Abstract: A precision honing mandrel including a tubular honing member having a helical, straight or other shaped groove therethrough, a substantially cylindrical outer surface, a tapered inner surface, and a layer of a relatively hard wear resistant abrasive substance applied to the cylindrical outer surface, an arbor for mounting said honing member including a first arbor portion for mounting on a honing machine, and a tapered second arbor portion for receiving said honing member thereon, a guide member mounted on the opposite side of the honing member from the first arbor portion, said guide member having an end surface in abutment with one end of the honing member and a tapered inner surface for cooperating with the tapered arbor portion, a keyway formed in said tapered arbor portion and aligned slots in the honing member and in the guide member adjacent the abutting ends thereof, a key member positioned to cooperate with said aligned slots and with said keyway to prevent relative rotational movement between the ho

Abstract: Two substantially identical inflatable opposed frame elements, each consisting of a single unitary tube performed as by pleats or tucks causing the tube to assume a preestablished configuration when inflated, are connected at four points of intersection of the four tube ends with certain tube segments. Each inflatable element consists of an upwardly extending arch section, an upwardly extending brace section, and a substantially horizontal base section extending between and joining one foot of the arch section and the bottom of the brace section. The other foot of the arch section of each frame element intersects the base section of the other frame element, and the top of the brace section of each frame element intersects the top of the arch section of the other frame element.

Abstract: The Skylight Escape System of the present invention includes a roof curb which defines an escape opening to the roof therewithin. A pair of spaced guides project upwardly from opposite sides of the curb and a pair of spaced tracks are provided immediately adjacent thereto. A movable skylight which upwardly carries a translucent panel is formed with cooperating slides, which slides are in sliding engagement within the spaced tracks. The application of longitudinally directed forces to portions of the skylight causes the skylight to move along the tracks relative to the curb to expose the opening for building escape purposes.

Abstract: A vent and baffle used to provide an air passage between the soffit and the attic of a house to insure the flow of air through the attic. The vent is an elongated arcuate member having outwardly directed flanges adapted to be secured to the roof boards of a structure with suitable fasteners. A first baffle is a block having a semi-circular recess to accommodate and support the one end of the vent against the roof boards. The baffle is located in a tight fit or wedged relationship with the roof boards, adjacent roof rafters, and top plate of the structure to block the passage below the vent between the attic and the soffit and insulate the area above the top plate of the side wall of the structure. A second baffle is used without the vent to block the entire space above the top plate between adjacent roof rafters. The vent and baffles are made from a foamed plastic having flame resistant additives.

Abstract: A simulated rock assembly including a plurality of spaced rock-like members, connectors joining the rock-like members and end members extending from the end rock-like members; the rock-like members being molded of plastic material in a hollow configuration with an open face, the outer surface of the rock-like members having a rock pattern thereon, the opposite ends of the rock-like members having heavier sections adjacent the open face thereof, at least a pair of spaced openings in each heavier section, the openings extending generally perpendicular to the open face of the rock-like members, the connectors comprising at least two twisted metal wires, the wires diverging from each other adjacent to the ends of each connector with the end portion of each diverging wire being bent substantially perpendicular to the length of the connector for insertion thereof into the pairs of openings in the heavier end sections of the rock-like members, the end members comprising at least two twisted metal wires and the wires

Abstract: A strut assembly for a partition system includes an angular strut having a slotted upright normally captively disposed within the interior of a housing by lock structure. Tool access to the lock structure from without the housing allows of selective attachment and removal of the assembly from a position adjacent a post of the partition system as well as vertical adjustment of the strut while the housing remains stationary relative the post. A single strut assembly may alternately be attached to a rectangular or round post. In the former instance the housing and lock structure directly engage the post while in the latter case an intermediate hanger member serves as a stationary base for the attachment of the housing and the locking of the selectively positioned strut.

