Abstract: Apparatus for mounting awning panels adjacent the roof fascia, having an overlapping roof drip edge includes a header having a first plate adapted to be mounted flush with the fascia and having a flange extending underneath the drip edge. The header is provided with a channel along the upper edge thereof, with a flap having a flange along an edge thereof, the flange of the flap engaging the header in the channel. The other edge of the flap is fastened to the field of the awning panel, and a strip of sealing material is disposed along the interface between the flap and the channel.

Abstract: A steel concrete container with a roof formed as a suspended shell comprising sector-shaped precast, prestressed concrete elements and a reinforced concrete topping.

Abstract: A prefabricated building construction composed of a plurality of columns and beams adapted to be interconnected to one another to form a rigid load-bearing structural frame and a plurality of inexpensive lightweight non-load-bearing panels spanning the frame components, and each panel being generally of slab form and having a top, bottom and side faces bounding an inside and outside main generally planar face, and said panels comprising a main portion of molded waste material and a resinous binder forming a polymer and the minor portion of open cell material in spaced parallel cylindrical shafts embedded within the main portion of molded waste material with the shafts extending from the top surface to the bottom surface and one of said shafts being adjacent each of the side surfaces, said frame components being substantially concealed within the panels defining waterproof seams wherein the frame components serve as waterproof panel connectors, each frame component along one of the seams comprising a portion e

Abstract: A burial vault having a base of rather planar configuration, a dome like portion extending thereabove, and capable of securing with the base by means of a seat provided around the periphery of the said base that accommodates the lower continuous edge of the said dome portion; the base is provided with a pair of recesses that provide clearance for the location of the straps or other instrumentality as used during the handling and descent of the burial vault, with the dome portion of the vault having internal reinforcement, either in the form of integral ribs, or embedded rods, or a combination of each, so as to rigidify the dome and enhance its load supporting strength during usage.

Abstract: A construction for wooden stairs that provides for rapid layout and assembly of the stairs by using an interlocking technique that locks the treads and risers into the stringers without the use of fasteners, adhesives or wedges. The construction technique and the resulting unique stairs substantially reduces the layout and assembly time from that required by conventional stairs by accurately machining the required dovetail grooves in the stringers and the corresponding male dovetail on each tread and riser end. Each tread and riser are then slid into place in the stringers and are interlocked so that once the stairs are assembled and interlocked, it is impossible for the components to become separated.

Abstract: A two-part glazing system for use on the lower rails of the upper and lower sashes of a double-hung window. The glazing system comprises a moisture impervious liner member which is snap fit onto the lower rail and underlies the lower edge of the windowpane. A glazing bead is snap fit onto the liner member and extends therefrom to the face of the windowpane. The glazing bead has a gasket for sealing against the windowpane and defining an enclosed drain tank. The gasket prevents substantial amounts of water from reaching the drain tank. Any moisture which does reach the drain tank is drained away through outlet holes in the liner member.

Abstract: A door frame construction in which the jambs, threshold, lintel, and trim are of molded construction. The door frame may be molded in one piece and the jambs are provided with clips for attaching the jambs to studs framing the door opening. The clips are adjustably mounted on the jambs so that the door frame may be positioned properly despite misalignment of the studs to which the frame is attached. The jambs also carry clips for attaching the trim to the door frame, and these clips and the clips for mounting the frame on the studs may be formed integrally from a single strip of metal. The side and head trim are preferably formed separately and joined at the job site by means of a special corner construction which allows them to be joined without nails, screws or other external fasteners.

Abstract: An atachment system, and attachment clip therefor, is disclosed for attaching panel engaging ceiling runners, positioned either parallel or perpendicular, to air distribution bar structures and inverted-T runner ceiling supporting structures.

Abstract: Wall of timber logs is built by fastening log ends to vertical steel studs. Log ends are notched at inner side of wall to present flat notch faces to flanges of studs. Stud flanges are pre-drilled with vertically spaced holes and fasteners are extended through selected holes into log ends. Weather seals are formed between the logs and extruded plastic strip for this purpose is also disclosed.

