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Patents Completed.

3rd June 1909, Page 20
3rd June 1909
Page 20
Page 20, 3rd June 1909 — Patents Completed.
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Complete specifications of the following patents will be sant to any address in the United Kingdom upon receipt of eightpence per copy at the Sales Branch, Patent Office, Holborn, W.C.

DIFFERENTIAL GEAR—Hoar-c.No. 1,899, dated 26th January, 1909.— This invention relates to means for rendering the differential gear of trac

tion engines or other motor vehicles inoperative, whereby the driving wheels are locked together. This may be effected by the engine driver from the foot-plate whilst the engine is running. A frame or ring carrying locking pins is mounted on a spur wheel that revolves upon a fixed bearing independent of the differential gear ; the differential gear is driven by this spur wheel. When it is desired to lock the road wheels together, the frame or ring carrying the pins is advanced so that the latter enter holes provided in the spur wheel and the differential gear. These holes are elongated or of sufficiently large diameter to allow free movement of the springs when

the wheels are locked together. Holes are also provided in the hub of the road wheels and in the differential plate; and into these holes long pins may be inserted from the outside. HYDRAULIC ('LUTCH. — Boothby and Others—No. 9,145, dated 27th April, 1908.—This clutch comprises a cylindrical casing secured to a flange on the driving shaft. This casing is filled with oil. An eccentrically-mounted cylinder is secured to the driven shaft and is arranged to abut against one side of the outer casing. The driven shaft is capable of a certain amount of axial movement, and this movement is utilised to operate a gate valve in the eccentri caliy-mounted cylinder through a. suitable system of levers. Mounted so as to rotate with the outer casing of the clutch and consequently the driven shaft,

are vanes or pistons wh.ch are capable of radial movement. These vanes are arranged to rotate withii the eccentrically-mounted cylinder. It will be seen that when the gate valve is closed a certain amount of relative motion between the driving and driven shaft will be possible until the fluid within the eccentrically-mounted cylinder is compressed when both members of the clutch will rotate together and direct drive will be obtained. When the gate valve is

partially opened, a certain amount of slip will take place which will allow relative movement between the driving and driven shafts. When it is desired to put the clutch out of operation the driven shaft is moved axially to its full extent, and this movement causes the eccentrically-mounted cylinder to leave that side or the casing against which it. normally abuts, so that the piston and the chamber merely revolve in the fluid.

IGNITION SYSTEM. — Bosch.—No. 4,137, 1908, dated under Convention, 28th October, 1907.—This invention relates to a method of starting multicylinder engines and consists in effecting

the ignition, in the first instance, with the aid of a trembler in the well-known manner and then effecting the ignition by single sparks when the engine has been started, the trembler then being cut out of action. The high-tension circuit of a single sparking coil is connected in succession by the distributor with the various sparking-plugs, while the lowtension circuit is normally in series with an interrupter driven from the engine shaft. This interrupter is rendered inoperative on starting the engine by temporarily establishing a circuit. in parallel with t6 interrupter through the trembler of the sparking apparatus.

VARIABLE SPEED GEAR. — De Veulle.—No. 15,326, dated 20th July, 1908.—This invention relates to variable-speed gears of the type described in the specification of British Letters Patent No. 6,344 of 1908. This gear comprises a plate carrying a number of oscillating discs which are operated from the driving shaft by means of a cam. These discs transmit a variable oscillatory movement to the driven shaft, in one direction only, by means of one-way clutches. The present invention refers particularly to the transmission of the oscillatory movement from the disc to the gear spindles. This is accomplished by providing a pin on each disc that engages a link which is mounted on a crankpin forming part of a crank that is secured on the gear spindle.

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