Abstract: A method of preparing carbon articles including the steps of mixing binder and carbon aggregate, forming the resulting mixture into an article, measuring the slump of the article at least to hundredths of an inch following the forming and prior to baking, and, if necessary, changing the relative proportions of binder and carbon aggregate in subsequent executions of the mixing step to yield a target amount of slump.

Abstract: Proposed in this specification is a method for fixing a multitude of blades or vanes onto inner concaved surface of an outer shell of a turbine wheel for a fluid or hydrodynamic coupling made by sheet metal stamping, in which a plurality of slots, each having a size sufficient to receive in it a projected part of each blade, are formed by means of an array of punches held on a die in the inner concaved surface of the outer shell of the turbine wheel at an equal space interval provided between adjacent slots, and in an arrangement of a plurality of concentric rings, then the projections provided on each blade are fitted into the slots in a manner to cause the blade to extend in the radial direction from the center of the concentric rings of the arrays of the slots, and finally one of the edge portion of each slot is staked or caulked by means of the array of punches which have been shifted for a thickness of the blade so as to cause one of the side surfaces of each of the projections on each blade to be urged

Abstract: An elastomeric radial lip shaft seal and method of making same wherein the seal is provided with a rigid reinforcing member of generally cylindrical shape and formed from strip stock with the ends thereof joined by clinch-butt construction.

Abstract: A method for the production of a cylinder lock with a fixed cylinder housing, a turnable cylinder therein and a number of locking discs turnable by the key of the lock; a locking bar operable in the radial direction by the locking discs locks the cylinder to the cylinder housing. The method provides the lock cylinder with locking discs without peripheral recesses allowing the opening of the lock; the locking discs are turned with a key member into an opening position defined by the key member; and a joint groove corresponding to the form of the locking bar is machined into the set of locking discs at the position of the locking bar. Each of the locking discs is provided at the right position with a peripheral recess allowing the opening of the lock. The operation can be repeated with other key members for providing the lock mechanism with a desired number of opening combinations usuable in mastered locking systems.

Abstract: A method of supporting a metal tank having a circular horizontal section which comprises providing the tank with a horizontal ring-like portion having a substantially upright surface, forming a metal substantially upright skirt having a top portion with an internal surface which matches the tank ring-like surface and which has an internal diameter at ambient temperature at matching locations slightly less than the diameter of the tank ring-like surface at ambient temperature, heating the skirt top portion, or cooling the tank ring-like surface, or both until the internal diameter of the skirt top portion is larger than the diameter of the tank ring-like surface, positioning the skirt top portion around the tank ring-like surface, bringing the skirt top portion or the tank ring-like surface or both to ambient temperature to thereby shrink-fit them together, and joining the skirt top portion to the tank by welds, bolts or rivets.

Abstract: Treatment of a steel well pipe connection involves use of an electrical coil and a cylindrical sleeve carrying the coil, and includes the steps:(a) relatively applying the sleeve to a position about the pipe connection so that the coil extends about the connection, and(b) passing electrical current through the coil to effect induction heating of the connection to temperatures within a range of between about 75.degree. F and 500.degree. F, and(c) relatively removing the sleeve from said position.

Abstract: A rigid and an axially movable tool for squeeze forming a rivet, each having a facing resilient member to contact a part to be riveted, to center the rivet between the clamping tools, and to float the part to be riveted to symmetrically form the rivet.

Abstract: An integrated system for fabricating the wall section for a building. The wall section includes a framework composed of plural studs disposed in a parallel array between an opposed pair of plates and has sheathing secured over the framework. The system comprises a first workstation including a frame for supporting the studs and a frame for supporting the plates in abutment with the ends of the studs. Automatic nailing means are supported on a carriage which is movable along the frame and is operative to nail the abutting stud and plate portions together. Portions of the frame means are retractable to enable a conveyor to move the framework, once assembled, to a second workstation. The first workstation also includes cutting means mounted on a carriage for cutting off excess end portions from the opposed plates extending beyond the most upstream stud of the wall section. The second workstation includes a conveyor for receipt of the assembled framework.

Abstract: Apparatus for use in sorting a succession of articles which are moving along a path, the apparatus comprising: a plurality of receiving devices arrangeable to move adjacent to the succession of articles travelling along the path, so that over at least a part of the path each article moves in unison with one of the receiving devices; means for transferring each article to a receiving device as it moves in unison with the article, and a plurality of delivery stations past which the receiving devices travel, each receiving device being operable to feed an article which it has received to any one of the delivery stations as the receiving device passes the delivery station.

