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Patents Completed.

18th February 1909
Page 24
Page 24, 18th February 1909 — Patents Completed.
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Complete specifications of the following patents will be sent to any address in the United Kingdom upon receipt of eightpence per copy at Sales Branch, Patent Office, Holborn, W.C.

SPARKING PLUG. — Haiti. — No. 19,201/08, dated, under Convention, lath September, 1907.—This invention relates to sparking plugs for internal-combustion engines, and has for its object to prevent fouling or sooting of the electrodes by excessive lubrication. The ignition chamber (B) in the plug is made unusually large and communicates with the cylinder by means of a number of openings (C). The electrodes (DI are arranged high up in the interior of the plug, and the lower electrode is secured to a cone carried on a stem or mushroom-shaped body (E) which is threaded into the lower part of the plug, thus permitting adjustment of the distance between the electrodes. Openings (G) arc placed diametrically opposite each other on a level with the electrodes, and serve as sight-holes by which the relative position of the points can be ascertained. On the explosion stroke the gas in the annular space (I) attains a great speed at the contracted part (H) and carries along with it such particles of oil, etc., that may have passed into the space (I) back to the cylinder through the lower openings (C).

BALL BEARINGS.—T-fillman.—No. 11,787, 30th May, I908.—This invention relates to ball bearings of the type having inner and outer ball-race rings, and

has for its object to render such bearings dust proof. The side faces of the race rings are recessed ; the recess in the outer ring is slightly undercut. These recesses accommodate two washers which are arranged to be sprung into position. For this purpose the washers are radially divided, and the outer edges are bevelled to correspond with the undercut recesses in the outer race ring. In a modified construction the washers are undivided and are formed with three projecting portions which extend slightly beyond their periphery. The outer race ring in this case is formed with grooves having corresponding portions cut away to allow the projecting portions of the washers to enter. In assembling, the washers are slid into position, and are then rotated until the projections on the washers engage the grooves in the outer race ring.

STARTING M ECHANISM.—Bell.— No. 11,670, dated 29th May, 1908.—According to this invention the engine and ignition device are coupled together by mechanism which is adapted either to actuate the ignition device independently of the engine so as to fire a charge, or to move the engine independently of the ignition device so as to .compress a charge ready for firing. Secured to the magneto shaft (A) is a sunwheel (B) gearing with planet wheels (E) which are mounted on a carrier (D) fast on the engine shaft (C). Mounted so as to be free to rotate on the carrier is a dished plate IF), the end (G) of

which has internal teeth gearing with the planet wheels, and external teeth adapted to gear with a similarly toothed wheel (11) which is arranged to slide into engagement therewith. The carrier (D) is formed with a slot ID2) terminating at one end in a hole (K1, and a corresponding hole is formed in the plate (F). Free to sale in these holes is a pin (L) which may either engage both holes, as shown in full lines in one of the figures, or which may lie in the groove ID.11, as shown in dotted lines. The pin is screwed into a plate (M) which is pressed against the dished plate. (F) by a spring (Ni. Nt hen it is desired to start the engine, assuming a compressed charge is in the cylinder ready for firing, the wheel (H) is slid into engagement with the external teeth of the plate (F). This forces the plate (M) away from the plate (F) against the action of the spring (N), thus withdrawing the pin (L) from the hole (K) and allowing relative motion to take place between the plate (F) and the carrier (D). This motion is limited by the groove (D2) and is so proportioned in relation to the gear ratios as to allow the magneto to be rotated backward to its fullest extent without altering the position of the distributor. The wheel. (H) is then rotated

in the opposite direction, thus bringing the parts back to their normal position during which time an igniting current is generated. The sun pinion being fixed to the magneto shaft it will be seen that when the internally-toothed ring (G) is actuated, the remaining parts being stationary, the tendency would be for the carrier (D) and sun pinion, and consequently for the engine shaft, to rotate in opposite directions if the resistance was equal. With the engine stationary, however, it is naturally easier to rotate the magneto than the engine. Consequently the sun pinion (B) and the magneto armature turn in the direction opposite to that in which they usually rotate. This brings the pin (L) into position at the other end of the groove. Further relative movement between the carrier (D1 and the internally-toothed ring is impossible, so that further rotation of the gear wheel (G) rotates the whole gear solid," the engine, and, incidentally, the magneto, turning round in its normal direction, but the latter is considerably retarded in relation to the engine. In this manner a charge can be drawn into the engine and can be compressed ready for firing.


Organisations: Patent Office

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