| 摘要 |
<p>A pneumatic spring, more especially for serving as a height adjustable camera mounting, comprises a cylinder (18) containing pressurised fluid and accommodating a slidable plunger (22) which tapers to greater diameter at the outer end of the cylinder, where an annular groove (20) accommodates a radially expansible and contractable O-ring which seals against the tapered plunger.</p> |
