Abstract: The present invention relates to systems and methods for controlling downhole motors. One aspect of the invention provides a valve-controlled downhole motor including: a downhole motor and a spool valve. The downhole motor includes a sealed chamber having a first port and a second port, a stator received within the sealed chamber, and a rotor received within the stator. The spool valve includes a barrel and a spool received within the barrel. The barrel includes an inlet port, an exhaust port, a first feed port, a second feed port, a first return port, and a second return port. The inlet port is located in proximity to the first feed port and second port. The exhaust port is located in proximity to the first return port and the second return port. The spool includes a first gland and a second gland.

Abstract: An insert for an earth boring drill bit, such as a PDC rock bit or a roller cone rock bit, is provided. The insert includes a base integrally joined to a top section, the top section having a first flank that curves in a substantially helical manner about a longitudinal axis of the insert to join a crest.

Abstract: A method of forming a wellbore includes providing a drilling assembly comprising one or more lengths of casing and an axially retracting assembly having a first tubular; a second tubular at least partially disposed in the first tubular and axially fixed thereto; and a support member disposed in the second tubular and movable from a first axial position to a second axial position relative to the second tubular, wherein, in the first axial position, the support member maintains the second tubular axially fixed to the first tubular, and in the second axial position, allows the second tubular to move relative to the first tubular; and an earth removal member disposed below the axially retracting assembly. The method also includes rotating the earth removal member to form the wellbore; moving the support member to the second axial position; and reducing a length of the axially retracting assembly.

Abstract: A drilling system for drilling out a sample of a formation, a well, or the like downhole. The drilling system has a drilling head having an at least partly hollow cylindrical body with a circumferential rim. The circumferential rim has at least one cutting edge. Furthermore, the drilling system has a driving unit for rotating the cylindrical body and the cutting edge for cutting a piece out of the formation, and a driving tool such as a downhole tractor for driving the drilling head forward in the well or formation.

Abstract: A raise boring reamer assembly includes a saddle, and a journal assembly carried by the saddle. The journal assembly includes nose and gage shanks, and a cutter is carried by the journal assembly. Nose and gage wiper rings are positioned proximate to the nose and gage shanks, respectively. The nose and gage wiper rings move debris in opposed directions in response to the rotation of the cutter.

Abstract: The present disclosure relates in one aspect to a cutting element comprising a substrate and a cutting layer disposed on a surface of the substrate. The cutting layer comprises an ultra hard material. The substrate comprises tungsten carbide and a metal binder. The substrate has a magnetic saturation value in the range of from 80% to less than 85%. In another aspect, the magnetic saturation value may increase within the substrate along a gradient, wherein proximal to the interface with the cutting layer, the substrate has a magnetic saturation value in the range of from 80% to less than 85%. Also included are drill bits incorporating such cutting elements. Additionally, the present disclosure relates to methods of manufacturing cutting elements.

Abstract: An apparatus for measuring articles includes a conveying part, a plurality of measuring parts and a determining part. The conveying part includes a plurality of conveyers placed adjacently in series for conveying articles successively in a straight line. The plurality of measuring parts measure weight or dimensions of the respective articles successively conveyed by the conveying part. The determining part determines the weight or the dimensions of the respective articles based on the measured values by the plurality of the measuring parts.

Abstract: The invention relates to a dynamic scale for bulk material, having two swivel arms (2) and two load-lifting arms (8) mounted to the free end of said swivel arms, with one hole (7) being located in each of the swivel arms (2) and positioned transversely to the extension of the swivel arm and also transversely to the neutral fiber brought about by the flexural load. A pipe (9) is fitted into the hole (7) and is welded thereto. The pipe (9) comprises two sensors (14, 15) transversely to the longitudinal axis thereof, said sensors being located at an angle of substantially 90° to each other and each being disposed at an angle of ±45° to the direction of the shear stress component ?xy. Under the influence of the shear stress, the cross section of the tube (9) is deformed into an ellipse that is inclined at about 45°, the shorter and longer axis (11, 13) thereof being measured using the sensors (14, 15).

