Abstract: A prefabricated approximately T-shaped blank of flexible sheet material with a pair of screened openings spaced apart from one another in the longitudinal portion of the blank is foldable along spaced parallel folded lines into a flat trap structure composed of outer and inner arch-shaped walls with screened skylights therein, the inner screened skylight having a small exit port therein. The structure thus formed has a floor panel with approximate arch-shaped side wings foldable upward therefrom into end closures for the structure, these wings containing small entrance doors near their fold edges. The screens are cemented to the border areas around their respective openings and these cemented areas covered by pairs of half-I-shaped border flaps integral with the blank and folded therefrom over the cemented areas.

Abstract: A toy garage having a cabinet provided with a plurality of compartments therein, a carrier for transporting vehicles mounted to move up and down and from side to side, and a control system including a plurality of actuating members for operating the carrier.

Abstract: A toy device which includes a tubular member or broad band ring and a rod or stick intended to be grasped at the proximal end thereof by the user while engaging and manipulating the ring therewith. The stick has a relatively small diameter in comparison to the inner diameter of the ring to facilitate inducing a twirling action of the ring as it is circumposed about the stick at various selectable locations along the length thereof. The ring, preferably having a frustoconical profile, includes an inturned rim defining the small end thereof. The stick includes a pointed distal end, preferably having a rubber tip, for selectively engaging therewith particular portions of the ring, e.g., the rim, as the ring is being manipulated. A disc is included which may be removably joined to the ring, if desired, to supplement the feats of skill that may be practiced and enjoyed by the user.

Abstract: A toy of the type which is designed to be tossed, thrown, or sailed through the air by hand includes a circular, lightweight plastic or rubber disc and a plurality of surface configuration modifying structures which may be selectively secured to the disc to predictably affect the aerodynamics around the disc during flight. The disc is self-supporting and has a centrally positioned circular opening therethrough. The flight altering structures include a funnel-type device, cup-shaped device, and a pair of fins. The funnel device and the cup-shaped device are selectively attached to one side of the disc in a position centered with respect to the circular opening. The fins are attached to opposing peripheral edges of the disc.

Abstract: The specification describes a flying top having an elongated lower portion for winding a string therearound and an enlarged upper portion which is provided with wings for flying the top upon rapid unwinding of the string.

Abstract: The present invention relates to facial likenesses or caricatures made of elastomeric materials and reinforced with wire in a manner such that the facial position can be manipulated to selectively alter the expression or appearance thereof.

Abstract: A wireless trans-ceiver control system for a motor driven toy vehicle having a transmitter for generating a predetermined carrier of selected high frequency, and a receiving unit including a super regenerative detection circuit for receiving the high frequency carrier and normally producing an amplifiable noise signal which is attenuated by the high frequency carrier. A relay switch, for reversing the power to the electrical motor driving the toy vehicle, is energized by the amplified noise signal to retain the switch in one position and release the relay to a second position when the high frequency carrier from the transmitter attenuates said noise signal. In a modification, a gearing train drives the vehicle in one direction in one position of the switch but drives the vehicle in the same direction and also turns the wheels for turning the vehicle in the second position of the switch.

Abstract: A method and apparatus for mechanically selectively preventing or permitting systemic sap flow in trees to prevent premature out-of-season bud formation, particularly in fruit trees, when unreasonably warm spells would promote flow of tree sap and consequently formation of premature buds which in the ordinary course of events will suffer kill back and result in serious tree damage upon reversion to normally cold weather, the method comprising cutting all around the body of a tree at a selected section from the bark to around the outer edge of heartwood; inserting at least a pair of perforated members having wicks or wick-like members in the perforations thereof in the cut area to both prevent healing and closing of the cut and to permit flow of sap when desired and at least a pair of members for cooperation with the perforated members to permit flow of sap through the perforations thereof or to block up the perforations to prevent flow of sap therethrough.

Abstract: A device for pressure-injecting a tree-treating liquid solution (such as an antibiotic, nutrient, or the like) into the trunk of a tree; the device comprising, essentially, an elongated, precisely tapered nozzle fixed on, and projecting from, a hand-manipulated carrier designed for use to forcefully thrust the nozzle--in effective jam-fitting and sealing relation--into a pre-drilled bore, of predetermined diameter, in the trunk of the tree, and to later remove the nozzle from such bore; the carrier having a passage therein leading at one end to communication with the nozzle, and means being provided to couple such passage at the other end with a source of the liquid solution delivered in metered quantity under pressure.

