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各位大侠:1 O4 w! p8 i% e, ? B% T
这个 “knockouts”是什么东东?见过的同学放张图片上来看看。
7 S, h; L: f& ^ 41 Tests on knockouts( [8 J0 o5 r8 i9 `) O
41.1 A force of 10 lbs (4.5 kg) shall be applied to a knockout for 1 minute by means of a 1/4 in (6.4 mm)
9 L1 l6 p0 z! a, f& E. \diameter mandrel with a flat end. The force is to be applied in a direction perpendicular to the plane of the6 t4 n2 [) v' @( A) f+ R- b' a/ J' }: j
knockout and at the point causing movement. The knockout shall remain in place and the clearance! s0 T/ Y' \" w% \; S5 s
between the knockout and the opening shall be no more than 0.063 in (1.6 mm) measured after the force
+ k+ H$ V# A' h0 O) S9 L: ?has been removed.
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7 @" V2 I, d# m8 _3 }" g; I# S谢谢!* ^& \3 \1 S* T
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