Abstract: The present invention provides an improved weigh-in-motion scale. A slight increase in the thickness of a an upper, flexibly-deformable metal plate in a thin, flexibly-deformable plate system coupled with a change in the transverse locations of the load cells provides the improved weigh-in-motion scale, which is capable of weighing substantially heavier loads than previously known weigh-in-motion scales. In use, as weight is applied to the weigh-in-motion scale, the upper flexibly-deformable metal plate elastically bends. The strain gauges thus provide a changing resistive value proportional to the bending of the flexible element and the weight applied, to generate signals to the Wheatstone bridge circuit, which then provides output signals from the Wheatstone bridge circuit, which are proportional to the force applied to the upper flexibly-deformable metal plate.

Abstract: An electronic scale is provided with an automatic cable retraction device. The electronic scale includes a casing, a detection element, and the automatic cable retraction device. The casing forms an opening. The detection element is set in the casing for detecting a weight of an object-to-be-weighed and supplies the weight data. The automatic cable retraction device is received in the casing and contains therein an electric cable, which is withdrawable out of the casing and/or automatically retractable back into the casing. An end of the cable is connected to the detection element and an opposite end is coupled to an electric connector or a measurement controller, or a recording device. The electric connector or the measurement controller or the recording device can be retracted with the cable back into the casing through the opening. As such, an electronic scale with automatic cable retraction device is provided.

Abstract: An input device includes a knob (102, 702) having a rigid material (110, 710) defining an axis and having a surface opposed to the axis. Touch sensing layers (108, 708) are disposed on the surface that sense the position of one or more fingers (120, 122, 124, 126) applied thereto, the touch sensing layers (108, 708) providing a sensed signal (404) indicative of the position of the fingers (120, 122, 124, 126). An electronic device (104, 406, 412, 416, 704) is coupled to receive the sensed signal (404) and provides a gain signal based on the position of the fingers (120, 122, 124, 126) on the touch sensing layers (108, 708).

Abstract: A legged robot includes: a body; a leg portion; a foot portion; a falling direction detection unit that detects a falling direction of the body; a control unit; and a distance detection unit that detects a distance between a sole of the foot portion and a road surface. The distance detection unit includes at least three distance sensors provided on the sole, and the control unit includes distance sensor selecting means for selecting a distance sensor and gait data correcting means for correcting gait data based on a detection signal from the distance sensor selected by the distance sensor selecting means. The distance sensor selecting means selects three distance sensors among the distance sensors based on a detection result of the falling direction detection unit.

Abstract: An electric powertrain, a vehicle using an electric powertrain, and a method of manufacturing a vehicle having an electric powertrain are disclosed. The electric powertrain balances the ability of the vehicle to accept a given load, while at the same time affording the vehicle with an acceptable level of maneuverability. By selectively sizing the ratio of the inertia of the electric motor to the inertia of the vehicle, the optimum balance between these two competing concerns may be reached. Moreover, by optionally ensuring the Stemler Factor is less than or equal to the inertia ratio, the proper balance between load acceptance and maneuverability is attained as well.

Abstract: A moving object that moves through inverted pendulum control is equipped with a passenger seat in which a passenger sits, a chassis disposed below the passenger seat, a wheel rotatably mounted on the chassis, a drive portion that rotationally drives the wheel, and a weight unit that is provided at least partially in front of an axle of the wheel.

Abstract: A work vehicle includes an engine driven by gas fuel sealed inside a cassette gas cylinder. The cassette gas cylinder is installed in a cylinder mount. The cylinder mount comprises a mouthpiece support for supporting a mouthpiece of the cassette gas cylinder, and a shutter member swingable about a support shaft provided to the cylinder mount, for opening and closing an opening of the mouthpiece support from above the mouthpiece support.

Abstract: An electric scooter (1) comprises a collapsible chassis (2), a pair of driven wheels (4) at the front of the chassis (2) and a pair of casters (5) at the rear. An upright column (6) is supported on the chassis (2) and a foldable seat (3) is supported on the column (6). The chassis (2) comprises a pair of cross-members that make up an X-frame, such that the chassis (2) may readily be folded. The back of the seat (3) may fold down onto the base of the seat and they may together be pivoted downwardly and rotated through 90°, so that they fall within the plan area of the folded chassis. The height of the seat (3) on the column (6) is adjustable, to facilitate transfer of a user to and from the seat (3). An electric wheelchair is also disclosed.

Abstract: A transporter having a plurality of track-axle assemblies. The track axle assemblies have independent suspension, self-loading, and on-center axle rotation capability. Each of the track axle assemblies include a cylinder housing and hydraulic piston and first and second track units connected on opposing sides of the axle frame.

