| 摘要 |
<p>1530036 Rotary energy absorbing devices BOEING CO 11 June 1976 [6 Oct 1975] 24369/76 Heading F2S [Also in Division B7] A hydrofoil craft 20 has a retractable strut 22 carrying a foil 26 and being rotatable by an actuator 36 to thereby serve as a rudder; a shearing means 30 is employed for absorbing impact energy and comprises a pair of outer plates 50, 52 mounted to a strut plate 54 which is itself splined to a strut axle 40. The plates 50, 52 are mounted to plate 54 by bolts 60 and also by four sets of three dowel shearing pins 61, 62, 63, 64 received in sets of sequentially larger slotted chamfered holes 71, 72, 73, 74 in strut plate 54. The strut plate 54 is further provided with a tang portion 86 splined to plate 54 by pins (88) and engageable upon rotation of plate 54 with either stop means 90 or stop means 100. Each stop means 90 or 100 comprises a first portion 92 or 102 rigidly attached to the craft's structure 34 and thereabout a telescoping second portion 94 or 104 connected by three sets of shearing bolts 96, 97, 98 or 106, 107, 108, respectively, located in sequentially larger slotted chamfered holes (110, 111, 112) and (120, 121, 122) respectively. Should an impact cause strut rotation, energy is absorbed first snapping of bolts 60, then by each set of pins 61, 62, 63, 64 consecutively bending and then shearing, by the sets of pins 96, 97, 98 or 106, 107, 108 bending and shearing as portion 94 or 104 telescopes on portion 92 or 102 and then by tong portion 86 shearing.</p> |
