Patents Assigned to White Metal Rolling & Stamping Corporation
  • Stepladders
    Patent number: 4079814
    Abstract: Stepladders are made of extruded aluminum metal parts including special bracket members for the rear prop section and the bucket rack that mitigate torsional twist. Cross bracings for the rear prop section and bracings of the front section are structured to prevent pantographing or rotation and reduce to a minimum the number of rivets required for ladder assembly thereby providing strong, safe ladders of light weight and low cost.
    Type: Grant
    Filed: March 9, 1977
    Date of Patent: March 21, 1978
    Assignee: White Metal Rolling & Stamping Corporation
    Inventor: Clayton E. Larson
  • Ladders incorporating retractable ground spikes
    Patent number: 4039047
    Abstract: The safety of ladders is improved by providing them with pivoted foot members that carry ground spikes that rest against the foot member when not in use and rotate for ground penetration into a position in which the foot member exerts leverage to dig the spikes into the ground.
    Type: Grant
    Filed: May 26, 1976
    Date of Patent: August 2, 1977
    Assignee: White Metal Rolling & Stamping Corporation
    Inventors: Clayton E. Larson, Earl T. Records
  • Stability stepladders
    Patent number: 4011926
    Abstract: Stepladders having good lateral stability comprise a pair of channel members of fixed length pivoted at their top end to the side rails of the front ladder section to swing between a closed position and an extended position. The bottom ends of each channel member carries a foot member which always extends below the bottom end of the front section side rails so that the front section is supported in use of the ladder exclusively upon said foot members and not upon the bottom ends of the side rails.
    Type: Grant
    Filed: April 12, 1976
    Date of Patent: March 15, 1977
    Assignee: White Metal Rolling & Stamping Corporation
    Inventors: Clayton E. Larson, Edwin H. Lemp
  • Extension ladder with ladder leveler means
    Patent number: 3948352
    Abstract: A extension ladder formed of interlocked top and bottom sections has ladder leveler means comprising a pair of sleeve members that slideably encompass the lower end of the bottom section siderails. A short flange on each sleeve member is captivated by a guide member carried on the inside of each lower siderail permitting the sleeve members to be securely retained in operative position on the bottom of the ladder without interference with the free sliding of the ladder top section along the bottom section.
    Type: Grant
    Filed: July 15, 1975
    Date of Patent: April 6, 1976
    Assignee: White Metal Rolling & Stamping Corporation
    Inventors: Clayton E. Larson, Edwin H. Lemp