Lesson%20Objectives

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Lesson Objectives

• Introduction To -
• Types Of Motion
• Linkages

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Types Of Motion
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Linear Motion
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Rotary Motion
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Reciprocating Motion
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Oscillating Motion
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Linkages

• What is a linkage ?
• How are they used ?

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Before Starting With Linkage Kits
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REVERSE MOTION LINKAGE
As the top rod moves to the left the bottom rod
moves to the right. The bars move in opposite
directions. Another way of describing this
linkage is the direction of movement in one rod
is reversed in the other rod. The fixed pivot is
the centre of rotation.
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Walking Mechanism
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PARALLEL MOTION LINKAGE
As the large rod at the top of the diagram moves
to the left the two small rods at the bottom move
to the right. All the rods are parallel to each
other.
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PARALLEL MOTION LINKAGE
TOOL BOX DRAWS When the lid of the tool box is
opened an extra set of draws can be 'unfolded'.
This allows more tools to be stored.
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PARALLEL MOTION LINKAGE
In 1784 Watt found a solution to his engine
problems (which he called "parallel motion") that
was developed in several different
configurations.
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CRANK AND SLIDER LINKAGE
The rods move forwards and backwards in slider.
The fixed pivot anchor the linkages to one place.
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CRANK AND SLIDER LINKAGE
The crank which is the rotating disc, the slider
which slides inside the tube and the connecting
rod which joins the parts together. As the slider
moves to the right the connecting rod pushes the
wheel round for the first 180 degrees of wheel
rotation. When the slider begins to move back
into the tube, the connecting rod pulls the
wheel  round to complete the rotation.
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BELL CRANK LINKAGE
This linkage allows horizontal movement to be
converted to vertical movement. It also works the
opposite way round. A practical example of this
is the brake mechanism on a bicycle.
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BELL CRANK LINKAGE
BICYCLE BRAKES Look at the diagram carefully. As
the brake lever on the bike is pulled the cable
moves upwards and forces the brake blocks against
the rim of the wheel. Explain the type of linkage
involved - using notes and diagrams. Look at the
page 'linkages' to help you decide.
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BELL CRANK LINKAGE
From the SafeAir1 glider wing pushrod on the
aileron. Clear use of a bell crank
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Windscreen Wipers
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Design a linkage to solve this problem You
cannot cross the wall
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One Answer
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Free Linkage Software
http//www.edu-ctr.pref.kanagawa.jp/LinkWeb/index_
e.htm