Abstract: A traction increasing chain for vehicular tires that may be installed thereon without moving the tire relative to the surface supporting it. The chain provides plural rigid side elements articulately interconnected and carrying cross-chains, all so configured that when installed on a tire the cross-chains will cover a portion, but not the supported portion, of the peripheral surface of the tire. A medial fastening linkage maintains the chain on the tire during usage.

Abstract: Projections made of a different and less abrasion resistant kind of rubber to that constituting the exterior of the tire are arranged to contact the road during low pressure conditions, whereby the amount of rubber worn off indicates the amount of fatigue accumulated and degree of internal damage done by running the tire at that pressure.

Abstract: A wheel rim assembly comprising a generally cylindrical rim base and a flange ring including a bead seat retained at one axial end of the rim base by a split locking ring. A T-shaped lug on the flange ring captures the ends of the locking ring in a corresponding groove on the rim base and prevents removal of the locking and flange rings when a tire mounted on the wheel rim is inflated. Circumferential grooves on the inside surface of the tire bead seat cooperate with an annular seal in the rim base to prevent inflation of a tire mounted on the wheel rim when the flange ring and bead seat are improperly positioned thereon.

Abstract: The present tire siping machine can rotatably support a wheel mounted and inflated tire with the tread thereof facing a driven and adjustably mounted siping blade and feeler adjustably connected to the siping blade for permitting the feeler and siping blade to engage the tire whereupon the feeler maintains the siping blade in proper relation to the tire tread for said siping blade to cut and move around the tire tread to effect minute lateral cuts or sipes in a section of the tire tread to be followed by repositioning of said blade to other sections of the tread and repetitions of the siping operation until the entire tire tread is siped.

Abstract: The specification discloses a panel system in which panels are joined by one (at an angle) or two (in a straight line) elongated, flexible hinge(s) which is secured to each of the panels to be joined by being clamped between the end of the panel and an end cover which is readily removable from the panel. The end cover and the end of the panel both include flanges which interengage. The flanges on the end of the panel are relatively short so that by sliding the end cover only a short distance vertically, one can either secure it in position or remove it. The end cover includes a top shoulder and the end of the panel includes a bottom shoulder between which the elongated flexible hinge member extends with its top edge generally adjacent or abutting the top shoulder and its bottom edge generally adjacent or abutting the bottom shoulder, such that two adjacent panels joined by the hinge are automatically properly aligned.

Abstract: A dosed amount of molding material is placed in a vessel arranged at a given distance from a pattern device from which a mold is to be formed, and a pressurized force is applied against the molding sand in the vessel from the side thereof remote from the pattern device in order thereby to impart to the molding sand an acceleration in the direction of the pattern device to compress the sand about the pattern device with the velocity of the accelerated molding sand being braked by impact with the pattern device and also by impact partially with a molding box within which the pattern device is contained. The vessel containing the molding sand is connected to a pressure source by a valve device which controls the application of pressure to the molding sand. Additionally a vacuum device is utilized to apply suction tending to compact the sand within the vessel to produce a more cohesive mass.

Abstract: A critical gas boundary layer Reynolds number has been defined to indicate conditions under which glassy alloy ribbons with serrated edges and surface perforations result when processing under various gaseous atmospheres and pressures.

Abstract: A plate strap is die-cast integrally with an upstanding conducting member, which may be either a terminal post or a riser to form part of an intercell connector, by means of a mold having a cavity affording an elongated plate strap position which is closed at the top and has slots in the floor through which the plate lugs project, and a chimney position upstanding from the plate strap position to form the upstanding conducting member. The part of the floor between the plate lugs is formed by cylindrical dowels each having a diameter substantially equal to the spacing between adjacent lugs. The dowels are retracted to permit removal of the mold from the plate strap or straps. A single mold may form a row of plate straps associated with a number of intercell connectors and a pair of terminal posts.

Abstract: A continuous casting apparatus mold table supports a plate that in turn supports a mold extending through both. The table has opposite side walls extending above the plate, with each side wall supporting a shaft extending lengthwise of it between it and the plate and carrying lugs that overlap the adjacent marginal portion of the plate to clamp it on the table when the shaft is turned in the right direction and locked against reverse rotation. When the shafts are released, the plate and mold can be lifted past the lugs and removed from the table.

