| 摘要 |
An extraction device ( 10 ) for facilitating removal of a sheared fastening element ( 13 ) in threaded engagement with a member ( 17 ). The extraction device ( 10 ) comprises of a hollow body ( 30 ) defining a cavity ( 33 ) for receiving an exposed portion of the sheared fastening element ( 13 ). The body ( 30 ) has a first face (31) onto which the cavity ( 33 ) opens to define an opening ( 35 ) through which the exposed portion ( 29 ) of the sheared fastening element ( 13 ) can be received, The cavity ( 33 ) has a boundary wall ( 35 ) with an inwardly stepped configuration ( 45 ) in the direction towards the opening ( 35 ). The stepped configuration ( 45 ) presents at least one edge ( 49 ) which facilitates welding of the body ( 30 ) to the exposed portion ( 29 ) of the sheared fastening element ( 13 ) received within the cavity.
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