| 摘要 |
The present invention is an improved hoist coupling for use with anchors having an anchor shaft terminating in an anchor head and embedded in a concrete load in such a way that a portion of the anchor shaft and the anchor head is exposed and protrudes from the concrete body. The novel hoist coupler of this invention comprises a coupler body having an underside which is oriented towards and is seated against the load to be lifted, a socket formed in the upper side of the coupler body, in which socket is defined a ring bearing surface, and a hole in the underside of the coupler body opening into the socket for receiving the head of an anchor. A ring is seated for rotation on the ring bearing surface about a ring axis perpendicular to the anchor shaft. A circumferentially extending slot is defined in the ring, the slot including at least one opening of enlarged diameter relative to the width of the slot. The enlarged slot opening is sufficiently large to admit the head of an anchor into the ring, while the slot width is narrower than the anchor head diameter but slightly wider than the anchor shaft diameter. A yoke element extends axially through the ring, and has an anchor head receiving recess in overlying alignment with the hole in the coupler body. A bail is pivotably connected to the yoke about an axis parallel to the ring axis, but offset therefrom in a direction away from the yoke recess and coupler body. The ring is rotatable between a first load receiving position wherein the enlarged ring opening is in alignment with the yoke recess and the hole in the coupler body for admitting an anchor head through the body and the ring into the yoke recess, and a second load locking position wherein the ring is rotated to move the enlarged opening out of alignment with the recess and the hole such that the anchor shaft extends through the coupler body hole and the ring slot but the head is locked against withdrawal from the yoke recess by the reduced width of the ring slot. |