Abstract: A muffler of a construction machine is formed by respectively coupling silencers to entrance and exit sides of an exhaust-gas purifying device by flanges. In flange coupling portions, mounting seats are provided integrally with lower semicircumferential portions of the flanges of the silencers in a manner such as to protrude toward outer peripheries of the flanges. By coupling the mounting seats to muffler mount brackets attached to a muffler mount, the muffler is mounted on the muffler mount.

Abstract: The present invention relates to powered vehicles (e.g., lawn mowers) and, more particularly, to a velocity control system for use with such a vehicle. In one embodiment, the vehicle includes a power source such as an internal combustion engine and one or more drive control levers incrementally movable between a neutral position and a maximum velocity position. The system may also include a velocity adjustment member and associated mechanism that permits changing of a ratio between control lever movement and velocity of associated drive members or wheels. Thus, the system may limit a maximum ground velocity of the vehicle while the drive control lever(s) are positioned in the maximum velocity position and while an output level of the power source is maintained at a constant level.

Abstract: A power wheel chair is disclosed having an improved motion control comprising a frame having a seat for transporting an occupant. A right and a left caster wheel are located in proximity to a front frame end. A right and a left drive wheel are located in proximity to a rear frame end. A motor drives the right and left drive wheels through a differential gearbox. A right and a left handle are connected to frame for enabling an attendant to steer the power wheel chair. An electronic control has a control lever located in proximity to one of the right and left handles for enabling the attendant to control the speed and braking of the power wheel chair.

Abstract: An electric power steering apparatus including: a power system board which is received in a housing, which supports a component of a power supply circuit to supply power to a motor; a control system board which is received in the housing, which supports a component of a control circuit to control the motor, and which extends radially with respect to an axis of the motor output shaft; a rotation sensor which is provided in the housing, which is located, in an axial direction of a motor output shaft, between the motor and the control system board, and which is arranged to sense a rotational position of the motor output shaft; and an output terminal which is provided with the rotation sensor, which is connected electrically with the control system board to supply a rotational position signal of the rotation sensor to the control circuit.

Abstract: While a steering angle speed which represents a steering speed of the steering wheel is equal to or smaller than a predetermined speed, i.e., while the vehicle is making a steady turn with the steering wheel being held at a given angle or while the vehicle is running straight, when the rate of change of a rack load calculated by a rack load rate-of-change calculator becomes equal to or greater than a predetermined value, an EPS motor is supplied with a corrective current or which serves as a corrective signal for a drive signal in a direction to cancel out the rate of change of the rack load.

Abstract: Disclosed is a chromate-free resin composite damping material having a multilayer structure wherein a viscoelastic resin composition is interposed, as an intermediate layer, between metal plates. This chromate-free resin composite damping material is characterized in that (i) the viscoelastic resin composition is a thermosetting resin composed of an amorphous copolymerized polyester resin and a curing agent, and in that (ii) a chromate-free adhesive foundation film composed of 5-50% by mass of silica, 5-50% by mass of a polyester resin, 1-50% by mass of tannic acid and 0-30% by mass of a silane coupling agent is arranged on a metal plate surface which is in contact with the viscoelastic resin composition. This chromate-free resin composite damping material is excellent in durable adhesion.

Abstract: A panel assembly for a traffic noise barrier wall of the type including opposing slots formed in pairs of vertically-mounted posts is described. The panel assembly includes a sheet, which may be transparent, and a frame disposed along at least a portion of the perimeter of the sheet. Side portions of the frame capture at least a portion of the side edges of the sheet and are received within the opposing slots in drop-down fashion.

Abstract: A process for the production of an acoustically resistive structure that can be inserted in an alveolar structure so as to obtain a coating for the acoustic treatment, whereby the acoustically resistive structure includes at least one porous layer (34) and at least one reinforcement structure (36) assembled by gluing, the process including: applying an amorphous-type adhesive on the at least one reinforcement structure (36), perforating or micro-perforating the reinforcement structure (36) after the application of the amorphous-type adhesive, and applying the at least one porous layer against the face of the reinforcement structure (36) that is coated with amorphous-type adhesive.

