Quick release from the outside of the chamber is achieved by insertion of a simple implement such as a screwdriver and application of hand pressure. with suction cupsAutomatic catches, i.e. 5 is a cross section of the latch taken along line 5-5 in FIG. 244/ 129X 3,426,984 2/1969 Emmons 98/1.5X 3,451,702 6/1969 Little 49/ 379 3,453,777 7/1969 Reilly .11.. 49/141 Primary Examiner-,1. to 45 lbs., up to 5 in. United States Patent Peter C. Abeel Kent, King, Wash. [22] Filed June 27, 1969 [45] Patented Mar. The preferred embodiment relates to a combinedpressure ,relief and access door for an aircraft nacelle structure wherein the door is pivotally mounted near its forward or upstream edge and is provided with a spring-biased overcenter latch mechanism near its aft or downstream edge. In a similar fashion, the recess 60 may be replaced with other suitable shapes which would provide a means for allowing a mechanic to apply forces counteracting the holding forces on the pawl. ABEEL PETER C It has been found necessary to provide numerous blowout" or pressure relief doors to prevent failure of skin panels and other major structural components in the event a bleed air duct should rupture.
In this closed position of the latch mechanism, a surface 40 of pawl 36 is in bearing contact with a surface 41 of frame 32. released by pull or pressure on the wing with a bifurcated latchFuselages; Constructional features common to fuselages, wings, stabilising surfaces and the likeFuselages; Constructional features common to fuselages, wings, stabilising surfaces and the like comprising decompression panels or valves for pressure equalisation in fuselages or floorsGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTSTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATIONAccess and pressure release door latch mechanism
A lug portion 44 is shaped to provide a stop member for abutting contact with a frame surface 45 to establish the open position of the latch shown in FIG. The above objectives have been achieved by the provision of a unique overcenter latch mechanism'in combination with an access door which ispreferably pivotally mounted for initial movement. The relief valve of claim 1 wherein the valve is a fail safe closed safety relief valve wherein the sensor assembly is set to so that upon reaching a desired system pressure sacrificial failure of the buckling pin occurs, thereby triggering the latch to open the valve. The release-type joint has the disadvantage that the door may leave the aircraft if actuated in flight.
To open the door in such installations for routine maintenance or inspection purposes it is necessary to remove several bolts which anchor the spring. The force acting on nose portion 38 will create a counterclockwise moment tending to counteract the holding moment imparted through spring plate 46.
It is apparent that the spring plate 46 applies a clockwise holding moment to the pawl 36 which is reacted by the latch frame at surface 41. It will be apparent to persons skilled in the mechanical design art that the loads tending to open the latch mechanisms, for any given internal pressure acting upon the door, may be readily computed from well-known force balance principles. The recess 60 is preferably shaped to receive and nest the pointed blade of a screwdriver or similar implement. KNAPPCO AND CIVACON ACCESS DOORS. It: Opens inward at a specified pressure setting relieving pressure within the duct to equalize the pressures. Pawl surface 42 is shaped to present a smooth flush exterior contour within the opening 30.
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