Abstract: The automatic oil return structure includes a piston assembly and a main body assembly. The piston assembly comprises an inner tube, an outer tube, and a displacement unit. The main body assembly comprises a first main section fluidly communicating with an oil storage container, a controlling assembly, an operating plug, and a switch channel fluidly communicating with the first main section, a pressurization channel, and an oil returning channel. When the pressure of the first main section achieves a maximum pressure, the pressure pushes the controlling assembly and the operating plug, and the oil storage container fluidly communicates with the first main section, lowering the pressure of the first main section. A switch assembly is moved to isolate the switch channel from the first main section, such that the switch channel fluidly communicates with the oil returning channel and the hydraulic oil keeps returning to the oil storage container.

Abstract: An automatic oil return structure has a main body assembly mounted between an oil storage container and a housing, and having a pressure regulating blocking unit, a pressure regulating elastic unit, an engaging unit, and an engaging elastic unit. The pressure regulating elastic unit pushes the pressure regulating blocking unit to block a first pressure regulating channel. An engaging groove is formed radially inward on the pressure regulating blocking unit. The engaging elastic unit pushes the engaging unit toward the pressure regulating blocking unit. When a pressure in the first pressure regulating channel is higher than a set value and the pressure regulating blocking unit is pushed away to a set distance, the engaging unit is pushed to engage with the engaging groove of the pressure regulating blocking unit such that the pressure regulating blocking unit is unmovable to avoid blocking the first pressure regulating channel.

Abstract: An automatic oil return structure is provided. The automatic oil return structure has an oil storage bag, a piston, and a main body assembly. The piston has an oil storage chamber. The main body assembly has a main channel, a piston oil channel, a pressure regulating channel, a control channel, an operation channel, a minor channel, and an oil return channel. When the pressure of the main channel achieves a limit pressure, the pressure pushes the control blocking assembly away such that the pressure regulating channel communicates with the communication channel, and the pressure also pushes the operating assembly away such that the minor channel communicates with the return channel. At the same time, the pressure of the oil storage chamber pushes the oil blocking assembly, so as to isolate the oil storage chamber from the main channel, and the oil storage chamber communicates with the oil return channel.

Abstract: A crimping device for a cable terminal has a crimping base, a driving assembly, a die mount, and a connector. The connector connects the crimping base and the die mount. The die mount is driven by the driving assembly to linearly move back and forth. A mutual pulling force is formed between the crimping base and the die mount. When compressing, deformation of the crimping base can be effectively reduced, and a service life of the crimping base can be extended. Moreover, the die mount does not move laterally, thereby avoiding the situation that the driving assembly would be failed after long-term used.

Abstract: A driving pump has an oil reservoir, a main assembly, a driving assembly, and a piston. The main assembly includes a first chamber, a second chamber, an exhaust channel, and an exhaust blockage. The exhaust channel communicates with the first chamber and the oil reservoir. When the piston is subjected to an outer reaction force and the driving assembly keeps pushing the first chamber, the oil and the gas in the first chamber may flow back to the oil reservoir. A clamping tool has the driving pump for controlling a clamp. Thus, even if the oil reservoir contains gas and the gas flows into the main assembly with the oil, the gas and the oil can be discharged back to the oil reservoir via the exhaust channel.

Abstract: An engine-driven oil pump has an engine, a pump unit, an oil diverting device, a manual control unit, and a remote control unit. The engine is connected to the pump unit. The oil diverting device is mounted on the pump unit and selectively pumps hydraulic oil from the pump unit into the manual control unit or the remote control unit. With the engine, the engine-driven oil pump can generate power independently instead of relying on external power supply. Besides, the electromagnetic valve of the remote control unit allows the user to remotely control the oil path of the hydraulic oil, so the user is not required to stay along the engine-driven oil pump to manually switch the oil path, and therefore the engine-driven oil pump is more efficient regarding manpower.

