First of all, whether writing an invention patent or a utility model patent, the content requirements are different.
The claim should be as detailed as possible, and the description of the structural features and positional relationship of the patent must be clear. Only when the content is specific can rights be safeguarded. It was suggested that:
Explain the relationship between 4 and 1, 2 and 3;
The structure of the yield ring (2) should be further clarified.
The perspective view of the engineering drawing does not match the text description.