Abstract: A grinding head has at least one expandable grinding tube mounted on an expansion cone. The expansion cone is carried by, and is rotatable with, an expansion rod which is coupled for rotation with a driven part of the head. The expansion rod and cone are movable by means of a ram to cause expansion and contraction of the grinding tube. The connection between the ram and expansion cone via the expansion rod includes helical coupling means whereby to cause a step-down in the effective stroke of the ram as applied to the expansion cone, which enables high accuracy in the expansion and contraction of the grinding tube.

Abstract: Recovery and feed system for abrasive blast in surface treatment comprising treatment and return by air to separate spent abrasive particles from dust and dirt and collecting the separated abrasive particles in a chamber, automatically withdrawing fresh abrasive particles from a storage bin when the recycle falls below a predetermined level in the chamber.

Abstract: A shield device is provided for preventing entrance of birds into a gutter underlying a roof comprised of corrugated panels. The shield device is comprised of a substantially flat shield member and a bracket centrally disposed on the rear face of said shield member. The bracket is comprised of a shelf portion and gripping means positioned beneath said shelf portion adjacent the outermost extremity thereof. The gripping means are adapted to enclasp and thereby frictionally engage a lip associated with the front edge of said gutter. A multitude of said shield devices is utilized to occlude the archways formed between adjacent corrugations resting in abutment with the front edge of said gutter.

Abstract: A portable building of the type having a floor, side walls and a roof structurally interconnected to form an integral building unit, the building also including skid means for engaging the ground and supporting the building in a free-standing condition, reinforced slide means being formed beneath the building floor for engaging and supporting structural chassis members of a transport vehicle while withstanding stress of sliding the building onto and off of the vehicle during loading and unloading, and means structurally interconnected with the building for sliding it onto and off of the vehicle, the building preferably being of modular construction and including self-contained service means such as air conditioning, electrical service and the like.

Abstract: A structure for a hexagonal building has a novel steel frame including a connection which joins tension ring members, columns and roof trusses together with threaded fasteners. The upper ends of the rafters are joined by a tension ring. The bottom of each column is secured to a base by means of an adjustable base plate. Rafters spanning between the tension ring and compression ring are located between adjacent trusses. The frame is adapted to receive prefabricated sandwich-type panels for both roof and walls.

Abstract: A base member having apertures formed therethrough for accommodating a lath and a stake employed for locating lines, grades and distance in construction survey, the base member also having a bore for accommodating a spike for securing the base to hard or frozen ground.

Abstract: A wall element for a construction wall to be associated with sanitary objects, has a body portion of self-supporting material, and provided with a channel-shaped gas-tight and water-tight inner hollow which forms a conduit for at least draining. The inner hollow is provided in the region of the body portion which normally serves for the connection of said sanitary objects, and has a height corresponding to the region of the requisite draining lines of said sanitary objects. The inner hollow has an inclined sole.

Abstract: Prestressed composite tension members comprise an assembly which includes compression and tension portions which are loaded longitudinally along or symmetrical with the center of gravity of the compression portion and prestressed causing both the tension and compression portions to cooperate in resisting lengthening of the assembly rather than the tension portion alone, thus lessening such elongations. In one embodiment, the tension member forms a tension member in a truss, having an upper chord and vertical webs acting in compression, and the tension member comprises a tensioned cable mounted within a series of abutting, slotted and glued wood members under compression. In another embodiment, the tension member comprises a tensioned cable centered in a plurality of tubes in compression, forming the truss lower chord.

Abstract: A plurality of footing pits are dug, and a preformed footing is placed in each. Each footing has a recess in its bottom covered by a sheet of flexible material, a grout inlet opening leading to the recess, and a plurality of relief ports. Grout is injected into the recess of each footing to seat it in its pit, and then a base plate support is installed thereon and adjusted to a selected height. Preformed beams are then mounted on the base plate supports, to provide a foundation for a building. Energy conservation is achieved by placing an insulating element vertically in each preformed beam, and solar energy collector equipment is mounted on the face of at least one beam. The solar energy collector equipment takes advantage of the location of the beams and their construction from precast concrete, and is of both the passive and active type.

