I would have to say that is an 'l' -shaped bracket.
我不得不说，这是一个“L”状的支架。
The end of the upper cover is connected with the U-shaped bracket by a shaft, which is used for applying the force on the upper cover by users and then transferring the force to the punch.
上盖，其末端与此U型支架相轴接， 用来让使用者施力于此上盖上再将力传递至此冲子；
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