Abstract: A regenerator assembly for a gas turbine engine includes a center driven, rotatable disc type ceramic core with a hub and drive shaft including a chain driven sprocket fixedly secured thereto and wherein damper means including first and second relatively movable parts are connected between the sprocket and hub and a resiliently yieldable slipper is located in the hub and compressible to accept hub loads without taking a permanent set; the damper means and slipper combining to damp oscillations in said matrix disc drive shaft during operation of the regenerator assembly and further operative to isolate frangible material of the core from shocks imposed thereon by the drive thereto.

Abstract: An improved heat-cool room air conditioner unit control system having an electric timer located at the control area with the timer including a timer motor which runs continuously. A multi-gang selector switch is arranged in the control circuit with timer contacts and a single pole-double throw relay contact such that the selector switch and relay will selectively operate the unit in either a timed cooling mode or an untimed demand heating mode.

Abstract: This invention comprises a solar unit in the form of a window having a plurality of vanes extending thereacross connected for unitary pivotal movement relative to the frame, together with means for adjusting the vanes for the collection of solar heat in utilizing such heat to heat water or air circulated through pipes carried by the vanes and connected to suitable headers at each end of the vanes or adjustment of the vanes to permit air and light to enter the enclosure in a wall of which the window collector is mounted and to permit circulation of cold water or air through the pipes extending through the vanes to cool the interior of the enclosure, as well as to permit adjustment of the vanes in such manner as to, in effect, to close the window from the outside of the enclosure from the outside atmosphere enveloping the enclosure, and to position the vanes in such manner as to augment either the heating or cooling of the enclosure as desired.

Abstract: A heat dissipating and mounting structure for an electrical circuit includes a disc which is mounted to a rotatable shaft. The disc extends outward from the shaft to present a front surface upon which the circuit is mounted and a rear surface upon which cooling fins are formed. A pair of openings are formed in the disc and cooling air flows through them when the shaft rotates. The cooling fins are rotated through the air flowing through the disc openings and heat generated by the electrical circuit is carried away with little temperature rise and minimal disturbance of the air flow.

Abstract: Apparatus for heat exchange between a fluid and air, having at least one heat exchanger element comprising a plurality of fluid tubes to which are secured heat transfer strips which define between them air passages having length .ltoreq. 25 mm., hydraulic diameter < 2 mm, with each element being at an angle of at most 45.degree. to the relative flow direction of the air before its entrance into the heat exchanger; at the rear of each element the strips are bent to extend in the discharge direction of the air issuing from the heat exchanger.

Abstract: A fluid medium is conveyed along a conduit. During its passage through the conduit, the fluid medium undergoes temperature change. The change in temperature of the fluid medium is performed in a step-wise manner by indirect heat-exchange with a fluid flowing countercurrent to the fluid medium, that is, by means of a plurality of heat-exchangers arranged along the conduit. The fluid medium forms incrustations and the rate at which incrustations form is different at different temperatures. This is taken into account by providing for the ratio between the lengths of any two heat-exchangers to approximate the ratio between the rates at which incrustations form at the temperatures of the respective heat-exchangers. Of particular interest is the extraction of bauxite with sodium aluminate lye.

Abstract: The disclosure describes a technique for uniform heating of relatively large blocks of hydrocarbonaceous formations in situ using radio frequency (RF) electrical energy that is substantially confined to the volume to be heated and effects of dielectric heating of the formations. An important aspect of the disclosure relates to the fact that certain hydrocarbonaceous earth formations, for example raw unheated oil shale, exhibit dielectric absorption characteristics in the radio frequency range. In accordance with the system of the invention, a plurality of conductors are inserted in the formations and bound a particular volume of the formations. The phrase "bounding a particular volume" is intended to mean that the volume is enclosed on at least two sides thereof. Electrical excitation is provided for establishing alternating electric fields in the volume.

Abstract: Apparatus is disclosed for milling metal submerged in salt water or within a hole, such as cutting off the upper ends of pipes and casings in a well-drilling operation below the sea floor. A hydraulic motor is suspended in the hole and driven by sea water to rotate an electrical generator and to rotate a cutting tool. The tool includes radially movable, electrically conductive elements which form the cathodes of an electrochemical machining operation for removing metal. The tool elements include abrasive material so that they can mechanically cut through cement.

