Abstract: A fluid pressure-activated warning system for a crane comprising a plurality of signal device actuators each further comprising a valve spool, shiftable in response to a dangerous condition, and adapted to permit the emission of an alarm on the occurrance of such dangerous condition.

Abstract: In order to provide a magnetic tape recorder where the magnetic tape and tape reels are driven by a drive belt with the capability of operating in temperature extremes, the drive belt is composed of silicone rubber that has been cured with a peroxide curing agent.

Abstract: A control linkage for use with a door closer, wherein the linkage is provided with a spring which resiliently biases against relative rotation of a pair of arms as the arms approach a door-open limit position, and which aids the door closer in moving the door from the door-open limit position.

Abstract: An iontophoretic bioelectrode includes an enclosure having a bottom wall formed of a membrane through which ions may migrate when subjected to an electric field, and an upper wall joined to the bottom wall to define an interior compartment for holding an ion-containing solution. An electrode in the form of the male portion of a conventional clothing snap is mounted to the enclosure to communicate electrically with solution contained in the interior compartment. A needle receiving element is mounted in the upper wall of the enclosure. This element is in the form of a section of conduit having a receiving end, which is directed upwardly, and a blocking end which includes a platform for preventing a needle inserted into the receiving end from passing all the way through the conduit. A resilient plug is disposed in the receiving end of the conduit to prevent solution from escaping from the interior compartment.

Abstract: A bioelectrode for use in the iontophoretic delivery of ions into the skin or tissue of a person includes either a receptacle or a composition of material suitable for holding ions to be delivered, a metallic foil disposed on one side of the receptacle or composition of matter, and a coupling device for electrically coupling the foil to an electrical source. The other side of the receptacle or composition of material is for placement against a person's skin or tissue so that ions may be delivered thereinto. The receptacle or composition of material both include features or characteristics which inhibit the migration of ions laterally therein, i.e., in a direction generally parallel to the surface of the skin or tissue, but which allow migration in a direction generally perpendicular to the surface of the skin or tissue, and in particular from the metal foil toward the person's skin or tissue.

Abstract: A size sensing X-ray cassette tray adapted for nesting within an X-ray table or a vertical holder, has a pair of longitudinally spaced opposed front and rear cassette engaging clamps linked together for movement in unison and slidably mounted upon the tray for centering and holding a cassette. A side sensing finger is slidably mounted upon the tray for movement at right angles to the clamp movements. A pair of right angularly related linear potentiometers are mounted upon the tray adjacent one of the clamps and finger, parallel to their direction of movements respectively. Wiper arms are connected to one clamp and finger have contacts slidably engageable with the respective potentiometer for establishing resistances in a circuit with the X-ray equipment proportional to the length and width of the cassette.

Abstract: Apparatus for reducing landing shock for instruments run into earth boreholes through drill string bores and to maintain azimuthal orientation being protected with enclosing structure. An instrument package has a depending spear point for engaging a baffle in the drill string. The spear point encloses a spring and fluid damped shock absorber. The instrument package further includes a second internal fluid damped shock absorber and a spring type rotary shock absorber for the measuring instrument.

Abstract: A digital symbol generator for developing analog deflection voltages to drive a cathode ray tube display forming a plurality of symbols from successive blanked and unblanked vectors rotatable about an arbitrary angle of rotation. Each vector is specified by a binary representation of its polar coordinates including vector angle and length, rotation being accomplished by digital addition of the vector angle and angle of rotation. A line length counter generates a pulse train the number of pulses of which is proportional to vector length and the frequency of which is greater for blanked vectors than for unblanked vectors so that blanked vectors are drawn at a faster rate. Symbol error checking is accomplished by a vector closure technique wherein the symbology end point is measured at the output of the symbol generator and compared with the independently calculated true end point.

Abstract: A reel-to-reel constant speed tape transducer in which the torques of the reel motors are controlled to maintain the tension in the tape to the take-up reel substantially equal to or slightly greater than the tension in the tape from the supply reel. The speed of the take-up reel provides a measure of reel diameter to generate signals which control the torque of the reel motors.

Abstract: A device for insertion into the flow line of a high speed capsule classifying machine, having a capsule receptacle mounted on a movable gate, and a control circuit for detecting nonuniform capsules on the receptacle to position the gate and thereby move the receptacle in front of an air pressure jet to remove the nonuniform capsule from the receptacle, and then reposition the receptacle back into the capsule flow line.

Abstract: A flexure in a force transducer, as an inertial guidance accelerometer, for securing a force sensitive element to a mounting base includes one or more flexure sections having one or more recessed surfaces which are substantially coincident with the neutral bending plane of the flexure. Electrically conductive coating on the recessed surfaces provide electrical connections to components located on the force sensitive element. The conductive coatings on or near the neutral bending plane of the flexure sections minimizes bending moments caused by stresses set up between the conductive coatings and the flexure which may in turn lead to bias errors. At the same time, the flexure configuration provides for the desired strength and spring rate for the force sensitive element.