Abstract: A muffling chamber (5) is located between a first main body wall (42A) and a second main body wall (42B) with respect to a height direction (AE). An outflow pipe (8) has: a first opening (8A) that connects an outflow passage (8R) with a muffling chamber (5) in the vicinity of a first main body wall (42A); and a second opening (8C) that connects the outflow passage (8R) with the muffling chamber (5) in the vicinity of a second main body wall (42B). The liquid staying on the first main body wall (42A) of a first muffler (4A) flows into the outflow passage (8R) through the first opening (8A). The liquid staying on a second main body wall (42B) of a second muffler (4B) flows into the outflow passage (8R) through a second opening (8C). Therefore, the symmetry of the first muffler (4A) and the second muffler (4B) is compatible with anti-corrosion.

Abstract: A method of making a sound insulating layered composite structure by roll coating a padding layer with an emulsion which may then be solidified to form a layer disposed over at least a portion of the padding layer. The emulsion may be applied using various devices and applied at thicknesses as to provide the capability to tune the acoustic performance of the composite.

Abstract: A fall arrest apparatus for building construction comprises: a base; a support column comprising one or more interconnecting stanchions, the support column having a proximal end mounted to the base; a boom mast having a proximal end rotatably coupled to a distal end of the support column; a boom operable to support a load, the boom having a proximal end coupled to the boom mast such that a distal end of the boom extends away from the boom mast; and a boom support assembly coupled to the boom and the boom mast such that at least a portion of the load is borne by the boom support assembly when the load is applied to the boom.

Abstract: An ascender device for belaying on a fixed rope, comprising a body with a trough, and an actuating lever having a pivot, a cam for clamping the rope, and a hole for attaching a safety means. A connecting arm with a button-hole is articulated between the pivot and body to move the actuating lever between an inactive position facilitating insertion of the rope in the trough and an active position wherein the ends of the pivot are housed in aligned recesses acting as bearings. A double lock comprises a first lock and a second lock to secure the two opposite ends of the pivot in the recesses, each lock being associated with an unlocking tab for releasing same.

Abstract: A folding leg support assembly for a hunter's treestand is disclosed. The assembly includes a bracket adapted for mounting to a platform and a leg support connected to the bracket. The leg support is movable about the bracket between an open deployed position and a folded stowed position.

Abstract: The buoyancy-gravity engine according to the present invention comprises buoyancy gravity rollers (1) which is constructed with specific dimensions and shape so as to perform its function effectively; a buoyancy chamber; a float regulation machine; a gravity machine with at least one wheel (3); a De-Pressure transfer box (9A); an interlinked BG roller (1) transfer mechanism; and a liquid compensator. The BG Roller (1) travels up and down through the buoyancy column and the gravity machine. When the BG roller (1) moves down in the gravity machine at least one wheel (3) of the machine is rotated due to the eccentric weight of the roller (1) in one end of the wheel (3). The roller (1) then slips down from the fingers of the wheel and rolls down to the mouth of the DP transfer box (9A). The roller is then pushed into the buoyancy column, and due to the inherent law of buoyancy, the roller (1) automatically reaches the top of the buoyancy column and again falls into the fingers of the gravity machine.

Abstract: The present invention relates to an automated teller machine for a vehicle driver, and more particularly, to an automated teller machine for a vehicle driver in which a display unit itself of the automated teller machine is configured to be rotatable so that the vehicle driver may manipulate the display unit conveniently, whereby the vehicle driver can easily verify the data displayed on the display unit and input the information as necessary.

Abstract: An apparatus for use with construction of concrete through forms comprises a fixture attached to a lifting vehicle, a vertical component having an inner portion and an outer portion, a base component configured to support the vertical component, the base component having two or more parallel portions crossing two or more perpendicular parallel portions, and two or more brackets on the vertical component, wherein the brackets contain hook elements on one side.

Abstract: A screw elevator comprises a pair of counterweight guide rails, a pair of deflection wheels, a counterweight frame, a screw, a power unit, a cable, a car and a car guide rail. The power unit, the screw and the counterweight frame are all disposed between the pair of counterweight guide rails. The power unit drives the screw and the counterweight frame to move, and then the movement of the screw will drive the cable to make the car move upwards and downwards along the car guide rail. The cable has one end fixed at a position above the counterweight rails and the other end of the cable is finally fixed at the center of the top of the car after being wound around a traction wheel and straddled over the deflection wheels.

