Hand-held pressing apparatus
AssigneeGustav Klauke GmbH
InventorEgbert Frenken
Life of this patent
Estimating the term…
Abstract
A hydraulic pressing unit includes a hydraulic pump, supply and hydraulic chambers, moving and stationary parts, a restoring spring, and a return valve provided within or attached to a housing. The moving part is displaced from a starting position into a pressing position as a result of filling the hydraulic chamber with a hydraulic medium from the supply chamber by using the hydraulic pump. The return valve is automatically displaced into an open position as a result of a hydraulic pressure corresponding to the pressing position, and the restoring spring moves the moving part. A piston acts on the flow of the hydraulic medium and lowers the pressure such that the return valve is displaced into the closed position.
Claims14
A motor-actuated handheld pressing unit for performing a pressing operation on a workpiece, comprising:
- a fixed part;
- a moving part;
- a hydraulic cylinder;
- a hydraulic medium provided in said hydraulic cylinder;
- a hydraulic piston mounted in said hydraulic cylinder;
- a return spring mounted in said hydraulic cylinder, said hydraulic piston capable of moving the moving part relative to the fixed part by using said return spring;
- and
- a pressure sensor which detects the pressure of the hydraulic medium in the hydraulic cylinder, wherein said pressure sensor is configured to provide a measured pressure, and said unit is configured to use said measured pressure to determine an actual position of the hydraulic piston within said hydraulic cylinder during a pressing operation prior to contact with a workpiece during the same pressing cycle.
A motor-actuated handheld pressing unit for performing a pressing operation comprising:
- a fixed part;
- a moving part;
- a hydraulic cylinder;
- a hydraulic medium provided in said hydraulic cylinder;
- a hydraulic piston mounted in said hydraulic cylinder;
- a return spring mounted in said hydraulic cylinder, said hydraulic piston capable of moving the moving part relative to the fixed part by using said return spring;
- a pressure sensor which detects the pressure of the hydraulic medium in the hydraulic cylinder;
- a controller, and wherein an electrical line transmitting a signal from the pressure sensor to said controller is branched into two branch lines, one branch line is connected unfiltered to an ADC channel of the controller, and the other branch line is provided with a boosting unit and/or a lowpass filter.
A method of performing a pressing operation of a workpiece comprising:
- providing a motor-actuated handheld pressing unit comprising a fixed part, a moving part, a hydraulic cylinder, a hydraulic medium provided in said hydraulic cylinder, a hydraulic piston mounted in said hydraulic cylinder, a return spring mounted in said hydraulic cylinder, and a pressure sensor configured to detect the pressure of the hydraulic medium in the hydraulic cylinder;
- moving the moving part relative to the fixed part using the return spring;
- and
- measuring the pressure of the hydraulic medium in the hydraulic cylinder using the pressure sensor prior to provide a measured pressure;
- and
- determining an actual position of the hydraulic piston within said hydraulic cylinder during a pressing operation prior to contact with a workpiece during the same pressing cycle using measured pressure.
Dependencies are inferred from the claim text.