Patents Assigned to Hedwin Corporation
  • Plastic drums and drum assemblies with preformed inserts
    Patent number: 4264016
    Abstract: A plastic drum assembly includes a preformed insert fused to at least a portion of the corner of the drum. In order to facilitate lifting and handling the drum, the insert is formed with a pair of indentations on opposite sides of a ridge. The method involves placing the preformed plastic insert across at least a portion of a corner of a mold cavity and blow molding the drum in the cavity to form the drum and fuse the drum corner to the insert. The disclosure also is concerned with methods for forming indentations in a blow molded plastic drum and with a method of reinforcing the corner of a blow molded drum.
    Type: Grant
    Filed: March 13, 1978
    Date of Patent: April 28, 1981
    Assignee: Hedwin Corporation
    Inventor: Charles A. Speas
  • Drum assemblies with preformed inserts
    Patent number: 4209104
    Abstract: A plastic drum assembly includes a preformed insert fused to at least a portion of the corner of the drum. In order to facilitate lifting and handling the drum, the insert is formed with a pair of indentations on opposite sides of a ridge. The method involves placing the preformed plastic insert across at least a portion of a corner of a mold cavity and blow molding the drum in the cavity to form the drum and fuse the drum corner to the insert. The disclosure also is concerned with methods for forming indentations in a blow molded plastic drum and with a method of reinforcing the corner of a blow molded drum.
    Type: Grant
    Filed: March 13, 1978
    Date of Patent: June 24, 1980
    Assignee: Hedwin Corporation
    Inventor: Charles A. Speas
  • Method of making plastic drum assemblies with preformed inserts
    Patent number: 4207284
    Abstract: A plastic drum assembly includes a preformed insert fused to at least a portion of the corner of the drum. In order to facilitate lifting and handling the drum, the insert is formed with a pair of indentations on opposite sides of a ridge. The method involves placing the preformed plastic insert across at least a portion of a corner of a mold cavity and blow molding the drum in the cavity to form the drum and fuse the drum corner to the insert. The disclosure also is concerned with methods for forming indentations in a blow molded plastic drum and with a method of reinforcing the corner of a blow molded drum.
    Type: Grant
    Filed: April 13, 1977
    Date of Patent: June 10, 1980
    Assignee: Hedwin Corporation
    Inventor: Charles A. Speas