Abstract: 7[D-(-)-.alpha.-amino-.alpha.-(p-hydroxyphenyl)-acetamido]-cephalosporanic acid and 7-D-(-)-2,2-dimethyl-4-(p-hydroxyphenyl)-5-oxo-1-imidazolidinyl]cephalospo ranic acid and the corresponding decephalosporanic acids and the salts thereof are new synthetic compounds of value as antibacterial agents and in the treatment of bacterial infections.

Abstract: An electric motor is composed of two counter-rotating discs having intermeshing gearing and each carrying a plurality of permanent magnets radially arranged with the same poles at the periphery of both discs. A shield of magnetic material is provided at one side extending partly around the periphery of each of the discs and into substantially the bite of the discs. An electromagnetic is arranged with one pole adjacent the bite of the discs, with means to energize the electromagnet as each of the permanent magnets reaches the bite of the discs to create a field of such polarity as to make the magnetic poles of the adjacent permanent magnets move away from the bite of the discs in the direction away from the shield, utilizing the combined forces of the electromagnetic force and the repelling force of the permanent magnets to effect rotation.

Abstract: A non-destructive testing system for detecting longitudinal and transverse defects, simultaneously, in metallic tubes or pipes in which a plurality of essentially punctiform magnetic sensing elements are disposed along a generally straight line adjacent the workpiece surface. A mechanical oscillator reciprocates the sensing elements along a line parallel to that of the sensing elements disposition. Adjacent elements are electrically connected in opposition to form differential probe pairs, the line connecting the adjacent probes to form the differential pairs being inclined at 45 degrees to the line of reciprocation. In addition to providing for the simultaneous detection of longitudinal and transverse defects, the system disclosed can resolve the signals from ID and OD defects to a degree heretofore unobtainable.

Abstract: A protective device particularly suited for use by male athletes characterized by a guard for protecting the pelvic organs including a protective cup configured to be positioned in protective relation with the groin of the wearer, a plate adapted to be received over the lumbar region of the wearer, and a protective bar extended between the cup and the plate suitably dimensioned to be received between the thighs of the wearer in protective relation with the pelvic organs, and a pair of trunks fabricated from elastomeric material and characterized by pockets formed in the front and rear portions thereof for maintaining the guard in place.

Abstract: A workman's break-away safety apron has a body portion provided at four intersecting edges with segments of fabric pressure fastening material. A neck band has segments of fabric pressure fastening material at the opposed ends thereof. A waist band is formed in two pieces one of which has a segment of fabric pressure fastening material at one end and a plurality of button holes at the other end and the other piece has a segment of fabric pressure fastening material at one end and at least one button at the other end. The segments of pressure fastening material on the neck band and waist band elements are cooperable with the segments on the body portion and thus detachably secure the neck and waist bands to the body of the apron.

Abstract: A plurality of disposable cuff protectors formed consecutively on a double layer roll of sheet material, by releasably sealing the sheets together along narrow transversely running linear area axially disposed along said sheets. A perforated tear line is disposed within each releasable sealing area for individually separating the cuff protectors one from another. The linear sealing areas are disposed along said sheet with a first plurality of parallel areas placed at an angle to the edge of the sheets, and a second plurality of parallel linear sealing areas intermediate said first sealing areas placed at an angle to said sheet edge and at an angle to said first areas forming cuff protectors having a narrow opening at one end and a wide opening at the other end.

Abstract: A face mask comprising an elongated sheet of porous material having upper and lower longitudinal edges and transverse side edges. A line of stitches of elastic material is sewn to the material along both its side edges, and a length of elastic cord at each side edge is secured to the material by interweaving with the line of stitches thereat. A free intermediate portion of the elastic cord is formed between the ends at which the cord is interwoven with the stitches to the porous material, and the free intermediate portion forms an ear loop. The elastic material is sewn to the porous material and interwoven with the cord lengths while the porous material is taut so that when the porous material is relaxed, the elastic material exerts a pull on the porous material to gather and contract the material at the side edges.

Abstract: An inflation device comprising, an inflatable member having a fluid receiving cavity and an opening extending through the member to the cavity. The device has a fluid lock element secured to the inflatable member in the opening, with the lock element having flexible wall means defining a chamber, first opening means extending from the chamber toward the outside of the lock element, and second opening means spaced from the first opening means and extending from the chamber toward the cavity. The first and second opening means are normally closed to prevent passage of fluid therethrough, with the first opening means being openable to permit passage of the tip of an inflation needle from the outside of the lock element to the chamber, and with the second opening means being openable and positioned to permit passage of the tip of the inflation needle or fluid from the chamber to the cavity.

