Patent ID: 6637789
Filing Date: 2003-10-28
Classification: B60R

Abstract:
A system for absorbing force and energy associated with a collision of a land vehicle comprising:a) a first stage force and energy absorbing system which includes (1) two bumpers on a land vehicle, each of the bumpers including a first wall and a second wall spaced apart from the first wall in a length direction of a land vehicle on which the two bumpers are mounted and a gap defined between the first wall and the second wall, each of the bumpers extending across a width dimension of the land vehicle on which they are mounted and having a first end located on one side of the land vehicle and a second end located on another side of the land vehicle, each of the bumpers having a length dimension extending between the first end of the bumper and the second end of the bumper, (2) a plurality of joints in the first wall of each of the bumpers, each joint including (A) a hinge in the first wall of the bumper, (B) a first compression spring located adjacent to the hinge and fixed to the first wall at one end of the first spring and fixed to the second wall at a second end of the spring, and (C) a second compression spring located adjacent to the hinge and fixed to the first wall at one end of the second spring and fixed to the second wall at a second end of the spring, the hinge being interposed between the first spring and the second spring, (3) the plurality of joints being spaced apart from each other in the direction of the length dimension of the bumper, and (4) one joint being located adjacent to the first end of each bumper and a second joint being located adjacent to the second end of each bumper, and (5) a plurality of energy absorbers on each bumper, the energy absorbers being spaced apart from each other in the direction of the length dimension of each bumper, with one energy absorber being located adjacent to the first end of each bumper and a second energy absorber being located adjacent to the second end of each bumper, each energy absorber including (A) a hole defined through the second wall of the bumper associated therewith, (B) a first pivot pin located adjacent to the hole and having one end fixed to the second wall of the bumper associated therewith adjacent to the hole and a second end located in the gap defined between the first wall of the bumper associated therewith and the second wall of the bumper associated therewith, (C) a second pivot pin located adjacent to the hole and having one end fixed to the second wall of the bumper associated therewith adjacent to the hole and a second end located in the gap defined between the first wall of the bumper associated therewith and the second wall of the bumper associated therewith, (D) the hole being interposed between the first pivot pin and the second pivot pin, (E) a cylindrical rod extending through the hole and having a first end located adjacent to the first wall of the bumper associated therewith and a second end located adjacent to the second wall of the bumper associated therewith, the rod including (i) a length dimension extending between the first end of the rod and the second end of the rod, (ii) a blind-ended bore defined along the length dimension of the rod from the second end of the rod towards the first end of the rod, (iii) a first triangular foot on the second end of the rod, the first triangular foot including a base on the rod, an apex spaced apart from the rod, a leg connecting the base of the first triangular foot to the apex of the first triangular foot, the leg of the first triangular foot extending radially outward from the rod, and a hypotenuse connecting the base of the first triangular foot and the apex of the first triangular foot, the leg of the first triangular foot being interposed between the hypotenuse of the first triangular foot and the second wall of the bumper associated therewith, (iv) a second triangular foot on the second end of the rod, the second triangular foot including a base on the rod, an apex spaced apart from the rod, a leg connecting the base of the second triangular foot to the apex of the second triangular foot, the leg of the second triangular foot extending radially outward from the rod and being diametrically opposed to the leg of the first triangular foot, and a hypotenuse connecting the base of the second triangular foot and the apex of the second triangular foot, the leg of the second triangular foot being interposed between the hypotenuse of the second triangular foot and the second wall of the bumper associated therewith and (v) a lever arm interposed between the first triangular foot and the second triangular foot and including a head in contact with the base of the first triangular foot and also in contact with the base of the second triangular foot and a body extending from the head of the lever arm in the direction of the length dimension of the rod, (F) a head on the rod, the head being fixed to the rod for movement therewith and the head being located adjacent to the first wall of the bumper associated