# US 5,346,246 A · Automatic air bag suspension control system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,346,246 A - Document ID: US5346246A - Status: Granted - Kind: A - Application number: 07/980,507 - Filed: 1992-11-23 - Granted: 1994-09-13 - Earliest claimed: 1992-11-23 - Assignees: Load-Air, Inc. - Inventors: Cecil Lander; Alex Khaykin - Web page: https://patentgrep.com/patent/US5346246A ## CPC - B60G 17/0485: {the springs being pneumatic springs with a flexible wall, e.g. with levelling valves} - B60G 11/28: characterised by means specially adapted for attaching the spring to axle or sprung part of the vehicle - B60G 11/465: {with a flexible wall} - B60G 17/052: Pneumatic spring characteristics (B60G17/048 takes precedence {; valves per se F16K}) - B60G: VEHICLE SUSPENSION ARRANGEMENTS (air-cushion vehicles B60V; {cycle suspensions B62K25/00}) ## Abstract A vehicle energy absorbing system for a vehicle having a suspension system, a frame and an axle, wherein the frame is spaced apart from the axle in a vertical direction and the suspension system mechanically couples the frame to the axle. The system includes an expandable air bag mechanically coupled to the frame and to the axle, a distance indicator for indicating a vertical distance between the frame and the axle attached to the vehicle, an air bag pressure control valve fluidly connected to the air bag and coupled to the distance indicator, and a source of air under pressure attached to the vehicle and fluidly coupled to the air bag pressure control valve through a control panel. When the indicator indicates a first distance between the frame and the axle, the valve is positioned in a first position supplying air from the source of air to the air bag at a first air pressure, and when the indicator indicates a second distance between the frame and the axle, the valve is positioned in a second position supplying air from the source of air to the air bag at a second air pressure. ## Claims ### Claim 1 A vehicle energy absorbing system for a vehicle having a suspension system, a frame and an axle, wherein the frame is spaced apart from the axle in a vertical direction and the suspension system mechanically couples the frame to the axle, said vehicle energy absorbing system comprising: an expandable air bag mechanically coupled to the frame and the axle; a distance indicator for indicating a vertical distance between the frame and the axle attached to the vehicle; an air bag pressure control valve in fluid communication with said air bag and operable with said distance indicator; and a source of air under pressure attached to the vehicle and in fluid communication with said air bag pressure control valve, whereby when said distance indicator indicates a first vertical distance between the frame and the axle, said valve is positioned in a first position supplying air from said source of air to said air bag at a first air pressure and when said distance indicator indicates a second vertical distance between the frame and the axle, said valve is positioned in a second position supplying air from said source of air to said air bag at a second air pressure and whereby said air bag insignificantly affects the distance between the frame and the axle while significantly affecting the smoothness of the ride of the vehicle. ### Claim 2 (depends on 1) The vehicle energy absorbing system as claimed in claim 1 wherein said air bag pressure control valve is a pilot valve mechanically and operatively connected to said distance indicator. ### Claim 3 (depends on 1) The vehicle energy absorbing system as claimed in claim 1 wherein said distance indicator includes a spring operable between the frame and the axle. ### Claim 4 (depends on 1) The vehicle energy absorbing system as claimed in claim 1 wherein said distance indicator includes a base; a guiding member attached to said base; a guided member having a leg member and a top member, said leg slideably received by said guiding member, and a spring sandwiched between said base and said top member of said guided member so that said guided member is adapted to move in the vertical direction relative to said base. ### Claim 5 (depends on 1) The vehicle energy absorbing system of claim 1 including a control panel connected to the vehicle, said control panel including a pre-set high pressure regulator and a pre-set low pressure regulator, each of said regulators adapted to control said control valve under predetermined conditions. ### Claim 6 A kit for modifying a vehicle having a suspension system, the vehicle having a frame and an axle, and a source of air pressure, wherein the frame is spaced apart from the axle arrangement in vertical direction, the suspension system mechanically coupling the frame to the axle arrangement, said kit comprising: an expandable air bag adapted to be coupled to the frame and to the axle and to the source of air pressure; a distance indicator for indicating a vertical distance between the frame and the axle adapted to be attached to the vehicle; and an air bag pressure control valve adapted to be in fluid communication with said air bag and coupled to said distance indicator, whereby when said distance indicator indicates a first distance between the frame and the axle, said valve is adapted to be positioned in a first position to supply air from said source of air to said air bag at a first air pressure and when said distance indicator indicates a second distance between the frame and the axle, said valve is adapted to be positioned in a second position and to supply air from said source of air to said air bag at a second air pressure and whereby said air bag is adapted to insignificantly affect the distance between the frame and the axle while significantly affecting the smoothness of the ride of the vehicle. ### Claim 7 (depends on 6) The kit as claimed in claim 6 wherein said distance indicator includes a base, a guiding member attached to said base, a guided member having a leg member and a top member, said leg adapted to be slideably received by said guiding member, and a spring adapted to be sandwiched between said base and said top member of said guided member, and said air bag pressure control valve is a pilot valve having a wheel mounted to an arm, said wheel adapted to rest on said top member of the guiding member. ### Claim 8 A vehicle energy absorbing system for a vehicle having a suspension system, a frame and an axle, wherein the frame is spaced apart from the axle in a vertical direction and the suspension system mechanically couples the frame to the axle, said vehicle energy absorbing system comprising: an expandable air bag mechanically coupled to the frame and the axle; a distance indicator for indicating a vertical distance between the frame and the axle attached to the vehicle wherein said distance indicator comprises a base, a guiding member attached to said base, a guided member having a leg member and a top member, said leg slideably received by said guiding member, and a spring sandwiched between said base and said top member of said guided member so that said guided member is adapted to move in the vertical direction relative to said base; an air bag pressure control valve in