Abstract: An engine-driven oil pump has an engine, a pump unit, an oil diverting device, a manual control unit, and a remote control unit. The engine is connected to the pump unit. The oil diverting device is mounted on the pump unit and selectively pumps hydraulic oil from the pump unit into the manual control unit or the remote control unit. With the engine, the engine-driven oil pump can generate power independently instead of relying on external power supply. Besides, the electromagnetic valve of the remote control unit allows the user to remotely control the oil path of the hydraulic oil, so the user is not required to stay along the engine-driven oil pump to manually switch the oil path, and therefore the engine-driven oil pump is more efficient regarding manpower.

Abstract: The present invention relates to a power tool monitored by tracking a motor current and control methods thereof. The present invention is mainly about a microprocessor electrically connected to a motor through a drive unit and a current detecting-and-converting module. The microprocessor receives an AC synchronizing signal, and sends a first control signal to the drive unit according to the AC synchronizing signal to drive the motor. The current detecting-and-converting module detects and converts the motor current and output to the microprocessor, thereby the microprocessor detects a per unit time current which is converted into a corresponding pressure value, and then the microprocessor sends a second control signal to the drive unit according to the pressure value to control the operation status of the motor. By detecting and tracking the per unit time current, the purpose of load monitoring and motor protection can be achieved.

Abstract: A load binder with an enclosed ratchet mechanism and a removable handle consists of an elongated tubular portion, a handle, a ratcheting mechanism, a first threaded shaft, and a second threaded shaft. The first threaded shaft and the second threaded shaft are rotatably engaged to a tubular body of the elongated tubular portion. However, the first threaded shaft and the second threaded shaft do not detach from the tubular body. The tension on a chain that is attached at the first threaded shaft and the second threaded shaft can be adjusted by rotating the tubular body. The ratcheting mechanism is used to control the tubular body about the first threaded shaft and the second threaded shaft. To be protected from dirt and the like, the ratcheting mechanism is enclosed. The handle, which is removable, is used to control the ratcheting mechanism.

Abstract: A load binder with an enclosed ratchet mechanism and a removable handle consists of an elongated tubular portion, a handle, a ratcheting mechanism, a first threaded shaft, and a second threaded shaft. The first threaded shaft and the second threaded shaft are rotatably engaged to a tubular body of the elongated tubular portion. However, the first threaded shaft and the second threaded shaft do not detach from the tubular body. The tension on a chain that is attached at the first threaded shaft and the second threaded shaft can be adjusted by rotating the tubular body. The ratcheting mechanism is used to control the tubular body about the first threaded shaft and the second threaded shaft. To be protected from dirt and the like, the ratcheting mechanism is enclosed. The handle, which is removable, is used to control the ratcheting mechanism.

Abstract: A ratcheting load binder with enclosed ratchet mechanism has an elongated tubular body, a handle, a ratcheting mechanism, and two threaded shafts. The handle is engaged with the tubular body by the ratcheting mechanism, and is perpendicular to the tubular body. A ratchet gear and ratchet pawl of the ratcheting mechanism are enclosed within a housing of the handle. The ratchet pawl is engaged and disengaged from the ratchet gear by turning a ratchet lever outside the housing. The tubular body has internal threads at its extremities that are of opposing handedness. The threaded shafts are engaged with the internal threads within the elongated tubular body. Turning the tubular body by using the handle causes the threaded shafts to move in opposing directions, allowing a chain to be tightened or loosened between two locations by ratcheting the tubular body with the handle. The handle may also be folded for storage.

Abstract: A bending machine has a base and a stage having a movable ram to press a metal plate on the base with a shaping process. The base has an opening corresponding to the ram to allow the ram to pass through the opening. The stage has a pivotal end mounted pivotally with a side of the base, and a detachable end detachably mounted with the other side of the base and adjacent to the opening of the base. When a shaped metal plate tightly clamps the ram, the detachable end of the stage can be detached from the base, the stage can be pivoted to release the ram from the metal plate. Thus, to disassemble the bending machine is unnecessary, and the bending machine is convenient in use and operation and is simple in structure.