Abstract: A compact, spring actuated, counterbalance system (10) for relatively large, inwardly opening aircraft bulk cargo doors (11) and similar closures of the type adapted to be pivoted about a horizontal hinge axis (12) oriented along the upper edge of the door (11) which is of the type commonly shifted through angles on the order of about 50.degree. between fully closed and fully opened positions and employing: (i) an overhead conventional type compression spring assembly (15) including a housing (20), a spring actuator (21) movable axially through the housing (20), and an axially compressible spring assembly (19.sub.a -19.sub.d) bottomed at one end on the housing (20) and at its opposite end on the spring actuator (21); (ii) a bell crank assembly (16) having a bell crank (24) pivotally mounted on the overhead aircraft structural frame (18) and having a pair of angularly related crank arms (24.sub.a, 24.sub.

Abstract: Methods of and apparatus for removing contaminants from heated gases by impact separation. The contaminants are collected by adhering them to a moving surface, and they are thereafter removed from that surface.

Abstract: A subscriber power supply which delivers sufficient power to a subscriber terminal load despite variations in load current due to changes in the number of channels in a telephone carrier system. The power supply also has a back-up unit which operates to deliver power to the load in the event that a fault occurs in the primary supply.

Abstract: Hydrostatic test apparatus for pressure testing fire hoses, pressure vessels such as fire extinguishers, or the like, including a small, portable unit having an inlet line for connection to a hose from an ordinary water tap, for example, an outlet line connected to the item to be tested, a pump, a first bypass line between the inlet lines for filling the item being tested, a control valve in the first bypass line which is closed during testing to prevent backflow of test pressure into the water supply, a pressure gauge in the outlet line for reading test pressure, and an adjustable relief valve in a second bypass line between the inlet and outlet lines for setting a predetermined test pressure. Air vents or bleeds allow the apparatus to be completely bled of air before testing to assure accuracy of the test pressure readings. The apparatus operates on very low water volume for safety.

Abstract: An orthotic appliance adapted to be placed in an article of footwear which includes; a first upper, relatively flexible blank portion and an underlying rigid cap portion. The cap portion has upwardly extending side walls along the side portions of the orthotic. A relatively resilient and flexible pad portion and a moldable insert are positioned intermediate the blank and cap portions. The orthotic being characterized in that the orthotic restrains outward expansion of side portions of the foot while cushioning impact upon initial ground contact, and with the foot terminating ground contact, resiliency of the insert aids departure of the foot from ground contact.

Abstract: A cleaning cassette for cassette recorders in which movement of either spindle of the cassette recorder operates a cleaning element within the cassette casing. Transmission of the rotary movement is achieved by a pair of rotatably mounted reel hubs and a pair of exterior toothed wheels, one integral with each hub, with the reel hubs coupled together by a third intermediate exterior toothed wheel to form a permanent gear train. For driving a cleaning element, such as a felt tab, the intermediate wheel drives a cam and lever. By rotating either toothed wheel, the intermediate wheel causes the lever to move the tab alternately back and forth substantially parallel to the front edge of the cassette casing.

Abstract: An on-board tail jack assembly (20) for stabilizing the tail region (14) of an aircraft (10) during a loading or unloading procedure is comprised of a jack unit (22) disposed within the tail region of the craft in force communication with a frame member thereof for load transfer and distribution upon stabilizing actuation of the jack, which jack includes a reciprocable jack ram member (36) having a distal end terminating in a coupling member (40); and a strut (24) comprising a shaft (80) having a proximal end terminating in a coupling member (114) with a complementary geometric configuration as respects that of the jack unit for mating engagement therewith, which strut further includes a first shaft member (102) and a second shaft member (104) disposed in biased, adjustably displaceable engagement therewith.

Abstract: An apparatus to monitor temperature of the milk taken from a cow. The apparatus comprises a housing that is mounted to a short tube of a milking claw. It has a tilt switch that causes the device to be operational when in an upright position, and non-operational when the short milk tube is depending downwardly in a non-use condition. The heat transfer coefficients of the apparatus are arranged so as to minimize potential errors in temperature measurement due to wide variation in ambient temperature in a milk parlor.

Abstract: A portable sluice box for classification of mineral particulate from detritus or placer deposits containing the same is comprised of an infeed table including upstanding sidewalls and a bottom wall for receiving and confining a charge of mineral-containing deposits for fluid compelled movement along a path lying in a material handling plane generally coincident with the bottom wall of the table; a classification table member, including upstanding sidewalls and a foraminous separation plate having downwardly depending, opposed marginal skirts for proximal engagement with the sidewalls of the separation table interiorly thereof, the separation plate also lying within the material handling plane; a plurality of riffles disposed transversely in a laterally and longitudinally extending spaced array between the skirts, defining a series of upper flow channels intermediate the separation plate and the top edge of the riffles and a lower, mat channel intermediate the bottom wall of the classification table and the bo

Abstract: A sweep linearization network for an FM/CW radar system, wherein the transmitter sweep rate is subject to variation as a function of range, is comprised of a sweep slope circuit for establishing a desired sweep rate for the interrogation signal of the radar transmitter; an accumulator/memory having stored therein a plurality of sweep slope coefficients corresponding to N discrete sweep segments of an individual sweep of the interrogation signal; a driver for developing a ramp signal controlling the sweep of the interrogation signal, which receives the sweep slope signal and, sequentially, the sweep slope coefficients for adjusting the ramp signal over each of the N sweep segments; a transmitter sampling circuit for developing a transmitter characteristic signal proportional to and indicative of the interrogation signal; a discriminator for dividing the transmitter characteristic signal into a plurality of equal frequency excursion time periods based upon a preselected amplitude thereof to develop a measured t