Abstract: An easily-installed fabric wall covering system making it possible to support a fabric sheet against a wall. The system is constituted by a frame of extruded molding pieces or tracks that are attached to the wall along the perimeter of the wall surface to be covered. Each track includes a storage channel having a generally rectangular cross-section whose base is extended beyond the rear end of the channel to define a wall mounting flange. The face of the channel has an adhesive layer thereon to hold the margin of the fabric sheet while it is being mounted, the excess tail of the sheet which extends beyond the margin being stuffed by a tool into an inclined inlet at the front end of the channel. This inlet is defined by dilatable jaws that are pried open by the tool to admit the tail into the storage channel. When the tool is withdrawn, the tail is clamped by the jaws to securely anchor the sheet on the wall.

Abstract: An insulated closure panel is disclosed, in the preferred embodiment of the present invention, for closing off openings under floors and roof decks where prestressed double tee concrete construction spans are used. The closure panel includes an insulating core sandwiched between two facing members. The top and sides of the facing members are undersized from the top and sides of the core, thus allowing the closure panel to be inserted into the opening of the construction spans such that the core can be snuggly fit in the opening while avoiding chipping of the facing members or avoiding pulling the facing members away from the core. The closure panel can be held in the opening of the construction span by foam type construction adhesive. Further, caulking can be added in the groove formed between the top and side edges of the undersized facing member and the surface of the construction span for providing a seal therebetween.

Abstract: A windshield or backlight glazing trim clip suitable for automobiles is provided having a resilient portion between the base and an upwardly projecting rib. The base engages a stud on the automobile body and elongated fingers on the rib save to secure a trim strip.

Abstract: A bulk storage vessel of generally cylindrical upstanding shape is formed with a plurality of wall segments which are assembled together in end to end relation to form subassemblies of circular shape. These subassemblies are then flange interconnected along upper and lower edges to provide a cylindrical vessel. Each of the wall segments includes a curved side wall of generally rectangular shape having roll formed flange structures along both its upper and lower edges and a vertical end flange at one end. The upper edge flange structures include an outwardly extending horizontal flange section and a downturned vertical flange section integrally rolled therewith. Along the lower edge, the flange structure includes an outwardly extending horizontal flange section, a downturned vertical flange section and an inwardly extending flange section joined to the lower edge of the downturned vertical flange and deflectable for interlocking engagement with the upper edge flange structure of an adjacent lower subassembly.

Abstract: An agricultural machine displaceable in a predetermined travel direction and having relative thereto a plurality of forwardly extending arms forming forwardly open throats for receiving respective rows of a crop during harvesting thereof has a position-detecting system comprising a feeler pivoted about an upright axis underneath each of the arms. Each feeler is an elastically flexible plate carried on a rigid arm connected to the respective pivot and each plate has a pair of lateral edges each exposed in front of a respective one of the throats flanking the respective plate. The feelers are all mechanically connected for joint pivoting by a common link that is connected to a signal generator in turn connected to the steering system of the agricultural machine.

Abstract: An automatic depth adjusting control system and method for controlling the vertical position of a pair of corn detasseling devices adjustably mounted on a farm implement for removing tassels from two adjacent rows of corn plants. The control system includes a parallel link system for supporting the corn detasseling devices, a hydraulic cylinder connected to the parallel link system for controlling the vertical movement thereof to raise and lower the pair of corn detasseling devices, and a crop sensing unit positioned forwardly of each of the detasseling devices for detecting the height of the corn plants in a corresponding corn row. Each crop sensing unit provides for the transmission of either a raise signal or a lower signal, in response to the height of the corn plants in an associated row, to electrical circuitry and then hydraulic circuitry for actuating the hydraulic cylinder.

Abstract: The disclosure is of a mower comprising cutter discs each driven from beneath by a transmission in a housing containing lubricant and made to be fitted onto a support plate by a displacement perpendicular to the plane of the plate and then secured by fixing elements which extend perpendicularly to said plane, the housings being interchangeable and lubricant-tight irrespective of the presence of the transmission means.

