Ryder and Davidson

of Kender Street, New Cross, London, S.E. 14 (1925) of 43a Pomeroy Street, London, S.E. 14 (1952)

1925 Shipping Engineering and Machinery Exhibition at Olympia: '.... I am of opinion that to engineers the stand of the Central Gear Co., Ltd., will provide the most thought-provoking display of the exhibition. make that statement as one keenly interested, and without prejudice. The heliocentric reduction gear is now being manufactured under licence by Messrs. Ryder and Davidson, of London, and is thus being made available on a sound commercial basis. Its motion is briefly as follows:— The high speed input shaft carries an eccentric which operates, by means of a ball-bearing retaining ring, a number of radial steel plungers passing through a plunger holder ring and engaging on internal rack of the outer casing. As the eccentric rotates, one half of the plungers are pressed out, meshing with the rack teeth, and as the number of teeth is different from the number of plungers, the retaining plunger holder, which floats concentrically with the input shaft, is given a rotary motion at reduced speed. The points which are of special note are that the contact between plungers and rack is purely sliding, and there is no danger of getting a metal to metal rubbing. The strength of the gears is enormous, and the output and input shafts are in line, without any subsidiary shafts.'. Alongside the article was an advertisement placed by Ryder & Davidson, with illustrations of the gearboxes, made under licence, noting that they had been made with reductions from 16 to 1 to 64,000 to 1.

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