Abstract: A method and apparatus for mechanically selectively preventing or permitting systemic sap flow in trees to prevent premature out-of-season bud formation, particularly in fruit trees, when unreasonably warm spells would promote flow of tree sap and consequently formation of premature buds which in the ordinary course of event will suffer kill back and result in serious tree damage upon reversion to normally cold weather, the method comprising cutting all around the body of a tree at a selected section from the bark to around the outer edge of heartwood; inserting at least a pair of perforated members in the cut area to both prevent healing and closing of the cut and to permit flow of sap when desired and at least a pair of members for cooperation with the perforated members to permit flow of sap through the perforations thereof or to block up the perforations to prevent flow of sap therethrough.

Abstract: A grow-pot has one or more tubular members located therein for dividing the pot into a plurality of growing volumes. These tubular members can be segmented for easy removal and the bottom of the grow-pot is provided with means for holding the bottom of the tubular member in place. A clamping means can be positioned at the top of a segmented tubular member to maintain it in place.

Abstract: A new and improved smoke and heat vent including a frame assembly pivotally attached to a curb member adapted for placement on the roof of a building or the like. The frame assembly supports a dome-shaped cover and is movable between a closed, dome supporting position and an open, released position in which the dome-shaped cover is allowed to fall or slide downwardly by itself to clear an opening for the escape of heat and smoke under emergency conditions. The initial fall of the dome-shaped cover is retarded to remove any extra load such as snow on the cover and the cover is caught by several bands attached to the curb member so that it will not fall to a floor below.

Abstract: A vent door and frame assembly for cargo bodies includes a pair of rectangularly shaped frame members one of which defines a door frame opening and supports in hinged relation a vent door. The frame members during assembly with a wall construction are positionable in telescoping relation wherein they overlap opposite sides of a cargo body and when in this position form a permanent frame structure connected to the sides of the body. By virtue of the telescoping relationship of the frame parts the frame assembly is adapted to be readily utilized with cargo bodies having walls of different thickness.

Abstract: A roller assembly is provided for a sliding screen door, and the like, which includes a housing adapted to be supported as a friction fit in an opening in the edge of the door, and which also includes a roller supported in the housing. The roller may be spring-biased by a flat spring member which constitutes a resilient support for the roller and which is hooked into the housing.

Abstract: A meeting rail for application to overlapping marginal edge portions of sliding window panes when the panes are closed having a strip of semi-rigid thermoplastic material with longitudinally extending spaced apart ribs of flexible thermoplastic material being fused to the semi-rigid thermoplastic material and extending from one side of the strip and a pressure sensitive adhesive on the opposite side of the strip to enable the rails to be secured in pairs to said edge portions, height and spacing of the ribs being such that the ribs of opposing rails are disposed in interdigital relationship when the panes are closed.

Abstract: Grinding machine having annular dressing wheel whose inner surface is used for dressing.

Abstract: Method of grinding elongated, cylindrical workpieces in continuous operat in a grinding machine wherein the workpieces are advanced while they are rotated about their longitudinal axes includes exerting an oscillating grinding pressure transversely to the longitudinal axis of the workpiece, and adjusting the frequency of the oscillations to lie substantially in low-to-medium frequency range, outside the frequency ranges of resonant vibrations of parts of the workpiece and of the grinding machine; and device for carrying out the foregoing method.

Abstract: An automatic deseaming apparatus for an elongate block of metallic material comprises a defect marking detector for detecting defect markings which consist of a material containing a fluorescent pigment and have been deposited on defects in the surface of the block, a defect marking position detector for detecting the positions of the defects, a memory for storing the positions of the defect markings which are within the entire area or a predetermined one of segmented areas of the surface of the block, and a grinding controller for controlling reciprocative grinding action in the direction of the longitudinal axis of the block according to the defect marking informations stored in the memory.

Abstract: Small-diameter vitreous cylinders, for example glass tubes, are maintained under lateral (radial) compression and are precision rolled through grinding wheels, thus fully separating the cylinders into as many cylindrical components as desired. The rolling is effected by maintaining several glass cylinders in laterally-adjacent relationship between a drive roller and a pressure sheet, the latter being under very substantial tension. Thin grinder wheels extend through slots in the pressure sheet and thereby grind completely through the rolling cylinders. The drive roller and pressure sheet continue to roll the substantially separated cylinders, in precise synchronism, so that there is no breaking but instead only grinding.