therewith, (G) a conical housing having a skirt section and an apex section, the apex section including a hollow cylindrical portion, the hollow cylindrical portion being fixed to the rod to move therewith, (H) the skirt section of the conical housing contacting the second end of the first pivot pin and contacting the second end of the second pivot pin, (I) a first compression spring connecting a first end of the skirt section of the conical housing to the second wall of the bumper associated therewith, (J) a second compression spring connecting the first end of the skirt section of the conical housing to the second wall of the bumper associated therewith, the second compression spring being spaced apart from the first compression spring, (K) a first ratchet rack mounted on the second wall of a bumper associated therewith adjacent to the hole defined through the second wall of the bumper associated therewith and extending in the direction of the length dimension of the rod extending through the hole in the bumper associated therewith and extending away from the second wall of the bumper associated therewith and away from the gap defined between the first wall of the bumper associated therewith and the second wall of the bumper associated therewith, the first ratchet rack including a body having a first end mounted on the second wall of the bumper associated therewith and a second end spaced apart from the first end of the ratchet rack, plurality of triangular teeth which are spaced apart from each other in the direction of the length dimension of the rod extending through the hole in the second wall of the bumper associated therewith, each triangular tooth of the plurality of triangular teeth including a base on the body of the first ratchet rack, an apex spaced apart from the body of the first ratchet rack, a leg extending from the base of the triangular tooth to the apex of the triangular tooth and a hypotenuse extending from the apex of the triangular tooth to the base of the triangular tooth, the hypotenuse being interposed between the leg of the triangular tooth and the second wall of the bumper associated therewith, (L) a second ratchet rack mounted on the second wall of a bumper associated therewith adjacent to the hole defined through the second wall of the bumper associated therewith and extending in the direction of the length dimension of the rod extending through the hole in the bumper associated therewith and extending away from the second wall of the bumper associated therewith and away from the gap defined between the first wall of the bumper associated therewith and the second wall of the bumper associated therewith, the second ratchet rack being spaced apart from the first ratchet rack with the hole being interposed between the first ratchet rack and the second ratchet rack, the second ratchet rack including a body having a first end mounted on the second wall of the bumper associated therewith and a second end spaced apart from the first end of the second ratchet rack, plurality of triangular teeth which are spaced apart from each other in the direction of the length dimension of the rod extending through the hole in the second wall of the bumper associated therewith, each triangular tooth of the plurality of triangular teeth of the second ratchet rack including a base on the body of the second ratchet rack, an apex spaced apart from the body of the second ratchet rack, a leg extending from the base of the triangular tooth of the second ratchet rack to the apex of the triangular tooth of the second ratchet rack and a hypotenuse extending from the apex of the triangular tooth of the second ratchet rack to the base of the triangular tooth of the second ratchet rack, the hypotenuse of the tooth on the second ratchet rack being interposed between the leg of the triangular tooth of the second ratchet rack and the second wall of the bumper associated therewith, (M) the rod being movable between a first position with the first wall of the bumper associated therewith being located at a first distance from the second wall of the bumper associated therewith and a second position with the first wall of the bumper associated therewith being located a second distance from the second wall of the bumper associated therewith, with the second distance being smaller than the first distance, (N) the hypotenuse of one of the triangular feet on the shaft engaging the hypotenuse of at least one of the triangular teeth of the first ratchet rack during the movement of the rod from the first position to the second position and the leg of at least one tooth of the triangular teeth on the rod engaging the leg of at least one of the first triangular teeth of the ratchet racks when the rod moves from the second position toward the first position, (O) the leg of the first triangular foot and the leg of the triangular tooth of the first ratchet rack both extending in a radial direction with respect to the rod, (P) the leg of the second triangular foot and the leg of the triangular tooth of the second ratchet rack both