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Patents Completed.

1st August 1912, Page 22
1st August 1912
Page 22
Page 22, 1st August 1912 — Patents Completed.
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Which of the following most accurately describes the problem?

Renold Chain Adjustment.

Hans Renold, Ltd., and D. H. Simpson, No. 17,316, dated 29th July, 1911. —This invention relates to the preven

tion of backlash in chain drives such as are used for driving the valve-shafts of engines where it is impossible to adjust the chain by moving the shafts apart. Each shaft carries two sprocket wheels connected up in pairs by two chains. On one of the shafts one sprocket wheel is mounted upon a boss on the other sprocket wheel, and it is attached thereto by bolts passing through elongated holes in the web of the sprocket wheel. Thus, these two sprocket wheels may be adjusted angularly relatively to each other, so that the driving-sides of the two chains can always be kept tight. The invention is particularly of use in cases in which the direction of rotation is reversed, or in which the drive is intermittent.

Leal Spring.

Albion Motor Car Co., Ltd., and T. B. Murray, No. 21,636, dated the 2nd October, 1911.—To obviate the disadvantages due to rust in leaf springs, and also in some measure to prevent the formation of rust, this invention provides between each leaf spring two thin strips. One of these strips is of a non-rusting metal such as brass, bronze or gam-metal, and the other strip is of a wear-resisting nonmetallic material such as vulcanized fibre. The fibre and brass strips move one on the tither during the operation of the leaf, in preference to either of them moving on the steel spring; thus, even if rust does make its appearance, it does not materially affect the action of the spring.

An Eccentric Valve-gear.

J. D. Roots, No. 12,138, dated 19th May, 1911.--This specification describes a valve-gear for four-stroke cycle engines. In the construction shown the crankshaft carries a toothed wheel which drives, by means of three pinions, the toothed sheave of an eccentric. The proportions are such that this sheave is driven at half the speed of the crankshaft. Arranged around this half-speed eccentric sheave is a second eccentric, driven at full or crank-speed by a pin on the crank which engages a slot in the eccentric. The outer eccentric is thus rotated twice as fast as the inner eccentric. The outer eccentric is connected by the valve-rod to the valve for the purpose of control. Several modifications are described in the specification.

A Novel Band Tire.

J. Windibank, No. 15,363, dated 1st July, 1911.—An elastic tire according to this invention comprises a continuous

ring of rubber, vulcanized on to a divided base-band. Various means are provided for tightening this base-band on the wheel-rim. In one of the figures slots are cut in the base-band and in the wheel-rim and also the felloes, and through these slots are passed eye-bolts. The base-band may then be tightened up by nuts on the eye-bolts. The rubber ring is vulcanized to a base-band having overhanging edges, and this is fitted on to a wheel-rim also having overhanging edges. Tapered slots are cut in these overhanging edges, and the tire tightened up into place by T-headed bolts screwed into the felloes.

A Resilient Emergency Tire.

A. Turnbull, No. 28,905, dated 22nd December, 1911.—Patent of addition to No. 3543 of 1910.—This invention com

prises improvements in the emergency tire described in Patent No. 3543 of 1910, and is directed particularly to simplifying the construction and rendering the locking arrangements more secure. A series of blocks of rubber are provided between the rim of the wheel and the auxiliary rim, these sitting in the channel or on the beads of the rim as may be desired. Each block is carried on a swivel pin held in a bracket on the inside of the auxiliary rim. A metal rod is arranged in the middle of the block to prevent, excessive movement or yielding and possible breaking of the rim on a rough road. The V-notches are formed on each side of the block at right-angles to one another, and the bracket carrying the swivel pin has also a V-projection which engages one of the notches, and holds the block either in the vertical position shown in the drawings, in use, or turned through 90 degrees and lying against the spare rim when the latter is not in use.

Another Spare Wheel.

Joseph Knight, No. 14,799, dated 26th June, 1911.—The spare wheel according to this invention is provided with an internal bush which fits over the nave of the road-wheel. This bush is provided with recesses which fit over bolt-heads on the road-wheel to take the driving stresses. The heads of the bolts in the spare wheel also project through slots in the road-wheel for a similar purpose. The spare wheel is attached to the roadwheel by bolts screwing into the heads of the road wheel bolts,

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