Abstract: A foldable baby carriage has a pair of front legs and a pair of rear legs, with each rear leg being pivotally connected to the intermediate portion of the associated front leg and rearwardly downwardly extending therefrom. An angle bar is pivotally supported above the upper surface of each rear leg intermediate between the ends of the latter and has a pusher rod pivotally connected thereto. With the baby carriage in the opened state, the angle bar is substantially in line with the associated pusher rod portion. With the baby carriage in the closed state, the angle bar and the associated pusher rod portion are in bent relation to each other, thus reducing the vertical dimension of the baby carriage and at the same time reducing the distance between the front legs and between the rear legs and the distance between the front and rear legs, thereby establishing the folded state of the baby carriage.

Abstract: The wing blades of a helicopter rotor each are connected to the rotor hub a connection, e.g. a spar being .fwdarw..rarw. including a hinge which is at least fictitious to permit lead-lag movements of the blades <yielding relative to torsion to permit the blade angle adjustment>. A rod, which is stiff in the lead-lag direction and yielding against torsion, is connected in parallel to the connection between the blade root and the rotor hub. One connection of the rod is rigid, for example the connection to the blade root. The other connection of the rod is elastically yielding substantially only in the plane of the rotor whereby a substantial damping of blade movements in the lead-lag direction is accomplished.

Abstract: A device for the feeding of single sheets, for example letterheads, to a xerographic copier instead of the paper supply from a roll. The device is located on a slide-in unit (1) and comprises an exchangeable cassette (4) which holds the supply stack (7). The base of the cassette (6) is tiltable and spring loaded so that the top sheet rests against two friction rollers (10) located above the supply stack (7). The rotation of the friction rollers (10) results in a separation of the sheets of paper by the corner-separators (13). Thereafter, the sheet of paper enters between sets of transport rollers (18, 19), which are magnetically pressed together, and then the sheet is taken over by the feed advance members of the copying apparatus.

Abstract: A guitar synthesizer comprises a guitar portion and a synthesizer portion which are electrically connected to each other. The guitar portion includes strings stretched between a nut and a bridge and pickup means for detecting a string vibration for providing a guitar sound signal. The guitar sound signal is applied to the synthesizer portion. The synthesizer portion comprises a voltage controlled variable bandpass filter exhibiting a passband characteristic variable in at least two frequency regions of the guitar sound signal as a function of a control voltage. A frequency/voltage converter provides a control voltage representing the frequency of the output of the filter, to the variable bandpass filter, whereby the passband characteristic thereof is made adaptively and dominantly responsive to the frequency of the fundamental wave component included in the guitar sound signal and the fundamental wave component is extracted with accuracy from the guitar sound signal.

Abstract: According to the present apparatus work pieces such as railroad wheels are power clamped on a cone shaped inwardly facing side. In a first clamping step clamping areas are impressed into the side or surface of the work piece said clamping areas having a suitable inclination. In a second clamping step the actual power clamping is performed at these clamping areas. For this purpose a plurality of radially moving clamping jaws are arranged to carry at least one clamping tooth. Each clamping tooth in turn is adjustable in its position in an axial direction along its respective radially moveable clamping jaw.

Abstract: A mill, particularly a mill for extracting juice from cane sugar, has a fixed top roller (24), and feed discharge rollers (25) and (26) which are independently pivotable by respective power operated means (47, 51) to vary the feed opening between the feed roller and top roller and the discharge opening between discharge roller and top roller. A trash plate (55) for transferring material between the feed opening and the discharge opening is connected to the feed roller for pivotable movement therewith.

Abstract: A parallel circuit of a capacitor and a switching element is connected to a hot cathode discharge lamp lighting device using a high frequency and high voltage generating means for permitting the flow of current into the filaments of the hot cathode type discharge lamp only at the lamp starting time. The switching element of the parallel circuit is a current controlled resistance element, such as a switching semiconductor, having a break-over voltage V.sub.BO lower than the capacitor terminal voltage during the initial ignition period and higher than the capacitor terminal voltage during the reignition or operation period, whereby the filament current to the discharge lamp may be used for preheating of the filament in the initial ignition period. The filament current may be stopped or reduced by turning off of the switching element by raising the terminal voltage of the capacitor in the reignition period during normal operation.

Abstract: A connecting element for securing a rotor blade to the rotor hub of a helicopter rotor comprises at least two components arranged at an angle relative to each other. At least one component extends outside the boundary of the other component on both sides of the other component. Slots are arranged in at least one of the components and these slots extend substantially toward the shearing center or rather toward the central shearing axis. Additionally, each connecting element has a flattened zone adjacent to the rotor hub to function as a flapping hinge. The connecting element also functions as a lead-lag hinge and as a torsion hinge.

Abstract: A flying object is precisely steered by determining the position of the fng object with the aid of a trigonometric calculation. For this purpose pulse signals emitted in synchronism from two ground stations are received by the flying object and the time difference between the two arrivals is measured. The flying object is also equipped with a clock which is synchronized with the clocks of the two ground stations. Thus, the emitting times are available in the flying object. Based on the measured time difference between the receipt of the two pulses and on the given emission time the coordinates of the actual position of the flying object are calculated. The calculated position coordinates are compared with position coordinates of a rated course stored in the airborne equipment whereby a course deviation signal is calculated. The course deviation signal is then applied to the steering mechanism of the flying object to bring the latter back onto the rated course.

Abstract: The frequency of a pulse signal is measured with the aid of a reference signal generated in an oscillator (11). Both the pulses of the frequency to be measured and the pulses of the reference frequency are counted by separate counters (12, 13) and the counts or counted results are stored in separate memories (14, 15). A flip-flop (21) is set and reset to determine each measuring duration. The difference between two successive counts of the measured frequency counter (14) corresponds to the pulses or rather periods counted during the measuring time duration. The difference between two successive counts of the reference frequency counter (15) corresponds to the length of the measuring time duration whereby the resolution is determined by the reference frequency. A microprocessor (16) divides the number of periods counted by the measuring time duration to ascertain the frequency to be measured which may then be displayed.

