| 释义 |
head-block|ˈhɛdblɒk|
†1. A log put at the back of the chimney to keep the fire in by night: cf. head-brand in head n.1 74.
1642Fuller Holy & Prof. St. v. xix. 439 These Nether⁓lands being like the head-block in the chimney, where the fire of warre is alwayes kept in (though out every where else).
2. In a saw-mill: The device for holding the log upon the carriage, while it is sawn.
1864Webster, Head-block (Saw-mill), the movable cross⁓piece of a carriage on which the log rests. 1878Sci. Amer. XXXVIII. 291 An improved head block..for saw mills.
3. The piece which connects the wheel-plate or ‘fifth wheel’ of a carriage with the fore-body.
1875in Knight Dict. Mech. 1884Ibid. Suppl., Head Block Plate (Carriage), an iron resting on the fore-axle and supporting the head block.
4. (See quot. 1905.)
1853Trans. Mich. Agric. Soc. IV. 35 G. S. Snyder, Lancaster O. improved head block for setting logs on saw mills. 1905Terms Forestry & Logging 39 Head block, the log placed under the front end of the skids in a skid⁓way to raise them to the desired height. |