Abstract: An armrest (1) for providing wrist and forearm support during keyboard and mouse operations is provided. The armrest (1) is placed at the front edge of the keyboard and supports most of the forearm from the elbow to the wrist so that the operator can operate the keyboard and handle the mouse, with the forearm supported close to the keyboard. The armrest (1) includes an enlarged support area (12, 22), an elbow protrusion area (13) at the longitudinal ends of the armrest (1), and two mouse pads (2: 21, 22) on the same surface running from the center area (11, 21) to one of the longitudinal ends. The armrest is positioned so that the center area (11, 21) of the mouse pad (2) faces the space bar (4), and the enlarged support area (12, 22) faces the number keypad (5) and projects out to the right of the number keypad.

Abstract: A long handled applicator (10) for spreading lotion in a smooth fashion on the surface of person's body wherein the application (10) includes an elongated tapered housing member (20) having an inboard end (21) and a downwardly angled outboard end (22) provided with a lotion reservoir (28) which communicates with a nozzle element (25) disposed proximate to, but spaced from the outboard end (22) of the housing member (20) which is further provided with a non-porous generally flexible spreader blade member (50) which allows all of the lotion dispensed through the nozzle element (25) to be applied to the surface of a person's skin.

Abstract: Turning case mechanism particularly for cosmetic products, composed of a pivoting body mounted in rotation on a main piece, formed by a traveler, base and hinge elements connecting the base to the traveler, between a lower articulation point with the base and an upper articulation point with the traveler; said traveler intended to be mobile between an open or upper position and a closed or lower position, characterized in that when the traveler is in the lower position, the hinge elements are arranged at least in part below the horizontal plane that contains the lower articulation point.

Abstract: A brush/container combination specifically designed for cleaning tires. A unique sealing disk prevents leakage while a tongue attached to the container cover accommodates the brush used in the tire cleaning operation.

Abstract: A decorative writing implement includes an animal-shaped body having four limbs and a head. Each limb is detachable from the body and retains a pen therein. A rear end of each limb is interferentially fit into a hole defined in the body for mounting the limb to the body. A writing tip of each pen extends beyond a front end of the corresponding limb. Protection caps in the form of a pair of gloves and a pair of boots are detachably mounted to the writing tips of the pens for protection thereof. A further pen is retained in the body with a writing tip thereof extending beyond the head. A cap is detachably mounted to the head for covering and protecting the further pen. Preferably, the animal-shaped body is made of rubber thereby being capable to serve as an eraser.

Abstract: An applicator for applying liquid media has an applicator head (10) attached to a stem (1). The applicator head (10) includes a spherical applicator freely rotatable on an axle (6) which extends at right angles to the stem (1) that is of a length that an operator can hold the stem (1), and rest the surface of the applicator (10) on the ground. The applicator (10) has a porous resilient envelope (11) which surrounds a sleeve (7) located on the axle (6), a reservoir in the stem (1) charges the porous envelope (11) with liquid media.

Abstract: A retractable marking device is provided having a casing in which a coil is tightly wound from which the marking device may be extended for use thereof. A housing may further be provided such that the casing is placed within the housing and the housing is attached to a device on which the marking device is most commonly implemented. The marking device may be a pen, pencil or other writing instrument or may also be, for example, a blunt-ended instrument for use as a pointing-type device. The tightly wound coil maintains the marking device in a retracted position so that the marking device is readily available for use. In addition, the marking device is replaceable with a substitute marking device or replaceable following depletion of, for example, ink contained therein.

Abstract: A scrubbing soap bar that is composed of vegetable oil and glycerine within which is imbedded a length of a thin, fine mesh netting with a portion of the netting extending exteriorly of the soap bar. The portion of the netting that extends exteriorly of the soap bar forms a pocket which facilitates insertion of a human user's finger(s) which facilitates grasping and holding onto the soap bar as the soap bar is used.

Abstract: A ball joint having a cylindrical housing containing a plurality of projections. A cylindrical ball seat is inserted within the housing and secured to the housing by the plurality of projections. A ball stud having a spherical head portion is rotatably disposed within the ball seat, and a cap is disposed at and secured to the lower, outside portion of the ball seat.

