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 the Sale Branch, Patent Office, Holborn, W.C.
GEARBOX.—Dailey and Dailey.—No. 5,449, dated 4th March, 1910. (Cognate Application No. 17,714/1910).—This invention relates to the use of gear wheels with single helical teeth in power-fransmission gears, and especially in change;peed mechanism for motor vehicles. In order to eliminate the side thrust on the gearwheels' tending to displace them laterally on the shaft, a key or similar device on the shaft is arranged as a helix of the same, or of approximately the same inclination as the teeth on the wheel. This arrangement also allows the gears to engage more readily when changing speeds. Suitable thrust bearings are provided to take up the longitudinal thrust on the shafts, that is on the transmission and propeller shafts, while by a suitable arrangement the end thrusts on the layshaft may be made to balance one another. There is described and illustrated in this specification the threespeed and reverse gearbox.
FIRE PUMP.—Merry weather.— No. 30,192, dated 29th December, 1910.— There is described in this specification an improved method of constructing centrifugal or turbine pumps, whereby they are specially adapted for use as automobile fire-pumps. The suction inlet is made concentric with the pump spindle, and delivery passages are cast in each member of the pump, so that, when all the members are fitted together, waterways are provided conveying water from
the delivery end-piece to flanges on the suction end-piece. This arrangement. provides deliver), outlets at the rear or metier' end of the pump for the convenient attachment of delivery valves without the necessity of providing special pipes for the purpose. A delivery valve is illustrated which consists of a taper plug controlled by a lever either at the pump or elsewhere as convenient.
BRAKES.—Crossley and Reeves.— No 19,740, dated 24th August, 1910— The object of this invention is to obtain greater certainty and uniformity of action on the part. of each of several brakeshoes and to diminish the friction and prevent jamming between the movable pressure ring and the brake-blocks. The usual form of outside brake-drum attached to the wheel is provided, and the
brake-shoes are carried on a plate fixed to a statinnary part of the axle. The pressure-applying ring is made a floating fit around its retaining flange, and the usual form of pressure pin is provided to operate a bell-crank lever which rotates the pressure-applying ring. The rollers on this ring are forced into contact with the cam surfaces of the undersides of the shoes, thereby causing all the shoes to he positively and uniformly applied to the interior of the brake-drum. On the reverse movement of the pressure-applying ring, the rollers come into contact with the ends of adjacent shoes and positively release them.
CARBURETTER.—Albion Motor Co., Ltd.—No. 15,584, dated 29th June, 1910.
—This invention is a modification of that described in Patent No. 14,198, of 1908, and consists in the provision of a pilot valve which prevents momentary racing of the engine on light loads or when running at low speeds. In the form of valve that is illustrated, the gas passes downwards to the throttle, the additional air enters upwards and is controlled by a conical valve, and the mixture is delivered by the lateral passages to the various cylinders. The governing arrangements control the central valve which controls the gas and air inlets, but it is found that, to prevent racing, a hand-adjusted by-pass valve has hitherto been desirable; this is avoided by the use of the pilot valve which is also controlled by the governor and takes up the control when the main valve is closed.
MOTOR FIRE ENGINE.—Anderson.—No. 13,219. dated 31st May, 1910. —This invention relates to motor-driven fire engines of the type in which the engine used for the propulsion of the vehicle is also used to operate the water pumps. The engine is mounted in the customary manner in the front part of the vehicle, and drives the rear axle through an ordinary type of propeller shaft. A bevel gear is mounted on the engine shaft, and this drives another bevel on a shaft mounted transversely to the frame ; from this shaft a crankshaft is chain driven, and this is situated
transversely to the frame and beneath the driver's seat. The reciprocating water pumps are driven from this crankshaft.. A suitable clutch is arranged on the first shaft to throw the gear out of action. A chemical tank and a platform for carrying the hose' are arranged beside the water pump.