Abstract: A flexure in a force transducer, as an inertial guidance accelerometer, for securing a force sensitive element to a mounting base includes one or more flexure sections having one or more recessed surfaces which are substantially coincident with the neutral bending plane of the flexure. Electrically conductive coating on the recessed surfaces provide electrical connections to components located on the force sensitive element. The conductive coatings on or near the neutral bending plane of the flexure sections minimizes bending moments caused by stresses set up between the conductive coatings and the flexure which may in turn lead to bias errors. At the same time, the flexure configuration provides for the desired strength and spring rate for the force sensitive element.

Abstract: The invention contemplates an electrically operated valve construction for control of fluid flow wherein an actuator module is adapted for detachable connection to a valve-body module which contains the valve member to be automatically positioned by a driver element of the actuator module. All electronic components for moving the driver element are self-contained in the actuator module, and these elements include a fluid-sensing transducer producing an electrical output, for closure of the control loop. The transducer has sealed exclusive exposure to fluid in the valve-body module via a special port within the confines of the interface between the modules, when the modules are assembled to each other; this port communicates directly with that part of the valve-body passage which is on the downstream side of the valve member.

Abstract: A square root signal extractor generates an output signal which is a square root function of an input signal. First and second diaphragm amplifiers have cascaded output chambers connected to a high gain output amplifier. The first and second amplifiers are connected as the non-inverting input and the inverting input respectively of the operational amplifier. A high gain output diaphragm amplifier is connected to the inverting amplifier output. The output diaphragm amplifier is constructed such that only a low level input pressure change is required to create a full swing of the output pressure. A non-linear input restrictor and a linear feedback resistor are connected to the input chamber of the inverting amplifiers. The feedback resistor has a significantly greater resistance than the input resistor. The non-inverting diaphragm amplifier is connected to the transmitter by a fluid repeater. A reference signal source is connected to the input restrictor and thus to the inverting input.

Abstract: A sensing probe unit includes an electrically nonconductive polymeric layer charged with a permanent electric charge to form an electret and intimately bonded to a compensating metal electrode. In the fabrication, the polymeric layer is cleaned and the metal electrode affixed to one surface by vapor deposition, lamination or baking. The polymeric layer may also be applied by coating the electrode with dielectric particles and then heating the subassembly to fuse the particles into an integral layer and to bond the fused layer to the electrode. The subassembly is thermally destressed and the polymeric layer is thereafter charged by triboelectric charging, corona discharge or electron beam charging, or by liquid contact charging processes. In the latter, a Freon-type or other similar liquid having good wetting properties and high evaporation rate is used as a contact charging liquid which creates a particularly stable electret. The sensing probe is stored to prevent loss of charge and sensitivity.

Abstract: A hydraulic door closer is provided with a fluid seal for its output shaft, the seal comprising multiple O-rings disposed side-by-side in an elongated annular chamber.

Abstract: The necessity for rigorously controlling process variables or making physical measurements is eliminated in a method of manufacturing a flexure for use in connecting a force sensing element to a mounting base in a force transducer where indicator portions are provided in a blank and material is removed uniformly from the blank including indicator portions until the indicator portions disappear. This process can also be used to configure a flexure out of a unitary piece of material such as fused quartz where a blank is masked except for indicator portions on each surface of the blank and at least one other surface portion; material is removed from the non-masked portions of the blank; and after removing the mask, material is removed from the blank until the indicator portions disappear.

Abstract: A recirculating hot oil cooking apparatus for animal or vegetable product pieces which includes flow direction altering mechanisms in front of and behind the product entry zone of the cooker to substantially eliminate eddy currents and improve movement of raw product pieces from the product entry zone toward the product exit zone without product clumping.

Abstract: An optimal start programmer for starting a heating or cooling cycle for an intermittently occupied building includes a digital counter which is enabled at the start of a pre-occupancy "search" period and accumulates counts from a timing source. A digital to analog converter is responsive to the cumulative output count of the counter circuit for generating a staircase or ramp signal which provides a time-variable set point signal during the search period. In the heating mode, the reference signal to the digital to analog converter is a signal representative of the outdoor ambient temperature; and in the cooling mode the reference is a constant signal. The operating mode of the system during the search period is determined by a mode selection circuit which is responsive to a heating mass signal and a cooling mass signal to automatically determine whether the system is to operate in a heating mode, a cooling mode or an inhibit mode in which neither the boilers nor the chillers are actuated.

Abstract: A motorized wheelchair tie-down system has been developed for use in vehicles by wheelchair bound driver or passenger. This system provides for automatic securement of the wheelchair to the vehicle by operation of a switch. The switch powers a motor causing a linkage system to lower a rear bar on the wheelchair into an anchor while a pivoting anchor carries the forward portion of the wheelchair into a locked position.