US A,3704845, B64C 1/10
Patent owner: Michael Ord, 5267 Wilkins Avenue, Pittsburgh, Pa.
Patent name : AIRPLANE
HIJACKING PREVENTION SYSTEM
cockpit is isolated from the cabin to give passengers a sense of safety, but
communication must be ensured. The buttons fixed in the cabin keep the cockpit
informed of such things as oxygen shortage, fire alarm, medical accident, device
fault and any other trouble.
isolating door between the cockpit and the cabin is restricted, and the door and
its associated isolating walls are made of bulletproof materials.
voice communication system of the audio system is a one-way system from the
cockpit to the cabin, preventing the words of the hijackers from being heard.
invention warns the passengers in advance.
The key idea of the patent is that the pilots are locked in the cockpit
so that the hijackers can not communicate with the pilots. Even if the hijackers
hold any hostage, the pilots will not open the cockpit without hearing anything.
Even if the hijackers do as indicated in Fig. 4 22, the pilots may choose to
stay if the situation is not critical.
US patent invention does not allow for any possible neglect of the pilots.
pilots may not come even if all buttons in Fig. 4 22 are pressed.
the bulletproof wall and door of the cockpit soundproof? The hijackers know
The US patent invention in 1972 has drawn
upon the experience of the previous three patents of China but still leaves much
to be desired. By contrast, the double-door structure specified in Mr. Zhen-man
Lin patent is original, the “Single-person checkroom” is a natural evolution
of modern technology, and the five-finger mold is unprecedented. The
single-person checkroom of the double-door structure precludes the effect of
human factors and the five-finger mold makes the system flawless. The hijacking
prevention system of Mr. Zhen-man Lin is so original that the US patent
application does not affect the patent application of Mr. Zhen-man Lin.