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Hermann Hemscheidt Maschinenfabrik Gmbh & Co.

Hermann Hemschedit Maschinenfabrik Gmbh & Co.

Hermann Henscheidt Maschinenfabrik Gmbh & Co.

Karl Krieger, Deceased

Werner Reinelt

Wolfgang Kobow

Guy Geuns

By Hildegard Krieger, Legal Representative

A 2-port, 2-directional hydraulic valve is disposed alongside a pulse generator in a casing, the actuating force of the pulse generator being transmitted to a push rod of the valve for actuating the latter via a two-armed lever mounted like the beam of a balance. A threaded bore in one lever arm receives a bush which is adjustable in the direction of actuation and contains a spring-loaded pressure member. A set screw can be used to pre-stress the spring and thus exactly adjust the transmitted actuating force, while the adjustable bush is used for pre-setting the actuating travel.

Hydraulic valve actuating device

The invention relates to a method and system for supplying devices which are charged with a fluid pressure medium as a working medium with electrical energy for actuating electrical parts of the device, wherein an energy converter is subjected to the fluid pressure medium in such a way that a fraction of the energy of the fluid pressure medium is converted into electrical energy which is then stored in an electric store.

Method and system for the production of electrical energy by means of a

The invention concerns apparatus for the determination of the length of stroke of a piston in a working cylinder, especially in a hydraulic, walking, mine-roof support. For this purpose a piston shaft is rotatably mounted in one end portion of the working cylinder and extends into a hollow cylindrical piston rod of the piston. Through a pin on the piston or piston rod which engages in a helical guide groove on the piston shaft, the latter is rotated during movements of the piston. The piston shaft is connected to a code plate provided with a pattern of holes and displaceable on rotation of the shaft between light-emitting elements on one side and light-detecting diodes on the other side. The combination of irradiated and darkened light-detecting diodes represents a digitally-detectable binary numeral sequence which corresponds to a specific piston position.

Piston stroke digital determination means

A change-over valve for hydraulic walking mine-roof supports comprises a valve housing containing a sealed-off operating piston in which a valve member supported on a helical spring is displaceably arranged, the piston being responsive to the supply of small quantities of hydraulic fluid through an end connection in the housing and having a sealing cone adapted to close a connection of large throughflow cross-section at the opposite end of the housing which also has a side connection for the supply of pressurized fluid to a working cylinder of a mine-roof support, the large throughflow cross-section at the connection thereby guaranteeing brisk pushing-in of a piston rod of a piston in the cylinder.

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Wuppertal, Germany

Karl Krieger, Deceased