# US 2014/0193231 A1 · Boom structure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0193231 A1 - Document ID: US20140193231A1 - Status: Published application - Kind: A1 - Application number: 14/239,501 - Filed: 2012-07-26 - Published: 2014-07-10 - Earliest claimed: 2011-08-19 - Assignees: Ponsse Oyj - Inventors: Vesa Yrjänä; Pentti Hukkanen; Jorma Hyvönen; Marko Halonen - Web page: https://patentgrep.com/patent/US20140193231A1 ## CPC - A01G 23/00: Forestry - B66C 23/42: with jibs of adjustable configuration, e.g. foldable - A01G: HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING (picking of fruits, vegetables, hops or the like A01D46/00; propagating unicellular algae C12N1/12) - 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 structure on a work machine includes at least two boom branches and a main boom structure extending from their convergence area substantially in a working direction. Thus, the boom structure provides a fork-like structure. ## Claims ### Claim at position 1 1-11. (canceled) ### Claim 12 A boom structure on a work machine, the work machine comprising a cabin and a boom structure, the boom structure is a branched boom structure that comprises at least two boom branches arranged on the work machine and a main boom structure extending from their convergence area substantially in a working direction, wherein the boom structure is rotatable in relation to the frame of the work machine about a substantially vertical axis, the boom branches are arranged on the work machine substantially in the vicinity of planes formed by side walls of the cabin, and the boom branches are arranged to extend at least partly to the area of the side walls of the cabin in at least one use or transport position of the work machine. ### Claim 13 (depends on 12) The boom structure of claim 12, wherein the boom branches are arranged substantially symmetrically to a centre line and a vertical centre line of the cabin. ### Claim 14 (depends on 12) The boom structure of claim 12, wherein the cabin is rotatable at least partly about its vertical axis and the boom structure is arranged in connection with the cabin such that the boom structure rotates in a synchronized manner with the cabin such that the centre line of the cabin and the direction of the main boom structure remain substantially parallel. ### Claim 15 (depends on 12) The boom structure of claim 12, wherein the boom structure is turnable in relation to an axis perpendicular to the working direction. ### Claim 16 (depends on 15) The boom structure of claim 15, wherein the axis perpendicular to the working direction is arranged in the work machine to be behind the vertical centre line of the cabin. ### Claim 17 (depends on 15) The boom structure of claim 15, wherein the boom structure comprises at least one actuator for rotating the boom structure in relation to axis. ### Claim 18 (depends on 16) The boom structure of claim 16, wherein the boom structure comprises at least one actuator for rotating the boom structure in relation to axis. ### Claim 19 (depends on 12) The boom structure of claim 12, wherein the boom branches and at least part of the main boom structure constitute a substantially continuous structure in such a manner that said parts are not substantially movable in relation to one another. ### Claim 20 (depends on 12) The boom structure of claim 12, wherein each boom branch comprises a part substantially parallel with the main direction of the main boom structure and a part at an angle thereto and orienting substantially towards the frame. ### Claim 21 (depends on 20) The boom structure of claim 20, wherein in the boom branches between said part substantially parallel with the main direction of the main boom structure and said part orienting substantially towards the frame there is formed an angle of about 70 to 110 degrees. ### Claim 22 (depends on 12) The boom structure of claim 12, wherein the boom structure comprises at least one folding link which enables turning of the first part of the boom structure, which comprises at least the main boom structure, in relation to the second part of the boom structure, which comprises at least part of the boom branches, and an actuator for controlling the folding link. ### Claim 23 (depends on 13) The boom structure of claim 13, wherein the boom structure comprises at least one folding link which enables turning of the first part of the boom structure, which comprises at least the main boom structure, in relation to the second part of the boom structure, which comprises at least part of the boom branches, and an actuator for controlling the folding link. ### Claim 24 (depends on 14) The boom structure of claim 14, wherein the boom structure comprises at least one folding link which enables turning of the first part of the boom structure, which comprises at least the main boom structure, in relation to the second part of the boom structure, which comprises at least part of the boom branches, and an actuator for controlling the folding link. ### Claim 25 (depends on 15) The boom structure of claim 15, wherein the boom structure comprises at least one folding link which enables turning of the first part of the boom structure, which comprises at least the main boom structure, in relation to the second part of the boom structure, which comprises at least part of the boom branches, and an actuator for controlling the folding link. ### Claim 26 (depends on 12) The boom structure of claim 12, wherein the work machine is a forest work unit. ### Claim 27 (depends on 13) The boom structure of claim 13, wherein the work machine is a forest work unit. ### Claim 28 (depends on 14) The boom structure of claim 14, wherein the work machine is a forest work unit. ### Claim 29 (depends on 15) The boom structure of claim 15, wherein the work machine is a forest work unit. ### Claim 30 (depends on 19) The boom structure of claim 19, wherein the work machine is a forest work unit. ### Claim 31 (depends on 20) The boom structure of claim 20, wherein the work machine is a forest work unit.