Foldable side rail

Abstract

The object is to provide a side rail that satisfies the dimension specified in the IEC standard, etc. and prevents that the upper crosspiece member of the side rail becomes too high in the stowed state. This invention proposes a foldable side rail in which multiple strut members 2 are pivotally rotatably connected between an upper crosspiece member 1 u and a lower crosspiece member 1 d , to form a parallel link mechanism, while a holding mechanism 5 is provided for holding the abovementioned strut members in an upright position, wherein at least some of the strut members are flat strut members disposed in such a manner that the flat surfaces thereof may face the adjacent strut members, while the number of the strut members per unit length of the side rail is increased.

1 . A foldable side rail in which multiple strut members are pivotally rotatably connected between an upper crosspiece member and a lower crosspiece member, to form a parallel link mechanism, while a holding mechanism is provided for holding the abovementioned strut members in an upright position, wherein at least some of the strut members are flat strut members disposed in such a manner that the flat surfaces thereof may face the adjacent strut members, while the number of the strut members per unit length of the side rail is increased. 
     
     
         2 . A foldable side rail, according to  claim 1 , wherein the strut members are flat strut members except the strut member positioned at the end in the folding direction of the side rail. 
     
     
         3 . A foldable side rail, according to  claim 1 , wherein one out of every predetermined number of strut members is a non-flat strut member. 
     
     
         4 . A foldable side rail, according to  claim 1 , wherein the upper ends of the strut members are shifted in the folding direction of the side rail while the lower ends of the strut members are shifted in the unfolding direction of the side rail.