# US 12,179,536 B2 · Under beam lift assembly for heavy-duty vehicles > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,179,536 B2 - Document ID: US12179536B2 - Status: Granted - Kind: B2 - Application number: 18/376,062 - Filed: 2023-10-03 - Published: 2024-04-11 - Granted: 2024-12-31 - Earliest claimed: 2022-10-05 - Assignees: Hendrickson USA, L.L.C. - Applicants: Hendrickson USA, L.L.C. - Inventors: Gavin M. Rundell; Dominic J. Romito; Jason W. Jones; R. Scott Fulton - Web page: https://patentgrep.com/patent/US12179536B2 ## CPC - B60G 9/003: {the axle being rigidly connected to a trailing guiding device} - B60G 17/0155: {pneumatic unit} - B60G 9/02: the axle or housing being pivotally mounted on the vehicle {, e.g. the pivotal axis being parallel to the longitudinal axis of the vehicle (B60G9/003 takes precedence)} - B60G 2200/31: with two trailing arms rigidly connected to the axle - B60G 2202/412: Pneumatic actuator - B60G 2204/422: Links for mounting suspension elements - B60G 2204/4302: for fixing suspension arm on the vehicle body or chassis - B60G 2204/4702: pneumatically - B60G 2206/601: Hanger bracket - B60G 2300/026: Heavy duty trucks - B60G 2300/402: Extra load carrying wheels, e.g. tag axles - B60G 2500/30: Height or ground clearance - B60G: VEHICLE SUSPENSION ARRANGEMENTS (air-cushion vehicles B60V; {cycle suspensions B62K25/00}) ## Abstract An under beam lift assembly for a heavy-duty vehicle that is removably connectable with an axle/suspension system of the heavy-duty vehicle. The under beam lift assembly includes structure that enables the lift assembly to pivot in an axis different than an axis of a pivotal connection between a suspension assembly and a hanger of the axle/suspension system. The under beam lift assembly is free of contact with the pivotal connection between the suspension assembly and the hanger of the axle/suspension system. ## Claims ### Claim 1 An under beam lift assembly for an axle/suspension system of a heavy-duty vehicle, said under beam lift assembly comprising: a first portion removably connected to said heavy-duty vehicle, said first portion including a pair of side plates; a second portion, said second portion including a pair of side arms, each one of said pair of side arms being pivotally connected to a respective one of said pair of side plates of said first portion, the second portion pivoting in an axis different than an axis of a pivotal connection between a suspension assembly and a hanger of said axle/suspension system; a lift element operatively connected to said second portion, wherein actuation of said lift element causes arcuate upward movement of said suspension assembly via contact with the second portion; and wherein the under beam lift assembly is free of contact with said pivotal connection between said suspension assembly and said hanger. ### Claim 2 (depends on 1) The under beam lift assembly for an axle/suspension system of a heavy-duty vehicle of claim 1, wherein said second portion is free of attachment to said suspension assembly. ### Claim 3 (depends on 1) The under beam lift assembly for an axle/suspension system of a heavy-duty vehicle of claim 1, wherein said first portion is removably connected to said heavy-duty vehicle via fasteners. ### Claim 4 (depends on 1) The under beam lift assembly for an axle/suspension system of a heavy-duty vehicle of claim 1, wherein said first portion is removably connected to said hanger of said axle/suspension system. ### Claim 5 (depends on 4) The under beam lift assembly for an axle/suspension system of a heavy-duty vehicle of claim 4, wherein said hanger reacts a load of said suspension assembly during arcuate upward movement of the suspension assembly via contact with said second portion. ### Claim 6 (depends on 1) The under beam lit assembly for an axle/suspension system of a heavy-duty vehicle of claim 1, wherein said second portion contacts a beam of said suspension assembly during arcuate upward movement of said suspension assembly via contact with the second portion. ### Claim 7 (depends on 1) The under beam lift assembly for an axle/suspension system of a heavy-duty vehicle of claim 1, wherein said lift element is bellows-type air bag formed of an elastomeric material. ### Claim 8 (depends on 1) The under beam lift assembly for an axle/suspension system of a heavy-duty vehicle of claim 1, wherein said first portion is a mounting bracket, said second portion is a lift bracket, and said lift element is a lift chamber operatively connected to said mounting bracket and said lift bracket. ### Claim 9 (depends on 8) The under beam lift assembly for an axle/suspension system of a heavy-duty vehicle of claim 8, said mounting bracket including: a rear plate, a first end of said lift chamber being operatively connected to said rear plate and a second end of the lift chamber being operatively connected to said lift bracket; a bottom wall, said bottom wall being rigidly connected to the rear plate; said pair of side plates, the pair of side plates being rigidly connected to said rear plate and the bottom wall; and wherein at least one of the rear plate and said pair of side plates are removably connected to said heavy-duty vehicle. ### Claim 10 (depends on 9) The under beam lift assembly for an axle/suspension system of a heavy-duty vehicle of claim 9, wherein at least one of said rear plate and said pair of side plates are removably connected to said hanger of said axle/suspension system. ### Claim 11 (depends on 10) The under beam lift assembly for an axle/suspension system of a heavy-duty vehicle of claim 10, wherein each one of said pair of side plates includes a lip with at least one opening, said at least one opening of each of said lips aligning with a respective opening formed in said hanger, a fastener being disposed through each of said at least one openings of the lips and said respective openings formed in the hanger to removably