Patent ID: 8083087

Claim:
A pressure vessel comprising: a housing including a side wall defining an opening into said housing; a lid spanning said opening, each of said side wall and lid including mutually engaging parts for securing said lid to said housing when said lid is in a closed position, said lid being rotatable relative to said housing from the closed into an open position whereby the lid can be removed from said housing; a drive connected between said lid and housing, whereby the lid can be rotated between its open and closed positions; a second drive connected to said housing and extending between the housing and said lid for raising the lid relative to the housing to expose said housing opening; a davit having an upper end secured to said lid and a lower end slidably supported against said housing side wall, said davit lower end shifting upwardly and downwardly relative to said side wall as said lid is raised and lowered relative to said housing; and a safety latch including an upper latch part connected to said lid and a lower latch part connected to said housing, said upper and lower latch parts being aligned when said lid is in its said closed position, said upper latch part defining a vented opening into the interior of said housing, said lower latch part carrying a plunger, said plunger having an inward position in which it protrudes into the upper latch part to seal said vented opening and an outward position from the vented opening allowing venting of said housing interior.