extending in a radial direction with respect to the rod, and (Q) a compression spring surrounding the rod and having one thereof end seated on the head of the rod and another end thereof seated on the skirt section of the conical section adjacent to the cylindrical portion of the apex section; and b) a second stage force and energy absorbing system which includes (1) a plurality of shafts, with each shaft fixed at a first end thereof to the second wall of one of the two bumpers, each shaft extending in the length direction of the land vehicle and having a second end spaced apart from the first end of each shaft, each shaft having an outer dimension and a longitudinal dimension, and each shaft being spaced apart from adjacent shafts, the second end of each shaft being spaced apart from the second ends of adjacent shafts, the shafts being arranged in pairs, with two shafts of each pair being oriented to extend closely adjacent to each other with the longitudinal dimensions of the shafts in each pair being spaced apart from each other in the width dimension of the land vehicle, and with the pairs of shafts being spaced apart from each other along the width dimension of the land vehicle, (2) a plurality of mounting brackets on each shaft, the mounting brackets on each shaft being spaced apart from each other along the longitudinal dimension of the shaft on which the mounting brackets are mounted, one mounting bracket on each shaft being fixedly secured to the shaft, (3) a first vehicle mounting bracket fixedly mounted on the land vehicle and slidably accommodating both shafts of a first pair of shafts, and a plurality of additional mounting brackets on each shaft which are slidably mounted on each shaft, (4) a second vehicle mounting bracket fixedly mounted on the land vehicle and slidably accommodating both shafts of a second pair of shafts, (5) a plurality of second stage compression spring units associated with each shaft which includes (A) a first set of second stage compression springs on a first shaft, each second stage compression spring of the first set of second stage compression springs being located between each mounting bracket on the first shaft and an adjacent mounting bracket on the first shaft, the second stage compression springs on the first shaft being oriented to extend along the length dimension of the land vehicle and to have one end mounted on one mounting bracket and another end mounted on an adjacent mounting bracket on the first shaft, (B) a first set of hydraulic spring units mounted with respect to the first shaft, each hydraulic spring unit of the first set of hydraulic spring units being mounted between each mounting bracket on the first shaft and located adjacent to each second stage compression spring on the first shaft, each hydraulic spring unit of the first set of hydraulic spring units including (i) a cylinder mounted on one mounting bracket on the first shaft, (ii) a fluid in the cylinder of the hydraulic spring of the first set of hydraulic spring units, (iii) a seal slidably mounted in the cylinder of the hydraulic spring of the first set of hydraulic spring units, the seal having two one-way valves, and (iv) a ram having a first end thereof connected to the seal of the hydraulic spring unit of the first set of hydraulic spring units for movement therewith and a second end fixed to a mounting bracket on the first shaft and which is associated therewith, (C) the hydraulic springs of the first set of hydraulic springs being oriented parallel to the second stage compression springs of the first set of second stage compression springs to operate in parallel therewith, (D) a second set of second stage compression springs on a second shaft, each second stage compression spring of the second set of second stage compression springs being located between each mounting bracket on a second shaft and an adjacent mounting bracket on the second shaft, the second stage compression springs on the second shaft being oriented to extend along the length dimension of the land vehicle and to have one end mounted on one mounting bracket and another end mounted on an adjacent mounting bracket on the second shaft, (E) a second set of hydraulic spring units mounted with respect to the second shaft, each hydraulic spring unit of the second set of hydraulic spring units being mounted between each mounting bracket on the second shaft and located adjacent to each second stage compression spring on the second shaft, each hydraulic spring unit of the second set of hydraulic spring units including (i) a cylinder mounted on one mounting bracket on the second shaft, (ii) a fluid in the cylinder of the hydraulic spring of the second set of hydraulic spring units, (iii) a seal slidably mounted in the cylinder of the hydraulic spring of the second set of hydraulic spring units, the seal having two one-way valves, and (iv) a ram having a first end thereof connected to the seal of the hydraulic spring unit of the second set of hydraulic spring units for movement therewith and a second end fixed to a mounting bracket