Abstract: The disclosure is directed to a combine with a unique sealing arrangement between the pivotable feeder housing and the inlet opening. The rearward portion of the feeder housing, extending into the inlet opening, includes spaced apart arcuate smooth edge plates which mate with, but do not contact, sealing blocks affixed to the inside vertical side edges of the inlet opening. The feeder housing further includes axially aligned pivot arms which extend away therefrom to engage a pair of support yokes which permit the housing to pivot vertically. The pivot arms and the edge plates have the same central axis so that pivoting of the feeder housing does not interfere with the sealing block/edge plate relationship.

Abstract: A crop height sensing assembly for use in a control system that automatically adjusts the depth or vertical elevation of a mechanical corn detasseling device in response to the height of a corn plant having a tassel with adjacent leaf portions. The detasseling device is adjustably carried on a portable frame for movement along a corn plant row, and the control system includes a hydraulic cylinder assembly for raising and lowering the detasseling device, and circuitry for actuating the cylinder assembly. The crop sensing assembly includes a rock shaft extended tranversely of the portable frame, a support for the sensing assembly carried on the frame forwardly of the detasseling device for movement therewith, a plurality of dependent sensor rods axially spaced on the rock shaft and rockable therewith in response to contact with the corn plant leaf portions, and a signal assembly responsive to the rockable movement of the shaft to produce a sensing signal for operating the actuating circuitry.

Abstract: A corrosion resistant rope in which the individual strands are sealed with a plastic foam impregnant and surrounded with a dense unfoamed plastic material is made by applying a foamable plastic to the individual wires of a series of wire strands, or, alternatively, to the individual strands as a whole, and closing the strands into a rope in a closing die while passing a nonfoamable plastic material into the closing die. Sealed plastic foam impregnated wire strands can be made in the same manner by passing nonfoamable plastic material into the stranding die during fabrication of the strand.

Abstract: The invention relates to apparatus and method for producing a wrap-around yarn of the type having an untwisted core thread with a binder thread helically wrapped around the core thread wherein the core thread is given a false twist and the core thread and binder thread are passed through separate openings through a hollow spindle to a core thread deflection point at which time the false twist is removed from the core thread and at which point the binder thread is wrapped helically around the core thread.

Abstract: An alarm watch has an electro-acoustic transducer with a sound releasing cavity containing a vibrating plate for releasing an audible alarm sound. The surface of the vibrating plate exposed to the open air is treated with a water-repellant material having the property to shed or repel water so that when water enters into the sound releasing cavity and wets the vibrating plate, the vibrating plate readily throws off the water thereby obtaining rapid recovery of the alarm sounding function.

Abstract: In a two-piece, round or shaped fluid-tight watch case, a combined caseband-and-bezel is fixed to the wall of a domed back by means of a snap-fitting or of gripping. A gasket is accommodated in an outer peripheral undercut situated along the top edge of the wall of the domed back and is pressed obliquely by an inclined surface exhibited by the caseband-bezel at the periphery of the undersurface of a flange. Since the undersurface of the glass is plane, the thickness of the flange determines the height of the space left for the hands.

Abstract: A gas turbine engine and method and control therefor particularly useful as the power plant for a ground vehicle. The gas turbine engine is of the free turbine type, and employs variable guide vanes to control the free turbine output. The guide vane control system is a combined hydromechanical and electronic control system to automatically regulate the guide vanes for both power regulation and braking modes.

Abstract: An expansion turbine is used to develop power, wherein combustion of fuel is carried out within the turbine. Increments of fuel are added to two or more points in the presence of a catalyst whereby temperature of the gas or equipment is controlled at substantially isothermal conditions.

Abstract: A first mixture of carbonaceous fuel and air is passed into the presence of a catalyst for essentially adiabatic combustion at a temperature above the instantaneous auto-ignition temperature of the mixture but below about 3,000.degree. F., thus avoiding nitrogen-oxide-forming temperatures. The gaseous effluent of this combustion is mixed with an additional fuel-containing component, which differs from the first mixture and which may utilize a different fuel, and the resulting mixture is homogeneously combusted at a temperature above the catalyst temperature, and above about 2,500.degree. F., to produce a gaseous effluent for use as a source of heat or power.

