Hallowell does describe, however, the same inspiration also mentioned in connection with Allen for a wave of adoption of the hex socket head, beginning with set screws and followed by cap screws. This account from Hallowell does not mention the Allen patent of 1910 nor the Allen safety set screw product line. From this came the Unbrako line of products. presents a version of events in which SPS developed a hex socket drive in-house, independently of Allen, circa 1911. In his autobiography, the founder of the Standard Pressed Steel Company (SPS now SPS Technologies, Inc.), Howard T. Published advertisements for the "Allen safety set screw" by the Allen Manufacturing Company of Hartford, Connecticut, exist from 1910. Allen also patented a method of cold-forming screw heads around a hexagonal die ( U.S. Robertson of Milton, Ontario, first commercialized the square socket in 1908, having perfected and patented a suitable cold forming method, using the right material and the right die design. Patent 161,390), but he explains that these were patented but not manufactured because of the difficulties and expense of doing so at the time. Rybczynski (2000) describes a flurry of patents for alternative drive types in the 1860s to the 1890s in the U.S., which are confirmed to include internal-wrenching square and triangle types (that is, square and triangular sockets) ( U.S. The idea of a hex socket screw drive was probably conceived as early as the 1860s to the 1890s, but such screws were probably not manufactured until around 1910. While often used in generic terms for "hex key", the " Allen" name is a registered trademark (circa 1910) of the Allen Manufacturing Company (now Apex Tool Group) of Hartford, Connecticut regardless, "Allen key" and "Allen wrench" are often seen as generic trademarks. Variants on this design have the short end inserted in a transverse handle, which may contain multiple keys of varying sizes that can be folded into the handle when not in use. Key length typically increases with size but not necessarily proportionally so. As such, they are commonly sold in kits that include a variety of sizes. Hex keys are designated with a socket size and are manufactured with tight tolerances. The tool is usually held and twisted by its long arm, creating a relatively large torque at the tip of the short arm it can also be held by its short arm to access screws in difficult-to-reach locations and to turn screws faster at the expense of torque. The rods are bent to 90ยบ, forming two arms of unequal length resembling an "L". Hex keys are formed from a single piece of hard hexagonal steel rod, having blunt ends that fit snugly into similarly shaped screw sockets. A hex key (also, hex wrench, Allen key and Allen wrench or Inbus) is a simple driver for bolts or screws that have heads with internal hexagonal recesses ( sockets).
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