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2. Fein (company) - Wikipedia

   en.wikipedia.org/wiki/Fein_(company)

   In 1895, Fein invented the electric hand drill, which is considered the forerunner of power tools. [1] [2] The first "drill with electro-pneumatic hammer mechanism" was built in 1914 by the company and applied for a patent. Fein developed the first tin snips and the first jigsaw in 1927. [3]

3. Socket wrench - Wikipedia

   en.wikipedia.org/wiki/Socket_wrench

   For example, a 1 ⁄ 4-inch to 3 ⁄ 8-inch adapter allows sockets with 1 ⁄ 4-inch drive holes to attach to a 3 ⁄ 8-inch ratchet, and so on. Universal joints are two articulated socket joints (about 1 inch (25 mm) long) combined at a right angle, that allow a bend in the turning axis of the wrench and socket. They are used with extensions ...

4. Chuck (engineering) - Wikipedia

   en.wikipedia.org/wiki/Chuck_(engineering)

   A pin chuck is a specialized chuck designed to hold small drills (less than 1 mm (0.039 in) in diameter) that could not be held securely in a normal drill chuck. The drill is inserted into the pin chuck and tightened; the pin chuck has a shaft which is then inserted into the larger drill chuck to hold the drill securely. Pin chucks are also ...

5. Drill - Wikipedia

   en.wikipedia.org/wiki/Drill

   A standard hammer drill accepts 6 mm (1/4 inch) and 13 mm (1/2 inch) drill bits. The operator experiences considerable vibration, and the cams are generally made from hardened steel to avoid them wearing out quickly. In practice, drills are restricted to standard masonry bits up to 13 mm (1/2 inch) in diameter.

6. Wilhelm Emil Fein - Wikipedia

   en.wikipedia.org/wiki/Wilhelm_Emil_Fein

   Wilhelm Emil Fein (16 January 1842 – 6 October 1898) was a German inventor. He invented the worldwide first portable electric drill. Life early Fein portable ...

7. Machine taper - Wikipedia

   en.wikipedia.org/wiki/Machine_taper

   Even on many drill presses, handheld drills, and lathes, which have chucks (such as a drill chuck or collet chuck), the chuck is attached by a taper. On drills, drill presses, and milling machines , the male member is the tool shank or toolholder shank, and the female socket is integral with the spindle.