THREE SALERNI PATENT S
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A Résumé of Recently Published Patent Specifications
THREE of the patents published this week bear the name of P. If. &demi, 23, Carlton House Terrace, London, W. The numbers of these patents are 347,092, 347,093 and 347,155, and all of them relate to a form of epicyclic gearing in which compound planet wheels are employed, the change from one 'gear to another being made by means of clutches of the well-known Saler»i type, in which
it is not possible for the (logs to engage until the two parts are rotating at approximately the, same speed. . The specifications are all very long, one containing no fewer than 28 figures and 42 claims. The drawing selected. however, should make clear the principle on which the gear works, especially if read in connection with the description given in our issue dated May 5th.
A Friction Clutch Behind the Gearbox.
PATENT No. 347,140, by W. V. James, Myrtle Grove, PontEiw, Swansea, and T. B. Rosser, describes a second clutch Situated behind the gearbox, so that when the ordinary clutch is released the gearbox is separated from the shaft leading to the rear axle. , The two clutches and brakes acting on the Bluets of the gearbox are all coupled so that they act together. 'Unfortunately the specification does not describe any particular form of clutch suitable for the heavy torque to be transmitted from the lower gears to the rear axle. To find a form of clutch suitable for this purpose has been the difficulty whichhas been encountered by previous experimenters who have worked on these lines.
• A Cheaply Produced Gearbox.
THE gearbox described in patent No. 347,473, by G. Roesch • and Clement Talbot, Ltd., is claimed to be one that can be produced at a low cost, and to be simpler nod lighter than the usual construction.
The pinion (12), is integral with the driving shaft and •
forms a bearing for the end of the driven shaft (11). Both the pinions 12 and 16 are provided with .internal dogs, which can be engaged either by ring 29 or ring 28 for third or top gears. A shaft (21) is provided with four grooves in 'which lie four long sliding keys (31). The pair of wheels which engages with those on the layshaft for first and second gears fits upon the round part of the driyen abaft,-and the keys act as splines. As the gears which operate the third speed do not slide, it would be possible to use teeth vf helical form, and thus produce what is known as a silent third speed.
To Make Gear-changing Easier, RELATING to various devices which are claimed to make gear-changing easier and more certain, patent No. 345,501 is by F.' H. Royce. • The particular part of the invention which we selected as being of interest to our readers refers to a method of automatically locking the gear-change lever in. a neutral position whenever it passes over that point; and from Which it can only be moved by causing a partial vecuum.in the induction pipe by closing the throttle.
• The boss of the lever, or a collar on its shaft, is provided with a notch into which the end of thebellcrank lever is forced by the spring within the cylinder shown. A pipe leading from this –cylinder to the inlet 3nanifold is indicated by an arrow, -whilst a vent on the °pp) site side of the piston communicates with the atmosphere.
The action of the device is as follows :—While changing from one gear to another the lever is arrested when it reaches " the neutral point, and cannot be moved so as to engage any of the gears Until more than the normal depression is set up in the manifold by dosing the throttle,thus drawing the piston to the left and so releasing the catch which holda the lever. have A New Form of Governor.
IN-patent No. 347,185, which relates to a governor, appears the name of Fiat Societa Anonima. The specification pointS out that in lorries used for agricultural purposes, tractors, etc., and in countries where some form of governor is demanded by traffic rules, it is necessary that engines should be governed so that their speed should not at any
time exceed a predetermined rate. • The end view shows two -weights held together by a spring
and rotating with a shaft which may be driven by the same belt that drives a fan. These weights rotate within a drum which, so long as the 'predetermined speed is not exceeded, is clear of the weights, but should the speed be sufficient to overcome the spring the weights will come in contact with the drum and cause it to move with them sufficiently_ for the lever shown to act upon, the throttle and thus reduce the speed. The governor is independent of the accelerator.