Abstract: The thrust nozzle opening angle of two cycle gas turbine jet engines is controlled in a system which comprises a low pressure compressor driven by a low pressure turbine. A first compressor is arranged radially inward for a first flow cycle or circuit and a second compressor is arranged radially outward for a second flow cycle or circuit. A high pressure compressor is driven by a high pressure turbine. A combustion chamber is situated upstream of the high pressure turbine. An afterburner is supplied with the turbine gases from the first, hot flow cycle and with compressed air from the second, relatively cool flow cycle or circuit. The system may have multiple shafts. The control is effected with reference to the instantaneous pressure relationship (.pi.NVZ) between the static pressure (p.sub.sD) downstream of the radially outer compressor (1a) of the second flow cycle (k2) and the static pressure (p.sub.sE) of the air flowing into the propulsion system. This ratio constitutes a variable rated control value (.

Abstract: A timepiece having a game function preferably includes a single display having a figure displaying region and a numerical value displaying region. A game mode is established upon operation of a game start switch. The figure displaying region includes an arrangement of a plurality of figure displaying segments and a predetermined one or a certain number of segments out of the plurality of segments is selectively activated for a display responsive to an operation of a game operation switch in the game mode, whereby a figure representation on the display is changeable in response to the operation of the game operation switch. A score counter evaluates a score of the game in response to the change of the figure representation. Upon operation of the game start switch, the content in the score counter is displayed by the numerical value displaying region.

Abstract: A do-it-yourself spiral staircase has a central column (1) made of a hollow steel tube or pipe, which extends between a support (2; 7; 16) on a lower floor and a landing plate or end tread (3) on an upper floor of a residence or office building. The individual treads (4) are distributed along the column between spacer sleeves (5; 5'). The steel tube or pipe is divided into two tubular sections, of which one tubular section (11; 15; 15'; 20) has an excess length and can be shortened at its free end for adjustment to the required height of the spiral staircase to the size required at the construction site, whereas the other, ready-made tubular section (10; 18) is telescopically attached to the tubular section which has been shortened. At least two mutually aligned or registering bores are provided. Each bore passes radially through its respective telescopically engaging tubular parts.

Abstract: A landing gear for loads including cargoes and/or personnel is removably ured to the load. At least one tiltable jet engine forms part of the landing gear and automatically controls the descent movement. A stabilizing mechanism forms part of the landing gear and provides a positioned control for the landing gear and load during descent. Preferably two solid fuel rockets are provided for supporting the load during descent. The rockets are tiltable about an axis extending across the longitudinal axis of the landing gear. The tilting is controlled by a computer on board in accordance with a program present in the computer whereby the landing is substantially independent of local wind conditions and other external factors.

Abstract: The invention relates to a circuit arrangement for producing a low frequency alternating current, such as is particularly used for electric massaging. Any desired frequency characteristics and beats may be produced by the interconnecting of several generators having different, adjustable fundamental frequencies, and by an adjustability of the coupling components. These frequency characteristics and beats have proven to be particularly effective. Above all, the components of the line frequencies of 50-60 Hz, which are dangerous to the human body, are avoided.

Abstract: A flying body such as an aircraft or a re-entry vehicle is enabled to land substantially horizontally with the aid of one or several glider parachutes also referred to as paragliders, which are stored in an upper body zone and ejected during the landing. The lift capacity of the paraglider is so dimensioned that it replaces the lift loss of the wings due to the low landing speed, whereby the weight of the flying body is kept in equilibrium to the sum of the wing lift and of the paraglider lift. The paraglider resistance or drag is compensated by the engine thrust and an ascending or descending flight is accomplished by modulating the engine thrust.

Abstract: A reflection type liquid crystal display unit wherein twisted nematic liquid crystal molecules are used in a field effect mode. A polarizing sheet placed on the upper surface of the liquid crystal display element of the unit is formed with spacer projections geometrically distributed substantially over the entire surface area of the display unit by an embossing process, thereby defining a clearance of uniform predetermined thickness between the polarizing plate and the liquid crystal display element. As a result of this arrangement, formation of interference fringes known as Newton's rings is prevented.

Abstract: A wing is secured to the body of a craft, for example an aircraft, at least t four support points interconnected in pairs by a respective clamping bolt. The metal planking of the upper and lower wing structure forms two wing forks each having a respective securing end and two forked legs. One wing fork is secured with its forked legs to the upper wing structure surface. The other wing fork is secured with its forked legs to the lower wing structure surface. Each of the four support points of the craft body forms a forked bracket so that each support point has two half brackets. The half brackets of a pair are vertically aligned so that the respective clamping bolt may pass through these aligned half brackets and through the respective securing ends of the wing forks extending into the space between two half brackets.

Abstract: A rotor blade, for example for a windmill, comprises a plurality of blade ctions between a blade root and a tip. The sections are interconnected by tensioning members such as steel cables or the like, preferably extending through the blade sections. Thus, each section may be manufactured individually and all components may be assembled at the construction site, whereby relatively large windmill rotors may be constructed.

