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A ratchet (occasionally spelled rachet) is a mechanical device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction. Ratchets are widely used in machinery and tools. The word ratchet is also used informally to refer to a ratcheting socket wrench.
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This ratchet was a very successful design, lasting from its introduction in 1961 to the eventual closure of New Britain in the 1980s. The ratchet was a compression engagement, using 12 teeth with a 60 tooth ratchet count. Later ratchets, from 1971 and onward, used a 9 tooth pawl making the ratchet a 45 tooth count.
Originally focusing on spiral ratchet and "plain" screwdrivers they soon expanded to various types of hand tools and eventually became a significant force in the tool industry. Eventually the success of the Yankee line of tools led the Stanley Works tool company to acquire the North Bros. in 1946, chiefly to improve their own product lines.
In 1882, James Harvey Williams and Matthew Diamond founded Williams & Diamond in Flushing, Queens, a drop forging business. [2] The business was relocated to Brooklyn in 1884 and took the name J.H. Williams & Co in 1887.
Schematic figure of a Brownian ratchet. In the philosophy of thermal and statistical physics, the Brownian ratchet or Feynman–Smoluchowski ratchet is an apparent perpetual motion machine of the second kind (converting thermal energy into mechanical work), first analysed in 1912 as a thought experiment by Polish physicist Marian Smoluchowski. [1]
Blackhawk Manufacturing was founded in 1919 in Milwaukee, Wisconsin as a subsidiary of the American Grinder Company (later named Applied Power Corporation). It made automotive tools, such as wrenches and sockets, [1] and a number of specialty tools.
The trade name "Yankee" screwdriver was first marketed by North Brothers Manufacturing Company in ≈16 April 1895, with the No. ≠130 spiral ratchet screwdriver. Yankee soon became and still is a well-known name in automatic spiral ratchet screwdrivers, with several other models, and model improvements patented by North Bros. over a 40-year ...