Abstract: Rifling in a gunbarrel accelerates in spiral from a relatively bore-parallel beginning and has a groove surface which in cross-section progressively rotates concurrently with the acceleration in spiral starting from a circumferential shape bounding rectangular lands to an incline merging with the top of a land one side of each groove and deepening the leading edge of a land on the other side of each groove.

Abstract: A humane animal trap includes a casing defined by upper and lower box-like sections, which are hingedly interconnected for telescoping together to a set position; springs biasing such sections apart to a sprung position; a latch mechanism for holding the upper and lower sections together in the set position; a pair of jaws hingedly mounted in the top of the upper section and connected to a trigger which is actuated by one of the jaws when an animal steps on the jaws for causing the latch mechanism to release the upper section, whereby the upper section moves upwardly relative to the lower section and the leg of the animal moves downwardly between the jaws; springs biasing the jaws to the closed position where resilient opposed edges of the jaws retain the leg of the animal without damaging the leg; and gates which slide partly together above the jaws when the trap is sprung to limit access to such jaws, whereby once trapped an animal cannot readily gain access to the jaws and escape.

Abstract: A trap anchoring stake for anchoring an animal trap in soft or loose soils where in the past excessive stake length has been required to keep the trapped animal from pulling out the stake. The stake has a spring arm connected to the bottom of the stake for outward pivoted movement, and adapted to retain the stake in the ground by lateral pressure on surrounding soil, or by lateral penetration of the top end of the spring arm into the soil, or both. A spring arm latch is provided for connection to a trap tether chain operable to automatically release the latch by movement of a trapped animal, in case the trapper forgets to release the spring arm. An abutment limits outward movement of the spring arm to an acute angle to the stake, and the arm and stake constitute obstruction means which will hang up on brush or the like if the trapped animal succeeds in pulling the stake out of the ground.

Abstract: The toy movie camera of the present invention comprises a housing having aligned viewing apertures in opposite wall portions separated by a manually rotatable opaque disc having one or more slots or apertures therein capable of being aligned with the housing viewing apertures, periodically and controllably, by manual rotation of the disc within the housing. A click sounder is also included for producing a click sound only when the disc aperture is approximately in alignment with the housing viewing apertures. The click sounder includes a spring biased strip to be intermittently contacted by a pin mounted on an axle and rotated with the disc. The disc aperture is located relative to the pin position and to be out of alignment with the housing viewing apertures when the pin is biased by the spring biased strip.

Abstract: A toy comprising a hollow member and a rod for operating the hollow member. The hollow member has an opening at one of two ends thereof, a smooth circular boundary edge at said one end at the inside of the opening, a spherical rotationally symmetrical surface on its outside at its other end, the axis of symmetry of said surface being coaxial relative to the upper smooth circular boundary edge. Furthermore the toy has a circular annular guide surface disposed within the hollow member adjacent said other end thereof, said guide surface being coaxial with respect to said axis. The toy might have a flange-like edge portion and vanes which extend radially and which are inclined relative to a plane extending normal to an axis of rotation of the member.

Abstract: A toy which can repetitively move with respect to the medium supporting it has a toy body with at least one appendage movably mounted to the body. A portion of that appendage is exposed from the body and is positioned to contact the supporting medium. A mechanism within the body is operatively connected to the appendage for moving the appendage such that the portion of the appendage exposed from the body can move in a first direction at one velocity and a second direction at a different velocity. A portion of the mechanism moves with rotary motion which is transferred by another portion of the mechanism to cause still a further portion of the mechanism to move with linear motion. The portion of the mechanism moving with linear motion is operatively connected to the appendage to move the appendage.

