| 摘要 |
Apparatus ( 4 ) for removing a sealing plug from a bore ( 11 ), which sealing plug comprises an outer sleeve ( 13 ) and an inner stem ( 14 ) retained within the outer sleeve, the removal taking place after a suitable hole has been drilled part of the way into the stem, which removal apparatus ( 4 ) comprises a tapered punch ( 15 ) for forcible insertion into the hole in the stem ( 14 ) thereby to create an interference fit between the punch ( 15 ) and the stem ( 14 ) and thereafter driving the stem ( 14 ) out of the sleeve ( 13 ) whilst also retaining the stem ( 14 ) on the punch ( 15 ) by virtue of the interference fit, and sleeve-engaging means ( 16 ) engagable with the sleeve ( 13 ) after the punch ( 15 ) has removed the stem ( 14 ) from the sleeve ( 13 ), the sleeve-engaging means ( 16 ) and the punch ( 15 ) being thereafter removable from the bore thereby to remove both the sleeve ( 13 ) and the stem ( 14 ) from the bore whilst the sleeve ( 13 ) and the stem ( 14 ) are both retained on the appropriate parts of the apparatus.
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