Abstract: A lens suitable for implantation in an aphakic eye is provided with a supporting system useful in positioning the lens in either the posterior or anterior chamber and which accommodates to normal function of a dynamic pupil. The supporting system includes flexible spring-like members structurally designed to follow a dilating and contracting pupil with negligible force against a normally dilated iris diaphragm while providing for automatic centration in the pupil and permanent longitudinal fixation of the lens under normal and extreme conditions of dilation.

Abstract: An apparatus for controlling the quantity of water flowing through a water outlet in the tank of a toilet comprising a timer including a rotatable output shaft, the timer being responsive to the angular rotation of the shaft from an initial position and operative to return the shaft to the initial position after a time duration corresponding to the amount of angular rotation of the shaft, a crank coupled to the shaft and being capable of rotating the shaft through a predetermined angle when a force is applied to it, a mounting assembly for mounting the timer to the tank, and a mechanical linkage coupled between the shaft and a lift rod in the tank for moving the lift rod a dimension such that a valve is unseated when the shaft is not in the initial position, and the valve is seated when the shaft is in the initial position, whereby when a force applied to the crank rotates the crank and hence the shaft through the predetermined angle the linkage is moved a dimension sufficient to unseat the valve from the wat

Abstract: A single device provides means for either scratching or scrubbing the back of a user as desired, which comprises a pair of similar operating elements having front and back surfaces, wherein the front surfaces carry the back-contacting instrumentalities and the rear surfaces are provided with rearwardly-extending supporting members having suction cups on their outer ends. The operating elements are in substantial edgewise alignment and are connected by means which permit relative pivotal movement about a vertical axis. The result enables the user to back against the device and so move with respect thereto in such a manner as to obtain the desired scratching or scrubbing effect.

Abstract: An apparatus for maintaining a predetermined liquid level within a tank while effecting the continuous addition and removal of liquid within the tank. The apparatus is provided with a housing that mounts directly on a side wall of the tank with the housing extending on both sides of the wall, so that it is partially inside and partially outside the tank. The housing has a first passageway which receives fresh liquid from a pressurized supply and introduces a portion of the fresh liquid into the tank. The remainder of the fresh liquid is provided to a second passageway which is connected between the first passageway and a drain. The second passageway has a constriction near its inlet, which accelerates liquid flowing through it and injects the liquid into the second passageway at a high speed. This produces a region of low pressure in the second passageway. A third passageway is connected to the region of low pressure and it is coupled to the water in the tank.

Abstract: An off-set flange for mounting a water closet, the off-set flange comprising an open topped body having a discharge spout for connection of the open topped body to the water closet stub, the body being open so the joint can be caulked all around, and a plurality of covers for the open topped body, each cover being attachable to the body in more than one position to locate an opening in the cover in a selected position to be aligned with the horn of the water closet.

Abstract: A shampoo aid that comprises a cape adapted to fit over the shoulder area, a neck covering portion adapted to receive the chin, a rearwardly disposed slide to receive the water and carry it away from the head and a shampoo hose and hose fitting to communicate with a water faucet.

Abstract: A sheet-spread includes an integral elongated sleeve formed from a fold of cloth secured to the body portion along a line parallel to the transverse axis thereof and adapted to retain one or more pillows.

Abstract: A marine tank mount for vessels characterized by a proximately horizontal rack mounted on a deck or other member of the vessel and provided with an opening. A tank is mounted on the rack, with the annular bottom flange of the tank extending downwards through the opening. A pair of diametrically opposed holes are provided in the flange below the level of the rack, and a locking bar which may or may not be made of spring-like material is inserted through the holes, whereby the tank is attached to the vessel above the deck of the vessel. The tank will typically contain a fuel such propane, butane or gasoline or other highly volatile and inflammable fuel, or may alternatively contain a fluid chemical or the like which may be corrosive in nature.

