Abstract: In an EDM process, a method and apparatus are disclosed for determining the quality of a machining gap by detecting a voltage signal across the gap in response to a low power pulse applied immediately prior to a machining pulse. Upon detecting a first predetermined number of consecutive inferior gap voltage signals in response to corresponding low power pulses the application of low power pulses and machining pulses is terminated for a predetermined period of time. Thereafter, only the low power pulses are applied to the machining gap; and after detecting a second predetermined number of consecutive good gap voltage signals in response to corresponding low power pulses, the machining pulses are reapplied.

Abstract: A system for automatically supplying information to an operator, such as a student being taught to repair a piece of equipment, includes a magnetic tape storage medium having audio and video information storage tracks. A coded data signal track having indicia for locations of the information on the video and audio tracks is provided. An operator station includes keys for entering answer and command signals that control movement of the tape, so that the tape is advanced at a normal speed whereby the audio and video information is presented to the operator at a normal rate, the medium is advanced at a high speed to minimize the time that no meaningful information is presented to the operator, the medium is reversed at high speed, or stopped. Indexing of the tape can be performed by the operator selecting predetermined location indicia or in response to the operator selecting certain commands or answers in response to the audio and video information presented to the operator.

Abstract: A vitreous bonded cubic boron nitride grinding wheel is provided which optionally contains silicon carbide or other abrasive having a coefficient of thermal expansion substantially the same as the coefficient of thermal expansion of cubic boron nitride, and wherein the vitreous bond, having a coefficient of thermal expansion substantially the same as the coefficient of thermal expansion of cubic boron nitride, is substantially non-reactive with cubic boron nitride and the optional abrasive.

Abstract: Method for the controlled mixing of liquids in a predetermined ratio and is especially suitable for the dispensing of predetermined ratios of polyol and polyisocyanate liquids in the liquid injection molding of polyurethane articles. The ratio control is achieved by a master-slave relationship between at least two metering pumps of the plunger or piston type which are position coupled and inject on a common programmed velocity profile (in the master system), but with each system controlled by an automatic velocity feedback control loop (a closed loop system) wherein the reference signal into the slave automatic control system (typically the polyol system) is obtained in a suitable ratio from the master automatic control system (typically the polyisocyanate system). The method includes continuing to drive the metering pumps past the time that mixing is cut off.

Abstract: Compositions effective for protecting the skin from dermatologic irritation are formed by incorporating a protective agent which is an organic compound containing two or more polar groups, e.g. carboxyl groups, which are separated by at least 15 atoms the majority of which are carbon atoms and preferably containing a cyclic moiety of at least 5 atoms, e.g. the dimer of linoleic acid, in a pharmaceutically acceptable base.

Abstract: An apparatus for sensing sufficient chucking stock in a rotating work-holding chuck having a self-contained circular plate assembly adapted to the face of the work-holding chuck, wherein a clearance bore is provided through the plate assembly to permit passage of machining stock and a radially movable indicator pin is provided within the plate assembly to detect the presence of machining stock within the clearance bore. The radially movable indicator pin will urge a trip plunger out of the circumferential surface of the plate assembly when no stock is present, and a limit switch will be tripped by the trip plunger to signal the absence of chucking stock.

Abstract: This invention relates to a machine tool which utilizes individual tool modules of a uniform size which can be attached to and operated by a spindle wherein a tool module is provided having the capability of boring holes which are larger than the module itself yet the module assumes a uniform size with other like modules for storage.

Abstract: A clamp for holding together the portions of a mold used in molding solid objects from a reacting liquid such as polyurethane has a C-shaped frame which is pivotally mounted on a pedestal to swing through an arc. The C-shaped frame of the clamp consists of an integral structure having an upper jaw connected by a column to a lower jaw. The frame supports a bed, crown and platen. The bed and crown are each a plate-like member that is mounted to pivot relative to one of the jaws. The platen is mounted preferably on the bed or lower one of such members. The mold portions are mounted on the crown and platen with the parts being arranged to move so that the mold portion engage and disengage. The invention also includes a method of molding wherein the mold portions are engaged and disengaged by a process that involves pivoting at least one and preferably both of the portions relative to the C-shaped frame.

Abstract: Organotin compounds are prepared having (1) at least two tin atoms linked by a bridge through sulfur, carboxylate or both and containing at least two carbon atoms in the bridge, (2) directly attached to the tin atoms one to two alkyl groups containing one to eight carbon atoms and (3) a mercaptoalkanol or derivative thereof. The compounds are useful to stabilize halogen containing vinyl and vinylidene polymers, e.g. polyvinyl chloride.

Abstract: This invention relates to a grinding machine, and more particularly, to a machine for forming annular surfaces of revolution of irregular form.