Abstract: A method of manufacturing charge transfer devices in which an asymmetrical potential well in the direction of charge transfer is formed by the shape of narrower portions of a transfer channel which is bordered by highly doped channel stoppers. Impurities are diffused through a first mask into a polycrystalline silicon layer on the surface of a semiconductor substrate to construct transfer electrodes of highly doped polycrystalline layer. Then impurities are diffused into a semiconductor substrate through openings bordering on one edge with a first mask to form the highly doped portions to make the narrower portions of the transfer channel to assure that the edges of the transfer electrode and the edge of the narrower portion are aligned.

Abstract: A transducer diaphragm comprising a diaphragm plate with a predetermined pattern of recesses and mesas formed by a chemical etching method to change and/or isolate the expansion and contraction areas of the plate under pressure. In the illustrated embodiment, the pattern includes a central depression on the rearward face including peripheral cutouts extending outwardly from the central depression to receive a strain gauge, thereby positioning the location of the maximum compression amplitude of the diaphragm to be under the gauge.

Abstract: A bus bar of laminar construction useful for power distribution systems and the like is disclosed with a method of fabricating the bus bar and installing suitably provided contact pins or posts. The method comprises stacking conductive plates and dielectric plates alternatively, encapsulating the conductive and dielectric plates in a solidifiable dielectric medium, drilling apertures through the medium and specified conductive plates, driving the pins and an amount of solidifiable material provided therewith into the apertures and into contact with the conductive plates, and solidifying the solidifiable material to secure the pins in the apertures.

Abstract: A pressing tool for electrical connectors, or the like, including an elongated housing, an anvil carried by the housing adjacent one end thereof, a presser carried by and movable relative to the housing toward and away from the anvil along a presser path perpendicular to the anvil, an elongated handle extending longitudinally of the housing and accessible from the exterior thereof, means connecting the handle to the housing for producing longitudinal movement of the handle relative to the housing in response to lateral movement of the handle relative to the housing, and means for converting such longitudinal movement of the handle relative to the housing into movement of the presser along the presser path toward the anvil. Reversed movement of the handle is prevented until the presser has been moved a predetermined distance toward the anvil.

Abstract: A comb assembly for an electric dry shaver is provided with a perforated central comb panel and two end comb panels disposed adjacent the edges of the central comb panel and having long hair slots. The end panels and the central comb panels are separately fabricated from stock materials of different predetermined thicknesses and assembled to form an accurate and smoothly interfitting comb assembly. Thus, the thickness of the central comb panel is determined independent of the end comb panel thickness. The central comb panel, fabricated from a stock material of a uniformly thinner thickness than that of the end panels, requires no grinding in the fabrication of the comb and thus results in a more uniform thinner comb than obtained with grinding operations.

Abstract: An electric dry shaver comprising a part-cylindrical cutting foil, an inner cutter provided with arcuate cutting edges which cooperate with said foil, and drive means to drive said inner cutter in linear reciprocation parallel to the axis of said part-cylindrical foil. The drive means includes a part-spherical driver head articulated to said inner cutter at a center of articulation substantially coincident with the center of gravity of said inner cutter and the center of application of the resultant of the frictional forces acting between said inner cutter and said foil during reciprocation of said inner cutter by said drive means is substantially coincident with said center of articulation and with said center of gravity.

Abstract: An internal pipe cutter of simplified construction allows easy conversion from a large-diameter pipe cutting configuration to a small-diameter pipe cutting configuration. An arm carrying a pressure roller assembly is pivoted to a body part carrying a rotatable cutter. The pressure roller assembly is pivotable from one side of the arm to the other for accommodating different pipe sizes. The body is adjustably mounted in a support member carrying a diameter adjusting screw, a depth adjusting set screw and a handle.

Abstract: A folding knife has a blade and a pair of overlying scales all mounted on a pivot post. A lock pin and lock hole on the scales retain them in registry for blade use or storage. A stud on one scale engages a semi-circular slot in the blade and swings it to an extended position during a full turn of the scale around the pivot post, and a corresponding turn in the reverse direction retracts the blade. A blade guard between the scales serves as a stop or abutment for two different parts of the tange of the blade to limit extension and retraction. Spring means are built into the pivot post to yieldingly press the lock pin into the lock hole to prevent unintentional movement.

