A dual action hydraulic piston assembly including a cylinder having first and second inlet ports on a first end and an outlet port on a second end, a conduit connected to the first inlet port and extending into the cylinder, an inner ram slidable along an outer surface of the conduit, and an outer ram slidable between the inner ram and the cylinder. The inner and outer rams are configured to move together toward the second end of the cylinder in response to a fluid being displaced via the first inlet port into the conduit, which displaces a second fluid through the outlet port at a first flow rate. The outer ram is configured to move toward the second end of the cylinder in response to a fluid being displaced via the second inlet port, which displaces the second fluid through the outlet port at a second flow rate.

The present disclosure provides hand-held, battery-powered tools for performing operations such as crimping and cutting, and having a remote monitoring and control systems. A frame of the tool supports a working head, a battery, a motor connected to the battery, a controller and a camera.

A method for producing a crimp connection via a handheld pulling and compression device and to a handheld pulling and compression device for carrying out the method. For the handheld pulling and compression device, which enables reliable production of crimp connections, a control unit is provided for controlling the electric motor for adjusting the crimping punch between the crimp position and the open position, and a sensor unit connected to the control unit for monitoring the motor performance data when the crimping punch is adjusted in the direction of the crimp position. The control unit interrupts the adjustment of the crimping punch in the intermediate position when predefined first motor performance data are exceeded and/or undershot, adjusts the crimping punch further in the direction of the crimp position after reactivation and terminates the crimping process when predefined second motor performance data are reached.

A hydraulic power tool with adjustable center of gravity, the hydraulic power tool includes a handle assembly having a frame, the handle assembly capable of being operatively coupled to one of a plurality of differently configured working head assemblies and a power unit housed by the frame. The power unit is longitudinally movable and positionable within the frame depending on which of the plurality of differently configured working head assemblies is operatively coupled to the handle assembly to maintain a substantially constant center of gravity of the hydraulic power tool regardless of which of the plurality of differently configured working head assemblies is operatively coupled to the handle assembly.

A hand-held battery powered hydraulic tool includes a tool frame having a motor, a working head operatively coupled to the tool frame and selectively actuatable by the motor and a rechargeable battery pack configured to power the motor, the battery pack is removably connected to the tool frame. The battery pack includes one or more cells. The cell includes first and second electrodes and an electrolyte. One or both of the first and second electrodes include a support layer and an electrochemically reactive species on the support layer and in contact with the electrolyte, and wherein the support layer includes a high specific surface area material.