Ratchet

(noun.) mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction.

(verb.) move by degrees in one direction only; 'a ratcheting lopping tool'.

乔治娜手打

• Upon it was mounted a broad ratchet-wheel with a crank, while into the teeth of the wheel there played a stout, elastic slab of wood. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.
• In this the high wheel was behind and the small one in front, and straps and ratchet wheels connected the pedals to the axle. Edward W. Byrn. 十九世纪发明进展.
• One was used in connection with the propelling lever, which was provided with a pawl to fit into the teeth of the reversed ratchet wheel on its forward movement. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.
• It printed upon a sheet of paper supported on a roller, carried in a sliding frame worked by a ratchet and pawl. Edward W. Byrn. 十九世纪发明进展.
• Each shaft with its dial was provided with two ratchet wheels, one the reverse of the other. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.
• The box mechanism is usually of the ratchet, step-by-step movement, familiar in district messenger call-boxes. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.
• Finger pawls, working into ratchets at the ends of the roller, serve to rotate it after each line is printed. Edward W. Byrn. 十九世纪发明进展.
• Bolts or ratchets are inserted through the rail, and clamp the cushion to the wall of the rail. 佚名. 神奇的知识之书.
• So they attached levers, pulleys, ratchets and windlasses, until at last they reached the size of the great siege cross-bows, weighing eighteen pounds. 佚名. 神奇的知识之书.

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