Abstract: A building block including at least one internal cavity is insulated by molding an insulating layer from expandable thermoplastic polymer particles, such as beaded polystyrene, to one or more interior surfaces of the cavity. The molding operation is carried out by positioning a male plug member within the internal cavity of the building block with at least one peripheral surface of the plug member spaced from at least one interior surface of the cavity to provide a peripheral compartment into which the polymer particles are directed for molding the layer. Thereafter, steam, under pressure, is injected into the peripheral compartment to cause the particles to expand and fuse together into an efficient insulating layer that is expanded into close conformity with the interior surface(s) of the cavity. During the steam injecting operation a positive inwardly directed external force is applied to external surfaces of at least two opposed walls of the block to counteract internal forces generated by the steam.

Abstract: A plastic simulated brick wall free standing section adapted to be connected to other sections to form a brick wall.The plastic sections are of a open box-like structure having a simulated brick wall front. The sections are comprised of an even number of staggered tiers in which the tiers alternate in length to provide overlapping or overhanging bricks staggered between adjacent tiers one-half brick. In this fashion the sections may be inverted with respect to one another and interlocked and connected together by a pin passing through the overhanging end sections to lock the intertwined and interlocked sections together. A cap stone is provided at both the top and the bottom and extends forwardly from the front brick simulated wall a short distance so that when the sections are placed on the ground they provide a greater degree of stability while providing a pleasing appearance through the top cap stone.

Abstract: A fire resistant floor and ceiling assembly comprising in combination; a plywood layer; a gypsum floor underlayment extending adjacent below said plywood layer; a series of steel joists located below said underlayment and supporting the plywood and underlayment; a space-apart multiplicity of self-drilling self-tapping screws extending downwardly through the plywood and underlayment, and engaging said steel joists thereby attaching the plywood and underlayment to the steel joists, said screws having upper threads and lower threads with an interrupting non-threaded mid-portion therebetween, the non-threaded mid-portion extending a distance substantially the same as the thickness of said plywood layer; and, at least one layer of third generation fire resistant gypsum board connected to, and supported below, said steel joists by connecting means; whereby said assembly contains no combustibles in the plenum between said underlayment and fire resistant gypsum board, and whereby said assembly attains at least a one

Abstract: The invention relates to a power arm made of a bent, welded structure defined by two lateral plates and by an upper plate and a lower plate welded to the lateral plates and comprising a box having an upper cap and a lower base forming a cross piece of width equal to the spacing of the lateral plates, disposed between these plates in the zone of their elbow and welded to said plates. The cap and the case join, forming two angles, along two lines which pass substantially through the neutral axis of each lateral plate. The invention finds particular application in the manufacture of the boom of a hydraulically operated shovel.

Abstract: This invention relates to an automatic machine for closing the lower flaps of a parallelepiped box with foldable flaps and for then retaining the box in a position suitable for its filling with the product to be packaged. The machine according to the invention comprises a T section, a pair of parallel bars disposed in front of said section and a pair of lateral plates, all of which can be rotated sequentially from respective rest positions to respective work position in order to close sequentially the end lower flaps and the lateral lower flaps of a parallelepiped box.

Abstract: An improved method of vacuum packaging by using a specific laminated film as a package film, the laminated film being composed of a plastically deformable layer of a synthetic resin having a yield stress more than 50 kg/cm.sup.2 at a temperature of 23.degree. C. and an elongation of less than 30% at elastic limit at a shaping temperature of 50.degree. to 180.degree. C. and an elastic layer of a synthetic resin having an elongation of more than 40% at elastic limit at the shaping temperature.

Abstract: A harvester for harvesting only the blade or lamina from a mature kelp plant uses a plurality of harvester mechanisms for movement through a kelp bed adjacent the sea bottom. Each mechanism has a pair of helically formed spindles parallel to each other for relative counter-rotation, the helices being of opposite hand. A kelp stipe, encountering the spindles is moved upwardly thereby to bring the attached lamina into a channel forward of the spindles, adjacent which channel a cutter is positioned. When the lamina starts to engage the spindles they separate slightly and operate a linkage which in turn actuates the cutter to sever the lamina. The severed laminae are collected in a basket connected to the harvesting mechanisms. By harvesting only the lamina the plant can regenerate a new lamina and it is possible to have repeated harvests from a single plant.

Abstract: An illustrative embodiment of the invention provides an acoustic sensor for detecting stones and other hard foreign objects mixed within crop material in a harvesting machine susceptible to damage thereby. The acoustic sensor comprises a sensing surface disposed within an input path in the harvesting machine for impacting engagement with the flow of crop material therein and an acoustic sensing device coupled to the sensing surface for detecting acoustic vibrations induced within the sensing surface as a result of impact therewith by stones and other foreign objects mixed within the crop material. The sensor provides electrical signals in response to the acoustic vibrations indicative of the impact of the crop material and the foreign objects with the sensing surface and includes isolation means for obviating the effects of extraneous acoustical signals of the same character as the foreign object impacting signals to accentuate the foreign object impacting signals and thereby reduce the false alarm signals.

