Energy - absorption system

• US 20030025112A1
• Filed: 09/06/2002
• Published: 02/06/2003
• Est. Priority Date: 11/07/1994
• Status: Active Grant

• Current Assignee: Kothmann Enterprises Incorporated
• Original Assignee: Kothmann Enterprises Incorporated
• Inventors: Pfeifer, Brian G., Sicking, Dean L.
• Granted Patent: US 7,111,827 B2
• Time in Patent Office: Days
• US Class Current: 256/13.1
• CPC Class Codes: E01F 15/143 Protecting devices located at the ends of barriers E01F15/145 takes precedence

Abstract

To reduce the danger of bodily harm to occupants of vehicles that leave a roadway, a guardrail system includes an energy-absorption system is provided. The energy-absorption system including a cutting mechanism positioned to cut a guardrail section upon impact by a vehicle to decelerate the vehicle.

Claims

1. A guardrail terminal adapted to cooperate with a guardrail comprising:

an impact head; and

a cutting section;

said impact head and cutting section being mounted for movement together; and

said cutting section including means for cutting the guardrail when the guardrail terminal and the guardrail are moved with respect to each other.

2. A guardrail terminal in accordance with claim 1 in which the cutting section partly slit the guardrail, whereby more energy is utilized in bending the guardrail as a unit than would be the case if it were completely severed.

3. A guardrail terminal in accordance with claim 1 in which the cutting section severs the guardrail to cause longitudinal separation between portions of the guardrail.

4. A guardrail terminal according to claim 1 in which the cutting section includes a wedge shaped cutter and at least one deflection plate positioned near the wedged shaped cutter to fragment sections of the guardrail.

5. A guardrail terminal according to claim 1 in which the cutting section includes at least one deflection plate means positioned to deflect sections of the guardrail after the guardrail is cut.

6. A guardrail terminal according to claim 1 in which the cutting section includes a plurality of cutters adjacent to each other;

and

each of said cutters being shaped to deflect a cut section of the guardrail in the opposite direction as an adjacent cut section of the guardrail.

7. A guardrail terminal according to claim 7 further including at least one deflection plate.

8. A method of manufacturing a guardrail terminal comprising the steps of:

selecting a predetermined number of cutters; and

positioning the cutters in a cutting section adapted to receive a guardrail;

said step of selecting a predetermined number of cutters including the step of shaping a cutter in accordance with the amount of energy absorbed when the cutter cuts a predetermined rail.

9. A method of manufacturing a guardrail terminal in accordance with claim 8 in which the step of selecting a predetermined number of cutters includes the substep of selecting the number of cutters in accordance with the amount of energy intended to be absorbed upon impact with a vehicle with an expected momentum and desired deceleration.

10. A method of manufacturing a guardrail terminal in accordance with claim 8 further including the step of positioning the cutters in accordance with the amount of energy intended to be absorbed upon impact by vehicles whereby desired deceleration may be obtained by selecting moments of inertia of sections of the guardrail.

11. A method of manufacturing a guardrail terminal in accordance with claim 8 in which the step of selecting a predetermined number of cutters includes the substep of selecting the number of cutters in accordance with the amount of energy intended to be absorbed upon impact with vehicles with an expected momentum and desired deceleration.

12. A method of avoiding bodily damage to an occupant of a vehicle colliding with a guardrail system, comprising the steps of:

causing a guardrail terminal to move with respect to a guardrail and to cut the guardrail when impacted by a vehicle;

causing the guardrail to release a cable holder when impacted by a vehicle; and

causing a vehicle hitting the guardrail to be redirected to a safer direction.

13. A method in accordance with claim 12 further including the steps of:

cutting a fiber reinforced guardrail to form guardrail sections; and

fragmenting the fiber reinforced guardrail sections against a deflecting surface, wherein the sections are sufficiently small to form points of fracture near the deflecting surface.

14. A method of avoiding bodily damage to an occupant of a vehicle colliding with a guardrail system, in accordance with claim 12 further including the step of causing the guardrail terminal to cut and bend the guardrail so as to decelerate the vehicle.

15. A method of avoiding of avoiding bodily damage to an occupant of a vehicle colliding with a guardrail system, in accordance with claim 12 further including the step of causing the guardrail terminal to cut the guardrail into a number of sections and bend the sections of the guardrail so as to decelerate the vehicle.

16. A method of manufacturing a guardrail terminal comprising the steps of:

selecting a predetermined number of cutters; and

positioning the cutters in a cutting section adapted to receive a guardrail;

said step of selecting a predetermined number of cutters including the substep of selecting the number of cutters in accordance with the amount of energy intended to be absorbed upon impact with vehicles with an expected momentum and desired deceleration.

17. A method of manufacturing a guardrail terminal in accordance with claim 16 further including the step of positioning the cutters in accordance with the amount of energy intended to be absorbed upon impact with vehicles with an expected momentum and a desired deceleration by selecting moments of inertia of sections of the guardrail cut by the cutters and bent after being cut.

18. A method of manufacturing a guardrail terminal in accordance with claim 16 in which the step of selecting a predetermined number of cutters includes the substep of selecting the number of cutters in accordance with the amount of energy intended to be absorbed upon impact with vehicles with an expected momentum and desired deceleration.

19. A method of avoiding bodily damage to an occupant of a vehicle colliding with a guardrail system, comprising the steps of:

causing a guardrail terminal to move with respect to a guardrail upon being impacted by a vehicle;

causing the terminal to cut the guardrail as the terminal moves with respect to the guardrail whereby energy is absorbed by the cutting of the guardrail and the movement of the vehicle is decelerated; and

causing the terminal to bend the guardrail as the terminal and guardrail move with respect to each other whereby further energy is absorbed.

20. A method of avoiding bodily damage to an occupant of a vehicle colliding with a guardrail system, in accordance with claim 19 further including the step of causing the guardrail terminal to cut the guardrail into a number of sections and bend the sections of the guardrail so as to decelerate the vehicle.

21. An energy-absorption system for positioning along a roadway to absorb the energy of an errant vehicle, the energy-absorption system comprising:

an impact head;

a cutter; and

a cuttable member;

wherein the impact head is positionable along a roadway to cooperate with the upstream portion of a roadside hazard; and

wherein the impact head is in operational connection with the cutter and the cuttable member such that the impact of an errant vehicle with the impact head will cause the cutter to cut at least a portion of the cuttable member to absorb the impact energy of the errant vehicle.

22. The energy-absorption system of claim 21 further including:

a deflector positioned to bend at least a portion of the cuttable member away from the path of the errant vehicle.

23. The energy-absorption system of claim 21 wherein the cuttable member is a structural pipe.