Abstract: An optical scanner having a narrow instantaneous field of view optically scans an entire field of view to determine if a particular source of optical radiation is in the field of view. A first detector responds to energy of a source imaged by the scanner and derives a first signal having an amplitude versus time variation that is a convolution of dispersed spectral energy from the source. A second detector, displaced by a predetermined distance from the first detector, responds to substantially only one predetermined wavelength of the energy of the imaged source. In response to the energy from the second detector being above a predetermined amplitude, a waveform recognition network responsive to the first signal is enabled. The recognition network includes a circuit for detecting the amplitude of the peak value of an initial undulation of the first signal.

Abstract: The following reactions are carried out in the presence of aprotic solvents as catalysts: ##EQU1## WHERE R, R.sub.2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6 are alkyl, cycloalkyl, alkenyl, aryl or aralkyl, R.sub.1 is ##EQU2## allyl, methallyl or benzyl, R.sub.7 is alkyl, cycloalkyl, alkenyl or aralkyl, R.sub.12 is alkyl or alkenyl, X is chlorine or bromine and n is 1 or 2. The aprotic solvents are ##EQU3## WHERE R.sub.8 is H or CH.sub.3 and R.sub.9 and R.sub.10 are CH3 or C.sub.2 H.sub.5.

Abstract: The test load includes a T-type resistive attenuator, the elements being variable in unison, cascaded with switch-selected series or parallel adjustable or variable reactive elements. The combination permits setting noninteractively and independently the magnitude and the angle of the voltage reflection coefficient.

Abstract: A portable sectional basketball floor that is quickly and easily assembled and disassembled. The floor comprises a plurality of interfitting panels. Certain panels on the periphery of the floor are rigidly secured together by bolted connections located below the playing surface. The internal panels are connected together by subsurface connections comprising overlying brackets with a vertical hole through each bracket. As the floor is assembled, the cooperating brackets on adjacent panels are slid over one another until the openings in the brackets are aligned. A pin is dropped into each pair of aligned holes from above to lock the floor panels together. When the sectional floor is removed, the pins are quickly and easily disengaged by simply lifting them with a magnet, thereby freeing the panels from one another.

Abstract: A fluid clarification device of the type which includes a cylindrical, flat-bottomed separator tank is provided with an elongate sludge collecting trough in the bottom of the tank having an upper portion in open communication with the interior thereof. A conveyor is disposed in the collecting trough for horizontally transporting sludge accumulated therein to a vertically disposed sludge elevator-conveyor in which the sludge is elevated to a discharge port above the fluid level of the separator tank whereby the discharged sludge will be substantially free of excess fluid.

Abstract: A pulley whose outer surface is in the form of three tapered portions selected for use with a flat belt.

Abstract: An interchange arm to transfer tools between a tool storage mechanism and a spindle. A pair of the interchange arms are pivoted on rotating shafts of a tool changer mechanism which rotates the arms between the spindle and the tool storage mechanism so that the arms can securely hold and positively locate the tools which are interchanged during the interchange time, and the tool gripping member and locating members are automatically retracted from the tools when the tools are deposited in their respective holding receptacles. A unique gripping arrangement releasably connects the tools to the arm, using a minimal amount of space for getting on and off the tool, and the tool gripping finger mechanisms are self-locking about the tool under the influence of centrifugal force acting on the tool during the interchange interval, to assure a more positive grip on the tool.

Abstract: Compositions effective for protecting the skin from dermatologic irritation are formed by incorporating a protective agent which is an organic compound containing two or more polar groups, e.g. carboxyl groups, which are separated by at least 15 atoms the majority of which are carbon atoms and preferably containing a cyclic moiety of at least 5 atoms, e.g. the dimer of linoleic acid, in a pharmaceutically acceptable base.

Abstract: A base member has an exterior peripheral surface and has an interior chamber. An elastomeric band is stretched to fit over a portion of the peripheral surface and a portion of the band is allowed to extend beyond the peripheral surface of the base member so that the extension of the band is unrestrained and it thereby tends to reassume its relaxed position and while doing so, it forms a stable curl, or bight, about the edge of the peripheral surface. A plate is carried by a member which is relatively movable with respect to the base member, and the plate bears on the bight of the elastomeric band so as to form a sealed chamber within the base member while the plate is both rotated and moved toward and away from the base member; the bight of the elastomeric band being compliant to the movable plate, and tending to return to its stable position.

Abstract: The degree of skin irritation of detergent compositions is reduced by adding to the detergent compositions small amounts of a hydroxyl derivative of a polymerized fatty acid or a hydroxyl derivative of a hydrogenated (saturated) polymerized fatty acid, e.g. the hydroxy derivative of dimer acid. .Iadd.