| 释义 |
ˈover-ˈtravel, n.
[over- 29.]
a. Excessive travel, too much travelling.
1856Kane Arct. Expl. I. xxviii. 365 If the rest of my team had not been worn down by over-travel.
b. Movement of part of a machine beyond the desired point; an allowance made for such travel. Freq. attrib.
1923R. Grierson Electr. Lift Equipment xiii. 87 Over⁓travel spaces at both the top and the bottom of the shaft are essential, as the brake is subject to wear. 1939R. S. Phillips Electr. Lifts xii. 177 The top overtravel is defined as the distance provided for the car floor to travel above the level of the top terminal landing before the car is stopped by the ultimate limit switch. 1962E. G. Davies in G. A. T. Burdett Automatic Control Handbk. iii. 21 Series limit switches..are generally employed as emergency over-travel switches not called upon to operate except after the failure of the normal stopping or reversing pilot limit switch. 1977Economist 3 Sept. 50/3 (Advt.), Overflow valves. Overtravel switches. Oxide magnets.
So ˌover-ˈtravel v. [over- 23], (a) refl. to travel or journey beyond one's power of endurance; (b) (see quot. 1909).
1654in F. L. Hawks Hist. N. Carolina (1858) II. 19 The interpreter, with over-travelling himself, fell sick. 1909Cent. Dict. Suppl., Overtravel... In mech., to travel farther than is necessary to do a certain act or perform a definite function. 1955Archit. Rev. CXVII. 143/4 At top and bottom of the well there are Limit Switches which automatically cut off the lift motor in the event of the car overtravelling in either direction. |