Abstract: Pressure relief valve (1) comprising a valve housing (2), in which a double-side operable cylindrical pressure relief valve spool (3) is housed slidable along a longitudinal axis (4) of a cylindrical bore (5) in the valve housing (2). The pressure relief valve spool (3) can be shifted into a first position by a first force acting on an actuating side (6) of the pressure relief valve spool (3) and can be shifted into a second position by a pressure force acting on a sealing side (7) of the pressure relief valve spool (3). On the sealing side (7) of the pressure relief valve spool (3) a double-sealing, rotational symmetric poppet (30) is located having a rotational axis (34), a first convex sealing surface (31) and a second convex sealing surface (32). The first sealing surface (31) facing away from the pressure relief valve spool (3) is provided for sealing with an external valve seat (11).

Abstract: The invention relates to a displacement unit (1) of a hydraulic machine, for which the hysteresis is reduced. For this purpose, in the control spool (3) and/or at the control spool (3) a mass body (16) and a spring (17) are arranged, which are excited to resonance vibrations. The vibrations are self-excited and sustained by a partial flow rate of the hydraulic fluid which is modulated periodically. The high frequent vibrations are transmitted over the spring (17) onto the associated control spool (3), thereby reducing the friction and hence the hysteresis.

Abstract: Method for deceleration of a hydrostatic transmission 3 driven by a drive motor 2 comprising a closed hydraulic fluid circuit, in which a hydraulic pump 4 coupled mechanically with the drive motor 2 and a hydraulic motor 5 are arranged. Two hydraulic lines 6, 7 connect the hydraulic pump 4 and the hydraulic motor 5 and constitute for the hydraulic motor 5 according to the drive direction of the hydrostatic transmission 3 a supply line 6 and a return line 7.

Abstract: Pressure relief valve (1) comprising a valve housing (2), in which a double-side operable cylindrical pressure relief valve spool (3) is housed slidable along a longitudinal axis (4) of a cylindrical bore (5) in the valve housing (2). The pressure relief valve spool (3) can be shifted into a first position by a first force acting on an actuating side (6) of the pressure relief valve spool (3) and can be shifted into a second position by a pressure force acting on a sealing side (7) of the pressure relief valve spool (3). On the sealing side (7) of the pressure relief valve spool (3) a double-sealing, rotational symmetric poppet (30) is located having a rotational axis (34), a first convex sealing surface (31) and a second convex sealing surface (32). The first sealing surface (31) facing away from the pressure relief valve spool (3) is provided for sealing with an external valve seat (11).

Abstract: Hydrostatic adjusting device of a hydraulic machine, the swept volume of which can be adjusted by way of a servo adjusting unit, having a control unit which has a control cylinder which has at least one inlet for pressurized hydraulic fluid, at least one servo connector for a connecting line to the servo adjusting unit, and at least one outlet to a hydraulic fluid collecting region. A control piston is arranged in the control cylinder, which control piston can be displaced by means of at least one control piston actuator and has control edges. In interaction with control edges which are configured in the control cylinder, the inlet or the outlet can be alternately connected hydraulically to the connecting line, whereby the pressure which prevails in the connecting line can be returned hydraulically via a control line to at least one end side of the control piston.

Abstract: The invention relates to a displacement unit (1) of a hydraulic machine, for which the hysteresis is reduced. For this purpose, in the control spool (3) and/or at the control spool (3) a mass body (16) and a spring (17) are arranged, which are excited to resonance vibrations. The vibrations are self-excited and sustained by a partial flow rate of the hydraulic fluid which is modulated periodically. The high frequent vibrations are transmitted over the spring (17) onto the associated control spool (3), thereby reducing the friction and hence the hysteresis.

Abstract: The invention relates to a displacement unit (1) of a hydraulic machine, for which the hysteresis is reduced. For this purpose, in the control spool (3) and/or at the control spool (3) a mass body (16) and a spring (17) are arranged, which are excited to resonance vibrations. The vibrations are self-excited and sustained by a partial flow rate of the hydraulic fluid which is modulated periodically. The high frequent vibrations are transmitted over the spring (17) onto the associated control spool (3), thereby reducing the friction and hence the hysteresis.

