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Wedge anchor

Wedge anchor has a shank with an expander section having a surface that forms an angle greater than 8° with respect to an axis of the shank. A plurality of longitudinal ribs project radially and outwardly from the expander section, extend along the axis of the shank, and are angularly spaced apart from each other. A tubular expansion sleeve is sleeved on a neck section of the shank adjacent to the expander section, and is formed with a plurality of axially extending slits for engaging the longitudinal ribs when the expander section is extended into the expansion sleeve.

Therefore, the object of the present invention is to provide a wedge anchor that can be driven quickly into a blind hole and that can ensure a stable securing effect.

According to the present invention, a wedge anchor includes a shank, a tubular expansion sleeve, and a nut fastener. The shank has a threaded section, a neck section extending forwardly and coaxially from one end of the threaded section, and having a diameter smaller than that of the threaded section, and an expander section extending forwardly and coaxially from one end of the neck section, and having a cross-section that gradually decreases along an axis of the shank in a direction toward the threaded section. The expansion sleeve is shorter than the shank and is sleeved on the neck section. The nut fastener engages the threaded section of the shank.

The expander section has a surface that forms an angle greater than 8° with respect to the axis of the shank, and is further formed with a plurality of longitudinal ribs that project radially and outwardly, that extend along the axis of the shank, and that are angularly spaced apart from each other. The expansion sleeve is formed with a plurality of a axially extending silts for engaging the longitudinal ribs on the expander section when the expander section is extended into the expansion sleeve.

The slits configure that expansion sleeve with an annular base strip portion and the more than two retaining plates, each having a base edge connected to the base strip portion, a pair of parallel lateral edges, and a curved distal edge that interconnects the lateral edges and that curves forwardly in a direction away from the base strip portion. The lateral edges of adjacent ones of the retaining plates confine the slits. The curved distal edges of the adjacent ones of the retaining plates cooperate to form entrances into the slits. Each of the retaining plates is formed with a boss that projects radially and outwardly with respect to the shank.

Because a relatively short expander section is needed to expand the retaining plates, the shank of the wedge anchor has a lower material requirement as compared to the aforesaid conventional wedge anchor thereby resulting in lower costs. In addition, a shorter length of the shank projects from the wall due to the shorter distance traveled by the shank when expanding the retaining plates. The shorter projecting length of the shank can facilitate subsequent bracket mounting and locking operations.

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