Abstract: A roadway pole carrying an overhead luminarie or the like is mounted on a support comprising a stationary, hollow base member anchored to the roadway with hardware located within the base. The lower end of the pole is secured to the base by an upstanding collar, and the interior wall of the pole adjacent the collar is reinforced with a pair of sleeve members. Access to the mounting hardware is provided by an opening formed in the sidewall of the base. The opening is sealed by an access door that requires a special tool for its removal. In a break-away version of the support, the collar is secured to a wedge-shaped, break-away coupling. The coupling in turn is mounted in a seat formed on the stationary base member. The wedge-shaped coupling and seat constitute a locking angle and are held together by friction. An optional shear pin may be provided across the coupling-base interface to more securely seat the coupling.

Abstract: Rectangular floor panels are supported at each corner by a pedestal head. The pedestal head is supported by a vertical post and is formed of a single piece of sheet metal. The head has four orthogonally disposed arms extending outwardly, and each arm is provided with depending surfaces that engage a face of the post.

Abstract: The invention is a building structure of material which uses a water-activated binder, such as cement-mortar or concrete, and of a form having one thickness dimension much smaller than the other two dimensions perpendicular thereto. The structure includes a substrate sheet extending along a surface substantially perpendicular to the thickness dimension and a layer of the water activated binder material having a multiplicity of short metal wire reinforcing elements distributed therein.

Abstract: A building siding panel in combination with a backer board panel which has a top beveled edge and an identically beveled bottom edge. The result of employment of a beveled edge backer board insulating panel is easier installation; the backer board panel provides complete support for the rear facing surface of the building siding along its entire rearward face; the insulating effect is superior; and lessening of installation costs since time of assembly is significantly decreased.

Abstract: The invention concerns a wall remaining tight despite possible displacements of its panels because of the terrain.To this end, it involves joints formed of cylindrical parts 2 and 3, connected by a band 6 consisting of at least one fold 7, of such a kind that the allowed displacement of the panels 16 and 17 entails a deviation less than the length of the unfolded band 6.The invention applies to all tight walls.

Abstract: Composite members for foundation, floor and roof systems in structures, including multistory structures, the roof assembly of which includes a ceiling and roof member, between which members is sandwiched an expanded foam material; the floor and alternative foundation assembly of which includes base, intermediate, and top members, each having expanded foam material sandwiched therebetween; and a foundation assembly comprising a sub-floor member and a channel member having expanded foam material sprayed or poured thereon, which foundation assembly is adapted to rest on a suitable fill such as sand or fill soil.

Abstract: A loading system for loading articles into containers includes a container handling assembly and an article handling assemby, the paths of which intersect at a loading station. The container handling assembly carries a series of empty containers which it intermittently drives for moving the forwardmost one to the loading station while pushing a filled container from the loading station. The article handling assembly includes an input conveyor which moves the articles to a loading conveyor having alternating conveyor sections and window sections passing over the loading station. A platen carries a plurality of upwardly extending pins and is movable vertically between a receiving position with the pins disposed through complementary holes in the bottom of the container at the loading station and a depositing position wherein the pins are withdrawn from the openings in the container.

Abstract: An apparatus for sealing cans with lids under vacuum is provided with a vacuum chamber. The chamber is formed by two parts vertically movable by a lifting device relative to one another so that the chamber is closed when these parts have been moved together and open when these parts have been moved apart. A vacuum bell is mounted on the upper one of the two parts. The lower part has a recess in a surface thereof for receiving a can. A pressure plate movable to a limited extent relative to the upper part and forming part of a sealing device is provided to press a lid onto a can. Only the lower part is movable, the upper part is made fixed. The vacuum bell is movable relative to the fixed, upper part when the vacuum chamber is closed. A lifting device which effects movement of the lower part can be stopped in an intermediate position, in which the vacuum chamber is already closed, but the pressure plate is still in a lower position a short distance from the can.

Abstract: In a method for packing of powder formed goods in a container which is hermetically sealable under vacuum, a container blank is formed into an open topped container and a predetermined amount of powder formed product is deposited into the container. The product is slightly compacted by a piston which moves relatively slowly down into the container and presses the product at a relatively low pressure, the piston being then removed. In a second step, the product is compressed by a piston at a relatively high pressure so that the surface of the product is compressed to a level which is below the intended final level of the container. Thereafter the product is subjected to a relatively slight compression by means of a piston which, with a relatively low pressure, is pressed onto the surface of the product. In this third compression step, the relatively low pressure may be followed by a momentary thrust of the piston at a higher pressure.

