Requirements for drawings of utility models.
1. Drawing tools including computer and black ink shall be used. The lines shall be uniform, clear and deep enough, and shall not be colored or altered. Engineering blueprints shall not be used.
2. The sectional view shall indicate the direction and layout of the sectional view.
3. The distance between section lines shall be suitable for the section size, and shall not affect the neatness of drawings (including reference marks and scribing leads).
All parts in the picture should be drawn in proportion.
5. The size and clarity of the attached drawings should ensure that when the drawings are reduced to two thirds, all the details in the drawings can still be clearly distinguished to meet the requirements of copying and scanning.