Abstract: This invention relates to a duplicating grinding machine for grinding workpieces of irregular three-dimensional shape, wherein a model and at least one workpiece are mounted side by side in spaced parallel relation to one another between clamping devices so as to be synchronously rotatable about their longitudinal axes, said model and each of said workpieces having associated therewith two carrier arms each, one carrier arm associated with said model and at least one carrier arm associated with said workpiece being interconnected to form a unit and adapted to be brought into pressing engagement with said model and said associated workpiece, respectively, with one carrier arm of a first interconnected unit carrying a scanning roller for scanning said model and adapted to be translated along the length of said model and each other carrier arm of said first unit carrying a motor-driven belt grinding assembly having an endless grinding belt looped around a return roller and a contact roller, and with one carrier

Abstract: A measuring and control apparatus for internal grinding machines with resting shoes for cooperating with the outer surface of a workpiece, including a control device for controlling the displacement of the grinding wheel relative to the workpiece, with devices for measuring the displacements; and measuring devices for carrying out measurements of linear dimensions of the workpiece, the devices means for measuring dimensions of the workpiece including a first measuring device adapted to provide a signal responsive to the value of the diameter of said outer surface of the workpiece. The control device is connected to the device for measuring the dimensions of the workpiece for receiving the signal from the measuring device and for controlling the displacement of the grinding wheel relative to the workpiece depending on the signal itself, for the grinding of an inner surface of the workpiece concentric with said outer surface.

Abstract: Lateral force variations of a tire are reduced by detecting the variations in the conicity component of the lateral force with respect to the rotation angle in both forward and rearward rotational senses. The algebraic sum of the lateral force exerted by the tire parallel its own axis on a load wheel or road surface at successive angular increments of rotation in both rotational senses provide a variant signal which can be used to control grinding means to remove material from the respective tire shoulder regions in amounts and angular locations to reduce the variation of the conicity component and thus the total lateral force variation exerted by the tire in either rotational sense. The foregoing abstract is not to be taken as limiting the invention of this application, and in order to understand the full nature and extent of the technical disclosure of this application, reference must be made to the accompanying drawing and the following detailed description.

Abstract: A capsule containing fine abrasive grains dispersed in a liquid or low melting solid grinding aid can be substituted for conventional abrasive polishing grains. A novel coated abrasive structure is made by bonding such capsules to a backing sheet.

Abstract: A prefabricated structural system including a support frame and prefabricated panels having strength sufficient to bridge spaced support beams under the panel is disclosed. Each panel includes a sheet metal support subpanel having corrugations, a thin flat metal sheet as a top surface, and a layer of insulating foam filling the space therebetween. A Hypalon membrane is intimately and continuously bonded to the thin, flat metal sheet and has Hypalon fasteners disposed along each edge of the Hypalon sheet and connected to the Hypalon sheet by flexible flaps. The panels are disposed in a continuous array and fastener halves are joined and the corners sealed to provide a continuous Hypalon membrane unpenetrated by fastener screws above the array of panels.

Abstract: Protective covers for workmen and equipment including a ground or pedestal type terminal cover fabricated to protect ground and pedestal type terminals and the cable connections connected therewith against weather, moisture, water etc. A sealed enclosure rests on the ground and encompasses the terminal ends of buried cables and conduits, the enclosure having easily accessible opening panels for access to the ends of the electrical cables but offering extensive protection to these cables when the enclosure is fully filled. A sectional pole system is mounted atop the enclosure to provide support for above ground cables that are brought to the pole and admitted to the enclosure and its associated terminals. Also included is a portable easily assembled box-like unit which may be folded flat for transport, may be set over material and equipment and also used as protection for workmen.

Abstract: A storage bin such as a silo or the like having a plurality of sections adapted to be superimposed one on the other. The respective sections increasing stepwise in external dimension, in axial succession from bottom to top of said bin, and being telescopingly nested together between a collapsed and an extended position.

