Abstract: A child resistant buckle for seat belt restraints comprising a two-part buckle in which the female part, or part containing the release button, has a multi-part release button which can only be operated by a full size hand. A smaller, child's hand, having smaller fingers and thumbs, will not normally apply simultaneous pressure to all of the parts of the release button, which must be actuated simultaneously to release the other part of the buckle.

Abstract: A modular piston having a high tensile strength piston and rod connection produced without lubrication, weld splatter or other contaminants. The method produces an optimized joint from strength, concentricity and cleanliness standpoints. The parts are centered and connected in the same operation. With this connection an elastomeric bumper and bumper containment plate are retained in position for a complete assembly.

Abstract: A system for fabricating fan blades wherein the assembly includes a flat hub plate having generally radially oriented notches defined therein intersecting the plate periphery. Individual blades each include a hub connection portion adjacent an inner end region which includes parallel flat portions angularly related to the general blade configuration interconnected by a transition portion. The flat blade portions are located upon opposite sides of the hub plate and the transition portion extends through the hub plate notch. The flat portions are attached to the hub plate, and by predetermining the position of the hub connection configuration on the blade, the fan characteristics can be predetermined and accurately duplicated. The system permits a standard set of tools to form a variety of sizes of the fan blade components having various characteristics.

Abstract: The fly wheel and the ignition coil are set on the set jig with a comparatively large space left therebetween so that the two do not adhere to each other during the placement thereof. After the fly wheel and the ignition coil are placed on the set jig and are delivered to the two holding means of the assembling jig, a large space is maintained between the fly wheel and the ignition coil so that when the fly wheel is turned to be aligned, there is no magnetic force acting between the fly wheel and the ignition coil. Thus, the fly wheel can be easily assembled to the crankshaft. Thereafter, the ignition coil is brought to approach the fly wheel and is assembled to the engine main body where it is located at its normal facing position in relation to the fly wheel.

Abstract: A cassette pulley is assembled from a flange part having three assembly pins which are received in corresponding holes of a hub part. The hub part has a number of reinforcing ribs which divide the bottom of the hub part into a number of recesses which are conveniently employed to hold the hub part on a group of hub holding stub shafts during assembly. Because there are more recesses than holding stub shafts, the hub may assume more than one orientation relative to the stub shafts. In order to achieve proper relative orientation of hub and flange, the hub holder is formed with a hole that is aligned with one of the hub holes when the hub is in one of a selected group of orientations. Optical sensing of such alignment enables the flange to be positioned in an orientation appropriate for assembly of the flange pins into the hub holes.

Abstract: The securing and sealing of a connector 10 to a pipe 12 for a hydraulic connection comprises a pre-assembly step wherein a cutting/clamping ring 34 is secured to the pipe and a final assembly step wherein the ring 34 is sealed to a connector body 14. The axial force applied by a nut 20 to the ring 34 during the final assembly step is less than the axial force applied to the ring 34 during the pre-assembly step whereby no further cutting of the teeth 40 into the pipe is permitted but sealing takes place between cooperating conical surfaces 22 and 36 of the connector body and cutting/clamping ring respectively.

Abstract: An integrated down converter and interdigital filter apparatus having a down converter and the interdigital filter mounted on the same printed circuit board and installed in the watertight housing. The housing of the interdigital filter is cut from sheet metal and a conductive surface on the printed circuit board as one side. A method for construction of the interdigital filter is also set forth.

Abstract: A method of assembling a magnetic head in which a block of wear-resistant material is placed in an indentation at an upper corner of one or more core holders, over which the recording tape is to slide. Grooves are formed on lateral faces of the core holder and the wear-resistant material into which cores and shield plates are inserted. Then two core holders are abutted, with a gap between the so formed lateral faces.

Abstract: A first magnetic layer is formed upon a non-magnetic substrate, a gap layer is formed upon the first magnetic layer, a conductor coil covered with an insulation layer is formed upon the gap layer, a second magnetic layer is formed upon the gap layer and the insulation layer, a magnetic gap being formed between the first and second magnetic layers at a front portion facing a recording medium, and the second magnetic layer being connected to the first magnetic layer at a back portion. After forming a mask made of metal oxide upon the second magnetic layer, the second magnetic layer, the gap layer, and the first magnetic layer are formed into a predetermined shape respectively at the tip portion by dry etching. Thus, a high performance thin-film magnetic head having the same widths for the first and second magnetic layers is obtained.

