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The ball screw was invented independently by H.M. Stevenson and D. Glenn who were issued in 1898 patents 601,451 and 610,044 respectively. Early precise screwshafts were produced by starting with a low-precision screwshaft, and then lapping the shaft with several spring-loaded nut laps [citation needed].
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.
Maudslay was the fifth of seven children of Henry Maudslay, a wheelwright in the Royal Engineers, and Margaret (nee Whitaker), the young widow of Joseph Laundy. [1] His father was wounded in action and so in 1756 became an 'artificer' at the Royal Arsenal, Woolwich (then in Kent), where he remained until 1776 [2] and died in 1780.
When you think of a vending machine, things like snacks, sodas or even pharmaceutical supplies could come to mind. But you might be surprised to know that the first ever vending machine actually ...
Fischer designed the ball grinding mill, a machine that allows steel balls to be ground to an absolutely round state in large volumes for the first time. His innovation was to tilt slightly the grinding wheel by 1.9°, forcing the balls to rotate on both their axis while they are ground. [ 1 ]
His was the first modern ball-bearing design, with the ball running along a groove in the axle assembly. [ 1 ] Jules Suriray , a Parisian bicycle mechanic , designed the first radial style ball bearing in 1869, [ 2 ] which was then fitted to the winning bicycle ridden by James Moore in the world's first bicycle road race, Paris-Rouen , in ...
Robertson screwdrivers are easy to use one-handed, because the tapered socket tends to retain the screw, even if it is shaken. [3]: 85–86 They also allow the use of angled screwdrivers and trim-head screws. The socket-headed Robertson screws are self-centering and reduce cam out. They also stop a power tool when set, and can be more easily ...
Screws are also used as linkages in machines to transfer power, in the worm gear, lead screw, ball screw, and roller screw. Due to their low efficiency, screw linkages are seldom used to carry high power, but are more often employed in low power, intermittent uses such as positioning actuators .