#simple_machine__machine a device for overcoming resistance at one point by applying force at some other point
supertype: mechanical_device mechanism consisting of a device that works on mechanical principles
subtype: inclined_plane a simple machine for elevating objects; consists of plane surface that makes an acute angle with the horizontal
subtype: ramp__incline an inclined surface or roadway that moves traffic from one level to another
subtype: ski_jump__skijump a steep downward ramp from which skiers jump
subtype: screw.inclined_plane a simple machine of the inclined-plane type consisting of a spirally threaded cylindrical rod that engages with a similarly threaded hole
subtype: wedge something usable as an inclined plane (shaped like a V) that can be pushed between two things to separate them
subtype: ax_head__axe_head__axehead the cutting head of an ax
subtype: colter__coulter a sharp steel wedge that precedes the plow and cuts vertically through the soil
subtype: moldboard__mouldboard wedge formed by the curved part of a steel plow blade that turns the furrow
subtype: plowshare__ploughshare__share a sharp steel wedge that cuts loose the top layer of soil
subtype: coign__quoin__coigne expandable metal or wooden wedge used by printers to lock up a form within a chase
subtype: shim a thin wedge of material (wood or metal or stone) for driving into crevices
subtype: lever.simple_machine a simple machine that gives a mechanical advantage when given a fulcrum
subtype: pulley-block__pulley__block a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope
subtype: bollock__bullock_block__bullockblock a pulley-block at the head of a topmast
subtype: fairlead a pulley-block used to guide a rope forming part of a ship's rigging to avoid chafing
subtype: snatch_block a pulley-block that can be opened to receive the bight of a rope
subtype: idle_pulley__idler_pulley__idlerpulley__idle_wheel a pulley on a shaft that presses against a guide belt to guide or tighten it
subtype: wheel a simple machine consisting of a circular frame with spokes (or a solid disc) that can rotate on a shaft or axle (as in vehicles or other machines)
subtype: balance_wheel__balancewheel a wheel oscillating against the hairspring of a timepiece to regulate its beat
subtype: bicycle_wheel__bicyclewheel the wheel of a bicycle
subtype: buffing_wheel__buffingwheel a wheel that is covered with soft material
subtype: cartwheel.wheel a wheel that has wooden spokes and a metal rim
subtype: car_wheel__carwheel a wheel that has a tire and rim and hubcap; used to propel the car
subtype: fifth_wheel.car_wheel__spare an extra car wheel and tire
subtype: daisy_print_wheel__daisyprintwheel__daisy_wheel__daisywheel a wheel around which is a set of print characters that make a typing impression on paper
subtype: driving_wheel__drivingwheel a wheel that drives a motor vehicle (transforms torque into a tractive force)
subtype: gear_wheel__gear__cogwheel a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion
subtype: bevel_gear__bevelgear__pinionandcrownwheel__pinion_and_ring_gear gears that mesh at an angle
subtype: differential_gear__differential a bevel gear that permits rotation of two shafts at different speeds; used on the rear axle of automobiles to allow wheels to rotate at different speeds on curves
subtype: escape_wheel gear that engages a rocking lever
subtype: pinion a gear with a small number of teeth designed to mesh with a larger wheel or rack
subtype: lantern_pinion__lanternpinion__lantern_wheel__lanternwheel a small pinion having cylindrical bars instead of teeth, used chiefly in inexpensive clocks
subtype: planetary_gear__planetarygear__epicyclic_gear__epicyclicgear__planet_wheel__planet_gear an outer gear that revolves about a central sun gear of an epicyclic train
subtype: rack_and_pinion a wheel gear (the pinion) meshes with a toothed rack; converts rotary to reciprocating motion (and vice versa)
subtype: spur_gear__spur_wheel gear wheels that mesh in the same plane
subtype: sun_gear__sungear the central gear in a epicyclic train
subtype: worm_gear gear consisting of a shaft with screw thread (the worm) that meshes with a toothed wheel (the worm wheel); changes the direction of the axis of rotary motion
subtype: worm_wheel gear with the thread of a worm
subtype: grinding_wheel__emery_wheel__emerywheel a wheel composed of abrasive material; used for grinding
subtype: handwheel.wheel a wheel worked by hand
subtype: nosewheel a wheel located under the nose of an airplane that is part of the plan's landing gear
subtype: paddlewheel a large wheel fitted with paddles and driven by an engine in order to propel a boat
subtype: potter's_wheel a horizontal rotating wheel holding the clay being shaped by a potter
subtype: ratchet_wheel__ratchetwheel toothed wheel held in place by a pawl or detent and turned by a lever
subtype: roller.wheel a small wheel without spokes (as on a roller skate)
subtype: caster.roller__castor a pivoting roller attached to the bottom of furniture or trucks or portable machines to make them movable
subtype: toothed_wheel__toothedwheel__roulette a wheel with teeth for making a row of perforations
subtype: rowel a small spiked wheel at the end of a spur
subtype: sprocket_wheel__sprocket thin wheel with teeth that engage with a chain
subtype: trundle small wheel or roller
subtype: wagon_wheel__wagonwheel a wheel of a wagon
subtype: waterwheel__water_wheel__waterwheel a wheel that rotates by direct action of water; a simple turbine
subtype: millwheel water wheel that is used to drive machinery in a mill
subtype: noria a water wheel with buckets attached to the rim; used to raise water for transfer to an irrigation channel
subtype: water_wheel__waterwheel__waterwheel a wheel with buckets attached to its rim; raises water from a stream or pond
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