Abstract: Webs of customer films and webs of related prints are transported in synchronism vertically downwardly toward a severing unit which subdivides the films into sections each of which includes several film frames and which simultaneously subdivides the web of prints into discrete prints. The film sections and the related discrete prints are gathered in separate magazines immediately below the severing unit and are automatically transferred into neighboring compartments of a pocket below the magazines when one of the magazines collects all sections of a customer film and the other magazine collects all related prints. Two closely adjacent windows are provided above the severing unit side-by-side to allow for simultaneous observation of film frames and related prints.

Abstract: Sugar cane harvester has stick alignment device mounted at forward end of harvester crop feed passage to promote longitudinal alignment of canes with said passage. The device comprises an arm mounted centrally in the passage and carrying driven sprockets and a chain. Cane stick engaging bars project from the chain to comb cane sticks into alignment with the passage.

Abstract: The invention herein described relates to a fruit picking device of the pole-type employing a manually operable hydraulic master assembly to operate a cutting assembly for severing the fruit with its stem and receiving said severed fruit in a net provided therewith. A pole attachment is secured at the end of said pole and a rim having a net is secured to said attachment for an angular adjustment with respect to the pole axis. The hydraulically operated cutting assembly is secured to said rim.

Abstract: An optical cable is assembled by inserting dielectric optical waveguides into a filament having periodically reversing helical grooves. Dielectric optical waveguide is unwound from fixed reels by movement of the filament past the reels. A rotatable guide unit has flexible tubes through which dielectric optical waveguide is guided, the tube ends being disposed within the grooves so that respective dielectric optical waveguides and grooves are maintained circumferentially coincident.

Abstract: A synthesis of four (4) factors is applied, through a test approach, to eliminate wire fractures, and fractures and overstressing of other cable components. This approach shows this "crucial flaw" is prevented from occurring amidst other flaws within the "flaw state" of the complex structure of work performing cable. These other flaws prove to be minor during the cable's service life.Non-frangible, ductile aluminum (al) and titanium (ti) wire are used in the cable assembly wherein their high dynamic properties and other attributes prevent wire fractures, and neutralize or reduce wire wear, depending upon load level, to change and improve the cable's "flaw state" so that a "fail-safe" cable may be designed to provide a protracted service life.Steel and copper wire fail to qualify for "fail-safe" cable constructions due to their low dynamic properties and other flaws in the cable structure.

Abstract: An apparatus for manufacturing a three-dimensioned crimp filament comprising: a drive means for pulling filaments; a group of guide rollers arranged in a reverse U-shaped roller group, said roller group being provided ahead of said drive means and adapted to be rotated about a longitudinal axis such as to give forward and rearward portions of a plurality of filaments while stretched with a single twist formed thereon and being transferred by said drive means mutually opposite twisting actions; a pair of rotative rollers each provided with a groove, said roller pair being provided immediately after the roller at the forward end in said roller group and provided with a non-slip means for pulling the single twisted forward portion of said filaments at a transfer speed such that the filaments of said forward portion form into a double twist and are cooled sufficiently to effect a thermal set; a heating means provided ahead of said roller group and serving to heat the filaments formed with a double twist; a single

Abstract: An aero-mechanical open-end spinning machine including spinning rotor cleaning means such as a fibrous brush or air jet for continuously agitating any foreign matter on the interior surface of the spinning rotor so that same may exit in the airstream accompanying the open-end spun yarn.

Abstract: An internal correction circuit is provided to correct the timepiece error caused by the crystal oscillator frequency changes. The timepiece operates by frequency dividing the oscillator frequency to obtain a predetermined operating frequency. The correction circuit is operated by the user on any initialization point, such as the start of any minute from a reference time source to generate a first input signal. The user at any following minute of the reference time source generates a second input signal.The correction circuit counts a first and second number of time units of different lengths between the first and second input signals. The circuit then forms a division ratio from the first and second numbers. That ratio is used to change the frequency divider division ratio to adjust the watch for the crystal frequency error just calculated.

Abstract: A toy timing device including an escapement-like mechanism regulating the movement of a movable portion toward a position on a housing toward which it is biased by the alternate slipping and sticking of parts of a rubber band extending over ribs on the movable portion as the rubber band parts move along a continuous surface of the housing.