Abstract: A rescue device particularly adapted for use with small boats. The device includes a plurality of bodies each formed with an aperture large enough to facilitate either manual grasping of the body or for receiving a foot of an individual to be rescued, the several bodies being interconnected in a given sequence by connecting units which form with the bodies a chain-like structure by means of which an individual can with his hands and feet climb upwardly along the structure back to a vessel.

Abstract: A feeding device for a high speed nut former machine is disclosed having a mechanism mounted on the machine and attached to a feeding plate capable of advancing in a linear fashion and returning in a motion in which the feeding plate is removed from a guide path. The feeding plate has a plurality of indentations of a configuration suitable for holding and conveying the nut blanks being formed along the guide path defined by guide plates between successive nut blank forming dies due to the motion of the mechanism attached to the feeding plate by causing the indentations to mesh with the blanks and to convey the blanks forward in a linear fashion, to next leave the feeding path, and to then return to the original position. In this manner, nut blanks are successively fed in an intermittent fashion from one die to the next in a plurality of steps.

Abstract: A frame construction for an adjustable, pit mounted dockboard. The frame includes a rear frame section and a front frame section which are connected solely by a tubular housing that contains a spring for the ramp counterbalancing assembly. Leveling members are adjustably mounted for free vertical movement on the base member of each frame section, and after levelling of the frame in the pit, the leveling members are welded to the frame sections to support the frame in the leveled condition.

Abstract: A support structure is provided for recessing below the upper surface of a floor or walk and an elongated horizontal grill is mounted from the support structure and includes a plurality of elongated horizontally laterally spaced apart grill members spaced longitudinally along and extending transversely of the grill. The grill members are free of interconnecting structure throughout substantial portions of their length aligned longitudinally of the grill and a pair of parallel rollers are journaled from the support structure and spaced beneath the grill with the rollers extending longitudinally of the grill and transversely of the grill members. A wide endless flexible belt is trained about the rollers and includes outwardly projecting bristles projectable upwardly through the generally vertical slots defined between adjacent grill members. A motor is supported from the support structure and drivingly connected to one of the rollers whereby the belt may be orbited about the rollers.

Abstract: A vehicle wiper blade comprises a yoke which is advantageously made of a plastic material and is provided with means such as a mounting pin for pivotally mounting it on a wiper arm. The underside of the yoke includes downwardly extending and laterally offset pairs of depending arms which extend downwardly and inwardly from respective sides of the yoke to form a supporting surface spaced from the bottom of the yoke. A wiper blade includes a web portion with a flat surface which is disposed between the support surface and the bottom of the yoke and a blade which projects downwardly between the supporting elements of the yoke for engagement with the windshield. A spring member is inserted between the web of the blade and the bottom of the yoke and both the spring member and the table web portion are provided with a cutout area which aligns beneath a slot defined through the yoke.

Abstract: A thread cleaner for cleaning the pin end of a pipe or tubular member includes a housing with radially adjustable, rotatably mounted brush means therein for engaging the pin end of the pipe or tubular member to clean the threads on the pipe. Power means are adapted to be mounted on the housing for rotating the adjustably mounted brushes with conduit means for injecting solvent or cleaning fluid into the housing as the threads are cleaned and thereafter discharging the solvent or cleaning fluid from the housing.

Abstract: A hollow cylinder is open at one end and closed at the other. A first ring shaped cleaning brush having an outer diameter essentially equal to the inner diameter of the cylinder is disposed concentrically within the cylinder abutting the closed end and has a first inner diameter. A second ring shaped cleaning brush having a like outer diameter and a second inner diameter larger than the first inner diameter is disposed concentrically within the cylinder abutting the first brush. A third ring shaped cleaning brush having a like outer diameter and a third inner diameter larger than the second inner diameter, is disposed concentrically within the cylinder abutting the second brush and the open end of the cylinder. Each of said brushes having four equidistantly disposed radial slots therein. The slots, of adjacent brushes being aligned and dividing the brushes into four quadrants.

Abstract: A hairbrush more effective for hairbrushing and less injurious to the head skin compared to conventional hairbrushes. This hairbrush has a plurality of tufts of bristles evenly and orderly distributed over the face portion thereof, said tufts each consisting of bristles of three different lengths, said bristles being divided in three rows in a manner that the longest bristles account for the largest numerical portion of the tuft of bristles and the smaller sizes are of a correspondingly lesser amount in accordance with a predetermined proportion. This arrangement thereby makes it possible to obtain the hairbrushing effect described.

