Thomas Heyward , Jr. ( July 28 , 1746 -- March 6 , 1809 ) , was a signer of the United States Declaration of Independence and of the Articles of Confederation as a representative of South Carolina . Thomas Heyward , Jr. ( July 28 , 1746 â `` March 6 , 1809 ) was a signer of the United States Declaration of Independence and of the Articles of Confederation as a representative of South Carolina .