Abstract: An indirect Brayton cycle is employed for an energy recovery system useful for large mass flow applications, such as a cast-iron making cupola. Exhaust gases from the cupola (elevated in temperature due to conversion by burning to CO.sub.2 and due to elimination of cooling of the exhaust passages) are directed to a turbine (which extracts energy to drive a compressor and electrical generator), the exhaust gases are then expanded (reduced in pressure), passed through a heat exchanger to release additional heat units to an air supply feeding the cupola, and then through the compressor to be raised in pressure to ambient for dumping. The exhaust gases are roughly filtered prior to entry into the recovery system and fine filtered after leaving the system prior to dumping; the residual temperature of the fine filtered exhaust gases is about 390.degree. F.

Abstract: A fuel nozzle assembly having a nozzle tip disposed in one end of a fuel delivery tube supported in a mounting flange. An air delivery tube, also secured to said support flange, encloses the fuel delivery tube to define an annular air chamber therebetween. The air delivery tube and the fuel delivery tube define interengaging tab portions providing a breech-lock engagement therebetween, with the tab members disposed closely adjacent the nozzle tip and effecting a sealing engagement between the nozzle tip and an aperture in the end of the air delivery tube through which the tip protrudes. To accommodate unequal axial expansion of the two tubes, the air delivery tube is mounted to the support flange with a flexible diaphragm.

Abstract: Disclosed is an exhaust gas cleaning apparatus of an internal combustion engine, provided with a three-way catalytic converter and a vacuum-operated flow control valve having a diaphragm for controlling the amount of secondary air directed into an exhaust manifold of the engine for an effective operation of the three-way catalytic converter. The diaphragm operates to increase or decrease the amount of secondary air in accordance with the change of vacuum force on the diaphragm, which force is generated by a vacuum signal transmitted into the valve from an intake manifold of the engine. Means are provided for compensating the difference in the vacuum levels between a high-load condition and a low-load condition so that the rate of increase in the vacuum force of the diaphragm is substantially kept near a constant value for every kind of engine condition. Thus, an ideal operation of the three-way catalytic converter can be obtained.

Abstract: A catalytic exhaust cleaning device for a high-power multi-cylinder engine of the type including independent carburetors and exhaust pipes for the respective cylinders. The exhaust pipes are interconnected for fluid communication therebetween at locations upstream of the respective catalytic converters arranged therein so that the latter are evenly fed with exhaust gases of substantially the same composition and volume and with substantially equal amounts of secondary air and operate effectively with substantially the same high efficiency. The exhaust communicating pipe interconnecting two adjacent exhaust pipes is divided into two sections, which are fixed at one end to the respective exhaust pipes and held at the other end in aligned abutting relation by a radially expansible tubular joint member, which is fixed to one of the two pipe sections and clamped against the other section.

Abstract: A hydraulic brake booster is disclosed which includes an integral accumulator to provide fluid pressure source for emergency failsafe braking. The accumulator includes a bore defined within the booster housing, and a piston slidably mounted in the bore which divides the latter into a pair of fluid compartments between opposite ends of the piston and corresponding ends of the bore. One of the compartments is communicated to the booster inlet port so that the compartment is charged with fluid pressure whenever the pressure level at the inlet port is above some predetermined low value. In one embodiment of the invention, the other compartment is communicated to the fluid pressure reservoir, and a relief valve is carried within the piston which controls flow of fluid between the two compartments.

Abstract: A starting arrangement for a pressure-charged internal-combustion engine in which at the beginning of the starting phase combustion air is delivered to the engine by way of a bypass valve and a throttle valve in the charge-air line from the pressure-charging device is closed. Two mutually independent variables are used for controlling the opening of the throttle valve. At the end of the starting phase a command variable typical of the process e.g., charge air pressure is used to initiate an opening of the throttle valve and an engine-dependent operating variable e.g., engine lubricating oil pressure is then used to actually move the throttle valve to its open position, the throttle valve then remaining in the open position so long as the engine-dependent operating variable does not fall below a specified minimum value.

Abstract: A fabric and containers constructed therefrom, formed of interwoven warp and weft yarns, characterized by a plurality of continuous reinforcing means woven into the fabric at spaced intervals among and parallel to the warp or weft yarns, or both, each reinforcing means comprising a plurality of periodically spaced unwoven sections lying on one or both sides of and in juxtaposition with the fabric.

