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Patents Completed.

26th February 1914
Page 26
Page 26, 26th February 1914 — Patents Completed.
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Which of the following most accurately describes the problem?

Starting by Magneto. Improving Disc Valves. A Novel Plug.

B. LAWRENCE, No. 29,620, dated 23rd December, 1912.— l'he object of this invention is to provide a magneto which will give a satisfactory spark for starting the engine under 111 conditions.

A rotary pole-shield is used and this is conneeted to the timing lever by a strong spring, so that the two are normally held in the same relative position. A detent is alto provided by which the two parts can be locked together when desired. The armature is connected in the ordinary way to the engine crankshaft, and is provided with weighted pawls, which can be made to engage the pole-shield but are held out of engagement by centrifugal action when the engine is running. When the engine happens to stop in certain positions it can be started on the spark; to do this the timing lever is moved from its normal position to full retard and back again. Tho armature is held stationary by the engine, and the pole-shield is held by the armature pawls against the action of a spring on the advance lever; the shield, on being suddenly tripped, returns to its normal position and produces the required spark. A stop is provided which prevents the action taking place when there is risk of the engine's back-firing.

G. P. Wn.i.Lims, No. 15,391, dated 3rd July, 1913.—The locking-nut described in this specification consists of twe parts, one of which is screwed within the other. Both parts are threaded internally to receive the bolt., but the thread by which they engage one another is made of a different pitch from that by which they engage the bolt. The two halves of the nut are slightly screwed together, and are then simultane.onsly screwed on to the. bolt. When the male portion ef the nut is tight, the other part is screwed a little further, and owing to the difference in pitch of the two threads the mit is locked securely in position on the bolt, but can be quickly released when necessary.

T. HORSLEY, U. 0. HORSLEY and H. B. Hattst.Ei, No. 29,896, dated 28th December, 1912.—The cylinder head has inlet and exhaust passages formed in it, and these communicate with ports opening into the cylinder. A disc-valve, with a segment cut out of it, is rotated across the inlet and exhaust ports and timed to give the desired cycle of operations.

The valve is subject to the full explosion pressure and, in order to prevent excessive wear on the valve face from taking place, the pressure is taken up on a ball thrust-bearing. The valve is mounted on a spindle which extends through the cylinder head and has a flange outside it. On to the head a cap is screwed, surrounding the spindle, and a ball thrustbearing is provided between the cap and the flange, so that the explosion pressure is transmitted to this bearing.

The valve face is lubricated by an oil duct leading from the outside of the head to the seat.

All the valves in a multi-cylinder engine of this class are driven from one shaft by means of skew gearing.

VT. M. MORDEY, No. 24,563, dated 26th October, 1912.— According to this specification the ignition spark for an internal-combustion engine is arranged to take place in a magnetic field, the magnetic repulsion causing the spark to spread out so that it acts over a larger area.

An electro-magnet is mounted in a brass or other nonmagnetic bushing, and a sparking plug is situated between the arms of the magnet, with the spark gap between the poles. The latter are brought as close together as possible, in order to give a strong magnetic field. The plug points are curved so that the spark starts at the smallest gap between them, but is compelled, by means of the magnetic attraction, to travel to where the gap is wider. Special provision may be made for water-cooling the magnet if it be necessary.

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