Abstract: Vacuum removal means for removing excessive developer material from a member having a latent magnetic image developed with magnetic developer material. The vacuum removal means comprises a chamber having entrance and exit ports of predetermined cross-sectional area such that the ratio of entrance port to exit port is sufficiently small to assure substantially uniform air flow across the entrance port when the chamber is subjected to negative pressure through the exit port. The entrance port of the chamber is in communication with means for subjecting the developed surface of the member to a substantially uniform shearing air flow when the chamber is subjected to the negative pressure. A second entrance port of equal cross-sectional area to the first entrance port may be provided to the chamber in association with gating means for selectively varying the cross-sectional area of each entrance port while maintaining a constant combined cross-sectional area for the entrance ports.

Abstract: A lock for maintaining the pivotal connection between two parts of a pressure-distributing superstructure in a windshield wiper blade assembly in which the pivotal connection is effected by providing a pair of outwardly projecting lugs on the resilient side walls of one of the parts which nest in a pair of aligned openings in the U-shaped end portion of the other of the parts. The parts are assembled by deflecting the side walls of the one part inwardly into an open space in the one part to permit the U-shaped end portions of the other part to be fitted over the lugs. Thereafter, the resiliency of the side walls urges the lugs outwardly into the openings to pivotally connect the two parts. In order to prevent disconnection of the two parts, the lock is inserted into the open space to prevent the side walls of the one part from collapsing into the open space. The lock has enlarged portions to retain the lock within the open space which has been adapted to receive the lock.

Abstract: The invention is concerned with a carpet cleaning implement useful for continuously washing and rinsing a floor fastened carpet in a single operation. The implement includes a head adapted to be rolled along on a carpet upon wheels. The head includes adjacent its bottom a first row of jets for delivering a flow of a solution of a washing composition such as rug shampoo, under pressure, into the carpet. An oscillatory brush is provided near to the first row of jets for vigorously agitating the solution into the carpet. A second row of jets are located near the brush on its other side. The second row of jets serves to deliver a flow of rinse water under pressure into the carpet.

Abstract: A vacuum cleaner nozzle is provided having resilient means, disposed between it and its handle, to prevent displacement of the nozzle from the floor during cleaning and also having a litter collecting brush that is spring biased into floor engaging position and height adjustable so that the nozzle is usable on bare floor and carpeted surfaces. Height adjustment is occasioned by a reciprocal bar having dimpled camming surfaces formed integrally in its top surface, with this bar being lever actuated and including an indicating means to guide the user during cleaning.

Abstract: An annular outer frame mounts the assembly in a vehicle. A pair of pivots rotatably support an inner frame (which mounts a window) for rotation about an offset axis between open and closed positions. The pivots can support a frameless window. One of the pivots has a spring-like arm actuated by manually twisting a handle. The arm grips a pivot stud which locks the inner frame or window in a desired position or by proper setting, the gripping pressure exerted by the arm on the stud can provide for a clutch action.

Abstract: Panel attached guides for tub enclosures and the like having an inclined and unobstructed combined water return and track for sliding panels, the guides having a slotted portion for receiving the lower edge portion of a panel with fastening means for securing the guides to the panel and a second slotted portion for slidably receiving a ledge on the track to permit the sliding movement of the panels in side by side relation. The guides mounted on the panel that is further removed from the ledge than the other panel being provided with a web portion joining the slotted portion of such a width to permit the other panel to slide along the track without obstructing the sliding movement of the further removed panel.

Abstract: A curtain rod assembly manufactured primarily from extruded aluminum components, the curtain rod defining an elongated cruciform groove in its upper portion to receive therein a like shaped support part, a horizontal flange being provided at the rod's lower portion to receive wheeled curtain carriers, the rod being symmetrical about a vertical plane. In a modification of the rod, instead of a vertically elongated cruciform groove, a vertical plate-liked portion is provided wherein such upper vertical portion is fastened through horizontal bolts to an overhead support, a flange on the lower aspect with a horizontal cross piece defining tracks for the wheeled curtain carriers as in the first modification, this second modification also being symmetrical about a vertical plane.

Abstract: A combined track for hanging doors and fascia in which the fascia has an inverted lip that engages a series of clips along the side of the track. The clips, which are integrally formed from the rolled sheet metal of the track, provide slots which are frictionally engaged by the inverted lip of the fascia to secure the fascia in position.

