Abstract:
A pressure differential controlled valve for use in a two stage servomotor to delay the communication between a second pressurizing chamber and a first pressurizing chamber until compensatory fluid, which is lost from the first pressurizing chamber in the transfer of the development of an operational force from a first diameter on a power piston to a second diameter on the power piston is replaced.
Abstract:
An automatic slack adjuster for a cam-operated brake is disclosed. The adjustment mechanism includes a pair of torquelimiting clutch springs. One spring limits adjustment to a predetermined torque level so that large actuating forces generated during a brake application will not overload the adjustment mechanism. The other clutch spring insures that the adjuster will not ''''back off'''' after an adjustment is effected. The adjuster is designed so that manual adjustment may also be effected, either to adjust the brakes or to back the brakes off without disconnecting any part of the automatic adjuster mechanism.
Abstract:
A message tape for instrument display systems includes laminations of metallic and plastic materials. Messages are etched through a metallic lamination and dyes are applied through the etchings to provide color coding without introducing dimensional buildups. The dyes are retained by a plastic backing lamination. The tape has the main advantage of being useful at elevated operating temperatures and ancillary advantages of improved image quality and lighting efficiency.
Abstract:
For use with analog a.c.-to-analog d.c. conversion systems or the like employing balanced demodulators for reducing settling time i.e., the interval between application of a.c. superimposed on d.c. and the provision of a d.c. analog of the superimposed a.c., means for introducing an independent keying signal to force demodulation during part of the settling time.
Abstract:
A part presenter including a plurality of part storage bins arranged in tiers adjacent a slide chute and individual transfer devices mounted over the bins and including pickups which can be projected into the bins to pick up a part and transfer it to the slide chute. Parts fall from the chute into a pusher device which moves the part to a staging location, opens and returns for the next part. Transfer devices drop parts on receipt of external signal, then go back to the bin for another part. The bins are shifted relative to the transfer device and chute support frame to ensure depletion of parts. Control circuitry is disclosed.
Abstract:
A variable inverse period timer computes the inverse period between events, where the repetition frequency of the events can vary greatly. Where the repetition frequency of the events is relatively high the average inverse period of a plurality of events is computed, and where the repetition frequency of the events is relatively low a single inverse period is computed. This is accomplished by providing a digital differential analyzer which generates the locus of possible inverse periods from an initial condition and which is activated a fixed time after the occurrence of a first event. Upon occurrence of an event subsequent to the activation of the digital differential analyzer, the value generated by the digital differential analyzer is essentially multiplied by the number of events which occurred since the first event.
Abstract:
A flexible tension-torsion coupling particularly adapted to connect a helicopter rotor blade to a rotor hub but useful as a connecting medium between two members wherein similar tension and torsion force loads may be encountered. A plurality of flexible tie bars or belts each preferably of filament wound matrix bound form are arranged in circumferentially spaced apart relationship around and parallel to a pitch change axis passing longitudinally through the rotor blade with one end of each tie bar secured to the rotor hub and the opposite end of each tie bar secured to the rotor blade. All forces including cyclic torsion generated forces are absorbed by the plurality of flexible tie bars which are loaded in tension during rotor rotation. A modified form of the tension-torsion coupling has the plurality of flexible tie bars arranged in circumferentially spaced apart relationship around the pitch change axis with half the plurality of the tie bars angularly disposed to the pitch change axis and the other half of the tie bars oppositely angularly disposed to the pitch change axis.
Abstract:
A system and method are disclosed which provide a means for automatically inserting a pin into a tightly fitting hole, the system including a pin holder which supports the pin at one end in either a latched condition in which the pin is fixed relative the holder or in an unlatched condition, in which the pin is allowed to freely pivot about its supported end. The pin holder is positioned with respect to the member having the hole formed therein by means of a positioner device which guides the same to the approximate hole location and to advance the pin at least partially into the hole. IF the pin and hole are not aligned the pin is ''''steered'''' into the correct lateral position by detection and nulling of the reaction forces created by interaction of a pin and/or hole chamfer. If, after having its lateral position so corrected the pin does not completely enter the hole, its axes are not angularly aligned, and a binding condition between the pin and the hole has occurred created by the relative tilt of the pin axis with respect to the hole axis. This condition is detected and a control signal generated unlatching the pin to allow it to freely pivot about its supported end. Upon unlatching of the pin lateral reaction forces are created acting on the pin holder which forces are sensed and an error signal generated therefrom, which signal is used to control the positioner device to move the pin and hole relative to each other in a direction so as to align the pin and hole axes and relieve the bound condition so that further advance of the pin into the hole will be accommodated. This latter process is repeated if a further binding is created and so on until the pin is inserted.
Abstract:
A face plate suitable for uses with an acoustical-optical image tube is disclosed and its method of manufacture. A fused glass capillary array which constitutes a disk having a large number of smooth parallel passages or pores therethrough is metalized, preferably by an electroless plating process, whereby the inside surfaces of all the pores are coated. The resulting layer of gold, silver or platinum may then be increased, if desired, by further plating, after which the disk is cleaned, heated to approximately 470* C. and the pores filled with a sealant such as silver chloride. One or both surfaces may then be lapped to provide a disk having a glass surface but with many conducting cylinders extending therethrough. If it is desired to fill the rings to make circular contacts, the sealant may be etched back from the surface and additional metal added within the rings through a further electroplating process, after which the surface or surfaces may again be lapped. If it is desired that the conductors project out of the surface, the plating steps may be continued to build up the contacts to a desired height.
Abstract:
Apparatus for use with an engine having an electronic fuel injection (EFI) system, and which apparatus governs engine speed to a predetermined set point. Engine speed is sensed and regulates the fuel supply to the engine whereupon fuel pressure is used as an actuating force to remove engine throttle commands from the control of the operator when the engine speed reaches the set point.