| 摘要 |
The present invention relates to downhole apparatus permitting separation of one part of downhole equipment from another part thereof. The invention provides downhole apparatus (2) comprising a first part (4) connected to a second part (6) by connecting means which limits axial and rotational moveme nt between said parts. The connecting means comprises a connecting member (22) having first and second ends connected respectively to the first and second parts (4, 6). The connection of the first and second ends of the connecting member (22) is such as to limit axial and rotational movement relative to th e respective first and second parts (4, 6). The connecting member (22) is provided between said first and second ends with a region of weakness in the connecting member provided by weakening means (28), and with means for minimising stress generated in the connecting means at said region of weakne ss when torque is transmitted in use between the first and second parts (4, 6) via the connecting member (22).
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