US 5,333,976 A · Center locking spacing bolt

Abstract

A spacing bolt assembly for securing to a surface includes a cylindrical inner bolt portion having a first end with external threads in a first direction and a second end with a head structure, an outer bolt portion having an axial bore for receiving the inner bolt portion and having a first end with external threads in a second direction and having a second end, and an aperture in the surface containing a central bore segment sized and threaded in the first direction to receive the first end of the inner bolt portion and a counterbore segment sized and threaded in the second direction to receive the first end of the outer bolt portion, so that the outer bolt portion can be screwed into the counterbore segment to a depth leaving a desired exposed length of the outer bolt portion protruding, and the inner bolt portion can be inserted through the axial bore and screwed into the central bore segment until the inner bolt portion head structure abuts and engages with friction the second end of the outer bolt portion to lock the inner and outer bolt portions together against rotation in either direction. The aperture is preferably provided in a mounting base portion including a plate to place against the surface and into which the aperture extends, and a structure for fastening the plate to the surface. A mass of solid material preferably extends from the plate into the surface, into which the aperture extends from the plate.

Claims20

Dependent claims

A spacing bolt assembly for securing to a surface, comprising:

a cylindrical inner bolt portion having a first end with external threads in a first rotational direction and a second end with a radially protruding head structure,
an outer bolt portion having an axial bore adapted to receive said inner bolt portion and having a segment at said second end narrower than said radially protruding head structure and having a first end with external threads in a second rotational direction and having a second end,
an aperture in said surface containing a central bore segment sized and threaded in said first rotational direction to receive said first end of said inner bolt portion and a counterbore segment sized and threaded in said second rotational direction to receive said first end of said outer bolt portion,
such that said outer bolt portion can be screwed into said counterbore segment to a depth leaving a desired exposed length of said outer bolt portion protruding, and said inner bolt portion can be inserted through said axial bore and screwed into said central bore segment until said inner bolt portion head structure abuts and engages with friction said second end of said outer bolt portion to lock said inner and outer bolt portions together against rotation in either rotational direction.

1 more element

A spacing bolt assembly for securing to a surface, comprising:

a cylindrical inner bolt portion having a first end with external threads in a clockwise direction and a second end with a radially protruding head structure,
an outer bolt portion having an axial bore adapted to receive said inner bolt portion and having a segment at said second end narrower than said radially protruding head structure and having a first end with external threads in a counterclockwise direction and having a second end,
an aperture in said surface containing a central bore segment sized and threaded in said clockwise direction to receive said first end of said inner bolt portion and a counterbore segment sized and threaded in said counterclockwise direction to receive said first end of said outer bolt portion,
such that said outer bolt portion can be screwed into said counterbore segment to a depth leaving a desired exposed length of said outer bolt portion protruding, and said inner bolt portion can be inserted through said axial bore and screwed into said central bore segment until said inner bolt portion head structure abuts and engages with friction said second end of said outer bolt portion to lock said inner and outer bolt portions together against rotation in either direction,
wherein said outer bolt portion additionally comprises a radially protruding head structure at said outer bolt portion second end against which said inner bolt portion head structure abuts during locking.

2 more elements

Dependencies are inferred from the claim text.

Center locking spacing bolt

Life of this patent

Center locking spacing bolt

Life of this patent

Abstract

Claims20