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Patents Completed.

28th March 1912, Page 20
28th March 1912
Page 20
Page 20, 28th March 1912 — Patents Completed.
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Complete specifications of the following patents will be sent to any address in the United Kingdom by the Sale Branch, Patent Office, Holborn, W.C., upon receipt of eightpence per copy.

Manufacture cf Pneumatic Tires.

A. Whiteway and Charles Macintosh and Co., Ltd.—No. 4,208, dated 20th February, 1911.—This invention relates to improvements in pneumatic tires and in the manufacture of outer-covers for them; it consists of dispensing with the old method of wrapping the tire-cover by fabric strips for the purpose of holding the tread in place, and of using a process for moulding, whereby the foundation-strip is secured to the body of the tire, after having previously been partly vulcanized. The main body of the tire is built up in the usual way, and a tread-strip carrying steel studs or other armouring is placed thereon after it has been partially cured. While the side and under portions of the main tread-strip are uncured, the interstices between the studs are filled in with plaster of Paris. with rubber or a like composition, which can be readily removed after vulcanization. The entire cover is then submitted to pressure and vulcanization in a mould constructed as shown in the accompanying drawings.

A Governor-controlled Valve Gear.

A. Salingre.—No. 16,030, dated llth July, 1911.—This invention relates to valve-gear mechanism of the type that is positively actuated, and yet permits a momentum governor to effect the cut-off automatically at any desired part of the

valve's motion. The mechanism is somewhat complex to describe, but it consists of a valve-actuating eccentric mounted upon the arm of a strap carried by another eccentric. This second eccentric is loose on the shaft, and is operatively connected with the governor, so that its angular position is controlled thereby. When it is displaced, the arm of the strap carrying the valve-operating eccentric is clisplated, and varies the throw of the latter whereby the desired control of the valve gear is obtained.

A New Starting Gear.

L. E. Cowey.—No. 4,712, dated 24th February, 1911.—In this specification there is described a starting-gear for an internal-combustion engine, in which a fluid-pressure motor, having a piston and a screw-spindle connected with the piston, is so arranged that at the beginning of the piston stroke the screw-spindle engages with the engine-shaft by a longitudinal movement, and on the continuation of the stroke turns the engine shaft and starts the engine. A cylinder of suitable length is provided with a piston having a tubular shank, which is screwed over a portion of its length to engage with a spindle which lies centrally in the cylinder. This spindle is provided with a simple clutch mechanism, which can engage with the end of the engineshaft, and it is also provided with a thrust bearing acting on the end wall of tho cylinder. Fluid under pressure is admitted behind the piston, and the first movement of the piston moves the spin dle longitudinally to bring the clutch into engagement. When longitudinal movement is no longer possible, the spindle is caused to revolve by the further movement of the piston, the screw thread by which they co-operate being of suitable pitch. The rotation of the spindle then starts the engine. Alternative constructions are described and illustrated in the specification.

To Balance the Engine.

Albion Motor Car Co., Ltd., and T. B. Murray.—No. 13,915, dated 12th June, 1911.—This invention relates to twostroke internal-combustion engines of the type in which there are two unit pairs of interconnected cylinders, the cylinders of each pair operating one crank, coincident. cranks, or cranks of small phase difference.. The object of the invention is to provide a simple construction of such an engine which will permit of accurate balance and even turning movement being obtained, the improved construction giving two equally-spaced impulses during each revolution. The pumps mind the cylinders are all in the same longi tudinal axial plane and are arranged alternately-. The cranks of the pumps and of the adjacent unit pair of cylinders are set at 180 degrees, the pump being formed as a piston of two diameters reciprocating in a suitable cylinder. Pure air is compressed in the upper portion and the explosive mixture in the lower annular portion, or it may be desirable to reverse this arrangement to ensure that any leakage of the mixture past the piston, whilst it is being compressed in the upper portion, would pass into the lower air-compressing portion of the cylinder arid thus would not be lost.

An Improved Austin Wheel.

The Austin Motor Co., Ltd., and H. Austill.--No. 9,580, dated 20th April, 1911.--This invention relates to the type of wheel rim in which a pneumatic tire is held in position by a detachable ring which is slipped around the sole-plate of the rim and is held from slipping back by a steel ring which has been split at one side and sprung into a groove formed on the sole-plate. There are several disadvantages in the use of this steel ring, and to obviate these a ring of rubber or like material is substituted for it. This ring is conveniently of round section, substantially half of it being let into the groove on the sole-plate. The elastic ring is readily stretched sufficiently to enable it to be inserted or re

moved from the groove. It also makes a water and dirt-tight joint between itself and the ring which grips the side of the tire. The elastic ring may be reinforced by a core of canvas, or it may have a wire embedded in it.

Tags

Organisations: Patent Office
People: Austin Wheel
Locations: Paris

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