| 摘要 |
A telescopic piston assembly comprises a housing 1 containing an inner component 2, an intermediate component 3 and an outer component 6, all telescopingly interfitted together. The inner component 2 comprises a fluid outlet at one end, the intermediate component 3 making a sliding seal 5 with the inner component 2 and comprising a closed end surrounding the fluid outlet end. The outer component 6 makes a first sliding seal (12, FIG. 7) with the intermediate component 3 and a second sliding seal 13 with the inner component. A detent 4 operates to hold the outer component 6 in an extended position relative to the inner component 3.
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