connect said mounting bracket to said hanger. ### Claim 12 (depends on 11) The under beam lift assembly for an axle/suspension system of a heavy-duty vehicle of claim 11, wherein said openings of said hanger are formed in a flange or a cross member support of the hanger. ### Claim 13 (depends on 10) The under beam lift assembly for an axle/suspension system of a heavy-duty vehicle of claim 10, wherein said rear plate includes at least one opening, said at least one opening aligning with a respective opening formed in said hanger, a fastener being disposed through said at least one opening of the rear plate and said respective opening formed in the hanger to removably connect said mounting bracket to said hanger. ### Claim 14 (depends on 9) The under beam lift assembly for an axle/suspension system of a heavy-duty vehicle of claim 9, wherein at least one of said pair of side plates includes an access cutout, said access cutout providing access to said pivotal connection between said suspension assembly and said hanger of said axle/suspension system. ### Claim 15 (depends on 8) The under beam lift assembly for an axle/suspension system of a heavy-duty vehicle of claim 8, said lift bracket including: a lift chamber mounting plate, a first end of said lift chamber being operatively connected to said mounting bracket and a second end of the lift chamber being operatively connected to said lift chamber mounting plate; a rear wall, said rear wall being rigidly connected to the lift chamber mounting plate; said pair of side arms, the pair of side arms being transversely spaced from one another and rigidly connected to the rear wall and said lift chamber mounting plate; a support member, said support member being rigidly connected to the lift chamber mounting plate and said rear wall; and a contact plate, said contact plate being rigidly connected to the rear wall and the support member, the contact plate contacting said suspension assembly during arcuate upward movement of said suspension assembly. ### Claim 16 (depends on 15) The under beam lift assembly for an axle/suspension system of a heavy-duty vehicle of claim 15, wherein said lift bracket further includes a pad attached to a top surface of said contact plate, said pad contacting said suspension assembly during arcuate upward movement of the suspension assembly. ### Claim 17 (depends on 16) The under beam lift assembly for an axle/suspension system of a heavy-duty vehicle of claim 16, wherein said pad is formed of an elastomeric material. ### Claim 18 (depends on 15) The under beam lift assembly for an axle/suspension system of a heavy-duty vehicle of claim 15, wherein each of said pair of side arms includes a boss with a pivot bushing disposed therewithin, said pivot bushings pivotally connecting the pair of side arms to said pair of side plates of said mounting bracket. ### Claim 19 (depends on 1) The under beam lift assembly for an axle/suspension system of a heavy-duty vehicle of claim 1, said under beam lift assembly further including a self-retaining vacuum retention system, said self-retaining vacuum retention system maintaining said under beam lift assembly in a fully retracted state when said lift element is unactuated and said second portion is not in contact with said suspension assembly. ### Claim 20 (depends on 19) The under beam lift assembly for an axle/suspension system of a heavy-duty vehicle of claim 19, said self-retaining vacuum retention system including: a two-way air piloted check valve, said two-way air piloted check valve being in fluid communication with said lift element and an air source located on said heavy-duty vehicle, the two-way piloted check valve including an exhaust port, whereby said two-way air piloted check valve exhausts air from the lift element through said exhaust port and to atmosphere when the two-way air piloted check valve is in an unpiloted state to maintain said under beam lift assembly in said fully retracted state, said two-way air piloted check valve enabling actuation of said lift element and arcuate upward movement of said suspension assembly via contact with said second portion when in a piloted state. ### Claim 21 (depends on 20) The under beam lift assembly for an axle/suspension system of a heavy-duty vehicle of claim 20, said self-retaining vacuum retention system further including a check valve fluidly connected to said exhaust port, said check valve preventing air from flowing from atmosphere, through said two-way air piloted check valve, and to said lift element when the two-way air piloted check valve is in said unpiloted state to maintain said under beam lift assembly in said fully retracted state. ### Claim 22 (depends on 20) The under beam lift assembly for an axle/suspension system of a heavy-duty vehicle of claim 20, said self-retaining vacuum retention system further including a check valve fluidly connected between said air source and said two-way air piloted check valve, said check valve preventing air from flowing from said lift element, through the two-way air piloted check valve, and to the air source when said two-way air piloted check valve is in said piloted state. ### Claim 23 An under beam lift assembly for an axle/suspension system of a heavy-duty vehicle, said under beam lift assembly comprising: a first portion removably connected to a front portion and a rear portion of a hanger of said axle/suspension system; a second portion pivotally connected to said first portion, said second portion pivoting in an axis different than an axis of a pivotal connection between a suspension assembly and said hanger; a lift element operatively connected to the second portion, wherein actuation of said lift element causes arcuate upward movement of said suspension assembly via contact with said second portion; and wherein the under beam lift assembly is free of contact with said pivotal connection between the suspension assembly