Types of Joint:

The usual types of joints in a chain are:

Binary Joint

Ternary Joint

Quaternary Joint

Binary Joint:

 If two links are joined at the same connection, it is called a binary joint.

For example, in fig. at joint B

Ternary Joint:

If three links joined at a connection, it is known as a ternary link.

For example point T in fig.

Quaternary Joint:

If four links joined at a connection, it is known as a quaternary link.

For example point Q in fig.