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P. L. Robertson. Illustration from the 1909 Canadian patent for the Robertson screw. Peter Lymburner Robertson (December 10, 1879 – September 28, 1951) was a Canadian inventor, industrialist, salesman, and philanthropist who popularized the square-socket drive for screws, often called the Robertson drive. Although a square-socket drive had ...
Robertson screw. A Robertson screw, also known as a square screw[1] or Scrulox, [2] is a type of screw with a square -shaped socket in the screw head and a corresponding square protrusion on the tool. Both the tool and socket have a slight taper. The contemporary square drive screw has all but replaced the Robertson screw proper and is commonly ...
Yankee screwdriver. Stanley 130B, 135B and Handyman 233H. 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 ...
List of screw drives. At a minimum, a screw drive is a set of shaped cavities and protrusions on the screw head that allows torque to be applied to it. [1][2] Usually, it also involves a mating tool, such as a screwdriver, that is used to turn it. Some of the less-common drives are classified as being "tamper-resistant".
Screwdriver with rubber handle. 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.
In 1976, Western Forge shipped its 100 millionth Craftsman screwdriver. [5] In 2008, the company produced its billionth screwdriver overall. [3] In 1978, Western Forge applied for and received its USA trademark. [6] They produced and test marketed a line of hand tools branded with their own name. In 1981, the company was acquired by Emerson ...
Torque screwdriver. A torque screwdriver is a screwdriver with components that ensure tightening to a specified torque, ensuring tightening which is sufficient, but not excessive. An insufficiently tightened screw connection may loosen in operation, and excessive tightening can damage parts; for example, if the nuts holding the wheel of a car ...
Pratt-Read was founded in Ivoryton, Connecticut, in 1798 as Pratt, Read & Company, originally producing beads, buttons, and billiard balls from elephant tusks imported from Africa. [3] The company began to specialize in manufacturing ivory piano keys in 1839 [4] and eventually piano action mechanisms. The company made its first screwdrivers in ...
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