and the hanger. ### Claim 24 An under beam lift assembly for an axle/suspension system of a heavy-duty vehicle, said under beam lift assembly comprising: a first portion removably connected to said heavy-duty vehicle, said first portion being a mounting bracket, said mounting bracket including: a rear plate, said rear plate including at least one opening, said at least one opening aligning with a respective opening formed in a hanger of said axle/suspension system, a fastener being disposed through the at least one opening of the rear plate and said respective opening formed in said hanger to removably connect the mounting bracket to the hanger; a bottom wall, said bottom wall being rigidly connected to the rear plate; and a pair of side plates, said side pair of side plates being rigidly connected to said rear plate and the bottom wall, wherein at least one of the rear plate and the pair of side plates are removably connected to said heavy-duty vehicle; a second portion pivotally connected to said first portion, said second portion being a lift bracket, the second portion pivoting in an axis different than an axis of a pivotal connection between a suspension assembly and said hanger of said axle/suspension system; a lift element, said lift element being a lift chamber with a first end operatively connected to said rear plate of said mounting bracket and a second end operatively connected to said lift bracket, wherein actuation of the lift element causes arcuate upward movement of said suspension assembly via contact with said second portion; wherein the under beam lift assembly is free of contact with said pivotal connection between the suspension assembly and the hanger; and wherein at least one of said rear plate and said pair of side plates are removably connected to said hanger of the axle/suspension system. ### Claim 25 An under beam lift assembly for an axle/suspension system of a heavy-duty vehicle, said under beam lift assembly comprising: a first portion removably connected to said heavy-duty vehicle, said first portion being a mounting bracket, said mounting bracket including: a rear plate; a bottom wall, said bottom wall being rigidly connected to said rear plate; and a pair of side plates, said pair of side plates being rigidly connected to the rear plate and the bottom wall; a second portion pivotally connected to said first portion, said second portion being a lift bracket, the second portion pivoting in an axis different than an axis of a pivotal connection between a suspension assembly and said hanger of the axle/suspension system; a lift element, said lift element being a lift chamber with a first end operatively connected to said rear plate of said mounting bracket and a second end operatively connected to said lift bracket, wherein actuation of the lift element causes arcuate upward movement of said suspension assembly via contact with the second portion; wherein the under beam lift assembly is free of contact with said pivotal connection between the suspension assembly and the hanger; and wherein at least one of the pair of side plates includes an access cutout, said access cutout providing access to the pivotal connection between said suspension assembly and said hanger of said axle/suspension system. ### Claim 26 An under beam lift assembly for an axle/suspension system of a heavy-duty vehicle, said under beam lift assembly comprising: a first portion removably connected to said heavy-duty vehicle, said first portion being a mounting bracket; a second portion pivotally connected to said first portion, said second portion being a lift bracket, said lift bracket including: a lift chamber mounting plate; a rear wall, said rear wall being rigidly connected to said lift chamber mounting plate; a pair of side arms, said pair of side arms being transversely spaced from one another and rigidly connected to the rear wall and the lift chamber mounting plate, the pair of side arms being pivotally connected to the mounting bracket; a support member, said support member being rigidly connected to said lift chamber mounting plate and said rear wall; and a contact plate, said contact plate being rigidly connected to the rear wall and the support member; the second portion pivoting in an axis different than an axis of a pivotal connection between a suspension assembly and a hanger of said axle/suspension system; a lift element, said lift element being a lift chamber with a first end operatively connected to said mounting bracket and a second end operatively connected to said lift chamber mounting plate, wherein actuation of the lift element causes arcuate upward movement of said suspension assembly via contact with the contact plate of the lift bracket; and wherein the under beam lift assembly is free of contact with said pivotal connection between the suspension assembly and said hanger. ### Claim 27 An under beam lift assembly for an axle/suspension system of a heavy-duty vehicle, said under beam lift assembly comprising: a first portion removably connected to said heavy-duty vehicle; a second portion pivotally connected to said first portion, said second portion pivoting in an axis different than an axis of a pivotal connection between a suspension assembly and a hanger of said axle/suspension system; a lift element operatively connected to the second portion, wherein actuation of said lift element causes arcuate upward movement of said suspension assembly via contact with said second portion; wherein the under beam lift assembly is free of contact with said pivotal connection between the suspension assembly and said hanger; and wherein said under beam lift assembly further includes a self-retaining vacuum retention system, said self-retaining vacuum retention system maintaining the under beam lift assembly in a fully retracted state when the lift element is unactuated and the second portion is not in contact with said suspension assembly.