Abstract: A roller is rotatably supported by a roller holder which in turn is supported by a mounting frame so as to be adjustably displaceable downwardly relative to the latter when pressed by an adjusting screw. The adjusting screw includes a flange fixedly mounted thereon just below its slotted head, and the mounting frame has stop means engageable with the flange on the adjusting screw to restrain the latter from movement in its loosening direction.

Abstract: An eaves drain trough is provided which can be manually inverted to facilitate cleaning or servicing. The inverting of the trough is accomplished by means of a hinged bracket comprising an upper harness member pivotably joined to a lower support bracket member. The harness member is constructed so as to enclasp a standard gutter trough in a slideably adjustable manner.

Abstract: A press for separating flesh from bones in which a charge of bones with flesh attached is received in a chamber and a plunger moveable axially in the chamber compresses the bones and flesh to liberate from the bones flesh in the form of a paste which flows through restricted size passages to exit the chamber. Bones retained in the chamber during compression are discharged thereafer through a passage in a cover on the chamber which passage is selectively opened and closed by a valve associated with a cover.

Abstract: The present invention provides an improvement in a fiber drafting assembly which includes an opening roll, the improvement wherein the assembly has a housing member extending about at least a portion of the circumference of the opening roll, the housing member being characterized by having a groove located interiorly thereof.

Abstract: The present disclosure relates to the combination of a clipboard, having a clip of plastic material secured to a board. The clip includes a U-shaped one-piece unitary member having first and second sides and a connecting portion interconnecting the two sides. A mounting wall extends laterally outwardly from the first side of the member and has first and second spaced spring retaining grooves. Wall means has rivets extending therethrough to secure the clip to the mounting surface. First and second spaced spring retaining lugs are formed on the second side of the unitary member on the inside surface thereof and a lifting member is formed on the outside surface of the second side of the unitary member to enable the user of the combination to lift the clip to either place paper underneath or to remove paper therefrom. A torsion spring, within the U-shape, has a tongue secured by the spring retaining lugs.

Abstract: An improved rotary jaw clamping device is disclosed for use with cables, wires and the like which includes means disposed between the rotating jaws of the clamp to adjust the cable-receiving and cable-clamping capability of the clamp to enable its use with cables of varying diameters.

Abstract: A bracelet type fastening device for releasably affixing the ends of a bracelet type item to each other to secure the item on a part of the body of a wearer comprises a first fastening member pivotally affixed to a first end of a bracelet type item and having a semicircular support part of predetermined diameter and a catch pin affixed to the support part and extending diametrically thereacross. A second fastening member is pivotally affixed to a second end of the bracelet type item and has a spherical hook member having a diameter smaller than the predetermined diameter and a slot formed radially therein for accommodating the pin of the first fastening member. The slot extends in a plane inclined at a predetermined angle with a central plane of the second fastening member and opens toward the item.

Abstract: Device for automatically separating two sections of a strap in response to heat or the presence of water comprises a box connected to an end of each section, one end being connected by catch means spring-biased toward its open position, but blocked against movement to the open position by a tablet which disintegrates in response to heat or water.

Abstract: Knitted tubular sweater sections, including a body section and a relatively elastic cuff section, are applied in succession to a spreading frame and are distended to a predetermined, uniform width throughout. The distended sweater sections are then discharged from the spreader frame into a processing section, including a pair of opposed conveyor blankets. In a controlled space interval, between the end of the spreading frame and the line of engagement of the sweater section by the opposed conveyor blankets, controllable width contraction of the sweater section is caused or permitted to occur.Immediately thereafter, the fabric section is engaged by the opposed conveyor blankets, which grip and confine the fabric section lightly over substantially its entire surface area to retain the geometry of the fabric. While thus gripped and confined, the fabric section is steamed, conveyed for a short distance further between the conveyor blankets, and then released.

Abstract: In the method and equipment, the yarn support outer surface is drawn by means of a suitably sized die ring adapted to retain and slide the reeling waste all along the yarn support outer surface and strip the reeling waste therefrom. Suitable cutters operate on reeling waste, before the drawing thereof, in order to reduce the volume of reeling waste to be drawn and stripped.

