# US 7,743,841 B2 · Aeration device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,743,841 B2 - Document ID: US7743841B2 - Status: Granted - Kind: B2 - Application number: 12/208,784 - Filed: 2008-09-11 - Published: 2009-01-08 - Granted: 2010-06-29 - Earliest claimed: 2002-03-12 - Assignees: PlanetAir Turf Products, LLC - Inventors: David R. Maas; Scott W. Bjorge - Web page: https://patentgrep.com/patent/US7743841B2 ## CPC - A01B 45/026: {Scarifiers comprising a knife reel actively driven around a substantially horizontal shaft} - A01B: SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL (making or covering furrows or holes for sowing, planting or manuring A01C5/00; mowers convertible to soil working apparatus or capable of soil working A01D42/04; mowers combined with soil working implements A01D43/12; soil working for engineering purposes E01, E02, E21) ## Abstract A soil aeration device may include a plurality of arcuate blades mounted to an assembly adapted to rotate and translate the blades proximate a ground surface, thereby forming aeration pockets in the soil. In certain embodiments, the arcuate tines penetrate and fracture the soil while minimizing the amount of soil lifted from the pocket deposited on the top of the soil. In various embodiments, a planetary gear assembly imparts to the tine a translational and rotational movement which creates a fractured pocket in the soil while minimizing the amount of soil lifted from the pocket and deposited on the surface of the soil. In still other embodiments, the arcuate tine may have mounted thereon a coring tube that cuts and removes a plug from the pocket formed in the soil. ## Claims ### Claim 1 A method of aerating a soil surface, comprising: urging a plurality of aeration tines in a compound motion including a rotational motion about a first axis and an revolving motion about a second axis, each aeration tine including: a proximal portion that is substantially longitudinally straight and comprises an adapter to secure the tine to a tine holder member, and a curved blade portion extending distally from the proximal portion and including a concave blade edge at least partially defined by a first pair of transverse surfaces and an oppositely disposed convex blade edge at least partially defined by a second pair of transverse surfaces, the concave blade edge and the convex blade edge extending generally longitudinally toward a distal tip portion; penetrating a soil surface with the plurality of aeration tines to form aeration pockets in the soil surface, the curved blade portion of each aeration tine fracturing soil as it is urged in the compound motion. ### Claim 2 (depends on 1) The method of claim 1, wherein each tine forms a slit in the soil surface and a pocket under the soil surface without lifting substantial amounts of subterranean soil onto the soil surface. ### Claim 3 (depends on 2) The method of claim 2, wherein the slit has a first length and the pocket has a second length, said first length being smaller than said second length. ### Claim 4 (depends on 1) The method of claim 1, wherein the compound motion is imparted by a planetary gear assembly, the revolving motion being imparted by a revolving movement of a planet gear relative to a sun gear and the rotational motion being imparted by rotational movement of the planet gear about an axis of the planet gear. ### Claim 5 (depends on 1) The method of claim 1, wherein each aeration tine simultaneously removes a soil plug proximate the pocket. ### Claim 6 (depends on 1) The method of claim 1, wherein when the curved blade portion is urged in the compound motion through the soil surface, the convex blade edge moves through the soil and fractures the soil. ### Claim 7 (depends on 1) The method of claim 1, wherein the adapter of each aeration tine comprises a threaded cavity. ### Claim 8 (depends on 1) The method of claim 1, wherein the proximal portion of each aeration tine includes a substantially cylindrical portion that extends in a longitudinal direction. ### Claim 9 (depends on 8) The method of claim 8, wherein the substantially cylindrical portion has a lateral thickness that is substantially greater than a maximum lateral thickness of the curved blade portion. ### Claim 10 An aeration tine, comprising: a proximal portion including a threaded mounting cavity extending in a longitudinal direction to secure the proximal portion to a tine holder member, the proximal portion being substantially straight, and the proximal portion having a generally cylindrical exterior surface portion extending in the longitudinal direction; and a blade portion extending distally from the proximal portion, the blade portion being substantially curved and including a concave blade edge at least partially defined by a first pair of transverse surfaces and an oppositely disposed convex blade edge at least partially defined by a second pair of transverse surfaces, the concave blade edge and the convex blade edge extending generally longitudinally toward a distal tip portion so that, when the blade portion is urged in a compound motion through a ground surface, the curved blade portion fractures soil to form an aeration pocket. ### Claim 11 (depends on 10) The tine of claim 10, wherein the substantially cylindrical portion has a lateral thickness that is substantially greater than a maximum lateral thickness of the blade portion. ### Claim 12 (depends on 10) The tine of claim 10, wherein the blade portion has a thickness equal to or less than about 5/16 inch. ### Claim 13 (depends on 10) The tine of claim 10, wherein the blade portion has a thickness equal to or less than about ⅛ inch. ### Claim 14 (depends on 10) The tine of claim 10, wherein the convex blade edge leads the concave blade edge through the soil and fractures the soil when the blade portion is urged in the compound motion through the ground surface. ### Claim 15 (depends on 10) The tine of claim 10, wherein the blade portion is adapted to be urged in the compound motion through the ground surface, the compound motion including a rotational motion about a first axis and a revolving motion about a second axis. ### Claim 16 (depends on 10) The tine of claim 10, further comprising an aeration tube coupled to the curved blade portion at one of the convex edge or the concave edge, the aeration tube being operable to remove a soil plug as the curved member fractures soil and forms an aeration pocket. ### Claim 17 (depends on 16) The tine of claim 16, wherein the aeration tube is coupled to the curved blade portion at a location spaced apart from the distal tip portion.