Abstract: An infestation of Peronosporales on plant leaves will only fully develop if the leaves experience a period of wetness of a duration sufficient to allow the penetration of zoospores into the stomata of the leaves. The duration of this period is temperature dependent. Apparatus is provided which includes a pulse generator arranged to generate pulses at a rate dependent on the ambient temperature, a signal gate controlled by a leaf wetness sensor to pass the pulses output from the generator only when the leaves are sufficiently wet to favor penetration of the zoospores, and a counter arranged to count the pulses passed by the gate to time a period the duration of which varies with temperature. Upon completion of timing, the counter outputs an infestation signal which causes a monitor counter to start counting the pulses output from the pulse generator whereby to provide an indication of the subsequent advance of the infestation.

Abstract: Two or more fiberglass preformed sections interfit to form a cover about the base of a tree. The sections are provided with a series of underlying rings spaced apart concentrically radially outward from a central opening through which the tree extends. The rings provide reinforcement to each section and function as guides for subsequent cutting of larger holes as the tree grows. When concrete or the like is to be poured about the tree, a framework is used as a concrete form to insure the cover sections fit together properly.

Abstract: A tree medication capsule is disclosed as including a vial having a medication sealed therein by means of an end cap; the vial, medication and end cap constitute a self-contained unit which is inserted into a predrilled hole in a tree. The vial is made of frangible material so that upon breaking, as by a mallet tap on the end cap, the medication is free to escape into the tree.

Abstract: The planter comprises a container for soil having a bottom wall with an aperture, a base having a top wall with an aperture, a tubular member having a liquid tight connection with said walls surrounding said apertures holding said walls in spaced axial alignment, a foraminous support ring connected to said top wall within said base surrounding the aperture, a soil retaining closure for the lower end of said support ring, a transparent water receptacle in said base having a liquid tight, removable connection therewith, thereby forming a water reservoir of substantial volume, and a sight opening in said base below the liquid tight connection for viewing the contents of the receptacle. The container, base and tubular member are a unitary, injection molded, opaque plastic article of attractive color and finish. In use the container and tubular member are filled with soil in which seeds, cuttings, transplants and the like can be planted and watered.

Abstract: An apparatus for locking a door leaf comprising a turnable shaft secured to the door by an arm to drive the door in opening and closing movements under the action of a piston-drive which produces slight axial movement of the shaft as the door approaches the closed position. A first locking element is fixed to the door frame and a second locking element is fixed to the door, the locking elements having wedge-shaped noses which interengage and lock the locking elements when the door is closed and the shaft is lifted. The locking element on the door frame includes an axial extension overlapping the nose of the locking element on the door to form an abutment to limit the degree of angular closure of the door. The axial extension can carry a friction-reducing insert to facilitate relative movement between the noses when the door is lifted at the end of the closure movement.

Abstract: A door frame kit comprises two stiles, a threshold member, and a lintel member, each stile preferably being engageable with said members irrespective of which end of the stile is uppermost. Each stile has a pair of flanges at at least one end. Each flange, which has a transverse projection, is insertable through a corresponding longitudinal opening in said one member, the stile and said one member abutting when the flange is so inserted. The other end of each stile is securable to the other member to complete a door frame.

Abstract: The barrels orbit to create a centrifugal force on the barrel contents while the barrels are concurrently rotating about internal axes counter to the orbital movement, utilizing endless members to impart both the orbital and counter rotating movement to a plurality of the barrels.

Abstract: A cylindrical grinding machine comprising a slidable wheelhead assembly, a slide bed having ways supporting the wheelhead assembly, including means to prevent horizontal deviation of the wheelhead along the ways, and precision displacement means to slide the wheelhead assembly along the ways including, rotatable ball screw means axially secured to the slide bed, means to rotate the ball screw comprising a stepping motor, and nut housing means for coupling the nut means to the wheelhead assembly so that rotation of the ball screw slidably displaces the wheelhead assembly along the ways, the nut housing means including a medial flexible portion comprising two horizontal parallel plate portions having selectively configured transverse grooves so that vertical radial strain on the ball screw attributable to the wheelhead assembly is minimized.

Abstract: A pressure-relieving facade structure for a building has a plurality of slab-like elements, a plurality of retaining legs each extending from one of the slab-like elements toward the facade of the building and having a thickened clamping projection at its free end, and a plurality of elastic receiving elements attached to the facade of the building and releasably receiving the clamping projections of the retaining legs with elastic clamping action.

