# US 11,999,602 B2 · Boom assembly with translatable counterbalance mass > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,999,602 B2 - Document ID: US11999602B2 - Status: Granted - Kind: B2 - Application number: 16/837,572 - Filed: 2020-04-01 - Published: 2021-10-07 - Granted: 2024-06-04 - Earliest claimed: 2020-04-01 - Assignees: Terex South Dakota, Inc. - Applicants: Terex South Dakota, Inc. - Inventors: James A. Donaldson - Web page: https://patentgrep.com/patent/US11999602B2 ## CPC - B66F 11/044: {Working platforms suspended from booms} - B66F 11/046: {of the telescoping type} - B66F 13/00: Common constructional features or accessories - B66C 23/64: Jibs - B66C 23/72: Counterweights or supports for balancing lifting couples - B66F: HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD ({invalid lifting devices A61G7/10; } mounting artificial islands on piles or like supports E02B17/00; scaffolding combined with lifting devices E04G1/22; lifting devices for sliding forms E04G11/24; lifting of buildings E04G23/06; shores or struts E04G25/00; lifts or other hoisting devices on ladders E06C7/12; props for mining E21D15/00) - B66C: CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES ({specially adapted for lifting invalids A61G7/10;} rope, cable, or chain winding mechanisms, braking or detent devices therefor B66D; specially adapted for nuclear reactors G21) ## Abstract A boom assembly according to the disclosure may include a lower boom structure, and an upper boom structure that is connected to the lower boom structure. In addition, the boom assembly may include a counterweight movably mounted on one of the boom structures and movable along the one boom structure when at least a portion of the lower boom structure is moved relative to the upper boom structure or when at least a portion of the upper boom structure is moved relative to the lower boom structure. ## Claims ### Claim 1 A boom assembly comprising: a base; a support member connected to the base; a lower boom structure connected to the base so that the lower boom structure is pivotable with respect to the base between a lowered position of the lower boom structure and a raised position of the lower boom structure; an upper boom structure having a first end connected to the lower boom structure, and an opposite second end, wherein the upper boom structure is pivotable with respect to the lower boom structure between a lowered position of the upper boom structure and a raised position of the upper boom structure in which the second end is positioned above the lower boom structure; a counterweight movably mounted on the lower boom structure and movable along the lower boom structure when at least a portion of the lower boom structure is moved relative to the base; and a link having a first end pivotably connected to the counterweight and a second end pivotally connected directly to the support member. ### Claim 2 (depends on 1) The boom assembly of claim 1 wherein the counterweight is slidably mounted on the lower boom structure. ### Claim 3 (depends on 1) The boom assembly of claim 1 wherein the link is configured to move the counterweight downwardly along the lower boom structure when the lower boom structure is moved from the lowered position of the lower boom structure to the raised position of the lower boom structure. ### Claim 4 (depends on 1) The boom assembly of claim 1 wherein the link comprises a cylinder connected to the counterweight for translating the counterweight along the lower boom structure. ### Claim 5 (depends on 1) The boom assembly of claim 1 wherein the lower boom structure includes an elongated guide member, and the counterweight includes one or more guide elements that are engageable with the elongated guide member. ### Claim 6 (depends on 1) The boom assembly of claim 1 further comprising a connecting element for connecting the link to the counterweight, and a first bearing element and a second bearing element positioned at opposite ends of the connecting element for slidably engaging the lower boom structure. ### Claim 7 (depends on 6) The boom assembly of claim 6 wherein the lower boom structure comprises two elongated guide members disposed on opposite sides of the counterweight, and the counterweight includes a first bearing element and a second bearing element that are each engageable with a first side of a respective elongated guide member, wherein the first and second bearing elements positioned at opposite ends of the connecting element are each located adjacent to a second side of a respective elongated guide member that is opposite the first side of the elongated guide member. ### Claim 8 (depends on 1) The boom assembly of claim 1 wherein the counterweight is translatable along the lower boom structure when the lower boom structure is pivoted with respect to the base. ### Claim 9 (depends on 1) The boom assembly of claim 1 wherein the counterweight is translatable along the lower boom structure when a section of the lower boom structure is moved between a retracted position and an extended position. ### Claim 10 (depends on 1) The boom assembly of claim 1 wherein the support member is rotatably mounted on the base, the lower boom structure has a first end pivotally connected to the support member, and a second end pivotally connected to the first end of the upper boom structure, and wherein the counterweight is movable along the lower boom structure between the first and second ends of the lower boom structure. ### Claim 11 (depends on 1) The boom assembly of claim 1 wherein the link is configured to move the counterweight downwardly along the lower boom structure when the lower boom structure is moved from the lowered position of the lower boom structure to the raised position of the lower boom structure. ### Claim 12 A vehicle comprising: a chassis; a support member rotatably mounted on the chassis; a lower boom structure mounted on the chassis so that the lower boom structure is pivotable between a lowered position of the lower boom structure and a raised position of the lower boom structure; an upper boom structure having a first end attached to the lower boom structure, and an opposite second end, and wherein the upper boom structure is pivotable relative to the lower boom structure between a lowered position and a raised position in which the second end is positioned above the lower boom structure; a counterweight movably mounted on the lower boom structure and translatable along the lower boom structure when at least a portion of the lower boom structure is moved relative to the upper boom structure; and a drive member having a first end connected to the counterweight and a second end connected directly to the support member; wherein the lower boom structure has a first end pivotally connected to the support member, and a second end pivotally connected to the first end of the upper boom structure, and wherein the counterweight is movable along the lower boom structure between the first and second ends of the lower boom structure. ### Claim 13 (depends on 12) The vehicle of claim 12 wherein the drive member comprises a link for moving the counterweight along the lower boom structure when the upper boom structure is pivoted between the lowered and raised positions. ### Claim 14 (depends on 12) The vehicle of claim 12 wherein the drive member is configured to translate the counterweight along the lower boom structure. ### Claim 15 (depends on 12) The vehicle of claim 12 wherein the drive member comprises a cylinder. ### Claim 16 (depends on 12) The vehicle of claim 12 further comprising a control unit associated with the drive member and configured to control operation of the drive member, based on position of one or both of the boom structures, in order to control position of the counterweight with respect to the lower boom structure. ### Claim 17 (depends on 12) The vehicle of claim 12 wherein the counterweight is translatable along the lower boom structure when the upper boom structure is pivoted with respect to the lower boom structure or when the lower boom structure is pivoted with respect to the upper boom structure. ### Claim 18 (depends on 12) The vehicle of claim 12 wherein the counterweight is translatable along the lower boom structure when a portion of the upper boom structure is moved between a retracted position and an extended position or when a portion of the lower boom structure is moved between a retracted position and an extended position. ### Claim 19 A boom assembly comprising: a base; a support member rotatably mounted on the base; a lower boom structure pivotally connected to the support member so that the lower boom structure is pivotable with respect to the support member and the base between a lowered position of the lower boom structure and a raised position of the lower boom structure; an upper boom structure connected to the lower boom structure and movable between a lowered position of the upper boom structure and a raised position of the upper boom structure; a counterweight movably mounted on the lower boom structure; and a link having a first end pivotably connected to the counterweight and a second end pivotally connected directly to the support member, wherein the link is configured to move the counterweight downwardly along the lower boom structure when the lower boom structure is moved from the lowered position of the lower boom structure to the raised position of the lower boom structure.