Abstract: The efficiency of a chemically fuelled laser with regenerative cooling of its combustion chamber is increased by using the fuels as coolant in the diffuser. The heat resulting from this cooling in the diffuser is supplied in a regenerative manner to the combustion chamber or rather to the laser gas.

Abstract: The present connecting device for joining sheet metal components has a la of synthetic material at least in the area of the contact surfaces with neighboring components thus effectively preventing contact corrosion.

Abstract: The wings of a rotary wing aircraft comprise, for example, four wing blades orming two pairs of wing blades whereby the blades of a pair are located diametrically opposite each other. The blades of a pair are connected to each other by a spar extending from wing blade to wing blade. The spar is operatively secured to the rotor head. Each spar has between the rotor head and the respective wing blade a zone with a torsion yieldability larger than in the spar outside said zone. A beam stiff against bending, bridges the zone, referred to as a torque soft zone, from the wing blade toward the rotor head except for a small flexible section between the rotor head and the radially inner end of the beam. The flexible section permits the blade flapping movements and the blade lead-lag movements.

Abstract: The wing blades of a hingeless and bearingless multiblade rotor are connected to a substantially rigid rotor hub by spar sections elastically twistable and bendable in the flapping direction and in the lead-lag direction. The mounting positions on the periphery of the rotor hub for connection of the spar sections of the respective blades are off-set relative to the angular position of the corresponding blades to which they are connected. Further, the mounting positions for the spar sections of each rotor blade are situated on the periphery of the half side or far side of the rotor hub, facing away from the respective rotor blade.

Abstract: Cable harnesses are manufactured with a so-called cable head arranged on a able laying carriage. The cable head is controlled by an electronic data processor and continuously lays a cable running off a coil or spool, about pins on a cable laying table or pallet. A plurality of such coils or spools are mounted in a cable magazine arranged for cooperation with said cable laying table. Any one of the cables on the coils may be drawn into the cable head which is equipped with cable marking tools and with cable buffer tools. The cable being laid is marked and for this purpose it is "buffered" to such an extent, that a dwell time is obtained sufficient for the marking operation. The buffering takes place first to form a loop. The cable length stored in the loop is used up during the marking so as not to interrupt the feed advance of the cable during its marking.

Abstract: The present drafting apparatus comprises a rail (6) removably secured along the edge of a drafting board. Normally, the rail (6) serves for guiding a T-square (2, 3) which is, for example, pulled against the rail (6) by a magnetic force. If the rail (6) is released from the brackets (8) it may be used together with the trammel heads (7) as a beam compass. For this purpose one of the trammel heads (7) is equipped with a compass needle tip (19) and the other trammel head is equipped with a compass drafting lead tip holder (16). A scale (21) attached to the rail (6) permits the precise adjustment of the radius. Further, the rail (6) when removed from the brackets (8) may also be used as a straight edge for drawing long, straight lines.

Abstract: Off-center load applications to strain gage pick-ups or transducers are substantially compensated by reducing the off-center load application sensitivity of such transducers. This is accomplished by providing the strain gage of the transducer with additional strain gage components which are so located that the effective position of the strain gage device is shifted on its supporting spring body. Thus, although the strain gage device remains physically in position on the supporting spring body, the center of the coordinate system which defines the ordinate of the system can be shifted in any one of the four directions of the system. If the spring body is equipped with a single strain gage only then the point of load application should lie upon the ordinate of the coordinate system what can be achieved by that shifting. If the spring body is equipped with more than one strain gage then the symmetry of the whole strain gage circuitry can be improved by shifting of the respective strain gage coordinate systems.

Abstract: Working screens for centrifugals, especially sugar centrifugals are made by electrodeposition of screen material on an electrically conducting matrix without filling the screen slots. Support material is then deposited on the screen material even to the extent that the screen slots are filled by the support material which is not resistant to an etchant whereas the screen material is resistant to such etchant. Thereafter the screen slots are opened by an etching step. In a modification three separate deposition steps are performed to form screen slots which open rearwardly so that the slot surface is larger on the rear of the screen than on the front of the screen.

Abstract: A built-in connector element is constructed for being anchored in sandwich ype compound panels. For this purpose the connector element has a central threading for cooperation with further connector components and a body with corners forming anchoring fins for holding the connector element in the compound panel. The cornered body is arranged substantially concentrically relative to said threading and has a rounded flange merging into the anchoring fins. The anchoring fins are so dimensioned that the circle enclosing the outer corners of the fins has a diameter which is equal or larger than the diameter of the flange. In one embodiment the central threading is provided directly in the cornered body. In the other embodiment a threaded member is laterally displaceable in the hollow cornered body, whereby the initial insertion of a screw is made easier.

Abstract: The present crankshaft milling machine comprises at least one milling unit which may be controlled in its feed advance drive by a copying mechanism operating in synchronism with the rotation of the work piece. The copying mechanism is movable back and forth along a guide extending in parallel to the longitudinal axis of the work piece along a guide. The guide for the copying mechanism defines a plane which extends substantially vertically on one side of the work piece or crankshaft and in parallel to the crankshaft axis. Each milling unit is tiltably supported on a tilting axis located below the work piece axis and extending in parallel to the work piece axis. The feed advance drive is arranged on the side of the tilting axis facing away from the work piece. The feed advance drive reaches over the work piece, whereby a closed force flow around the work piece is established and the milling forces need not be introduced into the machine bed.