Abstract: The girder of a mowing device above which cutting members are arranged and which is destined to be suspended to the side of a tractor, is being loaded heavily on bending and/or torsion if the girder comprises remote from the end of the tractor a swath former. Therefore, the swath former is carried by a carrier extending on high level.

Abstract: An improved tree shaker includes a clamp for gripping a tree and a vibrator for vibrating the clamp to shake the tree. The vibrator includes first and second eccentric weights mounted to rotate in substantially the same vertical plane about spaced parallel axes of rotation. The tree shaker further includes a frame having a first frame member and a slidable second frame member with a hydraulic ram connected between the first and second frame members for sliding the second frame member relative to the first frame member. The hydraulic ram is located parallel to and outwardly spaced from a sliding beam of the second frame member.

Abstract: A rotary fruit picking head is provided and journaled from a suitable universally positionable mount therefor. The head includes a hollow body having peripheral wall surfaces extending along circular paths concentric with the axis of rotation of the head and the wall surfaces include the peripherally spaced generally oval fruit receiving openings formed therein having their major length axes extending along the aforementioned circular paths. The opposite ends of the openings include endwise outwardly projecting and inwardly opening stem catching notches opening inwardly generally along the aforementioned paths.

Abstract: As the baler advances across the field picking up windrowed crop material, the material is continuously packed into the lower, open end of an upwardly curved duct leading to the bottom of the main baling chamber. A loading fork sweeps upwardly through the duct at regular intervals to stuff an accumulated charge of materials up into the baling chamber from the duct, and a packer at the mouth of the duct continuously adds new material to the duct at such a rate as to precompress the charge of materials accumulating within the duct prior to stuffing thereof into the bale chamber. If the precompressed charge reaches a certain predetermined density level between stuffing cycles, the duct may expand transversely via a spring-loaded sidewall thereof to keep the charge from substantially exceeding the selected density level yet permit the uninterrupted infeed of still further material pending the next operation of the loading fork.

Abstract: A haymaking machine has two tined raking heads driven to rotate about upwardly extending axes from respective mountings. The mountings are connected to the rear of beams that converge forwardly to a right-angled junction in a common gear box. A coupling near the junction is connectable to a three-point lifting hitch and a pair of spaced apart plates from a pivot connected at one side of the plates adjacent the junction. A retaining element secures the beams in operative positions about the pivot. Each rake head has two freely rotatable tubular or cylinder supporting members positioned thereunder, each of which is pivotably connected to a lower portion of their corresponding rake head. A rear crop guide is pivoted to each rake head near its mounting by a quadrilateral linkage which can be secured in any one of a plurality of guide positions.

Abstract: A haymaking machine comprising at least one rotatably mounted rotor assembly a plurality of tine assemblies pivotally mounted on the rotor assembly eccentrically of the rotational axis thereof, linkage means coaxially mounted at one end on the tine assemblies and pivotable relative thereto, and to the rotor assembly, actuation means on the rotor assembly, and connecting means extending between the actuation means and the linkage means, the linkage means being connectible in at least one operating condition to the tine assemblies so as to be movable in unison therewith, the arrangement being such that in that operating condition the actuation means cause the tine assemblies to pivot from extended, crop-engaging positions to retracted, crop-releasing positions and vice versa.

Abstract: A method and apparatus for servicing a number of mutually adjacent spinning positions of an open-end spinning machine by means of a servicing apparatus which can move along the spinning positions. A travel drive is provided for the servicing apparatus for driving the servicing apparatus along the spinning machine when activated. Switches are connected to the travel drive for activating the travel drive responsive to being activated by an operator at a spinning station requiring service. A switch is also provided for de-activating the travel drive for halting the movement of the service apparatus in the neighborhood of the operator at the spinning station requiring service.

Abstract: The servicing apparatus is mounted for running movement along, and for pivotal movement laterally of, a path of travel having a first section extending adjacent spinning units of the spinning machine and a second section extending adjacent an end cabinet of the spinning machine. During movement of the apparatus from the first and to the second section of its path of travel, it is pivoted laterally of such path to provide clearance between interfering components of the apparatus and the cabinet of the machine that would otherwise preclude movement of the apparatus along the second section of its path of travel. Pivotal movement of the apparatus is realized by a cam means so located as to not impede traffic adjacent the machine or access to the interior of its end cabinet, and as to minimize the magnitude of the force required to produce the aforesaid pivotal movement.

