Abstract: A method of purging a particulate suspension fluid from a fluid system during system shut-down utilizes an unparticulated constituent as the purging fluid. The unparticulated constituent remains in the system during shut-down periods and is subsequently converted to a composite fluid of the type it was previously used to purge.

Abstract: Halogen containing polymers are stabilized against deterioration by novel organotin mercaptoalkanol ester sulfides or polysulfides characterized by having at least one sulfide or polysulfide bridged tin to tin group and at least one oxygen containing organic group bonded to tin through a carbon atom.

Abstract: A housing contains a slidable spool operable to port a first pressurized fluid line to a fluid motor, and a housing reservoir has a float movable with a fluid level. The motor drives a pump which "pumps down" the reservoir. A second pressurized fluid line is directed through a primary fixed orifice and against one end of the spool, acting against a spring bias, and is permitted to exit through an end orifice to the reservoir. The float moves in response to the fluid level and operates to shut off the end orifice flow, thereby building up backpressure to shift the spool, and thus varying outlet flow from the valve in accordance with the reservoir level. Therefore, the reservoir is pumped down in accordance with reservoir build-up.

Abstract: A coupling includes an outer cup-shaped member which acts as a support for other portions of the coupling and which itself is revolvably supported on a conveyor that moves the coupling between workpiece loading and unloading stations. The outer cup-shaped member acts as a shield against ambient conditions which may include heating, coating or other processing means. One embodiment of the invention has a plurality of fingers mounted to move radially inward of the coupling to grasp the workpiece, which fingers are mounted to form a part of the outer shield or wall at the time that they are grasping a workpiece. Another embodiment of the invention involves an internal chuck sort of coupling using an expandable elastomeric member which can expand outwardly into a grasping relationship with a hollow portion of the workpiece. The coupling and conveyor are suited for use in handling soft or easily marked materials such as plastic, soft metals and the like.

Abstract: The position of a receiver responsive to C/A signals derived from multiple, orbiting space crafts is determined to an accuracy of greater than 300 meters. Each of the C/A signals has the same carrier frequency and a different, predetermined Gold code sequence that normally prevents position determination to be more accurate than to within 300 meters. C/A signals transmitted to the receiver are separately detected by cross correlating received Gold code sequences with plural locally derived Gold code sequences. Four of the detected C/A signals are combined to compute receiver position to an accuracy of 300 meters. To determine receiver position to greater accuracy than 300 meters, the relative phase of internally derived Gold code sequences is varied over the interval of one chip of each sequence, to derive second cross correlation values indicative of received and locally derived Gold code sequences; the second cross correlation values represent different positions within the computed 300 meter position.

Abstract: Grinding machine having annular dressing wheel whose inner surface is used for dressing.

Abstract: A high Q load circuit is automatically matched to a drive circuit with an L network having a series reactance and a shunt reactance, one of which is on a load circuit side of the network and the other of which is on a drive circuit side of the network. The reactance on the load circuit side is of a type opposite to the reactance of the load, while the drive circuit reactance provides an approximate match between the drive and load circuits. Both reactances are varied until the voltage or current magnitude applied by the drive circuit to the network is at least equal to the voltage or current magnitude of the reactance on the input side. Then the reactances are varied until the voltage or current magnitude of the reactance on the input side is slightly less, by a predetermined amount, than the voltage or current of the reactance on the output side. For each unit change of the reactive value of the reactance on the load side, there is a small change in the reactive value of the reactance on the drive side.

Abstract: A centerless grinder is adapted to have a regulating wheel feed towards a grinding wheel about a pivot point to accomplish an infeed grind operation on a plurality of parts between the wheels. The parts are infeed ground at a plurality of stations from an inlet end of the wheels to an outlet end of the wheels, and the pivot point is proximate the outlet end, thereby achieving variable feed distances and variable feed rates along the face of the regulating wheel relative to the grinding wheel, from the inlet end to the outlet end. After an infeed grind operation, the plurality of parts are advanced to their next adjacent stations for a subsequent grind operation. By the arrangement disclosed, coarse-feed grinding is performed on one workpiece while fine feed grinding is performed on another piece and varying degrees of rates of grinding are performed on the intermediate pieces during the same time interval.

Abstract: A method and apparatus are disclosed for precision placement of a workpiece onto a transport member. A plurality of workpieces are aligned in a predetermined spacial relationship upon an infeed conveyor. The workpieces are then moved transversely off the conveyor and dropped through a pair of counter-rotating lubricating rollers. An arcuate chute directs the workpieces from the lubricating rollers to a horizontally disposed planar surface where they are realigned by a cooperating scraper positioned intimately above. Relative movement between the scraper and the planar surface causes the workpieces to be discharged from the surface and precisely deposited upon the transport member.

Abstract: An injection molding machine base has a generally rectangular form having as an integral part thereof a hydraulic return line formed within the base. The return line is straight, has clean-out openings at each end, and no obstructions therein whereby removal of closures at each end exposes the entire cross-section for cleaning. Hydraulic equipment on the machine exhausts directly into this maze. One end of the base has a connection to the hydraulic reservoir for the machine.

