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Patents Completed.

25th February 1909
Page 30
Page 30, 25th February 1909 — Patents Completed.
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LUB RICATO R.—Searle and Another. —No. 7,123, dated 31st March, 1908.— This invention relates to sight-feed lubricators of the type in which the oil passes through a sight tube containing water, and it has for its object to render the

tube easily removable so as to facilitate cleaning. The glass vessel containing water is held in position by a stirrup which is pivoted at one end to the body of the lubricator, and which has at the other end an adjustable clamping screw. This screw is provided with an Indiarubber . pad which bears against the glass vessel. It will be seen that, in order to remove the glass vessel for cleaning purposes, it is only necessary to slacken the clamping screw and to swing the stirrup to one side. In a modified construction the glass vessel is held in a. cage by a screw-threaded cap. An india-rubber pad is interposed between this cap and the glass. This improved lubricator may be suitably employed where several are to be grouped together.

CARBURETTER.—Morgan and Another.—No. 6,139, dated 19th March, 1908.—According to this invention a wick carburetter is employed in conjunction with a spray carburetter in order to obtain a correct mixture of fuel and air at all speeds of the engine. A spray carburetter of the usual type is so adjusted in relation to the engine as to deliver at any speed of the engine above a certain limit a quantity of fuel, which is less by a constant amount than that required to give the desired mixture of fuel and air. The spray nozzle extends into a carburetting chamber (G) in which is arranged the wick. The wick comprises suitable material looped on to a wire frame and terminating on one side in a constricted portion which fits into a well (F). Fuel is supplied to the well (F) through an opening (11) and this supply is limited by means of a constriction (K) in an extension of the wick well (I). In order to limit the fuel supply to the wick, when the rate of evaporation from the wick is high, a pipe (I..) open to atmosphere is provided leading to the well extension (I) forming a gap between the constriction in the fuel supply pipe and the well (F). By this arrangement the wick evaporates the fuel, thus tending to lower the fuel level, in the wick chamber ; hence fresh fuel flows in at a head equal to the difference of this level set up by evaporation and the constant level. The induced air is led into the induction pipe (Q) by means of an elbow (R). For low speeds of the engine the fuel supply takes place mainly through the wick, while for the higher speeds the jet carburetter supplies a quantity of fuel less than the amount required to give correct mixture to the engine, the wick giving a constant fuel supply sufficient to make up the mixture to the correct proportions. In this manner a practically constant mixture of air and fuel is obtained for all speeds of the engine.

VARIABLE SPEED GEAR.—De Veulle.—No. 6,344, dated 21st March, 1908.—The driving shaft (A) carries a disc having a cam groove (B) which engages pins (F) eccentrically placed on disc (E) mounted in ball bearings in a plate (C). The number of these discs corresponds with the number of gears employed, but only one is shown in the illustration. The other face of the disc (E) is formed with a groove or channel which engages a box, the side (J) of which is formed with rack teeth gearing with a pinion (M) rigidly mounted on a spindle (N); this box is adapted to slide in a groove (K) formed in a plate (L). On the shaft (N) is a gear wheel (P) which gears with a pinion (P.)

mounted on the driven shaft Si.( Within the hub of the gear wheel (P) is a oneway clutch. The operation of the gear is as follows :--For driving, the plate (C) is in such position that the box lies towards one end of the groove (K) in the plate (T.). It thus follows that, as the disc (E) is reciprocated the box must rise and fall in the groove. This causes the rack (J) to rotate the pinion (M) on the spindle (N), and this motion

is transmitted in one direction only to the gears (P) which in turn drive the pinion (R) and the driven shaft (S). By varying the angular position of the plate (C) carrying the oscillating discs the amount of reciprocation imparted to the rack (j) can be varied as the centre of the disc (E) is moved towards a central position relatively to the groove (K). In this way a variable speed is obtained. When the plate (C) is adjusted so that the axes of the boxes coincide with the centres of the grooves the oscillation of

the discs imparts no motion to the gear members, whilst moving the plate (C) further, reverses the direction of the drive, if clutches capable of driving in either direction are used. The clutch in the hub of the gear wheel (P) may be positively engaged or disengaged by a cam on the driving shaft and a suitable system of levers.

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