Jamco Corporation

Yasuo Sekikawa

Tadashi Watanabe

Fumiaki Saku

Toshihisa Kasuya

A latch device for detecting pressure reduction of a cockpit in an aircraft and releasing a bolt and a stopper device are provided so as to prevent a cockpit door from unexpectedly opening by an impact. A main latch deviceof the cockpit door has a framefixed to a door panel, and a latch baseis mounted to the framecapable of pivotal rotation with a pinas a fulcrum. A boltis inserted into a catch in conjunction with a door handle. A holding/releasing portionholds the latch base. When a pressure difference occurs between a cockpitand a cabin, a pressure-sensing pistonis pushed in, a triggerand a flapperare rotated and the latch baseis released. A stopper deviceregulates movement of the triggerby movement of an inertial pistonwhen an impact force is applied from the cabinside.

Latch device of cockpit door of an aircraft

A cockpit door comprises a hingeprovided to one surface and a latch device provided to the other side that can be operated only from the cockpit side. To the inside of a door panel is disposed a reinforcement memberformed by laminating multiple layers of sheets with thermoplastic adhesives, the sheets formed by laminating aromatic polyamide fiber onto a honeycomb panel and processing the same into sheet form. A titanium alloy reinforcement plateis disposed to cover the gap Gbetween the door body and flap. Mounting portionsandare provided to the rim of the reinforcement member body, and rivet holesare provided thereto. The mounting portion is bent 90 degrees and fixed to the frame by rivets.

Cockpit door of aircraft

A cockpit door bodycan be opened toward a cockpit in a direction shown by arrow Rby a crew inside a cockpitby manipulating a knob on a first hinge deviceWhen rapid decompression occurs in the cockpit, a mechanical pressure-sensitive device of the first hinge deviceoperates to release a bolt from a catch. By the difference in pressure between the cabin and the cockpit, the door bodyopens in the direction of arrow Rto thereby reduce pressure difference. When rapid decompression occurs in cabina second latch devicedetects this pressure difference and operates mechanically to rotate a link leverto release a stopperfrom a catchFlapsandare opened toward cabinin the direction of arrow Rby the difference in pressure between the cockpit and cabin to thereby reduce pressure difference.

Growing community of inventors

Tokyo, Japan

Yasuo Sekikawa