1. Mini project

2.  Abhishek Prasad
MECH A

3.  A four bar chain is the most fundamental of the
plane kinematic chains. It is preferred as a
mechanical device for the mechanism and
control of motion due to simplicity and
versatility.
 They are connected in the form of quadrilateral
by four pin joint.

4.  A LINK can be defined as a member or a
combination of members of a mechanism,
connecting other members and having relative
motion among them.
 Generally the linkages are
 1st fixed link
 2nd connecting link
 3rd crank link
 4th rocker

5.  FOUR BAR CHAIN
b
c
a d

6.  Generally we are having the same linkages
combination as shown in video its working...
 Two wheels are placed with the correct ratio of
dia.. Or expected ratio...
 1st is driving wheel may connected to small
motor or rotated by human effort.
 2nd driven wheel or flywheel connected with
belt to driving wheel and also having crank link
connected to the outer rim of wheel.

7.  FIXED LINK
 It act as a supporting link which is fixed to the
basement, as it also provides the required
movement of rocker arm as shown in video...
 Generally the fixed link supports the motion
also with the help of external links it controls
the motion along a direction.

8.  CRANK
 It is a link which rotate with the rotation of
360degree at one end linked with connecting
rod and other to the wheel as seen in video...
 As the wheel rotate the crank rotate and
transmit the rotating power to the connecting
link for further transmission and give out an
output.

9.  CONNECTING ROD
 As seen in diagram it act as link which transmit
the motion forward to the rocker arm as it is
linked with crank arm.
 The rotation of crank gives the motion to the
connecting rod such as oscillating or to and fro
with oscillation.

10.  ROCKER ARM OR ROCKER LINK
 As the motion is transmitted from connecting
rod the rocker arm further transmit the motion
to the final output.
 The motion can be the reciprocating or to and
fro, as per the requirement of application.

11.  Generally this four bar chain mechanism is
having lots of application
 deep boring machines
 In locomotives
 hand pump
 Crank and slider mechanism used in lathes..