Abstract: The apparatus includes a housing accommodating, in succession of the process procedures, a mechanism for moving and separating magnetic cores and a magnetic head of a unit for orientating the magnetic cores above which there are disposed coordinate lines having the magnetic cores threaded thereon. The mechanism for moving and separating the magnetic cores includes distribution and guide combs spaced from each other and having teeth thereof facing the side of the coordinate lines. Arranged after the guide comb before the magnetic head is a comb for separating the magnetic cores, teeth of this comb having a bevel facing the side of the guide comb. Disposed in close proximity to the coordinate lines is a unit for pneumatically conveying the magnetic cores. All the combs and magnetic head rest in planes perpendicular to the plane of arrangement of the coordinate lines and are turned relative to these lines at an angle other than 90.degree.. The housing accommodates a programming mechanism with a control unit.

Abstract: A singulation system wherein a multiplicity of circuit board members, or the like, can be fabricated by assembling components in a predetermined array on a large planar board-like member with portions of the large member defining independent circuit board assemblies which are separated from each other by intervening slots. The system includes readily adjustable punch and die plate members and accomodating platens which accomplish separation of the independent board assemblies from the large board arrangement without damage to the components mounted thereon.

Abstract: A printed circuit for mounting and connecting a plurality of semiconductor devices is disclosed and includes a planar insulating substrate having multiple conductive layers disposed in overlying relationship within the planar substrate. A plurality of parallel rows of apertures for wire wrap, quick connect or stitch wire contacts are provided for mounting integrated circuit. One side of the printed circuit board includes a plurality of power and ground connections disposed between each pair of parallel rows of apertures so that filter capacitors may be mounted under each integrated circuit, thereby conserving printed circuit board space. In a preferred mode of the present invention, alternate ones of the conductive layers are coupled to a source of electrical power while all remaining conductive layers are gounded. At least two adjacent conductive layers are then utilized to minimize parasitic capacitance by completely surrounding each aperture with a portion of conductive material.

Abstract: A disposable combination razor and shaving cream dispenser having an aerosol actuated push button shaving cream dispenser and a movable cap having a removable and replaceable razor blade at the upper end. The cap has an internal passageway having the valve stem of the dispenser disposed therein. When the cap is pushed downwardly, the valve stem is depressed which dispenses shaving cream through the passageway. The passageway opens at a point below the razor blade and may open at any point around the outer periphery so as to provide for convenient and safe dispensing of the cream.

Abstract: An improved razor apparatus is provided to enable use in two positions for shaving. The improved razor apparatus includes two components, an easily adjustable razor body and a handle. The razor body is comprised of dual razor heads which may be easily adjusted from a wedge-shaped position to a straight edge position, by applying pressure, such as made by a finger, to a hinged razor cap crown connecting the dual razor-heads. The razor body maintains its wedge-shaped position by means of a locking clasp placed between the sides of the hinged razor cap crown. The handle is demountably attached to the dual razor heads by flexible arms, allowing adjustment between the wedge-shaped position and straight edge position without detachment of the pair of arms.

Abstract: A pair of scissors having a pair of blades which are slidingly fitted between a pair of handles which are pivotally supported one on the other. The blades are drawn out when the scissors are used, and they are accommodated between the handles when the scissors are not used, thus enabling the scissors to be easily carried.

Abstract: A head-held, pressurized fluid operated, shears unit for use in the processing of poultry and the like. The shears unit has a body member having a weight and size for ready grasp by a user. One of the cutting blades is fixed in position, and the second blade is pivotally-mounted so as to move toward and away from the first blade to effect a cutting action. The motion of the pivotal blade is effected by connecting that blade, through a pivotal linkage, to a reciprocatable piston rod that extends from a forward end of the body member. This piston rod is fastened at a second end to a double-acting piston within a piston cylinder in the body member. A master valve operated by a lever for grasp by a user directs the pressurized fluid to one of two sides of the double-acting piston so as to effect moving of the piston and piston rod and thus opening or closing the pivotal blade with respect to the fixed blade.