Abstract: A rotor support structure for a gas turbine engine comprises a rolling element bearing adapted to carry the rotor, a structurally strong ring adapted to carry the rolling element bearing, and two pairs of supporting struts for the ring, extending substantially tangentially from the ring, each pair joining at a mounting, the two mountings being diametrically opposed with respect to the ring.

Abstract: An exhaust system for withdrawing exhaust gases as well as combustion materials from a crankcase of an engine for a U-shaped straddle carrier includes an engine exhaust line which as an exhaust outlet adjacent the engine and an elongated pipe extending from the outlet of the exhaust line to an area above the frame structure for the carrier. A tube leads from the crankcase vent outlet to the exhaust line and has an open end which is located within the line spaced inwardly from the exhaust outlet of the exhaust line. The enlarged pipe creates a venturi effect adjacent the outlet of the exhaust line which produces a negative pressure at the outlet end of the tube and sucks the combustible materials from the crankcase vent into the exhaust line where they are ignited by the high temperature exhaust gases and are burned before exiting from the enlarged pipe.

Abstract: An exhaust manifold assembly for an internal combustion piston engine employs one exhaust tube for each cylinder and a collection chamber for each pair or larger group of exhaust tubes. Each collection chamber is connected to a plurality of exhaust tubes so that the exhaust timing spacing is the same in each collection chamber. A single exhaust reaction chamber is fed from pipes carrying the discharge from each collection chamber. The effect is to reduce backpressure and to improve scavenging efficiency while maintaining relatively high exhaust gas temperature for purification efficiency. The upstream end of each exhaust tube is supported and sealed within an engine exhaust port and the discharge end of each exhaust tube is slidably received within its collection chamber.

Abstract: A hydraulic control system is provided including a fluid reservoir, a variable displacement pump having a fluid input in fluid communication with the reservoir and having a fluid output, and a fluid actuated displacement control mechanism for controlling the displacement of the pump. A control valve is placed in fluid communication with the fluid output of the variable displacement pump and with the reservoir and is adapted to control the flow of fluid to a fluid actuated device. The control valve includes means for developing a control pressure signal.

Abstract: A readily portable hydraulic power source for supplying hydraulic fluid pressure to emergency hydraulic tools is foot-operated such that the operator's hands are left free to use the hydraulic tools and both the tools and power source may be operated by a single person. The power source includes a generally planar base member, a hydraulic pump fixedly mounted at one end of the base member, a foot-engaging planar member in generally overlying relation to the base member, a hinge connecting ends of the base member and the planar member for movement of the planar member relative to the base, and a resilient spring between the base and planar members to urge the members pivotally apart upon release of pressure from the operator's foot. The operator's foot is retained by straps and a heel retaining portion attached to the planar member, with the heel portion having an arm operatively connected to a hydraulic piston of the pump.

Abstract: A leakage gas return device for a Stirling engine includes a pumping cylinder divided into first and second chambers by a piston, one of the chambers for receiving leakage gas from the block seal through a first one way valve and returning the leakage gas to the engine cylinder through a second one way valve. The other chamber is first connected to a low pressure oil source to permit expansion of the first chamber by the leakage gas, and at bottom dead center the second chamber is connected to a high pressure oil source to thereby force the leakage gas back into the engine cylinder.

Abstract: A thermal energy scavenger assembly including a plurality of temperature-sensitive wires made of material which exhibits shape memory due to a thermoelastic, martensitic phase transformation. The wires are placed in tension between fixed and movable plates which are, in turn, supported by a pair of wheels which are rotatably supported by a housing for rotation about a central axis. A pair of upper and lower cams are fixed to the housing and cam followers react with the respective cams. Each cam transmits forces through a pair of hydraulic pistons. One of the pistons is connected to a movable plate to which one end of the wires are connected whereby a stress is applied to the wires to strain the wires during a first phase and whereby the cam responds to the unstraining of the wires during a second phase.