on the second shaft and which is associated therewith, (F) the hydraulic springs of the second set of hydraulic springs being oriented parallel to the second stage compression springs of the second set of second stage compression springs to operate in parallel therewith, (G) a third set of third stage compression springs on a third shaft, each third stage compression spring of the third set of third stage compression springs being located between each mounting bracket on a third shaft and an adjacent mounting bracket on the third shaft, the third stage compression springs on the third shaft being oriented to extend along the length dimension of the land vehicle and to have one end mounted on one mounting bracket and another end mounted on an adjacent mounting bracket on the third shaft, (H) a third set of hydraulic spring units mounted with respect to the third shaft, each hydraulic spring unit of the third set of hydraulic spring units being mounted between a mounting bracket on the third shaft and an adjacent mounting bracket on the third shaft and being located adjacent to each second stage compression spring on the third shaft, each hydraulic spring unit of the third set of hydraulic spring units including (i) a cylinder mounted on one mounting bracket on the third shaft, (ii) a fluid in the cylinder of the hydraulic spring of the third set of hydraulic spring units, (iii) a seal slidably mounted in the cylinder of the hydraulic spring of the third set of hydraulic spring units, the seal having two one-way valves, and (iv) a ram having a first end thereof connected to the seal of the hydraulic spring unit of the third set of hydraulic spring units for movement therewith and a second end fixed to a mounting bracket on the third shaft and which is associated therewith, (I) the hydraulic springs of the third set of hydraulic springs being oriented parallel to the second stage compression springs of the third set of second stage compression springs to operate in parallel therewith, (J) a fourth set of second stage compression springs on a fourth shaft, each second stage compression spring of the fourth set of second stage compression springs being located between a mounting bracket on a fourth shaft and an adjacent mounting bracket on the fourth shaft, the second stage compression springs on the fourth shaft being oriented to extend along the length dimension of the land vehicle and to have one end mounted on one mounting bracket and another end mounted on an adjacent mounting bracket on the fourth shaft, (K) a fourth set of hydraulic spring units mounted with respect to the fourth shaft, each hydraulic spring unit of the fourth set of hydraulic spring units being mounted between a mounting bracket on the fourth shaft and an adjacent mounting bracket on the fourth shaft and being located adjacent to each second stage compression spring on the fourth shaft, each hydraulic spring unit of the fourth set of hydraulic spring units including (i) a cylinder mounted on one mounting bracket on the fourth shaft, (ii) a fluid in the cylinder of the hydraulic spring of the fourth set of hydraulic spring units, (iii) a seal slidably mounted in the cylinder of the hydraulic spring of the fourth set of hydraulic spring units, the seal having two one-way valves, and (iv) a ram having a first end thereof connected to the seal of the hydraulic spring unit of the fourth set of hydraulic spring units for movement therewith and a second end fixed to a mounting bracket on the fourth shaft and which is associated therewith, and (L) the hydraulic springs of the fourth set of hydraulic springs being oriented parallel to the second stage compression springs of the fourth set of second stage compression springs to operate in parallel therewith, (6) a second end of the first shaft being slidably accommodated in the first vehicle mounting bracket which accommodates the first and second shafts and being in abutting contact with a cylinder of the second set of hydraulic spring units and which is mounted on the first vehicle mounting bracket, the first shaft being aligned with the ram of a cylinder of the second set of hydraulic springs which is mounted of the first vehicle mounting bracket and the second shaft being aligned with the ram of a cylinder of the first set of hydraulic cylinders mounted on the first vehicle mounting bracket, the second shaft being slidably accommodated in the first vehicle mounting bracket, and (7) a second end of the third shaft being slidably accommodated in the second vehicle mounting bracket and being in abutting contact with a cylinder of the fourth set of hydraulic springs mounted on the second vehicle mounting bracket, the third shaft being aligned with the ram of a cylinder of the fourth set of hydraulic springs which is mounted on the second vehicle mounting bracket and the fourth shaft being aligned with the ram of the cylinder of the third set of hydraulic cylinders mounted on the second vehicle mounting bracket, the fourth shaft being slidably accommodated in the second vehicle mounting bracket.