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US 4,042,193 AGranted
Safety device for aircraft doors or hatches
AssigneeVereinigte Flugtechnische Werke-Fokker GmbH
InventorGerd Cerne
Life of this patent
Estimating the term…
Abstract
A door or hatch operating mechanism is blocked by a bolt when the aircraft moves in that dynamic pressure is sensed by a spring biased displaceable large piston moving a small piston which acts on a hydraulic link acting, in turn, on another spring biased piston which holds the bolt in locking position or releases it.
Claims6
In a device for securing door or hatch locks in aircrafts having manually operable means for unlocking and opening the door or hatch, the combination comprising:
- transducer means including a piston means disposed to be displaced in response to dynamic pressure developed upon movement of the craft;
- a bolt disposed for selectively securing and releasing the manually operable means, thereby respectively impeding and permitting manual unlocking and opening of the door or hatch;
- a piston connected to said bolt for operating same;
- and
- control means including a hydraulic connection connected to the transducer means to be responsive to presence or absence of a dynamic pressure as sensed by the transducer means, and as displacing the piston means, thereby displacing hydraulic fluid in said hydraulic connection which then operates said piston thereby operating said bolt in response to said presence and absence of the dynamic pressure as sensed.
2 more elements
Dependencies are inferred from the claim text.