Connection in patent

The specific connection method must be clearly written in the patent specification and claims, otherwise the specification will not be fully disclosed.

As you said, there are two ways, one is that the two parts are connected through a certain connection mode, so the specific connection mode should be defined, and the connection cannot be written only;

If it is a whole, there is no need to write a connection. Just describe what kind of structural integrity they are.

To protect both, it can be written as "1 and 2 are two parts of ..."