| 摘要 |
A pressurised fluid cylinder having a shut-off valve, comprising a valve element 6A on a valve stem 18A which is linearly movable. A biasing member 15A exerts a biasing force on the valve element and a crank moves the valve stem. The crank comprises a first linkage 37 pivotally attached at one end to the valve stem and a second linkage 50 pivotally attached at one end to the second end of the first linkage and being positionally fixed but rotatable about the opposite end. Rotation of the first linkage in a first rotational direction initially causes biasing of the biasing member and further rotation of the second linkage causes the linkage to pass a top or bottom dead centre position, at which point a proportion of the energy stored in the biasing member during its biasing causes the first linkage to be biased further in the first rotational direction after the top or bottom dead centre position. |