Abstract: A webbing reinforced by carbon fibers is heated during its resin impregnation by passing an electric current through the carbon fibers whereby the carbon fibers act directly as heating mats in a system of layers of fiber reinforced material. Thus, the use of heated molds has been obviated which is of particular advantage especially for large scale structural components, especially if such components have a complicated configuration.

Abstract: A discharge lamp lighting circuit system comprises a discharge lamp, an intermittent oscillation circuit, and an arrangement for controlling the energy supplied for lighting the discharge lamp with a high power factor. The intermittent oscillation circuit is energized by a low frequency a.c. power supply, i.e. a commercial alternating current power supply, for intermittently generating a high frequency high voltage in each half cycle of the alternating current of the low frequency a.c. power supply. By supplying the low frequency alternating current voltage and the intermittent high frequency high voltage to the lamp the discharge lamp is reignited in each half cycle of the a.c. of the low frequency alternating current power supply and the lit state of the discharge lamp is sustained by the low frequency alternating current voltage.

Abstract: A method of manufacturing an electrical circuit wiring assembly comprises the steps of preparing a first sub-assembly having a metal board chassis and a first circuit element provided with hard stiff leads, preparing a second sub-assembly having a second circuit element provided with soft thin leads and an eyelet terminal for connecting the soft thin lead to the hard lead by means of a soldered junction, and assembling the first and second sub-assemblies by a soldering operation to form a main wiring assembly. In the second sub-assembly the second circuit element and the eyelet terminal are carried temporarily on an unsolderable mounting tool. The first and second sub-assemblies are temporarily coupled to each other during the forming of the main assembly by means of a coupling tool or jig for applying molten solder to an exposed connecting portion of the eyelet terminal and to portions of the hard and soft leads extending from the eyelet terminal.

Abstract: A mass such as a vehicle or craft, for example an aircraft, is cushioned against landing shocks and vibrations by an electronically controlled shock and vibration absorber system. For this purpose an electrical control signal is produced which takes into account several coefficients through the adjustment of potentiometers in a control circuit which continuously controls the damping characteristic curve of the shock and vibration absorber system.

Abstract: The wings of a hingeless helicopter rotor are secured to the head of the rotor by connecting elements of fiber compound materials. Each connecting element has at least two outer layers of fiber compound materials and an intermediate layer of .+-..beta.-fiber compound materials between the outer layers. The intermediate layer is bonded to the outer layers by a suitable adhesive. The intermediate layer takes up the central portion of the securing flange of the rotor head and its axial thickness increases radially inwardly. The intermediate layer has four side lobes which extend laterally out of the confines of the outer layers. These side lobes are connected by bolts to the rotor head. This structure provides a strong connection in which the outer layers are not weakened. Effects of the lead-lag movement of the rotor wings and of any torsion of the connecting elements are minimized and the fictitious hinges are located close to the rotational axis even within the zone defined by the rotor head flange.

Abstract: The operating or running characteristics of a vehicle tire or rim with a tire secured thereto are optimized on one and the same machine. For this purpose the tire or wheel is supported on a subcritically tuned support bridge structure and driven by a spindle with an adjustable r.p.m. The vibrations of the support bridge structure are measured and converted into respective electrical signals representing a wheel unbalance and/or tire non-uniformities while a drum is pressed with a predetermined force against the tire or vice versa. This force is also measured as an electrical signal. An angular position sensor is operatively connected to the tire or spindle and provides an electrical signal representing the instantaneous tire or wheel position relative to a polar coordinate system.

Abstract: A baby walker is provided with a substantially doughnut-shaped upper frame and a seat suspended from the upper frame by three straps. The end of each strap is provided with an engaging bar disposed at right angles with the direction of the length of the strap. The opposite ends of the engaging bar project beyond the widthwise ends of the strap. Attached to the lower surface of the upper frame are adjusting members each having a plurality of downwardly opened recesses. A guide member is provided adjacent each adjusting member and spaced apart from the lower surface of the upper frame. The straps are led from below the upper frame and mounted on the upper surfaces of the guide members, with the ends of the straps being led to the adjusting members. Each engaging bar engages one of the associated engaging recesses. In this state, the load on the seat forces the engaging bars into the innermost regions of the engaging recesses.

Abstract: The present machine tool is constructed for an automatic tool exchange and includes a double column (11, 12) in which a spindle unit (15) and a tool magazine (22) are separately guided for moving jointly. A grapple claw mechanism includes an angular double claw. These features satisfy the hitherto contradictory requirements for a minimal idle time for the tool exchange and for a high machining accuracy by the elimination, among others, of the positioning tolerance.

Abstract: A baby carriage having a pair of front legs and a pair of rear legs. The pair of rear legs each have an angle bar pivotally connected thereto while the angle bar has a pusher rod pivotally connected to the other end thereof. With the baby carriage in the opened state, the angle bar is substantially in line with the associated pusher rod body. With the baby carriage in the closed state, the pusher bar body and the associated angle bar are in bent relation to each other, thus reducing the vertical dimension of the baby carriage. Further, in response to the turning movement of the angle bars relative to the rear legs, both the longitudinal and the transverse spacings between the front and rear legs are reduced. In this manner, the baby carriage is folded.