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PATENTS SUMMARIZED.

19th December 1918
Page 22
Page 22, 19th December 1918 — PATENTS SUMMARIZED.
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Which of the following most accurately describes the problem?

An Interesting Spring Develop ment.

Opinions are to some extent divided as to the advisability on all grounds of lubricating laminated or leaf springs. Thorough lubrication undoubtedly lessens the very beneficial damping action which is one of the impoi tent features of this typo of shock absorber. T. A. Tis deli seems decidedly to favour most efficient lubrication, judging by the invention which he describes in two recent specifications, namely, No. 120,093 and No. 120094. The object is the total en. closure of the spring, so that, after it has been thoroughly lubricated, egress of the lubrication is prevented, as also is the ingress of dirt or moisture. The casing for the spring diffess,from those to which, in one form or other, we are already aocustoined, in that it? is a rigid one and not a flexible one.

The illustration which we reproduce, and the following brief description,. concerns that form of road spring which is popularly known as the cantilever. The principle embodied in the patent, how: ever, appears to be, to all intents andpurposes, universally applicable to all those varieties of leaf spring which are commonly employed, on automobiles today. : The :,spring bracket takes the form, in cross-section, of an, inverted U, and bolted to the armsof the U, and between Jthem, is a barrel-like component, the axis of which ,lies; across the frain, that is to say, parallel to the vehicle axle. Inser i

ted n a suitable aperture, in this barrel is the butt, end of the spring, which is secured in place by means of substantial grub screws, as showy on the drawing. As the barrel is actually bolted to the spring bracket it will be gathered that it does not rotate, but merely serves to hold the end of the spring, and the latter is free to perform its usual function of flexing in order to absorb the various road shocks. The ends of the barrel are turned down su as to form trunnions, and on these bear a bush. The teunnions are, moreover, formed with two annular grooves, one near ' each end, and in these • annular grooves are assembled felt washers. The 050

airangement of grooves, washers and bush is such as to form an oil and watertight joint_ Bemired upon the bush is a sock'et into which a tapei ed 'solid metal casing is fastened. 'Ibis casing completely encloses the spring, and is formed on the inside, nearone end, with a facing upon which the free end of the spring bears either through the medium of a. pad or roller. To the outside of the casing and immediately under this facing it is convenient to attach the axle of the vehicle.

A grease plug' at the bearing. end of the casing is provided for the insertion of lubricant. It will be gathered that as the spring is free to operate as usual, it must carry the casing up and down with it. The bush which we have described as being interposed between the barrel and the socket end of the casing 'provides a suitable bearing upon which the casing can rotate.

Rolls-Royce Connecting Rods „ for V-type Engines.

Royce, of Rolls Royce, Ltd., in No. 120,174, describes a construction of connecting rod ends suitable for a Vtype engine. A substantial white metallined bearing bush is engaged directly with the journal of the crankpin. The metal portion of the outside of this bearing is turned to receive the connecting rod from 'one cylinder, and this rod is rather more than one-third the full width of the main brass. The remaining portion of the exterior of the step is grooved circumferentially, and upon ft is secured and pegged a fork-ended rod from the other cylinder

Daimler Brake and Change Speed Lever.

Although not, perhaps, directly concerning commercial motor users, the patent which is described in specification No. 120,130, by the Daimler Co., is nevertheless of interest. It concerns a brake' and change speed. lever, both combined within the one component, the arrangement being such that immediately the driver, whether consciously or

otherwise, releases the trigger of the hand lever, the engine is stopped and the brake applied. It appears as though the invention were in the first place intended to be applied to motor-driven rail

-vehicles. Release of the trigger causes completion of electrical circuits whereby the magneto is earthed, and a valve controlling a pneumatic brake is released.

Approved Bendix Engine Starter A modification of the gearing of the well known Bendix engine starter is specified by V. Bendix, in No. 120,138. The flywheel gear, instead of being, as has previously been customary, integral with the wheel, is now made RS a separate rim, fitting in a corresponding groove on the flywheel, and free to revolve in that groove, but for a number of pairs of opposed tension springs, which allow of a certain flexibility, thus facilitating the engagement of the starter component.

Acetylene Gas Generator.

Thu use of acetylene gas as a fuel for automobile engines is evidently considered probable by H. M. Klaer, a Dane, who describes in No. 119,853, a generator for the gas, which he says is antable for such a purpose. The device em-, bodies a container for the carbide, a bucket elevator, operated direct from the engine, which lifts the fuel and drops it into a tank of water, the gas when generated being led through a coil of pipe and a non-return valve to the engine. A diaphragm subject, to the pressure of the gas operates to disconnect, the driving gear of the bucket elevator in the event of that pressure passing a critical point.

Detail Improvements.

• A magneto is described by Sir Cl. S. Smith in No. 120,167, in which four horseshoe-shaped magnets are arranged co axially with the magneto. A hollow armature is devised so that the condenser is carried within it.

A aafety stating handle is the subject of No. 120.168 The drive between start ing handle and crankshaft is by friction only, and a ratchet wheel, integral with the starting handle is prevented from reverse rotation by a pawl.

G. Holt Thomas, in No. 120,057, describes an arrangement of connecting rod ends for a rotary multi-cylinder engine. , A main bearing engages with the crank pin journal, and round this, one upon another, are the bearings of each connecting rod.

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