Sheldon C. Coleman, grandson of the Coleman Co.'s founder, has been elected chairman. The younger Coleman, 35, succeeds his father, Sheldon Coleman, who died Sept. 21 at age 86. Coleman, the 88-year-old company’s third chairman, also is president and chief executive. Founder W. C. Coleman was chairman until his death in 1957. Coleman Co., which is based in Wichita, Kan., manufactures outdoor recreation equipment and home heating and air conditioning products.