A hay sweep n, usu one of simple construction; see quots.
1890 Daily Herald (Grand Forks ND) [16 June 3]/5, [Advt:] 1 Straw Bucking pole. 1903 Breeder’s Gaz. 44.170 SD, The “bucking pole” is a favorite device in this section. In its simplest form it is a pole about six inches in diameter and from 15 to 20 feet long. Holes are bored through this pole at intervals of about one foot and smaller poles about two inches in diameter and eight or 10 feet long are inserted in the holes so that they extend an equal distance on either side of the main pole. The ends of these small poles are sharpened and they serve as “teeth” for the “bullrake,” or bucking pole, as it is called. 1904 Alta Advt. (IA) [5 Feb 8]/2 (newspaperarchive.com), [Advt:] Fanning mill, corn sheller, hay bucking pole, anvil and vice. 1917 Power Farming May 36 MT, Then we hitch two teams of two horses each on a bucking pole 14 feet long. . . This device is 3 feet high. The lower horizontal piece or sill is made of a 4×6 or 6×6 piece, 14 feet long[.] The top plate is a 2×6 of the same length. . . In using the bucking pole a load is hauled up to a portable hay stacker. 1921 Through Leaves 9.54 ceND (as of c1890), The bucking pole consisted of a timber about 4×8 inches and 16 to 18 ft. long. To each end of this a mule was hitched. When a pile of straw had accumulated . . the mules were driven one on either side of the pile so that the bucking pole, which had long teeth extending on either side, dragged the straw away from the machine. 1966 DARE (Qu. L16, . . Machines used . . in handling hay) Inf ND3, Bucking pole—two wheels, fork front, picks up windrows, stacks it in field. 1977 ND Hist. 44.4.30, I was too young to have to work, but I’d ride the bucking pole. . . They’d mow the hay and then they’d rake it up in bunches. Then they’d have a bucking pole with a team on each end. This bucking pole would be 20 feet or so long.