Abstract: An improved tool, such as a scissors, shears and the like, and an improved method of making such a tool is disclosed. The improved tool comprises two cooperating members that are interconnected so as to be pivotally movable, with respect to each other and about a connection point, between an open position and a closed position. The members each have a handle at their one end, a shank portion disposed between its handle and the connection point, and a blade portion disposed between the connection point and their other end. Each of the shank portions of the members have an inside face and an outside face, and each of the blade portions of the members have an inside face, an outside face and a cutting edge extending from adjacent to the connection point and to the other end of the member.During the practice of the improved method, the outside face of the shank portion of one of the members is punched so that a bearing dimple is formed on the inside face of this shank portion.

Abstract: A slitting device for subdividing longitudinally a ribbon wherein blades are mounted in a housing in positions to slit into two or more narrow strips a ribbon which is pushed endwise into a selected slot in the holder.

Abstract: One form of artificial modular denture, and the method of producing same, includes an assembly of hard prosthetic teeth permanently secured to a U-shaped hard base structure with a terminus of the hard base structure disposed a short distance rearwardly of the incisor areas of the assembly of the prosthetic teeth, with a palatal vault member adapted to substantially conform with the palatal vault area of the patient's mouth being fitted with the artificial denture. The palatal vault member being selected from a set of palatal vault members having differently contoured configurations, and retaining means is provided for individually releasably connecting the palatal vault members to the assembly so as to permit the selection of the most suitably fitting one of the set of palatal vault members for use as part of the artificial denture.

Abstract: A motor driven plotter has a plotting head which is translated in two coordinate directions over the work surface of a plotting table. The plotting head is mounted on a first carriage which moves in one coordinate direction and a second carriage is mounted on the first for movement in the second coordinate direction. The limits of both carriages in each coordinate direction are directed by means of a pull cord suspended in a rectangular pattern from the first carriage. A cord portion or segment is intersected and extended by a contact at each limit of travel in the coordinate directions. A switch connected to the cord produces a limit signal when the cord is extended.

Abstract: Apparatus for measuring a workpiece which includes a support structure for carrying a longitudinally displaceable guide carriage, which guide carriage in turn carries a measuring feeler. To accommodate precise measurement of relatively large objects, without the requirement of an excessively large and heavy single support structure for the longitudinally displaceable guide carriage, the support structure is formed of a plurality of identical support elements. Each of the support elements are provided at the respective opposite end plates with mounting pins and recesses interengagable in a force form-fitting manner so as to align and connect the support elements in a precise location relative to one another. The end plates of the support elements are provided with grooved bracket structure to accommodate passage of the carriage past the junction of two support elements.

Abstract: The invention comprises a linear proportioning device and method of using same to quickly and accurately calculate the shim thickness necessary to bring the shaft axis of a motor parallel to that of a pump to be driven, and then vertically adjust the axis of the motor until it is co-axial with that of the pump.

Abstract: A conventional butt hinge including a pair of first and second relatively swingable superposed hinge leaves is provided and the leaves include registered sets of apertures formed therethrough with the adjacent ends of registered apertures being countersunk. A thick backing plate overlies the side of the first leaf remote from the second leaf and is provided with threaded bores aligned with the registered apertures formed in the leaves. Threaded studs are threadedly engaged in the threaded bores with one set of corresponding ends of the studs flush with the side of the backing plate remote from the hinge and the other set of ends of the threaded studs are sharpened and project outwardly from the ends of the apertures opening outwardly of the side of the second leaf remote from the first leaf. Threaded nuts having rounded opposite ends are threaded onto the studs between the hinge leaves and are received in the countersunk ends of the registered apertures.

Abstract: A multiple vial universal flange level assembly for leveling and squaring the flange of a pipe section having a preassembled or subsequently assembled flanged end, including an elongated bar-like main frame having first and second bubble vials oriented to indicate when the main frame is oriented horizontally both transverse and parallel to the pipe section axis and third and fourth bubble vials for indicating when the main frame longitudinal axis is in a vertical plane when non-horizontal, together with first and second pairs of centering cones and a pair of associated rods insertable into apertures of the flange for removably assembling the main frame onto the flange.

