With Intent to Improve.
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A Weekly Summary of Recent Patents, of Interest to the Maker and User of Commercial Motor Vehicles.
Selected and Abridged by H. S. Hall, A,M.I.A.& A Roller Bearing.
H. Mules and A. Ilansome and Co,, 'Ltd., Stanley Works, Newark-on-Trent, presents in specification No. 105,850 a design of roller bearing.
Reference. to imr illustration, which ,depicts one of the two drawings pub lished with the specification, shows that the principal portion of this bearing consists of multiple rollers carried in a metal CE1S0The case is of anti-friction metal, and is actually cast round the rollers in the form shown; it is, in addition, reinforced by means of steel wires which are also cast in place. The claim is for a roller cage, or separator formed of antifriction 'metal, strengthened with wires or their equivalent, and having a series of rollers partially embodied therein.
Pneumatic Tire Covers.
A. A. Crazier, of 8, Woodquest Avenue, Herne Hill, London, describes in specification NO. 105„796 a method of constructing covers for pneumatic tires, incorp-orating minds of raw hide so as to render the tire less. liable to suffer punctures.
The cover is ordinarily constructed with a fiat tread, within the substance of this tread is a specially prepared band of raw hide. This is intended to protect thenire from punctures due to any sharp object 'passing through the rubber portion of the tread. A second hand of the same material almost surrounds the air space or inner tube; this is intended in a..simila-r manner to reinforce the side walls of the cover) thus affording further protection to the tube or. air space.
The greater part if the specification deals with the method of treatment of the raw hide, rendering it suitable far use in this connection. In the main it consists of a thorough cleansing and drying, effected by soaking in benzole, squeezing, and exposure to the air, then being coated with guttapercha, unvulcanized caoutchouc, and then canvas or other suitable fabric.
The claims cover the process or treatirfent of the hide; as well as the coristruction of the tires, as shown in the drawing which we•reproduce: An Automatic Tire Pump and Air Reservoir.
R Rutherford, of 6, Paulton Street, Chelsea, S.W., utilizes the spacedietween the ti5No halves of a disc wheel as a. reservoir for compressed air for tire inflation. The two halves of the wheel are bolted together, as shown in the drawing we reproduce, so as to be airtight. An inner portion surrounds the hub, and is so attached that it rotates with the wheel. This inner portion carries two opposed cylinders, one on each side of the. hub. One cylinder serves as a pump, the ether
as a game for the•••••purnp rod. The inside of this attached portion of the wheel is open to the atmosphere, and it must,. therefore, 'make an airtight joint with tffedriside of the disc wheels, so ns to prevent leakage from the air reservoir. The piston of the guide cylinder is in consequence open, the side nearest the hub, to atmospheric pressure ; on the other side it is subject to Whatever pressure may be in the reservoir which is formed by the two halves of the wheel.
In order to off-set this difference of pressure, a tension spring is, attached to the reservoir side of the piston, this tension spring being attached to some fixed point inside the u heel. The guide cylinder and pump cylinder are cormented by arod, which, in order to pass the axle, has a cylindrical portioti at its centre. To the axle is attached an eccentric which drives the pump through the medium of rollers which bear on the inner edge of the flange of this eccentric, and are carried by the cylindrical portion of the rod which connects the two plungers. These rollers are only in the .driving position so long as the tension in the Spring. which we have mentioned is sufficient to overcome the effect on tha guide plunger of the pressure within the reservoir. When the pressure is such as' topvercome the effect of the spring tension, the pump, therefore, ceases to be driven. , By these means, the pressure within the reservoir is automatically kept' to any pre-determined figure.
Suitable means are afforded for coupling the reservoir to the valve in the inner tube of the tire, There are six claims, the first being for a wheel made, as described, with two discs forming a reservoir, the second being for, the provision of means of maintaining this reservoir charged with air pre-determined pressure, the remainder being for the details in connection" with • this' device, as we have described them.