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2. Yankee screwdriver - Wikipedia

   en.wikipedia.org/wiki/Yankee_screwdriver

   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 ...

3. Screwdriver - Wikipedia

   en.wikipedia.org/wiki/Screwdriver

   The tool used to drive a slotted screw head is called a standard, common blade, flat-blade, slot-head, straight, flat, flat-tip, [6] or "flat-head" [7] screwdriver. This last usage can be confusing, because the term flat-head also describes a screw with a flat top, designed to install in a countersunk hole .

4. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   The tool used to drive a slot is called a common blade, flat-blade, slot-head, flat-tip [3] or flat-head / flathead [5] screwdriver. A hollow-ground screwdriver is less likely to cam out (leave the slot due to the torque being translated into an axial force, similar to that encountered with Phillips drive but dependent only on driver blade), so ...

5. North Brothers Manufacturing Company - Wikipedia

   en.wikipedia.org/wiki/North_Brothers...

   North Bros. tool brand was called Yankee, much as Sears tools are branded Craftsman, and every tool they sold sported this trademark. In later years the Yankee name would become synonymous with the spiral ratchet screw driver invented by Furbish but it was originally seen on everything from bench vises to cutting tools. Building upon the line ...

6. Screw - Wikipedia

   en.wikipedia.org/wiki/Screw

   The hand tool for driving hex head threaded fasteners is a spanner (UK usage) or wrench (US usage), while a nut setter is used with a power screw driver. Modern screws employ a wide variety of screw drive designs, each requiring a different kind of tool to drive in or extract them. The most common screw drives are the slotted and Phillips in ...

7. Spring (device) - Wikipedia

   en.wikipedia.org/wiki/Spring_(device)

   A flat spring fixed only at one end like a cantilever, while the free-hanging end takes the load. Coil spring Also known as a helical spring. A spring (made by winding a wire around a cylinder) is of two types: Tension or extension springs are designed to become longer under load. Their turns (loops) are normally touching in the unloaded ...