| 摘要 |
An axially expanding spacer (10) has respective first and second spacer r ings (11,12) with complementary helical ramped faces (16,17) and abutment fa ces (18,19). By relative rotation of the spacer rings (11,12), the height of the spacer (10), between annular faces (14,15) can be expanded or contracte d. Compression springs (20) between the abutment faces (18,19) urge the spac er (10) to its "expanded" configuration.
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