Abstract: A slope analyzer is provided for attachment to an earth-working vehicle to provide the operator with a direct readout when a selected slope has been attained during the grading operation. An indicator arm is pivotally mounted on a base and movable to a selected slope ratio indicia. Slopes wherein the uphill side of the vehicle is either on the left or the right may be accurately monitored. A curved spring strip forms a preferred retaining means for the arm and a spirit level provides the desired simple readout for the device.

Abstract: A strip which will form a rigid shoe stiffener, such as a shoe shank, is applied to the surface of a shoe to be stiffened, such as to the bottom of an insole. The shank strip is flexible and includes a carrier sleeve or envelope containing a plurality of fiberglass strands in a thermosetting plastic matrix. After the shank strip is in place on the insole, the matrix is activated by exposing it to an external stimulus such as radiant heat which is applied locally to the shank strip. Curing takes place in situ on the insole bottom. The carrier sleeve is formed in a manner which provides control over the shape of the cured stiffener as well as a means to facilitate handling of the shank strip.

Abstract: Footwear having an inner sole formed of a resilient material with an upper surface contoured to provide a comfortable foot-supporting surface. The inner sole has an arch support region, a depressed heel cup region, a metatarsal support region, and in one embodiment, a curved low toe ridge which defines the toe region from the metatarsal support region and which extends transversely across the sole under the first phalanx of each of the toes. The insole is supported on an outer sole which has a plurality of upwardly extending ridges providing cushioning with various firmness in the different regions of the sole to compensate for the weight distribution of the foot. The inner sole and footwear upper are arranged to securely cradle the foot of the wearer.

Abstract: A ski boot having an ankle cuff which is movable relative to a lower shell about a transverse axis or the like which is provided at approximately ankle height on the ski boot. A support member is provided which cooperates with structure on the ski to limit the forward and/or the rearward movement of the ankle cuff relative to the lower shell. Generally, the support member cooperates between the ankle cuff and a component of the ski binding effecting securement of the ski boot to the ski. The components of the support member can be separate from the ski boot construction, namely part of the ski binding components or the support member can be an integral part of the ski boot construction having structure thereon which cooperates with an element fixedly secured to the ski.

Abstract: Dredging apparatus has a bucket ladder pivotally mounted thereon for vertical swinging movement about a horizontal axis. To stabilize the bucket ladder, the free end of the ladder is supported by a pulley and cable assembly which at its upper end is supported from the free arm of a lever pivotally mounted on the pontoon of the dredging apparatus. A hydro-pneumatic or pneumatic spring is pivotally mounted at one end on the pontoon and mounted for pivotal and sliding movement on and along a downwardly concave path on the lever at its other end, thereby to vary the point of application and hence the magnitude and direction of the spring force on the lever.

Abstract: A lift adapter apparatus by which one of a plurality of digging buckets can be attached to one of a plurality of backhoe machines comprising an upper and lower bushing and pin assembly attached to spaced lifting ears located on the bucket. The bushings are attached to the ears and receive the pin therethrough so that the dipper receptacle and the curl cylinder receptacle can be attached in journaled relation to a medial length of the exposed upper and lower pins. The width of the bushings and the pin diameter can be selected to enable any one bucket to become operatively attached to any compatible size backhoe machine.

Abstract: A carriage assembly has first and second pairs of rollers rotatably connected to first and second sides of the carriage. First and second rail means are secured to spaced parallel sidewalls. The first rail device has first and second elongate rails positioned in end-to-end relationship at which the adjacent ends are spaced one from the other. Each of the first pair of rollers are rollably carried by respective first and second rails while the second pair of rollers are rollably carried by the second rail device.

Abstract: A work control center system which incorporates a planar member formed of a porous resilient material adapted for mounting of sheet material through insert of tack members. The planar member includes classification elements where the materials being mounted may be classified into distinct topic areas. Additionally, the work control center system has a plurality of receptacles which are structurally adapted to contain various utensils, work material and monies. One of the receptacles is generally cup shaped in contour and is specifically adapted for insert of the hand of a user in order that small elements such as coins may be easily inserted and retracted. The work control center system further includes hook members mounted on a lower surface thereof for mounting of other types of sheet materials such as calendars.