Abstract: An elevator device where drive means has a first drive device including a first drive sheave and a second drive device including a second drive sheave. The dimensions of the first and second drive devices measured in the direction of the rotation axes of the first and second drive sheaves are greater than the dimensions in the direction normal to the rotation axes, and the first and second drive devices are arranged such that the rotation axes are horizontal. Suspension means includes a first suspension belt passed over the first drive sheave and a second suspension belt passed over the second drive sheave.

Abstract: An elevator system (20) includes a propulsion power assembly (38) with a power rating below that required to move a fully loaded elevator car (22) using a contract or design motion profile. One example propulsion power assembly (38) uses more than one motion profile based upon existing load conditions. One example uses a first motion profile including a first power parameter limit for load conditions at or below a selected load threshold that is less than a maximum load capacity of the car (22). The propulsion power assembly (38) uses a second motion profile with a lower power parameter limit for other load conditions. In one example, electrical current is the power parameter selected as a decision parameter dictating which profile to select based on an existing load. Another example propulsion power assembly (38) selects at least one of a speed limit or an electrical current limit based on an existing load and maintains a speed to stay within the selected limit.

Abstract: An elevator cab ceiling includes an upper ceiling panel and a lower ceiling panel that are vertically spaced apart from each other with an intermediate ceiling cavity between them. An inlet duct is associated with the upper ceiling panel and an outlet duct is associated with the lower ceiling panel. The inlet and outlet ducts are horizontally spaced apart from each other and are fluidly connected to each other through the intermediate ceiling cavity to form a ventilation path. This separation of inlet and outlet ducts by an intermediate ceiling cavity reduces airborne noise transmissions that enter an elevator cab through the ventilation path. In one example, at least one baffle is installed within the intermediate ceiling cavity between the inlet and outlet ducts to interrupt a flow between the inlet and outlet to further reduce any transmitted noise.

Abstract: Disclosed is an electric disc brake. The electric disc brake includes friction pads for pressing a disc, a carrier for supporting the friction pads, a caliper housing supported by the carrier such that the caliper housing moves back and forth to press the friction pads, and a pressing device for pressing the friction pads. The pressing device includes a pressing member moving back and forth in the caliper housing to press one of the friction pads, a screw shaft coupled to the pressing member, a worm wheel coupled to the screw shaft, a driving shaft crossing the screw shaft and having a worm gear engaged with the worm wheel, a motor for rotating the driving shaft in a forward direction or a reverse direction, and an auxiliary pressing device.

Abstract: A vibration damper including a cylinder in which a displacer carries out a translational movement. The displacer has a work piston which divides the cylinder into two work spaces. The work spaces outside the displacerfor each operating movement direction of the displacer are connected to damping valves by a flow connection. Every flow connection has only one flow direction through a check valve arrangement. The flow connection has a plurality of inflow ports which are offset in axial direction starting from the work spaces and is formed by a bypass channel, and a plurality of damping valves are connected to the bypass channel and admit damping medium via the inflow ports.

Abstract: The impact absorbers having different lengths are formed by providing notches in one of opposed surfaces on front end side in a collision direction of a square pipe having a square in cross section. The three impact absorbers are disposed in a width direction while two impact absorbers are disposed in a height direction such that directions of the notches differ from each other, and the impact absorbers are disposed in integrally welded to form the impact-absorbing member.

Abstract: A compartmented multiple-item carrying case (10) adapted for construction of configurable dividers (60, 62, 64, 66, 68) is formed with matable building elements (82, 84, 86) arranged by a user to provide interior compartments (40, 42, 44, 46) of customized shapes and sizes. User configurable interior compartments enable efficient item placement and storage because the items a user desires to carry at a given time can differ in size and shape.

Abstract: A handling baggage, constituted from a trolley or a suitcase, equipped of a couple of sliding shoes in elastic material, able to slide on stairs, facilitating the crossing.

Abstract: A control section determines a driving state of a vehicle and controls first and second solenoid valves on the basis of the determined driving state. An oil passage length of a second oil discharge passage is shorter than that of a first oil discharge passage and a discharge end of the second oil discharge passage is opened at a lower position than that of the first oil discharge passage. The control section derives hydraulic oil, discharged from an oil chamber via a first shift valve, to the first oil discharge passage by means of a second shift valve when it is determined that the driving state is one during normal driving. The control section derives the hydraulic oil to the second oil discharge passage by means of the second shift valve when it is determined that the driving state is one required for rapid lock-up off.