Abstract: A thermal energy scavenger assembly including a plurality of temperature-sensitive wires made of material which exhibits shape memory due to a thermoelastic, martensitic phase transformation. The wires are placed in tension between fixed and movable plates which are, in turn, supported by a pair of wheels which are rotatably supported by a housing for rotation about a central axis. A pair of upper and lower cams are fixed to the housing and cam followers react with the respective cams. Each cam transmits forces through a pair of hydraulic pistons. One of the pistons is connected to a movable plate to which one end of the wires are connected whereby a stress is applied to the wires to strain the wires during a first phase and whereby the cam responds to the unstraining of the wires during a second phase.

Abstract: The invention relates to a hydraulic brake booster for a vehicle brake apparatus which is provided with a pressurizing apparatus which has a pump and a reservoir (accumulator). When the reservoir pressure fails, a switchover piston which is subject to the reservoir pressure can disengage a stop for the push rod of the control valve.The push rod is supported on the stop when the pressure supply to the reservoir is intact and after the control valve switches over in the direction of brake activation.In this manner, a stop for the brake pedal, which activates the push rod is formed which is subject solely to the resiliency of a travel-limiting spring. The stop operates when reservoir pressure is available to effect a longer pedal stroke. When the reservoir pressure fails, it is automatically disengaged.

Abstract: Turbocharging apparatus for an internal combustion engine is provided which includes an exhaust gas driven turbocharger with an exhaust gas line leading to an exhaust turbine thereof to drive the same. In order to control the supply of exhaust gases to the exhaust turbine, a control valve is provided between the exhaust line and atmosphere for selectively venting a portion of the exhaust gases. The position of the control valve is in turn governed by a movable diaphragm communicated with charging air pressure by way of a regulating device, which regulating device is responsive to both the charging air pressure and the temperature of the cylinder head of the engine, to precisely control the turbocharger.

Abstract: The system utilizes a heat engine which provides shaft power and heat such as a conventional diesel engine in which part of the shaft power drives a pump for fluid to be heated; for example, a cryogenic liquid. The engine heat is used to heat and/or vaporize the cryogenic liquid in a heat exchanger. The heat available from the engine for transfer to the liquid to be vaporized is proportional to the power level of the engine. The heat required to heat the fluid to a desired temperature is proportional to the flow rate of the cryogenic liquid.By providing a loading on the engine which is proportional to the fluid flow rate, a sufficient amount of heat is provided to effect complete vaporization of the liquid, the amount of heat being directly proportional to the flow rate of the liquid. An engine radiator is provided to get rid of excess heat so that the heat supplied equals the heat required.

Abstract: A process and a plant for the recovery of water from humid air are disclosed. Humid ambient air flows through an adsorber in which an adsorbing agent removes moisture from the air by adsorption. Subsequently, air heated by an air heater and delivered by a fan flows through the adsorber in order to recover by desorption the moisture from the moistened adsorbing agent. Thereafter, the water vapor-containing air is precooled in a counterflow heat exchanger and subsequently conducted into a condenser in which heat is extracted from it by means of a heat pump so that the water vapor condenses and is available in the form of liquid water. The air cooled and dried in the condenser is utilized in the counterflow heat exchanger for precooling the air fed into the condenser. The heat given off by the heat pump is supplied to the air heater in order to be utilized therein for heating the air flowing through the air heater.

Abstract: A system and method for conditioning the air supplied to a paint spray booth enclosure in which the air is dehumidified during summertime operation by liquid absorption of the water vapor from the incoming air.The circulated absorption liquid is cooled to eliminate the heat developed by the dehumidification by a portion of the heat being rejected into the air exhausted from the paint spray booth. In one version, heat pump units are used to extract the remaining portion of the rejected heat with the extracted heat transferred to a regenerator heat exchanger utilized to provide heat to reconcentrate the liquid absorption solution. The heat pumps are also utilized to cool the supply air and the heat so extracted is also used to heat the absorption liquid during regeneration.