Abstract: Diffused light is projected onto a supported thin film in the form of a truncated sphere. The device has a light source disposed at the bottom end of a housing constructed of a light shielding material, and a diffuser plate at the top end of the housing to emit light into the truncated sphere. In one embodiment the plate carries a layer of liquid soap from which a bubble is blown. The housing may also carry a clear glass dome over its top end adjacent which the thin film is supported. Decorative interference patterns of luxuriant colors result.

Abstract: A self-erecting sign post has a rigid but frangible section along its length at its lower end and a coextensive helical spring circumjacent the rigid section and interconnecting the separated post portions, the assembly being such that the frangible section constitutes a zone of weakness which will break before the remainder of the sign post bends upon impact, the spring being operative to restore the sign post to its erect position until the frangible section can be replaced.

Abstract: A device is disclosed for guiding rifle cartridge cases during the loading and ejecting processes, thereby facilitating the two processes.

Abstract: In a typical XIX Century revolver of the type comprising a hammer and a cylinder supported for rotation about a shaft having a predetermined axial position in said frame, a cylinder shaft rearwardly projecting out through said frame and towards said hammer, said shaft and said hammer having an extension and respectively a recess not symmetrical relatively to the revolver symmetry plane, whereby when said shaft is rotated in a first rotational position the said extension abuts on a not recessed part of the hammer, the said hammer is prevented from reaching the firing position, and when the shaft is rotated in another rotational position wherein said extension freely enters in said recess the revolver can be fired.

Abstract: A safety device for rifles that will hold the breechblock thereof in a locked, open position, after firing, for so long as the firing pressure on the trigger is maintained. The safety device also utilizes the rifle safety actuator to hold the breechblock in its locked open position when the actuator is in its "safe" position or to release the breechblock after the rifle safety actuator has been placed in its "fire" position and the trigger pressure has been released. Normal operation of the rifle safety actuator is not affected.

Abstract: A device for loading cartridges into the chambers of a revolver has a plate against which the bases of the cartridges are placed, a set of detents arranged around the plate to hold rims on each of the cartridge bases, and a spring for urging the detents and rims against one another to hold the cartridges in place. The set of detents can be rotated so that they release the cartridges, and when this happens, the cartridges are pushed axially into the revolver chambers by the spring. A locking device can hold the cartridges and detents in engagement, and this locking can be released automatically as the cartridges are introduced into the chambers of the revolver.

Abstract: In an embodiment shown, the invention comprises a dual-chambered housing which has a spring clip integral therewith for replaceably clasping the housing atop a fishing rod. One of the chambers replaceably receives a battery and a light bulb, the two substantially comprising a classic flashlight assembly, in which the bulb has its base in contacting engagement with a center-end terminal of the battery and its filament globe exposed externally of the one chamber. The threaded bonnet or shank of the bulb is received in a metal disc to which is connected a first electrical lead. The first lead is passed therefrom and into the other of the two chambers. The other chamber also receives one end of a second electrical lead which also passes therefrom into the one chamber for contacting engagement with the other-polarity end of the battery. within the other chamber, the ends of the leads are spaced apart to define an interruption in the "flashlight assembly" circuit.

Abstract: A portable fishing rod storage and support apparatus generally comprised of a hinged, two-piece foldable support platform having clip members connected thereto for removably holding a fishing rod and reel assembly. In one mode, the two-piece support platform may be placed in an unfolded, planar position and suspended from a wall for storing or displaying a multi-section fishing rod and reel assembly. In another mode, the two-piece support platform may be placed in a folded, angular position and anchored to the ground via staking assemblies, along side a body of water, for holding an assembled fishing rod and reel assembly at a predetermined angle in relation to the water. A locking brace is connected between the two pieces forming the support platform for selectively adjusting and maintaining a desired support angle.

Abstract: A protector for covering the front face of a "plug-cut herring" to maintain the front face of the plug at a predetermined angle. The protector is basically a cap having a planar face and a cylindrical wall adapted to extend rearwardly along the sides of the herring when the inside surface of the cap member abuts the front face of the herring. A pair of spaced apart apertures are formed in the face of the cover for allowing a leader terminating in a pair of hooks to extend through the cover. The speed at which the herring oscillates as it is towed through the water is determined by which of the two apertures the leader passes. The plug-cut herring protector may be formed of a wide variety of materials and colors and it may be fabricated in a variety of sizes to accommodate a wide range of plug sizes.

