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