English-Thai Dictionary

ratchet

N เฟือง ซึ่ง มี สปริง สับ ทำให้ หมุน ไป ทางเดียว  sprocket cogwheel fuang-sueng-me-sa-ping-sab-tam-hai-muan

 

Webster's 1828 Dictionary

RATCH

n.In clock work, a sort of wheel having twelve fangs, which serve to lift the detents every hour and thereby cause the clock to strike.

 

RATCHET

n.In a watch, a small tooth at the bottom of the fusee or barrel, which stops it in winding up.

 

RATCHIL

n.Among miners, fragments of stone.

 

Webster's 1913 Dictionary

RATCH

RATCH Ratch, n. (Zoöl.)

 

Defn: Same as Rotche.

 

RATCH

Ratch, n. Etym: [See Rack the instrument, Ratchet. ]

 

Defn: A ratchet wheel, or notched bar, with which a pawl or chick works.

 

RATCHEL

RATCHEL Ratch "el, n.

 

Defn: Gravelly stone. [Prov. Eng. ]

 

RATCHET

Ratch "et, n. Etym: [Properly a diminutive from the same word as rack: cf. F. rochet. See 2d Ratch, Rack the instrument. ]

 

1. A pawl, click, or detent, for holding or propelling a ratchet wheel, or ratch, etc.

 

2. A mechanism composed of a ratchet wheel, or ratch, and pawl. See Ratchet wheel, below, and 2d Ratch. Ratchet brace (Mech. ), a boring brace, having a ratchet wheel and pawl for rotating the tool by back and forth movements of the brace handle. -- Ratchet drill, a portable machine for working a drill by hand, consisting of a hand lever carrying at one end a drill holder which is revolved by means of a ratchet wheel and pawl, by swinging the lever back and forth. -- Ratchet wheel (Mach. ), a circular wheel having teeth, usually angular, with which a reciprocating pawl engages to turn the wheel forward, or a stationary pawl to hold it from turning backward.

 

Note: In the cut, the moving pawl c slides over the teeth in one direction, but in returning, draws the wheel with it, while the pawl d prevents it from turning in the contrary direction.

 

New American Oxford Dictionary

ratchet

ratch et |ˈraCHit ˈrætʃət | ▶noun 1 a device consisting of a bar or wheel with a set of angled teeth in which a pawl, cog, or tooth engages, allowing motion in one direction only. • a bar or wheel that has such a set of teeth. 2 a situation or process that is perceived to be deteriorating or changing steadily in a series of irreversible steps: a one-way ratchet of expanding entitlements. ▶verb ( ratchets, ratcheting, ratcheted ) [ with obj. ] 1 operate by means of a ratchet. 2 (ratchet something up /down ) cause something to rise (or fall ) as a step in what is perceived as a steady and irreversible process: the Bank of Japan ratcheted up interest rates again. ORIGIN mid 17th cent.: from French rochet, originally denoting a blunt lance head, later in the sense ‘bobbin, ratchet ’; related to the base of archaic rock ‘quantity of wool on a distaff for spinning. ’

 

Oxford Dictionary

ratchet

ratchet |ˈratʃɪt | ▶noun 1 a device consisting of a bar or wheel with a set of angled teeth in which a pawl, cog, or tooth engages, allowing motion in one direction only. • a bar or wheel that forms part of a ratchet. 2 a situation or process that is perceived to be changing in a series of irreversible steps: the upward ratchet of property taxes. ▶verb ( ratchets, ratcheting, ratcheted ) [ with obj. ] 1 operate by means of a ratchet. 2 (ratchet something up /down ) cause something to rise (or fall ) as a step in what is perceived as an irreversible process: the Bank of Japan ratcheted up interest rates again. ORIGIN mid 17th cent.: from French rochet, originally denoting a blunt lance head, later in the sense ‘bobbin, ratchet ’; related to the base of archaic rock ‘quantity of wool on a distaff for spinning ’.

 

Sanseido Wisdom Dictionary

ratchet

ratch et ratch /rǽtʃɪt //rætʃ /名詞 C 1 〘機 〙つめ車, ラチェット 〘一方向へのみ回転する歯車 〙.2 ｟主に英 ｠改善の見込みのない状況 .動詞 自動詞 〈つめ車を持つ機械などが 〉カチッと音をたてる .他動詞 1 (つめ車を持つ機械などに )〈物 〉をかます, 入れる .2 〈物 〉を徐々に上げる (up ), 徐々に下げる (down ).