pressure relief door latch

I and 2, a pressurized structure 10 is provided with a dual-purpose door 12. Specifications include pressure release force ranging from 10 lbs. 3. However, the release joint system offers an advantage which can be significant during routine maintenance. PETE/1 C. 745EL ,4 T-TOF/YEV ACCESS AND PRESSURE RELEASE DOOR LATCH MECHANISM This invention relates to latch mechanisms for a dual-purpose aircraft door which will open at a predetermined internal pressure, and which can be quickly opened from its exterior for routine maintenance and inspection purposes. © 2004-2020 FreePatentsOnline.com. 5. By inserting the screwdriver into the recess 60 and applying hand pressure to the handle a mechanic can immediately rotate the pawl to reset the mechanism. 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. 1. A mechanism according to claim 3 wherein said spring member acts to urge said pawl in a first direction when said mechanism is in a closed position and in the opposite direction when said mechanism is in an open position.5. A force actuated latch mechanism for use in combination with an access and pressure relief door for a pressurized chamber. Therefore, for routine maintenance or inspection purposes, the door may be opened instantly, thereby eliminating time-consuming bolt removal situations associated with prior art access and pressure release doors. In modern aircraft, heated air under high pressure is ducted from the engines, through the nacelle structure and into the interior of other areas of the aircraft for purposes such as cabin pressurization and to prevent icing of leading edge surfaces. A related object is to provide an aircraft structural door system embodiment which will open 'to provide pressure relief and which is pivotally mounted to rotate about one end into a position wherein the pivotal mount will allow the door to leave the aircraft. 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. A force actuated latch mechanism for use in combination with an access and pressure relief door for a pressurized chamber. The release-type joint has the disadvantage that the door may leave the aircraft if actuated in flight. The holding moment for this embodiment will be equal to the product of the spring force and the minimum distance of line FL from the center of pin 34. to 45 lbs., up to 5 in. BRIEF DESCRIPTION OF THE DRAWINGS FIG. The aluminum model is ideal for exterior doors or whenever weight is a factor. 2. A mechanism according to claim 4 comprising a latch frame having a centrally disposed opening therethrough, and a pivot pin supported by said latch frame; wherein said pawl is rotatably mounted on said pivot pin so that in said open position said recessed portion will extend through said centrally disposed opening. [52] US. The latch mechanism is spring biased into a closed position where it responds either to a predetermined force acting upon the door, or to a leverlike implement operated by a mechanic, to move the mechanism to an overcenter open position, thereby allowing the door to open. In this embodiment the door 12 has an opening 30 over which a latch frame 32 is rigidly affixed. 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. A door system for controlling pressure withIn a pressurized chamber and for permitting quick access to said chamber comprising: a door member operably mounted on an exterior wall of said chamber; a latch mechanism having a closed position in which said mechanism is operably connected between said door and said wall comprising: means for holding said mechanism in said closed position; means responsive to a predetermined force applied to said door for actuating said mechanism from said closed position to an open position; means responsive to a predetermined contact force applied to said mechanism from the exterior of said chamber through an implement inserted into a recess in said mechanism for changing the position of said mechanism from either of said open or closed positions to the other of said positions; and said door system being responsive to a predetermined pressure within said chamber to actuate said mechanism to allow said door to open, and wherein the mechanism may be selectively actuated by contact forces applied directly to the mechanism.2. Awning] ... 1980-84 Sliding Door Handle Collar: 251843711A : 1985-1991 Sliding Door Handle Seal: 253845322 : 1985-1991 Weatherstrip Seal Middle Sliding Door Glass: 251411025C : 19mm Sway Bar: To open the door in such installations for routine maintenance or inspection purposes it is necessary to remove several bolts which anchor the spring. It will be apparent to persons skilled in this art that many modifications can be made to the preferred embodiment which has been disclosed.

Please refer to the 83 steel latch or the 93 stainless steel latch for other models with the same pressure release range. However, the pawl will not rotate until the counteracting moment slightly exceeds the holding moment, at which time the pawl 36 will begin to rotate about the pin 34. A force actuated latch mechanism for use in combination with an access and pressure relief door for a pressurized chamber. 4 shows the latch mechanism held in the open position.