Improvements to the electrical switches by gravity and their application to the automatic devices for extinguishing fires on aircraft and the like

摘要

521,374. Fire - extinguishing. GRAVINER MANUFACTURING CO., Ltd., SALMOND, H. M., and MATHISEN, A. Nov. 17, 1938, No. 33428. [Class 47 (ii)] ] [Also in Group XXXVIII Automatically-operable fluid fire-extinguishers 3 for aircraft are provided with fuses controlled by (a) flame or temperature-responsive members 2, 2a associated with each of the engines b, (b) an inertia switch 12 in the nose of the fuselage a operative by impact due to an accidental crash. (c) push-button switches 13, 14, to'enable the pilot at-will to discharge the. extinguisher, and (d) a gravity switch 30 which operates if the aircraft overturns on landing, a switch 68 being also provided which prevents operation of the system when the aircraft is purposely flown upside down. The switch 68 may be operated by the undercarriage-retracting mechanism, by the wing slots, by altitude-responsive means, or by the engine-throttle, so as to be closed only when the aircraft is near the ground. Instead of operating the switch 68, these means may operate on a locking means for the gravity switch 30. The supply from the battery 9 is taken over twin-conductor cables, as 8; and terminal blocks 4, 70.