Abstract: The invention relates to an apparatus for the floatable guiding of webs of material by air blown against the web. The apparatus comprises blowing boxes 2-6 disposed offset in relation to one another above and below the web 1 of material. Each blowing box 2-6 has two opposite rows of blowing apertures 21 whose blowing direction encloses an acute angle a2 with a deflecting surface 25, 26 which adjoins the edge of the blowing aperture 21 remote from the web 1 of material. The deflecting surface 25 also encloses an acute angle a3 with the web 1 of material. The two acute angles a2, a3 are so selected that the air blown out of the blowing apertures 21 is guided away the deflecting surfaces 25 and against the web 1 of material, where it spreads out in the form of a source flow 30. In this way both a strong air cushion supporting the web 1 of the material is obtained and also a high heat transfer at the web 1 of material and a clearly-defined flow of the blown air from the air cushion.

Abstract: A combined surgical drill guide and retractor is useful for treating fractures in the craniomaxillofacial region. The device comprises an L-shaped member having a first short leg and a second long leg, a major retractor extending away from the first leg in a first direction and a minor retractor extending away from the first leg in an opposite direction, an outer sleeve mounted on the first leg, an inner sleeve telescoped within the bore of the outer sleeve, and a lever hingedly mounted on the second leg of the L-shaped member for carrying out a scissoring movement in cooperation with the second leg. The major retractor and the minor retractor cooperate so that when they are inserted into an incision, they will retract the sides of the incision. The major retractor has an arcuate C-like shape so that it can extend around and behind a bone and thus act as a protective stop to prevent a drill bit from penetrating beyond the bone being drilled.

Abstract: A forming apparatus for the manufacture of casting molds made from sand or another moldable mixture by means of a pressure shock wave from a gaseous medium is proposed. The forming apparatus comprises a structural frame constructed from columns, cross beams, and longitudinal beams, a forming combination within the structural frame, and a pressure vessel for producing the pressure shock wave. The pressure vessel is located above the forming combination and is supported by the cross beams of the structural frame. The forming apparatus also includes a filling vessel containing a supply of sand or other moldable mixture for delivery to the forming combination. The filling vessel is located above the forming combination and is supported by the cross beams of the structural frame is such manner that the topmost edges of these cross beams lie in substantially the same plane as the bottom of the filling vessel.

Abstract: Blocks with a casing composed of upper and lower parts are produced by inserting the upper and lower parts in an inserting device above and below pushing elements between upper and lower pressing dies of a press, displacing by the pushing elements the lower part in a chamber of a mold towards the lower pressing die and the upper part towards the upper pressing die with self-releasable holding on the latter, withdrawing the inserting device from a pressing region between the upper and lower pressing dies, and cyclically repeating these steps in synchronism with a working stroke of the press.

Abstract: An electrophotographic printing apparatus capable of printing continous half-tone images comprises a photoconductive element on which a latent image is to be formed, a laser light beam light source for projecting a beam spot on the photoconductive element, and a driving circuit connected to the laser beam light source for varying the power output of the laser beam light source. The photoconductive element is a digital photoconductive member that is characterized by undergoing a transistion from a first substantially constant surface potential to a second substantially constant surface potential only in regions where it is illuminated by light above a predetermined threshold level.

Abstract: A liquid friction coupling comprises a housing that contains a viscous liquid, a shaft protruding into said housing, alternating and interdigitating inner and outer blades, which are axially slidably and non-rotatably connected to the shaft and to the housing, respectively, annular expanding springs, which extend between adjacent inner blades or outer blades, and an annular piston, which is sealed in the housing and axially displaceable therein and is operable from the outside and arranged to act on the blades in order to change the blade spacing. In order to increase the range in which the blade spacing can be controlled and possibly to permit the coupling to be used as a clutch coupling, the volume of the viscous liquid which is contained in the housing equals the total volume of the free spaces in the housing outside the outer periphery of the inner blades when the piston is in the position which corresponds to the largest blade spacing.

Abstract: A wheel suspension for vehicles comprises for each wheel a wheel control arm, which is pivotally movable against the torsional force exerted by a torsion bar. The torsion bar extends transversely to the wheel control arm and is fixed against rotation at a distance from the wheel. In order to reduce the manufacturing costs and the weight of the wheel suspension, the wheel control arm and the torsion bar are integrally combined in an L-shaped component, which is provided adjacent to its apex with a pivotal mounting, which together with mounting for non-rotatably fixing a free end of the torsion bar defines a pivotal axis for the wheel control arm.

Abstract: Disclosed is a demodulator for a phase-modulated wave, of the DPSK type for example, applicable to an MLS system. It has a local oscillator, the phase of which is modulated. The signal thus modulated is mixed with the incident signal to be demodulated. The signal coming from the mixer is applied to a loop, the output signal of which:controls the phase modulator;constitutes the output signal of the device.

Abstract: A machine for denesting stacked packaging baskets receives a stack of nested packaging baskets via a first conveyer belt. The stack of packaging baskets lies on its side. A gripper is reciprocatingly moved along a trajectory toward and away from the stack. During each reciprocating motion of the gripper, the first basket in the stack is gripped and removed by the gripper from the stack. The denested basket is then rotated into an upright position by engaging against a turning rod located above the trajectory of the gripper. The uprighted basket is then deposited on a second conveyer belt for transport to a location where product is added.

Abstract: A device for measuring a weak magnetic field is disclosed. The device includes a substrate, a magnetic core having a high magnetic permeability and in the form of a surface film on a substrate, and at least two coils magnetically coupled to the magnetic core. A pulse generator is connected to one of the coils and is used to drive the magnetic core into intermittent saturation. The other coil is used to generate an output signal. The device can be used for measuring the weak magnetic fields associated with bank notes for identifying the values of the bank notes.

