A torque wrench assembly comprises a torque wrench and a reaction arm and locking means for locking together the torque wrench and the reaction arm. The locking means comprises a connection member located on the torque wrench; an opening on the reaction arm for receipt of the connection member of the torque wrench; a locking member slidably mounted in a channel on the reaction arm, the locking member including an aperture sized to allow the connection member to pass therethrough; and biasing means arranged to bias the locking member into a position wherein the aperture is partially aligned with the opening. The connection member has an insertion end for insertion into the opening of the reaction arm, and immediately adjacent the insertion end is a recess. The recess is shaped to receive a part of the locking member.

According to a first aspect of the invention we provide a self-retaining drive shaft assembly for use with a device for tightening and loosening of an industrial fastener having: a drive retainer drive shaft; a drive retainer cap; a drive retainer plunger; and a drive retainer segment assembly. The segment assembly is formed between the drive shaft and the cap. The cap is formed between the segment assembly and the plunger. The segment assembly, the cap and the plunger are formed substantially within the drive shaft. Advantageously the retainer assembly is of unitary construction; requires no loose parts or external implements to engage and secure the drive shaft to a drive head of the device; reduces likelihood of device failure during operation due to improper engagement of the drive shaft; and increases user safety during device operation.

A system and method is provided for monitoring a hydraulic power system having at least one light emitter and a button. The method includes powering on the hydraulic power system, receiving an actuation at the button and detecting a release of the button after a first time interval, and entering a diagnostic state. The method further includes retrieving a code and displaying the code by turning on the emitter in a first pattern. In some embodiments, a system and method is provided for regulating a temperature of a hydraulic power system. In some embodiments, a system and method is provided for controlling operation of a hydraulic torque wrench.

A control assembly, a tool and a method. The assembly may include a handle assembly including a first handle portion and a second handle portion, the handle assembly being removably connectable to a tool housing; and pump controls operable to control a pump to drive a tool drive mechanism and thereby an output member. Operation of the pump may require an operator's first hand on a first handle portion and the operator's second hand on a second handle portion. The pump may be operable under the control of the pump controls to drive the drive mechanism when the handle assembly is connected to the housing and when the handle assembly is disconnected from the housing.

A torque wrench assembly comprises a torque wrench and a reaction arm and locking means for locking together the torque wrench and the reaction arm. The locking means comprises a connection member located on the torque wrench; an opening on the reaction arm for receipt of the connection member of the torque wrench; a locking member slidably mounted in a channel on the reaction arm, the locking member including an aperture sized to allow the connection member to pass therethrough; and biasing means arranged to bias the locking member into a position wherein the aperture is partially aligned with the opening. The connection member has an insertion end for insertion into the opening of the reaction arm, and immediately adjacent the insertion end is a recess. The recess is shaped to receive a part of the locking member.

A power tool includes a housing defining a grip portion, a motor having a motor drive shaft, a drive assembly coupled to the motor drive shaft and driven by the motor, an output assembly coupled to the drive assembly and having an output member that receives torque from the drive assembly, causing the output member to rotate about an axis, and a transducer assembly disposed between the grip portion and the output assembly to measure the amount of torque applied through the output member, when the motor is deactivated, in response to the power tool being manually rotated about the axis.

A rotation angle indicating retainer assembly for use with and/or integrated with a hydraulically driven device for tightening and loosening a threaded fastener is disclosed and includes: a retainer cap assembly having a hollow cylindrical shape with an upper hollow portion, a lower hollow portion, a hollow disc, a ring having polygonal connection formations and a ball bearing assembly; a plunger assembly having a cylindrical shape with a connection portion, a depression portion, a compression spring and a lower retaining ring; a rotation angle scale assembly having a hollow cylindrical shape with an upper hollow disc with an arrow indicator and a lower portion having polygonal formations; a rotation angle indicator assembly having a substantially hollow cylindrical shape with an upper rotation angle dial, a lower portion having a rotation angle scale, an upper retaining ring, a wave spring and friction ring; and wherein the rotation angle scale assembly is nonrotatably attachable to a driving portion of a housing of the device, and wherein the retainer cap assembly is nonrotatably attachable to a square drive shaft torque output assembly of the device. Advantageously the rotation angle indicating retainer assembly: is not connected with a device power source; is not used in a feedback loop between the device, the device power source and/or the fastener; is able to be zeroed once an operator wishes to observe an angle of rotation of the fastener; is of unitary construction; requires no loose parts or external implements to engage and secure a drive shaft to the drive head of the tool; reduces likelihood of tool failure during operation due to improper engagement of the drive shaft; and increases user safety during tool operation.

Disclosed herein is an improved hydraulic torque wrench pump (HTWP) which utilizes a combined filtration system and cooling system for filtering and cooling substantially all the oil returned to the pump including from a hydraulic torque wrench. The hydraulic torque wrench pump includes an electric motor and one or more pumping elements arranged in a protective frame. The electric motor used in association with the hydraulic pump has a high-efficiency design that includes a high power to height ratio and yields efficiency in a range of 90% to 95%. A sealed oil tank is used for storing the oil. The sealed oil tank helps in restricting one or more impurities from entering and contaminating the oil.

A uniquely designed torque wrench having a torque body, the torque body attached to a frictional squeezing clamp, and a lug socket which is rotationally connected to the frictional squeezing clamp. The frictional squeezing clamp entering a contracted stated during extension of a rod of a hydraulic cylinder, and entering an expanded state during the retraction of the rod of a hydraulic cylinder, the lug socket turning the wing nut of a hammer union.

A torque wrench for multiple bolts or nuts comprises multiple drive spindles that are arranged annularly around a center and are equipped or able to be equipped at the end with respective torque-applying tools, and a ratchet drive, associated with each drive spindle and driven by means of a hydraulic piston drive, for driving the drive spindles. In addition to the ratchet drive, a locking ratchet for locking the drive spindle acts on each drive spindle to keep it from turning back when exercising a return stroke movement of the drive ratchet. The locking ratchets are arranged in a locking bracket, which is penetrated by the drive spindles. The locking bracket has means for loosening the locking ratchets.