Expansion anchor
OwnerHitoshi Nagaiwa, Atsuko Nagaiwainventors
Life of this patent
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Abstract
An expansion anchor includes an anchor bolt, a nut, a spring washer, first and second outer metal plates, and first to fifth inner metal plates. Each of the first and second outer plates is subjected to the dovetail-correspondence elevation-angle bending-processing. The width of the first to fifth inner metal plates is set larger in the order of the fifth inner metal plate to the first inner metal plate, and the upper portions or the whole surfaces of the four side surfaces of the first to fifth inner metal plates are subjected to the chamfering-processing so that they become the continuation surfaces with the same inclination angle as the side-wall of the dovetail when the first to fifth inner metal plates are piled up in the same direction.
Claims9
An expansion anchor for use in combination with a dovetail, a mouth width of said dovetail being narrower than a bottom width of said dovetail, the expansion anchor comprising:
- an anchor bolt;
- two or more inner metal plates inserted into said dovetail;
- and
- two outer plates inserted between two side-walls of said dovetail and said inner metal plates,
- wherein each of said two outer plates has a substantially L-shaped cross-section which comprises a top plate portion and a side plate portion.
An elongated expansion anchor having a threaded portion in a center portion thereof, the expansion anchor being configured to engage a dovetail, a mouth width of said dovetail being narrower than a bottom width of said dovetail, the expansion anchor comprising:
- an anchor bolt;
- a nut;
- first and second outer plates;
- and
- two or more inner metal plates,
- wherein each of said first and second outer plates has a substantially L-shaped cross-section, which comprises a top plate portion and a side plate portion;
- and
- wherein a width of a first inner metal plate is selected to be greater than a width of a second inner metal plate.
An elongated expansion anchor having threaded portions in opposed end portions thereof, the expansion anchor being configured to engage a dovetail, a mouth width of said dovetail being narrower than a bottom width of said dovetail, the expansion anchor comprising:
- first and second anchor bolts;
- first and second outer plates;
- and
- an upper inner metal plate and a lower inner metal plate,
- wherein each of said first and second outer plates has a substantially L-shaped cross-section, which comprises a top plate portion and a side plate portion;
- and
- wherein each of said upper inner and lower inner metal plates includes first and second upper internal threaded portions formed in respective holes defined therein, to enable threaded engagement with said first and second anchor bolts.
A substantially cross-shaped expansion anchor having internal threaded portions defined in four end portions thereof, the expansion anchor being configured to engage a dovetail, a mouth width of said dovetail being narrower than a bottom width of said dovetail, comprising:
- first to fourth anchor bolts;
- first to eighth outer plates;
- and
- an upper inner metal plate and a lower inner metal plate, each including first through fourth projection portions, wherein:
- each of said first to eighth outer plates has a substantially L-shaped cross-section, which comprises a top plate portion and a side plate portion;
- said upper inner metal plate and said lower inner metal plate have a shape similar to the shape of said dovetail when viewed from a the same direction;
- and
- said first to fourth projection portions of each of the upper and lower internal plates respectively include threaded portions formed in respective holes defined therein, to enable threaded engagement with respective ones of said first to fourth anchor bolts.
Dependencies are inferred from the claim text.