how does allen key named allen key?

Answer 1

From Wikipedia:

Allen key
An Allen wrench, Allen key, hex key or hex head wrench is a tool used to drive screws and bolts with a hexagonal socket in the head.

Some of the advantages of this format of tool are:

-Six contact surfaces between bolt and driver
-Contact surfaces of the bolt are protected from external damage
-The bolt can be inserted into its socket using the key
-Torque applied constrained by the length and thickness of the key
-Very small bolt heads are accommodated
-Can be used with a headless screw

Using a single tool instead of many others reduces tooling costs for the manufacturer and is more convenient for the end user. Many manufacturers have adopted hex key bolts for assembling bicycles or for self-assembly furniture.

"Allen wrench" was originally a trademark of Allen Manufacturing Company in Hartford, Connecticut in 1943. In Europe, it is usually known as an "Unbrako key" (also often misspelled as "Umbrako"), which is a brand name established in 1911.

Answer 2

William Allen patented a process in 1910 for making hex socket set screws, which did not have the raised square head that other screws of the time had. Allen had to invent another tool, the Allen key, for turning the hex screws. These tools are available both as single units and in sets of different-size keys, called fold-ups, all attached in one tool. The Allen brand, owned today by Apex Tool Group, also manufactures the tool with a T-handle on the end. This style is used when the application of high torque is necessary.
https://www.electrikals.com/products/r/electrical-tools/a?cid=693&mid=43&mid=48&mid=34&cnid=219&page=1&pageSize=15

Answer 3

Well, the name Key was that of his father and grandfather so he had to keep that name and the name allan was probably given to him because Allan was a favorite name that the mother liked

Answer 4

it was invented by a guy named Allen Schmutz...

Answer 5

isn't he from Maryland