Dual-process Equipment for Vulcanizing
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IT is now generally recognized that for I a trustworthy and efficient repair of an inner tube, vulcanizing is far superior to the old-fashioned method of patching.
here are two systems of vulcanizing —automatic, which is suitable for tubes having walls of a thickness up to but not exceeding .fr in., and timed repairs.
By the automatic method the vulcanizer is raised to a suitable temperature, and the tube with the repairing material in position, is placed upon it and clamped down. When the repair is completed, the heating current is automatically cut off and the equipment, with the tube in position, can be left until it is convenient to remove it.
For the repair of tubes thicker than this and for the fitting of valves, it is necessary to work to a time-table and allow a period which is determined by the thickness and size of the patch, or the dimensions of the valve, and so on.
A new item of equipment from William Frost Products, Ltd., Fernhead Road, London, W.9, enables the operator to carry out repairs by either the automatic or the timed procedure. This vulcanizer known as the Ulric, is made in two models, the Junior and the Major. An interesting feature of both is the method of control. There is a control switch which is selective for automatic or timed vulcanizing. A red signal light indicates that the current is switched on, and this is followed by a green light, which shows that vulcanizing temperature has been reached.
For automatic vulcanizing the repair is placed on the vulcanizer when the green light shows. The current is then switched off. The vulcanizing proceeds and it is immaterial bow long the repair is left in place, as over-vulcanizing is impossible.
In addition to repairs to any puncture or tear, or even burst, all straightstemmed and rubber-faced valves can be reseated. A simple preparatory treatment is all that is required before vulcanizing. When treated, the final repair Os flush on both sides and the new material is integral with the tube.
The price of the Junior is 1.14 I4s. and the Major £22 10s.