Abstract: A fastening device for attachment of, for example, mounting rails to vertical frame profiles of a switchgear cabinet. The frame profiles have rows of evenly distributed fastening retainers. A fastening block, which has fastening retainers for connecting the mounting rail or the like, can be added to the frame profile. In order to secure fastening of the mounting rail on the vertical frame profile, which only requires a small outlay of parts, the fastening block is manufactured either as a punched and bent element from a sheet metal blank or as an extruded element. At least one hook element projects from the fastening block, which can be suspended in an associated fastening retainer of the frame profile. The fastening block has two lateral walls, which extend at right angles with respect to each other and form a common vertical inner edge facing the interior of the switchgear cabinet. The lateral walls are equipped with the fastening retainers for connecting the add-on elements.

Abstract: In an improved child security fence system or pool gate, pole adapters are used for locking together two panels of the fence or pool gate. The pole adaptors are inserted into the support poles of two adjacent fence panels. The two panels are then attached to one another by a lock that bridges the two pole adaptors. The pole adaptors and the lock all have holes drilled through them that align with each other when assembled. Tension clips are positioned inside each pole adaptor so that dimples or tabs extend from the clips and through the aligned holes. In order to disengage the lock, the dimples or tabs from the clips must be simultaneously depressed at four points of the locking assembly.

Abstract: A self-clinching fastener that when pressed into a thin sheet panel provides for a strong attachment point for a cable tie. The inventive fastener relies on the self-clinching process to carry external loads and thus carries larger loads when compared to adhesive backed cable tie mounts. When installed, the self-clinching fastener becomes flush with the far side of the sheet panel.

Abstract: A modular separating barrier element including a frame of generally rectangular structure which is molded from synthetic material and which borders an inner panel having plain regions and regions having perforations and other regions having reinforcing ribs. Detachable feet are coupled rotatably to the lower ends of the shorter sides of the structure of the element. The shorter sides have elements for complementary coupling with other elements of adjacent barriers. Each of the shorter sides may include a pair of projections, those of one of the sides having respective vertical through-holes and those of the other side having respective pairs of coaxial rods which extend vertically and which can be fitted in the holes of the projections of an adjacent barrier element.

Abstract: A barrier comprises posts, an impact-absorbing rail, and a pretensioned steel cable extending in the longitudinal direction of the barrier. The steel cable is arranged in an upwardly open undercut groove in cable holders on the posts. The impact-absorbing rail has the form of a downwardly open sectional rail, which covers the steel cable and the major part of the cable holders. An elongate fibre-optic light guide is fixed to a downwardly directed surface of this impact-absorbing rail.

Abstract: A method for laying a mosaic in which a quantity of n individual mosaic elements are arranged on a common support surface so as to be separated from one another by joints, preferably for laying natural stones to form natural stone paving.

Abstract: A paver screed has a main screed with two outer side walls, at least one of the side walls being provided with insertion orifices for the releasable mounting of at least one lateral screed extension by means of fastening elements capable of being inserted through the insertion orifices. A screed extension has fastening elements that comprise hydraulic cylinders which each have a piston that is spring-biased into an initial, retracted position. The cylinders are actuated by hydraulic fluid to displace or extend the piston against the biasing action of the spring. Preferably, the hydraulic cylinders are connected a hydraulic circuit of the main screed. The piston of each hydraulic cylinder carries a shank capable of being inserted through a proximal insertion orifice and which are preferably provided with an abutment element configured for attaching the cylinder to the sidewall of the main screed.

Abstract: A device for forming a siltation construction comprising a substantially rectangular cloth (1) of water-permeable material, which is anchored on all sides to a water bed by anchoring means. Floating elements (10) are arranged on cloth at a distance from one side (4) thereof and along the other sides (3) are formed pouches (1) open toward the center of the cloth.

Abstract: A deep draft semi-submersible offshore structure suitable for conducting mineral exploration and production operations in deep waters of the oceans. The structure uses three or more caissons or columns equidistantly spaced from adjacent columns. The weight distribution and provision of liquid or solid permanent balance in the lower ends of each column make the structure stable without reliance upon water line displacement or tendons, as compared to conventional vessels. The center of gravity of the structure is maintained below its center of buoyancy, thus imparting an inherent absolute stability to the structure. The columns are retained in spaced relationship to each other by a plurality of horizontal braces or a combination of horizontal braces and diagonal braces. The major part of the structure is positioned below the water surface at sufficient depth to minimize the reaction to surface changes, thereby greatly reducing heave and angular response to surface wave action.

