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Abridgments of Interesting Patent Specifications.

14th September 1905
Page 16
Page 16, 14th September 1905 — Abridgments of Interesting Patent Specifications.
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Which of the following most accurately describes the problem?

Hislop's Pneumatic Tyre; Melles' Rotary Valve.

No. 20,144, dated September igth, 1904.—Cushioned Pneumatic Tyre.—IIislop.—A rubber tyre (to) having a longitudinal groove on its inner side is secured

between side discs (II). The discs are connected to the hub, and may be strengthened by spokes or ccrrugations (15). The peripheries of the discs are kept apart by distance pieces (14), and secured together by bolts (131. Retained in place by the bolts and free to slide between the discs and in the groove in the tyre (Ice are a series of blocks (17), each provided with a slotted hole (22) to allow it to slide relatively to its bolt. Surrounding the hub is an air chamber (19), which normally keeps the blocks forced forward to the limit of their movement in a direction away from the centre of the wheel. As the wheel rolls upon the road these blocks are forced back against the air chamber (19) so that the requisite resiliency is obtained.

No. 8,914, dated April 27(11, 1905.— Lift and Rotary Valve.—Melles.—In the known combined lift and rotary valve gear in which the rctaxy valve acts as the controlling element, the lift valve protects the rotary valve during the period of pres.

sure in the cylinder, and the totary valve opens the exhaust port only when the lift valve is raised, so that a throttling of the gases previously exhausted takes place.

In the valve gear to which this invention relates the lift valve serves as the controlling element and the rotary valve as the cut-off element for the inlet and

exhaust ports. The rotary valve acts in such a manner that the exhaust port is fully opened when the lift valve is raised at the commencement of the exhaust. On the other hand, the suction pOrt is closed by the rotary valve only after the lift valve has previously cut off the communication between the cylinder and the port.

The bevel pinion (1) transmits move meat to the bevel wheal (3) rigidly mounted on the hollow rotary valve spindle (2), so that the rotary valve (4) is uniformly rotated. By means of the tappets (5) on the wheel (3), the socket

(6) which is displaceable on and surrounds the lower part of the valve rod

(7) is rotated and moves over the roller (9), rotatably mounted on the arm (8). The valve rod (7) passes through the spindle (2) as shown in Figure I . By the rotation of the socket (6) the valve (to) is raised, when a projection (it) on the cap slides on to or over the aforesaid roller

(9). The said projection (it) extends for a distance of more than iffo degrees around the circumference of the socket, and owing to this and to the fact that the gear is operated in the ratio of 1 :2 as beforementioned, the lift valve (to) is caused to remain open during a whole rotation of the crank-shaft, that is to say, during the exhaust of the burnt gases and the suction of a fresh charge. As soon as the projection (ix) on the socket leaves the roller (9), the lift valve (to) is closed by a spring (12).

During the expansion of the ignited gases in the cylinder the rotary valve (4) opens the exhaust port (i5), and shortly before the termination of this stroke the lift valve (to) is opened and the burnt gases can freely flow out through the said exhaust port. At the end of the following exhaust stroke, the port (15) is closed by the rotary valve (4), whereupon at the dead point for the next suction stroke the inlet port (16) is opened. The lift valve (to) therefore remains opened during the period in which the rotary valve close.s one port and opens the other.

At the end of the suction period the lift valve (to), which remained open during the exhaust and suction period, that is to say during two phases, is again closed.

The inlet port (to) remains open until the closing of the lift valve (to), and is only closed by the rotary valve (4) when Um, compression of the charge has already commenced in the cylinder. During the compression and explosion or expansion, the rotary valve again traverses from the port (t6 to 15), upon which the port (15) is opened and the action begins afresh.

It is thought that the Natal Government will shortly invite makers of all descriptions of motor vehicles to hold a competition at alaritzburg, with the idea of as. .aisting the motor movement in South Africa. There is a distinct want at present for services in various parts of the country, as there are many towns which lie a considerable distance from the nearest railway station.

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Organisations: Natal Government

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