| 单词 | safety switch |
| 释义 | > as lemmassafety switch safety switch n. (a) Railways (chiefly U.S.) = catch point n. (now historical); (b) a switch which cuts the power to a machine or appliance in case of emergency. ΘΚΠ the world > matter > physics > electromagnetic radiation > electricity > circuit > device to open or close circuit > [noun] > allowing cut-off safety switch1940 1843 London Jrnl. Arts, Sci., & Manuf. 23 273 The patentee..also claims the safety-switch..in which the moveable rails..are made to slide through different degrees of space. 1940 Chambers's Techn. Dict. 293/2 Emergency stop, a switch installed in a lift-car, or other similar piece of equipment, by means of which the power to the operating motor can be cut off. Also called a safety switch. 1944 Engineering 8 Sept. 192/3 Investigation..revealed that some time previously the safety switch had failed. 1963 E. White & D. J. Wilkie Shays on Switchbacks 10 A safety switch and derail were placed midway down the Hill to divert the train to an up-grade spur should the brakes fail. 1983 in A. G. Adams Hudson through Years (1996) Introd. p. xviii There was a ‘safety switch’ permanently set into a sand pit here in case of runaway cars... After the car passed the switch it would automatically snap back into the sand pit position. 2004 Tool & Machinery Catal. 2005 (Axminster Power Tool Centre Ltd.) ii. 35/3 Upgrade any machine in the workshop that has been supplied without a safety switch. < as lemmas |
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