The concept is too big and I can’t really explain it in a sentence or two. . .
If others have not come up with the technical measure of "a heel becomes a stool and a backrest becomes a chair", then you can just write it like this, but the scope is too broad and can easily be invalidated. If someone else Yes, you must describe your combination method in more detail, that is, you must write down your technical characteristics, the lower concept of "a heel surface forms a stool and a backrest forms a chair."
If you have the technical feature of "a heel surface forms a stool and a backrest becomes a chair", it is the patent right of the upper concept, and it also has its lower concept, that is, something or a certain There are patent rights for several connection methods, but others have mentioned a connection method that you have not mentioned, then it depends on whether the connection method is mentioned or implied in your manual. Generally, such issues must be determined through legal means to determine whether there is infringement. If it is mentioned, the chance of winning may be greater. Of course, it also depends on the level of the agent and the judge's decision.
The writing is not detailed, it is for reference only! I also hope to discuss it with everyone!