Energy absorbing post having sliding rail assembly

An energy absorbing post, comprising a base member having a sliding rail assembly embedded therein, a post body installed to the base member, and a base plate provided to a lower end of the post body,

• wherein the sliding rail assembly includes a pair of sliding support members disposed horizontally with a lateral interval and the base plate placed on an upper surface thereof for sliding on the pair of sliding support members, and a pair of vertical support members disposed vertically to support the sliding support members, respectively, to form a guide trough,
• wherein a compressive deforming pipe elongated in a longitudinal direction and having a sectional diameter gradually increasing rearward is disposed in the guide trough, the compressive deforming pipe having an outer circumference that is compressively deformed to dissipate collision energy caused by a vehicle collision,
• wherein a pressing member surrounding the outer circumference of the compressive deforming pipe is provided to a lower surface of the base plate,
• wherein in a state where the post body is coupled to the sliding rail assembly to stand up such that the base plate is placed on the upper surface of the sliding support member and the pressing member is disposed at the guide trough to surround the outer circumference of the compressive deforming pipe, when a vehicle collides with the post body, the pressing member moves rearward along with a rearward movement of the post body to press and deform the outer circumference of the compressive deforming pipe, so that the collision energy is absorbed and dissipated by the compressive deformation of the compressive deforming pipe to decelerate and stop the vehicle,
• wherein the compressive deforming pipe is divided into regions, comprising a spaced distance forming region having a small diameter, a diameter changing region changing from the small diameter to a large diameter and a compressive deforming region having the large diameter, from the front to the rear in the longitudinal direction,
• wherein the compressive deforming pipe is disposed to be spaced apart from a bottom of the guide trough without moving in the longitudinal direction,
• wherein the pressing member includes an outer frame member having a perforated portion formed at a center thereof so that the compressive deforming pipe is interposed therein,
• wherein a close pressing member directly contacting the outer circumference of the compressive deforming pipe to compressively deform the compressive deforming pipe is formed at an inner surface of the perforated portion of the outer frame member,
• wherein the close pressing member includes a plurality of convex portions made of a semicircular pillar-shaped member to have a curvature and formed at the inner surface of the perforated portion of the outer frame member to be oriented toward a center of the perforated portion,
• wherein the spaced distance forming region of the compressive deforming pipe is divided into a front fixing end coupled to a fixing part and a continuous portion detachably assembled to the front fixing end,
• wherein the fixing part is fixed to the sliding rail assembly or to the ground deviated from a front portion of the sliding rail assembly to prevent the compressive deforming pipe from moving in the longitudinal direction, and
• wherein the front fixing end of the compressive deforming pipe is coupled to the fixing part so that the compressive deforming pipe is disposed at the guide trough in the form of a cantilever.