Abstract: A truck and trailer assembly adapted to travel over the road in a traveling mode, where the trailer is spaced a substantial distance from the truck, and also adapted to operate in a maneuvering mode where the trailer is more closely coupled to the truck, and the front steerable wheels of the trailer are raised out of ground engagement. In the various embodiments, this is accomplished by rotating the reach of the trailer relative to the trailer, so as to lift the forward wheels of the trailer from the ground. The reach is conveniently shortened by providing the reach as three telescoping members.

Abstract: A counterbalancing system (30) for an inwardly/outwardly moving door (20) pivotable about an inclined hinge axis between fully closed and fully opened positions wherein the door (20) moves: (i) upslope through angle .beta. and downslope through angle .theta. as it opens; and (ii), upslope through angle .theta. and downslope through angle .beta. as it closes. The door (20) is hinged to a torque tube assembly (25) coincident with the hinge axis; a radial cam (38) having a profiled cam face (36) is mounted on the torque tube assembly (25) for rotation through the angles .beta. and .theta.; and, springs (31, 32) are mounted within a housing (34) having a reciprocable piston (44) and a cam follower (35) carried thereby for biasing the follower (35) into engagement with the cam face (36). As door (20) moves downwardly through angles .beta. and .theta., the springs (31, 32) are compressed and energy is stored therein. As door (20) is manually shifted upslope through angles .beta. and .theta.

Abstract: Aqueous chemical milling solutions for aluminum and aluminum alloys. These solutions contain a caustic; a nitrate or nitrite; and, optionally, a diol or polyol such as ethylene glycol or glycerin. Chemical milling processes which employ such solutions.

Abstract: Methods of and systems for preventing air pollution in the handling and storing of particulate solids out-of-doors in bulk form; i.e., in a pile. A windfoil arrangement keeps material from being entrained in wind blowing over the pile and thereby causing an air pollution problem. The problem is particularly acute when material is being dumped; it also arises when wind strips the particulate material from the pile, and it can result in the particulate material being scattered over a widespread area (typically one mile or more in radius) which indicates that the air pollution is not restricted to the immediate vicinity of the area in which the material is stored.

Abstract: A serial cross-correlator having a pair of input ports (L and R). One of these ports (L) is connected to a first band-pass filter network (63) which is in turn connected to a digital Hilbert transformer (60). The other of the input ports (R) is connected to a second band-pass filter network (64) which is in turn connected to fixed delay (65). The output of the Hilbert transformer is connected to one input of a multiplier (66) while the output of the fixed delay is connected to the other input of the multiplier; and a low pass filter network (67) is connected to the output of the multiplier. The Hilbert transformer produces a 90.degree.

Abstract: An audio amplifier operatively connected to the secondary winding of a power transformer. The primary winding of the transformer is connected through a control circuit which has switch means that is turned on and off during selected portions of half cycles of the voltage imposed upon the primary winding of the transformer. By turning the switch on and off at appropriate intervals, the proper amounts of electrical energy can be delivered to supply the power requirements for amplification, while substantially reducing problems of idling currents in the primary winding of the transformer. Thus, the transformer can be made much smaller than in power supplies of conventional amplifiers.

Abstract: A visible file pocket (100) having a laminar central web (101) and front and back, lower and upper pocket tips (102-105) for receiving the lower and upper edges of documents to be supported thereon and wherein the upper edge (108) of the file pocket (100) is provided with a transversely extending hinge pin receiving bore (109) adapted to receive a hinge pin (110) and laterally projecting hinge elements (112).

Abstract: A capacitance measuring circuit board test system (10, 10') for measuring the electrical continuity and integrity of line segments (14) on a circuit board (12) including: a test stand support (20); a conductive pliant circuit board backside reference plane (19, 29, 34) carried by the support (20); means for pressing the circuit board (12) into intimate mutually coextensive face-to-face contact with the conductive pliant material (29) defining the reference plane (19, 29, 34) with the interface therebetween being devoid of air gaps; and, a capacitance measuring device (16, 40) having sensory terminals (5, 18 and 44, 45) respectively coupled to a relatively movable test probe (11, 46) and to the backside reference plane (19, 29, 34) for measuring the capacitance of the circuit board line segments (14) between n test points and the backside reference plane (19, 29, 34).

Abstract: An ultrasonic transducer having a transducer head, for insonifying an organ or part thereof in a human patient from a position within the suprasternal notch thereof, wherein the transducer head is in at least a partially obscured disposition within the notch vis-a-vis the operator thereof during insonification, is comprised of an elongate handle member with a proximal and a distal end, having a non-circular peripheral cross-sectional geometry including at least one longitudinal edge to yield a gripping surface providing the operator with the ability to manipulate the probe via tactile sensing of its position and a transducer head extending from the distal end of, and generally normal to, the handle, wherein the head has a generally arcuate cross-sectional geometry and a generally trapezoidal profile to enhance patient comfort during operator manipulation of the probe.