Abstract: A trench lining assembly comprising at least two panels placed on each side of the trench and connected transversely together by at least one frame constituted by profiled pillars fixed at least temporarily on inner sides of the panels, said pillars cooperating with struts to form holding frames of the panels, and further providing means for longitudinally blocking the panels.

Abstract: An ice forming plate member pivots upon formation of a slab of ice of predetermined weight thereon and upon pivoting, a switch senses the pivoting and controls a refrigeration system for harvesting the ice slab by conducting heat to the ice forming plate member to release the slab of ice formed. Biasing means counterweight the ice forming plate member to prevent pivoting prior to the formation of an ice slab of predetermined weight, with the weight being approximately correlated with the thickness of the ice slab. Two or more ice forming plate members may be mechanically connected in parallel for forming two ice slabs approximately simultaneously. Heat for defrosting the two ice slabs is supplied at different rates to the two ice forming plate members to release one of the ice slabs at a different time than the other ice slab is released.

Abstract: Costume jewelry is manufactured through photofabrication processes from flat metal sheets to form items such as earrings and small pendants. A standard photo-fabrication operation includes covering a metal sheet with a layer of photosensitive, chemically resistive material commonly referred to as a photoresist. Portions of the covered sheet are exposed to light to outline the earrings and pendants on the sheet. The sheet is then developed and the exposed metal surface portions are chemically etched to remove excess metal and form the earrings and pendants. Thereafter, surface treatments involve supplementary photofabrication operations to provide different colors and finishes on the earrings and pendants by etching, plating and staining the exposed metal surfaces, all of which are supplemented by the retention of portions of photoresist layers of selected colors.

Abstract: A universal joint pivot assembly exhibiting extended life and capable of being inexpensively manufactured. Bushings for receiving trunnion journals are provided with a plurality of upstanding bosses formed by a cold forging process. The boss surfaces are inclined to generate a conical surface, and the ends of the journals are formed at a matching angle. In a preferred embodiment the bosses are comprised by ridges which terminate short of the center of the bushing to form a cavity for receiving an unmachined protrusion at the journal center.

Abstract: In the carriage of a hand knitter, the guide track includes a bifurcation formed by two elongated permanent magnets, opposite poles of which face each other across the bifurcation to form a nearly homogeneous magnetic field. Also mounted on the carriage, above the guide track bifurcation, is an electromagnet the axis of which is vertically aligned with the middle of the bifurcation. When energized, the electromagnet produces a field which reinforces the permanent magnetic field on one side of the vertical axis and opposes, and thereby decreases the field on the other side. As a result, a foot of the needle is attracted into the bifurcated track guide on the side having the reinforced magnetic field and follows this path which is defined by the corresponding elongated permanent magnet. Very little energy is used to accomplish needle setting in this manner, wherein the electromagnet setting signals are provided just as the needle foot enters the bifurcation.

Abstract: A knitting machine is comprised of a first pair of cooperating flat needle beds and a second pair of cooperating flat needle beds positioned behind the first. Cam slides are provided with cams for controlling the motions of the needles in the needle beds. The cam slides are mounted for travel in a single direction along a closed path extending around the two pairs of needle beds. At least one, but preferably all, of the cam slides is provided with cam arrangements capable of causing needles to perform normal-knitting motion, loop-delivery motion for loop transfer and also loop-acceptance motion for loop transfer. As the cam slide makes one trip in one direction along one pair of needle beds, it can cause loops to be transferred in both directions during the single trip. When a switchover to normal knitting is to be made, the cam slide need not be replaced but is merely reset for normal knitting.

Abstract: Needle bar for warp knitting machines with a number of needles individually set into slits of the bar and having shafts cranked to such an extent that the head section of each needle is in alignment with the shaft section accommodated by the slit. Slackening of the needles will thus not influence the needle spacing.

Abstract: A dispenser for use on an agitator-type washing machine is provided. Means are provided for mounting the dispenser on various machines by means of an adapter. The dispenser has a body of generally cylindrical shape which may be mounted on the agitator. The dispenser includes a measuring chamber for containing a volume of liquid such as bleach, soap, etc. Also included are dispensing and timing means for dispensing the liquid in the chamber a predetermined time after the initiation of agitator action. In this manner, liquid is not dispensed until after filling of the machine has occurred. In the first embodiment, the dispensing and timing means includes a double siphon arrangement. In a second embodiment, a single siphon arrangement is used.

