Patent GB-1039613-A (GB)
Title: Improvements in or relating to apparatuses for absorption of energy from a moving load
IPC: B60R22/28
Filed: 1963-03-25
Abstract: 1,039,613. Seats. H. A. SON MOBERG. March 25, 1963 [March 26, 1962], No. 11726/63. Heading A4J. [Also in Divisions A3, B7 and F2] A device absorbing energy from a moving load, for arresting longitudinally movable vehicle seats, comprises an element which, when displaced with respect to a metal sheet, continually shears at least one strip from the sheet throughout the latter and continuously plastically deforms the sheared-off strip. The displaceable element may be linearly relatively movable; or comprise a tongue on an arm radially extending from a rotatable shaft, the tongue shearing off and plastically deforming a circular strip from a metal sheet. In Fig. 2, a metal sheet 25 is clamped by screws 22 between thick and thin rails 20, 21 longitudinally displaceable between rails 14, 15 interconnected at one end by a guide block 16 through which the rails 20, 21 pass. The rail 20 is provided with guide flanges 23 and with a lug 24 by which it is secured, e.g. to the chest strap of a safety seat belt. The rails 14, 15 have lugs 17, 18 by which, by a belt 19, they are secured, e.g. to a vehicle floor. The sheet 25 is broader than the rails 20, 21 and the opening in the guide block 16, so that when the chest strap is pulled to longitudinally separate the rails 14, 15 and 20, 21 two metal strips are sheared from the sheet 25 and compressed or folded against the block 16. In Fig. 6 (not shown) a sheet metal band 39 spirally coiled at one end, 43, extends through a channel 31 in a slide 30 and is secured by screws 42 between two plates 40, 41. The slide 30 has a lug 45 by which it is secured, e.g. to a safety seat belt, and the plate 40 has a lug 46 by which it is secured, e.g. to a vehicle body. Slide 30 comprises top and bottom plates 33, 32 and has a tongue 36 firmly welded to the top plate and extending through the channel 31 into an opening 37 in the bottom plate. Above the tongue the top plate has an opening 38 of at least the tongue width. The end of the band secured to the plates 40, 41 is slotted at 44 to receive the tongue. On separation of the slide 30 and the plates 40, 41 the spiral 43 is straightened, and a tongue-wide strip is sheared from the band 39 and urged into the opening 38 under plastic deformation by the tongue, the strip coiling itself as indicated at 47. In Figs. 8, 9 (not shown) a metal sheet clamped to a plate secured to a vehicle body has a strip sheared therefrom by a tongue connected to a safety seat belt by a steel wire guided in said plate. In Figs. 16-18 (not shown), for protection against load displacement in vehicles, a metal sheet is clamped between and overlaps first channel section beams passing through a sharp edged opening formed by second beams. On relative movement of the first and second beams the metal sheet overlapping edges are sheared off and plastically deformed against the second beam. Several such devices may be arranged in parallel or in series. The metal sheets, or strips sheared therefrom, may be of continuously varying thickness to continuously vary the shearing and deforming forces. Alternatively a stepwise force variation is obtained by assembling packs of metal sheets of different lengths.