From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Instructions for repairing tyre cuts, punctures, and bursts using 'U-nead-it' compound.
| Identifier | ExFiles\Box 77\4\ scan0121 | |
| Date | 14th April 1921 guessed | |
| Explaining Process of Repairing Cut in Tread of Cover. (1) Shows a deep cut or incision penetrating to the canvas. (2) Is the same cut with the damaged edge trimmed in the form of a bevel or counter-sunk hole. (3) Shows the counter-sunk hole with edges and surrounding surface thoroughly roughened. (4) It has now had a coat of “U-nead-it” cement thoroughly rubbed into edges and surrounding surface. (5) Shows the “U-nead-it” firmly pressed into the hole and extended a quarter-inch all round same. Repairs to portion of tread that comes in contact with road should be done at night when car is finished with; the “U-nead-it” will then be vulcanised and ready for use in the morning. Repairs to any portion of tyre that DOES NOT come in contact with ground can be done and used immediately. PLAINING PROCESS OF REPAIRING A PUNCTURE. (1) Puncture. (2) Shown with a larger uniting surface obtained by gouging or stripping a small piece of rubber out around the puncture with scissors. (3) Bevelled or counter-sunk part and surrounding edges well roughened. (4) Shows the coat of “U-nead-it” Cement applied into and around hole. (5) The puncture is seen filled with “U-nead-it,” slightly above the level of the surrounding tube. Repair is now complete and ready to be placed in cover and inflated. It will be seen that as the air pressure rises 50, 60, 70lbs. as the case may be, the repair is held as in a vice, until in a short time it vulcanises itself. When tube is next removed from cover it will be noticed that repair is homogeneously welded into and quite flush with the tube. The above illustration shows how a cross section of a “U-nead-it” repair looks when executed. “U-nead-it” does not cover the hole, it fills up solid like a weld in iron. BURSTS.—The method of repairing these is exactly the same whether the burst be 1in. or 12in. long. First take a gouging cut of each end of the burst, holding tube between thumb and finger of left hand (this prevents burst from extending on), then bevel edges all round, and burst will then appear as per sketch; now thoroughly roughen bevelled edges and around same for 3/8in. clean with roughener, rub “U-nead-it” Cement well into and around hole for 3/8in. Take sufficient “U-nead-it” to cover and fill repair and allow to dry before use. A burst should be repaired overnight. “U-nead-it” Repairs are like a weld in iron, and unlike patches, are unaffected by heat. Your Tyres will last longer. Your expenses will be less if you use “U-NEAD-IT.” A Stitch in time save nine. “U-NEAD-IT” will save you its cost ninety-nine times. | ||