fluid communication with said air bag and operable with said distance indicator; and a source of air under pressure attached to the vehicle and in fluid communication with said air bag pressure control valve, wherein when said distance indicator indicates a first vertical distance between the frame and the axle, said valve is positioned in a first position supplying air from said source of air to said air bag at a first air pressure and when said distance indicator indicates a second vertical distance between the frame and the axle, said valve is positioned in a second position supplying air from said source of air to said air bag at a second air pressure. ### Claim 9 (depends on 8) The vehicle energy absorbing system of claim 8 wherein said guiding member includes at least a first set of two rollers attached to said base, said rollers spaced a horizontal distance apart wherein said guided member leg is slideably received by said guiding member between said rollers. ### Claim 10 (depends on 9) The vehicle energy absorbing system of claim 9 wherein said guiding member includes a second set of rollers also having two rollers attached to said base, said rollers in said second set spaced a second horizontal distance apart, wherein said guided member further includes a second leg depending from said top member and is U-shaped, said second leg slideably received by said guiding member between said rollers of said second set. ### Claim 11 (depends on 8) The vehicle energy absorbing system of claim 8 further comprising a stop member attached to said guided member. ### Claim 12 (depends on 11) The vehicle energy absorbing system of claim 11 wherein said stop member is attached to said leg, said stop member includes a block having a hole and a screw having a head, said screw is received by said block hole, said leg has an adjusting hole through which said screw passes and said leg is sandwiched between said block and said screw head. ### Claim 13 (depends on 12) The vehicle energy absorbing system of claim 12 wherein said leg has a plurality of adjusting holes in the vertical direction adapted to receive said stop and adjust the maximum distance of said top member with respect to said base. ### Claim 14 (depends on 8) The vehicle energy absorbing system of claim 8 wherein said spring is attached to said base and said top member. ### Claim 15 (depends on 8) The vehicle energy absorbing system as claimed in claim 8 wherein said air bag pressure control valve is a pilot valve mechanically and operatively connected to said distance indicator. ### Claim 16 (depends on 15) The vehicle energy absorbing system as claimed in claim 15 wherein said pilot valve rests on said top member of said guided member. ### Claim 17 (depends on 16) The vehicle energy absorbing system as claimed in claim 16 wherein said pilot valve includes a wheel mounted to an arm, said wheel resting on said top member of the guided member. ### Claim 18 (depends on 17) The vehicle energy absorbing system of claim 17 wherein said pilot valve is a two-position pilot valve and said pilot valve further includes a high pressure inlet port, a low pressure inlet port, an outlet port fluidly coupled to said air bag and a spring actuated valve member attached to said arm whereby when said top member is greater than or equal to a first distance from said base, said spring actuated valve member is in a first position fluidly coupling said low pressure inlet port to said outlet port and blocking said high pressure inlet port from said outlet port and when said top member is less than a second distance from said base, said spring actuated valve member is in a second position fluidly coupling said high pressure inlet port to said outlet port and blocking said low pressure inlet port from said outlet port. ### Claim 19 (depends on 18) The vehicle energy absorbing system of claim 18 further comprising a pressure regulator having an inlet port in fluid communication with said air source, a high pressure exit port in fluid communication with said pilot valve high pressure inlet port and a low pressure exit port in fluid communication with said pilot valve low pressure inlet port. ### Claim 20 A kit for modifying a vehicle having a suspension system, the vehicle having a frame and an axle, and a source of air pressure, wherein the frame is spaced apart from the axle arrangement in a vertical direction, the suspension system mechanically coupling the frame to the axle arrangement, said kit comprising: an expandable air bag adapted to be coupled to the frame and to the axle and to the source of air pressure; a distance indicator for indicating a vertical distance between the frame and the axle adapted to be attached to the vehicle wherein said distance indicator includes a base, a guiding member attached to said base, a guided member having a leg member and a top member, said leg adapted to be slideably received by said guiding member, and a spring adapted to be sandwiched between said base and said top member of said guided member so that said guided member is adapted to move in the vertical direction relative to said base; and an air bag pressure control valve adapted to be in fluid communication with said air bag and coupled to said distance indicator, whereby when said distance indicator indicates a first distance between the frame and the axle, said valve is adapted to be positioned in a first position to supply air from said source of air to said air bag at a first air pressure and when said distance indicator indicates a second distance between the frame and the axle, said valve is adapted to be positioned in a second position and to supply air from said source of air to said air bag at a second air pressure. ### Claim 21 (depends on 20) A kit as claimed in claim 20 wherein said air bag pressure control valve is a pilot valve having a wheel mounted to an arm, said wheel adapted to rest on said top member of the guided member. ### Claim 22 A vehicle energy absorbing system for a vehicle having a suspension system, a frame and an axle, wherein the frame is spaced apart from the axle in a vertical direction and the suspension system mechanically couples the frame to the axle, said vehicle energy absorbing system comprising: an expandable air bag mechanically coupled to the frame and the axle; a distance indicator for indicating a vertical distance between the frame and the axle attached to the vehicle; an air bag pressure control valve in fluid communication with said air bag and operable with said distance indicator; and a source of air under pressure attached to the vehicle and in fluid communication with said air bag pressure control valve, wherein when said distance indicator indicates a first vertical distance between the frame and the axle, said valve is positioned in a first position supplying air from said source of air to said air bag at a first air pressure and inflating said air bag to the first air pressure and when said distance indicator indicates a second vertical distance between the frame and the axle, said valve is positioned in a second position supplying air from said source of air to said air bag at a second air pressure and inflating said air bag to the second air pressure.