| 摘要 |
A centrifuge has an upper wall formed with an inspection port, a cover engageable over the port, and an annular seal on the cover compressible against the port in a closed position of the cover. A hinge and operating assembly has a hydraulic cylinder/piston unit having one end pivoted on the housing, at least one pivot lug on the cover defining a cover axis, at least one pivot lug on the housing defining a housing axis parallel to the cover axis, and a support link having one end pivoted on the housing pivot lug at the housing axis and an opposite end defining a support axis. An operating lever centrally pivoted on the opposite end of the support link at the support axis has an end portion extending from the support axis and connected to the opposite end of the hydraulic unit and an opposite end portion on pivoted to one end of an operating link having an opposite end pivoted on the cover lug at the cover axis. When the unit is pressurized in the closed position of the cover the operating lever and operating link are pivoted so as initially to displace the cover axis in the closed position of the cover upward toward the support axis until the operating lever, in an intermediate position, engages the abutment and then pivots the cover about the housing axis away from the port into an open position of the cover.
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