Abstract: Heat pump apparatus employing a continuous loop passageway containing a plurality of freely-movable, unrestrained bodies. The bodies are accelerated around the passageway in one direction by adiabatic expansion of a fluid between the bodies in an expander region of the passageway. The expanded, cooler fluid is discharged from the passageway via one or more vent-intake ports in the passageway beyond the expander region. Warmer fluid enters the passageway via said ports and is compressed between the propelled bodies in a compression region of the passageway, thereby raising its temperature from a first temperature (e.g., the temperature of the outdoor atmosphere or an industrial waste heat stream) to a second temperature higher than the first. The compressed, warmer fluid is thereafter passed through a heat exchanger to extract heat.

Abstract: A compression-type refrigeration system which utilizes the conventional suction line of such a system as a defrost conduit at periodic intervals and which incorporates an auxiliary heat exchanger which (1) can act to subcool the condensed refrigerant during a refrigeration cycle and (2) acts to heat the refrigerant coming from the receiver of the system during a defrost cycle.

Abstract: An automatically-defrosting household refrigerator including a user-operable "vacation switch" effective to enable the operation of the refrigerator in a mode appropriate to a condition of zero usage. When the vacation switch is thrown to the vacation position, the user is assured at once that unnecessary energy consumption will be avoided and the likelihood of failure of the refrigerator while unattended will be diminished. The mode appropriate to a condition of zero usage includes having the interval between successive automatic defrosting operations extended. Additionally, the vacation switch may be effective to simultaneously disable an automatic icemaker, to increase the temperature set point of the thermostatic control means which maintains the temperature within the refrigerator to disable anti-condensation heaters, and to disable butter conditioner heaters.There is further disclosed a particular means for extending the interval between successive automatic defrosting operations.

Abstract: A refrigerated case having an access opening for access to the interior of the case by customers in a store where the case is used. Ducts are provided in the case for circulating refrigerated air across the access opening from a discharge opening at one end of the access opening to a return aperture at the other end of the access opening. The refrigeration system used in the case includes at least one conduit carrying refrigerant at a temperature higher than that of the air bands. At least a portion of this conduit is located adjacent the discharge opening to raise the temperature of the case in the vicinity of the discharge opening sufficiently to impede the accumulation of frost.

Abstract: A multi-cylinder reciprocating compressor is automatically controlled in terms of two speed operation and selective utilization of the cylinders under single stage action to meet heating and cooling loads by way of a two step indoor thermostat and an outdoor thermostat. The compressor may supply energy to storage during heating and cooling or receive energy therefrom with the storage coil selectively loop connected to the outside or indoor coils. Subcooling return is directed to a specific cylinder and overrides refrigerant return vapor to that cylinder from other coils functioning as evaporators. Solenoid operated valves effect unloading of the compressor during start up and automatically effect removal or inclusion of selected cylinders to the single stage compressor operation. Automatic load responsive control of compressor drive motor speed is effected.

Abstract: A pair of readily separable and conjoinable band or bracelet members, provided with complementary integrally formed end fittings, snap together to form a unitary bracelet. At least one of the band members is reversible with respect to the other member. The end fittings of one member interengage with complementary end fittings of the other member. The two members may be generally arcuate in design.

Abstract: A method and apparatus for mechanical stitch formation with at least one continuous yarn or thread wherein a loop of yarn or thread is provided around a stitch forming needle, and this first loop is clamped at its distal end so as to be retained around the needle while the thread is drawn through this first loop so as to form a second loop engaging the first loop, whereupon the first loop is released and cast off of the needle while the needle passes through the second loop which is then clamped around the needle in preparation for a repeat operation for formation of successive stitches.

Abstract: A knitting machine including a plurality of needles extended by two superimposed arms one of which, bearing a butt, is flexible, while the other one extends the support face of the needle. The upper arm is embedded by the action of a cam on the butts of a needle-latch and held in the embedded position by an electromagnetically controlled selection of a selector element in order to put the needle in the row being processed out of action, or to hold it temporarily in its embedded position by causing one or several press blocks to act on one or several tracks formed by the alignment of preselected butts in either position of the needle-latch in order to tuck stitches upon each pass and for each system of a knitting carriage.

