PARACHUTE DEPLOYMENT DEVICE Russian patent published in 1995 - IPC

FIELD: parachute technique. SUBSTANCE: device has aneroid-operated mechanism 1, clockwork mechanism 2, interlocking levers 3 located in housing 4, lock 5, pull mechanism 6 secured to housing 4 from beneath which has cord 7 in flexible protective casing 8 connected to two-cone lock 9 of parachute. Fitted on lateral surface of housing 4 is input mechanism which has additional flexible protective casing with cylinder-housing at free end and rod with piston. In the front portion of piston there is profiled seat for calibrated locking ring; sealing ring is provided in central portion and split collet of decoupler is arranged in rear portion. Tip of ear with line is fitted in split collet of decoupler. In case of loading the line, force is transmitted via ear, tip and split collet of decoupler to piston and then to calibrated locking ring received by the seat. As soon as force reaches critical value P_cr , calibrated locking ring spreads freeing the piston which starts moving in cylinder-housing pulling the rod from balance beam. As soon as split collet of decoupler is not engageable with cylinder any longer, its tabs open and spherical tip gets disengaged freeing the ear with line. Motion from clockwork mechanism 2 is transmitted via gear train to interlocking levers 3 or open lock of pull mechanism 6 or stop clockwork mechanism 2 if the flight altitude exceeds the value set on the instrument dial. As soon as preset altitude has been achieved, interlocking levers 3 are released due to compression of aneroid and clockwork mechanism completes remaining time 0.8 to 1.2 s and switches on lock 5 which releases piston of the instrument. Under action of compressed springs, the instrument piston starts moving and pulling cord 7 in protective casing 8 and opens two-cone lock 9 of parachute. EFFECT: enhanced reliability due to enhanced tightness of mechanism switching on the device and maintenance of stable operation of device throughout entire range of application. 2 dwg