Abstract: A control system for a laundry machine generates a control signal to operate a door lock unit and prevent the door from opening while the laundry machine cylinder is rotating. A permanent magnet is mounted adjacent to the drive wheel of the cylinder so that the wheel spokes cut through the magnetic field of the magnet. A pick-up coil is mounted coaxial with the magnet and generates an induced pulse signal as the wheel turns. The induced pulse signal is processed by circuitry mounted on a printed circuit board to generate a DC control signal for the door unlocking circuitry of the door lock unit. The pulse signal is rectified and smoothed to provide a DC signal and is processed by a timer circuit to provide an amplified, precise switching signal which is used as the control signal. The DC control signal operates an electronic switch which connects an AC power source across a relay coil to open the door unlocking circuit so that the door remains locked as long as the DC control signal is generated.

Abstract: Method for the electrolytic separation of colloidally suspended material from a fluid system and compositions for using such method to recover such materials.

Abstract: A pressure responsive diaphragm has on its periphery axially spaced annular projections to define a peripheral annular groove therebetween which receives an annular projection at the coupling surface of a coupling flange. The diaphragm is thus releasably retained on the coupling flange and encloses a recess formed in the flange which recess communicates with the instrument. A compressible sealing ring for the recess within the flange is positioned on the peripheral surface of an annular projection of the diaphragm. The diaphragm may also be provided with an axially extending annular projection which is received in a corresponding axially opening groove formed in the coupling flange. A compressible sealing O-ring may be positioned within this axially opening groove radially outwardly of the diaphragm projection or may be positioned on the peripheral edge of the second annular projection of the diaphragm and arranged so that the O-ring contacts two or three metal walls of the coupling flange.

Abstract: A wet pick-up type vacuum motor fan unit with a separately ventilated motor section and a motor end bracket serving also as a support for, and part of a discharge end housing wall for, the working air fan section, has on the bracket fanward face a centrally apertured metal disk plate defining a flow space or path for bearing sealing air flow from ambient air inlets external of the motor section to a central discharge into the inlet eye of an auxiliary fan clamped on the shaft back-to-back with a larger diameter working air centrifugal fan adjacent the end bracket.

Abstract: A protection device for use on machines which are hand-fed, for protecting the machine operator from accidentally and inadvertently moving his hands inwardly into the entrance opening of the machine for precluding the possibility of injury to the hands or arms. The device provides a plurality of safety devices connected to an electric circuit which feeds the operating motor and the operation of any one of these safety features will stop the machine.

Abstract: An electrolytic filter, consisting of perforated conductive electrodes isolated by a separator, is adapted to filter at the first electrode or cathode suspended materials, including colloidal metal particles such a silver or gold made colloidal by borohydride, zinc, iron, etc., reduction or sulfide, etc., precipitation of metallic ion-containing solutions. The method of recovery involves use of the electrolytic filter and a composition including the finely divided metal containing waste solution in combination with floc forming compounds such as alkaline earth metal hydroxide, and negative charge imparting additives such as soluble phosphates and anionic resin flocculating agents. Preferably, the filter includes a floc circulating chamber in which the incoming liquid assumes a vertical toroidal flow pattern.

Abstract: A solar heat collector including a panel having a coating of PbO.sub.2 electrodeposited from a tartrate bath and a second coating of oxygen-deficient PbO.sub.2, such as .alpha.-PbO.sub.2 or .beta.-PbO.sub.2, heat being absorbable thereby and transferable to a liquid or gas for operating heating or cooling system.

Abstract: A self-contained toilet and waste treatment system comprises a toilet, a water flushing means, a waste treatment chamber including a comminuted redwood filter bed and digestion medium and a final filter, which treats the liquid effluent from the redwood filter and digestion medium, consisting of first and second porous sheet electrically conductive, generally metallic, elements spaced apart from one another and separated by a gas bubble impervious porous material. This filter also includes a means of imposing an electrical potential to establish an electrolytic current between the metallic elements. The first of the porous metallic elements through which the effluent passes acts as a filter member. A negative charge is established there and gaseous hydrogen is evolved, at a pressure on the order of 100 PSI. The evolving hydrogen gas bubbles displace semi-solid material from the metallic filtered element.