Abstract: An apparatus for use in a pipeline is disclosed. The apparatus has a housing through which pipeline fluids may enter from the rear of the housing, pass through the housing and subsequently exit from the housing. A first bonnet, having several openings, is mounted at the front of the housing on a shaft which is oriented parallel to the longitudinal axis of the housing. A second bonnet is mounted on the housing and fits over the first bonnet. The second bonnet has openings which, when aligned with the openings in the first bonnet, permit the flow of pipeline fluid out of the housing in various directions. The first bonnet is movable in relation to the second bonnet so as to vary the degree of alignment of the openings in the bonnets. By varying the degree of alignment of the openings in the bonnets, the flow of fluids through the housing is regulated so as to control the speed of the apparatus.

Abstract: A tensile system for attachment between a first body and a second body having relative movement with respect to each other includes at least one tensile element attached to the first body and at least one collapsible energy cell coupled between the tensile element and the second body. The collapsible energy cell includes a buckling elastomer spring and has a normal state when the buckling elastomer spring is unbuckled and a collapsed state when the buckling elastomer spring buckles. The tension variations in the tensile element apply a compressive force to deflect the buckling elastomer spring.

Abstract: A method for remedying contamination of a subsurface environment by a non-aqueous phase liquid that is denser than water (DNAPL). The subsurface environment has a resident aqueous phase and a DNAPL phase. A dense aqueous solution that has a density greater than a density of the DNAPL phase is introduced to the subsurface environment. The dense aqueous solution displaces the resident aqueous phase and causes the DNAPL phase to rise above the greater density aqueous solution. The DNAPL phase is then recovered, which substantially remedies the contamination of the subsurface environment.

Abstract: A U-shaped sheet pile comprising a flat flange (10), two flat webs (12) connected to the flange (10) so as to be symmetrical with respect to a plane (8) perpendicular to the flange (10), and an interlocking element located at the end of each of the two webs (12). The sheet pile has a depth/useful width ratio greater than or equal to 0.18. The concave corners (18) defined by the two flange/web connections are significantly flattened by an extra thickness (26) of material so as to obtain a reduction in the resistance of the sheet pile to pile-driving. The extra thickness (26) is sufficient for a fictitious cylindrical surface (38), which has a radius at least equal to 75 mm and which is tangential to the planes extending the inner faces of the flange and the web (32, 34), to be completely located inside the said extra thickness (26) between its two tangential generators.

Abstract: Apparatus includes a pneumatic conveyor for supporting the articles to be conveyed and air under pressure in the conveyor to convey the articles, wherein the conveyor includes a first elongated channel with a first hollow interior volume, a second elongated channel communicating with the first elongated channel and having a second hollow interior volume, with the communication between the first and second elongated channels including openings in the second elongated channel to permit the flow of air under pressure from the first elongated channel to the second elongated channel. Control is provided to control the amount of air flowing through the openings responsive to the density of the population of articles along the conveyor.

Abstract: A cutting insert toolholder for easy indexing in areas of limited access. In an outer end of the toolholder runs a through channel in which a bent bolt is inserted. The channel extends through the toolholder and is open at an outer end of the toolholder.

Abstract: An indexable cutting insert which presents a rake face and a flank face which intersect to form a generally circular cutting edge. At least one of the flank face and the rake face has a visually perceivable indicia thereon so as to indicate a plurality of discrete indexable positions of the cutting insert.

Abstract: Significantly improved resistance to breaking while drilling in metal can be realized in twist drill bits having a web thickness taper which is about twice the web thickness taper specified in Standards and in common use in the industry. This creates much shallower flutes and flies in the face of conventional wisdom in the art which holds that the web taper rate should be low to maximize the amount of flute volume available to convey chips and sawdust out of the hole. A flute length of about 1/2″ less than the flute lengths specified by the Standards makes it possible to have such a large taper rate but still control variations in tolerances for the flute length. It also provides a marking zone for placing size indicia on the drill bit shank outside the portion which is gripped by the chuck jaws of a power drill.

Abstract: A numerical control system for a machine tool comprises a feed speed setting unit, which outputs a signal of a set feed speed of the machine tool, and a feed speed overriding unit, which outputs a signal of a feed speed overriding according to an input of the feed speed overriding. An interpolation unit connects to the feed speed setting unit and the feed speed overriding unit. The interpolation unit determines a command signal of the feed speed of the machine tool by performing interpolation calculations according to he signal of the set feed speed unit and the signal of the feed speed overriding unit. Based upon its calculations, the interpolation unit outputs a target position of each spindle at each sampling time.

