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SYSTEMS PREPARATION QUESTIONS 2008 - 4

V. Ryan 2008

 

A second version of the clown model has been manufactured (see previous question). This is mechanically operated by a rotating device.

 
Draw the mechanical device on the diagram above
 

ANSWER

What is the function of the pivot ?

 
 
 
 

ANSWER

 
     

The pivot allows the barrier to rotate at a specific point. In this case the barrier rotates upwards and downwards about the pivot.

 
   
Name the device and explain how it works.
DEVICE NAME: _________________________________________
How it works;
ANSWERS
DEVICE NAME: Eccentric Cam
How it works:

As the eccentric cam rotates in a clockwise direction the barrier is pushed upwards at a constant rate. It then descends at a constant rate back to its original position.

What is the function of the spring ?

ANSWER

What is the function of the spring ?

The spring returns the arms to a level position when the eccentric cam has dropped to its lowest position. It also helps ensure that the motion of the entire mechanism is smooth.

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