Abstract: A nozzle shut-off valve for placing between the injection apparatus and the mold cavity uses two pins of different lengths for the valve elements and switches air pressure back and forth between pistons on opposite (outer) ends of the pins. The pistons have no fixed connection to the pins. Each pin is actuated either by force from the piston on its outer end or pressure by the plastic melt on its innermost other end. The longer pin has a length sufficient to extend completely across the injection passage and block it to prevent any flow. The shorter pin is deliberately made short enough that it cannot block the passage. The valve is actuated by air pressure on the two pistons in timed relation to injection molding events. Pressure on the piston engaging the longer pin compels blocking of the injection passage during plastication. Switching of pressure to the other pin during injection permits the pressure of molten plastic to spread the pins apart whereupon injection proceeds in the ususal manner.

Abstract: Internal grinding machine having wheelhead mounted on an elongated cylindrical bar whose axis extends parallel to but substantially spaced from the axis of the abrasive wheel, the bar being mounted in bearings and the relative movements of the wheelhead for producing a grinding cycle being accomplished by rotation of the bar about its axis and by longitudinal motion of the bar along its axis.

Abstract: A mechanism to transfer small flat workpieces (chips) between locations has a pair of interlinked four bar mechanisms one of which mechanisms carries a chip spreading means operated by two cams so that the chip pickup and release means moves in substantially vertical and horizontal timed relation to pickup a number of chips, move through a shallow horizontal arc, simultaneously spread the chips further apart, drop the chip; and repeat. Mechanism is disclosed for moving a plurality of chips of biaxially orientable polystyrene between a heating means and a forming means while laterally increasing the spacing between the chips.

Abstract: On a machine having a cutting tool moving relative to a rotating workpiece, a method and apparatus are disclosed for holding a constant relationship between the cutting tool and an angular position of the workpiece for different velocities of the cutting tool which produce correspondingly different following errors. The invention is applicable to a numerically controlled turning machine of the type maintaining a constant initial contact point between the cutting tool and an angular position of a rotating workpiece in response to a constant following error during successive machining passes. A first machining pass is executed in response to a first velocity signal which causes the cutting tool to initially contact the rotating workpiece at a first angular position thereof. Before the execution of a subsequent machining pass, the velocity signals associated with the first and subsequent machining passes are used to calculate the difference in following errors between machining passes.

Abstract: A machine has a rotatable spindle adapted to carry a work-contacting wheel which is end-wise supported between a spindle flange and a clamping flange. A flat circular plate and belleville spring disc are disposed between a side of the wheel and the spindle flange, and the belleville spring disc is compressed to such loaded position that minor changes in its loaded height will not substantially affect the spring load, and thereby minor changes in the spindle length and/or wheel width may be accommodated without appreciably affecting the clamping forces on the grinding wheel.

Abstract: A wheel dresser unit has a housing with an internal fluid chamber, and a diamond dresser nib is mounted to the housing in thermal communication with the chamber. A thermally conductive fluid flows through a plurality of ports within the housing in thermal communication with the dresser nib, thus conducting heat from the dressing zone through the dresser nib and to the thermally conductive fluid, tending to cool the dresser nib.

Abstract: Liquid reaction molding (LRM) shot size and ratio control is achieved using a programmable controller (microprocessor) to select on a first-come-first-served basis one mold from among several and to manipulate a plunger metering pump system by retracting each of a pair of pump plungers to the same position each time the system is reset and to decompress or reduce pressures after injection. Each and every shot is started from this uniform reset position. Later steps in the sequence are: taking the hydraulic slack out of each pump system by prepressurizing which is done by advancing each plunger from said position independently until each and all liquid systems reach a threshold pressure (which pressure may differ from one liquid system to the other), feeding the shot size or quantity of each liquid (i.e.

Abstract: A unitary hanger is provided for supporting from the lower web of a single, overhead I-beam support the trolley rail, the advancing reach, and one or more returning reaches of a drop finger conveyor.

Abstract: A coupling includes an outer cup-shaped member which acts as a support for other portions of the coupling and which itself is revolvably supported on a conveyor that moves the coupling between workpiece loading and unloading stations. The outer cup-shaped member acts as a shield against ambient conditions which may include heating, coating or other processing means. One embodiment of the invention has a plurality of fingers mounted to move radially inward of the coupling to grasp the workpiece, which fingers are mounted to form a part of the outer shield or wall at the time that they are grasping a workpiece. Another embodiment of the invention involves an internal chuck sort of coupling using an expandable resilient member which can be an elastomeric ring to expand outwardly into a grasping relationship with a hollow portion of the workpiece. The coupling and conveyor are suited for use in handling soft or easily marked materials such as plastic, soft metals and the like.

Abstract: A hydraulic cylinder with heads on each end of a cylinder body utilizes a tie rod of hexagonal cross section to positively prevent relative rotation with an attached magnetic switch. The switch is engaged along the tie rod about a section in which the diametral dimension is at a relative minimum and has mated flattened portions which cooperate with flattened surfaces on the tie rod.