Abstract: A machine for constructing a chain of metallic shaped links from a continuous wire including:means for shaping the wire in the form of a cylindrical wire spiral; means for gripping the first free turn of the spiral; means for cutting away the first spiral turn and associated with shaping means to urge the ends of the first turn to approach to one another, to form a chain link; shaping means to impart the desired configuration to the chain link; welding means to weld the ends of the chain link; and control means to move into the operative or inoperative positions and to make operative or inoperative in a predetermined time sequence and at desired times the various means composing the machine.

Abstract: A clevis type connection device has one leg thereof formed with a "blind" bore opening and another leg thereof formed with a through-bore opening, which is arranged in axial alignment with the "blind" bore opening; the bore openings thereof being sized to rotatably support opposite ends of a load engaging pin. The load pin is either removably retained or permanently installed within the bore openings.

Abstract: Gas turbine engine thrust is controlled by automatically adjusting compressor rotational speed with novel functions of engine inlet temperature to hold thrust to rated values for varying engine inlet temperature conditions. Furthermore, compressor rotational speed is automatically adjusted as a function of inlet pressure to provide a thrust rating schedule which varies with altitude. Compressor corrected rotational speed is limited through a novel function of engine inlet temerature to protect against turbine overtemperature when the engine inlet temperature exceeds the flat thrust rating point.

Abstract: A recuperated gas turbine engine fuel governor which controls fuel flow in response to both mechanical and electronic input signals.

Abstract: An electrical igniter device for a gas turbine includes a conductive tubular shell having a spark electrode section and an integral body section with an open breach end and a conductive sleeve coaxial with the body section for coaxially supporting one end of a helical spring. Means are described for retractably supporting the shell, sleeve and spring within a protective cylinder wherein the pressure in the combustion chamber exceeds the force exerted by the spring.

Abstract: The angle of the variable blocker door vanes in the bypass duct of a turbofan engine is varied in response to the angle of the variable compressor vanes of the engine. A cam and linkage assembly interconnect the blocker doors with the actuation system of the variable stator vanes such that as the angle of the stator vanes is modulated through a first predetermined range, the angle of the blocker doors is modulated through a second predetermined range.

Abstract: A thermal-mechanical energy converting device with at least two rotatably supported wheels and with one or more endless transmission elements of a material having a memory effect capable in the bending mode of converting thermal energy into mechanical energy when heated from a temperature below its transition temperature to a temperature above its transition temperature; the transmission elements serve to drive one wheel from the other wheel upon application of thermal energy to the transmission elements, whereby the thermal energy is transferred from the other wheel to the transmission elements over at least a major portion of the circumferential contact of the transmission elements with the other wheel.

Abstract: A composite energy producing gas turbine system which may readily provide pre-selected amounts of composite outputs including shaft energy, heat at pre-selected temperatures and additionally, if desired, cooling at pre-selected temperatures. The physical structure of the system includes one or more compressors, heaters, turbines and thermal heat exchangers.

Abstract: A power generating plant which includes a direct contact-type heat exchanger. A low-boiling point medium such as freon and a heat-source medium such as heated oil, are injected from a lower portion of the heat exchanger so that the two media are brought into direct contact with each other thereby vaporizing the gaseous low-boiling point medium. The low-boiling medium acts as a working fluid while it circulates through a closed cycle of the plant which includes a turbine and a condenser. The heat-source medium, circulates in a closed cycle of the plant which includes a heating unit.

Abstract: Combustion chambers for gas turbine engines and, more particularly, an annular combustion chamber. The combustion chamber comprises a flame tube having a back wall through which several vaporizers project into the flame tube or combustion zone. Each vaporizer has a pipe section extending within the flame tube, fuel supply and also supply ports in communication with the pipe section, and at least one outlet port for supplying a vaporous fuel-air mixture from the pipe section to the flame tube. Outlet ports of adjacent vaporizers are arranged spaced-apart from and facing one another, whereby a zone of maximum turbulence is formed between the outlet ports.

