Abstract: An energy absorbing device used as a load limiting member in a structure to control its response to applied loads is disclosed and functions by utilizing a spool assembly 20 having flanged ends 36 and an interior cavity 34 of sufficiently large diameter to cause it to deform plastically at a prescribed load. In application, the spool 20 is utilized as a pivot point for the legs 14 of an aircraft seat 12. When properly designed and integrated into the seat arrangement 10, the spool 20 will twist about its axis, deforming plastically when the impact load exceeds the spool yield value. Through this deformation, spool 20 absorbs the kinetic energy of the movement of seat 10 at a substantially constant rate, thereby controlling the level of loads transmitted to the seat occupant. By proper sizing and selection of materials, it is possible to control load response in a predictable manner.

Abstract: This invention relates to a hand held hydraulic cutting tool particularly useful to deactivate ejection seats in military aircraft rescue operations. The tool consists primarily of a hydraulic system composed of a fluid reservoir 11, a pumping piston 16, and an actuator piston 26. Mechanical cutting jaws 28, 29 are attached to the actuator piston rod 26. The hydraulic system is controlled by a pump handle 18. As the pump handle 18 is operated the actuator piston rod 26 is forced outward and thus the cutting jaws are forced together. The frame of the device is a flexible metal tubing 30 which permits easy positioning of the tool cutting jaws in remote and normally inaccessible locations. Bifurcated cutting edges 28a and 28b ensure removal of a section of the tubing or cable (40, FIG. 3) to thereby reduce the possibility of accidental reactivation of the tubing or cable being severed.