Abstract: A child's playhouse, or the like, particularly designed and constructed for being folded into a compact storage position when not in use and readily expandable to a complete playhouse type structure when in use. The structure may be permanently mounted on a wall, or the like, in such a manner that when the apparatus is in the storage position, the entire structure is unobstructive and may be either a decorative feature for the room wherein the apparatus is located, or may be a useful object therein, such as a chalk board, or the like.

Abstract: A laminating clip for temporarily holding adjacent wallboards having first and second sides against a base member with said first sides facing toward the base member including a first portion for attachment to the base member, a second portion attached to the first portion for extending through the seam between the wallboards and beyond the second sides, a retaining member mountable on the second portion for holding said wallboards against the base member while adhesive between said first sides and said base member sets, and a weakened portion between the first and second portions concealed by the second sides, which permits the second portion to be severed from the first portion by manipulating the second portion lengthwise of the seam to remove the second portion from the first portion to thereby remove all visible portions of the clip. A stud stiffener portion may be formed with the first portion of the clip to stiffen the leg of a metal stud in the event the latter constitutes the base member.

Abstract: A removable press anchor is formed of a tubular sheathing with a traction element carried for longitudinal movement within the sheathing. An anchor body is releasably connected to the traction element and is embedded in a press body which is formed by pressing in hardening material. The anchor body is formed of glass fibers so as to be destructible by cutting forces extending transverse to the longitudinal axis thereof and able to absorb large forces in the direction of its longitudinal length and only small forces in the direction transverse to its longitudinal length. In one embodiment, the anchor body is formed as a pressure member, and in a further embodiment it is formed as a traction member.

Abstract: Adjustable means for mounting skirting panels about a mobile home which may include a rigid mounting socket to be secured to the mobile home, a longitudinally adjustable stud, and a combined sleeve and base stake slidably mounted on the stud and fixedly secured to the stud after the base stake is first driven into the ground while so mounted, to fix the stud and sleeve relative to the ground.

Abstract: A shell silo is supported with its bottom stage clear of the ground by means of support legs which are secured to flanges integral with the longitudinal edges of shell sections. The legs are secured in this way to at least the bottom stage and, where there are three or more stages or rings, also to the third stage, the sections of alternate stages being aligned with one another. The legs may be formed of a hollow cross-section member having a projecting strip or flange through which the connection to the flange of the shell section is made, and a separated backing strip may also be provided.

Abstract: A foot grille comprises closely spaced, parallel tread rails of uniform, T-shaped cross section joined by crosswise key lock bars. The lock bars are tightly wedged in triangular cutouts in the web portions of the rails between upper and lower flanges of the rails. The heights of the lock bars are greater than the heights of the web portions of the rails, and the lock bars are notched to receive the lower flanges of the rails, thus to fix the lower ends of the rails. The top edges of the bars tightly engage laterally spaced-apart areas of the undersides of the top flanges of the rails to fix the upper parts of the rails.

Abstract: A stair nosing structure for stair steps comprises an elongated, substantially rigid base member having an interlocking portion and a channel portion positioned along opposing longitudinal edges thereof. An elongated tread member overlies and is supported by the base member, and includes a portion matingly engaging the base member interlocking portion, and a depending rib having opposed sides thereof positioned between the faces of the channel portion. A plurality of fastening clips are disposed in the channel portion of the base member and are regularly spaced therealong. Each of the clips has a rigidly resilient body with a first portion thereof connected with one of the channel faces, and a second portion thereof frictionally engaging one of the rib sides, and securely interconnects the base and tread members.

Abstract: A temporary transparent insulating installation is disclosed for mounting on the inside of a window frame. This installation provides for increased insulation of buildings without necessitating an increased number of glazings in a window. The installation comprises a clear plastic sheet with a length greater than the height of the window frame, having a first connecting strip along a top edge. The sheet has side edges with sealing means adapted to seal with two side surfaces of the window frame. The second connecting strip is permanently attached to the top surface of the window frame and is adapted to mate with the first connecting strip along the top edge of the plastic sheet. At least one weight is provided to hold down the plastic sheet on the bottom surface of the window frame. In another installation two or more clear plastic sheets can be hung in a window frame.

