An anchor for resisting a pulling force applied to a cable includes an expandable outer shell disposed in an opening in a floor, an outer wedge disposed in the shell and having wedge-shaped projections engaged with the inner wall of the shell, and a rotatable inner wedge below the outer wedge engaged with a short length of chain extending through the shell. A cable to be tensioned is attached to the short length of chain. Tension on the cable urges the inner wedge upwardly against the outer wedge which, in turn, is wedged in the interior of the shell to forceably expand the walls of the shell radially outwardly to embed the shell in the floor. The inner wedge is rotatable axially relative to the outer wedge between a first position, in which a wedging force is applied to the outer wedge in response to tensioning of the cable, and a second position, which allows removal of the inner wedge and the short length of chain from the outer wedge and the shell.
A magic square comprised of a central bearing having six joint axles respectively associated with six central surface segments rotatably secured thereon, twenty edge surface segments being fit in the space formed by the central surface segments to form a three-dimensional square block. Each of the central surface segments comprises a through hole having an inside diameter larger than the joint axle to be rotatably fit on the joint axle. Each of the joint axles has an expanded end with a cone-shaped camming surface, the expanded end defining a step with the joint axle. A pair of diametrical slits in the form of a cross are formed on the expanded end to provide a resilient inward deformation when the expanded end is contacted by the through hole of the central surface segment to allow the expanded end to penetrate and pass the through hole and then expand back to its original shape to have the step abut against the peripheral edge of the through hole and thus retaining the central surface segment on the joint axle.
An anchor device that is comprised of but two parts, a core that has a cylindrical body portion and a sleeve having an inside diameter that matches the body portion. The core has an end cap that is adapted for attachment to a power post or the like. The sleeve is positioned over the core and a restriction resists full seating of the core in the sleeve. When positioned in the hole of a concrete floor, the core is forced into the sleeve e.g., with a tool designed for that purpose. This expands the sleeve into the concrete and seats the core in the sleeve, and the combination sleeve.
An anchored tie-down ring that mounts in or on a concrete surface to which a movable object can be secured. One embodiment includes a generally U-shaped ring with a hollow cylindrical crossbar that sits within a cavity in a block mounted flush with a concrete surface. One end of each of a pair of legs fits into the crossbar and acts as a bearing on which the ring pivots. The legs extend through the block into the concrete as an anchor. Another embodiment includes a generally U-shaped ring that is pivotally mounted in a block. Anchor bolts extend through holes in the block into the concrete surface. A rounded cover is secured to the block, denying access to the anchor bolts, and includes a cavity so that the ring lays horizontally within the cover when not in use.