Abstract: Method for deceleration of a hydrostatic transmission 3 driven by a drive motor 2 comprising a closed hydraulic fluid circuit, in which a hydraulic pump 4 coupled mechanically with the drive motor 2 and a hydraulic motor 5 are arranged. Two hydraulic lines 6, 7 connect the hydraulic pump 4 and the hydraulic motor 5 and constitute for the hydraulic motor 5 according to the drive direction of the hydrostatic transmission 3 a supply line 6 and a return line 7.

Abstract: Hydrostatic adjusting device of a hydraulic machine, the swept volume of which can be adjusted by way of a servo adjusting unit, having a control unit which has a control cylinder which has at least one inlet for pressurized hydraulic fluid, at least one servo connector for a connecting line to the servo adjusting unit, and at least one outlet to a hydraulic fluid collecting region. A control piston is arranged in the control cylinder, which control piston can be displaced by means of at least one control piston actuator and has control edges. In interaction with control edges which are configured in the control cylinder, the inlet or the outlet can be alternately connected hydraulically to the connecting line, whereby the pressure which prevails in the connecting line can be returned hydraulically via a control line to at least one end side of the control piston.

Abstract: Monitoring the functioning and/or adjustment of an optoelectronic sensor arrangement (10) exhibiting at least two optical transmitters (S1, S2, S3), to each of which a laterally-resolving optical receiver is assigned, such that each of the optical transmitters (S1, S2, S3) and the corresponding optical receivers (E1, E2, E3) are so positioned relative to each other that a light ray (L1a, L2a, L3a) emitted from the optical transmitter (S1, S2, S3) can be detected by the corresponding optical receiver (E1, E2, E3) after being reflected by a boundary surface (F), which process involves the following steps: a) detecting the current position-proportional reception values for each optical transmitter (S1, S2, S3) and corresponding optical receiver (E1, E2, E3), b) determining the current relative positions for the reception values of any two adjacent optical transmitters (S1, S2, S3), p0 c) comparing the current relative positions for the reception values with stored reference values.

Abstract: An optoelectronic sensor and method for detecting an object in a three-dimensional monitored region uses a plurality of video sensors. Each sensor has a multiplicity of light-receiving elements that are configured to take a pixel picture of the monitored space, and a control unit identifies an object in the monitored space from video data of the pixel picture. Each video sensor has at least one pixel line that is formed by light-receiving elements. The video sensors are spaced from each other so that each sensor monitors an associated plane of the monitored space.

Abstract: An optoelectronic sensor arrangement (1), with a plurality of optical transmitters (21, 22) positioned side by side in an optical transmitter strip (12), such that each optical transmitter (21, 22) transmits the light of a transmitted cone (?1, ?2) into a surveillance area (50), and with a plurality of optical receivers (31, 32) positioned side by side in an optical receiver strip (14), which optical receivers (31, 32) receive the light of a received cone (?1, ?2) from the surveillance area (50), where each receiver (31, 32)comprises a spatially-resolving element (41, 42), such that each optical transmitter (21, 22) and optical receiver (31, 32) form an optical receiver/transmitter pair, and a control unit contains means for determining the optical incident point (L1, L1?, L2, L3) on one of the optical receivers (31, 32) of the transmitted cone (?1, ?2) of each optical transmitter (21, 22) and/or of a foreign light source (G1).

Abstract: The disclosure relates to a safety switching device for a hazardous area defined by motor-driven components, the device being switchable into at least two control stages, wherein in a first control stage at least some of the motor-driven components can be switched into a state of reduced risk potential and in at least one second control stage at least some of the motor-driven components can be shut off, and wherein the safety switching device comprises an apparatus for determining the position of the safety switching device inside the hazardous area.