Abstract: An improved flat-like assembly of gutter cover parts is utilized to cover open storm gutters as are commonly used on buildings, and the assembly thereof includes improved means for attachment to the gutters, improved quick connection/disconnection of separable sections thereof, and is further provided with a heater element to be made electrically conductive to precipitate the melting of accumulating ice and snow.

Abstract: A floor plate assembly, particularly suitable for use in and around rolling mills, comprises a closure floor plate which is arranged to close an opening adjacent another floor plate. The closure floor plate can move as required between a first position closing the opening and a second position under the other floor plate. The other floor plate is movable during the opening and closing operation to avoid obstruction of the closure floor plate.

Abstract: Interconnecting members are provided for building up geodesic dome-like structures. In a first embodiment, there are provided strut members forming the edges of triangles utilized in the geodesic dome structure and gusset members provided at the vertices of the various formed triangles interconnecting with the ends of the strut members. The ends of the strut members and the gusset members are provided with cooperating integrally formed lip and recess portions arranged to be interlocked together, elastic resiliency of portions of the gusset member being provided to both enable the members to lie at an angle to each other and to be held in their interlocked relationship.

Abstract: An automated assembly, maintenance, and repair system for the construction of a large space structure. The space structure comprises a plurality of trusses and truss junctions that in turn are made up of a plurality of individual struts and nodes. The truss assemblies are progressively built by an assembler trolley as the trolley crawls along the constructed truss. The trolley comprises a forward crawler and a rear crawler joined by an articulated coupler. The crawlers are carried along the structure by belt transports incorporating grippers that engage the truss structure at the nodes. Manipulator arms for strut and node assembly are located on the forward crawler, and the majority of control, power, and communication systems are located in the rear crawler. Cargo canisters filled with component parts for constructing the space structure are carried by the forward crawler. The space structure configuration is determined by the arrangement of the individual struts and nodes during the assembly process.

Abstract: A structural member such as a beam formed by an inner layer of fiberglass that is filament wound about a mandrel, a middle layer of fire retardant material such as gypsum board, and an outer layer of filament wound fiberglass. In addition to its fire retardant function, the middle layer acts as a spacer between the inner and outer layers, thereby rigidifying the beam. Tendons extend throughout the length of the beam internally. They are connected to the top of the beam near its ends and to the bottom of the beam at one or more intermediate points, thus tending to lift the middle of the beam to prevent sagging. The tension on these tendons may be selected to meet any of a variety of load conditions.

Abstract: In the pouring of concrete for building floors and walls having steel reinforcements over an area to be poured and a series of parallel spaced rows of longitudinally spaced upright dowel bars extending over the area, the method of protecting workers from impalement and injury due to a fall onto the bars consists of providing a series of downwardly facing dowel guard channels having depending support pipes and selectively positioning channels over a series of dowel bars in each row and assemblying the respective pipes over and upon the dowel bars of each row, the rows of channels being co-planer for forming a protective cover over the dowel bars. The safety dowel guard includes a downwardly facing channel and a series of longitudinally spaced support pipes within each channel, at one end secured thereto and with their other ends depending below the channels adapted to telescope over a corresponding series of dowel bars. A fastener secures each pipe to a dowel bar.

Abstract: A plastic building panel having a thermoformed face and a thickened upper edge. The upper edge has a flange forming a downwardly facing U shaped opening. A flange at the bottom edge of the panel forms an upwardly facing U shaped opening. The panel is formed by first thermoforming a sheet of plastic and then heating along longitudinal fold lines near the edges of the panel and folding the edges along the fold lines to at least partially form the finished panel.

