Minimizing Detachable-rim Troubles
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A Device Designed to Simplify Tyre Changing and to Minimize Risk of Rim Fracture or Oilier Mechanical Failure
I N our issue dated February 9, we dealt briefly with a new patented detachable-rim construction. The inventor, Mr. L. Caro, Kindia, Church Road, Oxley, Wolverhampton, now asks U3 to draw attention to certain advantages afforded by his design which limitations of space forbade inclusion in our original reference.
The cone joint, between the two portions of the rim itself, affords an unbroken surface around the whole base of the rim. The junction of each flange with the base is reinforced and shaped to give a spring effect. Thus fractures at this point—not unknown when oversize tyres are fitted—are avoided; the reinforcement provides greater strength, whilst the sprung flange combats sheering stresses. All parts are easy to manufacture and many are interchangeable with those for rims of different dimensions.
We drew attention to the claim that, in tyre removal, parts adhering through rust or other cause are parted by the pressure of the partially inflated tyre and do not cause trouble to the manipulator, and we commented to the effect that, in the event of a punctured tube, this advantage would be absent. Mr. Caro argues, in defence of this criticism, that, since the introduction of restrictions in connection with the employment of tyres that have worn smooth,
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tyres rarely suffer such damage that they are not inflatable. The accompanying drawings shoW tour applications of the design. The two left-hand views are of rims for single or twin tyres in position on the hub or felloe of the wheel:;:the others the corresponding arrangements-for disc wheels. . . In all cases the split rings retain the parts in assembly only until the clamping nuts are tightened. To simplify removal and replacement of these split rings bayonet-type attachments may be employed.