Impact absorber device

Abstract

An impact absorber device includes at least one first portion having a short tubular shape, and at least one second portion having a short tubular shape concentrically disposed in a stacked relationship with the first portion. The first portion and the second portion engage with each other at an engagement portion which is inclined with respect to a concentric axis of the first portion and the second portion. With this arrangement, impact energy is absorbed in the case of collision accidents of vehicles such as an automobile and trains, and the dropping accidents of lifts such as elevators.

1 . An impact absorber device, comprising at least one first portion having a short tubular shape, and at least one second portion having a short tubular shape concentrically disposed in a stacked relationship with said first portion, wherein said first portion and said second portion engage with each other at an engagement portion which is inclined with respect to a concentric axis of said first portion and said second portion,
 wherein the first portion has a small diameter and has a full peripheral sliding contact face at a top portion thereof, the second portion has a large diameter and has a full peripheral sliding contact face at a bottom portion thereof, the engagement portion is a truncated cone connecting the first portion and the second portion so that the full peripheral sliding contact faces are directed in opposite directions,   the first portion, the second portion and the connection portion constitute one unit,   the impact absorber device further comprises support elements for supporting one or a plurality of the unit(s) from both sides, and   the support element has a sliding contact surface on a side facing the unit.   
     
     
         2 . The impact absorber device according to  claim 1 , wherein each of the first portion and the second portion has a short cylindrical shape of which cross-section is a circle, a short tubular shape of which cross-section is an ellipse, or a short tubular shape of which cross-section is a polygon. 
     
     
         3 . The impact absorber device according to  claim 1 , wherein the impact absorber device has a plurality of the units, and adjacent units abut to each other at the full peripheral sliding faces of the first portions. 
     
     
         4 . The impact absorber device according to  claim 1 , wherein the impact absorber device has a plurality of the units, and adjacent units abut to each other at the full peripheral sliding faces of the second portions. 
     
     
         5 . The impact absorber device according to  claim 1 , wherein the impact absorber device further comprises a sliding element which has sliding faces on both sides, the impact absorber device has a plurality of the units, and adjacent units are disposed in such a manner that the full peripheral sliding contact face of the first portion and the full peripheral sliding contact face of the second portion face each other via the sliding element. 
     
     
         6 . The impact absorber device according to  claim 3 , wherein the units are different from each other in shape or in material. 
     
     
         7 . The impact absorber device according to  claim 1 , wherein each of the first portion and the second portion has a short cylindrical shape, and radiuses of the cylindrical shapes of the first portion and the second portion respectively measured on the basis of the center of wall thickness thereof are different from each other. 
     
     
         8 . The impact absorber device according to  claim 7 , wherein the impact absorber device has one or more units, each of which further comprises two of the first portions and one of the second portion disposed therebetween. 
     
     
         9 . The impact absorber device according to  claim 7 , wherein the units are different from each other in shape or in material.