Abstract: In a gyro apparatus comprising a binnacle, a gyro the spin axis of which is made substantially horizontal, a supporting apparatus for supporting the gyro from the binnacle with a freedom of three axes, a north-seeking apparatus for giving a north-seeking action to the gyro, a follow-up ring following up the gyro around its vertical axis, a servo motor for rotating the follow-up ring by a deviation singal around the vertical axis of teh gyro relative to the follow-up ring and a transmiting apparatus for transmitting an azimuth angle of the spin axis relative to the binnacle to the outside, the gyro apparatus is characterized in that the transmitting apparatus is formed of a digital encoder having a reference angular position transmitting device and a first counter apparatus being made operable by an output signal of the encoder.

Abstract: In a dimensioning head for a plug gage, a pair of exteriorly projecting balls project through openings on either side of the longitudinal axis of the housing for contacting the inside diameter of the bore hole to be measured. Each of the balls contact a V-shaped groove of a guide surface to the housing to ensure accuracy and repeatability of measurements.

Abstract: An electronic compass and method. The electronic compass includes circuitry for generating a control signal and circuitry responsive to the control signal for producing reference signals having a frequency established by the control signal. The compass also includes circuitry for phase shifting the reference signals to generate an output signal shifted by a phase shift which is a function of the angle between a reference heading of the compass and the direction of the magnetic flux lines of the earth's magnetic field in a local area. Further, the compass includes circuitry for monitoring the frequency of one of the reference signals, for varying the control signal to thereby cause reference signals having a predetermined frequency, and for measuring the phase shift between the monitored reference signal and the output signal to calculate the angle between the heading of the compass and the direction of the magnetic flux lines of the earth's magnetic field in a local area.

Abstract: A fluxgate compass direction sensor in which a fluxgate is mounted relative to a receptacle by means of a flexible circuit. The fluxgate is also suspended in a liquid by means of a float. In use, if the receptacle tilts relative to the horizontal, the level of the liquid will move to retain a horizontal aspect and the float, being buoyant in the liquid, will retain the fluxgate in the horizontal plane. The flexible circuit acts to allow tilting of the float and fluxgate relative to the receptacle while retaining the fluxgate in lateral and directional alignment relative to the receptacle.

Abstract: A device for installing an article on a vertical surface is disclosed. The device includes a base and a first longitudinal member connected to the base. A second longitudinal member is slidable longitudinally relative the first member. The second longitudinal member is in a telescopic relationship with the first longitudinal member enabling the distal end of the second longitudinal member to be varied in vertical height relative to the base. A template frame is secured to the second member and a plurality of punches are disposed in the frame. The device also includes a lock for locking the relative position between the first and the second longitudinal members, enabling an operator to position the template frame a predetermined distance vertically above the base with the template frame being located in contact with the vertical surface to form an aperture in the vertical surface upon depression of at least one of the plurality of punches to install the article on the vertical surface thereby.

Abstract: An adjustable marking gauge provides an x-y adjustment capability especially adapted to enable conventional drawer and cabinet hardware to be conveniently mounted. The marking gauge includes a body portion in the form of a rectangular block from which an adjustable slide arm projects. The slide arm has a J-shaped end portion and markings which enable distances from the midpoint of the block to be measured easily. An adjustable slide bar is connected to the block and is movable perpendicular relative to the slide arm. The slide bar includes preformed openings corresponding to the dimensions of conventional drawer and cabinet hardware.

Abstract: A student's multi-function protractor for conveniently drawing different geometric figures including a transparent middle plate which fits on the retainment space between an upper base and a lower base. The middle plate is rotatable in the retainment space. The circumferential edge with the middle plate of the upper base has a 360 degree scale. In addition, the middle plate has a plurality of parallel grooves which are scattered on one side from the central point for providing direct drawings. By accompanied with the grooves, scales and the indication elements on the middle plate, the protractor of this invention is used to easily draw different geometric figures.

Abstract: A tool for setting the width of a space between the tips of a pair of burner ignition electrodes so that an electrical spark will jump this gap, and the axial and radial distances of these tips forward of the center of a fuel nozzle outlet so that fuel discharged by the nozzle will be ignited smoothly and will not cause carbon deposits to build up on the tips. The nozzle is removably threaded in a threaded opening of a fuel supply pipe and is replaced by the tool during the setting operation. The tool has a threaded shank and a stop flange for supporting and positioning an annular groove of the tool so as to receive and set the ends of the electrode tips in the correct position. The groove is in an annular face formed by a shoulder of the tool and has an outer wall for holding the ends of radially extending electrode tips in the groove as the tool is rotated into a seated position in the fuel supply pipe opening.