Abstract: A motor vehicle comprises two driven axles, one of which is adapted to be driven by a drive train, which comprises a liquid friction coupling, which is preceded in said drive train by a clutch, which is adapted in a first position to cause the rear axle to be driven via said liquid friction coupling, in a second position to by-pass said liquid friction coupling and in a third position to disconnect said rear axle from said drive train. In a motor vehicle comprising a transmission comprising at least one cross-country or crawling gear the clutch is adapted to assume said second position under the control of a pick-up, which is associated with the cross-country gear or gears, a switching and control stage, and an actuator in response to the selection of the cross-country gear or one of the cross-country gears. That actuation is independent of the position previously assumed by the clutch. The clutch will remain in that position until a road gear is selected in the transmission.

Abstract: Superabrasive cutting elements, backed compacts and methods for their manufacture are disclosed wherein metal coated superabrasive particles are cemented under HPHT conditions. The superabrasives bond to the metal of the coating and the metal coatings of adjacent particles bond to each other forming a matrix. A binding aid with thermal expansion characteristics close to that of the superabrasive particle can be infiltrated through or otherwise mixed with the particles to assist in the bonding between the metal coatings and to fill in voids. Catalyst and non-catalyst binding aids can also be used. Uncoated, smaller superabrasive particles can be interstitially dispersed among the coated particles to increase the superabrasive concentration and can self bond to form a cemented/sintered structure. Tungsten is a preferred metal coating and silicon is a preferred binding/sintering aid. The superabrasive can be diamond, cubic boron nitride, boron doped diamond or crushed sintered polycrystalline aggregates.

Abstract: In a multi-roll stand having laterally supported working rolls 4, each working roll 4 is supported at at least one side against a radially unmounted lateral intermediate roll 5, which, for its part, is supported against a first, radially mounted supporting roller 6 and a further, radially unmounted intermediate roll 7. The further intermediate roll 7 is supported against a second, radially supported supporting roller 8 and against that intermediate roll 3 of a six-high roll stand which supports the working roll 4 vertically or against the supporting roll of a four-high roll stand. By virtue of this type of lateral support, the risk of slip between the working roll 4 and the lateral intermediate roll 5 supporting it is reduced because a torque is transmitted to the intermediate roll 5 from the intermediate roll 3 or supporting roll of the roll stand via the further lateral intermediate roll 7. In addition, the space for the lateral support can be better utilized for an increase in the supporting forces.

Abstract: A process for single-pass multi-color electrophotographic printing comprising the steps of forming first and second electrically charged oppositely polarized, latent images on a dielectric-covered photoconductive printing. First and second toners, oppositely charged and differently colored are applied to the first and second latent images, forming first and second toned images having different colors and different polarities. The toned images are then similarly charged and transferred to a print medium.

Abstract: An electronic modular unit such as an integrated semiconductor unit is disclosed. The inventive electronic unit can be bonded to a support or to another modular unit. For this purpose, the inventive unit is provided with projections or recesses so that units can mate with one another. The projections may be formed by an etching process. Electrical connections as well as mechanical connections between units may be achieved using the projections and recesses.

Abstract: A self-erecting tent can be erected in various sizes and shapes and is characterized by the fact that the tent can be changed. It can be mounted on a transportable or rolling and supportable platform, which can be converted from a transport position into an erection position. The tent consists of a telescopic support mast and a plurality of telescopic arms, the folded roof fabric being connected to the endmost extended element of each arm in order to provide tension and support when it is extended and foldability when it is retracted.

Abstract: A novel infiltration alloy comprises about 5 to 65% by weight of manganese, up to about 35% by weight of zinc, and the balance copper. Preferably, the infiltration alloy comprises 20% by weight of manganese, 20% by weight of zinc, and the balance copper. The infiltration alloy is useful in the manufacture of matrix bodies such as matrix drill bit bodies. A method for the manufacture of a matrix body comprises forming a hollow mold for molding at least a portion of the matrix body, positioning diamond cutting elements in the mold, packing at least a part of the mold with a powder matrix material, infiltrating the matrix material with the novel infiltration alloy in a furnace to form a mass, and allowing the mass to solidify into an integral matrix body. Because the novel infiltration alloy permits infiltration to be carried out at temperatures below about 1050.degree. C., many diamond cutting elements which begin to deteriorate at temperatures above 1000.degree. C.

Abstract: A cylindrical-roller bearing comprises, associated with at least one of its external and internal races, a retaining member for the rollers of the bearing. In order to lower the friction component and provide better conditions for assembly of the bearing, and to simplify manufacture, at least one of the retaining members is constituted by a retaining ring of synthetic plastics resin material being in snap connection with the respective bearing race with which it is associated.

Abstract: A cooling/heating and power generating device utilizes waste heat from an automobile to produce an auxiliary energy source for driving various accessories such as a cooling/heating apparatus, an electric generator, a super charger and the like. Waste heat is dissipated from the engine by waste gases in an exhaust tube and by a cooling fluid circulating between the engine and a radiator. The inventive cooling/heating and power generating device comprises a heat absorber disposed between the engine and the radiator, a heater mounted on the exhaust tube, and an expansion turbine. A cooling medium is heated in the heat absorber by the cooling fluid of the engine, and in the heater by the waste gases in the exhaust tube. The heated cooling medium drives the expansion turbine thus providing a source of power auxiliary to the engine for driving an electric generator, a super charger, etc. After driving the expansion turbine, the cooling medium is condensed and pumped back to the heat absorber.