Abstract: A locking arrangement using an actuating gear mounted on a cylinder lock for turning a gear wheel having locking bolt means linked thereto for movement to locked and unlocked positions responsive to movement of the cylinder of the cylinder lock. A spring-biased latch normally in the locked position is further provided which can be moved to the unlocked position, when the locking bolt means is in the unlocked position either by separate handle or by the further movement of the cylinder.

Abstract: The auxiliary locking mechanism of my prior U.S. Pat. No. 3,894,416 is more securely detended and greatly simplified in construction by forming the locking part of the mechanism that is to engage the surrounding metal as a rectangular body and forming a rectangular recess in the part of the surrounding metal that is to be engaged by the aforesaid locking part. The locking part is movable axially of the remainder of the mechanism so that when the mechanism is inserted into a rectangular opening in the side of the body remote from the rectangular recess, the locking part may be depressed and rotated to be aligned with the recess and then released so that it becomes seated in the recess and is securely detented.

Abstract: A lock sealing device is provided which has a male and a female portion joined by a hinge. The hinge is connected to an open end of the female portion and to a closed end of the male portion. The male and female portions have interengaging parts to effect a seal therebetween. The male portion has a shape to engage with a lock head to further seal the key entry area of the lock. A guide surface is provided on the female portion to guide and compress the engaging part of the male portion into sealing relation in the female portion.

Abstract: An apparatus and method for straightening an elongated workpiece such as a crank shaft is disclosed. At least four measuring devices are disposed along the workpiece for measuring the position of four points on the workpiece relative to an axis extending between the ends of the workpiece. Signals from the measuring devices are converted to curvature signals representing the curvature of each section of the workpiece spanned by a sequence of three of the points, and straightening blows are applied as needed to sections of the workpiece to reduce or remove the curvatures. Subsequently the measuring devices may be employed to measure eccentricity at the four points and further straightening blows can be applied to reduce or remove eccentricity.

Abstract: A horizontal or vertical roll stand for a rod or bar rolling mill comprising a pair of work rolls having a plurality of grooves spaced axially along the surfaces thereof, each work roll being journalled between bearings contained in bearing chocks, with the bearings being adapted to accommodate axial adjustment of the work rolls in relation to the bearing chocks. The bearing chocks are supported in a housing with the work rolls in parallel relationship and with the grooves defining a plurality of roll passes. An axial roll adjustment means is associated with each work roll. Both of the axial adjustment means are driven by a common axial adjustment drive. A clutch is connected between one axial adjustment means and the axial adjustment drive. When engaged, the clutch permits the axial adjustment drive to operate through both axial adjustment means, thus axially adjusting both work rolls simultaneously.

Abstract: A forging compound particularly adapted for hot die dwell forging of titanium and its alloys comprises boundary layer particles (boron nitride or graphite) and a major quantity (more than 60% by weight) of vitreous components. The vitreous components comprise diboron trioxide and silica frit containing a metal oxide wetting agent. In a preferred form, the forging lubricant comprises about 14 to 25% by weight boron nitride particles, balance, vitreous components. The latter comprise about 60% to 75% by weight diboron trioxide, balance silica glass containing cobalt oxide wetting agent in an amount of 1.0 to 3% by weight of the vitreous components. All the foregoing ingredients may be dispersed in a coatable carrier preferably comprising a solvent, e.g., xylene, in which a resin binder is dissolved.

Abstract: A working roller for a skew rolling mill which has the shape of a truncated cone is provided with internal passages for circulating a heat transfer medium therethrough to thereby control the temperature of the working surface of the roller.

Abstract: Apparatus and method for forming an elongate panel having a two-dimensional sectional profile into a curved configuration is disclosed. A pair or juxtaposed feed rolls compress the panel between them and advance the panel. A curving roll is located proximate and downstream of the feed rolls. The curving roll has a surface conformed to the outside surface of the panel, and is located in the path of the panel as it exits the feed rolls to bend the panel into a curved configuration. An anti-distortion roll is juxtaposed to the curving roll. The anti-distortion roll has a surface conformed to the inside surface of the panel, and the panel is compressed between the curving roll and the anti-distortion roll. The combination of the curving roll, the anti-distortion roll, and feed rolls cause the panel to bend about a neutral line within the panel, and the bending of the panel does not cause distortion of its side walls.