Abstract: A two-stage rotary compressor for gas, in particular air. The compressor comprises a bottom plate and a head enclosing between them two compression stages. The compressor is characterized in that an interconnection device is arranged between the two compression stages, said device being suited to establish a communication “in series” or “in parallel”, to be selected by the manufacturer, between said two compression stages.

Abstract: Housingless positive displacement pump assembly comprises one or more vane or gerotor type housingless positive displacement pump units, each comprising pump unit components. One or more retaining rods extend through axially aligned holes in a mounting flange at one end of the pump assembly and the pump unit components to hold the pump unit components in stacked relation to one another and connect the pump assembly to the mounting flange.

Abstract: An apparatus for delivering a viscous material by means of an eccentric screw pump, includes a framework for carrying and fastening apparatus elements, a pump-housing portion for carrying a stator and a rotor in the form of a delivery screw, suction and pressure regions for introducing and discharging the delivery material, respectively, an electric drive unit for driving the rotor in the stator in a first direction of rotation for delivering the delivery material, a control mechanism for activating the drive unit, and one or more releasable retaining members for the rotationally fixed and/or positionally fixed connection of the drive unit and of the stator. A change in the direction of rotation to a second direction of rotation of the electric drive unit, with the retaining mechanism released, gives rise to automatic separation of the pump-housing portion with the stator by virtue of the rotor being unscrewed.

Abstract: A sanitary pump with gear shaft bearing blocks in opposed cylindrical portions of a pump body bore, blocks constituting hand removable structural pump ends. Gear shaft bearings extending completely through blocks for easy cleaning, sealed by O-rings and clamp plates. Oval gear cavity bore between cylindrical portions of body bore extends only length of largest of interchangeable gears. Seals at end of gear cavity eliminate entrapment zones. Minimal intrusion of bearing blocks into gear cavity allows large operating temperature range. Shaft seals are contained in a hand removable cartridge. Complete pump disassembly by one manually operated clamp. Gear shaft diameters differ assuring correct assembly. Mount receives pump, tie rods sealing pump and securing to mount. Mount allows pump removal without changing pump-drive alignment. Pin and groove engagement of pump to mount allows 90° interval pump ports orientation. Pump displacement is altered with interchangeable gears and drive end bearing blocks.

Abstract: In order to achieve high rotational speeds for a drive motor used for surgical purposes without the need for excessive maintenance of this motor, it is proposed that it be in the form of a compressed-fluid-driven, gear-type motor having interengaging gears which are sealed in a housing and have a rotational speed of between 40,000 and 150,000 revolutions per minute.

Abstract: A vacuum pump contains two rotary displacement rotor (8) that engage each other, in particular in a convoluted manner, inside in expansion chamber through which flows a stream in the axial direction. The rotors are mounted in cantilever at the delivery side and are linked each to a driving motor (35, 36). Each rotor (8) forms together with its shaft (20), a stationary bearing body (7) and a bearing (21, 22) delimited by the shaft (20) and the bearing body (7) a module that may be removed as a single unit from the housing (3). The rotor (35) of the driving motor is preferably also part of said module.

Abstract: A cover plate for fluid pumps incorporating an O-ring seal 5 secured in a channel 4. The cover includes slots 7 extending to the edge of the cover plate and securing holes to allow easy positioning of the cover onto bolts which remain located in the body of the pump. These and other securing bolts 8 may have large and knurled heads for rapid finger-tightening so as to avoid the need for tools.

Abstract: A gear metering pump for delivering precise amounts of a compounded elastomeric material into a die. The gear pump has a housing formed with a hollow interior chamber containing a pair of rotating meshing gears mounted on shafts, one of which is power driven, for passing controlled quantities of the compounded material out of the chamber and into the die. A side plate is removably mounted on the housing and encloses an open side of the chamber and is moved between open and closed positions by fluid pressure cylinders mounted on the housing to provide ready access into the chamber for cleanout. A first bearing assembly for the gear shafts is mounted on the removable side plate and retains the gears mounted thereon for removing the gears from within the chamber along with the side plate.

