stand-by relief hole 备用救援井
There is Burst disk pressure in the gauge, blow out hole in the back to relief the presure inside caused by failure of elastic element.
背部，设有泄压后盖及泄压孔，以释放因过载弹性元件破裂而产生的内部压力，增强了人员及设施的安全性。
The bedpan is close to the relief hole by lifting the lifting component, which is convenient for patients to use. Holding the bedpan manually is not needed.
通过升降件的升降，使便盆接近方便孔，方便病人的使用，无须人工用手托便盆。
Panel will be formed when restrike if shape relief exsit by cam pierce . To be kept punch upper shape. (Same as bolting hole).
＊ 整形时，如果同时存在斜楔冲孔，因凸模表面逃料制件将发生变形（螺钉孔同样）。 凸模表面逃料要避免。
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