Abstract: A reel holder for fishing rods comprising inner and outer concentric tubular elements for locking the reel holder to a rod and a separate reel-locking mechanism provided on the outer tubular element. Each end of the inner tubular element is slotted and formed with a raised flange. The outer tubular element is slidably positioned between the raised flanges of the inner element and has a threaded end bearing a nut which has one end extending beyond the threaded end. The raised flanges of the inner tubular element, the opposite end of the outer tubular element and the one end of the nut are so contoured that when the reel holder is positioned on a rod and the nut is partially unscrewed, the outer tubular element and nut bear against the raised flanges to cause the opposite ends of the inner tubular element to simultaneously grip the rod.

Abstract: A fishing lure comprising an elongated hollow tube which holds a supply of water-soluble scented bait for attracting fish. The tube is rotatably mounted about an elongated coaxial spinner shaft which protrudes outward from both ends of the tube. The tube is free to rotate relative to the shaft. Axial flow of water is achieved through the tube for release of soluble bait material while fishing.

Abstract: A fishing lure in the form of a spinner bait having two wires supporting two spinner blades in alignment with a hook. In one embodiment, two wires extend from the head of the bait and are attached to the eye of the hook inside the head. Each wire includes a laterally extending portion in alignment with the hook and in alignment with each other for supporting a pair of spinner blades. The wires are secured together by a coil spring or other structure with the longer of the two wires having an attaching eye formed thereon for connection with a fishing line. In other embodiments, the two wires are connected to each other or associated with the head in various ways to retain alignment of the blades and hook. The two blades provide a lure which will run true and straight and reduce the tendency of spinner bait from rolling over or varying to the right or left.

Abstract: An animal trap having two similar frames each having jaw forming sides and ends extending between the sides to support the jaws. The ends have a central portion in which the frames are pivotally engaged through adjacent ends for rotation about a common axis between set and closed positions and outer portions on each side of the central portion of the jaws. At least one actuator capable of rapidly and forcefully effecting the rotation is present. The actuator has two arms spring biased at one end so that the other ends, which terminate in rings encircling adjacent ends of both frames on opposite sides of the axis would, if unobstructed, move apart to a distance substantially greater than the length of the frame ends. There are trigger means for releasably maintaining the trap in set position.

Abstract: An insect trap is in the form of a hollow polygonal body with an insect-attracting insecticide applied to an inner surface. One or more holes in a downward facing submedial surface of the trap allow insects to enter the trap interior. The trap self-deploys from a single scored planar sheet due to force applied by resilient means secured to positions on the planar sheet corresponding to separate surfaces of the polygonal body.

Abstract: A base supports a chamber having an upper portion that defines an air exit aperture, a middle portion that has a plurality of air entry apertures and a closed, lower portion that forms a soap solution reservoir. An apertured, bubble forming ring is mounted within the chamber for rotation about a horizontal axis and has its lower portion extending into the soap solution reservoir. An air impeller is mounted within the bubble forming ring for rotation about a vertical axis. When the toy is actuated, the apertured bubble forming ring carries films of soap solution from the reservoir into the upward air current emitted by the air impeller to form a multitude of upwardly projected bubbles.

Abstract: A line-controlled, centrifugal fan, jet-propelled model airplane is disclosed in which the impeller of a fan contained within the fuselage of the aircraft is driven from a remote drive unit by an elongated flexible cable contained within a flexible sheath. The impeller rotates about an axis perpendicular to the longitudinal axis of the airplane and is driven in a direction of rotation tending to rotate the airplane about its lateral axis in a nose-up direction, due to the frictional contact of the compressed air between the rotating impeller and the housing of the centrifugal fan mounted within the fuselage. This abstract is not to be construed in any way to define or limit the invention set forth below.

Abstract: In a safety mechanism for highway exit ramp, dual motions are provided in the structural operation of the mechanism wherein a warning member, such as a length of barrier or semaphore, is pivotally mounted between an upright position and into a horizontal and cautioning disposition across the roadway, but in addition, the warning member itself is horizontally pivotal in the event that a moving vehicle should strike the same. The mechanism includes a detection member, such as either a protruding device capable of being pivoted by the vehicle passing thereover, or an electronic detecting device as provided in the roadbed of the ramp and when encountered by a vehicle travelling in the wrong direction disengages a detent that releases a spring mounted rack that turns its pinion for pivoting the warning device across the roadway.