Controller and the use thereof
A hydraulic controller having at least one input for a hydraulic fluid for controlling the speed of a hydraulic pump driven by an internal combustion engine is characterized in that the controller has at least two inputs, that at least two pressure chambers each connected to one of the inputs are provided, that each of the same has a piston displaceable under pressure from a rest position against the force of a spring into a switched position and that the piston rod thereof engages at the end of a rod or a pull in the switched position.
1. A hydraulic controller having at least two inputs for a hydraulic fluid for controlling a speed of a hydraulic pump driven by an internal combustion engine, comprising:
at least two pressure chambers, wherein each of said at least two pressure chambers is connected to a respective one of the at least two inputs;
a piston with a piston rod in each of said at least two pressure chambers, each said piston being displaceable under pressure from a rest position against a force of a spring into a switched position,
wherein each said piston rod
extends into a separate chamber, said separate chamber being delimited from the respective pressure chamber and accommodating said spring, and said piston rod abuts a rear bottom of a cup-shaped piston,
releasably engages at an end of a common rod or a common pull in the switched position via said cup-shaped piston and
is arranged to actuate the common rod or the common pull.
2. The controller according to claim 1 , wherein a piston rod guide is provided for each said piston rod leading each said piston rod from the rest position to the switched position.
3. The controller according to claim 2 , wherein each said piston has a larger diameter than the respective piston rod guide.
4. The controller according to claim 1 , wherein the spring abuts a base of the cup-shaped piston opposite said rear bottom.
5. The controller according to claim 1 , wherein the piston rod releasably engages at an end of the common pull, and the common pull is formed as a drawing wire or synthetic rope.
6. The controller according to claim 5 , wherein the common pull formed as a drawing wire is formed as a Bowden cable.
7. The controller according to claim 1 , wherein the end of said common rod or common pull extends into a movement path of each said cup-shaped piston and is displaceable in parallel thereto by said cup-shaped piston when said cup-shaped piston moves into the switched position.
8. The controller according to claim 7 , wherein the hydraulic pump has an intake side and a pressure side which are connected via a return flow path in the form of hydraulic conduits, and the pump is connectable to a hydraulic tool operable via a hand switch of a valve.
9. The controller according to claim 8 , wherein said valve has a switching position connecting the pressure side to the intake side of the hydraulic pump driven to recirculate the hydraulic fluid from the intake side to the pressure side of the hydraulic pump when the engine runs idle.
10. The controller according to claim 1 , wherein a drive control is provided for the engine, which is connected to the end of the common rod or the common pull.
11. The controller according to claim 10 , wherein the drive control is formed as a carburetor of the internal combustion engine.
12. A method of controlling a speed of a hydraulic pump driven by an internal combustion engine and having two pressure sides for respective hydraulic circuits and a controller having at least two inputs is arranged between the hydraulic pump and a tank for taking up a hydraulic fluid, said controller comprising at least two pressure chambers each connected to a respective one of the at least two inputs, each of the chambers having a piston with a piston rod, where said piston is displaceable under pressure against a force of a spring from a rest position into a switched position, the piston rod of each said piston releasably engaging an end of a common rod or a common pull in the switched position to actuate the common rod or the common pull, and each of the at least two pressure sides of the pump being connectable via at least two flow paths in the form of hydraulic conduits to a respective one of at least two hydraulic tools in response to operation of a hand switch of respective tool control valves, comprising the steps of:
driving the hydraulic pump with the internal combustion engine;
actuating said hand switch to direct the hydraulic fluid to the respective one of said at least two hydraulic tools;
moving said piston associated with said respective one of said two hydraulic tools from a resting position to a switched position to drive said common rod or common pull to increase a speed of the internal combustion engine.