Abstract: Disclosed is a tester valve having a ball valve rotatable between the open and closed positions for use with a test string to test an oil well. The apparatus includes a ball closing piston in the valve operating mechanism which assists in rotating the ball to the closed position. One side of the ball closing piston is exposed to a first pressure of formation fluid flowing through the interior of the test string on the upstream side of the ball valve. The other side of the piston is exposed to a second pressure which is lower than the first pressure by a pressure drop caused as the fluid flows through the apparatus past the ball being rotated to the closed position. A bypass mechanism is additionally disclosed which is operable for equalizing the pressure on both sides of the ball closing piston when the ball is being rotated to the open position.

Abstract: A cultivating implement has a row of soil working members that are driven to rotate about upwardly extending axes and work overlapping paths. The working members each have freely rotatable tools which turn about further upwardly extending axes responsive to ground contact. The tools' axes of rotation can be angled to that of the corresponding working member. Also, one or more tines can be fixed in place to a support of the working member. A distribution member can be secured to the frame at the rear of each region of overlap of the soil working members to displace soil laterally. Also, an elongated supporting roller has portions with bent rods located to the rear of the distribution members. The rods engage the soil worked by the rotation working members and initially displaced by the distribution members. The bends of the rods can be positioned in line with the distribution members to further urge soil laterally of the direction of implement travel.

Abstract: An apparatus for converting centrifugal energy into percussive energy is operated by a motor continuously rotating a driven shaft whereby a rocking shaft is caused to oscillate about a pivot axis under the influence of the centrifugal force produced by a weight body during rotation of the driven shaft. The rocking shaft has a slot at its pivot axis and a bar extends through the slot and radially beyond opposite sides of the rocking shaft. Upon the rocking shaft oscillating in opposite directions, the opposite ends of the bar are deflected in opposite directions, so that one end of the bar urges a spring biased striker away from an anvil when the shaft rocks clockwise while the other end of the bar acts on the striker in a similar manner when the shaft rocks counter-clockwise.

Abstract: A method and apparatus for driving conductor pipe in an offshore drilling platform including the steps of mounting a block and tackle on the platform and then lifting a crane onto the platform with it before the drill rig is placed thereon, and driving the conductor pipe through use of a pile driver brought onto the platform with the crane, thus avoiding utilization of either a derrick barge or a drill rig for the conductor pipe driving functions.

Abstract: A hole-driving tool having an air-operated hammer for impacting against an anvil in the body of the tool to cause the tool to tunnel through the ground, wherein the direction of travel is controlled by providing a variable mass distribution over the hammer and anvil combination, and controlling the relative impact position of the hammer against the anvil.

Abstract: This invention relates to a method of setting a pile without causing any noise or vibration. A hollow pile is erected along a leader fixed on the ground, a screw auger is inserted through the hollow center of the pile, the screw auger is hung on the leader in such a manner that it can freely move up and down and freely rotate, and the pile is sunk by its own weight as the soil below the bottom of the pile is excavated and the excavated soil is carried above the ground. The present invention further relates to an apparatus for executing the above method. The lower part of the screw auger is constructed in such a manner that it is divided into two parts, inner tube and outer tube, and both tubes can rotate through a certain angle and move up and down in a certain range relatively to each other.

Abstract: A scale with a digital computing device and a digital display, in particular for weighing bulk goods, in which the weighing result is determined as a mean value over a measuring cycle, comprising means for assessing the difference between the results of two consecutive measuring cycles, means for comparing this difference with a pre-determined value and means for controlling the length of the measuring cycles in function of this comparison.

Abstract: Drive and steering mechanism for a vehicle embodying a frame supported by a pair of transversely spaced wheels separately connected to a pair of transverse shafts rotatable about a common axis with adjacent ends being rotatable relative to each other. A sleeve mounted non-rotatably on adjacent ends of the shafts is movable axially of the shafts to a first position in contact with both ends of the shafts so that both shafts rotate as a unit and to a second position in engagement with only one of the adjacent ends. Drive means connected to one of the shafts rotates the same while the sleeve is in the second position and rotates both shafts while the sleeve is in the first position.

Abstract: A hand guided power driven garden plow features a low profile double width tire to provide traction in sandy or soft terrain and a free-wheeling connection in the power drive chain to allow easy rolling of the plow without engine power. Another major feature is the provision of a solid steel sub-structure incorporated in the framework of the machine for greater weight and better balance and traction and for economy in commercial production of the machine. Another embodiment utilizes a dual traction wheel in lieu of the single double width tire or wheel.

