Abstract: A valve for an automotive brake master cylinder piston is disposed at the end of forward stroke of the brake master cylinder piston in a passage defined along the axis of the master cylinder piston and communicating mutually an oil reservoir and an oil outlet, and is adapted to close and open the passage when abutting upon the departing from a side wall surface of the end of forward stoke of the master cylinder piston in accordance with a forward stroke motion and a return stroke motion of the master cylinder piston.

Abstract: An internal combustion engine charging unit is disclosed which includes a displacement compressor connected to a drive shaft of an internal combustion engine so as to be driven by the internal combustion engine. The displacement compressor is preferably a screw compressor including a main rotor and a secondary rotor. An exhaust gas turbine is connected to an exhaust line of the internal combustion engine. The shaft of the gas turbine is preferably connected to one of the main rotor, secondary rotor or both the main rotor and the secondary rotor.

Abstract: Formerly unpleasant blue smoke was generated in a vaporizer burner for auxiliary heaters for motor vehicles once the fuel supply was cut off and the flame died down, as the remaining fuel was merely heated up, but not burnt. According to the invention the glow plug is activated for a determined period of time during the after-running phase of the combustion air blower. By this means practically all remaining fuel is vaporized and burnt and therefore the forming of blue smoke and remaining residues in the area of the plug muff and/or the burner is avoided.

Abstract: A thin film solar cell with an n-i-p structure has roughened substrate surface and to achieve an improved fill factor, the substrate surface of the solar cell is a multiply concave surface and has no sharp points.

Abstract: A salt forming compound represented by the formula ##STR1## wherein R.sub.1 is C.sub.1 -C.sub.8 alkyl or benzyl, R.sub.2 and R.sub.3 are each C.sub.1 -C.sub.18 alkyl, R.sub.4 is C.sub.1 -C.sub.18 alkyl or benzyl, X is hydroxyl or amino, and Y is hydroxyl or hydrogen and is not hydrogen when X is hydroxyl, usable in a toner for developing electrostatic latent images, e.g. comprising 0.5 to 5 parts by weight of the salt forming compound and 100 parts by weight of a resin.

Abstract: The present invention is related to the provision of an improvement in a process for producing works of sculpture on the basis of a stereophotographic process by arranging a plurality of photogrpahic cameras and a plurality of optical projectors, each being loaded with a transparent screen having a plurality of parallel lines therein, around an object to be photographed at a predetermined object distance, arranging another plurality of projectors operatively around a mass of material to be modeled at such an operative distance of projection that they may be located in a similar position to that of each of the cameras to project the screen therefrom onto the object to take a photographic picture of a striped pattern in the screen projected onto the object, loading the projector with thus-taken picture to be projected onto the mass of material to be modeled, and modeling manually the mass of material to make the projected lines meet and coincide with each other as appeared thereon and to obtain a similar sized

Abstract: A glow plug for diesel engines in which a ceramic heater is supported, with the one end thereof cantilevered toward the outside, by the tip of a hollow holder; the ceramic heater is composed of a U-shaped heating portion and a pair of leads extending backwards from both ends of the U-shaped heating portion, both being formed integrally by an electrically conductive sintered sialon, which is formed by adding a small amount of Al.sub.2 O.sub.3 to a raw meal containing Si.sub.3 N.sub.4 as a principal ingredient, a small amount of AlN polytype and no greater than 5 wt. % of Y.sub.2 O.sub.3, and mixing the addition product with 23-70 vol.

Abstract: It is a question of a piston and cylinder unit comprising a cylinder barrel defining a piston space, a piston able to run axially in said barrel with a support action due to a peripheral bearing surface of the barrel. The piston includes at least one annular running belt which is coaxially arranged thereon along part of the length of the piston. The belt has a surface facing radially outwards which makes contact with the inner bearing surface of the barrel with sliding fit to support the piston, while an inwardly directed surface of the belt bears on an outer peripheral surface of the piston, which is spaced from the bearing surface of the barrel. The belt further has an inwardly directed retainer spur fitting into a groove-like peripheral recess in the piston. The belt is made of a material with resiliently elastic properties and is interrupted at one position on its periphery so that in the fitted condition of the belt there is a closed interruption able to be opened out for fitting purposes.

Abstract: The invention relates to a mounting device for the automatic assembly of prefabricated parts or such as aggregates to a car body from below. For this purpose the aggregates 14 are arranged centeredly, but removably on installation plates 12, which are mounted liftably and in the lifted position floatingly yielding on a mounting frame 9. The aggregates 14 are penetrated by vertical centering journals of the installation plates 12. The protruding part 24 of the centering journal 17 is tapered in its face region and serves to enter an assigned centering bore of the car body 1 while the mounting frame is lifted. As the installation plate 12 is mounted floatingly on the mounting frame 9 in this phase, the aggregate arranged on it moves automatically into an assembly position in which an automatic process can take place.

