| 摘要 |
A top drive apparatus comprising a top drive (20) having a main shaft (528), an item (522) connected to the main shaft (528), and a body (600) depending from the top drive (20), characterised in that the body (600) comprises a first splined member and the item (522) has a second splined member (524) for engaging with said first splined member for selectively inhibiting rotation of the item to facilitate breaking the connection between said main shaft (528) of said top drive. The present invention also provides a method for facilitating removal of an item connected to a main shaft (528) of a top drive (20), the method comprising the steps of engaging a first splined member (604) of a body (600) depending from said top drive (20) with a second splined member (524) of said item (522), rotating said main shaft (528) of said top drive (20) to break the connection said item (522) from said main shaft (528), preferably the method further comprises the step of resting the item, such as an internal blowout preventer on said splined member. |