Abstract: The invention relates to a motor-driven hand tool for machining of workpieces, in particular planar workpieces, having a guide surface which can be placed on the workpiece to be treated, and a face milling cutter for processing which projects past the guide surface, and which has an axis of rotation extending perpendicularly to the guide surface.

Abstract: A frame for a trailer having a trough is disclosed. The frame has a trough for carrying loads having a curved configuration, such as coils, and a subrail extending longitudinally along the trough. At least one axle can be connected to the frame underneath the trough by connecting it to the subrail. Outside beams extend longitudinally along the frame and are connected to the trough. Slots are provided periodically on either side of the trough which are engageable with safety bars to maintain the longitudinal position of the load in the trough. The frame can be used for a lead trailer or a pup trailer, or both, in a B-train configuration.

Abstract: A threaded fastener is having a raised area or bump on a thread flank. The flank can be positioned on the nut thread or on the bolt thread. The bump forces the mating threads at least on one flank to have near zero tolerances along the pitchline of the threads and thereby eliminating play. A threaded repair insert having at least one raised area on a threaded surface also is provided.

Abstract: A stud comprises a head and a stem with a threaded end length and a length having an axial knurling proximate to the head and adapted to be driven with radial interference into an axial bore of a radial flange portion fast for rotation with the hub of a motor vehicle wheel. The stud comprises at least one knurled surface having an area other than zero in a projection on a plane perpendicular to the longitudinal axis of the stud. The knurled surface is adapted to co-operate with the radial flange portion for preventing rotation of the stud.

Abstract: A substrate handling apparatus includes a transfer elevator and a process station disposed inside a load lock chamber. The process station includes a top module, a bottom module, and a seal ring which is disposed between the top module and the bottom module and is movable to open and close the process station. The transfer elevator has an upper station spaced above a lower station. A transfer device having a pair of transfer arms is used to transfer substrates between the transfer elevator and the process station. The transfer arms are movable toward one another to support a substrate and apart from one another to release the substrate. The transfer arms are mounted to rotate between the transfer elevator and the process station. When a substrate is being processed inside the process station, the transfer arms are disposed on opposite sides of the process station.

Abstract: A method and apparatus for conveying a treatment object whereby a drive unit for driving a treatment object conveyor robot is deployed inside a vacuum chamber. The robot comprises a conveyor arm and a drive unit. The conveyor arm is accommodated outside an airtight vessel and the drive unit is accommodated inside the airtight vessel to avoid damage to the drive unit. In order to raise and lower the robot inside the chamber, an elevator mechanism, deployed outside the chamber, advances and retracts a shaft that is inserted in an airtight manner into the chamber. The airtight structure is secured by O rings provided where a bellows surrounds the shaft and connects to the chamber and the elevator mechanism. The shaft, inserted inside the chamber, is linked to the airtight vessel that accommodates the drive unit of the robot. The airtight vessel communicates to the outside via a hollow portion in the shaft and the interior thereof is always kept at atmospheric pressure.

Abstract: Device for discharging material from a silo (10), comprising a long discharge channel (22) extending centrally over the silo floor (14), and a push-frame (20) which can be pushed back and forth hydraulically over the silo floor (14), over the discharge channel (22), crossways to the longitudinal extension of said discharge channel (22). According to the invention, the push-frame (20) is driven by means of two radially arranged hydraulic cylinders (40) which face each other diametrically inside the silo (10). The hydraulic cylinders can be activated with a push-pull control mechanism, and are each situated in a cylinder housing, said cylinder housing being connected to the silo floor (14). The piston rods (46) of the hydraulic cylinders are arranged so that their opposite front faces (44) fit against a driver bearing (48) from opposite sides, said driver bearing (48) being located in the center of the push-frame (20).

Abstract: An apparatus for unloading open top railroad cars, especially hopper cars, comprising a crawler excavator having a pair of tracked treads and a hinged arm with a bucket thereon able to rotate a fill 360 degrees and to move forward and rearward atop the open top railroad cars, an attachment on the crawler with side extensions to hold the crawler atop the rail cars due to the side extensions slidably resting atop the sides of the rail cars and a portable ramp by which the crawler excavator can mount the ends of the cars.

