Patents Assigned to Allied Surveyor Supplies Mfg. Company
  • Patent number: 4441288
    Abstract: A sectionalized attachable rod survey monument of the type which is driven into the ground has a lower anchor pilot rod section and an upper rod section made of a solid aluminum alloy. An axial hole is drilled in the upper end of the pilot rod section and the lower end of the upper rod section to accept a stainless steel roll pin, and the two rods are separated by a stainless steel spacer washer. The spring pin becomes compressed when it is inserted into the holes in the ends of the rods and holds them together. The rods cannot physically be pulled apart under normal use; but when the upper rod is mechanically disturbed, such as when it is hit by road equipment or vandalized, the rods separate from one another. A permanent magnet is carried in the bottom of the hole in the lower pilot rod to permit detection of the marker location whenever the upper rod does become separated from the lower pilot rod.
    Type: Grant
    Filed: October 26, 1981
    Date of Patent: April 10, 1984
    Assignee: Allied Surveyor Supplies Mfg. Company
    Inventors: Gilbert J. Feldman, Richard A. Feldman