| 摘要 |
A hatch cover and lock ring assembly is provided for use in sealing the hatch of a pressurized railroad hopper car, with the cover in sealing engagement with the upper lip of the coaming. There is a circular cover hingedly attached to the railroad car and having an elastomeric gasket attached to the bottom surface of the cover, adjacent its periphery to be compressible between the cover and the upper lip. An annular lock ring having end portions and a generally U-shaped cross section is held by retaining means in a uniform spaced relationship with respect to the cover. An over-center clamp mechanism is connected to the end portions of the lock ring and when locked, it draws the lock ring into tight sealing engagement about the cover and upper lip causing the cover to approach the upper lip, compressing the gasket therebetween for an air-tight uniform seal. The cover and lock ring assembly enables the use of a cover made from fiber reinforced plastic (FRP), rather than a heavier and more expensive aluminum or stainless steel casting, with improved sealing capability and less labor time and skill.
|
