标题: UL1838 [打印本页] 作者: 520168 时间: 2014-1-13 11:18 标题: UL1838 各位大侠: 5 ]" W g- f% q% r6 m% v2 y 这个 “knockouts”是什么东东?见过的同学放张图片上来看看。 ! v: i9 n. ^2 x. s' ^0 o7 x' f 41 Tests on knockouts ) K7 j0 }! d% ?4 x9 `; V& T41.1 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)0 `) H4 H' A( c/ _. A% ]& @, S
diameter mandrel with a flat end. The force is to be applied in a direction perpendicular to the plane of the 4 y3 T F0 s2 h7 |) \' Vknockout and at the point causing movement. The knockout shall remain in place and the clearance) ]0 ^; W$ \; S" W
between the knockout and the opening shall be no more than 0.063 in (1.6 mm) measured after the force ' Q( E* e, I( V, b4 W5 }has been removed. - H+ d/ ^" u) d1 |7 W3 Q) x ; k* S# ]3 e6 _; A4 `2 s/ k谢谢!6 H1 i2 V! }5 D- t! Q. f) s, L$ } 作者: Nezof 时间: 2014-1-13 11:34
顶杆 ) n6 d. B$ X1 o4 |解释:1.被打入某些物体中的薄壁管(如以后将灌入混凝土的管形钢柱)内的临时内支柱。2.一种用来顶出已成型工件的棒。3.穿入【金属】型腔背面的销杆,用以顶出制成件。4.早期来复枪枪管尾端中的细钢杆,弹丸由推弹杆撞入顶住钢杆并配合来复线塞紧。 * N9 q2 ~" S- F& K2 N6 R! `% v( j作者: Nezof 时间: 2014-1-13 11:35
一般遇到这种情况,在顶杆的末端会加一个弹性卡簧,且不易造成脱落作者: Nezof 时间: 2014-1-13 11:43
来个图你看看吧) d& Z' O1 g. m
[attach]84766[/attach][attach]84765[/attach] * Z( v& a* W- B, k% v作者: 依然 时间: 2014-1-14 14:07
灯具上Knock Out 常见于接线盒上,又叫预冲孔,敲一下会打开的,一般用于电管安装,如图:$ }0 e. x8 n) R" Z: q9 [- b& M4 W& x
[attach]84791[/attach] 4 M/ z3 U6 w A