Abstract: An apparatus having a rotatable member is provided with a locking bolt slidably mounted on an access cover pivotally mounted on a housing supporting the rotatable member. The locking bolt is axially displaceable toward a latching mechanism mounted on the housing. The latching mechanism has a latch for securing the bolt in a locked position and a limit switch engageable by a key on the bolt for energizing and de-energizing the power to the rotatable member. An air or fluid operated solenoid means is provided to release the latch but is not actuable when the rotatable member is rotating. A rotary speed sensor is provided to sense the rotary speed of the rotatable member so as to enable the air solenoid to be released when the speed of he rotatable member is zero.

Abstract: A retriever reel for electrical or fluid lines in which a continuous connection is made between stationary and moving ends of the line by means of a random-lay spiral of line housed in the core of a rotatable drum and adapted to close in toward the central axis as the movable end of the line is uncoiled.

Abstract: An indicator gauge has a flat light conducting prism with an upper beveled surface positioned between the translucent dial and movement of the indicator. The prism receives light from a source located in the rear portion of the gauge and laterally of said movement, such that light is reflected downwardly by the beveled edge through the prism to illuminate the dial and pointer. A second annular prism may also be provided with a beveled surface so as to reflect light from the source across the face of the dial.

Abstract: An apparatus for monitoring the thickness of filter cake on a filter by using the difference in pressure between the inside of the filter apparatus and the inside of a hollow body spaced from a filter element to provide a signal of measurement.

Abstract: A Bourdon tube sensing element for a fluid-filled temperature gauge is made by inserting strips of silicone rubber into a partially flattened tube, especially one of beryllium copper, which is shaped on a fixture or mandrel. The shaped tube is subjected to a heat treatment during which the silicone rubber expands and deforms the tube. After heat treatment, the tube is cooled retaining its shape and the silicone rubber contracts from the inner surface of the tube to form a small passage between the silicone rubber and the tube so that the pressure of the fluid may be uniformly applied to the interior walls of the tube.

Abstract: A valve arrangement having a disc which is tapered in cross section from the center to the periphery so that upon impact closure with the seat, deformation of the disc will absorb impact energy. The valve arrangement can consist of two check valves in back-to-back relation, the valve discs being swingable relative to the seats therefor, one of the valves being held in an open position and released upon abnormal conditions so that it can close.

Abstract: A vertical centrifugal is provided with an imperforate basket and a center feedcone which discharges the feed stream at the bottom of the basket through a plurality of discharge tubes extending radially from the lower portion of the feedcone. Within the feedcone are provided a plurality of substantially vertically extended vanes for accelerating the liquid feed stream.

Abstract: A pressure leaf filter with a pair of sluicing assemblies oscillatable independently of each other to spray sluicing fluid on said leaf elements to remove filter cake. The sluice arms can have fixed or rotatable nozzles. A control means is provided to energize electric or fluid operated motors at predetermined times so that the sprays of the nozzles do not interfere with each other.

Abstract: A solar heat collector including a panel coated with oxygen-deficient PbO.sub.2, such as .alpha.-PbO.sub.2 or .beta.-PbO.sub.2, heat being absorbable thereby and transferable to a liquid for operation heating or cooling systems.

Abstract: A novel method for the selective electrodeposition of a metallic coating onto a base material and the products produced thereby. In the method of the invention, a thin adherent coating of an electrically conductive material is initially applied to the base material to mask off those portions of the material not to be electroplated. The composite thus formed is then placed in a suitable electroplating apparatus wherein a metallic coating such as gold or other precious metal is electrodeposited onto the portions of the composite not covered by the masking material. After electroplating, the masking material may readily be removed from the base material by chemical or mechanical means, or it may be left intact on the plated article to perform a utilitarian or decorative function in the end product application.

Abstract: In an electric motor fan unit, a motor section frame enclosing a motor ventilating fan moving air through an internal motor cooling air path includes an end bracket with an enlarged rim for mounting fan shell and interior partition structures defining a fan section housing with a chamber for a working air centrifugal impeller mounted on the motor shaft outboard of the end bracket and drawing a working air stream into a housing axial inlet for discharge at the housing circumference, and with an inner chamber for a slinger disk on the shaft to afford bearing protection from working air borne moisture, contaminants, and high temperature and humidity, by simple, low cost, durable structure.