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flex-head ratchet Ratchets in which the drive head pivots or swivels back and forth on the handle at a pivot to the rear of the ratchet head. swivel-head ratchet roto-ratchet Ratchets in which the entire ratchet head swivels with handle attachments on the side of the ratcheting head rather than the rear of the ratcheting head. palm ratchet
A variety of ratcheting mechanisms are used, from simple pawls to more complex captured rollers, with the latter being more compact and smoother, but also more expensive to manufacture. The one pictured also features a drift pin on the tail. common flex-head socket wrench Saltus wrench: swivel head spanner: Similar in concept to a socket wrench.
A ratchet consists of a round gear or a linear rack with teeth, and a pivoting, spring-loaded finger called a pawl (or click, in clocks and watches [1] [2]) that engages the teeth. The teeth are uniform but are usually asymmetrical, with each tooth having a moderate slope on one edge and a much steeper slope on the other edge.
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Theodore Rueb, an engineer for the Sherman-Klove Company, went on to develop a new mechanism for a very successful line of ratchets, scaled from 1/4-inch drive up to 3/4-inch drive. The "round-head" ratchet has remained one of the most popular ratchet styles in the nearly nine decades since S-K's first development, and many modern ratchets are ...
Beyond its pillowy design—which features detachable back cushions for easy cleaning—the chair features a power-motion recline which is activated by the press of a button and a ratchet headrest ...