ratchet is a mechanical device that allows linear or continuous movement in only one direction while preventing movement in the opposite direction. Ratchet is widely used in machinery and equipment. Despite something being mistaken, "ratchet" is also often used to refer to a ratcheting socket wrench, a common tool with ratcheting grip.
Video Ratchet (device)
Operating theory
A ratchet consists of a round tooth (see Figure 1) or a linear shelf with a tooth, and a spring finger, a spring called pawl (or click , in a clock and watch) involving teeth. Teeth are uniform but asymmetrical, with each tooth having a moderate tilt on one side and a steeper slope at the other.
When the tooth moves in an infinite direction (ie, forward) (see Figure 2), the pawl easily slips upward and through the edges of the inclined tooth, with the spring forcing it (often with audible clicks) into the depression between gear as it passes through the end of each tooth. When the tooth moves in the opposite direction (backwards), however, the pawl will catch the steep sharp teeth of the first tooth that it encounters, thus locking into the tooth and preventing further movement in that direction.
Backlash
Because the ratchet can only stop backward motion at discrete points (ie, at the border of the tooth), ratchet allows a limited number of reverse movements. This retreat - which is limited to the maximum distance equal to the distance between the teeth - is called the backlash. In cases where the backlash should be minimized, a smooth, toothless rompeta with a high friction surface such as rubber is sometimes used. The pelvis bears against the surface at an angle so that any backward motion will cause the pawl to jam against the surface and thus prevent further back motion. Since backward travel distance is primarily a function of high friction surface compressibility, this mechanism can significantly reduce backlash.
Maps Ratchet (device)
Usage
The Ratchet mechanism is used in a variety of applications, including these:
- Capstans
- Clock
- Freewheel (mastering coupling)
- Jacks
- Anti-rollback devices used in roller coasters
- Slacklines
- strap rope
- Doors
- Handcuffs
Alat tenun
Galeri
Lihat juga
- Brownian ratchet
- Freewheel
- Kopling sprag
Referensi
Source of the article : Wikipedia
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