Abstract: A high density narrow-profile storage system, comprising the steps of: unloading a container from a train car; storing the container in a storage yard substantially adjacent and parallel to a track; loading the container on a buffer in proximity to the storage yard; lowering the container on a chassis of a tractor trailer; and transporting the container away from the buffer. The system can include: a crane; a narrow-profile storage yard substantially adjacent and parallel to a train track; a buffer adapted to receive and raise or lower a container from or onto a chassis of a tractor trailer; and a tractor for transporting the container to or from the buffer.

Abstract: A vehicle restraint employs a 4 bar linkage to lift a restraining member to a position that engages a vehicle thus restraining it at a loading dock. The linkage is upwardly biased to hold the unit in an engaging position and may be retracted by using any of a number of mechanical techniques such as hydraulic electric or pneumatic power. The 4 bar linkage transfers all loading on the unit from the ICC to the frame thus isolating any driven members from overloads. A secondary hook mounted to the 4 bar linkage is pivotally spring loaded to limit vehicle travel away from the dock and to extend the capture range of the device in the case of ICC's bars that are damaged or mounted at non-standard positions at the rear of the vehicle.

Abstract: A restraining member for use with a vehicle restraint for releasably securing a parked vehicle to an adjacent structure is disclosed. The restraining member is pivotally mountable to the vehicle restraint, and is shiftable between a retracted position in which the restraining member is disposed within the recess, and an extended position in which the restraining member is positioned to engage the ICC bar of a parked vehicle. The restraining member comprises a base pivotally mounted to the carriage, a crown, and an offset shank interconnecting the base and the crown. The crown, the shank, and the base each have inner edges, which cooperate to define an open, substantially tetragonally shaped, area sized to receive the ICC bar. The crown and the shank define an engagement portion which is adapted to receive and engage a wide variety of ICC bar sizes.

Abstract: A bulk mail processing system (10) conveys bulk mail containers (C) from a receiving station (R) at which the container is placed on a conveyor (12) to an unloading station (D) at which the contents of the container are dumped. A video camera (22) obtains an image of the container which is transmitted to a processor (24). The image is processed to determine if residual mail (M) is left in the container after it is emptied. A mechanism (18) removes the container from the conveyor, empties the container, and then returns the container back to the conveyor. A controller (20) controls operation of the emptying mechanism. The controller is responsive to an input from the processor that all the contents of a container have been removed to replace the empty container on the conveyor.

Abstract: An apparatus (10) for simultaneously inverting a plurality of semiconductor devices includes a conveyor (12) for conveying an input tray below a frame (32) having a primer tray captured therein by tray captivators (64). The input tray is elevated by an elevator (20) and the primer tray is lowered by lowering the frame (32) until the trays are closely adjacent. After the tray captivators (64) release the primer tray, tray clamps (44) are moved inwardly to extend over the sides of the trays, and jaws (52, 56) are moved to clamp the trays together. The frame (32) is rotated to invert the clamped trays. The input tray s then captured by the tray captivators (64) as the tray lamps (44) are released and acts as the primer tray for the next operation. After release of the tray clamps (44), the ay including the devices in an inverted orientation is lowered to be conveyed by the conveyor (12).

Abstract: A lifting device that can be installed in the frame of a motor vehicle is disclosed. A portion of the frame is removed to accommodate the lifting device and the motor vehicle has a subframe attached under the existing frame across the location where the lifting device is installed to structurally support the motor vehicle. In order to fit within the space provided by removal of a portion of the frame, and provide clearance for the van underneath, the lifting device has a movable frame and a platform having a telescoping movable portion. A single driving unit is used to move the telescoping portion out from the stationary portion of the platform and then extend the movable frame from a stored configuration to an extended configuration.

Abstract: A wafer support device is provided. The wafer support device includes a susceptor having a surface configured to support a bottom surface of a wafer. The susceptor has a plurality of guiding recesses. The wafer support device also includes a pin lift that has a plurality of pins extending therefrom. The plurality of pins is configured to be passed via the plurality of guiding recesses of the susceptor to engage the bottom surface of the wafer. The susceptor is configured to be moved relative to the plurality of pins in a direction substantially orthogonal to the surface of the susceptor.

