Electric heating – Metal heating – By arc
Patent
1995-03-07
1996-05-21
Shaw, Clifford C.
Electric heating
Metal heating
By arc
219 75, B23K 928
Patent
active
055191851
ABSTRACT:
The invention is a method of insulating an electric welding torch and the torch produced by the method. The insulation is applied in three layers. The inner layer applied directly over the metallic elements is preferably a heat resistant elastomer such as silicone rubber. The middle layer is a reinforcing fiber, preferably a heat resistant glass cloth. The outer layer is also a heat resistant elastomer. The preferred manufacturing method is to apply the first two layers and compression mold this to form a first assembly. After trimming any flash another layer of heat resistant elastomer is applied over the outside and the product is again placed in a compression mold. The process compensates for the very poor flow characteristics of the elastomer, ensures that the reinforcing is well contacted and wet out by the elastomer, and produces a product of excellent appearance and durability.
REFERENCES:
patent: 1314674 (1919-09-01), Kuntzmann
patent: 2163486 (1939-06-01), De Long
patent: 3610866 (1971-10-01), Harvey et al.
patent: 3634643 (1972-01-01), Himmelman
patent: 3823320 (1974-07-01), Muehlberger
patent: 4771158 (1988-09-01), Kleppen
patent: 4788401 (1988-11-01), Kleppen
patent: 5162632 (1992-11-01), Carkhuff
C-K Worldwide Inc.
Gehr Keith D.
Shaw Clifford C.
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