Abstract: A gear pump in which a drive shaft is telescoped into a bore in a spur gear and is held against rotation relative to the gear by means of a key fitting into keyways formed in the shaft and in the bore of the gear. To retain the shaft against axial movement relative to the gear, a spring steel ring is formed with a radially extending slot having a transverse width just slightly greater than the transverse width of the key. The ring is collapsed hoopwise into a groove in the shaft and is positioned such that the slot in the ring is alined axially with the keyway in the shaft. When the shaft is telescoped to a predetermined depth in the bore in the gear, the ring expands hoopwise and snaps into a groove formed in the wall of the bore. The coaction of the ring with the two grooves locks the shaft against axial movement relative to the gear.

Abstract: A rotary pump has a block with inlet and outlet ducts and ports. A pump housing forming a pump cavity and accommodating working means of the pump, e.g., gears, is located on one side of the pump block, whereas drive means such as a magnetic coupling are placed on the other side of the block. In the case of a gear pump, the driving gear is connected to the drive magnet of the coupling through a drive shaft which passes through the axial bore in the block. The drive gear meshes with a driven gear which is mounted on a second shaft, also supported in bushings in the block. One set of ends of the shafts extends outside the pump housing and are inserted into bushings loosely fitted in recesses of a bearing support plate. This plate is attached to the block by removable screws extending through holes in the supporting plate and pump housing.

Abstract: A rotary vane vacuum pump includes a drive unit, such as an electric motor, and a pump unit, preferably constructed as a cartridge pump unit. The drive unit may take any suitable form, but the cartridge unit includes one or more pumping stages plus a pumping stage of small dimension to lower pressure and increase outgassing of the lubricant. The rotors of the rotary vane pump unit are shaftless, that is they together form an axis of rotation without a separate axial shaft and are thus simplified in construction. All of the requirements of oiling, outgassing and gas ballast are fulfilled in the additional stage.

Abstract: A pump, particularly, for pasteous masses, includes a rotatable outer wheel provided with a plurality of inner teeth, a pinion rotatable inside the outer wheel eccentrically thereto and having a plurality of outer teeth, the outer wheel and the pinion forming an intermediate space therebetween, a pressure seqment located in the intermediate space between the outer wheel and the pinion, an inlet and an outlet which are offset relative one another in direction of rotation, and a filling device connected with the inlet, the filling device including a filling container and a feeding element arranged in the filling container and having a feeding direction so as to feed a mass toward the inlet.

Abstract: The tool housing-air motor assembly includes an air motor that is of modular design, that is, it is constructed so that the motor rotor is journaled in the cylinder by the end plates, which retain the motor in its operational alignment condition. The tool housing is used in the "as cast" condition without the necessity for performing any machining operations thereon. The assembly of the air motor and tool housing is possible since the motor is self-contained and does not rely on the tool housing for retaining the parts of the motor in assembled relationship or for retaining the motor parts in operational alignment.

Abstract: A housing for a peristaltic pump including a housing body, a roller assembly, a flexible feeder tube, and a cover, the improvement comprising a cylindrical tongue on the housing and a mating groove on the cover adapted to provide a snap-fit releaseable closure.

Abstract: A lobe rotor pump including a casing (10) and two lobe rotors (16, 18) the rotors each having, coaxial with its axis of rotation, an axially extending cylindrical sleeve (20, 22) formed integrally therewith. A seal (33-37) is mounted in a fluidtight manner within the casing (10) and seals against the outer cylindrical surface of the sleeve. A blind bore (21, 23), which is closed at the rotor end, (24, 25) has therewithin a drive shaft (28, 30) and retaining means (42 to 57) are provided to hold the sleeve and the rotor on the drive shaft with the drive connection engaged, said retaining means being located on the side of the seal (33-37) remote from the rotor.

Abstract: A self-adjusting assembling arrangement, where a shaft can be properly and quickly fitted within a cylindrical body member, which becomes resiliently supported on the shaft. The body member may form part of a rotatory piston member eccentrically mounted within a cylindrical casing, or of a wheel.

Abstract: A cartridge for a peristaltic pump comprises two parts having a frusto-conical bore extending through the two parts and a dovetail section groove encircling the bore at the joint between the two parts. A liquid carrying tube extends into the cartridge and has a convolution encircling the bore. The tube has an integral dovetail section rib extending along the length thereof which engages in the dovetail section groove encircling the bore to locate the tube in the bore. The cartridge is used with a pump having a rotor with one or more rollers mounted eccentrically thereon to rotate about axes convergent with the rotor axis. The rollers compress and flatten the tube where they engage it so that as the rollers rotate around the bore in the cartridge, liquid in the tube is displaced along the tube in a continuous flow.