| 摘要 |
Three concentric hollow cylinders, with radii for slidably loose interfitting, are coaxially assembled against separation and partially sealed by a combination slotted seal and detent, for telescoping outwardly when actuated by exhaust pressure from a sensing device to expose a formerly hidden strip on one of the cylinder sides, and then to open a passage to prevent back pressure from affecting the sensing device. The partial sealing prevents slight leakage of exhaust pressure from outwardly telescoping the cylinders. The expansion of the slotted seal and detent when not compressed by telescoping cylinders engages resetting cylinder edges that are rounded. The detent is operable to prevent resetting but is overridable manually, the slotted seal and detent being recompressable by the rounded surfaces engagement without damage.
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