Damped crash attenuator
First Claim
1. A crash attenuator which receives an impact force from a moving object and dissipates the impact energy of the object to thereby reduce the velocity of the object and optimally bring the object to rest, comprisinga frame mountable to a truck or stationary structure, a bumper having an impact-receiving face adapted to receive the impact from the object in a crash, a movable displacement structure coupled to said frame and interposed between said frame and said bumper and having a first position in which said bumper is relatively distant from said frame and a second position in which said bumper is relatively proximate to said frame, energy dissipation means coupled to said displacement structure for dissipating the impact energy of the object received by said bumper which causes said displacement structure to be moved from the first position toward the second position and thereby reducing the velocity of the object, and deceleration sensing means coupled to said energy dissipation means for sensing the deceleration of the object after impact with said bumper, said energy dissipation means being arranged to provide an energy dissipation force for dissipating the impact energy of the object based on the sensed deceleration of the object.
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Accused Products
Abstract
A crash attenuator for protecting a truck or stationary structure from damage resulting from impact of an object such as a vehicle including a frame mountable to a truck or stationary structure, a bumper having an impact-receiving face adapted to receive an impact from an object in a crash, a movable displacement structure coupled to the frame and interposed between the frame and the bumper and having a first position in which the bumper is relatively distant from the frame and a second position in which the bumper is relatively proximate to the frame, and an energy dissipation system coupled to the displacement structure for dissipating the impact energy of the object into the bumper which causes said displacement structure to be moved from the first position toward the second position.
75 Citations
48 Claims
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1. A crash attenuator which receives an impact force from a moving object and dissipates the impact energy of the object to thereby reduce the velocity of the object and optimally bring the object to rest, comprising
a frame mountable to a truck or stationary structure, a bumper having an impact-receiving face adapted to receive the impact from the object in a crash, a movable displacement structure coupled to said frame and interposed between said frame and said bumper and having a first position in which said bumper is relatively distant from said frame and a second position in which said bumper is relatively proximate to said frame, energy dissipation means coupled to said displacement structure for dissipating the impact energy of the object received by said bumper which causes said displacement structure to be moved from the first position toward the second position and thereby reducing the velocity of the object, and deceleration sensing means coupled to said energy dissipation means for sensing the deceleration of the object after impact with said bumper, said energy dissipation means being arranged to provide an energy dissipation force for dissipating the impact energy of the object based on the sensed deceleration of the object.
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28. A method for protecting a truck or fixed structure from damage resulting upon impact of a moving object with the truck or structure, comprising the steps of:
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mounting a movable displacement structure to the truck or structure, the displacement structure having an expanded position and a contracted position, arranging a bumper having an impact-receiving face adapted to receive the impact from the moving object on the displacement structure, expanding the displacement structure to its expanded position, detecting impact of the moving object with the bumper which is operative to cause the displacement structure to move from the expanded position toward the contracted position, and dissipating the impact energy of the moving object and reducing the velocity of the moving object by adjusting an energy dissipation force which dissipates the impact energy of the moving object such that the object is optimally brought to rest. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
expanding the displacement structure after the impact energy of the object is dissipated such that the crash attenuator is reusable.
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30. The method of claim 28, further comprising the step of:
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sensing deceleration of the object after impact into the bumper, and adjusting the energy dissipation force based on the sensed deceleration of the object.
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31. The method of claim 28, further comprising the steps of:
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mounting at least one hydraulic mechanism on the displacement structure, the at least one hydraulic actuating mechanism comprising at least one hydraulic cylinder including a housing and a piston movable into and out of the housing, and adjusting the energy dissipation force by controlling the flow of a fluid out of a space between the piston and the housing.
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32. The method of claim 31, wherein the at least one hydraulic cylinder includes a valve having a variable orifice, the flow of the fluid out of the space between the piston and the housing being controlled by varying the size of the orifice.
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33. The method of claim 32, wherein the at least one hydraulic cylinder includes a valve having a variable orifice, further comprising the steps of:
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sensing deceleration of the object after impact into the bumper, varying the size of the orifice based on the sensed deceleration of the object.
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34. The method of claim 28, further comprising the steps of:
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arranging at least one inflatable airbag on the displacement structure, inflating the at least one airbag with fluid, and adjusting the energy dissipation force by regulating the flow of the fluid from the at least one airbag.
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35. The method of claim 34, further comprising the steps of:
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sensing deceleration of the object after impact into the bumper, regulating the flow of the fluid from the at least one airbag based on the sensed deceleration of the object.