Abstract: A snubbing assembly for releasably securing a sheet of covering material to a wall panel module. The peripheral frame of the wall panel module is comprised of channels having a web wall and at least one side wall. The channels are disposed with the web wall facing inwardly of the module and with the side wall extending outwardly thereof. A longitudinal flange extends parallel with the side wall and is spaced laterally inwardly thereof to present a footed snub. Selectively movable gate means are carried by the channel to oppose the snub. An anchor means is secured to the marginal edge portion of the covering material and is releasably secured by the opposed interaction of the snub and gate means to maintain the covering material tautly upon the face of the wall panel module.

Abstract: Assembly of a fiber reinforced resin tank includes joining a plurality of prefabricated arcuate wall panel sections by elongated joiner panels extending along the vertical seams between adjacent wall sections to form the perimeter of a cylindrical tank. The wall sections have a plurality of openings adjacent the vertical sides and the joiner panels have columns of transversely spaced pairs of protrusions for coupling with the openings in adjacent panel sections. The joiner panel is able to pass circumferential hoop stress from one panel section to an adjacent panel section by providing effective clamping between the two panels through the use of continuous filament and/or geometrically oriented glass or other fibers placed into a hooked shape so the fibers extend between each pair of spaced protrusions and curve into the protrusions so the fibers extend along the protrusions.

Abstract: An improved porthole arrangement provided with a plurality of water drain holes to drain rain water or spray which may accumulate in the porthole arrangement and the porthole arrangement is also provided with a rain shield which allows the window of the porthole to be maintained in an open position for ventilation purposes and prevents the splashing of water into the interior.

Abstract: A cementitious, fireproof, wall panel is provided including opposite side faces and pairs of remote upper and lower and opposite end marginal edge portions. At least one side face of the panel has a plurality of generally parallel elongated stud members partially imbedded therein, extending thereacross and projecting laterally outwardly therefrom. The spacing between those portions of adjacent stud members projecting outwardly from the one side face of the panel define outwardly opening channels and insulation panels are snugly received and seated within the channels with the outer surface portions of the insulation panels being generally flush with the outer faces of the stud members. The opposite side face of the wall panel is similarly provided with parallel studs and insulation panels and the latter studs are staggered relative to the studs on the remote side face of the panel.

Abstract: A movable partition construction which employs a unique overlap joint feature and means for erecting the individual panels in place to obtain a movable partition which has at least a one hour fire rating to thereby provide fire resistive partition wall construction, which is easily erectable and thereafter demountable should the partitioning or removal be desired. The panels are prefabricated on the factory site with a variety of exterior surfaces and are shipped to the building or job site where they are easily positionable into partition wall-forming members permitting the erection of partition walls in relatively short periods of time compared to existing prior art expedients. The resultant wall is fire-resistive and aesthetic in appearance.

Abstract: Wall structure of a hot fluid chamber, comprisingAn inner metal wall;A plurality of support pins regularly arranged on and projecting outward from the surface of the inner metal wall;A plurality of coupling members fixed to the inner metal plate by the support pins, each coupling member being of a truncated quadrangular pyramid shape and made of a heat-insulating refractory material;A plurality of heat-insulating refractory blocks mounted between the coupling members, each block having the underside portion provided with a cushioning layer formed of an elastic refractory material;A heat-insulating layer formed of an elastic refractory material and covering the surfaces of the coupling members and of the heat-insulating refractory blocks; andAn outer metal wall covering the heat-insulating layer.

Abstract: A large light-weight deflection-resistant telescopic boom section of hollow rectangular cross-section comprises spaced apart top and bottom plates and spaced apart vertical side plates welded therebetween inwardly of the side edges thereof. Longitudinal corner stiffeners of angular cross-section are welded between the outwardly extending portion of the top and bottom plates and the associated vertical side plate to shorten the effective height of the side plate, to stiffen the top and bottom plates, to increase the mechanical section properties, and to provide a flat built-in slide pad bearing surface. Vertical side stiffeners of U-shaped cross-section are welded to the vertical side plates at intervals therealong and to the longitudinal corner stiffeners to provide the buckling resistance and increased shear load capacity of side plates.

Abstract: Beverage containers are commonly made with a ring at the top of the can for pulling a knock-out from the can top to provide a discharge opening through which a person can conveniently drink the contents of the can, or pour them into a glass or cup. The can top gathers dust and other contaminants that are a health hazard. This invention locates the discharge outlet at the bottom of the can and in a recessed compartment, and prevents contamination by closing off access to the can bottom by a shelf or other surface on which the can rests, so that the can itself acts as a shield to protect the discharge outlet area from contaminants.