Abstract: A device for the transfer of a cryogenic medium between a fixed and a rotating conducting tube with a sealing device having a corotating sealing element to seal off an annular space between a fixed and a rotating section of conducting tube, in which the sealing device is disposed in the space with its radially oriented sealing element, which is fastened to the outside of the rotating section of tube, made sufficiently elastic that its radial dimension when rotating is increased by a predetermined amount to permit shrinkage differences occurring upon cooling to be equalized to a large extent so that a good seat is obtained.

Abstract: Cryopump apparatus includes means for supplying cryogenic fluid, means for supplying higher temperature refrigerant fluid, a panel having heat exchange surfaces on respective opposite sides thereof, with a conduit conducting cryogenic fluid therethrough, and a zigzag passageway formed by opposite sides of two radiation shields in spaced relationship with each other having the panel therebetween. The radiation shields are spaced from the panel, optically enclosing the panel therewithin. Corresponding edges of adjacent shields define open bottom channel-configured passageways for flow of gas therethrough to respective heat exchange surfaces of a panel interjacent the shields. The shields include conduits for flow of refrigerant fluid therethrough. Heat insulative positioning spacer means contact two adjacent panels and a shield therebetween, maintaining the panels and shield in spaced relationship.

Abstract: A method and apparatus for controlling operation of a semi-frozen product dispensing machine. The control system includes a viscosity sensing mechanism for sensing the viscosity of the product in the freezing chamber and for shutting off flow of refrigerant to the freezing chamber evaporator when the product reaches the desired viscosity. The control system also includes a refrigerant pressure sensing mechanism for sensing the pressure on the refrigerant in the freezing chamber evaporator when the supply of refrigerant is shut off and for restarting the refrigerating mechanism when the refrigerant pressure in the evaporator rises to a preselected value. The control system also includes circuitry for restarting the refrigerating mechanism when the dispensing valve is opened.

Abstract: A temperature controlled dough mixer having a bowl which is provided with a cooled sheet panel, a pair of cooled end panels and a cooled breaker tube extending between the end panels. A cooled agitator may be rotatably mounted between the end panels of the bowl. Cooling of the sheet panel is effected by a series of internal, side-by-side flow channels which are interconnected at alternate ends to define a plurality of segregated serpentine flow paths for an appropriate cooling fluid. The mixer also includes temperature sensing means for sensing the temperature within the bowl and control means responsive to the temperature sensing means for controlling the flow of cooling fluid through the cooled portions of the mixer.

Abstract: The present invention is an apparatus and method for cooling heat exchanger tubes at controlled conditions. The apparatus comprises a housing sealingly connected to each heat exchanger tube. There are water and air inlets to the housing. A means to generate mist is located within the housing and directed to spray a jet of mist from the housing into the heat exchanger tube. During operation, air is injected into each heat exchanger tube at controlled conditions. The air is followed by a water mist under controlled flow conditions into each tube. Carrier air accompanies the water mist. A controlled flow of water is injected into each heat exchanger tube after the water mist.

Abstract: In a large refrigeration system comprising a screw compressor of controllably variable output, compressor lubricating oil, discharged from the compressor in a mixture with compressed refrigerant, is separated from the refrigerant at an oil separator from which it is returned to the compressor. Compressed refrigerant flows from the separator, through a condenser, to a high pressure receiver, where it is held for circulation through an evaporator and thence back to the compressor.Through a bypass conduit in which a small liquid refrigerant pump is connected, condensed refrigerant from the receiver is delivered to a duct communicating the compressor discharge outlet with the oil separator inlet, to cool the oil-refrigerant mixture before it enters the separator. A thermostat senses temperature of that mixture near the separator inlet and so controls a throttling valve in the bypass conduit as to maintain that temperature substantially constant.

Abstract: A homokinetic universal joint having an outer member, an inner member arranged in the outer member, and torque-transmitting balls supported in window apertures of a cage which is arranged radially between the inner and outer joint members. The cage is formed on its radially outer side with a reduced diameter portion which extends axially thereof along the region of the longitudinal side of the window apertures adjacent the axially inner side of the outer member.

Abstract: A system for transmitting torque to a driven member from a drive shaft extending axially throughout the driven member which is itself of a tubular shape. The drive shaft is of a circular cylindrical configuration and at least one resilient spherical drive element is used to transmit torque between the drive shaft and the driven tubular member. The diameter of the resilient member is somewhat greater than the distance between the opposed surfaces of the drive shaft and the driven tubular member. A means is included on either or both the drive shaft and tubular member to retain the resilient member in a substantially fixed orbiting path and to retain it against longitudinal movement along the surfaces of the drive shaft and the driven tubular member.

