Door latch for a pressure vessel

Details Door latch for a pressure vessel Door latch for a pressure vessel

1974-12-23

1976-06-08

Moore, Richard E.

Closure fasteners

Operators with knobs or handles

220244, E05C 504

Patent

active

039618170

ABSTRACT:
A pressure vessel such as a steam cooker has a novel variably sloped cam arrangement for sealing a warped access door against the inside of an access opening. Such access openings are typically of circular configuration, and the access doors are warped about one axis for insertion therethrough. The latching mechanism of this invention enables the door to be swung from an open position into a first position inside the pressure vessel and then to be moved rapidly into a second position in engagement with an inside rim of the access opening. This rapid movement is accomplished by rotation of an operating handle through a relatively small angle. Thereafter continued rotation of the handle stresses the access door, removing the warp therefrom and sealing the door against the inside rim of the access opening. The latter door stressing rotation produces relatively little motion of the door for a relatively large angular rotation of the operating handle. Thus there is achieved a relatively large mechanical advantage during the actual stressing of the door, while minimizing the amount of operating handle rotation required during that portion of door movement wherein a large mechanical advantage is not necessary.
There is further disclosed a novel shift plate arrangement which causes both rectilinear and angular shifting of the access door during movement between the above mentioned first and second positions. This avoids manual shifting of the door and enables door latching by merely swinging the door into the closed position and actuating the operating handle. Door opening is accomplished by a sequence which is the reverse of the latching sequence.

REFERENCES:
patent: 2548691 (1951-04-01), Vischer, Jr.
patent: 3409164 (1968-11-01), Vischer, Jr.

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