Abstract: A hydraulic priority circuit for a fork lift truck having a primary work system for providing power steering and a secondary work system for raising a fork along a mast and for tilting the mast. A variable speed electric motor drives a variable output pump to supply pressurized fluid which is divided by a flow divider into two streams leading to the primary and secondary work systems, respectively. A priority solenoid valve is controlled by a device which detects preselected conditions of the truck to direct all the fluid in the stream leading to the primary work system either to the primary work system when the truck is in drive or is rolling, or to the secondary work system when the truck is in neutral and stationary.

Abstract: A power steering system for a wheeled agricultural tractor includes a pump circulating oil through a known steering-wheel-operated hydrostatic steering unit. A double-acting hydraulic cylinder communicates via conduits with the steering unit and is connectible to the tractor frame. A piston having a rod which projects from one end only of the cylinder is connectible to steer the tractor. A valve block interposed in the conduits causes oil displaced from the piston-rod end of the cylinder to flow to its other end when oil under pressure is supplied to said other end, and causes oil displaced from said other end to return directly to the steering unit when oil under pressure is supplied to the piston-rod end of the cylinder.

Abstract: An improved power steering system for displacing a tie rod connected to a wheel of a vehicle for rotational actuation of the vehicle wheel. Rotational actuation of a steering wheel of the vehicle correspondingly rotatively displaces a pinion gear mounted within a rack housing. The pinion gear matingly engages rack teeth of a rack member which is slidingly mounted within the rack housing. Relative displacement between the rack housing and vehicle frame actuates a hydraulic valve secured to the frame of the vehicle. Actuation of the hydraulic valve permits fluid under pressure to egress from the hydraulic valve through one of two outlet ports. The high pressure fluid is inserted into a power cylinder which drives a cylinder rod in a longitudinal direction. The cylinder rod is secured to a stabilizer tube mechanism which has a fork member secured to a movable element of the stabilizer tube and extending in a transverse direction to the longitudinal direction.

Abstract: A method and apparatus for determining the precise position of the drill bit on the bottom of a long drill string in a deep borehole in the earth during a drilling operation, comprising placing a plurality of geophones in an array near the surface of the earth above the expected position of the drill bit in the earth, causing at least a weak seismic wave to be initiated at the drill bit in the earth, repeating the source a great many times and determining at the surface of the earth the times of initiation of each of the seismic waves, determining the incremental movement of the drill pipe in the hole, and responsive to the known times of initiation and the known incremental movement of the drill pipe into the hole, stacking each of the repeated geophone signals from each of the geophones for each of the repetitions of the source, whereby each of the stacked signals will be in phase with those that resulted from earlier and later repetitions of the source.

Abstract: A bearing lubrication system for use in a gas turbine engine which utilizes empellers on the drive shaft to pump a lubricant into a lubricant transfer housing. At least one passageway is formed in the transfer housing which directs the lubricant from the pump to a bearing. The lubricant passes through the bearing and thereafter is returned to the pump for the beginning of a new lubrication cycle.

Abstract: A wheel chock comprising a molded body and a stabilizer bar principally housed in said body in retracted condition; said bar adapted to be extended whereby the weight of a vehicle resting on said bar holds said body firmly in place against a tire and restrains movement thereof.

Abstract: A disc brake of a type using pins for guiding a caliper in the axial direction of a rotor. A rigid sleeve having an elastic annular member inserted and secured to the inner circumference thereof is provided at a base portion formed on one side of the caliper or a support; while a guide pin which is secured to the other side of the caliper or support is slidably inserted through the elastic annular member.

Abstract: A disc-type brake apparatus adapted for installation in combination with the drawworks of a well bore drilling operation for automatically sensing any reverse torque situation in the drill pipe and quickly set the brake for precluding transmission of any reverse torque to the rotary table drive and clutch mechanism therefor.

Abstract: An electromagnetic rail brake for railway vehicles of the type comprising an excitation coil and at least one shoe element consisting of a ferromagnetic core having its pole faces turned towards the rail whereby, when the coil is excited, the shoe element is attracted onto the top surface of the rail.