Abstract: A sheet metal web unit for interconnecting vertically spaced apart, horizontal wood chords, is formed as an elongated channel-shaped strut with integral, flat, connector plates on its upper and lower ends. The channel is curved and shallower at the lower end of the strut and gradually gets deeper and flatter towards the upper end. The width of the channel gradually decreases and the depth of the channel legs gradually increases from the lower end to the upper end of the strut. A W-shaped web unit is formed of four of such struts integrally connected together by common connector plates. The connector plates overlap vertical face portions of the wood chords and have struck-out teeth for embedding within those overlapped face portions. The ends of the channel leg portions which are closest to the connector plate teeth are extended to overlap and also embed into the adjacent chord face portion to thereby reduce the load on the tooth nearest to the respective strut end.

Abstract: A trim molding including an integral elongate member of a flexible material formed so as to have a base portion to be attached to a surface, such as the surface of an automobile body at the edge of a vinyl covering, a cover portion for hiding the base portion and the fasteners securing the base portion to the surface, and a hinge portion permitting the cover portion to be folded to a position covering the base portion. The base portion can include an integral snap receiving recess so that a snap means formed in the cover portion can be snapped onto the base portion when the cover portion is folded in to a closed position.

Abstract: A reinforcing rod or wire is formed with a plurality of helical and longitudinally continuous grooves. At least one of these grooves is of varying width and/or depth, and similarly may have a varying cross-sectional shape.

Abstract: A beam for supporting elongated panels from a fixed structure to provide a wall or a ceiling finish is disclosed having a generally U-shape, as shown in FIG. 2, with outwardly extending flanges (2) and downwardly extending mushroom-shaped connector lugs (3). Lugs (3) are cut from the material of the flange mid-way of the width of the flange (2) and said lugs are no greater in width than one-half the width of the flange (2).

Abstract: This invention provides a pre-tightening mechanism for effecting the initial application of a threaded closure on a threaded bottle neck. The pre-tightening mechanism includes a friction rail for effecting a turning movement of the closure relative to the bottle neck and a spring biased cap hold-down plate which maintains a substantially constant pressure on the closure and maintains the closure panel horizontal during the pre-tightening operation.

Abstract: An apparatus for making and filling a hinged box of a foldable material, more particularly cardboard, especially a hinged box for cigarettes, which box comprises a blank with front, rear and end walls, side walls formed from lateral flaps and a hinged lid. The end wall and front wall and the lateral flaps thereof are first simultaneously folded by movement of the blank in relation to folding tools into a position perpendicular to the rear wall and part of the blank adjoining the rear wall and thereafter further foldings are performed by the movement of folding tools in relation to the already partially folded blank.

Abstract: A box blank with receptacle and cover sections each with side and end flaps has a hinge panel joining the sections. A vacuum pickup draws a flat blank from a stack to a feed carriage which delivers the glue coated blank to a former and a forming head having concave and convex interacting pressure plates which maintain doubled over end flaps of each section in concave configuration while the folded end sections are adhered to form a box tray. Former flap benders cooperate with the tray forming head to shape the tray. A second vacuum pickup clasps the formed tray at the hinge panel and draws it from the forming head into engagement with folding elements such that cover and receptacle sections are bent together along the hinge panel to form a closed box.The machine implementing the process is cam and lever motivated with a gluer for forming the folded end flaps and holding the box partially closed after the tray is formed for loading articles into the box before it is closed.

Abstract: A process and apparatus for packaging products such as dusty powders are provided. The apparatus is an enclosed housing (e.g., a glove box) with an open lower end and having two glove openings with gloves attached, an opening for attaching a waste disposal bag thereto, and an optional opening for attaching a bag for product samples. The glove box has means for securing a bag in a filling position around the lower end and has the discharge end of a product fill pipe extending into the open lower end. There are vacuum means for applying a vacuum to the inside of the glove box and for applying a vacuum from the inside through apertures circumferentially arranged around the lower edge of the glove box. The described process involves attaching a bag, e.g., polyethylene bag, around the open lower end of an enclosed filling chamber (e.g.

