Patents by Inventor Harold W. Stillman, Jr.

Harold W. Stillman, Jr. has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Metal ladder and method of fabricating the same
    Patent number: 4261436
    Abstract: A metal ladder is fabricated from a pair of spaced rails in which the rails have web portions which are provided at spaced intervals with inwardly directed embossments. Each of these embossments has an opening into which one end of a tubular rung is inserted and swaged to the rail. The embossments act as ribs to carry the load toward the flanges constituting the stiffer portions of the rail thereby increasing the strength and effectively reducing the web flexure and angle changes between the rungs and the rails, due to sideward forces in ladder use. By reason of the built in stiffness web thickness may be reduced resulting in savings in materials. Additionally, intermediate these embossments, just described, the web portion of each rail is formed with one or more outwardly directed embossments.
    Type: Grant
    Filed: January 17, 1980
    Date of Patent: April 14, 1981
    Assignee: Sears, Roebuck and Co.
    Inventor: Harold W. Stillman, Jr.
  • Method of fabricating metal ladder
    Patent number: 4205426
    Abstract: A metal ladder is fabricated from a pair of spaced rails in which the rails have web portions which are provided at spaced intervals with inwardly directed embossments. Each of these embossments has an opening into which one end of a tubular rung is inserted and swaged to the rail. The embossments act as ribs to carry the load toward the flanges constituting the stiffer portions of the rail thereby increasing the strength and effectively reducing the web flexure and angle changes between the rungs and the rails, due to sideward forces in ladder use. By reason of the built in stiffness web thickness may be reduced resulting in savings in materials. Additionally, intermediate these embossments, just described, the web portion of each rail is formed with one or more outwardly directed embossments.
    Type: Grant
    Filed: October 30, 1978
    Date of Patent: June 3, 1980
    Assignee: Sears, Roebuck and Co.
    Inventor: Harold W. Stillman, Jr.