# US 2016/0257541 A1 · Lift arrangement of a lift truck with mast damping devices and lift truck > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2016/0257541 A1 - Document ID: US20160257541A1 - Status: Published application - Kind: A1 - Application number: 14/636,692 - Filed: 2015-03-03 - Published: 2016-09-08 - Earliest claimed: 2015-03-03 - Assignees: Jungheinrich Aktiengesellschaft - Applicants: Jungheinrich Aktiengesellschaft - Inventors: Kelvin Chan; John Recchia - Web page: https://patentgrep.com/patent/US20160257541A1 ## CPC - B66F 9/08: Masts; Guides; Chains - B66F 9/07: Floor-to-roof stacking devices, e.g. "stacker cranes", "retrievers" - F16F 3/0873: {of the same material or the material not being specified} - 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) - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION ## Abstract A lift arrangement of a lift truck, especially a forklift truck, has a lift mast defining a z-axis. The lift mast includes a first mast section and a second mast section. Damping elements made from elastic material are provided on the first mast section and/or the second mast section preventing a hard impact of the second mast section with the first mast section at the run-in end position of the second mast section. The damping elements are configured and arranged in such a manner that, in addition to damping the movement of the second mast section in the direction of the z-axis, the damping elements damp movements of the second mast section in the directions of the x-axis and the y-axis running perpendicularly to the z-axis. ## Claims ### Claim 1 A lift arrangement of a lift truck, the lift arrangement comprising: a lift mast defining an imaginary x-y-z coordinate system and having a first mast section and a second mast section movable relative to said first mast section along the z-axis of said coordinate system; said lift mast further defining a run-in end position of said second mast section; said first and second mast sections conjointly defining an interface at said run-in end position; a damping assembly made of elastic material provided at at least one of said first mast section and said second mast section and configured to prevent a hard impact between said first mast section and said second mast section at said run-in end position of said second mast section by dampening the movement of said second mast section along said z-axis; and, said damping assembly including damping units made of said elastic material and being configured and mounted at said interface so as to also dampen movements of said second mast section along both the x-axis and the y-axis of said coordinate system running perpendicularly to said z-axis. ### Claim 2 (depends on 1) The lift arrangement of claim 1, wherein: said second mast section has a first side and a second side; and, said damping units are formed by a first damping element configured to contact said first side of said second mast section and a second damping element configured to contact said second side of said second mast section. ### Claim 3 (depends on 2) The lift arrangement of claim 2, wherein said damping elements are wedge-shaped. ### Claim 4 (depends on 2) The lift arrangement of claim 2, wherein: said first mast section has a first and a second step-shaped extension; said first damping element is arranged on said first step-shaped extension; and, said second damping element is arranged on said second step-shaped extension. ### Claim 5 (depends on 2) The lift arrangement of claim 2, wherein said second mast section and said damping elements each have respective contact surfaces running parallel to each other. ### Claim 6 (depends on 2) The lift arrangement of claim 2, wherein: said first and said second damping elements have planar or curved contact surfaces, respectively; and, said contact surfaces are configured to dampen movements of said second mast section in the directions of the x-axis, y-axis and z-axis of said imaginary x-y-z coordinate system. ### Claim 7 (depends on 6) The lift arrangement of claim 6, wherein: said first and said second damping elements each have a base surface, a rear surface running perpendicular to said base surface thereof and said contact surface for said second mast section; and, the contact surface of each of said damping elements defines an angle with the base surface (xy plane) thereof which departs from 90 degrees in the direction of the x-axis as well as in the direction of the y-axis. ### Claim 8 (depends on 7) The lift arrangement of claim 7, wherein each of said first and second damping elements is fixed on said first mast section via the base surface and rear surface thereof. ### Claim 9 A lift truck comprising: a lift arrangement including a lift mast defining an imaginary x-y-z coordinate system and having a first mast section and a second mast section movable relative to said first mast section along the z-axis of said coordinate system; said lift mast further defining a run-in end position of said second mast section; said first and second mast sections conjointly defining an interface at said run-in end position; a damping assembly made of elastic material provided at at least one of said first mast section and said second mast section and configured to prevent a hard impact between said first mast section and said second mast section at said run-in end position of said second mast section by dampening the movement of said second mast section along said z-axis; and, said damping assembly including damping units made of said elastic material and being configured and mounted at said interface so as to also dampen movements of said second mast section along both the x-axis and the y-axis of said coordinate system running perpendicularly to said z-axis. ### Claim 10 (depends on 9) The lift truck of claim 9, wherein said lift truck is a forklift truck.