초록 ▼

The device includes an inverted first cup shaped member having a center portion with an aperture therethrough and further having a side wall. A second cup shaped member includes a center portion with and aperture therethrough and a side wall in slidable engagement with the inner wall of the side wal

The device includes an inverted first cup shaped member having a center portion with an aperture therethrough and further having a side wall. A second cup shaped member includes a center portion with and aperture therethrough and a side wall in slidable engagement with the inner wall of the side wall of the first cup forming a compartment therebetween. An is mounted within the compartment which is made of a shape memory alloy having first and second sides at least partially engaged with the center portions of the first and second cups, respectively; and also having an aperture therethrough aligned with the apertures in the center portions of the first and second cups. At least one heating element is mounted about the insert and a flexible compound encapsulates the at least one heating element. The insert can be made from the memory alloy where a deformation undergone in the martensitic state is definitively cancelled out during the passage to the austenitic state. The insert can also be made of a trained two-way memory alloy where a deformation undergone in the martensitic state is cancelled out during the passage into the austenitic state, but is reassumed during a subsequent passage to the martensitic state. The insert can also be made from a trained two-way memory alloy where additional deformation undergone using a bias force during the austenitic to martensitic state is cancelled out during the passage into the austenitic state, but is reassumed during a subsequent passage to the martensitic state minus the additional induced deformation.

대표청구항 ▼

[ What is claimed is:] [1.] A preload attenuation device comprising:an inverted first cup shaped member having a center portion with an aperture therethrough and further having a side wall;a second cup shaped member having a center portion with an aperture therethrough and a side wall, said side wal

[ What is claimed is:] [1.] A preload attenuation device comprising:an inverted first cup shaped member having a center portion with an aperture therethrough and further having a side wall;a second cup shaped member having a center portion with an aperture therethrough and a side wall, said side wall in slidable engagement with the inner wall of said side wall of said first cup forming a compartment therebetween;an insert mounted within said compartment made of a shape memory metal alloy having a first and second sides at least partially engaged with said center portions of said first and second cups, respectively; said insert having an aperture therethrough, said shape memory metal alloy selected from the group consisting of a one way shape memory alloys that under go a deformation in a martensitic state that is definitively cancelled out during the passage to a austenitic state, or a trained two way shape memory metal alloys where a deformation undergone in the martensitic state is cancelled out during the passage into the austenitic state, but is reassumed during a subsequent passage to the martensitic state, or a trained two way memory alloy where additional deformation undergone using a bias force during the austenitic to martensitic state is cancelled out during the passage into the austenitic state, but is reassumed during a subsequent passage to the martensitic state minus the additional induced deformation; anda heating element mounted within said compartment; anda flexible compound encapsulating said at least one heating element.