Abstract: The invention relates to a method for drying or cooling particulate materials in a machine where said particles are made to circulate, with a particle flow moving downwards along the inside of a chamber wall. The method is characterized in that a cooling or drying agent, or the like is introduced from above into the interface area between the particle flow directed downwards and the chamber wall.

Abstract: A custom-fit ski boot orthotic which efficiently transfers movement of the foot to the edges of the skis. The orthotic has a substantially rigid base plate attached to a rigid heel post. The base plate has an arch portion 20-40% shallower than the skier's actual arch which permits the limited movement necessary for foot comfort, without any significant loss in transfer efficiency. The base plate also has a heel cup portion to prevent heel roll. The orthotic of the present invention may be used as an insert or be built into the footbed of a ski boot.

Abstract: An excavator for use in tunneling operations wherein there is minimal head room, comprising a boom mounted to a mobile carriage for rectilinear movement in a horizontal plane and angular movement in a vertical plane. A rigid arm is pivotally mounted at one end to the distal end of the boom for angular movement relative thereto and a slide is supported by the arm for rectilinear movement thereon. The backhoe is fixed to the slide and there is linkage for manipulating the backhoe.

Abstract: The invention relates to a dragline bucket wherein the center of gravity is along a line making an angle of at least 90.degree. with a line from the tooth tip to the horizontal pivot axis of the dragline hitch. Also disclosed is a movable hitch.

Abstract: A price board is described comprising a holder (10) for carriers for representing price information and/or other article information made up of a plurality of characters. At least the carriers for representing the individual characters at the points of the price information are cassettes (12) which are connectable to the holder (10) and each of which contains a complete set of all characters to be represented with them.

Abstract: A device for displaying decorative articles such as photographs, greeting cards, or the like having five sections which are pivotably attached to one another for rotation about the pivot in adjacent parallel planes so that the sections may be shaped to conform to various patterns such as the arch of a doorway or the outline of a window frame and folded into a single longitudinal section for easy storage and packaging. The display is adaptable to various size doorways by providing a slideable attachment with respect to the relative edge of at least two adjoining sections. The display may be utilized for supporting and displaying decorative articles in a convenient and attractive arrangement.

Abstract: Card or postal media which comprises a storage member to retain audio information picked up by a microphone, a sound generating member including a speaker, a mode selection signal producing member to allow either record or playback to be selected, a controller performing record or playback according to the mode selection signal from the mode selection signal producing member; converting the audio signal from the microphone from analog to digital and storing it in the storage member when the record mode is selected; retrieving stored information from the storage member, converting it from digital to analog, and outputting the analog signal to the sound generating member when the playback mode is selected, and a card board on which the microphone, speaker, and the other members are mounted.

Abstract: An elongated plant labeling tag has an opening adjacent a first end of encircling the stem of a plant. A notch in the first end has a slit projecting toward the opening leaving a thin web between the slit and the opening. A plurality of such tags are lightly attached along the longitudinal edges thereof and provided with sprocket holes along the lateral edges thereof to permit printing of the tags in a tractor feed printer; the web functioning to prevent lifting of portions of the tag from the printer platen which causes jamming of the tractor feed.

Abstract: A wearing apparel device and a method of using it, includes a plate depending from a clothes hanger. A support device on the plate attaches a group of neckties to the hanger in a pre-determined separated manner. A group of garment indicia devices are disposed adjacent to the support device for indicating other garments to be worn with each individual necktie being attached to the hanger at individual necktie locations.

Abstract: A rear illuminated device for displaying prices of articles is of the type that includes a housing, a light source in the rear of the housing, a front frame mounted on the housing which has a plurality of horizontal rows of windows, each of said windows being adapted to display one rear illuminated numeral of the price of an article, a film strip carrier in closely spaced cooperating relationship with each window, and each said carrier cooperating with the front frame to define a guide slot in which a section of a film strip is held effectively flat in the window, and a film strip supported on each carrier for endwise movement through a guide slot, each section of a film strip being adapted to display one of the numerals from 1 through 0 in the window. Each film strip is a continuous loop which loosely encircles the film strip carrier and is positioned entirely forward of the light source in the housing, and adjacent film strip loops are in side abutting relationship so as to be mutually confining.