Abstract: An optoelectronic monitoring device (1) with at least one light source (2) and at least one receiving element (4) which receives light from light source (2) that was reflected by an object. The receiving element determines the distance of the object. A testing unit (5-7) of the monitoring device checks the functionality of the receiving element (4) and modifies light received by the receiving element so that the receiving element (4) receives light which has been falsified by a predetermined or a known amount. A corresponding testing method is also described.

Abstract: A device for optoelectronic monitoring of an object (26) contains a transmitting unit (12) and a receiving unit (14) that are located in a housing (10) covered by a faceplate (16). The transmitting unit (12) emits light beams (24) in a structured illuminating pattern. The illuminating pattern of the illuminated object (26) is recorded on an image recorder (28) by the receiving unit (14). Soiling (38) on the faceplate (16) is indicated by recording the light beams (24) diffusely scattered at the faceplate (16) on the image recorder (28).

Abstract: An optoelectronic protective device for providing switching signals when an unauthorized object is present in a passageway or an opening through a wall. A light source illuminates the opening, and a camera forms a picture of at least one of the wall surfaces defining the opening. A camera forms a picture of at least one of the wall surfaces and directs it onto a position resolving light receiver that generates picture signals for evaluation to determine if an unauthorized project is in the opening. The light source, the light receiver, the camera, as well as a control unit, are mounted in a housing that is configured to be secured to at least one of the wall surfaces of the opening so that it extends only negligibly into the opening, and the light source illuminates a spatial angle and the camera has an angular field of view that are sufficiently large so that objects having a predetermined minimum size present in the opening are reliably detected.

Abstract: Apparatus with an optical system for monitoring a protected field has at least two opposing optical units arranged so that the protected field is between them. Each optical unit includes a picture-taking unit and a processing and switching unit that is operatively connected with the picture-taking unit for generating a danger signal. A marking is applied to each optical unit, and each picture-taking unit is arranged so that the marking on an opposite side of the protected field can be viewed by the first-named picture-taking unit. A processing and switching unit includes a comparison unit for comparing a picture with a reference picture. Each optical unit further has at least one lighting unit for illuminating the oppositely positioned marking on the oppositely positioned optical unit. The picture-taking unit, the markings and the lighting units are arranged in mutual alignment and on a common housing.

Abstract: An optoelectronic sensor and method for detecting an object in a three-dimensional monitored region uses a plurality of video sensors. Each sensor has a multiplicity of light-receiving elements that are configured to take a pixel picture of the monitored space, and a control unit identifies an object in the monitored space from video data of the pixel picture. Each video sensor has at least one pixel line that is formed by light-receiving elements. The video sensors are spaced from each other so that each sensor monitors an associated plane of the monitored space.

Abstract: The invention relates to an optoelectronic sensor arrangement (1), with a plurality of optical transmitters (21, 22) positioned side by side in an optical transmitter strip (12), such that each optical transmitter (21, 22) transmits the light of a transmitted cone (?1, ?2) into a surveillance area (50), and with a plurality of optical receivers (31, 32) positioned side by side in an optical receiver strip (14), which optical receivers (31, 32) receive the light of a received cone (?1, ?2) from the surveillance area (50), where each receiver (31, 32) exhibits a laterally-resolving element (41, 42), such that each optical transmitter (21, 22) and optical receiver (31, 32) form an optical receiver/transmitter pair, and a control unit contains means for determining the optical incident point (L1, L1?, L2, L3) on one of the optical receivers (31, 32) of the transmitted cone (?1, ?2) of each optical transmitter (21, 22) and/or of a foreign light source (G1).

Abstract: The invention relates to a safety switching device for a hazardous area defined by motor-driven components, the device being switchable into at least two control stages, wherein in a first control stage at least some of the motor-driven components can be switched into a state of reduced risk potential and in at least one second control stage at least some of the motor-driven components can be shut off, and wherein the safety switching device comprises an apparatus for determining the position of the safety switching device inside the hazardous area.