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PATENTS SUMMARIZED.

26th September 1918
Page 22
Page 22, 26th September 1918 — PATENTS SUMMARIZED.
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Which of the following most accurately describes the problem?

Ingenious System of Mechanical Agriculture.

An ingenious and interesting method of utilizing mechanical power for driving cultivating implements is illustrated and described in specification No. 117,886, the patentee being F. G. Parry. A light steel framework carries an endless travelling band or chain, to which may be attached ploughs or harrows, or other .implements. This framework is supported by a pair of bogies, one at each end. One of the bogies also serves as a

support for the driving engine, and on each of them also is fixed a winding drum and cable. The engine drives the endless band through the medium of gears, and at the same time causes the two winding drums to revolve in Unison.

The drawing shows two ploughshares fixed to the travelling band, and these are so disposed that one of them is . ploughing, whilst the other is on the upper Orden of the travelling band.

In working, the frame is first laid clown 'at one side of tile field. The cables from the drums are taken across to the other sides or 60 ter as their length will allow. The engine is then started and the gearing enmeshed. The ploughshare at the bottom side of the band tommences to cut in the direction of progress of the band. At the same time the cable is slowly wound in, thus causing the framework, together with its ploughs and bands, th traverse the field. Provided that the gearing is suitably arranged, the machine will travel sideways

a distance equal to the width of one furrow during the time in which that furrow is cut. The operation of ploughing is, therefore, continuous across the width of the field, when, of course, it requires re-setting.

Lancia Springing.

The Lancia Co. has Patented in No 115,831 an arrangement of springing which incorporates the two principles or systems of semi-elliptic and cantilever. In the drawing which accompanies the specification, the rear axle is shown sup

porting a pair of flat springs which are anchored at the front and shackled at the rear, thus serving, presumably, as radius rods as well as springs. A pair of cantilever springs is so arranged that at their rear ends they are supported from the axle by means of shackles. They carry the frame, to which they are pivoted at their centre, and are also shackled to the fraine at their front ends.

Two-stroke Engine Valve Gearing.

An ingenious system of valve gearing for a two-stroke engine is the subject of No. 117,831, by W. MeHarry. The advantage claimed is more efficient control of the engine, particularly at light load. The valves are operated by cams, and the control consists in modifying the -length of opening of the exhaust valve. It is effected by forming two wide cams on the shaft which can move longitudinally. At full load the exhaust valve may be open, say, for 80 degrees of the movement of the crankpin. At light

load this movement may be doubled. A feature of the arrangement is that the induction valve opens M each case 40 degrees before the exhaust valve shuts, but the two close simultaneously.

Rails Brake Gear.

No. 117,850 is by G. E. D. Palls, being an improved side brake gear for heavy wagons. The side brake lever operates through pawls upon a ratchet wheel which is keyed to the same shaft as a grooved pulley in which, lies a, wire rope, which is' coupled to the brake cams. Increased leverage is in this way available and a brake of considerable power can be constructed.

Silencing Engine Exhaust.

An interesting method of silencing engine exhaust is the subject. of patent No. 117,868, by W. Hooton. The idea is to split the waves of exhaust gas up so that-In:Elf-of -them traverse one pipe, and the other half another. The pipes vary in length !Somewhat, and are united again ni common reservoir at their outer ends. The lengths of pipe are so adjusted that the gas in one emerges in a pulse of condensation at the same time as a pulse of rarefaction reaches the end of the .Other. The effect is IAN produce interference so that the exhaust issues in a fine stream, and a sound of definite pitch made by the emission of blasts at regular intervals is prevented. Several methods_ of Carrying the innovation out are described and illustrated.

Detail Improvements. •

No. 117,859, by J. Pomeroy, is a method of cooling sparking plugs by fitting them with collars of coiled wire or sheet Metal.

B. Thorn-as, in No. 117,860, fits a carburetter with a supplementary pipe between float chamber and jet. This pipe may be of any length, and is preferably -coiled round the engine exhaust pipe, or disposed in a similar manner so that the fuel is heated on its way to the jet, G. 0. Tiberti's -rotary engine consists of two drums, side by side, whichrotate in ellipticalchambers. The familiar spring-controlled vanes slide in and out of these drums as they revolve in the stator. In one drum the gas is induced and compressed by this inovernent. It is then allowed to emerge, flowing through a passage into the second drum, where it is ignited by sparking plug, expands, driving the rotor in the process, and exhausts. Specification No 105,339.

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