Abstract: A lamp base houses a source of black light. An upstanding transparent acrylic sheet is edge lit by the black light source. Fluorescent paint on the surface of the acrylic sheet is excited by the black light, which causes the sign to light with an appearance somewhat similar to the appearance of a neon sign. The acrylic sheet is designed to snap into and out of the lamp base so that one sign may be substituted for another, quickly and easily.

Abstract: A display device includes a component in the form of a plate bearing one or more display indicia on one plate surface and having a passage extending through the plate adjacent the display indicium. An integral light-transmissive element is fixedly secured in the plate passage and has a first lensed surface at one end adjacent the display indicium. At its opposite end, the light-transmissive element defines both a second lensed surface and a flat surface in abutting relation to a stepped part of the passage within the plate. The first lensed surface is convex relative to the light-transmissive element and the second lensed surface is concave relative to the light-transmissive element. The element, comprised of a polycarbonate film which is highly resistant to impact damage, is of dimension relative to the passage such that an interference-fit exists therebetween.

Abstract: A manually actuated safety mechanism for a hand gun particularly of the type incorporating a rebound lever which is activated by a main spring to in turn position an internal safety or firing pin block accompanying the gun structure when manufactured, thereby blocking the hammer from engaging the firing pin. The safety mechanism is mounted within the handle of the hand gun and includes minimal moving parts and is disposable and configured to prevent travel of the rebound lever from a blocking position to a release position thereby preventing cocking of the hammer to accomplish proper positioning of the hammer, trigger assembly and firing pin block for the next firing cycle.

Abstract: The present invention relates to a receiver and a recoil lug for a gun. The receiver and the recoil lug with which the receiver is arranged to be fastened to the stock of the gun, are manufactured as separate pieces in accordance with the invention. A characteristic of the invention is that the receiver is manufactured by cold-hammering, inner and outer surfaces thereof are finished. Another feature of the present invention is that the recoil lug is fastened to the receiver by driving the same to form a tight force fit between the two, with guiding surfaces for the gun barrel being formed onto the receiver and onto the recoil lug. The receiver is manufactured to be substantially symmetrical with respect to a longitudinal axis thereof, with an external, shouldered connecting surface being shaped onto the receiver. An annular inner surface is shaped onto the recoil lug which, together with the connecting surface of the receiver, forms the force fit.

Abstract: Fishing lures which have a leadhead, soft polymeric body and a fishing hook extended from the body are prepared by using a leadhead with a releasable hooking means for releasably holding a fishing hook, whereby the leadhead and releasable hooking means are positioned into the front of the soft polymeric body and the fishing hook is positioned into the back portion of the body and attached onto the releasable hooking means. Thereby allowing multiple fishing hooks and different placement of fishing hooks than possible with the one piece leadhead and fishing hook arrangement of the prior art.

Abstract: A fishing lure which is characterized by a molded lure body such as a lead jig head and a non-magnetic metal cylinder or capsule provided with at least one non-magnetic ball therein, the capsule inserted in a cavity provided in the jig head, in order to produce a sound of desired intensity and resonance and attract fish when the fishing lure is retrieved. In a preferred embodiment the jig head is fitted with a flexible tail and is molded with an internal cavity of appropriate size for receiving an aluminum or stainless steel capsule which is constructed with an open end for inserting a selected number of spherical brass, bronze or stainless steel balls and a plug or cap for sealing the open end of the capsule when the capsule is inserted in the cavity. The number of spherical balls utilized in the aluminum or stainless steel capsule depends upon the size of the capsule, which size is, in turn, determined by the size of the jig head in which the capsule is inserted.

Abstract: An adjustable bait-receiving fishing lure is disclosed for use in receiving baits of varying size and producing differing lure retrieval patterns. The bait-receiving lure includes a top section and bottom section that cooperatively engage the upper and lower forward portions of a bait. A diving lip controls the depth at which the lure is retrieved and provides a swimming action. A screw, passing through disc-like portions of the top piece, bottom piece, and diving lip allows the relative orientation of these components to be adjustably secured. In this manner, baits of varying size can be accommodated between the top and bottom sections, while the diving lip is adjusted to produce a desired lure retrieval pattern for the particular size of herring and trolling speed involved. To adjust the lure's action, the line is attached to the diving lip by a removable and rotatable, frictionally secured plug.