Abstract: In this device, two stacks of discs form at least two sub-assemblies separated by an axially movable intermediate pressure disc, the first of these sub-assemblies being located between the intermediate pressure disc and a stop integral with one of the bodies, whereas the second is located between the intermediate pressure disc and an end pressure disc also axially movable, the control means exerting their action in the direction of the stop, first of all on the two pressure discs so as to cancel out the clearances between the discs of the first sub-assembly, then on the end pressure disc so as to cancel out the clearances between the discs of the second sub-assembly and finally on the whole of the discs of both sub-assemblies so as to compress them.

Abstract: A control unit comprising a casing, a drive shaft rotatably supported by the casing, a lever having a boss secured to the drive shaft, a shift rod extending through the boss and slidably inserted in a bore of the drive shaft, the shift rod being biased by a spring in a returning direction, a locking ring turnably supported on the outer periphery of the drive shaft, a drive gear rotatably supported by the drive shaft and having a toothed portion on part thereof and a circular outer peripheral surface continuous with the toothed portion, a driven gear rotatable by the drive gear, a drive plate having a drive pin implanted therein, a throttle cam having a specified cam groove receiving the drive pin therein and mounted on a pin on the driven gear movably in a direction at right angles to the drive shaft, a clutch arm having a clutch cable pivoted thereto, and a throttle arm having a throttle cable pivoted thereto.

Abstract: A self-centering clutch release bearing comprises an operating element, a drive element having an omnidirectional latitude of radial movement for the self-centering action, a cover axially connecting these elements together, and axially-directed resilient means integrated in the transverse wall of the cover for acting on the drive element. According to the invention, the transverse wall of the cover is provided with support zones which alternate with anchoring zones and which are offset axially in relation thereto, and the cover bears on the drive element only by its support zones.

Abstract: A device comprising a motor housing communicating with a pressure source and with the atmosphere through a traversable valve member operatively interlinked with the engine crankshaft, a link accommodated in the hollow space of the housing traversably in response to a pressure variation therein and operatively interconnected with the actuator of the clutch, a magnet for operating the valve member to disengage said clutch. Said operative association of said traversable member with the engine crankshaft is effected through an electric crankshaft speed transmitter and a transducer unit to convert the frequency of a signal from said electric transmitter into a current magnitude, the input of said unit being electrically connected to said electric transmitter and the output thereof, to the coil of said magnet, the armature of which is interconnected with the valve member. The construction of the device is simple, which enables the device to be located practically at any suitable place of a transport vehicle.

Abstract: In a clutch disk assembly having two structural units formed with window-shaped cutouts, at least two coaxially disposed force-storage devices received in the cutouts and braced against the structural units so as to afford limited torsional play of the structural units relative to one another, one of the structural units including two lateral disks mutually spaced-apart from one another in axial direction of the clutch disk assembly, the other of the structural units including at least one disk-like member disposed in the axial space between the two lateral disks, the two force storage devices includes a radially inner and a radially outer force storer, the radially inner force storer extending along the length of the radially outer force storer and, as viewed in circumferential direction of the lateral disks, having a portion thereof projecting beyond at least one end of the radially outer force storer, the cutouts being defined by contour portions of the two structural units conforming both to the radially

Abstract: Apparatus and method for automatically transferring articles from a continuously movable conveyor to a work station, and return, the transfer apparatus comprising a carriage mounted alongside the conveyor between the latter and the work station and for reciprocating movements along a path parallel to the movement of the conveyor. The carriage has two article support portions, one of which is adapted to receive an article from the conveyor and move it into the work station, and the other of which is adapted to receive an article from the work station and return it to the conveyor. The conveyor is provided with means for stopping selected articles carried by the conveyor to enable the transfer of articles from and to the conveyor to be effected. The movements of the carriage are controlled in such manner as to ensure the presence thereon of an article in readiness to be transferred to the work station prior to the completion of work performed on a preceding article in the work station.

Abstract: Disclosed are a method and an apparatus for transporting a group of yarn packages, wherein a plurality of yarn packages is separately placed on each of a plurality of trays and a plurality of the trays is placed on a pallet, and then, the pallet is transported between successive stages of yarn processing. Said method and apparatus attain efficient transportation of yarn packages and eliminate a great amount of manual labor in yarn processing.

