TOM(Four-bar chain mechanism)

FOUR- BAR CHAIN MECHANISM:- 
A four bar link mechanism or linkage is the most fundamental of the plane kinematics linkages. It is a much preferred mechanical device for the mechanization and control of motion due to its simplicity and versatility.

Fig.1.1, Four bar chain.

This type of mechanism contains all four pairs as turning pairs.
In four bar mechanism, one of the rotating link is known as crank or driver and the other link as follower or rocker. the member connecting the crank and the follower is known as connecting rod.(see fig. 1.1)

INVERSIONS OF FOUR CHAIN MECHANISM:-

1.COUPLED WHEELS OF LOCOMOTIVE:-
In coupled wheels of locomotive mechanism, links 1 and 3 works as crank(shown in the fig. 1.2) .the link 4 is fixed. The opposite links in mechanism are equal in length.Due to two cranks this mechanism is also known as double crank mechanism

Fig. 1.2 Coupled locomotive.

This type of mechanism is used in the train wheels.(as shown below)

eg. of coupled wheels of locomotive

2.BEAM ENGINE:-
Beam engine mechanism is used to convert rotary motion into reciprocating one. This mechanism is used in beam's steam engines. so it is called as beam engine mechanism.

BEAM ENGINE ANIMATIONS

3. PANTOGRAPH:- Pantograph is a device used to reproduce a displacement in a reduced or enlarged scale. Pantograph is used to for duplicating drawings maps etc.

The links connected in pantograph together such that, they form parallelograms. Due to this identical output of the links is obtained.

Acc. to the geometry of the fig(1.3)=  AC/AC"=AE/AE"

PANTOGRAPH ANIMATION

WATT MECHANISM:-

This mechanism is invented by watt for his steam engine to guide the piston rod. 

In this mechanism the center pt. p(shown in fig 1.4.) of the linkage travel along a approximate st. line.

Fig.1.4 Watt mechanism

Watt's mechanism is used in 1998 Ford Ranger EV.(SHOWN BELOW)

THIS IS ALL ABOUT THE FOUR CHAIN MECHANISM. SHARE COMMENT AND LIKE....