Abstract: An automatic needle selection mechanism for a knitting machine, comprising one electromagnet for each of needle selectors, and a movable mounting plate for the electromagnets, arranged facing a selector bed. Each mounting plate with the electromagnetic is brought adjacent to its corresponding selector when the selector is in its first position where it is engaged to the movement of the selector bed. The mounting plate is first approached to the selector bed, and then the electromagnet is selectively energized. Then, the mounting plate is moved away from the selector bed. The selector which corresponds to the electromagnet energized is moved from the first position to the second position where it is disengaged from the selector bed, subsequent movement of the selector bed in the longitudinal direction of the selector thereby actuating the selected one of the needles in order to form a desired knitting pattern.

Abstract: A stop mechanism for knitting machines of the Rachel type comprising a reed with an upper flange fitted with a strengthening section projecting from and along a whole edge for guiding a thread. A contact which is fixed for threads not forming a nap, and is movable and cylindrical for threads produces a nap. The reed has small plates and blade components between these plates. The blade components are bent to form a groove for guiding the thread. Each blade component has two circular holes and one elongated hole and the built-in tendency for toppling over onto this contact. The blade components and small plates are connected by two spindles. The contact may have a chordal flat for increasing its contact area and is attached to an electrical conductor at one of its extreme ends and can be moved along a semicircular path by a crank. A metal spindle attached to an electrical wire passes through the circular hole innermost on the blade component.

Abstract: A device for subjecting web-shaped textile material to a wet pre-treatment in a damper while passing the textile material along a zig-zag path over rollers alternatingly pertaining to one of two substantially parallel vertical rows of rollers, and through a take off or plaiting device. The dry or squeeze-wet textile material is passed through a vacuum and directly subsequently thereto through a treatment bath. Thereupon, the thus treated textile material is withdrawn from the treatment bath and is passed into a damper where it is plaited for from 8 to 20 minutes (abgetafelt).

Abstract: A combination lock for bank vaults, safes and the like, including a pack of peripherally gated tumbler wheels loosely journaled for rotation on a tumbler post about a common axis in the lock case, a peripherally gated rotatable driving cam positioned by a manually operable dial and knob member to angularly adjust the tumbler wheels through a lost motion coupling to an opening combination for the lock, and a fence lever having a pivot connection at one end to a slidable bolt for movement arcuately between raised and lowered positions relative to the peripheries of the driving cam and tumblers. The fence lever has an upwardly arching body and a fence portion defining a foot formation projecting from the arched portion having a downwardly facing recess spanning most of its lower end portion and an elongated unitary contact bar member pivotally seated therein to normally bear on the driving cam periphery.

Abstract: A lock arrangement is provided which may be actuated by two different keys. A master key may be used to lock and unlock the device. A subordinate key may be used to lock the device only. The lock is of the pin-tumbler type in which the lock's rotatable core plug includes a shallow, longitudinal step groove cut into the top of the core plug. The subordinate key is identical to the master key except that one or more of the subordinate key's bittings is cut deeper than the corresponding groove or grooves on the master key, the additional depth corresponding to the depth of the step. When the master key is inserted in the keyway in the core plug, the pin tumblers are raised in the normal fashion so that the tops of the pins are even with the shear line between the core plug and the cylinder. The core plug may then be rotated in either direction.

Abstract: A method and apparatus in a hot multi-stand tube mill for producing a thin metallic tube having end portions which corresponds to the wall thickness and diameter of the rest of the rolled tube or alternately, tapered ends. Each stand is provided with a set of three cooperating rolls arranged to form a roll pass opening. According to the tube's positioning in the mill, an appropriate additional adjustment of the rolls to decrease or enlarge the roll pass diameter is made in one or all of the last three stands. Both an initial roll setting varying means and an additional roll setting varying means cause movement of wedges abutting the roll chocks thereby causing movement of the rolls.

Abstract: An apparatus for manufacture of corrugated pipes by the plastic working method comprises a stand-mounted assembly for clamping and sealing a pipe blank, devised in the form of two clamps arranged coaxially at a certain distance from each other to insert the pipe blank, and furnished with a hydraulic drive. The apparatus also incorporates a device for axial compression, and tools disposed symmetrically in relation to the direction of compression and reciprocating laterally to said direction for embracing the pipe blank. The apparatus contains a device for feeding shaping fluid into the pipe blank. The hydraulic drive according to the present invention comprises hydraulic cylinders, each having a movable link provided with a through passage and mechanically coupled with the respective clamp.