INVERSIONS

INVERSIONS

INVERSIONS OF FOUR BAR CHAIN MECHANISM

Inversion means getting different mechanism by fixing different links of four bar chain mechanism1 inversion this inversion is obtained by fixing 1st link2nd link acts as a crank3rd link is acts as a coupler4th link acts as a rocker1 INVERSION

2nd inversionBy fixing 2 link the second inversion is obtained in which1 & 3 link acts as a crankLink 4 acts as a coupler The mechanism so obtained is known as crank-crank or double crank

3rd inversionBy fixing link 3 the 3rd inversion is obtained in which Link 1 acts as a coupler Link 2 acts as a crankLink 4 acts as a rocker

4th inversionBy fixing 4 link the 4th inversion is obtained in which Link 1 & 3 acts as a rocker Link 2 acts as coupler

SLIDER CRANK CHAINWHEN ONE OF THE TURNING PAIRS OF A FOUR BAR CHAIN IS REPLACED BY A SLIDING PAIR, IT BECOMES A SLIDER CRANK MECHANISM

INVERSION OF SLIDER CRANK MECHANISMFIRST INVERSIONTHIS INVERSION IS OBTAINED WHENLINK 1 IS FIXED WHERELINK 2 ACTS AS A CRANK LINK 4 ACTS AS A SLIDER

SECOND INVERSIONTHIS INVERSION IS OBTAINED WHEN LINK 2nd IS FIXED LINK 3 ALONG WITH THE SLIDER ACTS AS A CRANK

APPLICATIONS ARE-1.WHITWORTHQUICK RETURN MECHANISM2.ROTARY ENGINEIT IS A MECHANISM USED IN WORKSHOPS TO CUT METALSFORWARD STROKES TAKES A LITTLE LONGER AND CUTS TWHITWORTH QUICK RETURN MECHANISMH METAL WHEREAS THE RETURN STROKE IS IDLE AND TAKES A SHORTER TIME

ROTARY ENGINELINK 2 IS FIXED LINK 3 IS ROTATED DUE TO PISTON MOVEMENT DUE TO THE ROTATION OF LINK 3 ,LINK 1 ROTATES ABOUT O

ROTARY ENGINE

THIRD INVERSIONTHIS INVERSION IS OBTAINED WHEN LINK 3 IS FIXED LINK 2 ACTS AS A CRANKLINK 4 ACTS AS A ROCKER OR OSCILLATOR

LINK 1 ACTS AS A COUPLER

OSCILLATING CYLINDER ENGINELINK 4 IS MADE IN THE FORM OF CYLINDER PISTON IS FIXED TO THE END OF LINK1THE PISTON RECIPROCATES INSIDE THE CYLINDER PIVOTED TO THE LINK 3 WHEN THE PISTON RECIPROCATES IN THE CYLINDER ,THE CRANK ROTATES

OSCILLATING CYLINDER ENGINE

CRANK AND SLOTTED LEVER MECHANISMIF THE CYLINDER OF AN OSCILLATING CYLINDER ENGINE IS MADE IN THE FORM OF A GUIDE AND THE PISTON IN THE SLIDERLINK 3 IS FIXEDLINK 2 ACTS AS CRANKLINK 5 IS A LEVER

FOURTH INVERSIONIN THIS LINK 4 IS FIXEDLINK 3 ACTS AS A OSCILLATES ON LINK 4WHICH MAKES THE LINK 2 TO OSCILLATES ALONG THE AXIS OF THE FIXED LINK 4APPLICATION: HAND PUMP

HAND PUMPLINK 4 IS MADE IN THE FORM OF A CYLINDERPLUNGER FIXED TO THE LINK 1 RECIPROCATES IN IT. IF LINK 4 OF THE SLIDER CRANK MECHANISM IS FIXED ,THE FOURTH INVERSION IS OBTAINEDLINK 3 CAN OSCILLATE ABOUT THE FIXED PIVOT B ON LINK 4.THIS MAKES END A OF THELINK 2 TO OSCILLATE ABOUT B AND END O TO RECIPROCATE ALONG THE AXIS OF THE FIXED LINK 4

DOUBLE SLIDER CRANK MECHANISMA FOUR BAR CHAIN HAVING TWO SLIDING AND TWO TURNING PAIRS SUCH THAT TWO PAIRS OF THE SAME KIND ARE ADJACENT IS KNOWN AS A DOUBLE SLIDER CRANK MECHANISM

FIRST INVERSIONTHIS INVERSION IS OBTAINED WHEN LINK 1 IS FIXED ADJACENT PAIRS 23,34 ARE TURNING PAIRSTHE OTHER TWO PAIRS 12,14 ARE SLIDING PAIRSAPPLICATION: ELLIPTICAL TRAMMEL

ELLIPTICAL TRAMMEL

SECOND INVERSION IF ANY OF THE SLIDE BLOCKS OF THE FIRST INVERSION IS FIXED, THE SECOND INVERSION IS OBTAINEDLINK 4 IS FIXED, END B OF CRANK 3 ROTATES ABOUT ALINK 1 RECIPROCATES IN THE HORIZONTALAPPLICATION :SCOTCH YOKEA SCOTCH YOKE IS A DEVICE WHICH IS USED TO CONVERT ROTARY MOTION INTO SLIDING MOTION

SCOTCH YOKE

THIRD INVERSIONTHIS INVERSION IS OBTAINED WHEN LINK 3 OF THE FIRST INVERSION IS FIXEDLINK 1 IS FREE TO MOVETHIS INVERSION IS USED TO CONNECT LINK 2 AND 4IF THE ROTATING LINKS 2 &4 OF THE MECHANISM ARE REPLACED BY TWO SHAFTSONE ACTS AS A DRIVER AND ANOTHER AS A DRIVEN SHAFTS WITH THEIR AXESTHEY ARE USED TO CONNECT TWO SHAFTS WHEN THE DISTANCE B/W THEM IS SMALLAPPLICATION : OLDHAMS COUPLING