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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.
The screw pump is the oldest positive displacement pump. [1] The first records of a water screw, or screw pump, date back to Hellenistic Egypt before the 3rd century BC. [1] [3] The Egyptian screw, used to lift water from the Nile, was composed of tubes wound round a cylinder; as the entire unit rotates, water is lifted within the spiral tube to the higher elevation.
Typical Fischer-Plugs Fischer invented wall plugs to hold screws (not all of Fischer Brand) Artur Fischer (31 December 1919 – 27 January 2016) was a German inventor. He is best known for inventing an expanding plastic version of the wall plug. [2] Born in Tumlingen, Artur Fischer was the son of the village tailor Georg Fischer.
A leadscrew (or lead screw), also known as a power screw [1] or translation screw, [2] is a screw used as a linkage in a machine, to translate turning motion into linear motion. Because of the large area of sliding contact between their male and female members, screw threads have larger frictional energy losses compared to other linkages.
Leave Me Alurn — If women want to avoid small talk with men, they can use this "conversation prophylactic" in the shape of a funerary urn to make men think they want to be left alone while they spread their loved one's ashes. It's from the makers of Lower Back Spikes, a belt used for women who are sick of men touching them on the smalls of ...
The first Fistball World Championship was held for men in 1968, and for women in 1994. The top five teams from the Men's Fistball World Championships are also invited to compete in the fistball category of the World Games, also held every four years. If the host nation is a member of the IFA the sixth team is the fistball team of the host ...
In December of 1895, [11] William Morgan presented his new sport to the world. When Morgan was explaining the game before the demonstration, he named a few key guidelines in the game of “Mintonette” such as that the game was created so that it could be played in open air and in gyms as well as the objective of the game was to keep the ball ...