| 摘要 |
A lock washer (10) for assisting with connection between at least a first section (26) and a second section (28) of a drill string (24), the first section having a zone (30) at or towards an end of the first section (26), the first section zone (30) having an outer perimeter (34) with a cross-sectional shape and size, and the second section (28) having a zone (32) at or towards an end of the second section (28), the second section zone (32) having an outer perimeter (36) with a cross-sectional shape and size, the lock washer (10) including: a first part (12) having an inner perimeter (16) with a cross-sectional shape and size which substantially complements the first section zone (30) cross-sectional shape and size such that the first part (12) is able to slide along the first section zone (30) in a direction parallel to a notional axis of the first section zone (30), and such that the first part (12) is substantially prevented from rotating with respect to the first section zone (30); and a second part (14) having an inner perimeter (18) with a cross-sectional shape and size different from the first part inner perimeter (16) cross-sectional shape and size, and which substantially complements the second section zone (32) cross sectional shape and size such that the second part (14) is able to slide along the second section zone (32) in a direction parallel to a notional axis of the second section zone (32), and such that the second part (14) is substantially prevented from rotating with respect to the second section zone (32), wherein the first part (12)and the second part (14) are joined such that they are prevented from rotating with respect to each other. 18912 Specification 3, 2-0 -0 4-3 2 PIdC). |