Abstract: Packaging apparatus for making vacuum or gas-filled packages of the type including a flanged cup-shaped receptacle with a closure film sealed to the flanges and stretched down into the cup to engage and press against the product. The apparatus comprises a first packaging station where the film is sealed to the cup flanges part way around the cup mouth; simultaneously the film is heated in pre-selected locations to soften it for subsequent stretching. In a subsequent station, the partially-completed package is placed in a vacuum chamber and evacuated. Thereafter, a plug is driven against the still heated film, to force it down into the cup interior adjacent the product. Before or after the plug movement, the film is fully sealed to the cup, to make a hermetically-sealed package.

Abstract: Apparatus having a vacuum arrangement for reaching up to grip a flat carton blank and to draw the blank downwardly onto a support. As the blank is moved downwardly, it is drawn into an expanding U formation ready to receive a load of articles which are moved along a path and onto the bottom of the deposited blank, after which the blank is folded into a carton and secured relative the article load. While the loading, folding and securing operations are taking place, the vacuum arrangement moves back to grip the next carton blank that is to be loaded. The apparatus for moving each load inwardly on to the deposited blank allows for the formation of another load while the moving is taking place, said apparatus moving outwardly over the newly formed load.

Abstract: A hydraulically driven mower having a mower deck with conduit means in contact with the deck for flowing hydraulic fluid which powers hydraulic motors for driving cutting blade means positioned below the mower deck so that air flow created by the cutting blade means will provide heat transfer from the hydraulic fluid in the fluid conduit means through the deck member to provide cooling of the hydraulic fluid and a hydraulic drive system having a pressure relief means to direct hydraulic fluid supplied to a first hydraulic motor in series to the next hydraulic motor in series when the first hydraulic motor overloads to maintain sufficient hydraulic power to the second motor.

Abstract: A machine for removing the top foliage of sugar beets having a frame with longitudinal side walls and a longitudinal center beam carrying three gear boxes. Rotor assemblies drivably connected to opposite sides of the gear boxes are rotatably mounted on the side walls. A PTO drive is connected to a main drive shaft located above the center beam. A chain and sprocket speed reducer surrounds the main beam and transmits power from the main drive shaft to drive shafts connected to the first and second gear boxes. The chain and sprocket speed reducer is located within a housing mounted on the main beam. The main beam extends through the housing. Each rotor has a cylindrical member carrying a splined sleeve that is mounted on a splined hub connected to an output shaft of a gear box. A bearing assembly mounts the outer end of each cylindrical member to a side wall. A plurality of flail carrying assemblies having flexible rubber flails are mounted on each cylindrical member.

Abstract: A spinning ring formed of steel for ring spinning and ring twisting machines is partially hardened, i.e. in a locally limited zone of the spinning ring. At this zone there is located a traveller flange having a traveller guide surface. The spinning ring is consecutively provided in such zone with an outer running-in surface, which is softer in comparison with the hardened steel, and with a hardened core. The running-in layer is provided with an outer ferro-nitride layer adjacent to which there is provided an austenitic-martensitic transition layer containing nitrogen which continuously merges into the structure of the hardened zone, and the austenitic content of which decreases towards the inside, and the hardness of which thus increases. The traveller, upon wearing-off of the ferro-nitride layer can reach the increasingly harder and more wear resistant transition zone.

Abstract: An apparatus and method are provided for applying liquid to a yarn running at high speed, and with a relatively low resistance being imparted to the yarn during the application. The apparatus includes a roller partially immersed in a liquid bath, and having a circumferential surface composed of alternating lands and grooves in the circumferential direction. Means are provided for rotating the roller and for guiding the running yarn tangentially across the top portion of the roller, and such that the yarn advances at a linear speed substantially greater than the peripheral speed of the roller. The yarn guiding means is adjustable to permit the extent of the contact between the yarn and the top of the roller to be varied.

