Abstract: A vehicle radar system for monitoring a blind spot of a vehicle includes a radar transmitter mounted on the vehicle and a transmitting antenna coupled to the radar transmitter. The transmitting antenna transmits radiation in a pattern into a region adjacent to the vehicle, the pattern comprising a first radiation lobe and a second radiation lobe. A null region of the pattern between the first lobe and the second lobe is directed into the region approximately perpendicular to a longitudinal axis of the vehicle, the longitudinal axis running between a rear end of the vehicle and a front end of the vehicle and running along a line of travel of the vehicle.

Abstract: The present invention relates to a monitoring device (1) with a transmitter unit (2) and a receiver unit (3) for monitoring an area. Slotted cables serve as antennas. According to the invention, a first slotted cable is arranged as a transmitting an antenna (4) for transmitting a pulsed high-frequency signal and a second slotted cable is arranged as a receiving antenna (9) for receiving the reflected signal. The slotted cables are arranged in association with each other and essentially parallel to each other, and the transmitter unit (2) is connected to the first slotted cable at one end of the antenna arrangement and the receiver unit (3) is connected to the second slotted cable at the other end of the antenna arrangement.

Abstract: The present invention relates to a monitoring device (1) with a transmitter unit (2) and a receiver unit (3) for monitoring an area. Slotted cables serve as antennas. According to the invention, a first slotted cable is arranged as a transmitting an antenna (4) for transmitting a pulsed high-frequency signal and a second slotted cable is arranged as a receiving antenna (9) for receiving the reflected signal. The slotted cables are arranged in association with each other and essentially parallel to each other, and the transmitter unit (2) is connected to the first slotted cable at one end of the antenna arrangement and the receiver unit (3) is connected to the second slotted cable at the other end of the antenna arrangement.

Abstract: The present invention relates to a monitoring device (1) with a transmitter unit (2) and a receiver unit (3) for monitoring an area. Slotted cables serve as antennas. According to the invention, a first slotted cable is arranged as a transmitting a antenna (4) for transmitting a pulsed high-frequency signal and a second slotted cable is arranged as a receiving antenna (9) for receiving the reflected signal. The slotted cables are arranged in association with each other and essentially parallel to each other, and the transmitter unit (2) is connected to the first slotted cable at one end of the antenna arrangement and the receiver unit (3) is connected to the second slotted cable at the other end of the antenna arrangement.

Abstract: The present invention relates to a monitoring device (1) with a transmitter unit (2) and a receiver unit (3) for monitoring an area.

Abstract: A method for manufacturing a screen plate with screen slots from a thin plate (1), which screen slots (5, 13) are achieved by cutting. The plate is formed by bending to a screen plate of a desired shape. The screen slots (5, 13) are produced by a laser beam for cutting, which hits the plate from one of its sides, the inlet side. Focus for the beam is situated on a predetermined depth between both sides of the plate. The slot is obtained by at least two cutting operations following each other, in which the direction (3, 4) of the laser beam forms two different angles with the main plane of the plate. There is obtained a screen slot (5, 13), the cross section of which increases against the other side of the plate, the outlet side.

Abstract: In a pressure screening device for separating undesired particles from a fibre suspension a cylindrical screen (2) is provided. The screen has an outer side and an inner side and is provided with a plurality of projections (19) on the outer side of the screen (2) which extend in the circumferential direction of the screen (2), grooves (17) formed on the inner side of the screen (2) and extending in a direction having an axial component, and screening passages in the form of slots (18) disposed in the area of each groove (17) and diverging from the inner side of the screen (2) towards its outer side. According to the invention, the projections (19), grooves (17) and slots (18) of the screen (2) are produced by working of a substantially planar screen plate bent into cylindrical shape subsequent to the working. Thereby it is possible to form a screen (2) having uniform slots (18), the width of which at the inner side of the screen (2) is only about 0.1 mm.

Abstract: A screen plate (1) for screening of pulp suspensions, comprises a number of elongated at least partially curved screen slots (3). According to the invention every screen slot has a width which is maximally 0.8 mm, and the screen slots bend in such a way that a straight rod, which has a breadth which is less than the width of the screen slot and the length which is 5 mm, is prevented from passing through the screen slot, when the rod extends along the screen plate, independently of how this rod is oriented in relation to the screen slot. At that elongated stiff shives may be separated more efficiently by means of the screen plate. This screen plate may also be used for separating a pulp suspension into a first fraction comprising comparatively stiff fibers and a second fraction comprising comparatively flexible fibers.

Abstract: In a hydrocyclone plant for treating fibre suspensions comprising a multiplicity of hydrocyclone bodies (1) each hydrocyclone body is mounted in a hole in a wall (5) and is sealed to the wall with the aid of a sealing ring (18). According to the invention the sealing ring is made of an inexpensive chemical resistant material and is radially cut through, so that two free ends are formed on the sealing ring. The hydrocyclone body is provided with a sealing surface (12) having a radial extension which increases along the hydrocyclone body. Axially along the sealing surface (12) a projection (22) extends between the free ends of the sealing ring. When mounting the hydrocyclone body the sealing ring (8) is adapted to be entrained by the wall (5) along the sealing surface (12), so that the sealing ring is expanded and seals between the sealing surface and the wall.

Abstract: In a hydrocyclone the separation chamber (2) has a circumferential wall (3) provided with at least one turbulence creating member (12), which extends along the circumferential wall and crosses a helical path (10) along which a liquid stream is generated during operation. According to the invention, the turbulence creating member is formed by an offset (12) on the circumferential wall (3). The offset is formed and dimensioned such that said liquid stream substantially loses its contact with the circumferential wall as the liquid stream passes the offset. As a result turbulence is created in a layer of the liquid stream situated closest to the circumferential wall, without the liquid stream developing any substantial flow component directed inward in the separation chamber.

Abstract: A hydrocyclone plant comprises a great number of hydrocyclones (1) arranged in a plurality of separate assemblies (10, 10A, 10B). Each hydrocyclone assembly includes branch pipes (6, 6A), to which the hydrocyclones of the assembly are connected in parallel relationship to one another. There are main pipes (13) of the same number as that of the branch pipes of each assembly, the branch pipes of each assembly being connected to said main pipes, respectively. According to the invention, clamping means (8, 9) are provided for releasably clamping each hydrocyclone substantially transversely against at least one of the associated branch pipes (6, 6A) of the latter, and the individual assemblies include various numbers of hydrocyclones, for optimizing the desired capacity of the hydrocyclone plant.

Abstract: A hydrocyclone plant comprises a multiplicity of hydrocyclones arranged in groups of at least two hydrocyclones, each group being made in a single piece. The hydrocyclones extend substantially radially in an annular space for a liquid mixture to be separated. The inlet space extends concentrically around a cylindrical heavy fraction space for receiving a heavy fraction of the liquid mixture from the hydrocyclones. According to the invention, the hydrocyclone groups are distributed around the cylindrical heavy fraction space in the circumferential direction and are spaced from one another in the inlet space to allow the liquid mixture to flow between adjacent hydrocyclone groups.

Abstract: A hydrocyclone assembly comprises at least one hydrocyclone (1) having at least two through flow members (2, 3) for distribution of liquid between the outside and the interior of the hydrocyclone, and circular cylindrical pipes (4, 5) of the same number as that of the through flow members of the hydrocyclone, the through flow members of the hydrocyclone being connected to the pipes, respectively. According to the invention each through flow member (2, 3) defines an annular end portion (6), which extends around a radial bore (7) in its associated pipe (4, 5) and abuts sealingly against the mantle surface of the pipe via a gasket (8) extending around said bore in the pipe.