Abstract: A fabric composed of a fleece or backing of fibrous material with parallel rows of single thread, sewn-knitted, run resistant, stitches superimposed thereon; a method of making the fabric and a warp knitting machine which is suitable for the production of the sewn-knitted fabric. The fabric can advantageously be used for outer garments, household or space textiles.

Abstract: A method of knitting a blank for a sleeved garment on a knitting machine comprises the steps, not necessarily in the order specified, of knitting fabric for one sleeve and for an associated sleeve shoulder portion of a yoke for the garment, in which knitted courses extend lengthwise of the sleeve fabric and through the associated sleeve shoulder portion towards the neck of the garment, knitting front and rear body fabrics and associated front and rear body shoulder portions of the yoke, in which knitted courses extend in the waist-neck direction in the body fabrics and continue towards the garment neck through the body shoulder portions, and knitting fabric for the other sleeve of the garment and for an associated sleeve shoulder portion of the garment yoke, in which knitted courses extend lengthwise of the sleeve fabric and through the associated sleeve shoulder portion towards the garment neck, whereby the garment yoke comprises front and rear fabrics, each of which comprises a body shoulder portion and a p

Abstract: A warp knitting machine which includes a jacquard mechanism to control the pattern threads utilizes the jacquard mechanism to further control a thread breaking device and a thread tensioning device thereby providing an unusual thread pattern without the aid of a conventional pull thread.

Abstract: A dial for a combination lock extends through a disc mounted on the housing for supporting the dial. A pair of interchangeable members, one being used at a time, are used in conjunction with the dial. The first interchangeable member is a spacer mounted on the disc between the dial and the disc for spacing the dial from the disc and covering a portion of the disc. The second interchangeable member is a cover mounted over the disc. The cover has a window through which the dial can be seen. The window includes a lens with thin plates therein for directing light from the dial in a certain path so that the dial can only be seen from one position. The cover has members for securing the lens in the window so that it is not easily removed therefrom.

Abstract: In a tandem type rolling mill, it is difficult to control each roll bending force so as to produce a constant forward slip and a constant backward slip at each stand in the transversal direction.A first shape meter is disposed between a pay-off reel and a first stand and a second shape meter is disposed between a tension reel and a last stand. The roll bending forces under the first stand, the second stand, . . . the lth stand are controlled so as to produce a constant backward slip at the first stand as measured by the shape meter disposed between the pay-off reel and the first stand to provide a predetermined value.The roll bending forces under the first stand, the second stand, . . . the lth stand are also controlled so as to provide a constant forward slip at the last stand as measured by the shape meter disposed between the last stand and the tension reel to provide a predetermined value.The feeding of a roll coolant is also controlled together with the control of roll bending forces.

Abstract: A length of flexible metal piping includes an interlockably shaped metal band spirally formed into a plurality of winding groups wherein each group includes a plurality of interlocked windings. Each of the winding groups are connected to each other by at least one free winding wherein the leading portion of a first winding is separated from the leading portion of a corresponding subsequent winding and interlocking is prevented for at least one revolution. Each free winding, which constitutes one circumference of the piping, is formed by the insertion of a shaping tool into contact with the leading portion of the free winding prior to the point where this leading portion would normally interlock with the leading portion of a corresponding subsequent winding one revolution later. The shaping tool alters the cross-sectional arrangement of the metal band such that interlocking of that portion of this spiralling band which is contacted by the shaping tool is prevented.

Abstract: An assembly for maintaining alignment of a metal strip between successive roll forming means in an apparatus for forming a metal tube is disclosed. The apparatus includes a first set of roll forming means, which form the flat strip of metal into a generally U-shaped cross-sectional configuration, and a second set of roll forming means which form the U-shaped strip into a generally annular cross-sectional configuration. The assembly includes a pair of cylindrical hold down rolls which engage the guide respective marginal edge portions of the U-shaped strip into the second set of roll forming means. The cylindrical hold down rolls are rotatably supported by appropriate shaft means. The end portions of each of the shaft means are supported by vertically adjustable bearing means for adjusting the angular disposition of the shaft and the associated cylindrical hold down roll with respect to the marginal edge portions of the formed strip of metal.