Abstract: In the open-end spinning unit provided with a casing and a combing roller rotatably mounted in the casing, a spinning rotor producing a twisted yarn from individual fibers carried from a combing zone defined by the combing roller, a carrying space formed between the combing roller and the inside surface of the casing, a mechanism for feeding a bundle of fibers into an upstream terminal of the carrying space, a dust removing mechanism communicated with the carrying space for discharging dust particles separated from useful fibers carried to the spinning rotor, and a combing roller provided with a plurality of combing elements, helically mounted on a main cylindrical surface thereof, the inside top or bottom surface of the dust removing formed in the dust removing mechanism is projected inside to a level corresponding to a level defined by an imaginary plan of a rotational trace of either one of the terminal ends of the combing elements helically mounted on a cylindrical body of the combing roller, in the condi

Abstract: In a fluid flow machine comprising a compressor including a compressor diffuser and a turbine including an exhaust gas diffuser compressed air from boundary layers or vortex flows in the compressor diffuser is bled off and used as a driving medium for removing exhaust gas from boundary layers or vortex flows in the exhaust gas diffuser. Since the pressure of the exhaust gas to be removed from the exhaust gas diffuser is below the ambient pressure a suction has to be established to remove the desired gas from the boundary layers or vortex flows. This suction is established by an ejector or a pump which is driven by the energy of the compressed air bled from the compressor diffuser.

Abstract: A fluid power apparatus for converting steam to hydraulic energy having one or more pairs of linear steam and linear hydraulic cylinders arranged symmetrically and with their axis parallel about a steam generator. The rod ends of the cylinders are connected to a wobble plate. Valving directs steam in and out of the steam cylinders and as the steam cylinders reciprocate, the corresponding hydraulic cylinders will be reciprocated generating hydraulic fluid pressure. Valving is accomplished by valving plates rotated by the wobble plate or by means of a slide valve positioned by a wobble plate actuated linkage.

Abstract: A linear engine/hydraulic pump system provides an efficient source of controllable fluid power thay may be used for a hydrostatic drive system of a vehicle. The engine/pump has a prompt first stroke full power capability and capability of prompt power increase from a lower power operation. A supplemental engine (bounce engine) produces output work to operate the power engine of the free piston engine pump during a compression stroke of the latter. The engine is of the opposed piston type with a synchronizer and cross drive to maintain controlled interrelated operational movement of the two oppositely moving pistons thereof while combining output work effort and holding approximately constant the approximate center of mass of the engine. A novel starter also is disclosed.

Abstract: The invention relates to a fluid supply system and seeks to provide a simpler, safer but reliable system than at present known. The fluid supply system comprises a multi-charge solid propellant gas generator and a fluid expulsion unit integrated into a single unit, the gas generator being provided in a cap (8) for a chamber (1) having a gas portion (3) and a fluid portion (2) and a movable partition (4) between these two portions operable to expel fluid from the chamber when the gas generator is rendered operative. The system also comprises ignition control means (22) operable to control the ignition of the solid propellant charges (13) when required to give a fully controllable system output.The system can be designed for supplying under pressure fluids such as hydraulic oil, fuels, oxidants and water and is particularly useful in aerospace applications.

Abstract: Pollutants are removed from a hot industrial effluent after which enthalpy is recovered from the hot effluent by converting a working fluid into a foam in a flashing unit and using the foam to propel a turbine. For liquid effluents the effluent itself serves as the working fluid. For gaseous effluents the scrubbing fluid used to remove pollutants is used as the working fluid.

Abstract: What is disclosed is a heat pump apparatus for conditioning a fluid characterized by a fluid handler for circulating the fluid in heat exchange relationship with a refrigerant fluid; two refrigerant heat exchangers; one for effecting the heat exchange with the fluid and a second refrigerant-heat exchange fluid heat exchanger for effecting a low pressure ratio of compression of the refrigerant; a rotary compressor for compressing the refrigerant with low power consumption at the low pressure ratio; at least one throttling valve connecting at the inlet side of heat exchanger in which liquid refrigerant is vaporized; a refrigerant circuit serially connecting the above elements; refrigerant in the circuit; a source of heat exchange fluid; heat exchange fluid circulating device and heat exchange fluid circuit for circulating the heat exchange fluid in heat exchange relationship with the refrigerant.