Abstract: A device for the catalytic cleaning of motor vehicle exhaust gases, comprises a housing having a central region with at least one monolith of a material such as a ceramic, an inner shell is arranged within the housing at least in places. The inner shell extends into at least one part of the monolith containing region of the housing and leads up to the monolith and is secured there. The end of the inner sheel at the end of the housing is free for thermal expansion motions relative to the housing.

Abstract: An internal combustion engine charging unit is disclosed which includes a displacement compressor connected to a drive shaft of an internal combustion engine so as to be driven by the internal combustion engine. The displacement compressor is preferably a screw compressor including a main rotor and a secondary rotor. An exhaust gas turbine is connected to an exhaust line of the internal combustion engine. The shaft of the gas turbine is preferably connected to one of the main rotor, secondary rotor or both the main rotor and the secondary rotor.

Abstract: A supporting device for the mounting of net posts for tennis nets on tennis courts comprises an alignable lever having elastic feet on its lower side. The feet extend flat over the ground of the court toward the horizontal stress created by tension in a net. A support structure is provided for the vertical mounting of a net post. The device has rollers, which are mounted eccentrically of a lever weighted portion and are freely rotatable.

Abstract: An atmospheric electrode is charged by electrostatic induction from a leader stroke which is associated with lightning formation. The electrode is earthed through a varistor which becomes conductive when the value of the tension associated to the electric field at ground exceeds a pre-determined value. In this way, a destructive return stroke, which usually follows a leader stroke during lightning formation, is avoided.

Abstract: The invention provides a control circuit arrangement for solenoid valves, which has a timer adapted to supply the solenoid valve with a higher attraction current during an adjustable time starting with the beginning of a switching signal for the solenoid valve. After the time interval a low hold current flows until the end of the switching signal. For this purpose there is a semiconductor switch adapted to switch the flow of current through the solenoid valve. A logic gate arrangement is connected with an input of the switch and the gate arrangement is supplied with the output signal of the timer arranged to be triggered by the switching signal and the output signal of an oscillation generator. This circuit arrangement makes is possible to reduce a higher attraction current to a lower hold current in a simple and cheap manner, there only being a small overall size and as significant advantages it is possible for the arrangement to be converted for complementary logic.

Abstract: A height measuring device comprises a carriage containing a measuring pin which is moved by a drive motor against an article to be measured in a manner such that the measuring takes place when the pin is held against the article with a precise measuring force. The construction includes a carriage which is supported by an endless belt and moved upwardly and downwardly by driving one of the rollers over which the belt is guided. A ram rod extends through a hollow area of the carriage which is divided by a ring piece into upper and lower chambers, the coil springs are placed around the ram rods in both the upper and lower chambers and are braced between the ring pieces at their one ends and the portion of the carriage which closes each end of the hollow portion of the carriage.

Abstract: The invention discloses a gun barrel with a novel pattern of a rifling curve. The latter proceeds at start of motion from the parabolic curve y=A+Bx+Cx.sup.2 and is supplemented with a constant D, to which is added a freely selectable exponent =d. Due to the freely selected exponent as parameter the ridge force maximum can be displaced at almost equal level between the start of motion and the barrel mouth. At the barrel mouth the ridge force drops to a minimum.

Abstract: The invention relates to a `breech-block` valve for the delivery of cold or hot water with ceramic sealing plates in which a ring which is capable of independent axial displacements is fitted on the base of the valve body in order to take up and compensate for machining play and to stabilize the compacting force on the sealing ceramic plates by means of annular elastic packings independently of the force with which the valve is tightened within the tap body.

Abstract: A piston and cylinder unit provides a supply actuable by means of an actuation device for delivering respiratory air in a respiratory cycle of a respirator. Its piston is sealed with its cylinder by means of a pair of rolling membranes arranged symmetrically with regard to one another. The membranes separate the cylinder contents into an antechamber and a working chamber. The wear of the rolling membranes during the working strokes and especially during the starting is decreased by a clean rolling of the folds. Also a leakage control takes place even during operation and an immediate detection of leaks due to bending stress, aging or other influences is guaranteed. For this purpose an inner chamber which is enclosed by the two rolling membranes is under a pressure different from the pressure in the antechamber and the working chamber so that the highest pressure is on a concave inside of the folds.

Abstract: A device for welding plastic foil strips together with a heating device and a pair of pressure rolls between which the strips are fed, includes a pressure device supported by a spring mechanism for one of two pressure rolls. The pressure device includes a first regulating mechanism for the setting of the width of the gap between the two pressure rolls and a second regulating mechanism for the setting of the welding pressure which is arranged on the first regulating mechanism and which can be moved by it. The regulating units of the two regulating mechanisms are two interacting eccentric elements. This leads to a compact design and only little force is necessary for the setting of the welding pressure.

Abstract: A masting for sailboats, which comprises: at least three poles, the lower end of which are fitted in the bridge or deck of the boat, while the upper ends are connected one to the other to form the vertex of an ideal pyramid whose corners are formed by said poles; and a plurality of stays in tension between said vertex and an anchoring point on the boat, the sails being borne by said stays.