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Patents Completed.

11th May 1916, Page 20
11th May 1916
Page 20
Page 20, 11th May 1916 — Patents Completed.
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Which of the following most accurately describes the problem?

Easily Detachable Dunlop Pneumatic Tires. Gramm Gewrbox. Disc Wheel and Magneto Improvements.

Copies of complete specifications of the patents published on this page can be obtained from the Sales Branch, Patent Office, Holborn, WC., at the cost of sixpence for each specification.

The security .bolts can be tightened before the disc is replaced.

W. • MADDOCKS AND T. F. READING, No. 9755, dated 5th

July, 1915.—Disc-wheels are made with one side removable to permit the tire to be mounted in place, but hitherto it has not been possible to secure it until th.e side of the wheel has been replaced. This necessitated the provision of openings in the disc to• give access to the security-belts.

According to this invention the rim of the wheel, which is carried by one disc, has a small tire-retaining flange on it, but the flange is not of sufficient height to form a permanent retaining-member for the tire: When deflated, the tire can be easily mounted in place over this rim, and, when inflated, the-rim provides sufficient grip to-enable the security-bolts to be screwed up. The detachable disc which carries the main retaining-flange. is then secured in place. This construction renders it unnecessary to have access to the security-bolts after, the tire has been mounted in position.

B. A. GRAM, No. 4783, 'dated 27th March, 1915.—The accompanying plan and elevation show a gearbox which is fitted close to the differential gear. The driving shaft on the right has two clutches on it. The first of these, which has a wide groove for the striking-rod, is held by .a spring in engagement with a pinion loose on the shaft and geared to the countershaft. The second clutch, on the end of the driving shaft, can be engaged with the driven shalt by a dog-clutch.

These two clutches are controlled by strikers on the same rod. When this rod is moved to the left the dog-clutch on the driven shaft engages a pinion driven from the countershaft to take a low-speed drive. As it is moved towards the right it occupies a neutral position, and the striker for the first clutch simultaneously travels across its groove, without, however, disengaging its clutch. Further movement towards the right engages die dog-clutch with the clutch on the end of the driven shaft and disengages the spring-pressed clutch, so that a direct drive is obtained. THE DUNLOP RUDDER CO., LTD., AND C. MACBETH, No. 4693, dated 25th March, 1915.—This invention relates to inner tubes for pneumatic tires of the so-called butt-ended type which have a passage through male and female connecting-portions for the free circulation of air within the tube. The drawings show the two connecting-portions secured on the ends of the tube. The female connector is formed with a 'educed portion

situated a short distance within the tube and the male connector is formed with a correspondingly reduced portion to fit inSide. A ridge or collar may be formed on the male member to act as a locking ring retaining it in its engaged position. A special feature of the invention lies in the fact that the ends of the connectors are made quite thin, the material gradually decreasing in thickness from the locking ridge to the end. Preferably the end of the male member is slightly larger in _diameter than the corresponding part of the female connector so that a tight joint is ensured between them ,• the tightness of this joint is increased as the air pressure in the tube increases.

C. U. MET.SOME-SIVITA, No. 247, dated 1st July, 1915.-According to this invention an induction coil is used in conjunction with a magneto generating continuous current. The coil is arranged in the arch of the permanent magnet and the condenser is situated between it and the armature. The generator is connected through an automatic cut-out to a bat

tery and to the lighting and ignition circuits. for the car . Should the generator voltage fall too low the cut-out automatically throws in the battery so that-it feeds these two circuits. As soon as the magneto voltage rises sufficiently the magneto is automatically brought into, action again to supply the light ing and ignition and also to charge the battery. ,

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Organisations: Patent Office
Locations: READING

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