Abstract: Example aspects of the present invention broadly comprise at least two concentric rings with complementary ramped surfaces, at least one of the rings being rotatable relative to another one of the rings so that contact is made at the ramped surfaces. The complementary ramped surfaces form respective circumferences of the rings. At least one of the ramped surfaces may have a sinusoidal profile, or a profile forming at least one of a straight line, concave, or convex. In some example embodiments of the invention, a first one of the rings is a coupling member and a second one of the rings is a tubular slipper with a friction surface radially opposite of the ramped surface. The tubular slipper is arranged to radially expand or contract upon contacting the coupling member.

Abstract: Example aspects of the present invention comprise two concentric rings, the rings movable relative to each other and defining a clearance between them for receiving at least one ball. The first ring is a coupling member, the second ring is a tubular slipper with a friction surface on the far side of the clearance, and the ball contacts the coupling member to the tubular slipper. At least one ring has a first recess with side walls for receiving the least one ball, and the friction surface is configured to displace in a radial direction when the at least one ball is axially aligned with the first recess and forced to run up the side walls by rotating the rings relative to one another. In an example embodiment of the invention, the first recess is a calotte.

Abstract: A wave spring holding structure includes a wave spring that includes crest portions and recessed portions that are alternately formed in a circumferential direction thereof, and a first gap; a circular member provided to be rotatable around an axis; and an arc-shaped snap ring that includes a second gap, and that restricts movement of the circular member in a direction of the axis. The wave spring and the snap ring share the axis with the circular member. The wave spring and the snap ring are rotatable with respect to each other. The wave spring is disposed and held between the circular member and the snap ring so that the crest portions protrude toward the circular member, and the recessed portions protrude toward the snap ring. The first gap is formed in one of the crest portions.

Abstract: A clutch 44 has a clutch boss 441, a clutch housing 442, a friction plate 64, a clutch plate 65, and a pressure plate 450. The clutch boss 441 is attached to the main shaft 41 so as to be integrally rotated therewith. The clutch housing 442 encloses the periphery of the clutch boss 441 and is attached to the main shaft 41 so as to be rotated with respect to the main shaft 41. The friction plate 64 has a plate main body and a friction material and rotates together with the clutch housing 442. The clutch plate 65 faces the plate main body via the friction material and rotates together with the clutch boss 441. The pressure plate 450 rotates together with one of the clutch boss 441 the clutch housing 442 which is engaged with the friction plate 64.

Abstract: A torque transmitting apparatus includes a cover portion generally defined by a first axis. The cover portion includes a plurality of adjustment apertures. The apparatus also includes a flywheel coupled to the cover portion for rotation therewith, wherein the flywheel is restrained from axial movement relative to the cover portion. The apparatus also includes a pressure plate coupled to the cover portion for rotation therewith. The pressure plate is axially moveable relative to the cover portion. The apparatus also includes a clutch disk at least partially interposed between the flywheel and the pressure plate. The apparatus also includes a plurality of first members extending between the pressure plate and the cover. Each first member exerts a biasing outward radial force on the adjustment aperture to resist axial movement therebetween. A portion of the first member exerts a biasing axial force on the pressure plate thereby biasing the pressure plate toward the flywheel.

Abstract: An electromagnetic clutch includes an electromagnetic coil positioned within a coil housing. A pulley rotates relative to the housing and the coil. A shaft is rotatably supported by the housing. A hub plate is fixed for rotation with the shaft. A floating element is positioned between the pulley and the hub plate. An elastomeric ring is mounted between the pulley and the floating element and provides a driving connection therebetween. The elastomeric ring is sized to urge the floating element into frictional driving engagement with the hub plate and is compressible during energization of the coil to decouple the floating element from the hub plate.

Abstract: Conveyor rolls used in high temperature applications, and an end cap assembly for such rolls. The conveyor roll comprises a ceramic spool, an end cap and a tolerance ring. The end cap contains a metal ferrule and has an internal circumference adapted to fit over an end of the ceramic spool. A tolerance ring is interposed between each end of the ceramic spool and the end cap. The tolerance ring is composed of resilient metal having a plurality of circumferentially arranged corrugations. The conveyor roll can resist temporary overheating or blockage without damage.