lever

(redirected from levers)
Also found in: Dictionary, Thesaurus, Legal, Encyclopedia.
Related to levers: Simple Machines

lev·er

(lev'ĕr, lēv'),
An instrument used to lift or pry.
[Fr. lever, to lift]

lever

[lē′vər, lev′ər]
Etymology: L, levare, to lift up
any one of the numerous bones and associated joints of the body that act as a simple machine so that force applied to one end of the bone tends to rotate the bone in the direction opposite from that of the applied force. The muscles of the body produce the forces that move the levers. The basic components of a lever are the fulcrum, the force arm, and the weight arm. A first-class lever, such as the joint between the base of the skull and the first cervical vertebra, has a fulcrum between the weight and the applied force. The body contains few second-class levers, which have the weight between the fulcrum and the force. A third-class lever, such as the forearm and elbow, has the force between the fulcrum and the weight. The body uses its third-class levers for speed and its first-class levers for either force or speed, depending on the force applied to the weight arm.

lev·er

(lev'ĕr)
An instrument used to lift or pry.
[Fr. lever, to lift]

lever (lev´ur),

n a bar or rigid body that is capable of turning about one joint or axis and in which are two or more other points where forces are applied. There are three classes of levers, and each has its own most effective use.
lever leverage
n the mechanical advantage gained by the use of a lever. A factor in the magnification of stresses generated by an extension-base partial denture.
lever, second-class,
n a lever in which the force arm is longer than the work-producing arm; thus the work produced is always greater than the energy used, with a resultant high efficiency.
lever, third-class,
n a lever in which the axis is at one end, the load at the other end, and the effort is exerted in between, as in a treadle.
References in periodicals archive ?
Sources said that farmers had been asked to submit applications for installation of levers and added that the gadgets would be installed free-of-cost in the selected plots.
Instead of taking stern action against lever transplant mafia, the officials of FIA including Inspector Asghar Baloch and constable Dost Mohammad have become the part of that gang after receiving Rs 5 million cash, luxury vehicle and other valuables from the gang, the application added.
Food deliveries in the left and right levers were scheduled using seven pairs of probabilities: 0.
By the time police arrived, Levers had suffered a heart attack and was unconscious.
Lever-propelled wheelchairs are designed with manually operated push levers that transfer force to the wheels through a transmission mechanism.
The locking mechanism of the Grip-Break impinges on the inside of the pistol's trigger guard just as the Serpa does, but instead of the user deactivating it with the trigger finger, the lock is controlled by a paddle lever on the inboard side of the pistol.
Customers disarmed Levers and held him on the floor while others raised the alarm, Devon and Cornwall Police said.
Sargent Studio Collection, which provides designers, architects, and end-users with decorative options, includes RAG and RGM levers.
Most of the levers were purged at the manufacturing facility, but it's possible that a few may have been installed.
Moving from flight range to ground range requires relatively long upward travel of the power levers.
Pushing forward on the levers provides up to a 4-to-1 mechanical advantage, and pulling back ratchets and resets the drivetrain for the next power stoke.
Flip either of the ambidextrous levers down and hold for momentary-on.