Piering device with adjustable helical plate
OwnerRobert L. Jonesinventor
Life of this patent
Estimating the term…
Abstract
A piering device includes a shaft having a polygonal cross-section with a series of notches spaced at intervals along the vertices of the shaft. For example, the shaft can have a square cross-section with rounded corners. The helical plate has a passageway with a cross-section to slide along the shaft when the helical plate is in a first rotational position on the shaft. However, notches within the passageway of the helical plate engage the notches on the shaft when the helical plate is rotated to a second rotational position, thereby preventing the helical plate from sliding along the shaft. A key is inserted between the shaft and helical plate to hold the helical plate in the second rotational position and thereby fix the axial position of the helical plate on the shaft.
Claims16
A piering device comprising:
- a shaft having a polygonal cross-section and a plurality of vertices, with a plurality of notches axially spaced at intervals along the shaft at the vertices;
- a helical plate having a passageway with a cross-section to slide along the shaft in a first rotational position on the shaft, and having notches within the passageway to engage at least one of the notches on the shaft when the helical plate is rotated to a second rotational position on the shaft so that the helical plate cannot slide along the shaft;
- a key insertable between the shaft and helical plate to hold the helical plate in the second rotational position and thereby fix the axial position of the helical plate on the shaft.
A piering device comprising:
- a shaft having a polygonal cross-section and a plurality of vertices, with a plurality of notches axially spaced at intervals along the shaft at the vertices and aligned to form partial threads around the shaft;
- a helical plate having a passageway with a cross-section to slide along the shaft in a first rotational position on the shaft, and having threads within the passageway to engage the partial threads on the shaft when the helical plate is rotated to a second rotational position on the shaft so that the helical plate cannot slide along the shaft;
- and
- a key insertable between the shaft and helical plate to hold the helical plate in the second rotational position and thereby fix the axial position of the helical plate on the shaft.
A piering device comprising:
- a shaft having a substantially square cross-section with a plurality of notches axially spaced at intervals along the corners of the shaft and aligned to form partial threads around the shaft;
- a helical plate having a passageway with a cross-section to slide along the shaft in a first rotational position on the shaft, and having threads within the passageway to engage the partial threads on the shaft when the helical plate is rotated to a second rotational position on the shaft so that the helical plate cannot slide along the shaft;
- and
- a key insertable between the shaft and helical plate to hold the helical plate in the second rotational position and thereby fix the axial position of the helical plate on the shaft.
Dependencies are inferred from the claim text.