The tire repairman should have a knowledge of tire construction and be well versed in tire troubles and their causes in order to make proper diagnoses of the cases. This knowledge is necessary also in making adjustments on tire mileage, which is, in connection with the tire sales agency, a business very often established as an adjunct to the repair business.
The shop work of the repair man deals with casing troubles from punctures, blow-outs, rim cuts, blisters, stone bruises, and with the preparation of the tire for repairing, relining, retreading, and vulcanizing. Tubes have to be patched, spliced, and vulcanized. Valves in the tube stem will often cause trouble by leaking, but can be remedied by replacing with new valves. Sand blisters can be cured by opening the blister with a sharp knife, cleaning out the dirt and filling the hole with a self-curing rubber filler. A blow-out caused by a weak place in the casing usually due to a sand blister or stone bruise can be remedied by the inside method or a combination inside and outside method. Both methods consist in removing layers of fabric and applying fabric patches. When the outside has been properly built up with fabric and the chafing strips applied the cushion gum unit can be applied and the whole casing then placed in a sectional mold, where heat applied to both the inside and out will cure the job. Rim cuts are repaired in a similar way. Retreading is done by first cleaning down to the carcase and applying coats of vulcanizing cement upon which the tread can be built up and vulcanized. Reliners are vulcanized to the inside of a casing to take care of inside fabric breaks.
The work on the inner tube consists in patching to cover small holes, cuts, pinched tubes, and minor injuries.
Vulcanizing, which should be done on large patches, is also the best remedy for any repair. It is done by first cleaning the hole, preparing the patch, and placing and vulcanizing. Inserting new sections or splicing tubes is done by removing the damaged section, inserting a new one, and vulcanizing, one splice being made at a time.
Tools and Equipment
The equipment of a tire repair shop contains vulcanizers of many sizes which apply the heat through the use of gasoline, steam, or electricity. Vulcanizing moulds which are made to fit the tire are necessary for applying casing patches. Vulcanizing kettles, sidewall and retreading vulcanizers, benches, vises and holding forms are also to be found. The small tools required include flat and concave rollers, awls, stickers, rubber knives, large shears, wire brushes, tread gauges, fabric knives, pliers, scrapers, tread chisels and cement brushes. Splicing mandrels, try squares, tweezers, rules, spreaders and other devices and tools may be found in the equipment.
Disabilities
The work in a repair shop is not very strenuous, although it requires careful attention and speed. It is necessary that the man have the use of both hands and be able to see his work clearly. Deafness will not interfere to any great extent with his success. Lifting, stooping, or bending, while necessary to a small degree, is not common. The weight of a tire is the heaviest weight to handle around the shop.
There is little danger from poisoning or injury to skin, except as infection may be brought in with dirt on the tires. A man with leg disabilities will certainly not be debarred from this occupation if he can get around without great difficulty. It is possible to do some of the work while seated. A man having lost the use of certain neck movements would be able to handle tire repair work.