Abstract: Hinged-lid packs are assembled on a turret-shaped conveyor with equidistant hollow mandrels which receive relatively soft first blanks at a first transfer station, blocks of cigarettes at a second transfer station, relatively stiff U-shaped second blanks at a third transfer station, and relatively stiff third blanks at a fourth transfer station. The first blanks are draped around the mandrels to form inner envelopes of packs, the second blanks are draped around the inner envelopes to form the so-called collars of packs, and the third blanks are draped around the inner envelopes and collars to form partially completed outer envelopes of packs. Each interruption of transport of blocks or improper transport of blocks to the conveyor entails an interruption of transport of first, second and/or third blanks, and each interruption of transport or improper transport of first, second or third blanks to the conveyor results in an interruption of transport of blocks and/or other blanks.

Abstract: A packaging machine of the type primarily designed to package objects normally having an outer curvilinear configuration within heat shrinkable material. A conveyor assembly is mounted on a housing and maintained in continuous motion along a predetermined path of travel whereby the conveyor assembly comprises a plurality of roller elements at least a portion of which are maintained in constant rotary motion so as to impart this rotary motion to the material and the objects being packaged. A plurality of heated cutting elements are disposed in adjustable, spaced apart position in substantially transverse relation to the path of travel and in interruptive, severing relation to the material at least partially encasing the objects being packaged. A heat tunnel is further provided to apply an additional heat environment to the severed packaging so as to conform the packaging essentially to the configuration of the object being packaged.

Abstract: A rotary-type lawn mower is provided with cutting means comprised of a rotatable disc-like member having a plurality of flexible non-metallic cords projecting radially from its perimeter. The disc-like member is rotated within the cutting plane by a suitable power source such as a conventional gasoline-driven engine, and at a velocity such that the projecting cords function to sever the grass in a substantially conventional manner. The cords are therefore of a length and diameter which are functionally related to effective cutting and are mounted within the disc-like member in brackets formed to support the cords against vertical as well as lateral deflection resulting from contact with the grass sought to be cut.

Abstract: Adjusting apparatus is provided for a rotary crop cutting knife on a row crop harvesting machine. The apparatus mounting the knife on the crop divider provides a tilting adjustment of the cutting plane about an axis transverse of the crop passage, a linear vertical adjustment of the cutting plane, and a tilting adjustment of the cutting plane about an axis longitudinal of the divider, the apparatus preferably being a rectangular bar, to which the knife is rotatably mounted in depending relationship, which has a portion telescoped within the divider frame and clamped there inside by an arrangement of bolts providing these adjustments.

Abstract: An end section adapted to prevent clogging of the end guard on a reciprocating type mower and having a single point, inner and outer cutting edges, and means of attachment to a conventional mower. The single point design results in economical production of an end section having superior cutting edges which can be easily resharpened when required.

Abstract: A power driven circular saw blade for cutting brush is extensible with scythe tips mountable diametrically thereon for cutting grass. The saw blade is horizontally mounted in a recess defined between forwardly extending sides of a wheeled cart, the sides acting as brush guides and stabilizing against a directional pull generated by the rotation of the saw blade in heavy brush, as well as providing a safety factor in shielding the operator and others from the rotating saw blade and scythe tips, and matter flung thereby.

Abstract: The present invention relates to a beater for a grape harvesting machine in the form of an elongated body placed laterally to the rows of vines, and being driven in a substantially circular movement and moving on one hand, transversally, and on the other, parallel to the rows of vines, as the machine moves forward along a row, which beater is characterized in that it is made of resilient material and is deformable longitudinally.

Abstract: This invention relates to a spun yarn spinning machine of the air injection type, which has first and second yarn twisting devices disposed between front rollers and delivery rollers. These first and second yarn twisting devices have air injection nozzles for injecting air obliquely fed toward the delivery roller side. These air injection nozzles of the first and second yarn twisting devices open into the cylindrical yarn passages of the yarn twisting devices so that the twisting directions of the yarns are in counter direction with each other tangentially of the passages at a predetermined angle with respect to the central axis of the passages of the first and second yarn twisting devices. The first yarn twisting device also has an untwisting device associated therewith for loosening the fibers before the fibers once twisted by the injected air in the first yarn twisting are fed into the second yarn twisting device.