Patent GB-1078806-A (GB)
Title: Improvements in devices for controlling operation of an aerial bomb
IPC: F42B10/56
Filed: 1964-08-04
Abstract: 1,078,806. Dropping bombs. R. A. ROBERT Aug. 4, 1964 [Aug. 5, 1963], No. 31113/64. Headings F3A and F3C [Also in Division F2] A bomb attached to an aircraft is connected to a parachute. The connection is in the inoperative condition as long as the bomb is not effectively released but assumes the operative condition as soon as the bomb is released. The connection is shown in Fig. 4 the bomb being attached to sleeve 32 and the parachute being -connected to the yoke 108. The latter is integral with a piston 81 which is connectible to the sleeve 32 by balls 84 being forced into groove 86 by a sheath 106 which is loaded by a spring 105 and the movement of which is controlled by a rod 41 and cap 57. When the bomb is in place on the aircraft, cap 57 abuts the bottom of the bomb dropping gear and is held in the position shown so that the rod 41 is prevented from moving upwards under the influence of spring 46 by balls 64 held in holes 65 abutting shoulders 61. The, arms of the yoke 42, Fig. 10, integral with the rod 41 connect the piston 81, sheath 106 and sleeve 33 by holding balls 74 to 77 in recess 78 of the piston. If the parachute is untimely extracted a spring spider 96 is deformed and the assembly formed by piston 81, sheath 106 and sleeve 89 is withdrawn from the sleeve 32. However, when the bomb is dropped the cap 57 moves upwardly under the influence of spring 69 permitting the ball 64 to be forced outwardly into recess 71 and thus allow the rod 41 to move upwardly. The yoke 42 allows the balls 74 to 77 to drop to the bottom of casing 112 so that springs 102 and 105 can move the piston 81 and sheath 106 to the left, sheath 106 being locked in position by engagement of recess 135 with split ring 134 to hold the balls 84 in engagement with recesses 86 to operatively connect the parachute to the bomb. At the same time as the rod 41 moves upwardly a timing device starts which controls the release of the parachute and the activation of the bomb fuze. A pin 161 normally prevents rotation of a spring-loaded cup 152 having a pinion 156 secured thereto but when the rod 41 moves upwards the pin 161 moves to a portion of the hub 157 of larger diameter so that the pinion 156 rotates under the action of the spring- loading. The pinion 156 drives gear 165, Fig. 13, having a drum 170 rotating therewith. A lever 174 pivoted at 175 bears on the inner periphery 172 of the drum. A nose 178, Fig. 15, on a disc 179 co-operates with a bead 177 on the lever 174 and a flat portion 183 of the disc shaft 180 co-operates with a spring-loaded plunger 185. The latter slides in a bore of a sleeve 189 connected to a cable 191 which controls the release of the parachute. The sleeve 189 is held in the position shown by balls 195 held in recess 196<SP>1</SP> by the rod 193. When the aperture 171 in disc 172 has rotated to be opposite the end of the lever 174 it permits the latter to pivot under the influence of the spring-loaded plunger 185 acting through shaft 180 and disc 179. The plunger 185 and the rod 193 can thus move to the left releasing balls 195 from the recess 196<SP>1</SP> so that the sleeve 189 can move under the influence of the spring 198 to the left and so actuate the release of the parachute. The end of the cable 191 passes through the two ends of a strap 221, Fig. 16, to connect them together and hold balls 222 in a position to retain end cap 226 of the parachute container. When the cable 191 is pulled out of the ends of the strap 221 by the movement of sleeve 189 the strap permits the balls 223 to move outwards so that spring 231 forces the end cap 226 off the container to release the parachute. The timing device also drives a disc 250, Fig. 22, having a recess 251 therein. A finger 260 on the end of a spring- loaded lever co-operates with the rim of the disc 250, the recess 251 therein being arranged to be opposite the finger 250 just after the release of the parachute so that the latter will pivot to cause an anchor-escapement to stop the timing device. If the parachute opens normally the deceleration will be sufficiently high to move the finger 260 out of the recess 251 to permit the timing device to resume its rotation. However if the high deceleration doesn't continue until the recess 251 has rotated past the finger 260 due, for example, to damage to the parachute, the finger will fall back into the recess 251 to block the timing device but if the deceleration remains high the recess 251 will rotate past .the finger 260 and then cannot be blocked so that the instantaneous fuze may then be armed by a lever 286 and an apertured cup-member 282, Fig. 13, co-operating with a device similar 'to that shown in Fig. 15. A device also arms the cap fuze at the same time.