part.

A pneumatic motor with built-in striker mechanism mainly includes a cylinder, rotor set and output shaft lever. The rotor set has a rotary drum and flexible blades. The output shaft lever can be driven by the rotary drum. A chamber is formed into the rotary drum and a striking portion on the output shaft lever is located within the chamber. The built-in striker mechanism is placed in the chamber and has striking bulges protruded on the striking portion, movable hammers sleeved externally on the striking bulge and struts axially located on the rotary drum. This new pneumatic motor has the striker mechanism set into the rotary drum of the rotor set, thus reducing greatly the axial length and volume of the pneumatic motor and realizing ease-of-use.

A hydraulic torque wrench and a method of determining a load exerted on a workpiece by a hydraulic torque wrench. The wrench may generally include a housing; a drive element for engaging the workpiece; a drive actuator for transmitting a torque to the drive element; and a gauge coupled to at least one of the housing and the drive actuator, the gauge being configured to detect a characteristic indicative of a torque exerted by the drive element to the workpiece. The wrench may include a sensor configured to detect rotation of the drive element.

A system including an annular socket body for tightening a lock ring around a threaded end of a conduit connector extending through an opening in a wall of a junction box is provided. To facilitate capturing of the lock ring by the socket body without interference, the wrench lugs of the socket body each have a circumferential extent that is less than 50% of a circumferential extent between teeth of the lock ring, and there are half as many wrench lugs than teeth. Flat side faces of the wrench lugs are disposed at an angle of between about 15 and 40 relative to sides of the teeth of the lock rings so that the wrench lugs engage the lock ring teeth in a sliding point contact that promotes uniform engagement between the wrench lugs and the lock ring teeth when torque of about 1400 inch-pounds is applied to the socket body.