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Improved Synchromesh Device

23rd September 1938
Page 96
Page 96, 23rd September 1938 — Improved Synchromesh Device
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A Resume of Recently Published Patent Specifications

ASPEED-SYNCHRONIZING coupler for facilitating the meshing of gears in a gearbox forms the subject of patent No. 490,038 (void), from S. A. Georges Claude, Manet et Cie, of Malakoff, Seine, France.

In the drawing, the device is shown housed in the member (3) which constitutes the sliding, splined dog, capable of being engaged with either of the gears (2). The dog is formed by drilling holes around its. pitch-circle and counter-boring both sides;. this is normal manufacturing practice, and advantage is taken of this fact to incorporate a synchronizing device at little extra cost. At three points around the pitch-circle, the holes are enlarged to house sliding plungers (1). These are held by ball catches, and, when the dog is moved, these plungers exert friction on coned surfaces on the gears; this synchronizes the speeds of the two engaging members and allows the dog to be moved right home, the ballcatches being eventually overpowered.

Remote Control of Vehicle Doors.

IUEANS by which the driver of a bus 1YI or coach can operate sliding doors on the vehicle is the subject of patent No. 490,170, coming from W. Black and Park Royal Coachworks, Ltd., Abbey Road, London, N.W.10. The scheme comprises an endless chain or cable, to which the sliding door is attached. The cable is taken to a winding drum, located, for preference, in the canopy over the driver's cab. A winding handle projects downwardly to within easy reach of the driver, and step-up gearing in the mechanism renders the operation a speedy one.

Two-stroke Petrol-injection Engine.

PROGRESS in the design of two1 stroke engines in shown by AutoUnion A.G., Chemnitz, Germany, in patent No. 489,380, which discloses a petrol engine of this type with fuel injection.

Previous designs, the patentee states, have employed deflector pistons ; these dissipate the valuable energy of the rotating air, and result in imperfect combustion. The improved scheme employs a flat-top piston, and the air is deflected by a current from a twin B62 port. The drawing, being in section, shows but one inlet port (2) and one exhaust port (3), but these are duplicated symmetrically on the other side ot the cylinder.

The arrows show the direction of the gas motion during scavenging; after the ports have closed the air flows in a closed loop into which the petrol is injected from a lowpressure nozzle (1). Ignition is effected by a sparking plug in the usual manner.

Improved Type of Refuse-collection Body.

FROM the Eagle Engineering Co., Ltd„ and J. Walter, both of Eagle Works, Warwick, comes patent No. 490,083, disclosing an improvement to its existing type of refuse-collection body.

In the original design, rubbish was tipped over the rear wall (1) and was moved forward by an overhead trolley which took the wall and the floor-plate (6) so far forward as possible, having regard to their pivots (5 and 2). This arrangement resulted in a certain amount of waste space at the rear, when the body was fully loaded. The improved scheme obviates this by providing a plate (3) and a second floor (4); when the wall (1) has passed for ward, the plate (3) can be raised to assume a vertical position and thereby enclose a space hitherto ususahle.

Control Valve For Gas-propelled Vehicles.

THE practice of running vehicles on compressed Kis calls for some means for maintaining a constant pressure of the out-flowing gas, in spite of the gradual decline of pressure in the storage cylinder. Such a device is described in patent No. 490,117, which comes from T. Zan, Bassein, Burmah.

Referring to the drawing, the device consists of a conical body (3), the upper portion of which is closed off by a flexible diaphragm (2). The latter is open to the atmosphere on the uppr surface, and is. tensioned by a spring (1) adjusted by an overhead screw. In operation, gas from the storage cylinder enters the bore (5) and inflates the chamber until the diaphragm flexes and lifts a valve (4) thereby closing the supply. The gap then in the chamber is led via another bore (not shown) to the "carburetter,' which consists of a normal, throttled choke tube, fitted with a lightly loaded spring-valve instead of the usual jet.

A Vaporizer for Heavy Oil.

HEAVY-OIL vaporizers usually operlate by heating the oil from the exhaust, but patent NO. 487,396 (void), shows a rather different scheme. The patentees are A. Coredo and L. Wikzek, Rainergrasse 31, Vienna. In this arrangement the incoming air, which is heated, arrives at the inlet (8) and is split into two streams, one of which passes down the tube (7) and bubbles up through the fuel into a space (4). From this point, the mixture, which has become enriched, passes through a filter (5), and a seders of baffles (6), finally reaching the top of the container. Here it mingles with the remainder of the air, which has traversed pipe 1, filter 2 and central pipe 3. This air supply is taken through the filter (2) in order to impose a resistance equivalent to that in the fuel circuit; this feature is claimed to ensure a uniform mixture.

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Locations: Vienna, Chemnitz, London, Seine

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