Abstract: A transfer robot includes a first pantograph assembly, a second pantograph assembly, a handling member carried by the second pantograph assembly, a rotation-transmitting mechanism for associating the first pantograph assembly with the second pantograph assembly, a stationary base member, a first shaft and a second shaft which are rotatable about a vertical axis. The transfer robot also includes first and second driving devices associated with the first shaft and the second shaft, respectively. The second pantograph assembly is offset toward the vertical axis relative to the first pantograph assembly.

Abstract: A component suction method including feeding components (8) accommodated in component storage spaces (9c) of a tape base (9a) to a predetermined position, lowering a nozzle (7) capable of sucking the components supplied to the predetermined position, stopping the nozzle (7) at a predetermined distance from an upper surface of the tape base, pushing an undersurface of the component up when the nozzle is at a bottom dead center position or a position adjacent to the center, vacuum-sucking the component by the nozzle at the bottom dead center position or at the position adjacent to the center, and moving the component sucked by the nozzle to a predetermined position of a board after the vacuum-sucking.

Abstract: The laser printer 1 is provided with a sheet stack portion 5 on which recorded sheets discharged through a discharge port 6 are stacked, and feed rollers 7b which slide the stacked sheets so as to move away from the discharge port 6. The laser printer 1 performs the slide of the stacked sheets on the stack portion 5 by detecting the height of the stacked sheets or counting the number of stacked sheets and operating the feed rollers 7b based on the detection or count result.

Abstract: A two way operated storage system including a container storage area in the form of a multi-rack, multi-tier rotary storage carousel, a vertical lift for transporting containers vertically to a shuttle that transfers containers to and from the storage carousel. Storage carousel is supported on two straight tracks separated by a non-supporting distance. The rotary storage carousel and the shuttle are mechanically and synchronously interlocked such that the storage system can be operated in two different directions.

Abstract: A tilt mechanism for periodically tilting a cassette configured to hold a plurality of wafers or workpieces such that the wafers or workpieces become gravity-loaded against a rear portion of the cassette. The tilt mechanism is mounted entirely above a worktable of a CMP or other processing machine and comprises a housing which houses a circular cam having a spiral groove formed therein. A tilt arm is pivotally mounted to the housing and extends vertically between a lower end which is adjacent the cam and an upper end which is fixed to a platform supporting a cassette holding a plurality of workpieces. A cam follower is attached to the lower end of the arm and projects into the groove. Rotary motion of the cam effects pivotal movement of the tilt arm which, in turn, effects tilting of the support platform and the cassette.

Abstract: A turbine impeller pump assembly includes a rotating shaft and inboard and outboard casing members coupled together with each having cavity channels, and an annular recess, and an axial opening to receive the rotating shaft. Inboard and outboard liner members are structurally arranged to be received by the annular recesses in the casing members and an impeller member is positioned between the liner members and keyed for rotation with the shaft. The inboard and outboard liner members each have at least two flow channels structurally arranged to cooperate with the cavity channels to provide equal and opposite pressures on the impeller to maintain the impeller in alignment with respect to the liner members.

Abstract: A plurality of passages are spaced one from the other along the length of a trailing edge of a nozzle vane in a gas turbine. The passages lie in communication with a cavity in the vane for flowing cooling air from the cavity through the passages through the tip of the trailing edge into the hot gas path. Each passage is partially turbulated and includes ribs in an aft portion thereof to provide enhanced cooling effects adjacent the tip of the trailing edge. The major portions of the passages are smooth bore. By this arrangement, reduced temperature gradients across the trailing edge metal are provided. Additionally, the inlets to each of the passages have a restriction whereby a reduced magnitude of compressor bleed discharge air is utilized for trailing edge cooling purposes.

Abstract: A centrifugal pump has an impeller rotatable by means of a drive shaft. The impeller has a plurality of radially extending vanes connected to a hub and a partial back shroud with sharpened leading edges. The pump has a pump casing with a back plate adjacent to the back side of the impeller. Spiral grooves on the back plate interact with the sharpened edges on the back shroud to aid in protecting the area between the back plate and the impeller by cutting of solids and expulsion of solids through an output port. Preferably the leading edges on the back shroud are also serrated and beveled and the spiral grooves are outward threaded. A disintegrator is preferably mounted on the end of the drive shaft in the conical intake of the pump. Also, cutting bars on the front plate of the casing project into the pump intake and interact with front edges of the vanes to cut incoming solids in a liquid mixture.