Abstract: A spindle for accommodating fishing tackle has an elongated cylindrical member rotatably mounted on a pair of double-hooked brackets. Each bracket has a downwardly open clip adapted to be mounted on a tray of a fishing tackle box. The lower end of each bracket has an upwardly open hook rotatably accommodating axles secured to the spindle. A crank secured to one axle is used to manually rotate the spindle. The spindle has an outer cylindrical surface having grooves for accommodating fishing tackle and leaders. Outwardly directed hooks located adjacent the grooves are used to anchor the fishing tackle to facilitate the winding of the tackle on the spindle. Fish hooks attached to leaders are embedded into the spindle to retain the leaders around the spindle.

Abstract: Apparatus for capturing birds and other animals may comprise: a pair of carrier poles the proximal ends of which may be anchored to the ground for pivoting from first parallel positions against the ground to second parallel positions against the ground. A semicylindrical net is provided one longitudinal edge of which is affixed along the ground and the other longitudinal edge of which is fixed between the distal ends of the carrier poles so that upon movement of the carrier poles from their first to their second positions the net is deployed in a semicylindrical configuration to envelope animals beneath the net.

Abstract: A device for assisting the growth of a plant by providing shelter and physical support therefor is taught in the preferred embodiment of a modular construction including a tubular section, a cover, and a collar. The collar provides a gradually curving continuous support to the upper growth portion of the plant for helping to reduce breakage of the plant from bending due to the weight of the plant. In the preferred embodiment, the collar includes arcuate sections of varying radii, with the first arcuate section connected tangentially to the tubular section, with the second arcuate section extending radially outwardly and continuously from the first arcuate section, and with the third arcuate section connected to and extending radially outwardly, downwardly, and continuously from the second arcuate section. An outer rim extends from the third arcuate section for reinforcing the collar.

Abstract: A cultivated plant either which blossoms or has only leaves can be provided over a long time interval simultaneously with moisture and a nutrient material without watering. A root ball containing the nutrient material including the roots of the plant is surrounded by a moist material which simultaneously uniformly feeds it and supplies it with moisture. This moist material is advantageously formed from a mixture of swollen and then broken clay pieces and from a plurality of cellular or foamed plastic material pieces which is provided surrounding the root ball in a container for the plant advantageously in the ratio of about 2:1 or 3:1. In this way the plant with the usual earth or humus root ball can be provided with moisture uniformly over a long time interval without requiring that a particular container or plant be used.

Abstract: A latch for a pivotal window sash used in a double-hung window assembly. The latch is mounted internally in a sash frame member with its latch bolt protruding from the sash to engage in the guide rail of the main frame jamb of the window assembly. There is a finger manipulative control button external of the sash frame for releasing the bolt from said guide rail so that the window sash can be pivoted. The latch bolt is mounted under spring tension to maintain the bolt normally in a locked position. The several latch parts including the spring are maintained together in assembly as a unit to thereafter be installed in said window sash.

Abstract: A garage door opener is mounted on a fence to move a roller gate horizontally across a fence opening. A trolley connected to the gate slides on a horizontal guide which is mounted on the fence, extending between the fence and the gate in its open position.

Abstract: A door frame having a hinged jamb, a strike jamb and a header, each of which is in two parts. One part of each pair has a channel for slidably receiving a lipped segment of the other part. A lipped cover on the first part engages the lipped segment of the second part to limit movement of the two parts relative to one another. A biasing means on the first part urges the two parts against one another. The biasing means is rigidly affixed to the first part and extends across the channel to leave a small gap through which the lipped segment of the first part can be rotatably inserted.

Abstract: A grinding wheel position detecting means for a surface grinding machine, in which a super-grain grinding wheel is composed of a base metal fastened to a longitudinal end portion of a rotating shaft and a super-grain layer provided on a longitudinal end face of said base metal, and a longitudinal end face of the super-grain layer is utilized as a grinding surface.

Abstract: A grinding wheel coolant distributor system is set forth utilizing a frusto-conical receptacle attached to a grinding wheel body which receives coolant from a fixed single point inlet and delivers the coolant along radially-outwardly and diverging inner sidewalls to a plurality of passages extending through the grinding wheel body to a distributor plate, which in turn, through centrifugal force distributes the coolant in a uniform thin film flow to the active abrasive face of the grinding wheel.