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36. The method of claim 28, wherein the step of detecting impact of the object with the bumper comprises the step of sensing impending impact of the object with the bumper prior to actual impact of the object with the bumper and determining information about the object, further comprising the step of:
adjusting the energy dissipation force based on the determined information about the object.
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37. The method of claim 28, wherein the energy dissipation force is adjusted based on the kinetic energy of the object.
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38. The method of claim 28, further comprising the steps of:
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sensing motion of the object after impact into the bumper, and adjusting the energy dissipation force in order to decelerate the object at a substantially constant rate.
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39. A crash attenuator which receives an impact force from a moving object and dissipates the impact energy of the object to thereby reduce the velocity of the object and optimally bring the object to rest, comprising
a frame mountable to a truck or stationary structure, a bumper having an impact-receiving face adapted to receive the impact from the object in a crash, a movable displacement structure coupled to said frame and interposed between said frame and said bumper and having a first position in which said bumper is relatively distant from said frame and a second position in which said bumper is relatively proximate to said frame, energy dissipation means coupled to said displacement structure for dissipating the impact energy of the object received by said bumper which causes said displacement structure to be moved from the first position toward the second position and thereby reducing the velocity of the object, and anticipatory sensing means coupled to said energy dissipation means for sensing impending impact of the object with said bumper prior to actual impact of the object with said bumper and determining information about the object, said energy dissipation means being controlled to provide an energy dissipation force based on the determined information about the object.
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42. A crash attenuator which receives an impact force from a moving object and dissipates the impact energy of the object to thereby reduce the velocity of the object and optimally bring the object to rest, comprising
a frame mountable to a truck or stationary structure, a bumper having an impact-receiving face adapted to receive the impact from the object in a crash, a movable displacement structure coupled to said frame and interposed between said frame and said bumper and having a first position in which said bumper is relatively distant from said frame and a second position in which said bumper is relatively proximate to said frame, energy dissipation means coupled to said displacement structure for dissipating the impact energy of the object received by said bumper which causes said displacement structure to be moved from the first position toward the second position and thereby reducing the velocity of the object, and electronic control means for controlling an energy dissipation force provided by said energy dissipation means.
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43. A crash attenuator which receives an impact force from a moving object and dissipates the impact energy of the object to thereby reduce the velocity of the object and optimally bring the object to rest, comprising
a frame mountable to a truck or stationary structure, a bumper having an impact-receiving face adapted to receive the impact from the object in a crash, a movable displacement structure coupled to said frame and interposed between said frame and said bumper and having a first position in which said bumper is relatively distant from said frame and a second position in which said bumper is relatively proximate to said frame, and energy dissipation means coupled to said displacement structure for dissipating the impact energy of the object received by said bumper which causes said displacement structure to be moved from the first position toward the second position and thereby reducing the velocity of the object, said energy dissipation means comprise a hydraulic mechanism mounted on said displacement structure, said hydraulic mechanism comprising at least one hydraulic cylinder including a housing and a piston movable into and out of said housing, the flow of a fluid out of a space between said piston and said housing being controlled in order to vary the energy dissipation force.
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45. A crash attenuator which receives an impact force from a moving object and dissipates the impact energy of the object to thereby reduce the velocity of the object and optimally bring the object to rest, comprising
a frame mountable to a truck or stationary structure, a bumper having an impact-receiving face adapted to receive the impact from the object in a crash, a movable displacement structure coupled to said frame and interposed between said frame and said bumper and having a first position in which said bumper is relatively distant from said frame and a second position in which said bumper is relatively proximate to said frame, energy dissipation means coupled to said displacement structure for dissipating the impact energy of the object received by said bumper which causes said displacement structure to be moved from the first position toward the second position and thereby reducing the velocity of the object, and means for sensing motion of the object after impact with said bumper and controlling said energy dissipation means to provide a variable energy dissipation force in order to decelerate the object at a substantially constant rate.
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47. A crash attenuator which receives an impact force from a moving object and dissipates the impact energy of the object to thereby reduce the velocity of the object and optimally bring the object to rest, comprising
a frame mountable to a truck or stationary structure, a bumper having an impact-receiving face adapted to receive the impact from the object in a crash, a movable displacement structure coupled to said frame and interposed between said frame and said bumper and having a first position in which said bumper is relatively distant from said frame and a second position in which said bumper is relatively proximate to said frame, energy dissipation means coupled to said displacement structure for dissipating the impact energy of the object received by said bumper which causes said displacement structure to be moved from the first position toward the second position and thereby reducing the velocity of the object, said energy dissipation means being arranged to provide an energy dissipation force for dissipating the impact energy of the object, control means for controlling the energy dissipation force.
Specification