Teaching aid

• Main Authors: CHEN QINGYING, WANG XUEJUN
• Format: Patent
• Language: Chinese; English
• Published: 13.11.2018
• Subjects: ADVERTISING; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND,DEAF OR MUTE; CRYPTOGRAPHY; DIAGRAMS; DISPLAY; EDUCATION; EDUCATIONAL OR DEMONSTRATION APPLIANCES; GLOBES; PHYSICS; PLANETARIA; SEALS

The application discloses a teaching aid. The teaching aid comprises a substrate, a center member and at least two annular members; the lower end surface of the center member and the lower end surfaceof each of the at least two annular members are fixed to the upper end surface of the substrate, the upper end surface of the center member is a spherical surface, and the upper end surface of each of the annular members is a convex surface; the outer diameter and the inner diameter of different annular members in the at least two annular members are different, and the central axes of all the annular members coincide, and the center of sphere of the upper end surface of the center member is located in the central axis of the annular member. The application solves the technical problem that nospecial teaching aid is available for a trainee to perform training. 本申请公开了种教具。所述教具包括基板、中心件和至少两个圆环形件；中心件的下端面和至少两个圆环形件中每个圆环形件的下端面均固定在基板的上端面上，中心件的上端面为球面，每个圆环形件的上端面均为凸曲面；至少两个圆环形件中不同的圆环形件之间的外径和内径均不相同，且每个圆环形件的中轴线重合，中心件的上端面的球心位于圆环形