# US 2023/0053673 A1 · Trimmer head > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0053673 A1 - Document ID: US20230053673A1 - Status: Published application - Kind: A1 - Application number: 17/797,173 - Filed: 2020-05-15 - Published: 2023-02-23 - Earliest claimed: 2020-02-27 - Assignees: T&l CONSULTING AB - Applicants: T&l CONSULTING AB - Inventors: Bo Christer ANDREASSON - Web page: https://patentgrep.com/patent/US20230053673A1 ## CPC - A01D 34/82: Other details - A01D 34/416: Flexible line cutters - A01D 34/4167: {Protection devices} - A01D 34/81: Casings; Housings (A01D34/71 takes precedence) - A01D 34/828: {Safety devices} - A01D 43/077: with auxiliary means, e.g. fans, for transporting the mown crop - A01D: HARVESTING; MOWING ## Abstract The subject invention relates to a trimmer head for vegetation trimming and cutting machines, the trimmer head comprising a housing , a cutting blade , and a cutting blade shield with a plurality of through-openings , characterized in that it further comprises a vacuuming air assembly arranged in the housing such that, in operation, a vacuuming air flow is generated and directed from said cutting blade shield openings to an interior of the housing . The invention belongs to the field of apparatus for trimming and cutting grass, small bush wood, hedges, weed and reed. ## Claims ### Claim 1 A trimmer head comprising: a housing, a cutting blade, a cutting blade shield with a plurality of through-openings, wherein the trimmer head further comprises a vacuuming air assembly arranged in the housing such that, in operation, a vacuuming air flow is generated and directed from said cutting blade shield openingsto an interior of the housing. ### Claim 2 (depends on 1) The trimmer head according to claim 1, wherein the vacuuming air assembly comprises at least one vacuum air intakepointing to said through-openings such that, in operation, a vacuuming air flow is directed to the vacuum air intake. ### Claim 3 (depends on 1) The trimmer head according to claim 1, wherein the vacuuming air assembly comprises a vacuuming centrifugal fan arranged in air-connection with at least one of the cutting blade shield through-openings, such that, in operation, the centrifugal fan vacuums air through said, at least one, cutting blade shield through-openings. ### Claim 4 (depends on 3) The trimmer head according to claim 3, further comprising a vacuum air intake zone arranged in between the vacuum air intake and an air intake of the vacuuming centrifugal fan. ### Claim 5 (depends on 3) The trimmer head according to claim 3, wherein the vacuuming centrifugal fan comprises 8 to 20 fan wings, preferably 14 fan wings. ### Claim 6 (depends on 1) The trimmer head according to claim 1, wherein the cutting blade is a rotating blade comprising at least one knife that is angled in relation to a reference radial line. ### Claim 7 (depends on 6) The trimmer head according to claim 6, wherein at least one cutting blade knife of the rotating cutting blade is angled forwards in the rotational direction relative a reference radial line. ### Claim 8 (depends on 6) The trimmer head according to claim 6, wherein a total number of cutting blade knives and vacuuming fan wings is an odd number. ### Claim 9 (depends on 1) The trimmer head according to claim 1, further comprising a ground shield fixedly attached or detachably attached to the housing. ### Claim 10 (depends on 9) The trimmer head according to claim 9, wherein the housing is made of a plurality of parts and the ground shield is fixed to, or detachable from, at least one of said plurality of parts. ### Claim 11 (depends on 1) The trimmer head according to claim 1, wherein the cutting blade shield is attachable to and detachable from the housing. ### Claim 12 (depends on 1) The trimmer head according to claim 1, wherein the cutting blade shield comprises at least one solid part and at least one through-openings part. ### Claim 13 (depends on 1) The trimmer head according to claim 1, wherein each of the plurality of through-openings of the cutting blade shield has a width in the range of 4 to 12 mm. ### Claim 14 (depends on 1) The trimmer head according to claim 1, wherein clearances between parts are less than 5 mm. ### Claim 15 (depends on 2) The trimmer head according to claim 2, wherein an inner height of the cutting blade shield is about the same height of the vacuum air intake. ### Claim 16 (depends on 3) The trimmer head according to claim 3, wherein the vacuuming centrifugal fan comprises 14 of the fan wings. ### Claim 17 (depends on 7) The trimmer head according to claim 7 wherein the cutting blade comprises 2 to 6 of the knives. ### Claim 18 (depends on 7) The trimmer head according to claim 7 wherein the cutting blade comprises 5 of the knives. ### Claim 19 (depends on 12) The trimmer head according to claim 12, wherein the cutting blade shield comprises one of the solid parts arranged between two of the through-openings parts. ### Claim 20 (depends on 14) The trimmer head according to claim 14, wherein clearances between parts are in the range of 2 to 5 mm.