Abstract: A draw-in gripper assembly for drawing warp threads into weaving components including holding means mounted above one another for holding a plurality of warp threads, fed off of a beam, in place, each individual warp thread forming a loop outside of the clamping point of the upper holding means and being held in position by the lower holding means, draw-in gripper means mounted above the lower holding means, slider head means in the gripper means adapted to clamp a warp thread and pull it from the lower holding means during a draw-in stroke of the gripper means, the warp thread, held in a loop in the upper holding means, being released after a short delay, and, due to the length of thread so released, the warp thread is pulled through eye means of a weaving component, and means for releasing the warp thread from the gripper means at the end of the draw-in stroke.

Abstract: Filaments or filament bundles, which are conveyed by a heated gas, are crimped by treating them in a preheat chamber and crimping them in an elongate chamber from which the heated gas medium issues through longitudinal slits. A stream of cold gas is made to impinge on the outside of the lower one-third of the elongate chamber without allowing significant amounts of this cold gas to enter the said chamber. The resulting filaments or filament bundles have very good dyeing characteristics.

Abstract: A method for texturizing synthetic thermoplastic yarn in a bulking apparatus wherein a heated, dry gas is employed to convey a yarn into a bulking chamber to form a compact mass of yarn. The process is characterized in that an auxiliary gas is introduced into the bulking apparatus at a lower temperature than that of the heating gas to convey the yarn during start-up and/or shutdown of the apparatus to avoid over-heating and fusion of the yarn, and to thereby prevent plugging of the apparatus.

Abstract: This invention discloses a novel safety feature to be used in conjunction with chair controls of tiltable chairs. The chair controls used in the present invention include a biasing means which comprises a horizontal bolt (whose shaft includes a sheath thereon) extending from inside the fixed frame portion through the moveable frame portion of the chair control and marginally beyond, a tension means to create tension in the biasing means and a tension control means adapted to control the tension in the tension means, whereby the biasing means is adapted to return the tilted portion of the chair to a position of rest when the tilting pressure is released.

Abstract: A machine for semi-automatically trimming insulated conductor wires and inserting the trimmed wires into solderless terminals in connectors for effecting solderless conductive termination of the wires therein, with positioning control of the wires during prepositioning beside the connector and subsequent severance and transference into the terminals of the connector, and with a programmer for selective prearranged skipping of terminals. The machine is capable of effecting such terminations in a variety of connectors.

Abstract: In making useful and decorative articles such as Christmas tree ornaments, ash trays, candle holders, napkin holders, artificial flowers, toys and the like from aluminum cans, first the top or bottom portion of the can is cut off, then a predetermined number of holes of predetermined size and spacing are punched about the outer wall of the can, then the outer wall of the can is cut between the holes in order to form a predetermined number of strips of uniform width, the cut strips are bent to an arcuate shape and fastened together and/or, depending on the article being made, fastened to either the end wall or side wall of the can. In making certain articles, the top or bottom portion of a second can is cut off, then the outer wall of the can is marked and cut into strips and the strips are fastened together. The first can may be fastened to the second can.

Abstract: A method of connecting beams having an H-shaped section to a column having an H-shaped section of a steel frame construction with upper and lower flange fittings. The flange fitting comprises a substantially rectangular base plate to be connected to the column having centrally a continuous thicker portion from which the base plate is tapered toward opposite ends of the base plate, a supporting plate projecting from the thicker portion for supporting a flange of the beam and a reinforcement on the base plate forming a T-shaped portion with the supporting plate. First the supporting plate of the upper flange fitting is secured to one end of an upper flange of the beam in end-to-end relationship and the base plate of the lower flange fitting is bolted in position to the column.

Abstract: Method of producing plates having an identical configuration of valleys and lugs thereon so that one plate is interchangeable with another. Flat plates are provided with a pair of individual holes at opposite ends of the plate center line. Thereafter one or more valleys are machined in a predetermined spacing and location from one or both of the locating holes, and the process repeated for a plurality of plates. Lugs are produced by matching one plate with another by means of pins inserted into the locating holes, and injecting a hardenable material into the valleys. This hardenable material is bonded to the opposite plate. The machining operation of the valleys is carried out in a manner to produce randomly spaced ridges along the side surfaces of the valleys which form depressions in the side surfaces of the lugs that are cast therefrom. Molds made from the respective pattern plates have valleys with ridges therein which have an interference fit with respect to lugs of a matching mold.