A VALVE GEAR WITH INTERESTING FEATURES.
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A Resume of Recently Published Specifications,
VALVE E MECHANISM, the operation of which is controlled autom4ally by the intake of explosive mixture, and the exhaust of the products of combustion, is described in specification No.
210,556, by D. Asbury, who claims that thereby smooth operation is possible, irrespective of the speed ef the engine.
Inlet and exhaust valves are provided, and also another which serves to separate them from the explosion chamber during both compression and firing strokes. Furthermore, one spring suffices to close all three of these valves. The impulse produced by the exhaust gas is used to open the exhaust valve, and to force the inlet valve against its seat and maintain it there during the exhaust period, as well as to delay the closing of the exhaust valve itself until the exhaust practically ceases. It is claimed that this action results in the engine being relieved oaf the greatest. possible amount of the burnt gases, reduces the loss of combustible mixture, and improves its efficiency generally. Moreover, the use of a stronger spring than usual is permis bible without any ill-effects.
The exhaust valve may be described as being, in some respects, a piston valve. It is hollow and reduced in diameter for the greater portion of its length. The reduced portion serves as a passage for the inlet gases and is closed by the poppet-type inlet valve, which takes a seat upon the exhaust valve. Another poppet valve, seating on a facing in the cylinder in the ordinary way, shuts off both the other valves from the interior of thecylinder. Obviously this valve effects the final closure of either or both the others, hence the need for but one spring. When the top valve is lifted for exhaust, the pressure. within the cylinder takes effect upon the whole of the upper surfaces of the inlet and exhaust valves, producing the effect described above. In the same way, having opened the top valve, the inlet can be opened automatically by the negative reduction pressure.
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Other Patents of Interest.
A NEAT form of rim for a pneumatic tyred wheel is described in specification No. 219,780, by J. 0, Kuenzinger. The rim is in two main parts, of which one, secured to the fells*, consists of a flange and a wide base, practically the full width a the rim. The other part is datachable, and consists of a flange and a narrow base, designed to slip under the other part of the rim. On the edge of the wide base there is a number of downwardly projecting tongues, which can be made to engage with corresponding recesses in the detachable part of the rim, and, when that part is pushed home and given a turn, the projecting tongues are locked in recesses at the back of the detachable rim. Suitable keys, driven through slots in the outer rim, and secured by screws to the felloe
of the wheel prevent the detachable part of the rim slipping back and releasing itself.
AN ingenious method of mounting a body on the chassis is described in specification No. 218,968, by B. F. F.
Meryille. The main connection is a longitudinal shaft, which is mounted in brackets on the chassis, and which carries the body by means of ether brackets bolted to its underside. Groups of springs are arranged along each side of the chassis, and these serve to damp oscillations ef the body about this central axle, In addition, to obviate difficulty -which would otherwise arise at the connection between the body and the bonnet, an elastic joint is made. at this point.
ACCORDING to H. van der Hof, some little difficulty has occurred in connection with the steering gear of sixwheeled vehicles of the tractor-trailer type in which both the front and rear wheels steer, on account of the move, ment of the strings af the rearmost axle. These springs are fixed at their front ends and shackled at. the rear, and in consequence, when the trailer is loaded, the axle MOWS to the rear, and this affects the steering gear when the only connection between the rearmost axle and the steering mechanism is a long rod or its equivalent. He suggests, therefore, in patent specification No. 219,613, that a horizontal sliding rod be interposed, having the same effect as a slotted connection, and providing that the effective length of the final coupling rod to the steering mechanism on the rearmost, axle remains unaltered by the movement of the springs on which that axle is mounted.
RATHER ingenious is the arrange ment of accelerator pedal described in specification No. 219,506, by J. G. Baker. The pedal is a flange on the top of a rod which descends, as is plunger, into a flexible tube in which there are a number of balls. The balls transmit the thrust of the pedal to the other end of the tube, and to another spring plunger which is coupled to the throttle-operating means.
LUBRICATION of leaf springs is the subject of specification No. 210,476, the patentees being C. Delmar and another. It telates to that type et device in which a solid bolt of circular section passes through an oval-shaped hole in the centre of the spring, while a cup on the top of the spring has two holes in its underside through which the lubricant runs down the sides of the belt into the spring and between its leaves. The drawback to this arrangement is, according to this inventor, that the spring is considerably weakened by the piercing of this oval hole, and he suggests that the central hole be made to fit the bolt, and that other small holes at the side be drilled for the reception of the lubricant.
THE principal object of the inventor who is responsible for the front-wheel Vrake gear which is described in specification No. 219,419 is to provide that, in the event of the brakes being in operation When the vehicle is steered round a corner, the tendency shall be for the braking effort on the inner wheel to become less, whilst that on the outer wheel is increased, The mechanism is simple enough, A floating cam, mounted in the space between the ends of the brake shoes and having a square hole in it, is engaged by the rounded square end of a spindle mounted in a bracket on the axle.
SOLEX carburetters are notable for
their extreme accessibility and the ease with which they can be taken apart and put together again. Patent specification No. 213,525 describes how that feature is macles applicable to the more complis rated models, and describes, in partici]. lar, the construction of a, double Solex carburetter.