A NEW APPLICATION OF AN OLD DEVICE.
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A Resume of Recently Published Patent Specifications.
ARNOLD SEIDEL, of Berlin-Charlottenburg, in his specification No. 243,582, shows a new application of the kind of change-speed gear in which a number of projections were formed integral with a shaft and were made to engage internally projecting dogs in the bosses of the various gears to be employed. In the illustration, the left-hand upper shaft is
that which leads from the engine and is spigoted to the right-hand shaft which carries the bevel pinion of the final drive. Both the upper and lower shafts are provided with projecting dogs as shown, and the gears upon these shafts have suitable internal projections to permit engagement to be made with the shafts. At the junetion of the two upper shafts there are projections in the form of dogs formed on the face of the spigot to enable a connection to be made between-the two shafts when top gear is in operation. A pair of ;ears which are always in mesh communicate the drive to the layshaft. The outer box is one that is mounted in the usual manner, whilst the inner box is able to slide along the shafts, and is operated by means of a lever, the lower forked end of which can be seen at A.
By means of this lever the whole inner box with both sets of gearwheels can be moved along the shafts to a position where the gears will engage with the dogs on the shafts, which will give the desired ratio of gearing. The arrangement of dogs reminds: one of the box made by the Motor Manufacturing Co. some twenty years ago, and known as Idon's gear A Combined Lubricator, Cooling, Braking and Clutching System.
THE Maybach Motorenbau, of Friedrichshafen-on-Boden
see, in specification No. 234,854, describe a system of circulating oil by means of rotary pumps, so that it may perform the operations of lubricating the engine, cooling the oil, and assist in applying a brake and operating a clutch. Various arrangements of this system are shown, but that reproduced here is one that performs all the operations mentioned above. A number of passages are formed in the lower part of the engine sump, through which the oil is circulated, and where it is sail to be cooled by contact with the air. A strainer is provided, as shown, to arrest all foreign matter. The centre pump of the three is the one employed for lubricating the engine, whilst either of the other pumps may be employed for actuating the brake or clutch. The sectional view shown in the upper part of the drawing indicates the method of operating such
mechanisms a a brake or clutch. Normally, the oil can circulate freely through the chamber so long as the valve is open, but when this IS closed, or partly
closed, pressure is brought to bear on the piston, such pressure being regulated by the force employed to close the valve. The arrangement appears to be a costly and complicated one and does not seem to us to have any very novel points.
Improvements in the Silencing of Valve Tappets.
THE British Thomson-liouston Co., Ltd., in specification
No. 228,922, describe a method of producing a fibrous material which, they claim, can be employed in connection with tappets and valves, to prevent the noise produced by the impact of such parts.
Fibrous material, such as cotton, is made into the form of a cord, but without twisting, and is passed through a bath of some such binding substance as shellac, and is then cut off in the form of plugs, to be inserted in a hollow in the tappet, where it is acted upon by the end of the valve stem, as shown in the left-hand view. We have seen fibrous Material used for this purpose before, but it has been found that the impact of such a member as the end of a valve stem on such a small area quickly indented the fibre; we have, howev,er, seen fibre used with advantage when the area of impact was increased by the use of mushroom heads to both valve stem and tappet.
An Improvement in Carburetters.
THE Sunbeam Motor Co., Ltd., in their specification No. 243,560, describe a baffle which can be fitted to the jet of a carburetter, which, they claim, will increase the atomization of the fuel. According to the specification, it is stated that in large engines, where it is necessary that an unusually great quantity of petrol should be drawn from the jet, it has been found that such fuel is often not properly atomized, but leaves the jet in a solid mass, causing bad carburation,
The baffle shown is intended to be used in connection with those carburetters in which the air is drawn across the jet in a horizontal line. The figure on the right is an enlarged view of the baffle. The baffle is described as being a push fit on the nozzle of the jet, so that it can be readily adjusted to the position found most suitable.
. Spring Suspension.
A FORM of spring suspension is shown in the specification of W. Cochrans, No. 243,403. In this arrangement crosssprings ar3 employed which are composed of leaves arranged as shown in the lower view, where it will be seen that a number of leaves, as usually employed below the main leaf, are provided above and below. The specification points out that this arrangement resists both upward and downward movement of the spings. The centre of each spring is secured to the crossmember of the chassis so that the ends can move freely. Below the springs, where they are joined to the stub axles, is a link which ensures parallel movement of the stub axle. Angular links are provided
to relieve t h e springs of road shocks due to obstacles. The rear driving is effected by means of an axle which is provided with universal joints so that it can give to the spring play.