Abstract: A loading trimmer for dispersing granular material from a loading chute in an adjustable trajector into the hold of a ship or the like. A trimmer carriage with spaced drums carrying an endless belt is positioned below the chute outlet and pivotal about the center of a pair of idler wheels which centrally engage the belt on either side thereof to form an arcuate material receiving and dispersing path. One of the drums is driven by a motor mounted on a remote pivotal platform connected to the trimmer carriage by connecting rods. The carriage is also connected to a remote crank through connecting rods and the crank is driven by a motor which controls the angle of the carriage with respect to the chute and the trajectory of the dispersion.

Abstract: At least one group of at least three elongated slats are mounted side by side on a frame for longitudinal reciprocation to form a conveyor, the slats being connected to adjustable drive mechanism which is operable in a first position of adjustment such that there are always a greater number of slats of each group moving simultaneously in a conveying direction, with the remaining slat or slats of each group moving in the opposite direction, and in a second position of adjustment such that all of the slats of each group move simultaneously in the conveying direction, to initiate movement of a load to be conveyed, whereupon the drive mechanism is adjusted to said first position of adjustment. In one embodiment of the invention, elongated flexible seals are provided between adjacent pair of slats, each seal being secured to one of the slats of the pair and slidably engaging the other slat of the pair, whereby to form a substantially non-porous conveyor.

Abstract: A flexible support for supporting a conveyor belt of a conveyor having a frame. The flexible support includes at least one flexible element extending beneath a portion of the width of the conveyor belt, which flexible element is attached in the region of the ends thereof to the frame of the conveyor. The length of the flexible element is greater than the linear distance between the attached ends of the flexible element and the flexible element delimits support areas for supporting a portion of the width of the conveyor belt extending at least on opposite sides with respect to the longitudinal median plane of the conveyor. The at least opposite side support areas of the flexible element are responsive to the travel of the conveyor belt for being drawn in the travel direction independently of one another.

Abstract: A flexible conveyor track assembly has segmented rails forming upper and lower runs, with the segments having tongues and recesses aligned with respect to the direction of conveyor travel on the respective runs. The individual segments of each upper rail are joined to a segment of a lower rail by connecting plates, and laterally spaced resilient guide rods string together the connecting plates on each lateral side of the assembly and have rubber spring dampers between adjacent connecting plates to damp segment vibration. A series of pivotally connected, elongated links, each longer than a single rail segment, runs the length of the segmented rails to control the curvature of the assembly, each link being attached to a segment of each rail. In an alternative embodiment, the track assembly is hung from a monorail and the series of links is replaced with an external draw bar between monorail hangers at the opposite ends of the assembly.

Abstract: A collapsible carrier for bottled beverages which is formed from a blank of paperboard, or similar material, cut and creased so that it may be folded and glued to provide, when set up, a bottom, upstanding side and end walls and a handle and partition structure which includes a multi-ply, longitudinal center partition and cross partitions on opposite sides thereof which divide the carrier into upwardly opening bottle receiving cells with the cross partitions being taken from the material forming the longitudinal partition and providing two plies of the blank material between points of bottle contact and with the center partition providing at least two plies of material between pairs of bottles and including a reinforcing panel which is folded upwardly from a hinged connection with a longitudinal partition panel and which is also folded upon itself.

Abstract: A compact, portable shaving kit comprising a shaving brush, a container for shaving soap, a container top having an annular member supporting the shaving brush in an upright position, and a cap for enclosing the brush.

Abstract: A disposable food tray and container system formed of at least a pair of container elements generally having an overall circular contour. The container elements include a central substantially planar member joined in one-piece formation to a rim element extending around the periphery of the planar section. The rim element has upper and lower elements with discrete apertures formed therethrough. The upper and lower rim elements are matingly interfaceable in order to provide a box-like structure. Upper and lower apertures may be aligned in a varying manner by slidable rotation of one element on another subsequent to the nesting interfacing and locking construction. By providing varying sizes of through openings determined by the position of the upper and lower apertures, the venting of vapors contained within the system may be adjusted as to the rate of dispersal to the environment.

Abstract: A method is disclosed for beneficiating an apatitic phosphate ore containing an alkaline earth metal carbonate mineral impurity, which includes conditioning the phosphate ore in an aqueous conditioning slurry containing a cationic reagent at a concentration sufficient to reagentize the ore; and subjecting the reagentized ore to a froth flotation process wherein the apatite is recovered in the froth concentrate and the alkaline earth metal carbonate mineral impurity is rejected in the underflow tailing.