Abstract: An electrical outlet is connected in a parallel circuit to the compressor unit of a standard household refrigerator. A lamp can be connected to the outlet and will thus provide random lighting in the house in accordance with the on-off cycle of the refrigerator refrigeration unit thus giving the appearance that there is activity within the house to discourage burglars or the like.

Abstract: A device for detecting the quantity of a refrigerant circulating in an air conditioner for vehicles, provided with a sensing means which comprises a body having a hollow portion of a construction open to the outside thereof, projecting into the interior of the refrigerant receiver of the air conditioner. The sensing means also includes a floating element disposed within the hollow portion so as to float on the surface of the refrigerant therein. Thus, the sensing means has excellent resistance to shocks and vibrations, and can also be mounted in the refrigerant receiver even after the latter has been assembled. Also provided is an alarm means electrically connected with the sensing means to be actuated in response to the motions of the floating element, which may comprise a comparator means coupled to a time constant circuit, thus providing a stable alarm operation.

Abstract: An open top refrigerated display case having an upper display portion for displaying refrigerated products and a lower storage portion for storing refrigerated products. A cooling mechanism cools both the display portion and storage portion of the display case. The cooling mechanism establishes a refrigerated air band which encircles the display portion of the display case. This refrigerated air band is established by circulating air through an air conduit which surrounds the display portion and is positioned above the storage portion of the display case. Mounted within the air conduit is a fan for circulating air through the conduit and a set of evaporation coils for cooling the air passing through the conduit. Air is expelled from one end of the conduit at an outlet opening located near the top of the display case and such air is propelled across the opening in the display case towards the opposite end of the case where it is received by an inlet opening of the air conduit.

Abstract: A jewel of a brilliant type cut is made with facet angles with respect to the girdle plane as follows:(1) A planar table at .phi.=0.degree. (parallel of the girdle plane);(2) a pair of angles for one or a plurality of bezel facet rings at .phi..sub.1 and a pavilion facet ring at .psi., the pair of angles being within an intransparency triangle. The intransparency triangle is defined in the Cartesian coordinate system y=.psi.=0.degree. to 90.degree. above x=.phi.=0.degree. to 90.degree. on one side by the straight line .phi.=0.degree., and on the other sides by the transcendental curves (a) .epsilon..sub.o =.phi.-.alpha.-.psi. and (b) .epsilon..sub.o =180.degree.-3.psi.-.phi.+.alpha. respectively whereby .epsilon..sub.o is the sharp boundary of total reflection;(3) another bezel facet ring at .phi..sub.2 with angles between 50.degree. and 90.degree.; and(4) the range of the pavilion facet angles .psi.=25.degree. to 51.degree..

Abstract: This invention relates to an improved torsionally resilient coupling such as a flexible coupling, damper, gear-wheel or the like connector of the type comprising two concentric members each provided with co-operating grooves to accommodate solid cylindrical blocks of resilient material such as rubber or synthetic rubber-like material of any required hardness between the concentric members for the purpose of transmitting torque and providing the desired degree of torsional deflection and stiffness for any particular application.

Abstract: A slip spline connection including a pair of concentric telescoping members for connecting two universal joints for rotation together. The members and their joints move axially toward and away from one another in operation, and define a chamber therebetween which is subjected to a pumping action as the internal volume of the chamber increases or decreases. A lubricant, such as oil is provided in the chamber for lubricating the slideable spline connection between the telescoping members. Two concentric one-way valves are provided as a single unit, with a provision for air filtration, and is located along the axis of rotation where it is not influenced by centrifugal force. As the slip spline connection is compressed, air is expelled through one of the valves, and as the slip spline connection is extended, the other valve acts to permit air to enter the chamber.

Abstract: A padlock is provided with a straight length of the shackle adapted to be received in the socket of the lock with a reduced diameter to fit within the holes in the live tines of a standard electrical plug so that the plug may not be inserted into an electrical outlet.