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2. Worm drive - Wikipedia

   en.wikipedia.org/wiki/Worm_drive

   A worm drive is a gear arrangement in which a worm (which is a gear in the form of a screw) meshes with a worm wheel (which is similar in appearance to a spur gear). Its main purpose is to translate the motion of two perpendicular axes or to translate circular motion to linear motion (example: band type hose clamp ).The two elements are also ...

3. Sunbeam S7 and S8 - Wikipedia

   en.wikipedia.org/wiki/Sunbeam_S7_and_S8

   All three were very expensive with only modest performance resulting in low sales. The original model was the S7 (the "Tourer") (2,104 produced from 1946 to 1948), in 1949 the S7 was updated to become the S7 de luxe (5,554 produced) and the S8 (8,530 produced). Both had new cylinder linings, redesigned frames and increased oil capacity.

4. David Brown Ltd. - Wikipedia

   en.wikipedia.org/wiki/David_Brown_Ltd.

   In 1913, they established a joint venture in America with Timken for Radicon worm drive units. By the end of World War I the workforce had increased from 200 to 1,000 as they started building propulsion units for warships, and drive mechanisms for armaments. By 1921 the company was the largest worm gear manufacturer in the world. [2]

5. Rotary-screw compressor - Wikipedia

   en.wikipedia.org/wiki/Rotary-screw_compressor

   Principal view of the pumping action of a twin-screw pump with a six-lobe female screw and a five-lobe male screw. A compressor (as opposed to a pump) would be shaped the same way, except that the shape of the lobes would change along the length of the screw, so that the volume of the trapped pockets would get squeezed smaller as they get closer to the exhaust port.

6. Rotation around a fixed axis - Wikipedia

   en.wikipedia.org/wiki/Rotation_around_a_fixed_axis

   An example of rotation. Each part of the worm drive—both the worm and the worm gear—is rotating on its own axis. A rigid body is an object of a finite extent in which all the distances between the component particles are constant. No truly rigid body exists; external forces can deform any solid.

7. Hub gear - Wikipedia

   en.wikipedia.org/wiki/Hub_gear

   Before epicyclic gears were used in bicycle hubs, they were used on tricycles. Patents for epicyclic hubs date from the mid-1880s. [5] [6] The first patent for a compact epicyclic hub gear was granted in 1895 to the American machinist Seward Thomas Johnson of Noblesville, Indiana, U.S.A. [7] This was a 2-speed but was not commercially successful.