lever


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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 ?
338 Marlin Express is the most versatile cartridge ever offered in a traditional lever action.
Put the locking block back in, making sure the slide stop lever spring is flush with the locking block.
The application further says that FIRs have been lodged against lever transplant mafia in police stations Aabpara and Bhara Kohou respectively and now this group has been transformed into dangerous gang as some foreign figures hailing from Arab countries are included in it.
Within a pair the first value represented the probability of setting up a food pellet in the left lever, and the second value the probability of setting up a food pellet in the right lever.
For both lever-propulsion systems, the levers can be disengaged to allow the option of using the hand rims for propulsion.
The Leverhulme collection was put together by Lever and his son William Hulme Lever, 2nd Viscount Leverhulme.
Almost immediately we all realized that the lever to deactivate the lock on the holster needed to be moved, and the people from Blackhawk were quick to indicate that the design change was already in the works.
Officers descended on Canley Cemetery where they spotted Lever and he was arrested after more than six months on the run.
In 1930, the Lever Brothers merged with Margarine Unie in 1930 to form Unilever.
Polished and satin stainless steel versions of these levers are available on exit devices, tubular and mortise locks, as well as access control and electromechanical products.
After removing the padlock from the lock lever, don't kick the lever to open the hatch.