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Ratchet drills.

Drill

Ratchet drills.

A portable hand drill.

Ratchet Drill

A portable hand drill.

"A front view of a common English house clock with the face taken off, showing the repeating or rack striking movement. Here, M is the hourwheel on the pipeof which the minute-hand is set, N the reversed hour-wheel, and n its pinion, driving the 12-hour wheel H, on whose socket is ficed what is called the snail Y, which belongs to the striking work exclusively. The hammer is raised by the eight pins in the rim of the second wheel in the striking train, in the manner which is obvious." — Encyclopedia Britanica, 1893

English House Clock

"A front view of a common English house clock with the face taken off, showing the repeating or rack…

"E represents the scape-wheel turning in a minute, and e its pinion, which is driven by the wheel D having a pinion d driven by the wheel C, which we may suppose to turn in an hour. The arbors of the scape-wheel and hour-wheel are distinct, their pivots-meeting in a bush fixed somewhere between the wheels. The pivots of the wheel, D are set in the frame AP, which rides on the arbors of the hour-wheel and scape-wheel, or on another short arbor between them. The hour-wheel also drives another wheel G, which again drives the pinion f on the arbor which carries the two arms f A, f B; and on the same arbor is set a fly with a ratchet, like a common striking fly, and the numbers of the teeth are so arranged that the fly will turn once for each turn of the scapewheel. The ends of the remontoire arms f A, f B are capable of alternately passing the notches cut half through the arbor of the scape-wheel, as those notches successively come into the proper position at the end of every half minute; as soon as that happens the-hour-wheel raises the movable wheel D and its frame through a small angle; but nevertheless, that wheel keeps pressing on the scape-wheel as if it were not moving, the point of contact of the wheel C and the pinion d being the fulcrum or center of motion of the level A d P." — Encyclopedia Britanica, 1893

Gravity Train Remontoire

"E represents the scape-wheel turning in a minute, and e its pinion, which is driven by the wheel D…

"The click barrel-ratchet R is set upon another larger ratchet-wheel, with its teeth pointing the opposite way, and its click rT is set in the clock-frame. That ratchet is connected with the great wheel by a spring ss' pressing against the two pins s in the ratchet and s' in the wheel. When you wind up the weight, the click Tr prevents the ratchet from turning back or to the right; and as the spring ss' is kept by the weight in a state of tension equivalent to the weight itself it will drive the wheel to the left for a short distance, when its end s is held fast, with the same force as if that end was pulled forward by the weight; and as the great wheel has to move very little during the short time the clock is winding, the spring will keep the clock going long enough." — Encyclopedia Britanica, 1893

Harrison's Going-Ratchet

"The click barrel-ratchet R is set upon another larger ratchet-wheel, with its teeth pointing the opposite…

A pulley is a mechanism of a wheel on an axle or shaft that may have a groove between two flanges around its circumference. A rope usually runs over the wheel and inside the groove, if present.

Sash Pulley

A pulley is a mechanism of a wheel on an axle or shaft that may have a groove between two flanges around…

A bar or piece of mechanism turning at one end upon a pivot, while the other end falls into the teeth of a wheel or rack, allowing the latter to move in one direction only.

Ratchet

A bar or piece of mechanism turning at one end upon a pivot, while the other end falls into the teeth…

"A ratchet brace is a powerful instrument, and carries in itself the screw for obtaining the requisite pressure. Small holes can be drilled under a light pressure with rapid rotation on the part of the drill." — Encyclopedia Britannica, 1893

Ratchet Brace

"A ratchet brace is a powerful instrument, and carries in itself the screw for obtaining the requisite…

"In some of the cheap American alarm clocks there is used a simple ratchet—wheel which has the double advantage that it is noiseless, and is operative in every position." —Grimshaw, 1902

Noiseless Clock Ratchet

"In some of the cheap American alarm clocks there is used a simple ratchet—wheel which has the…

"A circular wheel, with teeth on the circumference, by which it can be moved or its motion stayed." — Williams, 1889

Ratchet-wheel

"A circular wheel, with teeth on the circumference, by which it can be moved or its motion stayed."…

A wheel with pointed and angular teeth, against which a ratchet abuts, used either for converting a reciprocating into a rotatory motion on the shaft to which it is fixed, or for admitting of circular motion in one direction only, as in a winch.

Ratchet Wheel

A wheel with pointed and angular teeth, against which a ratchet abuts, used either for converting a…

A wrench is a tool used to provide a mechanical advantage in applying torque to turn bolts, nuts, or other items designed to interface with a wrench.

Mechanical Wrench

A wrench is a tool used to provide a mechanical advantage in applying torque to turn bolts, nuts, or…