Abstract:
A switch comprises a first and second contacts, a plunger, a toggle bar, and a spanner. A preferred trip lever arrangement is used in which a trip lever transfers an actuating force from the plunger to the toggle bar, and the toggle bar is caused to move farther than the plunger to provide a short trip point. Swing arms that are acted upon through a series of rigid body force transfers allow an operator to manually force welded contacts to be broken in the event that the contacts become welded to a spanner or other components of the switch assembly.
Abstract:
A variable spot size x-ray tube comprises a cathode having an electron emitting surface providing an electron beam that travels essentially along the tube axis of symmetry to an anode. The anode, spaced from the cathode, includes a target, the front surface of which is disposed at an oblique angle with respect to the axis of symmetry. The potential of the anode is generally positive with respect to that of the cathode. The cathode is heated to a temperature at which electrons are emitted by the thermionic emission process. Current from the cathode can be controlled by varying the cathode temperature if the cathode is operated in the temperature limited region. The incident electron beam forms a spot on the target surface whereupon x-rays are produced in response to impingement of the electron beam on the target. The x-rays propagate outwardly from the target spot through a vacuum window to form a beam of x-radiation outside the x-ray tube. An aperture grid is disposed between the cathode and the anode, and has a central aperture permitting the electron beam to pass therethrough. The aperture grid further has a variable voltage applied to it which may be positive, negative, or equal to the potential of the cathode. The voltage on the control grid is used to control the diameter of the electron beam which impinges upon the target. Specifically, the electron beam diameter varies in correspondence with the variable aperture grid voltage, and selective variation of the electron beam diameter results in a corresponding variation in size of the x-ray imaging spot.
Abstract:
The concentration of a constituent gas in a product gas delivered by a molecular sieve type gas separation system 10 is controlled by a flueric partial pressure sensor 15 connected to a spill-valve 16 which is conduitly connected to a product gas delivery duct 13. The flueric partial pressure sensor 15 compares a reference bleed of supply gas with a sample bleed of product gas and outputs signals to control the spill-valve in spilling product gas from the delivery duct 13 so that the rate of flow of gas through adsorption beds 11 of the system 10 is controlled to provide product gas having a required concentration of the constituent gas.
Abstract:
A device and method for the measurement of the thickness of a wet coating, such as paint, on a substrate, the device comprising a frame with two legs having ends which may be pressed through the wet coating onto the substrate. A probe is mounted in the frame and is adjustable towards and away from the frame. An indicating scale is provided to show the position of the probe. The probe has a transparent or translucent tip so that the point at which contact is made with the wet coating may be observed. The method employs a calibration step by setting the device on an uncoated surface of the same shape as the coated surface, thereby avoiding errors due to wear of the device and curvature of the surface.
Abstract:
The C-fold mailer includes first, second and third panels foldable about transversely extending foldlines to form a mailer with return envelope. Adhesive is applied to one face of the sheet along opposite side margins. The second and third panels are folded and adhesively secured along three margins and the first panel is adhesively secured along the outside face of the third panel. By arranging the lines of adhesive relative to perforated lines along the sides and one end of the mailer, registering sides and end portions of the mailer may be removed while retaining the return envelope adhesively secured along three sides. An integral flap is provided whereby a portion of the first panel may be used as a remittance slip. The slip may be inserted into the return envelope, and the flap folded to seal the return envelope.
Abstract:
A rheometer for measuring viscoelasticity with a complex rigidity function comprises a tube for holding the fluid, means for oscillating the tube in the direction of its axis, detector means for detecting the position of the sample of fluid, and an analyzer for relating the movement of the fluid sample to the movement of the drive to derive viscosity characteristics.
Abstract:
A hearing aid is permanently adjusted to match prescribed amplification characteristics at predetermined frequencies. A single channel filter (24) includes three identical filter stages (60, 62, and 64) that are optionally cascaded in series. Each of the filter stages (60, 62, and 64) exhibits a frequency response curve having a first corner frequency (36) below which the magnitude of the response curve approaches a predetermined minimum value, a second corner frequency (38) above which the magnitude of the response curve approaches a maximum value, and a predetermined gain in magnitude between the minimum and maximum values.
Abstract:
A signal processing circuit is incorporated into an audio reproducing device for suppressing noise while preserving distinctive features of speech. A noise detecting circuit includes a low pass filtering circuit (12) and a level detector (14). An output signal (C) from the detecting circuit controls a variable high pass filtering circuit (20) to attenuate a range of low frequencies of an input signal (A) proportional to the detected level of noise. The variable high pass filtering circuit exhibits a family of variable response curves (22, 24, and 26) that vary in slope below a common cut-off frequency (28) that is below a range of frequencies that convey a majority of second formant transitions between consonants and vowels.
Abstract:
In supplying a high volume flow of oxygen-enriched air from a molecular sieve type gas separation system, two sets of molecular sieve beds are coupled in parallel. The beds and of each bed set are cyclically subjected to a charge/adsorption on-stream phase followed by a purge/desorption regeneration phase and are controlled to operate in overlapping sequence with respect to each other. At the same time the corresponding beds are controlled to operate in antiphase relationship to each other.