About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators. A bell-crank lever consists of a long arm, 8 1 2 in. Long, and a short arm 4 in. Long, at right angles to each other. Calculate the force to be applied at right angles to the end of the long arm to overcome a resistance of 40 lbf acting at 30° to the vertical of the short arm. Video Lecture on Problem on Bell Crank Lever from Design of Cotter Joint, Knuckle Joint,Levers and Offset Links Chapter of Design of Machine for Mechanical. Abstract - Bell Crank Lever is important components from safety point of view since they are subjected to large amount of stresses. Hence to study the stress pattern in bell crank lever, analytical, numerical and photoelasticity methods are used. For analysis purpose virtual model of bell crank lever is prepared.

• Suspension Bell Crank
• Bell Crank Design
• Bell Crank Mechanism

What is a lever?

A lever is a rigid bar that pivots about a fulcrum. It transmits an input motion and force, (the effort) through the lever pivoting on a fulcrum to a resistance force called a load.

Load

The load is anything that is being moved by a lever.

Effort force

The effort force is the energy applied to a lever to move a load.

Fulcrum

The fulcrum is the point at which the lever pivots. A lever may rest on a fulcrum or it may swivel on an axle, e.g. a see-saw (class 1 lever) and a wheel barrow (class 2 lever).

Classes of lever

There are three classes of levers. Each class of lever has the load and effort force in specific positions relative to the fulcrum.

Suspension Bell Crank

Class 1 lever

A Class 1 lever has the fulcrum between the load and the effort force.

Class 2 lever

Bell Crank Design

A Class 2 lever has the load between the fulcrum and the effort force.

Class 3 lever

A Class 3 has the effort force between the load and the fulcrum.

Bell Crank Mechanism

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