WHAT IS KNUCKLE JOINT?
- A knuckle joint is used to connect two rods which are under the action of tensile forces when a small amount of flexibility or angular moment is necessary. It is basically a tensile joint. However, if the joint is guided, it may support a compressible load. This joint can be readily disconnected for adjustments or repairs.
- Link of a roller chain,
- Tension link in a bridge structure,
- Tie rod joint of roof truss, and
- Tie rod joint of jib crank, etc.
- Components of the knuckle joint:
- Eye and fork: The end of one rod is formed into an eye of another rod is formed into a fork ( or a double eye) with an eye in each of the fork leg. The eye is inserted into the fork and the holes in the eye and fork are aligned.
- Knuckle pin: The knuckle pin is inserted through the fork and eye. The knuckle pin has a head at one end and at the other end it is secured by a collar and a taper pin or split pin.
- Material for knuckle joint :
- Plain carbon steel or alloy steel.
- Why the knuckle pin is made of weaker material? :
Many times, the knuckle pin is made of weaker material as compared to a single eye and fork. This is due to the fact that the cost of a knuckle pin is less as compared to the single eye and fork. Hence, if at all there is a failure, the knuckle pin should fail instead of a single eye and fork.
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